Academic literature on the topic 'Hydraulic puller'
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Journal articles on the topic "Hydraulic puller"
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Skolfield, Louis. "Hydraulic Lid Puller Prevents Injuries, Saves Time." Opflow 33, no. 10 (October 2007): 24. http://dx.doi.org/10.1002/j.1551-8701.2007.tb01938.x.
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Armfirst, Junggie Guko, and Arasy Fahruddin. "Design of Hydraulic Puller for Releasing Crankshaft Bearings on Motorcycle." R.E.M. (Rekayasa Energi Manufaktur) Jurnal 4, no. 2 (December 30, 2019): 119–27. http://dx.doi.org/10.21070/r.e.m.v4i2.809.
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The bearing puller on the market today still has a way of working using a gripper with a screw working system. The time required is relatively long and can allow damage to the crankshaft during the bearing release process as well as reduced work performance of the crankshaft. This study aims to design a tool that works with a hydraulic system to release crankshaft motorbike bearings. This tool makes it easy for everyone to do the job of removing bearings. The outer bearing hydraulic tracker or puller uses the working principle of the lever that is pumped with calculated pressure and load and the fluid pressure on the tracker can be known ie at 1X the tracker pump requires 41 kg / cm2 fluid pressure, 2X fluid pressure tracker pump 45 kg / cm2 and 3X pump tracker requires 72 kg / cm2 fluid pressure. As well as the time needed to remove the crankshaft bearing motor especially on the A and B motorbike. To release the crankshaft bearing A motor takes 19.78 s and removing the crankshaft bearing the B motor takes 31.95 s.
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Novikov, Vitaly I., Alexander E. Pushkarev, Alexander P. Scherbakov, and Oleg V. Kuzmin. "Heat balance calculation specifics with considered roughness reduction for jet-grouting hydraulic puller working surfaces finished by electrolytic plasma polishing." Metalloobrabotka, no. 4 (2020): 16–23. http://dx.doi.org/10.25960/mo.2020.4.16.
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Tawi, Kamarul Baharin, Izhari Izmi Mazali, Bambang Supriyo, Nurulakmar Abu Husain, Mohd Salman Che Kob, and Yusrina Zainal Abidin. "Pulleys' Axial Movement Mechanism for Electro-Mechanical Continuously Variable Transmission." Applied Mechanics and Materials 663 (October 2014): 185–92. http://dx.doi.org/10.4028/www.scientific.net/amm.663.185.
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Pulley-based continuously variable transmission (CVT) with Metal Pushing V-belt (V-belt) is a type of automotive transmission that is widely applied currently by many car manufacturers worldwide. Unlike the conventional automotive transmissions, in a pulley-based CVT with V-belt, the transmission ratio (CVT ratio) is changed continuously without the use of discrete gears. Instead, the CVT ratio is varied through the simultaneous axial movement of the primary pulley and the secondary pulley. By axially moving both pulleys simultaneously, the radius of the V-belt on both pulleys will be changed accordingly, resulting in the change of the CVT ratio. The existing pulley-based CVTs in the market use electro-hydro-mechanical (EHM) actuation system to change and to maintain the desired CVT ratio through the hydraulic pressure. However, the application of EHM actuation system leads to some disadvantages, particularly in term of the high power consumption from the engine needed to maintain the desired CVT ratio. This reduces the efficiency of the powertrain system, which eventually increases the fuel consumption of the vehicles. In addition to that, the existing pulley-based CVTs also use single acting pulley mechanism to axially move the pulleys for changing the CVT ratio. Therefore, the issue of V-belt's misalignment, which shortens the lifespan of the V-belt, is inevitable here. In this paper, the pulleys' axial movement mechanism that uses electro-mechanical (EM) actuation system is proposed. Consequently, the working principle of the proposal is described and its potential benefits are discussed.
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Davidenko, P. M., V. B. Strutinskii, and V. I. Rashkulev. "Hydraulic jet pulser with high loading frequency." Strength of Materials 17, no. 4 (April 1985): 573–76. http://dx.doi.org/10.1007/bf01533965.
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Mir-Nasiri, N., and B. Almenov. "Design of a Novice Hydraulic Buoyant Force Engine." Applied Mechanics and Materials 705 (December 2014): 71–78. http://dx.doi.org/10.4028/www.scientific.net/amm.705.71.
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In connection with the consumptive depletion of the earth and the destructive effect of emissions of combustion products on the environment, now all of humanity is in search for alternative energy sources. The proposed technology intends to produce electricity directly at the consumer location or in close vicinity to it by utilizing the concept of vertical buoyancy power generation in a still water reservoir and thus able to lower the cost of electricity and save the fossil fuels. The newly invented machine is able to converts the buoyance force energy into mechanical energy of shaft rotation, and thus into the electricity via rotary generator. The hydraulic buoyant force engine system includes two cylindrical pulleys with belt transmission mounted on the stationary frame that is submerged into the water. The belt carries the chain of elastic plastic airbags to generate the buoyance force. The empty and weightless airbags are driven first by the belt and pulleys system to the bottom of a water reservoir where they are filled with the air delivered by the compressor and then the bulged bags and thus connected belt are driven up by the buoyant force. As a result the belt and shaft of the connected to the upper pulley generator will be constantly driven by the buoyant force. The paper describes the details of the engine construction, the amount of power generated by the engine as a function of the reservoir depth and the power of an air compressor as well as advantages of such engine installations and their impact on the society.
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Zhang, Ji Ping, Xin Ping Han, Shi Jin Ma, and Jing Cheng Zhang. "Full Hydraulic and Control Systems Application in Open-Cut Mine Drill." Applied Mechanics and Materials 318 (May 2013): 91–95. http://dx.doi.org/10.4028/www.scientific.net/amm.318.91.
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The LWD-200B full hydraulic open cut mine drill's hydraulic system uses a variable displacement pump with load sensing constant power, load sensitive electromagnetic proportional multi-way directional valve, high torque hydraulic motor overhead direct drive rotary head, a long stroke hydraulic cylinder and steel wire rope and pulley speed lifting system, hydraulic cylinder to drive the unloading rod mechanism, hydraulic motor driving crawler, double hydraulic cylinder lifting the drill frame mechanism, a hydraulic motor driven cable winding drum, hydraulic legs leveling method. Control system adopts the control handle and the PLC control mode, with real-time data acquisition, computer automatic recognition of lithology and closed loop feedback control and GPS precise positioning function, to achieving the automatic or manual drilling, specified depth or level drilling. Through the test of practice, it is a multifunctional, fully hydraulic, which is intelligent and efficient perforation equipment.
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Liangbin, D., G. Li, S. Tiantai, M. Zhang, and H. Shi. "Study on hydraulic pulse cavitating jet drilling in unconventional natural gas wells." "Proceedings" of "OilGasScientificResearchProjects" Institute, SOCAR, no. 4 (December 30, 2014): 19–26. http://dx.doi.org/10.5510/ogp20140400217.
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Kuo, Kei Lin. "Study on Optimal Load for Hydraulic Control System of Continuously Variable Transmission." Advanced Materials Research 516-517 (May 2012): 665–68. http://dx.doi.org/10.4028/www.scientific.net/amr.516-517.665.
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In recent years, the main research focus for vehicle transmission systems has been the development of the Continuously Variable Transmission (CVT). CVTs can provide passengers with greater comfort, reduce energy consumption, and offer better transmission efficiency. CVT systems achieve the desired gear ratio by adjusting the hydraulic pressure on the rear and front pulleys using a solenoid valve. Our study aims to increase the efficiency of an existing CVT system, without reducing its performance. In this study have modified the CVT so that we can independently control the external and internal axes electronically. The speed of the hydraulic pump in the gearbox is not affected by the engine speed. In this way, In this study can achieve the lowest possible hydraulic pressure. In our study, In this study use the visual programming language LabVIEW as the human-machine interface for the monitoring program. In addition, a data acquisition system is used to collect experimental parameters, record data in real time, and perform data consolidation. Our system uses varying loads in order to evaluate the improvement in transmission efficiency over many operating conditions. Through the use of solenoids valves acting together, the pipeline hydraulic pressure can be varied. The widths of the front and rear pulleys are thus changed to achieve the goal of continuous variation. Under different loads, the relationships between the measured efficiency and the hydraulic pressure on the rear and front pulleys are used to verify and confirm the increase in efficiency achieved by controlling the hydraulic pressure.
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Yang, Yan Gui, Zhi Xin Chen, Min Xun Lu, and Zhi Qiang Xu. "System of Lifting and Lowering Base Plate Used in Deep-Water Exploration Ship." Advanced Materials Research 634-638 (January 2013): 3806–10. http://dx.doi.org/10.4028/www.scientific.net/amr.634-638.3806.
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This paper presents a new scheme of lifting and lowering base plate used in deep-water exploration ship. The scheme with a wire rope and two fixed pulley acted as rotary lifting points ensures that the base plate can be lifted or lowered when one of the two winches breaks down. A closed circuit system is designed to actuate two winches to lift or lower the base plate. The working principle and characteristics of the hydraulic system was described. The parameters of components in the closed circuits were calculated according to the design conditions and design requirements given. Finally, the hydraulic equipment based on the hydraulic system was tested by using a simple test setup. The results of the test indicate that the hydraulic equipment meets the design requirements.
Dissertations / Theses on the topic "Hydraulic puller"
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Votava, Michal. "Hydraulické posunovače." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-254345.
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This diploma thesis deals with the design of the hydraulic puller. Furthermore, the diploma thesis presents the analysis of possible design solutions. It includes processing the selected design of the hydraulic puller with parameters: maximum pushing force 50 kN, speed of work movement 0,05 m.s-1. The analysis by using finite element method (FEM) is made. The next part of thesis includes the design of hydraulic circuit of puller. In the last part of thesis there is the design for replacement of hydraulic puller by mechanical systems.
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Kvasnica, Tomáš. "Hydraulické posunovače." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2009. http://www.nusl.cz/ntk/nusl-228403.
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This Diploma thesis occupies with design of hydraulic puller. In work are mentioned possible types of construction. Choice construction of puller is disposed with parameters: maximum pushing force 50 kN, speed of piston rod 0,05 m/s. This work also contains FEM analysis by computer programme I-DEAS. The work also occupies with design of fluid drive.
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Pavelka, Roman. "Hydraulické posunovače." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-229740.
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This diploma thesis deals with the mechanical proposal of hydraulic puller. Furthermore, it includes the detail design solutions. The project also includes the calculation of the hydraulic puller parameters: maximum pushing force is 60 kN, speed of movement is 0.1 m s-1. This work also contains of stress analysis FEM with I-DEAS software. Following part deals with the design of hydraulic circuit for driving puller. At the end of work there are options for replacements of hydraulic puller by mechanical systems.
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Hammer, Jaroslav. "Elektromechanická alternativa hydraulické lineární tahové jednotky." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2008. http://www.nusl.cz/ntk/nusl-227928.
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In this diploma thesis is accomplished description of existing condition of decorating linear tractive unit. Analysis of safety requirements for linear tractive unit is also accomplished. Eligible construction concept of frame of electromechanical linear tractive unit is chosen. Selection and calculation of ball screw and nut is made also with draft of its eligible support . Choose of eligible engine and clutch for gearing of engine torque from engine to the ball screw is done too. Further is designed eligible concept of gearing of the rotary motion of ball screw to straight motion of bottom pulley block, which now interacting with upper firm pulley block provides lifting of tensile rod with coulisse.
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Sund, Mattias, and Fredrik Magnusson. "Numerical study on hydraulic verticallift gate during shutdown process." Thesis, KTH, Mekanik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-204953.
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China is undergoing a rapid increase in their development of hydropower.Due to this rapid increase, China has become one of theleading countries in technological solutions regarding the constructionof the hydropower plant. The hydro resources in China are extensivebut building a new power plant is laborious and costly. Upgrading anexisting power plant is therefore of interest. Increasing the volume flowis one way, but this can bring problems to the hydraulic structures.The design of hydraulic gates is crucial for operating a hydropowerplant safely. An emergency gate is especially important as it protectsthe turbine situated downstream of the gate. In this study, a numericalsimulation of the shutdown process of a hydraulic vertical lift gatewas conducted. The simulation was done in two dimensions using theReynolds Navier Stokes Equations (RANS), together with the RNGk ≠ ‘ turbulence model and the Volume of Fluid method (VOF). Thegoal was to extract the pressure distribution around the gate, subsequently,attaining the hydrodynamic forces and also to observe andanalyze the flow surrounding the gate. The simulation was comparedwith existing experimental data, from a 1/18 scale model, for validation.Once the model was validated, eight different cases were tested toimprove the operating conditions. The closing speed of the gate andthe gate bottom angle was altered in order to reduce the down-pullforce and undesirable flow phenomena. It was found that lowering thegate speed to 8.1 m/min would have positive effect. As the gate closesrelatively fast with reduced forces compared to a faster speed, and withless induced vibrations than with a slower speed. Changing the gatebottom angle from 9¶ to 30¶, would also have a considerable positiveinfluence of the lowered gate vibrations. However changing the bottomangle needs to be more thoroughly studied concerning structuraleffects.
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Dítě, Michal. "Zvedací plošina." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-241928.
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This thesis deals with searches different types of lift tables. Create design of several lift tables with different drive of platform for load capacity 800 kg and stroke 700 mm. Compare this solution. Selection suitable alternatives of Kwapil & Co GmbH company. Drafting assembly drawings of several alternatives.
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Srinivasan, C. "Analysis Of Solute Transport In Porous Media For Nonreactive And Sorbing Solutes Using Hybrid FCT Model." Thesis, Indian Institute of Science, 2000. http://hdl.handle.net/2005/218.
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The thesis deals with the numerical modeling of nonreactive and nonlinearly sorbing solutes in groundwater and analysis of the effect of heterogeneity resulting from spatial variation of physical and chemical parameters on the transport of solutes. For this purpose, a hybrid flux corrected transport (FCT) and central difference method based on operator-split approach is developed for advection-dispersion solute transport equation. The advective transport is solved using the FCT technique, while the dispersive transport is solved using a conventional, fully implicit, finite difference scheme. Three FCT methods are developed and extension to multidimensional cases are discussed.
The FCT models developed are anlaysed using test problems possessing analytical solutions for one and two dimensional cases, while analysing advection and dispersion dominated transport situations. Different initial and boundary conditions, which mimic the laboratory and field situations are analysed in order to study numerical dispersion, peak cliping and grid orientation. The developed models are tested to study their relative merits and weaknesses for various grid Peclet and Courant numbers. It is observed from the one dimensional results that all the FCT models perform well for continuous solute sources under varying degrees of Courant number restriction. For sharp solute pulses FCT1 and FCT3 methods fail to simulate the fronts for advection dominated situations even for moderate Courant numbers. All the FCT models can be extended to multidimensions using a dimensional-split approach while FCT3 can be made fully multidimensional. It is observed that a dimensional-split approach allows use of higher Courant numbers while tracking the fronts accurately for the cases studied. The capability of the FCT2 model is demonstrated in handling situations where the flow is not aligned along the grid direction. It is observed that FCT2 method is devoid of grid orientation error, which is a common problem for many numerical methods based on Cartesian co-ordinate system.
The hybrid FCT2 numerical model which is observed to perform better among the three FCT models is extended to model transport of sorbing solutes. The present study analyses the case of nonlinear sorption with a view to extend the model for any reactive transport situation wherein the chemical reactions are nonlinear in nature. A two step approach is adopted in the present study for coupling the partial differential equation governing the transport and the nonlinear algebraic equation governing the equilibrium sorption. The suitability of explicit-implicit (EI - form) formulation for obtaining accurate solution coupling the transport equation with the nonlinear algebraic equation solved using a Newton-Raphson method is demonstrated. The performance of the numerical model is tested for a range of Peclet numbers for modelling self-sharpening and self-smearing concentration profiles resulting from nonlinear sorption. It is observed that FCT2 model based on this formulation simulates the fronts quite accurately for both advection and dispersion dominated situations. The delay in the solute mobility and additional dispersion are analysed varying the statistical parameters characterising the heterogeneity namely, correlation scale and variance during the transport of solutes and comparisons are drawn with invariant, cases. The impact of dispersion during the heterogeneous transport is discussed.
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Čaněk, Michal. "Ultrazvukové měření velkoformátových obkladů." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2021. http://www.nusl.cz/ntk/nusl-433441.
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The diploma thesis deals with influence of the used adhesive to large format tiles properties after installation. Properties on large format tiles were monitored by ultrasonic pulse velocity method. Hydraulic setting adhesives were tested in second part. Strength and modulus of elasticity were tested. The development of shrinkage over time was also monitored. The results were summarized in tabular and graphical form and were examined by simple statistical analysis to determine resulting conclusions.
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Salgado, Monique Toledo. "Modelo matemático para avaliação hidrodinâmica em reatores tubulares operando em regime não-permanente." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/18/18138/tde-04052009-132725/.
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No meio científico são bastante utilizados os modelos matemáticos para avaliar as características hidrodinâmicas de reatores, porém a literatura é pobre em informações relativas à aplicação do equacionamento matemático em regime não-permanente. Neste trabalho foi aplicado um modelo matemático simulando a hidrodinâmica de reatores tubulares com dispersão para avaliar o efeito da variação de vazão afluente sobre os parâmetros hidrodinâmicos. As simulações foram efetuadas considerando vazão e volume constantes, vazão e volume variáveis e vazão variável e volume constante. Foi investigada a influência de dois tipos de ensaios estímulo-resposta, pulso e degrau, para aplicação de modelos matemáticos e determinação das curvas de distribuição do tempo de residência (DTR) experimentais. Teoricamente ambos devem fornecer os mesmos resultados embora o ensaio em pulso costume apresentar maior sensibilidade experimental. Conforme esperado, ambos os ensaios apresentaram os mesmos resultados finais. Também foram avaliados os traçadores empregados nos dois tipos de ensaios estímulo-resposta, pulso e degrau. Foram empregados três traçadores diferentes - verde de bromocresol, azul de bromofenol e eosina Y que proporcionaram curvas com diferentes características. Como ferramenta auxiliar da modelação foram estudas a determinação das curvas DTR experimentais com auxílio de duas técnicas distintas. Para calibrar o modelo matemático proposto foram utilizados dados de reatores em escala de bancada com diferentes configurações submetidas a variações de vazões afluentes. Os dados de um reator UASB em escala piloto - submetido a variações cíclicas de vazão afluente de 40 e 60% - foram empregados para calibrar e verificar o modelo matemático proposto. Os resultados encontrados com o modelo matemático proposto nesta pesquisa demonstraram que a variação de vazão afluente não deve ser negligenciada. O modelo utilizado representou adequadamente o reator UASB. Seus resultados, quando comparados aos modelos matemáticos que não consideram a variação de vazão, mostraram que para flutuações de vazão elevadas, vazões com valores até 60% maiores do que a vazão média, os valores dos coeficientes de difusão diferem significativamente em função das hipóteses empregadas no desenvolvimento do modelo matemático.Mathematical models for hydrodynamic characteristics evaluation of reactors are commonly used however there is a lack of information in the literature concerning the application of mathematical modeling for non-steady state flow. In this thesis, it is presented a non-steady mathematical model to simulate the hydrodynamic behavior of pipe flow reactors with diffusion in order to evaluate the effect of the variation of the influent flowrate in the hydrodynamic parameters. The simulations were performed considering constant flowrate and volume, variable flowrate and volume and, variable flowrate and constant volume. It was investigated the influence of two types of stimulus-response assays, pulse and step function, on the application of mathematical models and the determination of the experimental retention time distribution curves. Theoretically, both tests should provide the same results although the pulse stimulus assay usually presents higher experimental sensitivity. As it was expected, both tests presented the same final results. The tested tracers were also evaluated in relation to the pulse and step stimulus-response tests. Three tracers were tested (bromocresol green, bromophenol blue and eosin Y) and it was shown that they provided different curves. It was studied the construction of the experimental retention time distribution curves using two procedures as an auxiliary tool for modeling. The proposed mathematical model was calibrated with data of bench scale reactors submitted to different cyclical variations of flowrates. Moreover, data of UASB reactor in pilot scale - submitted to 40 and 60% of cyclical variations of flowrates were utilized to calibrate and verify the obtained mathematical model. The results found with the mathematical model proposed in this research showed that the variations in influent flow rate can not be neglected. The model adequately represented a pilot scale UASB reactor. The results showed that the diffusion coefficients differ significantly for high flowrate fluctuations, when compared to other mathematical models that do not incorporate variable flowrate, depending upon the hypothesis used to derive the model.
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Goldar, Davila Alejandro. "Low-complexity algorithms for the fast and safe charge of Li-ion batteries." Doctoral thesis, Universite Libre de Bruxelles, 2021. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/320077.
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This thesis proposes, validates, and compares low-complexity algorithms for the fast-and-safe charge and balance of Li-ion batteries both for the single cell case and for the case of a serially-connected string of battery cells. The proposed algorithms are based on a reduced-order electrochemical model (Equivalent Hydraulic Model, EHM), and make use of constrained-control strategies to limit the main electrochemical degradation phenomena that may accelerate aging, namely: Lithium plating in the anode and solvent oxidation inthe cathode. To avoid the computational intensiveness of solving an online optimization as in the Model Predictive Control (MPC) framework, this thesis proposes the use of Reference Governor schemes. Variants of both the Scalar Reference Governors (SRG) and the Explicit Reference Governors (ERG) are developed to deal with the non-convex admissible region for the charge of a battery cell, while keeping a low computational burden. To evaluate the performance of the proposed techniques for the single cell case, they are experimentallyvalidated on commercial Turnigy LCO cells of 160 mAh at four different constant temperatures (10, 20, 30 and 40 °C). In the second part of this thesis, the proposed charging strategies are extended to take into account the balance of a serially-connected string of cells. To equalize possible mismatches, a centralized policy based on a shunting grid (active balance) connects or disconnects the cells during the charge. After a preliminary analysis, a simple mixed-integer algorithm was proposed. Since this method is computationally inefficient due to the high number of scenarios to be evaluated, this thesis proposes a ratio-based algorithm based on a Pulse-Width Modulation (PWM) approach. This approach can be used within both MPC and RG schemes. The numerical validations of the proposed algorithms for the case of a string of four battery cells are carried out using a simulator based on a full-order electrochemical model. Numerical validations show that the PWM-like approach charges in parallel all the cells within the pack, whereas the mixed-integer approach charges the battery cells sequentially from the battery cell with the lowest state of charge to the ones with the highest states of charge. On the basis of the simulations, an algorithm based on a mixed logic that allows to charge in a “sequential parallel” approach is proposed. Some conclusions and future directions of research are proposed at the end of the thesis.Doctorat en Sciences de l'ingénieur et technologie
info:eu-repo/semantics/nonPublished
Book chapters on the topic "Hydraulic puller"
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"hydraulic pipe puller." In Dictionary Geotechnical Engineering/Wörterbuch GeoTechnik, 698. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41714-6_81819.
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Nor, Amos, and Joseph Walder. "Chapter 19 Hydraulic Pulses in the Earth's Crust." In International Geophysics, 461–73. Elsevier, 1992. http://dx.doi.org/10.1016/s0074-6142(08)62834-x.
Full textConference papers on the topic "Hydraulic puller"
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Kumar, Morrish, Santosh Madeva Naik, Dulgach Rahul, and S. N. S. Santhosh Kumar. "Design modification in hydraulic puller for increased efficiency for dismounting TTC coupling." In SEVENTH INTERNATIONAL SYMPOSIUM ON NEGATIVE IONS, BEAMS AND SOURCES (NIBS 2020). AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0058136.
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Gradl, Christoph, and Rudolf Scheidl. "A Basic Study on the Response Dynamics of Pulse-Frequency Controlled Digital Hydraulic Drives." In ASME/BATH 2013 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/fpmc2013-4438.
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Various control strategies in digital hydraulics have been proposed and studied so far. In hydraulic switching control Pulse Width Modulation (PWM) of one or two switching valves was mostly considered. This paper deals with Pulse Frequency Control (PFC) which — opposite to PWM — uses the pulse repeating frequency and not the pulse width as control input. PFC may be to be preferred if the hydraulic switching device can realize a very particular pulse in a quite favorable way. This paper studies the influences of the flow rate pulse shapes and of the pulse frequency on the overall system dynamics. Based on a dimensionless mathematical model of a simple linear hydraulic drive and on elementary performance requirements (e.g. overshooting and pressure pulsations) dimensioning rules are derived. In addition to a repeated pulsing single or just a few pulses are investigated. It turns out that particular single or twin pulses can realize stepping motions of the drive without subsequent pulsations. In this way a hydraulic stepping drive can be realized. In case of repeated pulsing, high pulsing frequencies, in particular frequencies well above the natural frequency of the drive system, reduce oscillations considerably. Such frequencies may be realized either by one high frequency pulse device or by several pulse devices which are arranged in parallel and are operated in a phase shifted mode.
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Endres, Derek, and Sandip Mazumder. "Numerical Investigation of Pulsed Chemical Vapor Deposition of Aluminum Nitride to Reduce Particle Formation." In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-65925.
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Particles of aluminum nitride (AlN) have been observed to form during epitaxial growth of AlN films by metal organic chemical vapor deposition (MOCVD). Particle formation is undesirable because particles do not contribute to the film growth, and are detrimental to the hydraulic system of the reactor. It is believed that particle formation is triggered by adducts that are formed when the group-III precursor, namely tri-methyl-aluminum (TMAl), and the group-V precursor, namely ammonia (NH3), come in direct contact in the gas-phase. Thus, one way to eliminate particle formation is to prevent the group-III and the group-V precursors from coming in direct contact at all in the gas-phase. In this article, pulsing of TMAl and NH3 is numerically investigated as a means to reduce AlN particle formation. The investigations are conducted using computational fluid dynamics (CFD) analysis with the inclusion of detailed chemical reaction mechanisms both in the gas-phase and at the surface. The CFD code is first validated for steady-state (non-pulsed) MOCVD of AlN against published data. Subsequently, it is exercised for pulsed MOCVD with various pulse widths, precursor gas flow rates, wafer temperature, and reactor pressure. It is found that in order to significantly reduce particle formation, the group-III and group-V precursors need to be separated by a carrier gas pulse, and the carrier gas pulse should be at least 5–6 times as long as the precursor gas pulses. The studies also reveal that with the same time-averaged precursor gas flow rates as steady injection (non-pulsed) conditions, pulsed MOCVD can result in higher film growth rates because the precursors are incorporated into the film, rather than being wasted as particles. The improvement in growth rate was noted for both horizontal and vertical reactors, and was found to be most pronounced for intermediate wafer temperature and intermediate reactor pressure.
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Endres, Derek, and Sandip Mazumder. "Computational Study of Pulsed Metal-Organic Chemical Vapor Deposition of Aluminum Nitride." In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-65525.
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Particles of aluminum nitride (AlN) have been observed to form during epitaxial growth of AlN films by metal organic chemical vapor deposition (MOCVD). Particle formation is undesirable because particles do not contribute to the film growth, and are detrimental to the hydraulic system of the reactor. It is believed that particle formation is triggered by adducts that are formed when the group-III precursor, namely tri-methyl-aluminum (TMAl), and the group-V precursor, namely ammonia (NH3), come in direct contact in the gas-phase. Thus, one way to eliminate particle formation is to prevent the group-III and the group-V precursors from coming in direct contact at all in the gas-phase. In this article, pulsing of TMAl and NH3 is numerically investigated as a means to reduce AlN particle formation. The investigations are conducted using computational fluid dynamics (CFD) analysis with the inclusion of detailed chemical reaction mechanisms both in the gas-phase and at the surface. The CFD code is first validated for steady-state (non-pulsed) MOCVD of AlN against published data. Subsequently, it is exercised for pulsed MOCVD with various pulse widths, precursor gas flow rates, wafer temperature, and reactor pressure. It is found that in order to significantly reduce particle formation, the group-III and group-V precursors need to be separated by a carrier gas pulse, and the carrier gas pulse should be at least 5–6 times as long as the precursor gas pulses. The studies also reveal that with the same time-averaged precursor gas flow rates as steady injection (non-pulsed) conditions, pulsed MOCVD can result in higher film growth rates because the precursors are incorporated into the film, rather than being wasted as particles. The improvement in growth rate was noted for both horizontal and vertical reactors, and was found to be most pronounced for intermediate wafer temperature and intermediate reactor pressure.
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Rohatgi, Aashish, Elizabeth V. Stephens, Richard W. Davies, and Mark T. Smith. "An Investigation of Sheet Metal Deformation Behavior During Electro-Hydraulic Forming (EHF)." In ASME 2013 International Manufacturing Science and Engineering Conference collocated with the 41st North American Manufacturing Research Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/msec2013-1129.
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This work describes recent advances in our understanding of sheet metal behavior during electro-hydraulic forming (EHF) process. Two sets of experiments were performed using AA5182-O Al sheet material. In the first set, 1 mm thick sheet samples were subjected to a single pressure-pulse or two consecutive pressure-pulses with the deformation being carried out under free-forming or inside a conical die. In the second set of experiments employing 2 mm sheet samples, a circular region at the center of the sheet was pre-thinned to 1 mm thickness and the sheet was subjected to a single pressure-pulse under free-forming conditions. The sheet deformation history for both sets of experiments was quantified using a recently developed technique that combines high-speed imaging and the digital image correlation (DIC) techniques. The results from the first set of experiments show that the manner in which the discharge is created can influence the strain-rates and hence, the deformation history experienced by the sheet materials. The results of the multi-pulse experiments demonstrate the applicability of the EHF technique for re-strike operations. The results from the second set of experiments show that the pre-thinned region is analogous to a reduced gauge section with the resulting strain-rate (in the pre-thinned region) exceeding that in the adjacent homogeneous sheet by more than 50%.
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Rezaei, Ali, Fahd Siddiqui, Nicole Callen, Peter Gordon, Waylon House, and Mohamed Soliman. "Pulsed Power Plasma to Enhance Near Wellbore Permeability and Improve Well Performance." In SPE Hydraulic Fracturing Technology Conference and Exhibition. Society of Petroleum Engineers, 2020. http://dx.doi.org/10.2118/199753-ms.
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Schepers, Ingo, Daniel Weiler, and Juergen Weber. "Optimized Pulse Modulation: A Novel Idea of a Digital Control Method for On/Off Valves." In ASME 2011 Dynamic Systems and Control Conference and Bath/ASME Symposium on Fluid Power and Motion Control. ASMEDC, 2011. http://dx.doi.org/10.1115/dscc2011-6007.
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This article describes how on/off valves can be used in the closed loop control. After studying different industrial hydraulic applications typical requirements will be compiled. From these requirements a basic on/off valve architecture will be derived. In this article the number of parallel connected on/off valves per control edge is limited to one valve. So the typical digital hydraulics with a high number of parallel connected valves is not considered. The on/off valves could not be controlled like normal directional valves. To control on/off valves digital control methods are common to use. The digital control methods are not optimized for the hydraulic on/off valves, because the origins of the digital control methods will be found in the electrical engineering. The novel idea for the digital control methods is the optimized pulse control which eliminates the disadvantages of the common digital control methods. How the optimized pulse control works is described in this article.
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Juarez, Tracy, Caleb Francis, Stephanie Freels, Brian Sinosic, and Kevin Wutherich. "Proppant Placement in the Barnett Shale When Perforations are Selected in Like-Rock." In SPE Hydraulic Fracturing Technology Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/204208-ms.
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Abstract In previous frac designs, proppant tracer logs revealed poor proppant distribution between clusters. In this study, various technologies were utilized to improve cluster efficiency, primarily focusing on selecting perforations in like-rock, adjusting perforation designs and the use of diverters. Effectiveness of the changes were analyzed using proppant tracer. This study consisted of a group of four wells completed sequentially. Sections of each well were divided into completion design groups characterized by different perforating methodologies. Perforation placement was primarily driven by RockMSE (Mechanical Specific Energy), a calculation derived from drilling data that relates to a rock's compressive strength. Additionally, the RockMSE values were compared alongside three different datasets: gamma ray collected while drilling, a calculation of stresses from accelerometer data placed at the bit, and Pulsed Neutron Cross Dipole Sonic log data. The results of this study showed strong indications that fluid flow is greatly affected by rock strength as mapped with the RockMSE, with fluid preferentially entering areas with low RockMSE. It was found that placing clusters in similar rock types yielded an improved fluid distribution. Additional improved fluid distribution was observed by adjusting hole diameter, number of perforations and pump rate.
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Seporaitis, Marijus, Raimondas Pabarcius, and Kazys Almenas. "Study of Controlled Condensation Implosion Events." In 10th International Conference on Nuclear Engineering. ASMEDC, 2002. http://dx.doi.org/10.1115/icone10-22448.
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At LEI (Lithuanian Energy Institute) an experimental program has been initiated to investigate the ‘condensation implosion’ phenomena that can occur for horizontally stratified liquid-vapour flow conditions. The goal is understand the critical boundary conditions sufficiently so that the phenomenon can be controlled and initiated at will. After a reliable ‘pulser’ is developed, the follow up goal is to implement this unique component in a thermal-hydraulic system designed to perform certain tasks, e.g. to pump water or to transport energy passively in a downward direction. Experimental data obtained to data has shown that pulsers can be designed in which the vapour-liquid interface perturbation required for the initiation of condensation implosions is generated internally and depends solely on the rate at which liquid is supplied to the pulser. Data is presented which documents the conditions required for transition from a smooth to a wavy interface, and subsequently to an exponentially increasing surface distortion that culminates in a ‘condensation implosion’. The importance of the shear-stress generated by the condensation rate is illustrated.
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Hong, Shane Y. "A Novel Principle for Automatic Transmission." In ASME 2007 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/detc2007-34005.
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This paper unveils a new principle for automatic transmission, which may greatly simplify the current automatic transmissions and improve their efficiency. Unlike traditional automatic transmission based on torque converter/planetary gears, automatic transmission systems based on V-belt variable speed drive, or traditional transmission with electrical control, this new approach does not rely on the gear ratio or radii of the driving and driven wheel to change the speed ratio. The speed change in the new approach is achieved by an elastic belt on two fixed-diameter pulleys. The belt elongates in proportion to the load applied, and the driving pulley of fixed diameter has to rotate more to accommodate the increased length of the belt due to the load increase, consequently reduces the speed of driven pulley. This self-sensing, self-adjusting, and fully automatic drive system is pure mechanical without the need of electrical or hydraulic control. Based on this novel kinematic principle, the simplest automatic transmission in the world may be designed, manufactured, and used.
Reports on the topic "Hydraulic puller"
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Estimation of hydraulic characteristics in the Santa Fe Group aquifer system using computer simulations of river and drain pulses in the Rio Bravo study area, near Albuquerque, New Mexico. US Geological Survey, 2001. http://dx.doi.org/10.3133/wri014069.
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