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Journal articles on the topic "Fans (Machinery) Computer simulation"
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Bakhtiari, Hossein, Jan Akander, Mathias Cehlin, and Abolfazl Hayati. "On the Performance of Night Ventilation in a Historic Office Building in Nordic Climate." Energies 13, no. 16 (August 11, 2020): 4159. http://dx.doi.org/10.3390/en13164159.
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The effect of mechanical night ventilation on thermal comfort and electricity use for cooling of a typical historic office building in north-central Sweden was assessed. IDA-ICE simulation program was used to model the potential for improving thermal comfort and electricity savings by applying night ventilation cooling. Parametric study comprised different outdoor climates, flow rates, cooling machine’s coefficient of performance and ventilation units’ specific fan power values. Additionally, the effect of different door schemes (open or closed) on thermal comfort in offices was investigated. It was shown that night ventilation cannot meet the building’s total cooling demand and auxiliary active cooling is required, although the building is located in a cold climate. Night ventilation had the potential in decreasing the percentage of exceedance hours in offices by up to 33% and decreasing the total electricity use for cooling by up to 40%. More electricity is saved with higher night ventilation rates. There is, however, a maximum beneficial ventilation rate above which the increase in electricity use in fans outweighs the decrease in electricity use in cooling machine. It depends on thermal mass capacity of the building, cooling machine´s coefficient of performance, design ventilation rate, and available night ventilation cooling potential (ambient air temperature).
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Son, Ickjin, Grace Firsta Lukman, Mazahir Hussain Shah, Kwang-Il Jeong, and Jin-Woo Ahn. "Design Considerations and Selection of Cost-Effective Switched Reluctance Drive for Radiator Cooling Fans." Electronics 10, no. 8 (April 12, 2021): 917. http://dx.doi.org/10.3390/electronics10080917.
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Switched reluctance motors (SRMs) are simple in structure, easy to manufacture, magnet-less, brushless, and highly robust compared to other AC motors which makes them a good option for applications that operate in harsh environment. However, the motor has non-linear magnetic characteristics, and it comes with various pole-phase combinations and circuit topologies that causes many difficulties in deciding on which type to choose. In this paper, the viability of SRM as a low-cost, rugged machine for vehicle radiator cooling fan is considered. First, necessary design considerations are presented, then three commonly use types of SRM are analyzed: A 3-phase 6/4, 3-phase 12/8, and a 4-phase 8/6 to find their static and dynamic characteristics so the most suitable type can be selected. Simulation results show that the 8/6 SRM produces the highest efficiency with less phase current which reduces the converter burden. However, with asymmetric half bridge converter, eight power switches are required for 8/6 SRM and thus put a burden on the overall drive cost. As a solution, the Miller converter with only six switches for four phase SRM. To verify the proposed idea, the 8/6 SRM was manufactured and tested. The results show that Miller converter can be used for the proposed SRM with slightly reduced efficiency at 80.4%.
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Cornetta, Gianluca, Francisco Javier Mateos, Abdellah Touhafi, and Gabriel-Miro Muntean. "Modelling and Simulation of a Cloud Platform for Sharing Distributed Digital Fabrication Resources." Computers 8, no. 2 (June 12, 2019): 47. http://dx.doi.org/10.3390/computers8020047.
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Fabrication as a Service (FaaS) is a new concept developed within the framework of the NEWTON Horizon 2020 project. It is aimed at empowering digital fabrication laboratories (Fab Labs) by providing hardware and software wrappers to expose numerically-controlled expensive fabrication equipment as web services. More specifically, FaaS leverages cloud and IoT technologies to enable a wide learning community to have remote access to these labs’ computer-controlled tools and equipment over the Internet. In such context, the fabrication machines can be seen as networked resources distributed over a wide geographical area. These resources can communicate through machine-to-machine protocols and a centralized cloud infrastructure and can be digitally monitored and controlled through programmatic interfaces relying on REST APIs. This paper introduces FaaS in the context of Fab Lab challenges and describes FaaS deployment within NEWTON Fab Labs, part of the NEWTON European Horizon 2020 project on technology enhanced learning. The NEWTON Fab Labs architecture is described in detail targeting software, hardware and network architecture. The system has been extensively load-tested simulating real use-case scenarios and it is presently in production. In particular, this paper shows how the measured data has been used to build a simulation model to estimate system performance and identify possible bottlenecks. The measurements performed show that the platform delays exhibit a tail distribution with Pareto-like behaviour; this finding has been used to build a simple mathematical model and a simulator on top of CloudSim to estimate the latencies of the critical paths of the NEWTON Fab Lab platform under several load conditions.
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Kang, Hyoung Seok, Sang Do Noh, Ji Yeon Son, Hyun Kim, Jun Hee Park, and Ju Yeon Lee. "The FaaS system using additive manufacturing for personalized production." Rapid Prototyping Journal 24, no. 9 (November 12, 2018): 1486–99. http://dx.doi.org/10.1108/rpj-11-2016-0195.
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PurposeIn this paper, a three-dimensional (3D) printer-based manufacturing line and supporting system, which supports personalized/customized manufacturing for individual businesses or start-up companies, was studied to evaluate the practicality of using additive manufacturing for personalization/mass customization.Design/methodology/approachFirst, factory-as-a-service (FaaS) system, which provides factory as a service to customers, was proposed and designed to manufacture various products within a distributed manufacturing environment. This system includes 3D printer-based material extrusion processes, vapor machine/computer numerical control machines as post-processes and assembly and inspection processes with an automated material handling robot in the factory. Second, a virtualization module for the FaaS factory was developed using a simulation model interfaced with a cloud-based order and production-planning system and an internet-of-things-based control and monitoring system. This is part of the system for manufacturing operations, which is capable of dynamic scheduling in a distributed manufacturing environment. In addition, simulation-based virtual production was conducted to verify and evaluate the FaaS factory for the target production scenario. Main information of the simulation also has been identified and included in the virtualization module. Finally, the established system was applied in a sample production scenario to evaluate its practicality and efficiency.FindingsAdditive manufacturing is a reliable, feasible and applicable technology, and it can be a core element in smart manufacturing and the realization of personalization/mass customization.Originality/valueVarious studies on additive manufacturing have been conducted with regard to replacing the existing manufacturing methods or integrating with them, but these studies mostly focused on materials or types of additive manufacturing, with few advanced or applied studies on the establishment of a new manufacturing environment for personalization/mass customization.
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Earles, L. L., A. B. Palazzolo, C.-K. Lee, and C. H. Gerhold. "Hybrid Finite Element—Boundary Element Simulation of Rotating Machinery Supported on Flexible Foundation and Soil." Journal of Vibration and Acoustics 110, no. 3 (July 1, 1988): 300–306. http://dx.doi.org/10.1115/1.3269517.
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Relative and absolute shaft vibration data have revealed that the commonly made assumption of rigidly supported bearings may be grossly inaccurate, especially for fans, generator sets, and natural gas transmission compressors. This paper provides a systematic method for modeling flexibly mounted rotating machinery utilizing 8 node isoparametric brick-type finite elements for the foundation and 4 node isoparametric “patch” type boundary elements for the soil. The rotor is modeled utilizing Euler-Bernoulli beam elements and includes disk gyroscopics and cross coupled bearing coefficients. The large number of degrees of freedom included in the model are reduced utilizing a nested superelement scheme and Guyan reduction.
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Kikitsu, Hitomitsu, Jun Kanda, and Ryoji Iwasaki. "Flow simulation by wind tunnel with computer-controlled multiple fans." Journal of Wind Engineering and Industrial Aerodynamics 83, no. 1-3 (November 1999): 421–29. http://dx.doi.org/10.1016/s0167-6105(99)00090-2.
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R. S. Parmar, R. W. McClendon, and E. J. Williams. "A Computer Simulation Model for Peanut Machinery Management." Applied Engineering in Agriculture 10, no. 4 (1994): 455–61. http://dx.doi.org/10.13031/2013.25875.
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Harun, Zambri, Muhammad Saiful bin Sahari, and Taib Iskandar Mohamad. "Smoke Simulation in an Underground Train Station Using Computational Fluid Dynamic." Applied Mechanics and Materials 663 (October 2014): 366–72. http://dx.doi.org/10.4028/www.scientific.net/amm.663.366.
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The design of the ventilation and fire safety systems for the Johor Bahru Sentral, a semi-underground train station, part of the Integrated Custom, Immigration and Quarantine Complex (ICIQ) is based on normal Malaysian Standards (MS), British Standards and the local fire department’s requirements. However, the large and complex space in the underground station coupled with scheduled diesel-powered locomotives which frequent the station by stopping or passing require detailed simulations. Both ventilation and the fire safety systems employ Computational Fluid Dynamic (CFD) methods to provide realistic balance against the typical calculations based on spread sheets and certain design software. This study compares smoke simulations results performed by the mechanical and fire consultants with the simulations carried out through this project. An assumption of a locomotive catches fire near the main platform is made. The burning locomotive is the source of the smoke while the occupants on platforms and waiting areas are the subjects to escape safely. The process of the simulation includes modelling and meshing processes on the structure of the railway station imported from Inventor CAD Autodesk software drawing. The CFD simulations are performed using Star-CCM+. The smokes flow around the building with buoyancy forces and extracted via exhaust fans. Through these simulations, we found that when a locomotive catches fire, the passengers could evacuate the building safely before the fire department machinery arrives. Furthermore, we notice that the ventilation fans activation based on detection of hazardous gases may not be efficient way to remove the latter. A schedule clean-up sync with train arrivals effectively removes toxic gas.
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Burley, Roger, and John R. Flower. "Dynamic behaviour of dyeing machinery and computer simulation - some examples." Journal of the Society of Dyers and Colourists 107, no. 12 (October 22, 2008): 434–38. http://dx.doi.org/10.1111/j.1478-4408.1991.tb01293.x.
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Richard, M. J., I. Bindzi, and C. M. Gosselin. "A Topological Approach to the Dynamic Simulation of Articulated Machinery." Journal of Mechanical Design 117, no. 1 (March 1, 1995): 199–202. http://dx.doi.org/10.1115/1.2826107.
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This article presents a method for deriving the equations describing the motion of tree-structured mechanical systems of n rigid bodies linked to one another by spherical, universal and/or rotational joints. The dynamic and kinematic equations are formulated on the basis of the vector-network model. The vector-network approach is a mathematical model for the systematic development of nonlinear equations describing the motion of a system of rigid bodies interconnected by kinematic joints. The entire procedure of the vector-network is an application of the basic concepts of graph theory in which laws of dynamics have been integrated.
Dissertations / Theses on the topic "Fans (Machinery) Computer simulation"
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Thiart, G. D. "A numerical procedure for predicting the effects of distorted inflow conditions on the performance of axial flow fans." Thesis, Stellenbosch : University of Stellenbosch, 1991. http://hdl.handle.net/10019.1/5747.
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Thesis (PhD (Mechanical Engineering))--University of Stellenbosch, 1990.Leaves printed on single pages, preliminary pages i- viii and numbered pages 1-1-R5. Includes bibliography, list of tables and figures and list of appendices. Digitized at 330 dpi black and white PDF format (OCR),using KODAK i 1220 PLUS scanner.
ENGLISH ABSTRACT: A numerical procedure for predicting the effect of inlet flow distortions on the performance of axial flow fans is proposed. The study is aimed specifically at fans of low solidity and low hub-to-tip ratios, which have attained some importance with the advent of large directly air-cooled power stations in certain arid regions of the world. The numerical model is an extension to cylindrical polar coordinates of the SIMPLEN algorithm that has been developed by the author previously. The algorithm is implemented in a computer code, FLOVAX, which solves the incompressible Navier-Stokes equations, augmented by the k-Ɛ model of turbulence, on a computational domain that is aligned with the cylindrical polar coordinate system. Several relatively simple flow problems are solved to verify the code: laminar stagnation flow, laminar flow near a rotating disk, turbulent flow near a propeller, turbulent flow through an abrupt axisymmetric expansion, and turbulent swirling flow in an annulus. Good agreement is obtained between the numerical solutions and the corresponding analytical, empirical or published experimental and numerical results. Some experimental results are also presented: measurements of shaft power, volume flow rate and static pressure rise were taken in a setup comprising an axial flow fan mounted in the wall of a wind tunnel. The wind tunnel was used to provide flow across the fan intake, thus establishing distorted inflow conditions. Detailed measurements of the velocity and static pressure distributions in the duct downstream of the fan rotor were also performed. It is clear from the results that flow across the intake of the test fan has a detrimental effect on its performance in that an increased amount of power is necessary to deliver the same flow rate as with no crossflow. In the numerical predictions, blade element theory is used to model the thrust and torque exerted by the fan blades on the air. The numerical results generally confirm the results of the experiment, although the increase in power is underestimated: an increase of only approximately half of the measured increase is predicted. Several recommendations for improvement of the numerical procedure are made.
AFRIKAANSE OPSOMMING: 'n Numeriese prosedure vir die voorspelling van die invloed van versteurings in inlaatvloei op die werking van aksiaalwaaiers word daargestel. Die studie is spesifiek gemik op waaiers van lae soliditeit en lae lempunt-tot-naafverhoudings. Waaiers van hierdie tipe het belangrikheid verwerf sedert die onlangse totstandkoming van groot lugverkoelde kragstasies in sekere droe werelddele. Die numeriese model is 'n uitbreiding na silindriese poolkoordinate van die SIMPLEN-algoritme wat voorheen deur die skrywer ontwikkel is. Die algoritme word geimplementeer in 'n rekenaarkode, FLOVAX, wat die onsamedukbare Navier-Stokes-vergelykings, aangevul deur die k-Ɛ-turbulensiemodel, oplos op 'n berekeningsgebied wat saamval met die silindriese poolkoordinaatstelsel. Verskeie relatief eenvoudige vloeiprobleme word opgelos ter verifikasie van die kode: laminere stagnasievloei, laminere vloei op 'n roterende skyf, turbulente vloei deur 'n propeller, turbulente vloei deur 'n aksiaalsimmetriese vernouing, en turbulente roterende vloei in 'n annulus. Goeie ooreenstemming tussen die numeriese oplossings en die ooreenstemmende analitiese, empiriese of gepubliseerde eksperimentele en numeriese resultate is verkry. Eksperimentele resultate word ook aangebied: metings van asdrywing, volumevloei en statiese drukstyging is geneem in 'n opstelling wat bestaan het uit 'n aksiaalwaaier wat in die wand van 'n windtonnel gemonteer is. Die windtonnel is gebruik om versteurde-invloei-toestande te genereer in die vorm van dwarsvloei oor die waaier-inlaat. Snelheids- en statiese drukverdelings in die kanaal stroom-af van die waaierrotor is ook gemeet. Dit blyk duidelik uit die resultate dat die dwarsvloei oor die inlaat van die toetswaaier 'n nadelige uitwerking het op die werking daarvan in die opsig dat meer drywing nodig is om dieselfde vloeitempo te handhaaf as wat die geval is sonder dwarsvloei. Vir die numeriese voorspellings word van lem-element-teorie gebruik gemaak om die stukrag en draaimoment wat deur die waaier op die lug uitgeoefen word, te modelleer. Die numeriese resultate bevestig oor die algemeen die eksperimentele resultate, alhoewel die drywingstoename onderskat word met sowat die helfte van die gemete toename. Verskeie aanbevelings ter verbetering van die numeriese prosedure word gemaak.
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Seaton, M. Scot. "Performance measurements, flow visualization, and numerical simulation of a crossflow fan." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03Mar%5FSeaton.pdf.
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Thesis (M.S. in Aeronautical Engineering)--Naval Postgraduate School, March 2003.Thesis advisor(s): Garth V. Hobson, Raymond P. Shreeve. Includes bibliographical references (p. 69-70). Also available online.
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Glover, Peter Benedict Myers. "Computer simulation and analysis methods in the development of the hydraulic ram pump." Thesis, University of Warwick, 1994. http://wrap.warwick.ac.uk/66359/.
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The purpose of this study was primarily to promote the wider deployment of the hydraulic ram pump, and secondarily to provide the technical input into a programme aimed at using hydraulic ram pump technologies for third world development. Hitherto hydraulic ram pump technologies have been restricted by poor understanding of operational parameters, poor performance prediction, and poor design of pumps and installations. In pursuit of greater understanding the work utilised a computer simulation developed by the author as part of a previous research programme. This simulation was then greatly enhanced to provide improved accuracy and functionality. The enhanced simulation was then used to provide significant insight into the operation of a hydraulic ram pump and subsequently used to identify design improvements for the hydraulic ram pump. The simulation was used to investigate operational restrictions on the hydraulic ram, and was ultimately use to develop a model of hydraulic ram pump operation. The model of operation developed by the use of the simulation was computerised and used to predict the performance of hydraulic ram pump installations. This computerised model was then used to provide the most comprehensive design charts yet created for hydraulic ram pump, and was also used in the investigation of operational limits for the device. The study represents: the development of the first detailed simulation of the hydraulic ram pump and the most significant insight to date into the detail of operation of a hydraulic ram pump. The result of the study is the provision of an accurate method of pump calibration, an accurate method of pump performance prediction, and the first comprehensive design charts to be produced for the hydraulic ram pump.
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Le, Roux Frederick Nicolaas. "The CFD simulation of an axial flow fan." Thesis, Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/4344.
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Thesis (MScEng (Mechanical and Mechatronic Engineering))--University of Stellenbosch, 2010.ENGLISH ABSTRACT: The purpose of this project is to investigate the method and accuracy of simulating axial ow fans with three-dimensional axisymmetric CFD models. Two models are evaluated and compared with experimental fan data. Veri cation data is obtained from a prototype fan tested in a facility conforming to the BS 848 standards. The ow eld over the blade surfaces is investigated further with a visualization experiment comprising of a stroboscope and wool tufts. Good correlation is found at medium to high ow rates and recommendations are made for simulation at lower ow rates as well as test guidelines at the fan test facility. The results and knowledge gained will be used to amend currently used actuator disc theory for axial ow fan simulation.
AFRIKAANSE OPSOMMING: Die doel van hierdie projek is om die metode en akkuraatheid om aksiaalvloeiwaaiers met drie-dimensionele BVM modelle te simuleer, te ondersoek. Twee modelle word geëvalueer en met eksperimentele waaiertoetse vergelyk. Veri- kasie data is verkry vanaf 'n prototipe waaier wat in 'n fasiliteit getoets is en wat aan die BS 848 standaarde voldoen. Die vloeiveld oor die lemoppervlaktes word ondersoek met 'n visualisering eksperiment wat uit 'n stroboskoop en wolletjies bestaan. Goeie korrelasie word gevind vir medium tot hoë massavloeie en aanbevelings word gemaak vir die simulasie by laer massavloeie met riglyne vir toetswerk in die toets-fasiliteit. Die resultate en kennis opgedoen sal gebruik word in die verbetering van huidige aksieskyfteorie vir numeriese aksiaalvloeiwaaier simulasies.
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Liu, Haofei. "Numerical simulation of the instabilities of a 2D collapsible channel flow." Thesis, University of Glasgow, 2010. http://theses.gla.ac.uk/1827/.
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Collapsible channel flows that originated from physiological applications have many intriguing dynamic system behaviours. In this thesis, the stability of a two-dimensional collapsible channel flow is studied numerically. Three approaches are adopted to investigate the fluid-structure interaction problem: an in-house Finite Element Method (FE) based Fluid-Beam model (FBM), a commercial FE based code, ADINA, and an eigensolver derived from the FBM (linear analysis). Two types of inlet boundary conditions are considered. One is the flow-driven system where the inlet flow rate is specified, and the other is the pressure-driven where the pressure drop is given. It turns out that these two systems yield very different dynamical features even though the steady solutions are the same. For the flow-driven system, a range of steady solutions are studied with both zero and non-zero initial wall tension by means of both FBM (using initial stress configuration) and ADINA (equipped with both initial strain and initial stress configurations). As expected, the FBM agrees with ADINA when using the initial stress configuration, but not when the initial strain configuration is adopted. This established the importance of the initial configuration. The effects of different wall thicknesses on the steady wall performance have also been shown as significant. Fully-coupled unsteady simulations have also been performed with FBM (Bernoulli-Euler beam) and ADINA (Timoshenko beam) to demonstrate significant influences of modelling assumptions on the dynamical behaviour. In addition to unsteady simulations, linear stability analysis is also carried out to identify the critical parameter values that occur when the system is in the neutrally stable state. Using the faster Fourier transform, the unsteady results are then compared with the linear stability analysis results. Excellent agreements are achieved in terms of frequencies of modes of instabilities. Finally, we focus on the dynamical behaviour of collapsible channel flows in a pressure-driven system, and the differences with those of the flow-driven system (Luo et al. 2008). It is found that the stability structure for the pressure-driven system is no longer cascade as in the flow-driven case. Instead, the mode-1 instability is the dominating unstable mode in the pressure-driven system. In the pressure drop and wall stiffness space, neutrally stable mode-2 curve is completely enclosed by the mode-1 neutral curve, and there is no purely mode-2 unstable solution in the parameter space investigated. Interesting mode-switch is also observed. By analysing the energy budgets at the neutral stable points, we confirmed that in the high tension region (on the upper branch of the mode-1 neutral curve), the stability mechanism is the same as that of Jensen & Heil (2003). Namely, self-excited oscillations can grow by extracting kinetic energy from the mean flow, with exactly two thirds of the net kinetic energy flux dissipated by the dissipations and the remainder balanced by increased dissipation in the mean flow. However, the mechanism doesn’t apply for the lower branch of the mode-1 neutral curve. In addition, energy balance changes further for the mode-2 curves in the flow-driven system. It is clear that different mechanisms are operating in different regions of the parameter space, and for different boundary conditions.
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Wu, Howard Honezern. "LDV measurements and numerical modeling of the turbulent flow in a stirred mixer." Diss., The University of Arizona, 1988. http://hdl.handle.net/10150/184528.
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It is recognized that detailed knowledge of turbulence parameters, as well as velocities, can aid in understanding and modeling mixing rate-dominated phenomena in stirred vessels. Measurements using a laser-Doppler velocimeter and modeling using a k-ε turbulence model and FLUENT, a general-purpose fluid flow modeling program, have been conducted of the flow in a baffled, turbine-agitated vessel. The complex flow patterns and high turbulence intensities explain why flows in stirred vessels are difficult to attack experimentally or numerically. In the measurements, the necessary corrections for the periodic, nondissipative velocity fluctuations in the near-impeller region, which were caused by the periodic passage of the impeller blades, were made by an autocorrelation method. With the contributions of the periodic fluctuations removed, meaningful turbulence data including turbulence intensities, autocorrelation functions, turbulence energy spectra, turbulence scales, and turbulence energy dissipation rates were obtained. Integral scales and energy dissipation rates were a particular objective in this work because of their usefulness in modeling local mixing rates in turbulent flows. An energy balance around a region containing the impeller and the impeller stream showed that 60% of the energy transmitted into the vessel via the impeller was dissipated in the region, and 40% was dissipated in the rest of the vessel. An equation for calculating local energy dissipation rates ε from total turbulence energy and resultant integral scales, ε = A q³/² /L(res), appeared adequate with constant A = 0.85 (where q ≡ uᵢuᵢ/2, L(res) ≡√LᵢLᵢ, and uᵢ and Lᵢ are, respectively, the i-th component of fluctuation velocity and the turbulence integral scale measured in direction i). Both the k-ε model (two-dimensional) and FLUENT (which employed three-dimensional k-ε and Reynolds stress models) obtained mean velocity profiles fairly close to the experimental data, but both predicted k and ε significantly lower than the measured values. The reason for the underestimation of k and ε was not entirely clear, but may have been caused by use of only the random parts of velocities for computing k and ε at the impeller boundary. The objective of modeling complex turbulent flows in stirred vessels has been accomplished, a goal which until recently would have been considered beyond the possibility of computation.
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Tang, Kuo-Chiang. "Development of computer simulation package for a stirling cryocooler with multiple expansion stages." Ohio : Ohio University, 1992. http://www.ohiolink.edu/etd/view.cgi?ohiou1173276031.
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CIONE, FRANCISCO C. "Medidas de tensões residuais por extensiometria em componentes usados no setor da mobilidade." reponame:Repositório Institucional do IPEN, 2012. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10163.
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Dissertação (Mestrado)
IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
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Wang, Ying. "High volume conveyor sortation system analysis." Diss., Available online, Georgia Institute of Technology, 2006, 2006. http://etd.gatech.edu/theses/available/etd-05122006-110242/.
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Thesis (Ph. D.)--Industrial and Systems Engineering, Georgia Institute of Technology, 2007.Yorai Wardi, Committee Member ; Gunter Sharp, Committee Member ; Spiridon Reveliotis, Committee Member ; Leon F. McGinnis, Committee Member ; Chen Zhou, Committee Chair.
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Menk, Alexander. "Simulation of complex microstructural geometries using X-FEM and the application to solder joint lifetime prediction." Thesis, University of Glasgow, 2011. http://theses.gla.ac.uk/2519/.
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In electronic devices solder joints form a mechanical as well as an electrical connection between the circuit board and the component (e.g. a chip or a resistor). Temperature variations occurring during field use cause crack initiation and crack growth inside the joints. Accurate prediction of the lifetime requires a method to simulate the damage process based on microstructural properties. Numerical simulation of developing cracks and microstructural entities such as grain boundaries and grain junctions gives rise to several problems. The solution contains strong and weak discontinuities as well as weak singularities. To obtain reasonable solutions with the finite element method (FEM) the element edges have to align with the cracks and the grain boundaries, which imposes geometrical restrictions on the mesh choice. Additionally, a large number of elements has to be used in the vicinity of the singularities which increases the computational effort. Both problems can be circumvented with the extended finite element method (X-FEM) by using appropriate enrichment functions. In this thesis the X-FEM will be developed for the simulation of complex microstructural geometries. Due to the anisotropy of the different grains forming a joint and the variety of different microstructural configurations it is not always possible to write the enrichment functions in a closed form. A procedure to determine enrichment functions numerically is explained and tested. As a result, a very simple meshing scheme, which will be introduced here, can be used to simulate developing cracks in solder joint microstructures. Due to the simplicity of the meshing algorithm the simulation can be automated completely. A large number of enrichment functions must be used to realize this. Well-conditioned equation systems, however, cannot be guaranteed for such an approach. To improve the condition number of the X-FEM stiffness matrix and thus the robustness of the solution process a preconditioning technique is derived and applied. This approach makes it possible to develop a new and fully automated procedure for addressing the reliability of solder joints numerically. The procedure relies on the random generation of microstructures. Performing crack growth calculations for a series of these structures makes it possible to address the influence of varying microstructures on the damage process. Material parameters describing the microstructure are determined in an inverse procedure. It will be shown that the numerical results correspond well with experimental observations.
Books on the topic "Fans (Machinery) Computer simulation"
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1963-, Chen Meng-Jen, ed. Three-phase electrical machine systems: Computer simulation. Taunton, Somerset, England: Research Studies Press, 1993.
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Dynamic simulation of electric machinery: Using MATLAB/SIMULINK. Upper Saddle River, N.J: Prentice Hall PTR, 1998.
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Meer, Jakob Stefanus van der Meer. Simulation of a refrigerant evaporator. Delft: Werktuigkundig Ingenieur, 1987.
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Ward, Shane M. Computer modelling in agricultural mechanisation. Dublin, Ireland: Boole Press, 1985.
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Schiffbauer, William H. A testbed for autonomous mining machine experiments. Washington, DC: U.S. Dept. of the Interior, 1988.
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Siegenthaler, Marcel. Computersimulation fuer die Entwicklung von Automationssystemen in der Spinnerei. [Zürich: Eidgenössische Technische Hochschule Zürich, 1992.
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Shostak, V. P. Immitat͡s︡ionnoe modelirovanie sudovykh ėnergeticheskikh ustanovok. Leningrad: "Sudostroenie", 1988.
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Schiffbauer, William H. A testbed for autonomous mining machine experiments. Pittsburgh, PA: U.S. Dept. of the Interior, Bureau of Mines, 1988.
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Response analysis of A. C. electrical machines: Computer models and simulation. Somerset, England: Research Studies, 1990.
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Ambrose, Dean H. Three-dimensional graphics simulator for testing mine machine computer-controlled algorithms: Phase 1, development. Washington, D.C: U.S. Dept. of the Interior, Bureau of Mines, 1992.
Find full textBook chapters on the topic "Fans (Machinery) Computer simulation"
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Molinero, Daniel, Sergio Galván, Jesús Pacheco, and Nicolás Herrera. "Multi GPU Implementation to Accelerate the CFD Simulation of a 3D Turbo-Machinery Benchmark Using the RapidCFD Library." In Communications in Computer and Information Science, 173–87. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-38043-4_15.
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Abrahams, Athol D., and Melissa Neave. "Biogeochemical Fluxes across Piedmont Slopes of the Jornada Basin." In Structure and Function of a Chihuahuan Desert Ecosystem. Oxford University Press, 2006. http://dx.doi.org/10.1093/oso/9780195117769.003.0011.
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This chapter is an overview of recent studies of the movement of water, sediment, and nutrients across a principle piedmont slope, or bajada, of the Jornada Basin. Bajadas are extensive, gently sloping surfaces formed by the coalescence of alluvial fans and are a major landscape component of the basin and range province. Over the past four decades a considerable body of research has elucidated the form and function of alluvial fans (Bull 1977; Blair and McPherson 1994; Harvey 1997), but less attention has been paid to bajadas. In particular, the bajadas most neglected are those where channels converge and diverge at irregular intervals downslope. This type of bajada is found at the base of Summerford Mountain, the northernmost peak of the Doña Ana Mountains on the western edge of the Jornada Basin. For convenience, this bajada is hereafter referred to as the Summerford bajada. The research has involved rainfall simulation experiments on small plots, monitoring of two small watersheds on this bajada, and computer modeling of the processes operating in these watersheds and over the bajada as a whole. A detailed understanding of the hydrology and hydraulics of overland flow on this bajada requires a numerical model of the rainfall-runoff process. The objective of this chapter is to detail the model and draw conclusions from model simulations about hydrologic transports of sediment and nutrients across this bajada. Because these piedmonts are important surfaces in this desert (chapter 2) an understanding of their hydrologic and biogeochemical dynamics is crucial to understanding landscape dynamics in the basin and throughout arid regions. Summerford Mountain is a steep-sided, rocky inselberg (i.e., isolated mountain) that rises 380 m above the surrounding bajada to an elevation of 1,780 m. The mountain is composed of monzonite porphyry of Oligocene age (Seager et al. 1976) and has a fringing bajada on its northern and eastern sides. This study focuses on the bajada to the east, which extends 2.5 km to the basin floor at an average gradient of 4%.
Conference papers on the topic "Fans (Machinery) Computer simulation"
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Xie, J., R. S. Amano, and E. K. Lee. "An Evaluation of Simulated Flow and Experimental Study Through an Axial Fan." In ASME 2003 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/detc2003/cie-48252.
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A comprehensive three-dimensional CFD approach and experimental study is developed for a 6-ft diameter commercial axial fan with rotational speed up to 1014 rpm. The use of sophisticated CFD software has made it possible to simulate fluid flow in complex moving geometries found in rotating machinery such as fans, pumps compressors, etc. In this paper, FLUENT is used to study an axial fan performance. Simulations are performed for steady state conditions using an implicitly rotating reference frame for the blades. Experimental studies are also conducted to visualize the flow on fan blade surface by using tuft method. The pressure and velocity distribution in front of the fan and the uncertainty dynamic pressure field measurement are also carried out. Comparisons between CFD simulation results and experimental measurement are found to be reasonable.
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Schmalhorst, C., B. Fluri, and R. Schilling. "Development of an Integrated Design System (IDS) for Hydraulic Machinery." In ASME 2008 9th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2008. http://dx.doi.org/10.1115/esda2008-59362.
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An integrated computer-aided system for the initial design and optimisation of hydraulic machinery components, i.e. bladings of centrifugal pumps and fans as well as of water turbines, is presented. The IDS developed at the Institute of Fluidmechanics consists of an artificial neural network (ANN) for the initial design of components, a finite volume CFD-code based on the Reynolds-averaged Navier-Stokes equations and a finite element based computational structural analysis (CSA) code, as well as of an efficient module for the interactive modification of geometry of components. The design and optimisation process is demonstrated for a Francis turbine runner blading. The process starts with an initial design taken from the ANN which is in the next step analysed by means of our inhouse Navier-Stokes solver NS3D with respect to the performances to be guaranteed. The turbine stage is modelled as a single blade passage of the rotor and a stator blading. The CFD-results may be analysed by tailor-made post-processing. Based on the numerical simulation results the initial design may be interactively improved in an iterative process. The design targets in this stage of the process are efficiency and cavitation behaviour of the runner. Finally, the CFD-results are used as boundary conditions for a steady state CSA simulation yielding the distribution and magnitude of stresses within the runner, especially between the blades and the runner band (shroud). In addition to the time-independant CFD- and CSA-simulations a transient Fluid-Structur-Interaction (FSI) analysis may be simulated taking into account all blade passages in the rotor as well as in the stator. This simulation model yields a much more accurate loading of the structure due to unsteady pressure distributions. In this step the design can be scrutinised with respect to its fatigue resistance. After generating a design satisfying all requirements and boundary conditions the optimised geometry is fed back into the ANN to be used for similar applications. After having carried out design and optimisation processes for a number of characteristic hydraulic machinery a higher level of efficiency and cavitation behaviour may be reached.
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Miclea-Bleiziffer, Mihai, Philipp Epple, Henrik Smith, Matthias Semel, and Antonio Delgado. "Application of an Inverse Cascade Analytical and Numerical Design Method Used in the Design of Axial Fans." In ASME 2011 Turbo Expo: Turbine Technical Conference and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/gt2011-45860.
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This contribution presents an inverse design method for axial flow fans validated by 3-D RANS numerical simulations. It is based on an analytical performance derivation for different free-vortex distributions combined with a mean-line pre-design tool and supported by a new 2-D cascade potential flow computational method. This computes the 2-D planar cascade flow field and the inviscid deflection angle of thin arbitrary shape airfoils at different machine radii followed by a numerical radial integration into a quasi-3-D method. For validation, several fan designs were investigated, showing the influence of important design parameters as well as the potential of the present method by redrafting an industrial fan. The 2-D planar potential cascade code was validated against the Weinig’s coefficient diagram for flat plate and circular arc cascades.
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Vlach, Radek, Robert Grepl, and Cestmir Ondrusek. "Computational and Experimental Simulation of Synchronous Generator Ventilation." In ASME/JSME 2004 Pressure Vessels and Piping Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/pvp2004-2309.
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This project is concerned with computational simulation of air flow in the individual parts of a synchronous machine. FLUENT6 software was used for computational modeling. A model of a machine fan was built, which was used for calculation of ventilation characteristics. Ventilation characteristics were calculated for three ventilator diameters. The aim was to find the operating point for each fan. A model of the asymmetrical inlet to the machine and the distribution of airflow to the stator and rotor was built, which consisted of inlet to machine, axial stator and rotor channels and ten radial channels in the stator packet. A parametric computational model was developed with three main parameters — size of axial stator and rotor channels and size of radial channels. The results of the computer simulation were compared with experimental measurements, which were accomplished on the synchronous generator using a Pitot tube and digital micro manometer.
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Miclea-Bleiziffer, Mihai, Philipp Epple, and Antonio Delgado. "Inverse Analytical and Computational Design Method Applied to a Low Pressure Axial Fan." In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-38614.
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Nowadays precise and reliable tools for designing and optimizing turbomachines have a high impact on industrial and research fields. The design methods of turbomachines follow usually two main paths: direct design, where performances are achieved by iteratively modifying a given geometry, and inverse design where performance characteristics are prescribed and the proper geometry for reaching them is found (usually using analytical methods). Both of these methods are used today in research and development and they are coupled with numerical simulations (CFD) for shorter design cycles. This paper proposes an inverse design approach for low pressure axial fans based upon performance equations, namely the equations for total-to-static pressure and efficiency. To validate our approach we use numerical simulation of the axial fan in a virtual test rig. Combining inverse design with the CFD for its validation offers an integrated approach for improving the design in the development phase. In the first step analytical energy equations are derived for a blade cascade section and then integrated over the blade surface, i.e. from hub to tip radii, providing a dependency of the theoretical performances characteristics such as for the pressure and the efficiency, as a function of the flow-rate, rotating speed and the outer dimensions and blade angles of the machine. The next step computes inversely the main outer dimensions and blade angles of the geometry required for reaching the performance. In the final design step the blade shape is computed inversely using a NACA 4 Digit camber as it will be shown in the paper upon the required blade angles and other constrains of the cascade. The final shape is generated in CAD software-program and then a proper computational grid is generated so that it can be finally simulated with a commercial Navier-Stokes solver for the complete pressure and efficiency characteristics. The aim of this study is to offer general conclusions about the analytical influence of certain geometry parameters on the design and optimization of axial fans of this type. The last step for the proposed design method is typically the experimental validation with prototypes which will be not covered in this study.
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Cui, Zeyu. "A Computer Simulation Algorithm About Traffic Flow." In First International Conference on Information Sciences, Machinery, Materials and Energy. Paris, France: Atlantis Press, 2015. http://dx.doi.org/10.2991/icismme-15.2015.371.
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Kaneko, Kimihisa, and Tsutomu Yamamoto. "Predicting Cooling Fan Noise of Electric Motor Using Compressible Large Eddy Simulation." In ASME-JSME-KSME 2019 8th Joint Fluids Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/ajkfluids2019-4699.
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Abstract This paper describes prediction of aeroacoustics from a rotating machinery fan using compressible Large Eddy Simulation (LES). The fan is installed semi-opened space located between the fan cover and the body of rotating machinery such as a electric motor. The fan distributes air from the fan cover intake onto the cooling fins. The Reynolds number of the rotating fan is 9 × 105; its Mach number is approximately 0.1. Under the low Mach number regime, hybrid computational aeroacoustics (hybrid CAA) method, which is solved turbulent flow and acoustics separately, is generally used. However, we used a direct CAA method because interaction between pressure fluctuation from the turbulence and sound propagation should be considered. For the direct CAA method approach, compressible Navier–Stokes equations are solved. Density is calculated from the ideal gas law. To compute turbulence phenomena, LES is used as the turbulence model. The Dynamic Smagorinsky Model is used for the subgrid scale. The sound propagation speed is approximately 10 times faster than the flow speed. Therefore, the numerical schemes, time step, and computational grids size were evaluated with line sound source in the two-dimensional domain as a fundamental study to determine the numerical schemes. Subsequently we evaluated the sound pressure level with the electric motor fan, which is an experimental structure. Through verification of the direct CAA model, we obtained the following results. (1) The predicted pressure fluctuation spectra show good agreement with the experimentally obtained spectra. Specifically, the blade passing frequency (BPF) and trend of the pressure fluctuation decay in the inertial turbulence subrange were predicted. (2) The predicted sound pressure spectra also show good agreement with BPF. Specifically, the acoustic mode and broadband turbulence noise level were predicted.
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Levermore, David M., and Stephen Derby. "Optimizing Flexibility in a Sugar Packaging System." In ASME 1996 Design Engineering Technical Conferences and Computers in Engineering Conference. American Society of Mechanical Engineers, 1996. http://dx.doi.org/10.1115/96-detc/fas-1360.
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Abstract This paper investigates the optimization of flexibility in production systems. The problems associated with sugar production, at the Sugar Industry of Jamaica, is used as a case study. The lack of flexible packaging machinery is identified as a component of these problems. The paper proceeds to assemble a system capable of effectively accomplishing the packaging of bags of various sizes. A simulation of the system using petri nets is used to validate this project.
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Wang, Peng, Xingxin Li, Jinna Jia, and Yaxiong Zhu. "Fault Cause Description Model: For Training Simulation." In 2016 6th International Conference on Machinery, Materials, Environment, Biotechnology and Computer. Paris, France: Atlantis Press, 2016. http://dx.doi.org/10.2991/mmebc-16.2016.153.
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Zhang, Zhichao, and Longzhen Ye. "Computer simulation of explosion crater in dams with different buried depths of explosive." In ADVANCES IN MATERIALS, MACHINERY, ELECTRONICS II: Proceedings of the 2nd International Conference on Advances in Materials, Machinery, Electronics (AMME 2018). Author(s), 2018. http://dx.doi.org/10.1063/1.5033638.
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