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1
Opperman, Adriaan Jacobus. "Analysis of factors influencing the performance of a hydrokinetic coil pump." Thesis, Nelson Mandela Metropolitan University, 2013. http://hdl.handle.net/10948/d1021041.
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A hydrokinetic coil pump (HCP) is described by its name. It is a coil pump driven by the kinetic energy in flowing water. The hydrokinetic energy is converted into mechanical energy by means of a paddle-wheel. The coil pump makes up part of the paddle-wheel and together is called a HCP. The HCP floats in a stream of flowing water while tethered to the bank. The focus of the study was to identify and analyse the factors influencing the HCP. The HCP was then optimized for rural application. Data acquisition took place through experimentation on a full scale experimental platform according to a central composite experimental design. Variables used for the experimentation included; Stream Velocity, Delivery Head, Number of Coils, Discharge, Number of Paddles, Paddle-Wheel rotational speed Overall HCP efficiencies of up to 22 percent were obtained. The efficiency would drop as the stream velocity increased. Stream velocity has been identified as the most influential factor with regards to the variables analysed by this study. The HCP is ideal for rural application. The simplicity of the design ensures reliability as well as an effective water supply solution. The HCP is ideal for slow flowing rivers and can deliver up to 1190ℓ/h to a delivery head of 5m with a stream velocity of 1.2m/s. This is sufficient to supply a small rural community with running water.
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Mainland, Marlene Elise. "Analytical and experimental investigation of an efficient viscous pump." Thesis, Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/15832.
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Kalim, Azfar. "Utilization of the geared five-bar slider-crank mechanism for positive displacement machines." Thesis, University of Ballarat, 2010. http://researchonline.federation.edu.au/vital/access/HandleResolver/1959.17/41995.
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The conventional slider-crank mechanism which is often employed to drive reciprocating positive displacement machines is not adequate when it is necessary to produce non-uniform reciprocations in order to improve machine performance. Instead, this thesis dicusses the utilisation of the geared five-bar slider-crank mechanism to drive these machines." -- Introduction.<br>Doctor of Philosphy
4
Liu, Guang. "A photovoltaic-powered pumping system." Thesis, University of British Columbia, 1989. http://hdl.handle.net/2429/30592.
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This thesis studies the optimal design for a photovoltaic-powered medium-head (30 meters) water pumping system, with the emphasis on improving the efficiency and reducing the maintenance requirements of the electrical subsystem. The reduction of maintenance requirements is realized by replacing the conventional brush-type permanent magnet dc motor with a brushless dc (BLDC) motor. Different BLDC motor control techniques such as position-sensorless operation, sinusoidal and trapezoidal excitations are investigated. The improvement in efficiency is achieved by maximizing the output power from the photovoltaic array and by minimizing the losses in various parts of the electrical sub-system. A microprocessor-based double-loop maximum power tracking scheme is developed for maximization of the photovoltaic array output power. Over 99% utilization factor is achieved for a typical clear day regardless of the season of the year. The system losses are minimized mainly by performing loss analysis and selecting most suitable switching topologies and switching components. Experimental results show that the combined converter-motor efficiency is comparable to those of high-efficiency brush-type dc motor systems.<br>Applied Science, Faculty of<br>Electrical and Computer Engineering, Department of<br>Graduate
5
Brown, Daniel F. Jr. "Single crystal piezoelectric pumping using displacement amplification." Thesis, Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/19124.
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Wilkes, Kevin Wood. "Rotordynamic analysis of circumferentially grooved annular pump seals with turbulent flow and inlet swirl /." This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-12302008-063353/.
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Dean, Patrick T. "Modern control design for a variable displacement hydraulic pump." Diss., Columbia, Mo. : University of Missouri-Columbia, 2006. http://hdl.handle.net/10355/4647.
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Thesis (M.S.)--University of Missouri-Columbia, 2006.<br>The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on April 21, 2009) Includes bibliographical references.
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Shellenberger, Michael J. C. "Design considerations for variable power split hydraulic drives for industrial applications." Morgantown, W. Va. : [West Virginia University Libraries], 1999. http://etd.wvu.edu/templates/showETD.cfm?recnum=655.
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Thesis (M.S.)--West Virginia University, 1999.<br>Title from document title page. Document formatted into pages; contains x, 91 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 68-69).
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Wong, Yuen-wah, and 黃婉華. "Performance prediction model for a solar water pump." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2000. http://hub.hku.hk/bib/B31223722.
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Iamonaco, Mark A. "Determination of impeller pumping capacity from laser doppler anemometer (LDA) measurements in an agitated vessel /." Online version of thesis, 1991. http://hdl.handle.net/1850/11005.
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Cohen, Ed (Edward I. ). "Navy positive displacement pump standardization study /." This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-03302010-020439/.
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Wong, Yuen-wah. "Performance prediction model for a solar water pump /." Hong Kong : University of Hong Kong, 2000. http://sunzi.lib.hku.hk/hkuto/record.jsp?B21607424.
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Cho, Junhee. "Dynamic modeling and analysis for swash-plate type axial pump control utilizing indexing valve plate /." free to MU campus, to others for purchase, 2000. http://wwwlib.umi.com/cr/mo/fullcit?p9974614.
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Alzuhd, Tahir Hussein Hasan. "Pressure losses associated with slurry flow in horizontal pipelines." Thesis, University of Hertfordshire, 2003. http://hdl.handle.net/2299/14146.
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The flow of solid liquid mixtures (slurries) has attracted much attention in research work because of its importance to industry. Prediction of pressure losses associated with slurry flow helps pipe designers select the correct pipe sizes for optimum energy consumption, equipment sizing and reliable operation of the pipeline networks. Many workers developed empirical correlations, but due to the randomness of the problem they seem of limited use in design applications because they do not contain an assessment except by trial and error, which is costly. The existence of more than one particle size poses more complexities to the slurry flow problem but it is in need in practical applications. The aims of this work are justified under the light of the observations on the state of the art in slurry transport. An experimental program is designed to highlight the effects of this problem through a predetermined set of test runs. The variables are grouped to optimise the number of experiments and to remove the effect of dimensions on the prediction method The test rig is built to serve the aims of this exercise and test runs conducted, results grouped and discussed for polyfractional slurries. A mathematical model is developed in the form of an empirical correlation. Statistical tests are employed to verify the goodness of fit. Finally, conclusions and recommendations for further work are listed.
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Frith, Robert Hedley. "A model of gear pump wear due to solids contamination." Thesis, Queensland University of Technology, 1994.
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Badr, Elie Antoine. "Estimation of residual stresses induced by autofrettage with an experimental evaluation of the autofrettage process in crossbores of positive displacement pumps /." Access abstract and link to full text, 1994. http://0-wwwlib.umi.com.library.utulsa.edu/dissertations/fullcit/9500703.
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Sachdeva, Rajesh. "Two-phase flow through electric submersible pumps /." Access abstract and link to full text, 1988. http://0-wwwlib.umi.com.library.utulsa.edu/dissertations/fullcit/9021070.
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Granich, William Anthony. "A renewable energy feasibility study to power a water supply pump in Sacala las Lomas, Guatemala." Diss., Rolla, Mo. : Missouri University of Science and Technology, 2009. http://scholarsmine.mst.edu/thesis/pdf/Granich_09007dcc80665b6f.pdf.
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Thesis (M.S.)--Missouri University of Science and Technology, 2009.<br>Vita. The entire thesis text is included in file. Appendices A-G included in PDF, not on CD-ROM. Title from title screen of thesis/dissertation PDF file (viewed May 20, 2009) Includes bibliographical references.
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Dawson-Amoah, James. "Gas-liquid mass transfer rates by gas pumping : agitators in oxygen pressure leaching systems." Thesis, University of British Columbia, 1991. http://hdl.handle.net/2429/29931.
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Recent developments have indicated high oxygen consumption rates of about 35 g-mole/m³-min during oxidative pressure leaching. At such high oxygen consumption rates the mass transfer of dissolved oxygen at the gas-liquid interface may become rate-limiting. The objective of this study was to obtain an understanding of the gas-liquid mass transfer processes that take place in mechanically agitated pressure leaching systems. The classical reaction between sodium sulphite and dissolved oxygen to form sulphate at atmospheric pressure was used to determine the oxygen mass transfer rates in a 200-liter asymmetrical plastic tank, modelled after the shape of the first compartment of the zinc pressure leach.
The effect of this asymmetry was compared with the work of Swiniarski who used a cylindrical symmetrical tank of similar volume. A number of process variables such as the impeller type and size, the impeller speed, the impeller immersion depth and the effect of full baffles that affect mixing were investigated. Also, the volumetric power consumption associated with the mass transfer rates were measured.
The results indicate that the asymmetrical tank is at least 3.6 times more efficient in mass transfer than the symmetrical tank. There is a critical speed below which the mass transfer parameter, K[formula omitted], is almost zero and above which K[formula omitted] increases almost linearly with impeller tip speed. A simple energy balance model for bubble creation can predict the critical tip speed. It is shown that K[formula omitted] is enhanced at shallow depths, with a corresponding high mass transfer to energy ratio. The relative effectiveness of impeller types and sizes with regard to the use of power for gas-liquid mass transfer was established. Full baffles degrade the mass transfer rate at increased depth of impeller immersion.
The results also add substantial support to the findings provided by DeGraaf [5] that: (i) The dimensionless correlations used in liquid mixing systems do not accurately predict dispersion rates by agitators. (ii) The optimum conditions for gas dispersion and the consequent generation of gas-liquid interfacial area are different from fluid mixing. (iii) The classical mixing power equations for impellers markedly overestimate power requirements during impeller gas dispersion.<br>Applied Science, Faculty of<br>Materials Engineering, Department of<br>Graduate
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Wilkes, Kevin. "Rotordynamic analysis of circumferentially grooved annular pump seals with turbulent flow and inlet swirl." Thesis, Virginia Tech, 1991. http://hdl.handle.net/10919/46444.
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In this thesis an analysis is developed to predict the leakage and dynamic characteristics for circumferentially grooved turbulent annular seals used in turbopumps. The flow in the groove is modelled using turbulent shear layer theory and an entrance loss model is applied at the inlet and land regions of the seal. The governing equations are derived using Hirs’ turbulent lubrication theory. The equations are expanded to yield zeroth and first order perturbation equations for small rotor displacements about a centered position. The leakage and velocity distribution is obtained from a numerical solution of the zeroth order equations. The first order equations define the dynamic pressure distribution which is integrated to yield the fluid force reactions. The model predictions are compared to test results for smooth walled and grooved seals. The model shows good qualitative agreement with experimental test results for seal leakage and rotordynamic coefficients. Actual quantitative agreement is unresolved given the high level of experimental uncertainty in the test results.<br>Master of Science
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Côté, Germain. "Systèmes de pompage à haut-rendement pour l'industrie des pâtes et papiers /." Thèse, Chicoutimi : Université du Québec à Chicoutimi, 1995. http://theses.uqac.ca.
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Kleynhans, S. H. "Physcial hydraulic model investigation of critical submergence for raised pump intakes." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/20304.
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Thesis (MScEng)--Stellenbosch University, 2012.<br>ENGLISH ABSTRACT: Various design guidelines have been published over the past four decades to calculate the minimum submergence required at pump intakes to prevent vortex formation. These design guidelines also require the suction bell to be located not higher than 0.5 times the suction bell diameter (D) above the floor. Sand trap canals are an integral part of large river abstraction works, with the pump intakes located at the end of the sand trap canals. The canals need to be flushed by opening a gate, typically 1.5 m high, that is located downstream of the pump intake. This requires the suction bell be raised to not interfere with the flushing operation, which leads to the question – what impact does the raising of the suction bell have on the minimum required submergence? A physical hydraulic model constructed at 1:10 scale was used to determine the submergence required to prevent types 2, 5 and 6 vortices for prototype suction bell inlet velocities ranging from 0.9 m/s to 2.4 m/s, and for suction bells located at 0.5D, 1.0D and 1.5D above the floor. The tests were undertaken for four suction bell configurations with a conventional flat bottom suction bell, fitted with a long radius bend, being the preferred suction bell configuration in terms of the lowest required submergence levels. The experimental test results of the preferred suction bell configuration were compared against the published design guidelines to determine which published formula best represents the experimental test results for raised pump intakes. It became evident from the experimental test results that the required submergence increased markedly when the suction bell was raised higher than a certain level above the floor. It was concluded that this “discontinuity” in the required submergence occurred for all the suction bell configuration types when the ratio between the prototype bell inlet velocity and the approach canal velocity was approximately 6.0 or higher. It is recommended that, for pump intakes with a similar geometry to that tested with the physical hydraulic model, critical submergence is calculated using the equation published by Knauss (1987), i.e. S = D(0.5 + 2.0Fr), if the prototype bell inlet velocity/approach canal velocity ratio is less than 6.0, and that the equation published by the Hydraulic Institute (1998), i.e. S = D(1 + 2.3Fr), can be used where the ratio, as determined with Knauss’ (1987) equation, exceeds 6.0. It is also recommended that prototype bell inlet velocities be limited to 1.5 m/s.<br>AFRIKAANSE OPSOMMING: Oor die afgelope vier dekades is verskeie ontwerpriglyne vir die berekening van minimum watervlakke, om werwelvorming by pompinlate te voorkom, gepubliseer. Hierdie ontwerpriglyne vereis dat die klokmond van die pompinlaat nie hoër as 0.5 keer die deursnee van die klokmond (D) bokant die kanaalvloer geleë moet wees nie. Sandvang kanale vorm ‘n integrale deel van groot riveronttrekkingswerke, met pompinlate wat aan die einde van hierdie kanale geleë is. Die kanale word aan die stroomaf kant van die pompinlaat voorsien met sluise sodat die kanale gespoel kan word. Hierdie sluise is tipies 1.5 m hoog. Dit is derhalwe nodig om die hoogte onder die klokmond dieselfde te maak as die hoogte van die sluis sodat die klokmond die spoelwerking nie beïnvloed nie. Die vraag is egter – wat is die impak op die minimum vereiste watervlakke indien die klokmond op ‘n hoër vlak installeer word? ‘n Fisiese hidrouliese model met ‘n 1:10 skaal is gebruik om die minimum watervlakke te bepaal waar tipes 2, 5 en 6 werwels aangetref word vir prototipe inlaatsnelhede van 0.9 m/s tot 2.4 m/s en klokmond hoogtes van 0.5D, 1.0D en 1.5D bokant die kanaalvloer. Vier klokmond konfigurasies is getoets. Die minimum vereiste watervlakke was die laagste vir die tradisionele plat klokmond met ‘n lang radius buigstuk en was dus die voorkeur klokmond. Die eksperimenttoetsresultate vir die voorkeur klokmond is met die gepubliseerde ontwerpriglyne vergelyk om te bepaal watter van die ontwerpsriglyne van toepassing sal wees vir verhoogde klokmond installasies. Uit die eksperimenttoetsresultate is dit duidelik dat die vereiste watervlakke skielik verhoog sodra die klokmond installasie ‘n seker hoogte bokant die kanaal vloer oorskry. Daar is bevind dat hierdie verskynsel by al vier klokmond konfigurasies voorkom sodra die verhouding tussen die prototipe klokmond inlaatsnelheid teenoor die snelheid in die kanaal hoër as 6.0 is. Daar word aanbeveel dat die minimum vereiste watervlak vir pompinlate met dieselfde geometrie as die fisiese model, met Knauss (1987) se vergelyking bereken word, naamlik S = D(0.5 + 2.0Fr), waar die snelheidsverhouding tussen die klokmond en kanaal 6.0 nie oorskry nie, en dat die vergelyking gepubliseer deur die Hydraulic Institute (1998), S = D(1 + 2.3Fr), gebruik word waar die snelheidsverhouding 6.0, so bereken met Knauss (1987) ser vergelyking, wel oorskry. Die prototipe klokmond inlaatsnelheid moet ook beperk word tot 1.5 m/s.
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Lemmer, Edward Charles. "Wind-electric pump system design." Thesis, Stellenbosch : University of Stellenbosch, 2009. http://hdl.handle.net/10019.1/2527.
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Thesis (MScEng (Electrical and Electronic Engineering))--University of Stellenbosch, 2009.<br>The aim of this study is to analyse the operation of a wind-electric pumping system (WEPS) as an alternative to conventional mechanical wind pumps for application in stand-alone water-pumping schemes. The steady-state as well as the dynamic operation of such a system is analysed. Through these analyses, practical guidelines are given in the design and sizing of the different system components to ensure efficient and reliable operation. Theoretical analyses are supported by measured results conducted on a small scale wind-electric pump system. The limitations involved in the design and implementation of a large scale wind-electric pump system are presented through a case study. It is firstly concluded that small-scale wind-electric pump systems have the potential of offering superior performance and flexibility to conventional mechanical wind pumps. It is secondly concluded that large-scale wind-electric pump systems are best suited, in terms of economic and practical feasibility, to pumping applications with low pressures and medium to high wind regimes at the turbine installation site.
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Davies, Neale. "Novel, induced flow, centrifugal water pumping system for off grid application." Thesis, University of Liverpool, 2015. http://livrepository.liverpool.ac.uk/2037461/.
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Water provision in rural areas represents a significant challenge, especially within the context of resource and sanitation in developing countries. High set-up costs, lack of installation expertise and reliability issues, arising from fluctuating operational conditions, have prevented many people from receiving the full benefit of automated pumping systems. The specific aim of this thesis is to assess the feasibility of using a tunable, induced flow subsystem as a means of optimising the power utilization and performance of a centrifugal pump over a wider range of operating conditions than typically expected. More generally, the research presented is undertaken to reduce the high implementation costs and localised limitations of rural water pumps by developing the theory towards a ‘’one-size-fits-all’’ pumping system. The theoretical analysis of an induced flow centrifugal pumping system is presented, coupled with the analogous electrical system. The results of simulations performed using both systems are compared to experimental results, obtained using an induced flow subsystem (IFS) test rig constructed at the University of Liverpool. All sets of results demonstrate consistent IFS characteristics, identifying its capability to maintain maximum power point (MPP) operation of the centrifugal pump irrespective of load. Further, the experimental results reveal a boost in output pressure which enables the pump to achieve an improved hydraulic power and increased operating range over the same system without an IFS. It is concluded that, through the addition of an IFS, the performance of a centrifugal pump may be decoupled from its operating head, expanding its range of serviceable conditions and demonstrating potential to develop a ‘’one-size-fits-all’’ system. Ultimately, this could offer a cheaper and more reliable supply of a resource which is vital to life in any rural location: clean water.
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Kang, Jane. "Pump design for a portable renal replacement system." Thesis, Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/39570.
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Most patients diagnosed with End Stage Renal Disease (ESRD) undergo hemodialysis. Traditional hemodialysis treatment requires patients spending three to five hours every other day while yielding the high waste level accumulated between treatments. These limitations in the current technology have spurred the development of a portable renal replacement system. The portable system will not only free the patients from visiting the clinic but also allow more frequent treatment that will lead to lower average waste level. To realize a portable system, the size and weight of hemodialysis system components should be reduced. This work analyzes the working principle of the pump and proposes a DC-motor and cam driven finger pump design. In addition, an analytical pump model is created for the optimization of the pump design. In vitro experiment conducted using the pump measured Creatinine levels over time, and the results validitate the design for the portable renal replacement system. The proposed pump design is smaller than 188 cm³ and consumes less than 4W while providing a flow rate of more than 100ml/min (the optimum flow rate for a portable system) for both blood and dialysate flows. The smallest pump of a portable renal replacement system in the literature uses check valves, which considerably increase the overall manufacturing cost and possibility of clogging. Compared to that pump, the proposed pump design achieved reduction in size by 40% and savings in energy consumption by 65% with the removal of valves. This simple and reliable design substantially enables development of a portable renal replacement system.
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Roberge, Jennifer Anne. "Use of Computational Fluid Dynamics (CFD) to Model Flow at Pump Intakes." Digital WPI, 1999. https://digitalcommons.wpi.edu/etd-theses/1046.
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"This thesis presents a series of physical experiments and numerical simulations intended to determine whether the use of commercially available computational fluid dynamics (CFD) software may provide a viable alternative to the use of physical models for predicting the occurrence of vortices and swirl in pump intakes. The physical experiments were set up at Alden Research Laboratories, Inc. (ARL) of Holden, Massachusetts, using a simple pump intake model donated by ARL for use in this study. Swirl and velocity measurements and dye injections were used to characterize the flow in the physical model. Three flow conditions were chosen for the physical experiments because they demonstrated swirl and vortices developing at the pump intake. Once the physical experiments were performed, FIDAP, a general-purpose finite-element CFD package, was used to simulate the circulation patterns in the vicinity of a pump intake. The model configuration and scale were selected to simulate experimental conditions in the physical pump intake model. Some similarities were also identified in the locations of the models predicted vortex characteristics and the vortex characteristics that were observed in the experimental facility. However, the characteristics of swirl within the pump intake differed from experimental observations. Therefore, additional simulations were conducted to analyze the sensitivity of simulations to model assumptions. These additional simulations showed that the assumptions related to these model parameters have minor affects on the general nature of the predicted vortices, but do affect the predicted vortex strength. This thesis represents a first step in addressing the discrepancies between numerical and experimental results. Additional investigations are recommended to clarify the applicability of CFD to address pump intake problems."
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Ribeiro, Lubienska Cristina Lucas Jaquiê 1977. "Modelo hibrido para o estabelecimento de rotações otimas de bombas de rotação variavel." [s.n.], 2002. http://repositorio.unicamp.br/jspui/handle/REPOSIP/258325.
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Orientadores: Edevar Luvizotto Junior, Renato Soliani<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Civil<br>Made available in DSpace on 2018-08-02T00:09:29Z (GMT). No. of bitstreams: 0
Previous issue date: 2002<br>Resumo: As simulações computacionais são, na atualidade, ferramentas integrantes do processo de análise de instalações hidráulicas a condutos forçados. O presente trabalho apresenta o desenvolvimento de um modelo computacional, para a simulação, em período extensivo, de sistemas de abastecimento de água contendo bombas de rotação variável, visando o estabelecimento das velocidades ótimas de rotação que satisfaçam objetivos pré-estabelecidos, no caso, a manutenção de pressões mínimas de serviço e a redução de consumo de energia elétrica e o retomo de nível ao final do período à condições desejadas. Em técnicas convencionais as funções objetivos estabelecidas estão sujeita a um conjunto de restrições implícitas e explicitas dos elementos do sistema, algumas fortemente não lineares, por isso a opção da solução através de um modelo híbrido (simulador-otimizador). Usando os Algoritmos Genéticos como "gerador e controlador" das variáveis de decisão (modelo de otimização) em conjunto com modelo hidráulico de simulação de operação da rede hidráulica. Os exemplos avaliados mostraram o potencial da técnica proposta para diversas condições operacionais objetivadas, mostrando que o uso da ferramenta para demais situações operacionais se dá apenas pela mudança da função objetivo e não nos módulos principais da simulador e otimizador. Assim, topologias e situações operacionais podem ser alteradas sem a modificação dos módulos principais<br>Abstract: Computational simulations are, nowadays, tools that are present in the analysis process of hydraulic networks. The present dissertation brings the development of a computational model, to simulate, in extensive period, water supply systems operating with variable pumps speed, aiming at the optimum speeds of rotation that satisfy pre determined purposes, in this case, the maintenance of minimum pressure service, the reduction of the electric power and the return of the level to the wanted conditions of the period. In conventional techniques the established objective function is subjected a set of implicit and explicit restriction of the system elements, . some strongly non-linear, then, the option of solution by hybrid model (simulation-optimization). Using the genetic algorithms as "generator and controller" of decision variables (optimization model) with the hydraulic model for operational simulation of water distribution network<br>Mestrado<br>Recursos Hidricos<br>Mestre em Engenharia Civil
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Wang, Longke. "Adaptive control of variable displacement pumps." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/43654.
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Fluid power technology has been widely used in industrial practice; however, its energy efficiency became a big concern in the recent years. Much progress has been made to improve fluid power energy efficiency from many aspects. Among these approaches, using a valve-less system to replace a traditional valve-controlled system showed eminent energy reduction. This thesis studies the valve-less solution-pump displacement controlled actuators- from the view of controls background.
Singular perturbations have been applied to the fluid power to account for fluid stiffness; and a novel hydraulic circuit for single rod cylinder has been presented to increase the hydraulic circuit stabilities. Recursive Least Squares has been applied to account for measurement noise thus the parameters have fast convergence rate, square root algorithm has further applied to increase the controller's numerical stability and efficiency. It was showed that this technique is consistent with other techniques to increase controller's robustness. The developed algorithm is further extended to a hybrid adaptive control scheme to achieve desired trajectory tracking for general cases.
A hardware test-bed using the invented hydraulic circuit was built up. The experimental results are presents and validated the proposed algorithms and the circuit itself. The end goal of this project is to develop control algorithms and hydraulic circuit suitable for industrial practice.
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Fuhnwi, Godwin Fonguh. "Computational modelling of a smart impeller actuated by shape memory alloys." Thesis, Cape Peninsula University of Technology, 2011. http://hdl.handle.net/20.500.11838/1288.
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Thesis (MTech (Mechanical Engineering))--Cape Peninsula University of Technology, 2011<br>Smart (SMA-Shape Memory Alloy) Technology continues to advance rapidly
as engineers move closer to and understand better the industrial and
commercial needs for SMA. As a matter of fact, all types of products, which
exercise some type of control over their function, are rapidly making their way
into the marketplace [36] Nonetheless, nowhere has been evidence in the
development of a SMA impeller.
Unlike traditional impellers with no control over their function and sometimes
fixed angle of attack, this paper demonstrates numerical investigations using
analytical algorithms (Matrix laboratory programming and excel spread sheet)
and advanced computer simulation package, Engineering Fluid dynamics
(EFD) into the feasibility of using a smart impeller to study the performance of
a pumping system and the best angle of attack for a Shape Memory Impeller.
Primarily, Bench mark data and dimensions are obtained from a standard
centrifugal pump run on a FM21 demonstration unit. Using the same standard
centrifugal pump, and keeping all other dimensions the same but altering the
angle of attack, EFD simulations where made.
From analytical algorithm and EFD comparison, it was evident that the best
angle of attack is 12 degree at the outlet angle with respect to the inlet angle.
From EFD results, it is palpable that, by increasing the angle of attack from 35
degree to 45 degree at the outlet there will be huge increase in flow rate by
63.47%
There is also a slight decrease in the impeller Torque from 35 degrees to 42
degrees by 0.72%.
It is economically feasible to work at an outlet angle of 42 degrees due to
increase in efficiency of 62.1% and a drop in torque of 0.72% by varying the
outlet angle from 35 degrees to 42 degree.
Understanding how critical actuator design is, it should be suggested that any
shape memory impeller should never be used in critical components without a
prior history of thermal and mechanical loading.
Therefore, a NiTi impeller constitutive model can be designed, with impeller
blades made from NiTi plates, trained to remember its best angle of attack
(Martensitic phase). NiTi shape memory metal alloy (plates-blades) can exist
in a two different temperature-dependent crystal structures (phases) called
martensite [9](lower temperature-normal pumping condition) and austenite [9]
(higher temperature or parent phase-trained best angle of attack.)
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Edwards, John Mason. "Microfluidic Electro-osmotic Flow Pumps." Diss., CLICK HERE for online access, 2007. http://contentdm.lib.byu.edu/ETD/image/etd2145.pdf.
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Park, Kibin. "Failure analysis of a globe valve." Ohio University / OhioLINK, 1996. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1178048270.
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Hoppe, Mark Mathew. "Validation of computational fluid dynamics model of a simple pump sump with vertical intake." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/86337.
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Thesis (MScEng)--Stellenbosch University, 2014.<br>ENGLISH ABSTRACT: The designs of pump intake structures are generally verified by means of a hydraulic model study to ensure the structure will operate without large air or swirl entraining vortices. This is an expensive and time consuming process. The popularity of Computational Fluid Dynamics (CFD) is ever increasing in the engineering world and the use thereof in the modelling of flows in pump intake structures is just one of the many areas of focus. The use of a validated CFD model in the design phase of pump intakes would be beneficial, and ideally would reduce the frequency of requiring hydraulic model studies.
This study investigates the applicability of using a 3 dimensional CFD model as a design tool by validation with a physical model. A physical model of a simple pump intake was available and with a few modifications the flow conditions were significantly improved. The quantitative validation of the CFD model was carried out by means of comparing corresponding point velocity magnitudes. An Acoustic Doppler Velocimeter (ADV) was used in the physical model. The data obtained were successfully filtered to remove noise and other disturbances. The qualitative validation was done by means of photographs and observations. The photographs made use of illuminated tracer particles to identify flow patterns.
The CFD model compares well qualitatively, but the velocity magnitudes are not yet sufficiently reliable. It is recommended that the CFD model can be used for qualitative studies, but future research should focus on the accuracy of the CFD model. Using higher resolution velocity measurements in the physical model by means of other types of instruments, a better comparison can be made, as well as enabling validation of the ADV readings.<br>AFRIKAANSE OPSOMMING: Die ontwerpe van die pomp inname strukture word gewoonlik bevestig deur middel van 'n hidrouliese model studie om lug-intrekking te minimeer. Dit is 'n duur en tydrowende proses . Die gebruik van Computational Fluid Dynamics ( CFD ), ‘n tipe numeriese modelle neem toe in die ingenieurswese wêreld. Die gebruik daarvan in die modellering van vloei in pomp inname strukture is net een van die vele areas van toepassing . Die gebruik van 'n betroubare CFD model in die ontwerp fase van pomp innames sal voordelig wees , en ideaal sou die noodaaklikheid van fisiese hidrouliese model studies verminder.
Hierdie studie ondersoek die toepaslikheid van die gebruik van 'n 3 -dimensionele model CFD model as 'n ontwerp instrument deur bevestiging met 'n fisiese model . 'n Eenvoudige pomp-inname model was beskikbaar en het met ‘n paar veranderinge die vloei toestande aansienlik verbeter . Die kwantitatiewe bevestiging van die CFD model is uitgevoer deur middel van vergelyking van korresponderende punt snelheid groottes. In die fisiese model is die snelhede met 'n Akoestiese Doppler Velocimeter (ADV) gemeet. Die data wat verkry is suksesvol gefiltreer om geraas en ander versteurings te verwyder . Die kwalitatiewe bevestiging is gedoen deur middel van foto's en waarnemings. In die foto's is gebruik gemaak van verligte spoor deeltjies om vloei patrone te identifiseer. Die CFD model vergelyk kwalitatief goed, maar die snelheid groottes is nog nie voldoende betroubaar nie. Dit word aanbeveel dat die CFD model gebruik kan word vir kwalitatiewe studies, maar toekomstige navorsing behoort te fokus op die verbeteringe van dieakkuraatheid van die CFD model. Met behulp van 'n hoër resolusie snelheid metings van die fisiese model, deur middel van ander tipe instrumente, kan 'n beter vergelyking gemaak word , sowel as die geldigheid van die ADV lesings in staat te stel.
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Jordan, Thomas. "Flows of pumps : structure and change in the international division of labour /." Gothenburg, Sweden : Dept. of Human and Economic Geography, School of Economics and Commercial Law, University of Gothenburg, 1992. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=003707987&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.
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Михалевич, О. Т. "Резерви покращення експлуатаційних параметрів складних газотранспортних систем". Thesis, Івано-Франківський національний технічний університет нафти і газу, 2007. http://elar.nung.edu.ua/handle/123456789/4203.
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Дисертацію присвячено удосконаленню методів керування неусталеними неізотермічними режимами газотранспортних систем на компресорних станціях і в лінійній частині трубопроводу. Проведено аналітичні дослідження термогазодинамічних процесів у складних системах. Встановлено закономірності розподілу потоку газу при змінних геометричних характеристиках і характеру гідравлічного опору, що дозволило створити новий концептуальних підхід до створення моделі керування режимами: а) математичну модель транспортної мережі з використанням методу ув’язки по вузлам; б) математичну модель газотранспортної мережі без компресорних станцій з використанням методу ув’язки по контурах із урахуванням та вибором початково-граничних умов. Створена модель керування газопотоками і формування параметрів оптимального керування. Встановлено характерні зв’язки між параметрами нестаціонарних процесів у газотранспортних системах для визначення критеріїв нестаціонарності режимів роботи лінійної частини газопроводу, а також введені критерії нестаціонарності при розрахунках режимів роботи газотранспортної системи в цілому. Розроблено класифікацію експлуатаційних режимів та розроблено методику розрахунку нестаціонарних режимів за критерієм мінімальної тривалості перехідних режимів. На основі цих математичних моделей побудовані алгоритми і програми розрахунку нестаціонарних режимів роботи газопроводів при наявності компресорних станцій і відводів, а також проведено розрахунок мінімальної витрати наливного газу для підтримки заданого тиску. Проведені аналітичні дослідження процесів пуску і зупинки компресорних станцій для вибору математичних моделей нестаціонарних процесів і врахування температурних режимів з метою забезпечення оптимального керування експлуатаційними режимами. Даний підхід дозволив розробити моделі і принципи їх реалізації для режимів роботи складної газотранспортної системи, рівномірного завантаження різнотипних газоперекачувальних агрегатів на компресорних станціях з метою мінімальних витрат паливного газу при максимальних поставках газу споживачам.<br>Диссертация посвящена усовершенствованию методов управления неустановившимися неизотермическими режимами газотранспортных систем на компрессорных станциях и в линейной части трубопровода. Во вступлении обоснована актуальность темы исследований, показана ее связь с научными планами, программами, освещены научная новизна и задачи исследований, научное и практическое значение полученных результатов, дается общая характеристика работы. Приведена информация об апробации работы, ее внедрении, раскрыв личный вклад автора. Подытоживая выполненные исследования можно сделать вывод: полная математическая модель дает возможность зафиксировать ряд явлений, которые возникают во время пуска газопровода - это колебание газа в начальный момент, перемещение нагретого газа вдоль участка магистрального газопровода, колебание температуры в произвольном сечении трубы после прохождения фронта нагретого газа й много других факторов. На основании разработанных математических моделей построены алгоритмы и программы расчета нестационарных режимов работы газопроводов при наличии компрессорных станций и от водов, а также проведен расчет минимальных затрат топливного газа для поддержания заданного давления. Проведены аналитические исследования процессов пуска - остановки компрессорных станций для выбора математических моделей нестационарных процессов и учета температурных режимов с целыо обеспечения оптимальною управления эксплуатационными режимами. Данный подход позволил разработать модели и принципы их реализации для управления режимами работы сложной газотранспортной системы, равномерной загрузки разнотипных газоперекачивающих агрегатов на компрессорных станциях с целью минимальных расходов топливного газа при максимальных поставках газа потребителям.<br>Dissertation is dedicated to the improvement of gas transporting systems unsettled non-isothermal modes management methods in the compressor stations and linear parts ol the pipelines. Analytical research of the thermal-gas-dynamic processes in complex systems has been conducted. Gas streams distribution regulations under conditions of changing geometrical characteristics and the character of hydraulic resistance have been exposed, that allowed to create the mathematical model of gas-transporting network computation by using the method of binding contour and the method of binding nodes, taking into consideration various initial and boundary conditions. The mathematical model of gas streams control and optimum gas streams management parameters forming has been created. The distinctive correlation between non-stationary processes in the gas-transporting systems parameters have been determined, that allowed to establish the criteria of non-stationary behavior of the linear part of the pipeline operating modes, ai well as to determine the complete gas-transporting system operating modes non-stationari criteria. The gas-transporting systems operating modes classification has been developed as well as the methodology of computation of the non-stationary operating modes of the gas-transporting systems using the criteria of transitory modes minimal duration have beer created. The given approach allowed developing models and principles of their realization for the complex gas-transporting system operating modes, and equal load of differen types of compressor stations gas-pumping equipment with the purpose of gas fuel minimal consumption and maximal gas delivery to the customers.
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Briggner, Viktor. "Design and comparison of PMaSynRM versus PMSM for pumping applications." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-235279.
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This master thesis aimed to design a permanent magnet assisted synchronous reluctancemachine (PMaSynRM) rotor for pump applications which were to be implemented inan existing Induction Machine stator. The machine were to be compared with a similarpermanent magnet synchronous machine (PMSM) with similar torque production in termsof cost and performance.This thesis goes through the theory of the Synchronous Reluctance Machine andthe Permanent Magnet assistance. A rotor was designed by utilizing existing design approachesand simulation of performance by use of finite element analysis. A demagnetizationstudy was conducted on the added permanent magnets in order to investigate thefeasiblity of the design.The final design of the PMaSynRM was thereafter compared to the equivalentsurface-mounted PMSM in terms of performance and cost. The performance parameterswas torque production, torque ripple, efficiency and power factor. Due to the lower torquedensity of the PMaSynRM, for equal torque production the PMSM had a 40% shorterlamination stack than the PMaSynRM.The economic evaluation resulted in that when utilizing ferrite magnets in the PMa-SynRM it became slightly cheaper than the PMSM, up to 20%. However, due to the fluctuatingprices of NdFeB magnets, there exist breakpoints below which the PMaSynRM isin fact more expensive than the PMSM or where the price reduction of the PMaSynRMis not worth the extra length of the motor. However, it was shown that the PMaSynRMis very insensitive to magnet price fluctuations and thereby proved to be a more securechoice than the PMSM<br>Detta examensarbete avsåg att designa en rotor till en permanentmagnetsassisteradsynkron reluktansmaskin (PMaSynRM) för pumpapplikationer, vilken skulle implementeras i en befintlig asynkronmaskin (IM) stator. Maskinen jämfördes ekonomiskt och prestandamässigt med en liknande synkronmaskin med permanentmagneter (PMSM) med jämförbar vridmomentsproduktion.Uppsatsen avhandlar teorin bakom synkrona reluktansmaskiner och konceptet kring permanentmagnetassistans. Rotorn designades genom användandet av befintliga designmetoder och simulering genom finit elementanalys (FEA). En avmagnetiseringsstudie utfördes på de adderade magneterna för att undersöka rimligheten kring designenDen slutgiltiga designen av PMaSynRMen jämfördes därefter mot den jämlika PMSMen i termer om prestanda och kostnad. De undersökta prestandaparameterarna var vridmoment, vridmomentsrippel, verkningsgrad och effektfaktor. Eftersom vridmomentsdensiteten i en PMaSynRM är lägre än hos en PMSM så visade sig PMSMen ha en 40% kortare lamineringskropp än PMaSynRMen vid jämnlik vridmomentsproduktion.Den ekonomiska utvärderingen resulterade i att vid användandet av ferritmagneter i PMaSynRMen så blev den något billigare än PMSMen, upp till 20%. På grund av fluktuerande priser hos NdFeB magneter, så finns det brytpunkter där PMaSynRMen faktiskt blir dyrare än PMSMen eller då kostnadsreduktionen för PMaSynRMen kan bedömas att vara för låg med tanke på den ökade längden och vridmomentsrippel. Däremot visades det att PMaSynRMen är väldigt okänslig för prisvariationer och därför visades vara ettkostnadsmässigt tryggare val än PMSMen
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Abuhaiba, Mohammad. "Mathematical Modeling and Analysis of a Variable Displacement Hydraulic Bent Axis Pump Linked to High Pressure and Low Pressure Accumulators." Connect to full text in OhioLINK ETD Center, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1240528916.
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Dissertation (Ph.D.)--University of Toledo, 2009.<br>Typescript. "Submitted as partial fulfillment of the requirements for the Doctor of Philosophy degree in Mechanical Engineering." Bibliography: leaves 203-209.
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Döhla, Werner, Jörg Bauer, and Rocco Kemnitz. "Integrated smart hydraulic displacement machine for closed systems." Technische Universität Dresden, 2020. https://tud.qucosa.de/id/qucosa%3A71225.
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The following article describes the development, validation and series introduction of a novel highly integrated smart electrohydraulic 4-quadrant displacement machine. Starting in 2012, an unique unit consisting of a hydraulic internal gear machine combined with a newly developed electric machine with integrated electronic unit was created. The developed unit aims at the application in fully active automotive chassis in combination with hydraulic shock absorbers. The very special requirements of this application resulted in a new development with numerous detailed solutions which are described below. Parallel and interacting with the product development, all new series assembly and testing devices tailored to this product was developed.
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Guo, Baoling. "Modélisation et commandes avancées de systèmes hydro-électriques à vitesse variable." Thesis, Université Grenoble Alpes (ComUE), 2019. http://www.theses.fr/2019GREAT016.
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Cette thèse s'inscrit dans le cadre du projet Innov'hydro, qui regroupe cinq laboratoires de Grenoble INP conjoints avec le CNRS et l'Université Grenoble Alpes et vise à mener une étude sur l'ensemble constitué par la turbine et le générateur électrique. Dans ce cadre, cette thèse menée dans G2Elab est dédiée aux techniques de contrôle avancées pour convertir de manière efficace l’énergie hydraulique en énergie électrique.Lorsque la centrale hydroélectrique est connectée aux réseaux comme fournisseur, à savoir le «mode PQ», elle délivre la quantité exacte de puissance active et réactive en fonction de la demande réelle ou permet d'exploiter au maximum la ressource primaire disponible. Cette thèse se focalise sur le dernier cas: le convertisseur côté machine confirme la vitesse de rotation optimale pour atteindre la puissance maximale; le convertisseur côté réseau assure la tension constante du circuit intermédiaire et envoie une alimentation de bonne qualité au réseau. Une topologie conventionnelle basée sur un générateur synchrone à aimant permanent (PMSG) est implémentée. Elle est composée d'une turbine hydraulique, de PMSG, de convertisseurs de source de tension dos à dos avec PWM en interaction avec le réseau.Une centrale hydroélectrique à vitesse variable (VS-HEP) est un système non linéaire variant dans le temps, perturbé par diverses incertitudes. Ainsi, cette thèse est dédiée à l’amélioration de la robustesse du contrôle et de la capacité de rejet des perturbations. Les contributions de cette thèse sont les suivantes:1. Modèle hydraulique et application de PHIL• Un modèle hydraulique tridimensionnel à échelle réduite est établi de manière flexible pour diverses conditions de fonctionnement en laboratoire.• Le modèle dynamique de l'actionneur à aubes directrices est introduit afin de prendre en compte les effets de la dynamique induite sur l'ensemble des performances électriques.• Sur la base du benchmark PHIL en temps réel flexible du G2Elab, un banc d'essai hydraulique à vitesse variable est construit, en cours d'adaptation pour le modèle à échelle réduite proposé.2. Contrôle avancé de la robustesse élevée et de la capacité de rejet de perturbations• Un contrôleur de vitesse basé sur ADRC est proposé pour améliorer les performances de suivi de vitesse, permettant ainsi un fonctionnement MPPT efficace. Un observateur de couple est intégré pour atténuer les effets des variations de couple hydraulique.• Un contrôleur ESO est implémenté dans la boucle de contrôle DC-Link. Il atteint une plus grande robustesse et améliore la dynamique de contrôle. Et il est simple à concevoir et à employer pour des ingénieurs.3. Technique de synchronisation basée sur ESO• Un ESO-PLL amélioré est proposé. Les incertitudes internes et les perturbations externes dans le système PLL sont estimées via ESO et activement compensées par une dynamique en boucle fermée en temps réel, ce qui permet une grande robustesse dans la gestion des perturbations.• Un intégrateur généralisé (GI)-ESO est proposé pour les systèmes présentant des perturbations sinusoïdales à haute fréquence. Un intégrateur généralisé est introduit pour estimer la perturbation haute fréquence dans la conception.• Une PLL basée sur GI-ESO est proposée pour les utilitaires distordus. Les erreurs haute fréquence apparaissant dans la phase estimée peuvent être éliminées en utilisant le GI-ESO.4. Gestion optimale des centrales hydroélectriques à stockage pompé• Une approche de programme dynamique est utilisée pour gérer de manière optimale le temps de pompage et de génération d'un système hydroélectrique hybride à stockage par pompage.• Les bénéfices de tous les régimes de fonctionnement à vitesse variable et à vitesse fixe sont comparés.• Les bénéfices quotidiens augmentent par rapport au mode de fonctionnement normal. Parallèlement, les restrictions hydrauliques et la consommation d’eau peuvent être respectées<br>This PhD thesis is in the frame of project Innov'hydro, which involves five joint Grenoble INP laboratories with the CNRS and Grenoble Alpes and aims to review the assembly composed by the turbine and the electric generator. Within this frame, this thesis carried out in G2Elab, is dedicated to advanced control techniques for efficiently converting the hydraulic energy into electric power.When the hydro-electric plant is connected with the grids as a supplier, namely `PQ mode', it either delivers the exact amount of active and reactive power according to the actual demand or allows to exploit the maximum of the available primary resource. This thesis is targeting on the latter case: The machine-side converter confirms the optimal rotational speed to achieve the maximum power; the grid-side converter ensures the constant DC-link voltage, and to send the good quality power to the grid. A conventional variable-speed direct drive Permanent Magnet Synchronous Generator (PMSG)-based topology is implemented, it is composed of a hydraulic turbine, a PMSG, back-to-back voltage source converters with PWM interacting with the three-phase grid.A Variable-Speed Hydro-Electric Plant (VS-HEP) is a nonlinear time-varying system disturbed by various uncertainties. Thus, this thesis devotes more efforts to improving the control robustness and disturbance rejection ability. The contributions of this thesis are as follows:1. Hydraulic model and PHIL implementation• A reduced-scale hydraulic model is flexibly established for various laboratory operation conditions.• The dynamic model of guide vane actuator is introduced in order to take into account the effects of the induced dynamics on the whole electric performance.• Based on the flexible real-time PHIL benchmark in G2Elab, a variable speed hydraulic test rig is built, being adapted to the proposed reduced-scale model.2. Advanced control of high robustness and disturbance rejection ability• An ADRC-based speed controller is proposed to improve the speed tracking performance, thus enabling efficient MPPT operation. Besides, a torque observer is incorporated to mitigate the effects caused by hydraulic torque variations. Experimental results prove its advantages for VS-HEP application.• An enhanced ESO-based controller is implemented into DC-link control loop. It achieves higher robustness and improve control dynamics. And it is simple to design and employ for practical engineers.3. ESO-based synchronization technique• An enhanced ESO-PLL is proposed. The internal uncertainties and external disturbances in PLL system are estimated via ESO and actively compensated into closed-loop dynamics in real-time, which can achieve high robustness in dealing with disturbances.• A Generalized Integrator (GI)-ESO is proposed for system with high-frequency sinusoidal disturbances. A generalized integrator is introduced to estimate the high-frequency disturbance in the design.• A GI-ESO-based PLL is proposed for under power quality degradation issues (unbalanced voltage, harmonics, and voltage offset). The high-frequency errors appearing in the estimated phase can be eliminated by employing the GI-ESO.4. Optimal management of pumped-storage hydro-electric plant• A forward dynamic program approach is used to optimally manage the pumping and generating operation time for a hybrid pumped-storage hydro-electric system.• The profits for all operation regimes of variable speed operation and fixed speed are compared.• The daily profits increase compared with the normal operation mode, meanwhile, it can maintain the hydraulic restrictions and water consumption to local residents
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Dakyo, Brayima. "Étude et réalisation de dispositifs à commande numérique pour l'alimentation d'une machine synchrone à aimants permanents par générateur photovoltaïque : stratégies de commande pour le pompage au fil du soleil." Le Havre, 1988. http://www.theses.fr/1988LEHA0003.
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La notion de degré de liberté pour l'optimisation de la conversion d'énergie est introduite et reliée aux différents dispositifs utilisables pour associer la machine synchrone au générateur. La réalisation de ces dispositifs associés à une commande numérique par microordinateur flexible et conviviale est décrite. Les fonctionnements et stratégies de commande sont étudies pour deux types de systèmes : alimentation par onduleur de courant a thyristor, a commutation naturelle avec un ou deux degrés de liberté; l'alimentation en tension ou en courant par un onduleur de tension MLI en technologie Mosfet.
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Рєзва, Ксенія Сергіївна. "Удосконалення проточних частин високонапірних оборотних гідромашин на основі чисельного моделювання їх гідродинамічних характеристик". Thesis, Національний технічний університет "Харківський політехнічний інститут", 2019. http://repository.kpi.kharkov.ua/handle/KhPI-Press/40009.
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Дисертація на здобуття наукового ступеня кандидата технічних наук за спеціальністю 05.05.17 – гідравлічні машини і гідропневмоагрегати. – Національний технічний університет "Харківський політехнічний інститут", Харків, 2019 р.
Дисертацію присвячено вирішенню науково-практичної задачі удосконалення проточних частин високонапірних оборотних гідромашин за рахунок розробки методів розрахунку та аналізу їх гідродинамічних характеристик. На підставі розгляду тенденцій розвитку гідроенергетики України, з урахуванням ролі високонапірних оборотних гідромашин в об'єднаній енергетичній системі, відмічено актуальність проектування нових проточних частин. Визначено переваги та недоліки існуючих методів дослідження гідродинамічних процесів у проточних частинах оборотних гідромашин. Наведені результати розрахунку гідродинамічних характеристик елементів проточної частини на основі методу осереднених безрозмірних параметрів для оборотних гідромашин ОРО200-В-100 та ОРО500-В-100. Застосована математична модель робочого процесу гідромашини на основі блочно-ієрархічного підходу для проведення дослідження балансу енергії. Визначено вплив геометричних параметрів елементів проточної частини на показники роботи. Проведено чисельне дослідження просторової течії рідини в проточній частині високонапірних оборотних гідромашин за допомогою CFD, що дозволило визначити та візуалізувати картину течії. Складено баланси енергії гідромашин ОРО200-В-100 та ОРО500-В-100. Відмічено, що розподіл втрат по елементам проточної частини нерівномірний: для ОРО200-В-100 найбільшу частину втрат складають втрати в робочому колесі (близько 56 %), для ОРО500-В-100 – втрати у підводі (близько 62 %). Описано основні положення визначення оптимального режиму роботи оборотної гідромашини. Запропоновано та досліджено модифікований підвід для тихохідної оборотної гідромашини ОРО500-В-100, щоб підвищити її енергетичні показники: краще узгоджені елементи ПЧ та гідравлічний ККД збільшився на 2 %.<br>Thesis for granting the Degree of Candidate of Technical sciences in speciality 05.05.17 – Hydraulic machines and hydropneumatic units. – National Technical University "Kharkiv Polytechnic Institute", 2019.
The tеhesis is devoted to the solution of the scientific and practical problem of improvement of the water passages of the high-pressure reversible hydraulic due to calculation and analysis their hydrodynamic characteristics. Based on the review of the trends in the development of hydropower engineering in Ukraine and given the role of high-pressure reversible hydraulic machines in the United Power System, it was noted that the designing a new flow parts is topical task. Advantages and disadvantages of the existing methods for research hydrodynamic processes in water passages of reversible hydraulic machines were identified after their analysis. The results of the calculation of the hydrodynamic characteristics of the elements of the water passages based on the method of averaged dimensionless parameters using the example of reversible hydraulic machines OPO200-B-100 and OPO500-B-100 were demonstrated. The mathematical model of the hydraulic machine working process based on a block-hierarchical approach was used to study the energy balance in the turbine and pump modes of hydraulic machines. The influence of the geometrical parameters of the elements of the water passage on the performance was determined: how the angle of flow in the spiral casing (cп ), the height of the wicket gate (b0 D) and the shape of the wicket gate profile influence the value of the coefficient resistance in the wicket gate. A numerical study of the three-dimensional flow of fluid in the water passage of high-pressure reversible hydraulic machines was carried out using the CFD software. This program allows determining the character of the flow and presenting the fields of distribution of velocity components, pressure and streamlines. The balances of energy were compiled: for the OPO200-B-100 in the turbine and pump operation modes, for the OPO500-B-100 in the turbine operation mode. It is noted that the distribution of losses on the elements of the water passage is not uniform: for the OPO200-B-100, the greatest part of the total losses are losses in the runner (about 56%), for OPO500-B-100 - losses in the inlet (about 62%). The main points for determining the optimal operating mode of the reversible hydraulic machine are described. The modified inlet for low-speed high-pressure hydraulic machine OPO500-B-100 was proposed and investigated to increase energy performance of hydraulic machine. The spiral casing was expanded, the number of stay vane blades and wicket gate blades were reduced to 16. As a result of the calculations of the modified inlet, the obtained results showed that the second variant made it possible to better align the elements of the water passage and the hydraulic efficiency increased by 2 %.
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Рєзва, Ксенія Сергіївна. "Удосконалення проточних частин високонапірних оборотних гідромашин на основі чисельного моделювання їх гідродинамічних характеристик". Thesis, Національний технічний університет "Харківський політехнічний інститут", 2018. http://repository.kpi.kharkov.ua/handle/KhPI-Press/40011.
Full textAbstract:
Дисертація на здобуття наукового ступеня кандидата технічних наук за спеціальністю 05.05.17 – гідравлічні машини і гідропневмоагрегати. – Національний технічний університет "Харківський політехнічний інститут", Харків, 2019 р.
Дисертацію присвячено вирішенню науково-практичної задачі удосконалення проточних частин високонапірних оборотних гідромашин за рахунок розробки методів розрахунку та аналізу їх гідродинамічних характеристик. На підставі розгляду тенденцій розвитку гідроенергетики України, з урахуванням ролі високонапірних оборотних гідромашин в об'єднаній енергетичній системі, відмічено актуальність проектування нових проточних частин. Визначено переваги та недоліки існуючих методів дослідження гідродинамічних процесів у проточних частинах оборотних гідромашин. Наведені результати розрахунку гідродинамічних характеристик елементів проточної частини на основі методу осереднених безрозмірних параметрів для оборотних гідромашин ОРО200-В-100 та ОРО500-В-100. Застосована математична модель робочого процесу гідромашини на основі блочно-ієрархічного підходу для проведення дослідження балансу енергії. Визначено вплив геометричних параметрів елементів проточної частини на показники роботи. Проведено чисельне дослідження просторової течії рідини в проточній частині високонапірних оборотних гідромашин за допомогою CFD, що дозволило визначити та візуалізувати картину течії. Складено баланси енергії гідромашин ОРО200-В-100 та ОРО500-В-100. Відмічено, що розподіл втрат по елементам проточної частини нерівномірний: для ОРО200-В-100 найбільшу частину втрат складають втрати в робочому колесі (близько 56 %), для ОРО500-В-100 – втрати у підводі (близько 62 %). Описано основні положення визначення оптимального режиму роботи оборотної гідромашини. Запропоновано та досліджено модифікований підвід для тихохідної оборотної гідромашини ОРО500-В-100, щоб підвищити її енергетичні показники: краще узгоджені елементи ПЧ та гідравлічний ККД збільшився на 2 %.<br>Thesis for granting the Degree of Candidate of Technical sciences in speciality 05.05.17 – Hydraulic machines and hydropneumatic units. – National Technical University "Kharkiv Polytechnic Institute", 2019.
The tеhesis is devoted to the solution of the scientific and practical problem of improvement of the water passages of the high-pressure reversible hydraulic due to calculation and analysis their hydrodynamic characteristics. Based on the review of the trends in the development of hydropower engineering in Ukraine and given the role of high-pressure reversible hydraulic machines in the United Power System, it was noted that the designing a new flow parts is topical task. Advantages and disadvantages of the existing methods for research hydrodynamic processes in water passages of reversible hydraulic machines were identified after their analysis. The results of the calculation of the hydrodynamic characteristics of the elements of the water passages based on the method of averaged dimensionless parameters using the example of reversible hydraulic machines OPO200-B-100 and OPO500-B-100 were demonstrated. The mathematical model of the hydraulic machine working process based on a block-hierarchical approach was used to study the energy balance in the turbine and pump modes of hydraulic machines. The influence of the geometrical parameters of the elements of the water passage on the performance was determined: how the angle of flow in the spiral casing (cп ), the height of the wicket gate (b0 D) and the shape of the wicket gate profile influence the value of the coefficient resistance in the wicket gate. A numerical study of the three-dimensional flow of fluid in the water passage of high-pressure reversible hydraulic machines was carried out using the CFD software. This program allows determining the character of the flow and presenting the fields of distribution of velocity components, pressure and streamlines. The balances of energy were compiled: for the OPO200-B-100 in the turbine and pump operation modes, for the OPO500-B-100 in the turbine operation mode. It is noted that the distribution of losses on the elements of the water passage is not uniform: for the OPO200-B-100, the greatest part of the total losses are losses in the runner (about 56%), for OPO500-B-100 - losses in the inlet (about 62%). The main points for determining the optimal operating mode of the reversible hydraulic machine are described. The modified inlet for low-speed high-pressure hydraulic machine OPO500-B-100 was proposed and investigated to increase energy performance of hydraulic machine. The spiral casing was expanded, the number of stay vane blades and wicket gate blades were reduced to 16. As a result of the calculations of the modified inlet, the obtained results showed that the second variant made it possible to better align the elements of the water passage and the hydraulic efficiency increased by 2 %.
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Rizzo, Audrey. "L'approche CRONE dans le domaine des architectures complexes des suspensions de véhicules automobiles : la suspension CRONE Hydractive." Thesis, Bordeaux 1, 2012. http://www.theses.fr/2012BOR14564/document.
Full textAbstract:
Cette thèse s'inscrit dans la continuité des travaux de l'équipe CRONE appliqués à la suspension. Cette thèse permet de proposer une suspension CRONE qui non seulement gère le compromis Isolation vibratoire/ tenue de caisse mais également isolation vibratoire/ tenue de roue. Pour cela un critère est développé sur la tenue de roue, applicable à tous types de suspensions permettant l’analyse et le dimensionnement de la suspension pour le contrôle de roue. De plus afin de lever le dilemme entre sollicitations route et sollicitation conducteur, une stratégie pour les suspensions bi -états est proposée et appliquée sur suspension hydractive. Enfin , un travail de formalisme de l’ influence la suspension sur la dynamique véhicule fut réalisé permettant d ’enrichir la stratégie de commutation déjà développée pour agir en virage et en freinage et ainsi optimiser l’utilisation de la suspension<br>This thesis follows some previous work of the CRONE team applied to carsuspensions. It allows to purpose one car suspension, called CRONE car suspension, whichimproves the compromise between low frequency road filtering and car holding and thecompromise between hight frequency road filtering and wheel holding. To hold the wheel acriterium on the wheel holding is developed. This criterium can be used to analyse and tunedall kind of car suspension around the wheel pulsation. Moreover, to fight against thecompromise between the driver input and the raod input, a control laws is developed andapplied to a bi-state car suspension called hydractive car suspension. Finally, the influence ofthe car suspension tuning on the vehicle dynamic and more precisely on the ESP, ABSsystems is studied and illustrated with some first experiments
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Copic, Davor. "A MEMS Knudsen pump for high gas flow applications." 2008. http://etd.louisville.edu/data/UofL0414t2008.pdf.
Full textAbstract:
Thesis (M.Eng.)--University of Louisville, 2008.<br>Title and description from thesis home page (viewed May 14, 2008). Department of Mechanical Engineering. "April 2008." Includes bibliographical references (p. 55-56).
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Govender, T. "Strategic issues for life extension of boiler feed pump drives at coal fired power stations." Thesis, 2010. http://hdl.handle.net/10210/3433.
Full textAbstract:
M.Ing.<br>South Africa is presently experiencing a power shortage problem. This has led to numerous investigations into generating needed capacity and finding ways of saving power where possible, in order to sustain an acceptable extra capacity of at least ten percent. This dissertation investigates the possibility of saving power consumed by the electrical boiler feed pumps through engineering management strategies. The technical system drive unit is considered as a case study and consists of the following electrical and mechanical components: • Boiler feed pump. • Boiler feed pump transformer. • Variable speed drive. The methods identified to improve the Variable Speed Drive (VSD) system reliability and obtain total efficiency are: • Technical evaluation of the system. • Engineering management tools including reliability and availability. • A strategic focus on reliability improvement. Technical evaluation of the system includes evaluating the condition of the existing system and possibly replacing it with the latest technology should the system prove inefficient. Engineering management tools such as Total Quality Management (TQM) and Total Productive Maintenance (TPM) ensure that the plant is in a high state of readiness at all times. Strategic management issues in the broader context that influence reliability and availability management have been identified to improve productivity contributing to total organizational overall efficiency. One of the main research conclusions of the dissertation is that not only inherent reliability of a technical system is important but also the achievable reliability in the broader strategic organizational context. The research strategy was exploratory and included an integrated case study on electrical boiler feed pump drives.
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Li, Tyler Bo. "Design and control of a variable displacement vane pump for valveless hydraulic acutation." Diss., 2008. http://etd.library.vanderbilt.edu/ETD-db/available/etd-09222008-104852/.
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Parbhoo, Meeshal. "A cost study comparing imported liquid pumps against locally manufactured pumps." Thesis, 2014. http://hdl.handle.net/10210/10816.
Full textAbstract:
M.Ing. (Engineering Management)<br>The purpose of this dissertation was to compare the local manufacturing of liquid pumps in South Africa against the importation of pumps manufactured on the international markets as well as also investigate the capacity limitations of the local pump manufacturers; the technologies available on overseas markets (in terms of electric, solar and wind-powered liquid pumps) and comparing the technologies to those available in South Africa. Five of the leading pump manufacturers were researched in this dissertation namely: KSB; Grundfos; Howden Pumps; Sulzer Pumps Africa and Warman Pumps. South African pump manufacturers are importing most of their pumps from international markets with the primary reason being to meet demands. By comparison, South African pump manufacturers are finding it difficult to produce pumps with equivalent or lower costs than the pumps which are produced on the international markets. Pump manufacturers on international markets offer greater cost savings for South African pump manufacturers which ultimately results in financial savings and a higher yield in profits. Many international pump manufacturers use advanced technology which makes the production costs of pump components as much as twenty percent (20%) less as compared to the South African pump industry. The importation of pumps is a method used to increase the local supply of pumps as the cost of the pump, including import costs, are not as costly as actually manufacturing the pumps in South Africa. While South African pump manufacturers manufacture pumps of relatively high energy consumption and monetary costs; they also produce standard conventional pumps which are required to supply the local demand. Local pump manufacturers were approached to find out exactly how they cope with these stringent requirements by the South African markets, yet still achieve the profits in the industry to remain afloat. Various pump forms were researched specifically relating to the pumps used on the South African markets with regards to their production costs, advantages and disadvantages (wind and solar pump technologies). Standard conventional pumps are preferred on local markets by as much as fifteen percent (15%) with newer technologies (solar and wind powered pumps) being preferred on the international markets. South Africa continues to demand standard conventional pumps (electric-driven pump) although demands for newer technology is on the increase. The international market’s production lines are mature and well established which results in a lower cost of production which leads to these pumps being of more demand as compared to newer pumps which are currently the preference. Local pump manufacturers can satisfy the demand and benefit from the lower importation cost of standard conventional pumps. The preliminary results suggest that the importing of pumps from international markets aid local manufacturers in keeping up with the demand and accquiring sufficient profits. Modern technologies such as solar and wind power is a growing maket in South Africa and is becoming increasingly common. The research approach used in this study involved targeting five of the local pump manufacturers in South Africa. Each manufacturer was asked a series of questions relating to the research questions in order to draw up conclusions regarding the problem statement and hypothesis. Findings from the conducted surveys were compared to the literature which is currently published. Findings show that local pump manufacturers are dependent on imports in order to satisfy the demand for standard conventional pumps rather than manufacturing their own and the use of newer technologies are increasing in the local pump industry.
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Denny, Ernest Edward. "Development of a computer program for general use in the design of solar powered water pumping systems." Thesis, 2007. http://hdl.handle.net/10352/277.
Full textAbstract:
M. Tech. (Electrical Engineering, Faculty of Engineering) Vaal University of Technology)<br>Water is one of the basic necessities of life. In addition to being essential for the
maintenance of life, this basic resource is a crucial requirement for combating
poverty, hunger and disease in South African communities. In excess of twenty-nine
percent of South African households do not have water in either their dwellings, or
on site (source: 2005 RSA census data).
This study documents an engineering solution to the problem of water pumping,
utilising renewable energy (solar power) and readily available pumping hardware,
configured via a structured design process. Resultant from the research, a software
application has been developed that facilitates the design of solar (photovoltaic)
powered water pumping applications. The selected design configuration of a nontracking, stand-alone, directly coupled system provides for the most robust and least
complex design possible, making it imminently suitable for application in rural
African conditions. Operation of the program is via a simple graphical user interface,
with full and context sensitive help provided. It is tailored for use in Southern Africa
and is provided with comprehensive databases of location dependant design
information such as solar radiation, meteorology and magnetic declination data,
together with expandable databases of pre-configured pump and solar panel
hardware specification data. The program is manufacturer and component
independent, with no affiliations in the choice of hardware.
Design methodologies, together with a component matching strategy. Optimisation is
achieved by a quantitative and efficiency 'best fit' analysis of the selected hardware
components within the design context. Design output predictions are tabulated and
graphed by month for a period of one year, allowing design visualisation.
The application has been named 'South African Stand-alone Solar (PV) Water
Pumping Design Aid', abbreviated as 'SAS-SWP' in its run-time form. The SASSWP
application is illustrated in the functional overview provided in Figure 1.<br>VUT
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Biscos, Cedric P. G. "Optimal operation of a water distribution network by predictive control using MINLP." Thesis, 2004. http://hdl.handle.net/10413/9015.
Full textAbstract:
The objective of this research project is to develop new software tools capable of operational
optimisation of existing, large-scale water distribution networks. Since pumping operations
represent the main operating cost of any water supply scheme, the optimisation problem is
equivalent to providing a new sequence for pumping operations that makes better use of the
different electricity tariff structures available to the operators of distribution systems. The
minimisation of pumping costs can be achieved by using an optimal schedule that will allow
best use of gravitational flows, and restriction of pumping to low-cost power periods as far as
possible.
A secondary objective of the operational optimisation is to maintain the desired level of
disinfectant chlorine at the point of delivery to consumers. There is a steady loss of chlorine
with residence time in the system. If the level drops too low there is a risk of bacterial activity.
Re-dosage points are sometimes provided in the network. Conversely, too high a level produces
an unacceptable odour.
The combinatation of dynamic elements (reservoir volumes and chlorine concentration responses)
and discrete elements (pump stati and valve positions) makes this a challenging Model
Predictive Control (MPC) and constrained optimisation problem, which was solved using
MINLP (Mixed Integer Non-linear Programming). The MINLP algorithm was selected for its
ability to handle a large number of integer choices (valves open or shut / pumps on or off in this
particular case).
A model is defined on the basis of a standard element, viz. a vessel containing a variable volume, capable of receiving multiple inputs and delivering just two outputs. The physical properties of
an element can be defined in such a way as to allow representation of any item in the actual
network: pipes (including junctions and splits), reservoirs, and of course, valves or pumps. The
overall network is defined by the inter-linking of a number of standard elements. Once the
network has been created within the model, the model predictive control algorithm minimises a
penalty function on each time-step, over a defined time horizon from the present, with all
variables also obeying defined constraints in this horizon. This constrained non-linear
optimization requires an estimate of expected consumer demand profile, which is obtained from
historical data stored by the SCADA system monitoring the network. Electricity cost patterns,
valve positions, pump characteristics, and reservoir properties (volumes, emergency levels,
setpoints) are some of the parameters required for the operational optimisation of the system.<br>Thesis (M.Sc.Eng.)-University of Natal, Durban, 2004.
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Museka, Zvikomborero Austen. "Predictive maintenance as a means to increase the availability of a positive displacement pump." Thesis, 2015. http://hdl.handle.net/10210/13829.
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