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Добірка наукової літератури з теми "Hydraulic volume mechanical transmission"

Автор: Grafiati

Опубліковано: 30 травня 2022

Оновлено: 31 травня 2022

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Статті в журналах з теми "Hydraulic volume mechanical transmission"

Han, Ying. "Study on Hydraulic System for Full Hybrid Transmission." Applied Mechanics and Materials 607 (July 2014): 495–99. http://dx.doi.org/10.4028/www.scientific.net/amm.607.495.

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Design method of hydraulic system of full hybrid transmission was analyzed. At first, oil volume flow and pressure requirement was confirmed according to the vehicle control strategy. Mechanical gear pump and electric pump were used to supply oil flow for all driving modes. Self-adapted pressure regulation circuit was designed to supply high pressure oil for brake engagement. Structure dimension of valves and cooling orifices was designed by theoretical calculation. Cooling flow can be distributed proportionally among electric motors and planetary gears.

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Karmel, A. M. "Design and Analysis of a Transmission Hydraulic System for an Engine-Flywheel Hybrid-Vehicle." Journal of Dynamic Systems, Measurement, and Control 112, no. 2 (June 1, 1990): 253–60. http://dx.doi.org/10.1115/1.2896133.

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Unlike hydraulic systems of conventional automotive transmissions, the hydraulic system of a hybrid vehicle must cope with large variations of pressure as well as flow. If supplied by traditional pump configurations, either fixed or variable displacement, the system will incur substantial efficiency losses. This paper presents a feasibility study of a dual-pump hydraulic supply system which consists of a low-volume fixed-displacement pump and a high-volume variable-displacement pump. The analysis addresses the dynamic characteristics of this system along with its sensitive design areas.

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Song, Jin Chun, Guan Gan Ren, and Lin Yang. "Design and Simulation of an Energy-Saving Hydraulic Oil Production System." Advanced Materials Research 619 (December 2012): 498–502. http://dx.doi.org/10.4028/www.scientific.net/amr.619.498.

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The study on an advanced equipment of a new pumping unit is presented to satisfy the mining technology demands of large load, long stroke and low pumping speed during petroleum exploitation process. The method of using a full hydraulic system drive rather than the traditional way is adopted to overcome the disadvantages in a traditional oil production equipment such as complex mechanical structure, large volume,many transmissions, low efficiency and high manufacturing cost. In addition, the hydraulic circuit which is made up of an accumulator, a hydraulic motor and two hydraulic pumps is used to realize power recovery for energy saving. The mechanical mathematical model and the hydraulic one of a novel hydraulic oil production mechanism were established and analyzed. Good results are eventually obtained. This equipment has been the national patent.

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Yang, Mingkun, Gexin Chen, Jianxin Lu, Cong Yu, Guishan Yan, Chao Ai, and Yanwen Li. "Research on Energy Transmission Mechanism of the Electro-Hydraulic Servo Pump Control System." Energies 14, no. 16 (August 10, 2021): 4869. http://dx.doi.org/10.3390/en14164869.

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The electro-hydraulic servo pump control system (EHSPCS) is a volume control system that uses a permanent magnet synchronous motor (PMSM) with a fixed displacement pump to directly drive and control the hydraulic cylinder. The energy transmission law of the system is very complicated due to the transformation of electrical, mechanical and hydraulic energy as well as other energy fields, and qualitative analysis of the energy transfer efficiency is difficult. Energy transfer analysis of the EHSPCS under different working conditions and loads is proposed in this paper. First, the energy flow transfer mechanism was analyzed, and the mathematical and energy transfer models of the key components of the system were established to explore the energy characteristic state transition rule. Second, a power bond diagram model was built, its state equation and state matrix were deduced, and a system simulation model was built. Finally, combined with the EHSPCS experimental platform, simulation experiments were carried out on the dynamic position following and steady-state position holding conditions of the system, and the variation rules of the power of each energy characteristic state and the system energy transfer efficiency under different loads were obtained. The research results provide a foundation for the study of power matching and energy-saving mechanism of the EHSPCS.

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Lou, Xi Yin. "Study on Walking System Technology of Crawler Combine Harvester." Advanced Materials Research 1037 (October 2014): 107–10. http://dx.doi.org/10.4028/www.scientific.net/amr.1037.107.

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Crawler combine harvester walking system is various transmission technology are organic and reasonable matching, foster strengths and circumvent weaknesses, complementary drive system so as to achieve the best overall. Stepless speed walking is particularly suitable for complex condition changes, the demand of drive system for a more comprehensive, more comprehensive, objective stepless speed walking in transmission system innovation or seek better performance, and as a mechanical transmission device of the planetary gear has the advantages of small volume transfer large torque, high efficiency. The combination of both realizes stepless transmission, and has the advantages of low speed and high torque. Hydraulic drive system is mainly to achieve stepless speed regulation, commutation, planetary gear drive mainly reduce speed, increase the torque to. Composite transmission mode that can greatly improve the transmission ability, expand the scope of speed adjustment. In fact, combine the stepless variable speed running and control technology can greatly improve the performance of the product, especially the effect on production efficiency, durability, controllability, environment adaptability, green characteristics were significantly.

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Bagarello, Vincenzo, Gaetano Caltabellotta, and Massimo Iovino. "Water transmission properties of a sandy-loam soil estimated with Beerkan runs differing by the infiltration time criterion." Journal of Hydrology and Hydromechanics 69, no. 2 (May 21, 2021): 151–60. http://dx.doi.org/10.2478/johh-2021-0010.

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Abstract The Beerkan method consists of a ponded infiltration experiment from a single ring inserted a small depth into the soil. Fixed, small volumes of water are repeatedly poured into the ring to maintain a quasi-zero head on the soil surface. According to the standard Beerkan infiltration run, a new water volume is poured on the infiltration surface when the previously applied volume has completely infiltrated and the soil surface is entirely exposed to air (ta criterion). However, water could also be applied when the soil exposition to air begins (to criterion) or half the soil surface is exposed to air (tm criterion). The effect of the infiltration time criterion on determination of the water transmission properties of a sandy-loam soil was tested. As compared with the standard ta criterion, the two alternative criteria (to , tm ) yielded higher and/or more variable estimates of soil water transmission properties. The saturated soil hydraulic conductivity, Ks , was the most sensitive property to the infiltration time criterion. However, statistically significant differences for Ks were not practically substantial since they did not exceed a factor of 1.7. Infiltration time effects likely occurred due to differences between ponding depth of water, soil water pressure head gradient, air entrapment and soil mechanical disturbance. The standard ta criterion was suggested for performing a Beerkan experiment in the field since it appears to yield the most reliable estimates of a mean value. However, the to criterion could be considered in dual permeability soils to maintain macropores active. Factors that could appear minor in the context of an experiment can have statistically relevant effects on water transmission properties.

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Jen, Y. M., and C. B. Lee. "Influence of an Accumulator on the Performance of a Hydrostatic Drive with Control of the Secondary Unit." Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering 207, no. 3 (August 1993): 173–84. http://dx.doi.org/10.1243/pime_proc_1993_207_336_02.

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In a secondary control unit system, an accumulator changes the relationship of the pumps and motor from flow coupling to pressure coupling. This change creates several benefits, including energy conservation, increased stability and the ability to change the rotational direction of the hydraulic motor. The accumulator therefore plays an important role because it dominates the overall performance of the secondary control unit system. This paper studies the influence of accumulator volume and precharge gas pressure on the performance of a hydrostatic transmission system in a secondary unit control system. A small test rig of the secondary unit system was set up and a series of experimental studies were run. A mathematical model was derived for simulation purposes. The results reveal that making the volume of the accumulator and the precharge gas pressure as high as possible under permitted circumstances can decrease the fluctuation of working pressure, improve the dynamic performance of speed control and increase the recovery of energy.

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Guo, Meng, Cheng Liu, Qingdong Yan, Wei Wei, and Boo Cheong Khoo. "The Effect of Rotating Speeds on the Cavitation Characteristics in Hydraulic Torque Converter." Machines 10, no. 2 (January 23, 2022): 80. http://dx.doi.org/10.3390/machines10020080.

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Hydraulic torque converter is a kind of high speed rotating machine using viscosity hydraulic oil as working medium, and its internal flow field is very complex. Thereby cavitation can occur easily in the working process, resulting in severe degradation of torque converter performance, noise, vibration and even failure. In order to reveal the effect of rotating speeds on the cavitation characteristics, a full flow passage geometry and a computational fluid dynamics (CFD) model with cavitation were developed to analyze the flow behavior in the torque converter. The results show that cavitation occurs when the speed difference between pump and turbine exceeds 1400 rpm for the basic model torque converter, which could be used as a useful indicator for the occurrence and degree of severity of flow cavitation. The increase of pump rotating speed or the decrease of speed ratio will intensify cavitation, which reduces the hydraulic transmission capacity and efficiency by over 20%, and seriously alters the shape, size, vapor volume fraction and region of cavitation bubbles. In extreme cases, more than 80% of the area on the suction side of the stator blade could be covered by cavitation bubbles. Moreover, the increase of pump rotating speed also changes the critical cavitation number and extends the cavitation range towards high speed ratio conditions not previously affected. These findings can provide guidance on how to choose the operating conditions of the hydraulic torque converter and how to improve its hydrodynamic performance and stability.

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Liu, Hua, Ghaith Arfaoui, Milos Stanic, Laurent Montigny, Thomas Jurkschat, Thomas Lohner, and Karsten Stahl. "Numerical modelling of oil distribution and churning gear power losses of gearboxes by smoothed particle hydrodynamics." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 233, no. 1 (February 23, 2018): 74–86. http://dx.doi.org/10.1177/1350650118760626.

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Sufficient oil supply of all machine elements in gearboxes is usually required to avoid damage during operation. Quite frequently, transmissions are conservatively designed with an oversupply of oil to guarantee operational reliability. An oversupply of oil results in an unnecessarily high amount of oil being kept in motion, which in turn leads to excessive hydraulic gear power losses. In high-speed gearboxes in particular, churning losses can contribute greatly to the total power losses. Further detailed information on the oil distribution in gearboxes is needed in order to increase the efficiency and operational reliability of gearboxes. Computational Fluid Dynamics methods provide a flexible way of investigating oil behaviour in transmissions with almost no restrictions regarding geometry and operating conditions. Generally, there are two main methods of computational fluid dynamics simulation in gearboxes: the traditional finite-volume based method (Eulerian approach) and the mesh-free particle-based method (Lagrangian approach). In this work, a computational fluid dynamics model based on the particle-based smoothed particle hydrodynamics method is built to investigate the oil distribution and churning losses of a dip-lubricated single stage gearbox on an efficiency gear test rig. Results are shown and discussed for different rotational speeds and oil temperatures. The smoothed particle hydrodynamics method provides a high potential of predicting the oil distribution of modern dip-lubricated transmission systems. Comparisons with high-speed camera recordings show good agreement. However, the method shows a need for improvement in churning loss prediction.

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Huang, Chung Neng, Kuo Han Chen, and David T. W. Lin. "Development of an Novel Adaptive Suspension System Based on Ball-Screw Mechanism." Applied Mechanics and Materials 477-478 (December 2013): 128–31. http://dx.doi.org/10.4028/www.scientific.net/amm.477-478.128.

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For the passive and semi-active suspensions are characterized as with constant parameters which cannot cope with time-variant road conditions, the suspension results are difficult to be satisfied. Although, the active ones are better than previous two on suspension performance, until now which are still far from real application for the drawbacks of complicated structure, large volume, costly, and difficult maintenance. Here, Ball Screw (BS) is with the characteristics of smaller volume, precise positioning, and well handling high-speed forward and backward transmissions. Instead of hydraulic or pneumatic mechanisms used for vehicle suspension, BS is adopted to be the main body of the proposed New Adaptive Suspension System (NASS). Besides, in order to overcome the unavoidable time-delay resulted from mechanical or computational operations, the Kalman filter, integrated with suspension controller, is used to estimate the road conditions. The effectiveness and feasibility of this proposal are confirmed through simulation studies.

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Більше джерел

Дисертації з теми "Hydraulic volume mechanical transmission"

Бурлига, Михайло Борисович. "Розвиток методів розрахунку та вибір раціональних схем двопотокових безступінчастих гідрооб'ємно-механічних трансмісій колісних тракторів". Thesis, НТУ "ХПІ", 2017. http://repository.kpi.kharkov.ua/handle/KhPI-Press/35538.

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Дисертація на здобуття наукового ступеня кандидата технічних наук за спеціальністю 05.22.02 – автомобілі та трактори. Національний технічний університет "Харківський політехнічний інститут", Харків, 2017. Дисертація присвячена розвитку методів розрахунку для аналізу робочих параметрів безступінчастих ГОМТ і їх основних елементів ГОП, прогнозуванню техніко-економічних показників машинно-тракторного агрегату для визначення раціональних схемних рішень ГОМТ. Актуальність роботи полягає у необхідності забезпечення конкурентоспроможності вітчизняних тракторів. Здійснено аналіз роботи двопотокових ГОМТ колісних тракторів зарубіжних аналогів. Уточнено на підставі новітніх експериментальних даних щодо втрат і ККД математичну модель об’ємних аксіально-поршневих гідромашин, як основних елементів тракторних ГОМТ. Розроблено алгоритм і обчислювальну процедуру щодо встановлення взаємно однозначної відповідності між робочими параметрами, втратами і ККД ГОП в прямому і зворотному потоках потужності крізь ГОП під час їх роботи у складі двопотокових ГОМТ. Вперше розроблено розрахунково-теоретичну методику і програмну реалізацію з визначення параметрів ГОП, ГОМТ і основних техніко-економічних показників МТА з урахуванням режимів циркуляції потужності, втрат в ГОП, ГОМТ і буксування трактора для аналізу і прогнозування характеристик альтернативних тракторних ГОМТ та наукового обґрунтування найраціональнішої трансмісії для конкретного трактора. Вперше вирішено задачу побудови універсальних характеристик тракторів з ГОМТ і візуалізації робочих параметрів ГОМТ у всьому діапазоні експлуатаційних режимів трактора для порівняння альтернативних схемних рішень ГОМТ і вибору найраціональнішого з них. Побудовано універсальні характеристики першого в Україні трактора ХТЗ-21021 з ГОМТ-1С розробки НТУ "ХПІ" і АТ "ХТЗ". За результатами чисельного і натурного експериментів зроблено висновок, що математичні моделі й запропоновані методики є адекватними і спрямованими на підвищення ефективності та конкурентоспроможності вітчизняних тракторів.
Thesis for Scientific degree of candidate of technical sciences, specialty 05.22.02 – vehicles and tractors. National Technical University "Kharkiv Polytechnic Institute", Kharkiv, 2017. The work is devoted to solving the technical problem of development of calculation methods and choice of rational schemes of dual path hydraulic volume mechanical transmission (HVMT) wheeled tractors, which allows you to select the optimal scheme HVMT at the design stage. Actuality of work consists in the necessity of providing of competitiveness of Ukraine tractors. The analysis of work of the dual path HVMT tractors of foreign analogues is carried out. Refined mathematical model of hydrostatic axial-piston hydraulic machines as the main HVMT elements identity-based loss coefficients with the latest experimental data loss and coefficient of performance (COP). The algorithm and the computational procedure for the establishment of a oneto-one correspondence between the operating parameters and the efficiency of hydraulic drive system (HDS) losses in forward and reverse flow of power through the HDS for her work in the dual path tractor HVMT. Calculation-theoretical methodology and her programmatic realization is first worked out for determination of HDS parameters, dual path HVMT and basic technical and economic indexes of tractor-aggregate taking into account the modes of circulation of power, losses in HDS, HVMT and skidding of tractor for an analysis and prognostication of descriptions alternative tractor HVMT and scientific ground of the most rational transmission for a certain tractor. The problem of construction of universal descriptions of tractor is first set and decided with dual path HVMT. Original solution of task offers on visualization of kinematics, power and power parameters of dual path HVMT of the perspective Ukrainian tractors in all range of their operating modes as an important criterion for comparison of alternative schematics of HVMT. Universal descriptions of first in Ukraine and on post-soviet space of tractor of XTZ-21021 from stepless HVMT-1S development of NТU "KhPI" and propulsion MODULE of "XTZ" are built. Results numeral and natural experiments allow to draw conclusion, that the calculation-theoretical methodologies and constituents of them worked out in dissertation mathematical models are adequate and directed to on an increase efficiency and competitiveness of the Ukrainian tractors.

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Бурлига, Михайло Борисович. "Розвиток методів розрахунку та вибір раціональних схем двопотокових безступінчастих гідрооб'ємно-механічних трансмісій колісних тракторів". Thesis, НТУ "ХПІ", 2018. http://repository.kpi.kharkov.ua/handle/KhPI-Press/35536.

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Thornton, Sarah Marie. "Adaptive control of hydraulic shift actuation in an automatic transmission." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/81716.

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Анотація:

Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2013.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 79-80).
A low-order dynamic model of a clutch for hydraulic control in an automatic transmission is developed by separating dynamics of the shift into four regions based on clutch piston position. The first three regions of the shift are captured by a physics-based model and the fourth region is represented by a system identification model. These models are determined using nominal values and validated against nominal and off-nominal experimental data. The model provides two lumped flow parameters to be used for tuning to the desired hydraulic clutch system. Using feedback information from the model and transmission mechanicals, a closed -loop adaptive controller is designed. The controller is structured to update at three different rates: every time instance, every shift, and every n-th number of shifts. Part of the controller is designed to operate in open-loop for the first two regions of the shift until feedback information is available. The open-loop controller adapts within the shift, thus allowing for corrections to the control design to be made in following shifts. The model tuning parameters as well as the main spring preload become the adaptive parameters, which are then adjusted so that the plant matches the model. The control design is validated against a high fidelity simulation model of the transmission hydraulics and mechanicals.
by Sarah Marie Thornton.
S.M.

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Karlborg, Jonathan, and Emil Sten. "Braking with a Directional Control Valve in a Hydraulic Open-Loop Transmission." Thesis, Linköpings universitet, Fluida och mekatroniska system, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-178207.

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Анотація:

This project presents an investigation if natural braking characteristics could be achieved on an open-loop hydraulic transmission without a brake valve. The goal with the simplified system was to utilize the directional control valve to achieve similar functionality as the brake valve does in the conventional system. If the solution functions properly, it will reduce costs, save time and simplify the conventional system which uses a dedicated brake valve. With a simulation model and practical experiments, the simplified system was thoroughly studied and tested. Two different concepts of how to control the directional control valve were developed, named Fixed Control and Torque Control. The Fixed Control concept has a predetermined de-stroking profile which is not affected by other system signals other than the gas pedal signal. The Torque Control concept uses in addition to the gas pedal signal, pressure sensors over the motors to maintain a constant braking torque. Both developed concepts were able to produce natural braking characteristics. However, the Torque Control concept performed better at different circumstances. Respective concept can be tuned further for improvements, but in the scope of this project the goal was accomplished. Utilizing the directional control valve to achieve a hydraulic brake function, has potential to be a solutionfor heavy mobile machinery in near future. However, further research and testing are required to be conducted on other heavy mobile machinery which have greater top speeds and load capabilities than the machinery used in this project.

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Min, Ki-Bok. "Determination of equivalent hydraulic and mechanical properties of fractured rock masses using the distinct element method." Licentiate thesis, KTH, Land and Water Resources Engineering, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-1550.

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The equivalent continuum approach uses equivalent propertiesof rock mass as the input data for a continuum analysis. Thisis a common modeling method used in the field of rock mechanicsand hydrogeology. However, there are still unresolvedquestions; how can the equivalent properties be determined andis the equivalent continuum approach suitable for modeling thediscontinuous fractured rock mass.

The purpose of this paper is to establish a methodology todetermine the equivalent hydraulic and mechanical properties offractured rock masses by explicit representations of stochasticfracture systems, to investigate the scale-dependency of theproperties, and to investigate the conditions for theapplication of the equivalent continuum approach for thefractured rock masses. Geological data used for this study arefrom the site characterization of Sellafield, Cumbria, UK. Aprogram for the generation of stochastic Discrete FractureNetwork (DFN) is developed for the realization of fractureinformation and ten parent DFN models are constructed based onthe location, trace length, orientation and density offractures. Square models with the sizes varying from 0.25 m× 0.25 m to 10 m × 10 m are cut from the center ofthe each parent network to be used for the scale dependencyinvestigation. A series of the models in a parent network arerotated in 30 degrees interval to be used for investigation oftensor characteristic. The twodimensional distinct elementprogram, UDEC, was used to calculate the equivalentpermeability and compliance tensors based on generalizedDarcys law and general theory of anisotropic elasticity.Two criteria for the applicability of equivalent continuumapproach were established from the investigation: i) theexistence of properly defined REV (Representative ElementaryVolume) and ii) existence of the tensor in describing theconstitutive equation of fractured rock The equivalentcontinuum assumption cannot be accepted if any one of the abovetwo criteria is not met. Coefficient of variation and meanprediction error is suggested for the measures toquantitatively evaluate the errors involved in scale dependencyand tensor characteristic evaluation.

Equivalent permeability and mechanical properties (includingelastic modulus and Poissons ratios) determined onrealistic fracture network show that the presence of fracturehas a significant effect on the equivalent properties. Theresults of permeability, elastic moduli and Poisson's ratioshow that they narrow down with the increase of scale andmaintain constant range after a certain scales with someacceptable variation. Furthermore, Investigations of thepermeability tensor and compliance tensor in the rotated modelshow that their tensor characteristics are satisfied at acertain scale; this would indicate that the uses of theequivalent continuum approach is justified for the siteconsidered in this study.

The unique feature of the thesis is that it gives asystematic treatment of the homogenization and upscaling issuesfor the hydraulic and mechanical properties of fractured rockswith a unified approach. These developments established a firmfoundation for future application to large-scale performanceassessment of underground nuclear waste repository byequivalent continuum analysis.

Keywords :Equivalent continuum approach, Equivalentproperty, Representative Elementary Volume (REV), DistinctElement Method, Discrete Fracture Network (DFN)

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Abdelgayed, Mohamed E. "Design and Control the Ancillary System for Hydraulic Hybrid Vehicle (HHV)." University of Toledo / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1278075678.

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Saleh, Naseer Ahmed. "Investigation of reciprocating internal combustion engine structure response and vibration transmission using a hydraulic simulation technique." Thesis, University of Southampton, 1987. https://eprints.soton.ac.uk/52287/.

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The success of theoretical engine noise prediction, using such techniques as finite element modelling, is highly dependent upon the understanding of the various mechanisms of noise generation in the running engine. The forcing mechanism of an operating engine is complicated as it involves a large number of forces taking place simultaneously or in rapid succession at various positions in the structure. A number of test methods have been developed to simulate individually each one of these loading mechanisms on non-running engines. These test methods are reviewed in this thesis with an objective judgement on their representation of the actual forcing on the running engine. A new hydraulic test method has been successfully developed to simulate various forms of loading mechanisms on the non-running engine like the gas force on top of the piston, main bearings axial and vertical loading, and piston slap force. This test method is shown to be more comprehensive, realistic, practical and representative than previous simulation techniques, especially with respect to the level of forcing which corresponds well with that of the running engine. The structural sensitivity of the engine has been evaluated for different representative loading, the most sensitive input being that of the axial force at the main bearings. The damping characteristics of a large six cylinder diesel engine block has been calculated and the crank shaft is shown to affect it as well as affecting the wave propagation through the structure. The simulation technique has also allowed the detailed study of the various forms of wave propagation in a diesel engine load carrying structrue and this has shown the importance of both bending and longitudinal travelling waves in noise radiation. It is shown that bending waves provide the maximum amplitudes of vibration, whereas longitudinal wave propagation allows for the fast transfer of energy through the structure which can then convert into bending waves with high noise radiation potential. Analysis of the results has shown that some doubt must be placed on the normal mode method for predicting the response in the lower frequency range, and an alternative model based on highly damped travelling bending waves is visualized to be suitable to model the crank case wall but not the stiff upper.

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Skoupil, Jakub. "Vliv etherů celulózy na vlastnosti hydraulického vápna." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2019. http://www.nusl.cz/ntk/nusl-392357.

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This diploma thesis deals with the study of the influence of cellulose ethers on the properties of hydraulic lime mortars. The availability and price of cellulose ethers in the industrial market is very favorable, but we can´t meet with studies using cellulose ethers in building materials, where lime is used as a binder. Cellulose ethers are commonly used as thickening agents in cement-based materials. The purpose of this diploma thesis is to review if cellulose ethers are appropriate for use in hydraulic lime mortars, either as water retention agents that contribute by water retention to better hydration of hydraulic binder components or to affect the properties of mortar in the fresh state. The theoretical part is dedicated to cellulose ethers, especially their production and how they influence the properties of building materials. In the practical part, the thesis deals with the influence of the dose of five different types of cellulose ethers on the properties of hydraulic lime. The properties in the fresh state and the physical-mechanical properties of mortars were monitored over time.

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Larsson, Viktor, and L. Viktor Larsson. "Simulation and Testing of Energy Efficient Hydromechanical Drivlines for Construction Equipment." Thesis, Linköpings universitet, Fluida och mekatroniska system, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-107495.

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Increased oil prices and environmental issues have increased a need of loweringthe emissions from and the fuel consumption in heavy construction machines. Anatural solution to these issues is a lowered input power through downsizing ofthe engine. This implies a demand on higher transmission efficiency, in order tominimize the intrusion on vehicle performance. More specifically, alternatives tothe conventional torque converter found in heavier applications today, must beinvestigated. One important part of this is the task of controlling the transmissionwithout jeopardising the advantages associated with the torque converter, such asrobustness and controllability.In this thesis, an alternative transmission concept for a backhoe loader is investigated.The studied concept is referred to as a 2-mode Jarchow power-splittransmission, where a mechanical path is added to a hydrostatic transmission inorder to increase transmission efficiency. The concept is evaluated in computerbased simulations as well as in hardware-in-the-loop simulations, where a physicalhydrostatic transmission is exposed for the loads caused by the vehicle duringvarying conditions. The loads are in turn simulated according to developed modelsof the mechanical parts of the vehicle drive line.In total, the investigated concept can be used instead of the torque converterconcept, if the hydrostatic transmission is properly controlled. The results alsoshow that there is a high possibility that the combustion engine in the backhoeloader can be downsized from 64 kW to 55 kW, which would further increase thefuel savings and reduce the emissions.

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Книги з теми "Hydraulic volume mechanical transmission"

Scott, Thomas E. Power Transmission: Mechanical, Hydraulic, Pneumatic and Electrical. Prentice Hall, 1999.

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Scott, Thomas E. Power Transmission: Mechanical, Hydraulic, Pneumatic and Electrical. Prentice Hall, 1999.

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Advances in Heat Transfer, Volume 39 (Advances in Heat Transfer). Academic Press, 2006.

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(Editor), George A. Greene, Young I. Cho (Editor), James P. Hartnett † (Editor), and Avram Bar-Cohen (Editor), eds. Advances in Heat Transfer, Volume 39 (Advances in Heat Transfer). Academic Press, 2006.

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James P. Hartnett † (Series Editor), Thomas F. Irvine (Series Editor), George A. Greene (Series Editor), and Young I. Cho (Series Editor), eds. Advances in Heat Transfer, Volume 31. Academic Press, 1998.

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(Editor), Thomas F. Irvine, James P. Hartnett † (Series Editor), Young I. Cho (Series Editor), and George A. Greene (Series Editor), eds. Advances in Heat Transfer, Volume 34 (Advances in Heat Transfer). Academic Press, 2000.

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Handbook Of Research For Mechanical Engineering Volume 1 Fluid Mechanics And Heat Transfer. Apple Academic Press Inc., 2014.

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James P. Hartnett † (Series Editor), Thomas F. Irvine (Series Editor), George A. Greene (Series Editor), and Young I. Cho (Series Editor), eds. Transport Phenomena in Crystal Growth, Volume 30 (Advances in Heat Transfer). Academic Press, 1997.

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Частини книг з теми "Hydraulic volume mechanical transmission"

Röper, R. "Hydraulic and Pneumatic Power Transmission." In Dubbel Handbook of Mechanical Engineering, G1—G20. London: Springer London, 1994. http://dx.doi.org/10.1007/978-1-4471-3566-1_7.

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Grapes, Michael D., Yong Zhang, Melissa K. Santala, Thomas Voisin, Geoffrey H. Campbell, and Timothy P. Weihs. "In Situ High-Rate Mechanical Testing in the Dynamic Transmission Electron Microscope." In MEMS and Nanotechnology, Volume 5, 25–30. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-22458-9_4.

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Lafleur, F., S. Bélanger, L. Marcouiller, and A. Merkouf. "Acoustic and Mechanical Measurements of an Hydraulic Turbine’s Generator in Relation to Power Levels and Excitation Forces." In Structural Dynamics, Volume 3, 225–31. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-9834-7_20.

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Lafleur, F., S. Bélanger, E. Coutu, and A. Merkouf. "Spectral Analysis Methodology for Acoustical and Mechanical Measurements Relative to Hydraulic Turbine’s Generator." In Rotating Machinery, Structural Health Monitoring, Shock and Vibration, Volume 5, 15–24. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-9428-8_2.

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Zhang, Feng, and Yonglin Xiong. "2D and 3D Thermo-Hydraulic-Mechanical Analysis of Deep Geologic Disposal in Soft Sedimentary Rock." In Engineering Geology for Society and Territory - Volume 6, 493–97. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-09060-3_86.

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Wang, Yongliang. "Adaptive Finite Element-Discrete Element-Finite Volume Algorithm for Three-Dimensional Multiscale Propagation of Hydraulic Fracture Network Considering Hydro-Mechanical Coupling." In Adaptive Analysis of Damage and Fracture in Rock with Multiphysical Fields Coupling, 171–92. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-7197-8_8.

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"Mechanical strength of hydraulic cement with addition of 2 & 4% of sugar cane bagasse." In Concrete Under Severe Conditions, Two Volume Set, 1518–25. CRC Press, 2010. http://dx.doi.org/10.1201/b11817-212.

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Romero, R., M. Baltazar, D. Nieves, E. Maldonado, G. Fox, H. Hernández, U. Bañuelos, and R. Hernández. "Mechanical strength of hydraulic cement with addition of 2 & 4% of sugar cane bagasse." In Concrete Under Severe Conditions, Two Volume Set, 1559–66. CRC Press, 2010. http://dx.doi.org/10.1201/b10552-213.

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Han, Chang Dae. "Rheology of Block Copolymers." In Rheology and Processing of Polymeric Materials: Volume 1: Polymer Rheology. Oxford University Press, 2007. http://dx.doi.org/10.1093/oso/9780195187823.003.0014.

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Block copolymer consists of two or more long blocks with dissimilar chemical structures which are chemically connected. There are different architectures of block copolymers, namely, AB-type diblock, ABA-type triblock, ABC-type triblock, and AmBn radial or star-shaped block copolymers, as shown schematically in Figure 8.1. The majority of block copolymers has long been synthesized by sequential anionic polymerization, which gives rise to narrow molecular weight distribution, although other synthesis methods (e.g., cationic polymerization, atom transfer radical polymerization) have also been developed in the more recent past. Owing to immiscibility between the constituent blocks, block copolymers above a certain threshold molecular weight form microdomains (10–50 nm in size), the structure of which depends primarily on block composition (or block length ratio). The presence of microdomains confers unique mechanical properties to block copolymers. There are many papers that have dealt with the synthesis and physical/mechanical properties of block copolymers, too many to cite them all here. There are monographs describing the synthesis and physical properties of block copolymers (Aggarwal 1970; Burke and Weiss 1973; Hamley 1998; Holden et al. 1996; Hsieh and Quirk 1996; Noshay and McGrath 1977). Figure 8.2 shows schematically four types of equilibrium microdomain structures observed in block copolymers. Referring to Figure 8.2, it is well established (Helfand and Wasserman 1982; Leibler 1980) that in microphase-separated block copolymers, spherical microdomains are observed when the volume fraction f of one of the blocks is less than approximately 0.15, hexagonally packed cylindrical microdomains are observed when the value of f is between approximately 0.15 and 0.44, and lamellar microdomains are observed when the value of f is between approximately 0.44 and 0.50. Some investigators have observed ordered bicontinuous double-diamonds (OBDD) (Thomas et al. 1986; Hasegawa et al. 1987) or bicontinuous gyroids (Hajduk et al. 1994) at a very narrow range of f (say, between approximately 0.35 and 0.40) for certain block copolymers. Figure 8.2 shows only one half of the symmetricity about f = 0.5. Transmission electron microscopy (TEM), small-angle X-ray scattering (SAXS), and small-angle neutron scattering (SANS) have long been used to investigate the types of microdomain structures in block copolymers.

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Engelder, Terry, Jan Vermilye, Alfred Lacazette, Peter Geiser, Charles Sicking, and John N. Hooker. "Seismic emissions reveal the mechanical stratigraphy of the Middle Paleozoic section under the Appalachian Plateau, Pennsylvania." In From the Guajira Desert to the Apennines, and from Mediterranean Microplates to the Mexican Killer Asteroid: Honoring the Career of Walter Alvarez. Geological Society of America, 2022. http://dx.doi.org/10.1130/2022.2557(14).

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ABSTRACT The Middle Paleozoic section of the Appalachian Plateau exhibits a mechanical stratigraphy defined by layers that emit seismic energy with unique signatures in response to a strain energy accumulated on time scales associated with local, regional, and plate-scale processes. The Earth is in a state of frictional equilibrium, which means that even small changes in effective stress cause brittle failure and the concomitant release of ambient seismic energy. Stress changes as low as 0.001 MPa, the level of stress changes during Earth tides or the transmission of a fluid pressure wave, can activate failure on critically oriented fractures. These phenomena lead to a release of ambient seismic energy, which can be mapped using seismic emission tomography (SET) methods to image fracture networks emitting coherent seismic waves. We used a buried array of 54 sondes to identify active fracture networks over a contiguous volume of 3.76 km3 within Middle Paleozoic rocks hosting two Marcellus gas shale wells drilled under the Appalachian Plateau of Lycoming County, Pennsylvania, USA. We sampled ambient seismic emissions before and after two stimulations and found that the pattern was repeatable. The fracture patterns illuminated by ambient seismic emissions defined a mechanical stratigraphy populated by clouds of seismic activity separated by packages of beds emitting relatively less seismic energy. The unique attribute of the beds emitting less seismic energy is a lower least horizontal stress (Shmin) relative to adjacent mechanical units in the section. These low stress beds include the bottom portion of both the Marcellus and Burket/Geneseo black shales. There are three thicker mechanical units carrying clouds of higher energy emissions. These three units include siltstones of the Brallier above the Burket/Geneseo package, silty shale beds of the Mahantango between the Marcellus and Burket/Geneseo packages, and Silurian-Devonian carbonates below the Marcellus package. In map view, emission patterns in the Brallier follow Alleghanian J2 joints. Patterns in the Mahantango are consistent with slip along columnar joint zones like those cutting upward in outcrops of shale on the Appalachian Plateau. In sum, SET reveals a mechanical stratigraphy based on the release of strain energy from three major units of the Middle Paleozoic section.

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Тези доповідей конференцій з теми "Hydraulic volume mechanical transmission"

Zhou, Lufei, Kangmin Zhong, and Xiaoming Sheng. "Reconfigurable Clamping Device Based on Multi-Function Link and Hydraulic Cylinder With Built-In Piston Rod." In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-11032.

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Reconfigurable clamping devices based on multi-function linkage and rod-less piston cylinder by fluid transmission were introduced. Their working principles have been introduced, and the relevant mechanics calculation formulas were presented. In these devices, rod-less piston cylinder was used as a drive, while multi-function bars and wheels with simple and similar geometric shapes as the basic components. The needs for the clamping of workpieces with different sizes or shapes and requirements for the line-contact or face-contact clamping can be meet by changing the shapes of the basic components and the locations, meanwhile great clamping force can be provided. Due to the rapid reconstruction, the demands of multi-type, variable-volume and short periods can be satisfied.

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Liu, Yang, Kangmin Zhong, Xiaoming Sheng, and Mingdi Wang. "The Green, Digital Clamping Device Composed of Self-Locking Power Screw Driven by the Servo Motor." In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-11027.

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Fluid transmission, such as hydraulic and pneumatic, is widely used in the fixtures in modern industry. But there are some disadvantages in these fixtures. First, too much loops and turns in the hydraulic or pneumatic systems have lead to lower energy utilization ratio and complicated structure. Second, oil emission in hydraulic system may cause environment pollution, and the noise in pneumatic system may cause pollution too. Third, fluid system always needs electro-hydraulic or electro-pneumatic transform elements for digital intelligent control, which will add the cost and the complexity of system. In order to overcome this disadvantage, a new kind of mechatronics clamping device is designed innovatively, which is driven by servo motor and translated along the self-locking power screw. So it was very simple with little transmission elements and has no high-speed mechanic components. By changing the geometry shape of basic link, different requirements for clamping forces and clamping situations can be satisfied. This new kind of clamping device has prominent advantages in green and digital aspects. Moreover, it can meet perfectly the requirements of short-cycle, high-volume production in modern manufacturing industry.

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Elwood, David, Solomon Yim, Alex Yokochi, Ken Rhinefrank, Joe Prudell, Al Schacher, Peter Hogan, Aaron Vander Muelen, Annette von Jouanne, and Ted Brekken. "Numerical and Experimental Modeling of Direct-Drive Wave Energy Extraction Devices." In ASME 2007 26th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2007. http://dx.doi.org/10.1115/omae2007-29728.

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The solutions to today’s energy challenges need to be explored through alternative, renewable and clean energy sources to enable a diverse national energy resource plan. An extremely abundant and promising source of energy exists in the world’s oceans in the forms of wave, tidal, marine current, thermal (temperature gradient) and salinity. Among these forms, significant opportunities and benefits have been identified in the area of wave energy extraction. Waves have several advantages over other forms of renewable energy such as wind and solar, in that the waves are more available (seasonal, but more constant) and more predictable, thus enabling more straightforward and reliable integration into the electric utility grid. Wave energy also offers higher energy densities, enabling devices to extract more power from a smaller volume at consequent lower costs. However, many engineering challenges need to be overcome to ensure wave energy device survivability, reliability and maintainability, in addition to efficient and high quality power take-off systems. Optimizing wave energy technologies requires a multi-disciplinary team from areas such as Electrical, Chemical, Ocean, Civil and Mechanical Engineering, to enable innovative systems-level research and development. This paper presents some recent research developments on experimental and numerical modeling on direct-drive approaches and the associated devices designed to convert the motion of the ocean waves into electrical energy using point absorber wave energy converters. This research is focused on a simplification of processes, i.e., replacing systems using intermediate hydraulics or pneumatics with direct-drive approaches to allow generators to respond directly to the movement of the ocean by employing magnetic fields for contact-less mechanical energy transmission, and power electronics for efficient electrical energy extraction. The term “direct” drive describes the direct coupling of the buoy’s velocity and force to the generator without the use of hydraulic fluid or air. The wave energy buoy and spar are designed to efficiently capture ocean wave energy and transfer it to the generator. These buoys have been tested at the Oregon State University O.H. Hinsdale Wave Research Laboratory, with planned testing off the coast of Oregon. The paper will examine several direct-drive approaches, including electrical and mechanical design characteristics, describe the numerical modeling of the associated conceptual devices, prototype testing, and some ongoing research on the dynamics of buoy generator systems for design optimization.

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Macedo, Tiago, Victor Juliano De Negri, and Leonardo Serfert Junior. "Modelling the Hydraulic Circuit of an Automatic Transmission." In 24th ABCM International Congress of Mechanical Engineering. ABCM, 2017. http://dx.doi.org/10.26678/abcm.cobem2017.cob17-0761.

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Lin Cheng, Junhui Shi, and Wenwei Wang. "Gear shift control system for a hydraulic mechanical transmission." In 2014 IEEE Transportation Electrification Conference and Expo, Asia-Pacific (ITEC Asia-Pacific). IEEE, 2014. http://dx.doi.org/10.1109/itec-ap.2014.6941018.

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da Silva Lima, Gabriel, and Gabriel Ivan Medina Tapia. "THERMO-HYDRAULIC CALCULATION IN CSP SYSTEMS USING THE FINITE VOLUME METHOD." In 24th ABCM International Congress of Mechanical Engineering. ABCM, 2017. http://dx.doi.org/10.26678/abcm.cobem2017.cob17-1138.

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Tenereli, Keveen, Hermínio Tasinafo Honório, and Clovis Maliska. "Flow and Leakoff in a Hydraulic Fracture Using the Finite Volume Method." In 26th International Congress of Mechanical Engineering. ABCM, 2021. http://dx.doi.org/10.26678/abcm.cobem2021.cob2021-0207.

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Li, Mingsheng, Manfeng Gong, Yuechao Sun, and Man Li. "Discussion on Teaching Method of the Hydraulic Mechanical Automatic Transmission." In 2017 3rd International Conference on Social Science and Higher Education. Paris, France: Atlantis Press, 2017. http://dx.doi.org/10.2991/icsshe-17.2017.73.

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Ellman, A., H. Kauranne, J. Kajaste, and M. Pietola. "Effect of Parameter Uncertainty on Reliability of Hydraulic Transmission System Simulation." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-82350.

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Simulation of fluid power systems has become a tool widely used for designing and testing purposes. The usefulness of this approach is however highly dependent on the results that have uncertainty to some extent. In the theoretical approach uncertainty depends mainly on the simplifications made in the modeling, algorithms used and parameters. In the experimental approach uncertainty depends on the transducers and the construction of the measurement system and data transfer. This paper discusses the effect of parameter uncertainty on the reliability of virtual testing of hydrostatic transmission systems in general. The definition of the total uncertainty by using a sum of variances is presented and applied to basic equations of fluid power. As an application a simplified hydrostatic transmission circuit is investigated. Importance of grade of models in reducing the computational inaccuracy is discussed.

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Zhida, Yang, Wang Liyong, and Chen Tao. "Shifting control system design for hydraulic mechanical transmission of wet clutch." In 2017 13th IEEE International Conference on Electronic Measurement & Instruments (ICEMI). IEEE, 2017. http://dx.doi.org/10.1109/icemi.2017.8265723.

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