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Littérature scientifique sur le sujet « Hydrostatic circuit »

Auteur : Grafiati

Publié le 4 juin 2021

Mis à jour le 3 février 2022

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Articles de revues sur le sujet "Hydrostatic circuit"

Dong, Bi Zheng, et Deng Hua Li. « Design and Implementation of Digital Piezoelectric Constant Testing System ». Applied Mechanics and Materials 668-669 (octobre 2014) : 911–15. http://dx.doi.org/10.4028/www.scientific.net/amm.668-669.911.

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Digital piezoelectric constant testing system was designed in this paper, which was based on hydrostatic test method. The system is composed of hydrostatic device, charge amplifier circuit, peak holding circuit, A/D calibration circuit, data processing by DSP. Pressure-release value is obtained by digital pressure transmitter on the hydrostatic device. Combining with mean filtering and A/D calibration, DSP can sample accurate voltage signal. Considering the difference between the equivalent circuit of charge amplifier and its practical circuit, the calculated hydrostatic piezoelectric constant is in better agreement with the theoretical value. The experiment results show that the accuracy of testing system is less than 4%.

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Koury Costa, Gustavo, et Nariman Sepehri. « A Critical Analysis of Flow-Compensated Hydrostatic Single Rod Actuators : Simulation Study ». Actuators 9, n^o 3 (22 juillet 2020) : 58. http://dx.doi.org/10.3390/act9030058.

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It is well established that the differential cylinder area in pump-controlled single-rod actuators creates the need of correctly switching the connections between the main circuit lines and a charge circuit, in order to provide means for equalising the flows into and out of the pump and the actuator. Many attempts to automatically switch the charge circuit connections to either cap- and rod-sides of the hydraulic cylinder have been made through the years. However, in many of these attempts, strong oscillations in the cylinder motion were observed when operational quadrants were changed under some particular velocity and force conditions. In this paper, we perform a thorough numerical analysis for some representative pump-controlled single-rod actuators. The goal is to understand the causes of undesirable behaviour of several circuits under certain operating situations. We show through comprehensive simulations that all but one circuit design produces undesirable oscillatory results under these circumstances. This paper is built upon and complements a previously published paper by the same authors on this important subject.

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Petranský, I., et M. Bolla. « Testing stand for life tests of hydrostatic pumps with a polluted fluid ». Research in Agricultural Engineering 49, No. 4 (8 février 2012) : 151–56. http://dx.doi.org/10.17221/4966-rae.

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Testing of the lifetime of hydrostatic transmissions can be done on special testing stands. Some testing stands use a pressure valve connected at the outlet of a pump. When using this design of stands, it is important to keep clear the operating fluid by filters and it is not possible to observe the influence of fluid pollution on the lifetime. The article presents a design of an electro-hydraulic testing stand with computer control system for accelerated lifetime tests of hydrostatic pumps under laboratory conditions when using a polluted operating fluid. A pump, which is mechanically connected with a hydrostatic motor, through a clutch, is an interface between the hydrostatic circuit of the tested pump and the hydrostatic circuit of the loading simulator. At lifetime testing, this interface makes it possible to use the polluted fluid in the hydraulic circuit of the tested pump, and thereby observe its influence. Instead of a polluted fluid, it is possible to use biodegradable oil and observe its influence on the lifetime of a pump. When using the same hydraulic fluid in both systems of the stand, it is possible to test two pumps at the same time.

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Koury Costa, Gustavo, et Nariman Sepehri. « A Critical Analysis of Valve-Compensated Hydrostatic Actuators : Qualitative Investigation ». Actuators 8, n^o 3 (30 juillet 2019) : 59. http://dx.doi.org/10.3390/act8030059.

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Hydrostatic actuation has gained interest from both academia and industry due to the unquestionable energetic advantages when compared to valve-controlled actuators; the main feature being the absence of throttling losses due to the direct control of the cylinder by the pump. However, the fact that the great majority of applications are based on single-rod cylinders has been both a challenge and a source of inspiration for a variety of different circuit designs. In an attempt to compensate for the uneven flows coming in and out of differential cylinders, several solutions have been proposed, including the use of hydraulic transformers, individual pumps connected to the cylinder ports or pumps with unmatched input and output flows. The simplest approach, however, seems to be the use of compensation valves in the circuit, which is the focus of this paper. Here, we analyse some representative circuits proposed along the years in a direct and elucidative manner, showing that the definitive solution to the single-rod actuator control problem has been established, paving the road for introducing stable and trustworthy circuits, which can be commercially used in the near future.

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Mandal, S. K., K. Dasgupta, S. Pan et A. Chattopadhyay. « Theoretical and experimental studies on the steady-state performance of low-speed high-torque hydrostatic drives. Part 2 : Experimental investigation ». Proceedings of the Institution of Mechanical Engineers, Part C : Journal of Mechanical Engineering Science 223, n^o 11 (6 juillet 2009) : 2675–85. http://dx.doi.org/10.1243/09544062jmes1203.

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The performance investigations of an open-circuit and a closed-circuit low-speed high-torque hydrostatic drive are presented. The modelling of both drives and determination of their loss coefficients are presented in Part 1 of this article (pg. 2663 of this issue). This study determines and analyses the overall efficiency and slip characteristics of the hydrostatic drives using the expressions describing the characteristics of their loss coefficients. The effects of critical control parameters of the pumps and the motor are investigated on the basis of their steady-state performance. This investigation is based on the performance of the hydrostatic transmission drives at different torque levels.

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TROPP, Michal, et Ronald BASTOVANSKY. « APPLICATION OF HYDRAULIC CIRCUIT IN MECHATRONIC SYSTEMS ». Journal of Technology and Exploitation in Mechanical Engineering 2, n^o 1 (26 décembre 2016) : 5–10. http://dx.doi.org/10.35784/jteme.404.

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This paper focuses on the calculations of basic variables of the hydrostatic circuits in the mechatronic systems. These calculations are important for machines used for forming materials by means of great forces, e.g. hydraulic press. Due to differences in equipment design, lack of a universal method of calculation is noticeable. It is necessary to determine the coefficients required for the calculations in an experimental way.

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Cai, Bao Ping, Yong Hong Liu, Yan Ting Zhang, Jiang Tao Ma, Yun Wei Zhang, Yu Juan Zhuang, Pei Wei Lu et Yu Gui Luo. « Development of Test System for Subsea Tree Equipment ». Applied Mechanics and Materials 440 (octobre 2013) : 222–27. http://dx.doi.org/10.4028/www.scientific.net/amm.440.222.

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A test system for subsea tree equipment is developed for tree function testing after repair. The test system mainly consists of hydraulic unit and electric unit. The hydraulic unit is developed by revamping an old hydraulic power unit, which consist of six components, including reservoir, flush/fill pump circuit, high pressure hydraulic pump circuits, accumulator group, hydraulic supply circuits and fluid return circuit. The electric unit for subsea tree is developed by using NI Compact DAQ system, In order to control the hydraulic unit and acquire the pressure signals easily. The test procedures for flowloops, valve, and hydrostatic hydraulic pressure cycling are proposed based on the factory acceptance testing of subsea tree. A test for a repaired subsea tree is performed by using the developed test system. The results show that the repaired subsea tree is good enough after repair, and verify that the developed test system works well.

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Wang, Edward C. Y., Jey-Myung Lee, John P. Johnson, Thomas R. Kleyman, Robert Bridges et Gerard Apodaca. « Hydrostatic pressure-regulated ion transport in bladder uroepithelium ». American Journal of Physiology-Renal Physiology 285, n^o 4 (octobre 2003) : F651—F663. http://dx.doi.org/10.1152/ajprenal.00403.2002.

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The effect of hydrostatic pressure on ion transport in the bladder uroepithelium was investigated. Isolated rabbit uroepithelium was mounted in modified Ussing chambers and mechanically stimulated by applying hydrostatic pressure across the mucosa. Increased hydrostatic pressure led to increased mucosal-to-serosal Na+ absorption across the uroepithelium via the amiloride-sensitive epithelial Na+ channel. In addition to this previously characterized pathway for Na+ absorption, hydrostatic pressure also induced the secretion of Cl– and K+ into the mucosal bathing solution under short-circuit conditions, which was confirmed by a net serosal-to-mucosal flux of 36Cl– and 86Rb+. K+ secretion was likely via a stretch-activated nonselective cation channel sensitive to 100 μM amiloride, 10 mM tetraethylammonium, 3 mM Ba2+, and 1 mM Gd3+. Hydrostatic pressure-induced ion transport in the uroepithelium may play important roles in electrolyte homeostasis, volume regulation, and mechanosensory transduction.

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Liu, Huanlong, Dafa Li, Guanpeng Chen, Chixin Xie, Jiawei Wang et Lei Feng. « Research on power coupling characteristics and acceleration strategy of electro-hydrostatic hydraulic hybrid power system ». Proceedings of the Institution of Mechanical Engineers, Part I : Journal of Systems and Control Engineering 235, n^o 8 (25 janvier 2021) : 1445–59. http://dx.doi.org/10.1177/0959651820987729.

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Aiming at the adverse effect of the peak power of the electric motor of the battery-powered rail vehicles on the battery life and the driving range when starting or accelerating, a new type of electro-hydrostatic hydraulic hybrid powertrain is designed. This article proposes a novel power form that assists the vehicle to start or accelerate through two power coupling methods: torque coupling circuit and flow rate coupling circuit which have good power performance and energy-saving performance. A mathematical model for power coupling of hybrid power system is constructed, and the effects of key parameters of the system and different power coupling ratios on electric power consumption and power coupling characteristics are studied. Based on the simulation and test platform, the power coupling characteristics of the electro-hydrostatic hydraulic hybrid powertrain are simulated and experimentally researched. The results show that compared with the traditional electro-hydrostatic series system, the novel electro-hydrostatic hydraulic hybrid powertrain can effectively avoid the impact of electric motor power and reduce the power consumption. Based on the characteristics of power coupling, the acceleration strategy of minimum peak power is studied to control the key components of the power coupling process. Simulation and experimental results show that under the control of the new acceleration strategy, the electro-hydrostatic hydraulic hybrid powertrain has good electro-hydraulic power coupling characteristics. The electric power of the power system is greatly reduced during acceleration, which has better energy-saving characteristics and value for engineering applications.

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Drabant, Š., M. Bolla, A. Žikla, I. Petranský et J. Ďuďák. « Testing device with opened hydrostatic circuit for dynamic loading of the tractor engine by power take off shaft ». Research in Agricultural Engineering 51, No. 3 (7 février 2012) : 91–98. http://dx.doi.org/10.17221/4909-rae.

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The developed loading device with opened hydrostatic circuit for measurement of speed and dynamic characteristics of the tractor engine by power take off is presented. This loading device may also be used as a portable type for field measurement. At present for development of these loading devices controlled hydrogenerators and electro-hydraulic proportional pressure valves directed by computer may by used to adjust geometrical volume of the hydrogenerator from zero to maximum value. There is a possibility to built these devices which consist of one hydrogenerator and one by-pass valve for the maximum power of internal combustion engine 420 kW which is sufficient from the point of view of practical need. Thus optional loading regime may be used according to the tractor engine horsepower to achieve the required accuracy of measurement.

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Thèses sur le sujet "Hydrostatic circuit"

Dano, Matej. « Hydrostatický pohon pojezdového ústrojí harvestoru ». Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-232039.

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The object of this master’s thesis is design of a suitable hydrostatic travel drive for harvester. The first part dedicates of constructions of harvesters and actual different conceptions of travel drive. Next, there are design of hydrostatic circuit, calculation of general hydraulic parameters and design of hydraulic components in the second part. The last part deals with issue of combustion engine and cooler.

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Gerec, Matúš. « Pohonný a brzdový systém motorového vozu železnice pro muzeum průmyslových železnic ». Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-318852.

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This thesis deals with the design of the propulsion and braking system for narrow gauge railcar. It contains the design of hydrostatic drive system with closed-loop hydraulic circuit. Then thesis describes the concept of propulsion system placement in the frame of the railcar and design of the braking system.

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Bilko, Tomáš. « Návrh okruhu hydrostatického řízení traktoru Forterra ». Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-231014.

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The topic of this thesis is strength check of hydrostatic steering circuit for Zetor Forterra HSX tractor. Next part of the thesis deals with steering column support structure and pedal group console design including FEM analysis, allowing installation of steering columns of different types.

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Vodák, Lubomír. « Návrh okruhu HSŘ traktoru Maxterra ». Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2009. http://www.nusl.cz/ntk/nusl-228584.

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Theme of this diploma thesis is a design of a hydrostatic steering circuit of the Maxterra tractor, where the working medium is oil from the gearbox. Part of the design is also check calculation of the hydrostatic circuit of the steering. Next part is also the design of the steering column. The circuit of the hydrostatic steering and the steering column will be used on the new Zetor Maxterra tractor.

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Hugosson, Conny, Omer Kayani et Mark Krieg. « Customer focused development of a variable bent-axis pump/motor for open circuit hydrostatic transmissions, e.g. in hydraulic hybrid drives ». Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-200062.

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The paper presents the development methodology of a hydrostatic pump/motor for use in Parker Hannifin’s advanced series hydraulic hybrid transmissions for medium and heavy duty commercial vehicles. With Parker’s established bent-axis pump/motor technology for heavy duty mobile applications as a basis, it describes the main stages of further development and qualification for demanding automotive main drive transmissions. Parker’s APQP based, customer focused product development model was employed for this development which resulted in the variable bent-axis pump/motor C24 for open circuit hydrostatic transmissions. Positive customer results from a large fleet of in-service refuse collection trucks and parcel delivery vans with Parker advanced hydraulic hybrid drive systems using C24 pumps/motors serve as evidence of Parker’s product development model effectiveness. High reliability, good fuel economy, increased productivity and long brake life of the vehicles can directly be traced back to the streamlined, front-loaded and iterative development model.

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League, Richard B. « Bond graph model and computer simulation of a hydrostatic drive test stand ». Thesis, Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/50042.

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A hydrostatic drive test stand was constructed to aid in the instruction of the characteristics of hydrostatic transmissions and to develop a time-varying load in a shaft to compare torque transducers. A mathematical model of the device was derived using the bond graph approach and was implemented using the Advanced Continuous Simulation Language (ACSL). The test stand was used to obtain experimental data to try to refine the model parameters. To facilitate the measurement of system flows, a microprocessor-based digital flow indicator was developed. Steady-state tests were performed at various constant pump swashplate angles; for the dynamic tests, the pump swashplate angle was cycled from zero degrees to 6.5 degrees.
Master of Science
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Chapitres de livres sur le sujet "Hydrostatic circuit"

Vardhan, Alok, K. Dasgupta et Mohit Bhola. « Experimental Study on the Steady-State Performance of Closed-Circuit Hydrostatic Transmission Drives for the Rotary Head of Blast Hole Drill Machine Using Different Capacities Bent Axis Hydro-Motor ». Dans Lecture Notes in Mechanical Engineering, 93–103. Singapore : Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-6469-3_9.

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Cundiff, John S., et Michael F. Kocher. « Hydrostatic Transmissions ». Dans Fluid Power Circuits and Controls, 205–74. CRC Press, 2019. http://dx.doi.org/10.1201/9780429183706-6.

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« Hydrostatic Transmissions ». Dans Fluid Power Circuits and Controls, 213–90. CRC Press, 2001. http://dx.doi.org/10.1201/9781420041330-11.

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« Hydrostatic Transmissions ». Dans Fluid Power Circuits and Controls, 193–270. CRC Press, 2001. http://dx.doi.org/10.1201/9781420041330.ch6.

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Actes de conférences sur le sujet "Hydrostatic circuit"

Yun, So-Nam, Jung-Ho Park, Sung-Soo Lee et Choong-Mok Yoo. « Hydraulic circuit analysis for the electro-hydrostatic actuator system ». Dans 2016 16th International Conference on Control, Automation and Systems (ICCAS). IEEE, 2016. http://dx.doi.org/10.1109/iccas.2016.7832317.

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Wiens, Travis, et Douglas Bitner. « An Efficient, High Performance and Low-Cost Energy Recovering Hydrostatic Linear Actuator Concept ». Dans BATH/ASME 2016 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/fpmc2016-1775.

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Hydrostatic or closed-circuit pump-controlled hydraulic systems are attractive due to their high energy efficiency; their lack of throttling losses and ability to recover energy onto the pump shaft have made them a common design choice in systems using rotary actuators such as ground drive transmissions. However, the natural asymmetrical flow of typical hydraulic cylinders have prevented the widespread adoption of closed-circuit systems for linear actuators. Some hydrostatic linear actuator systems have been developed, but these suffer from a large dead volume and reduced force if using a symmetrical dual rod cylinder, or increased cost and complexity if using a specialized cylinder geometry or flow balancing circuits. This paper presents a concept system which uses a pair of common single-rod hydraulic cylinders to achieve the efficiency of a pump-controlled hydrostatic system with the opportunity for energy recovery. The system’s available force is equal to a standard valve-controlled system with a greater maximum velocity. This is achieved using only commercially-available components. The paper will present an analysis of the theoretical energy recovery potential over a representative work cycle for a hydraulic excavator. It will also present a controller design analysis and experimental verification.

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Liu, Zhengxing, et Hongyun Li. « Dynamic Response Control of Piezoelastic Laminated Cylindrical Shells Under Hydrostatic Pressure ». Dans ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-33574.

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Based on classical laminated plate theory and Navier solutions, the control of the piezoelastic laminated cylindrical shell’s dynamic response under hydrostatic pressure is discussed in this paper. Considering the direct and inverse piezoelectric effects of piezoelectric materials and from Hamilton’s principle, the nonlinear dynamic equations of the piezoelastic laminated cylindrical shell are derived first. Using close circuit method, the charge enclosed in the piezoelectric sensor layer can be measured. Furthermore, the voltage applied on the actuator layer can be obtained based on the closed-circuit charge signal of the sensor and velocity negative feedback control algorithm. An active dynamic response control model of simply supported laminated cylindrical shells with piezoelectric sensor/actuator under various dynamic loads is established in this paper at last. Three types of loading conditions, namely sinusoidal distributed load, line load and moving point load, are considered in numerical examples to investigate the performance of the control model. The numerical results show that the active control model presented in this paper can suppress the vibration of the structure under dynamic loading effectively.

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Deur, Josˇko, Vladimir Ivanovic´, Josˇko Petric´, Matthew Hancock et Francis Assadian. « A Control-Oriented Model of Hydrostatic Transmission With Application on Torque Vectoring Differential Modeling ». Dans ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-67394.

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The paper presents a control-oriented model of a closed circuit hydrostatic transmission. The model includes the pump speed, motor speed, and pressure difference state variables, and nonlinear static maps for the flow loss resistance and pump and motor torque losses. The model maps are obtained by experimental identification conducted on a hydrostatic transmission setup. The model is validated against the experimental data for a wide range of operating conditions. The validated model is used for bond graph modeling and analysis of a hydrostatic transmission-based torque vectoring differential. The torque vectoring features are illustrated by computer simulation.

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Kohma¨scher, Torsten, Robert Rahmfeld, Hubertus Murrenhoff et Eckhard Skirde. « Improved Loss Modeling of Hydrostatic Units : Requirement for Precise Simulation of Mobile Working Machine Drivelines ». Dans ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-41803.

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The aim of this paper is to analyze different loss modeling methods for hydrostatic pumps and motors as an input for dynamic system simulation. Using dynamic simulation in an early design phase allows for optimization of driveline, driveline control and working hydraulic within several operating conditions. Using precise loss modeling methods enables prediction of energy consumption and energy losses over various duty cycles. Rising energy costs, enhanced government guidelines and increased environmental awareness require more efficient drive concepts especially in mobile working machines. Because of the complex machine structure with numerous hydraulic power consumers, like driveline, working, steering and braking hydraulic, dynamic system simulation is a need in the early design phase. This paper focuses on partial and full hydrostatic drivelines of mobile working machines which operate mostly on basis of a closed circuit hydrostatic transmission. Hydrostatic power lines connect pump and motor directly without additional losses because of valves or system characteristics. Therefore losses in the hydrostatic units have major relevance for the loss behavior of the hydrostatic transmission. The use of precise loss models is essential for analyzing hydrostatic transmission by means of dynamic system simulation. In the scope of this paper, one physical-empiric and four mathematical loss modeling methods are introduced, investigated and compared. Finally, the most promising modeling method is used for the simulation of a state of the art hydrostatic transmission.

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Zavadinka, Peter, et Robert Grepl. « Energy Saving Potential of a Hydrostatic Drivetrain With Variable Charge Pump ». Dans 8th FPNI Ph.D Symposium on Fluid Power. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/fpni2014-7844.

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This paper deals with the power saving prediction of hydrostatic drivetrains achieved with a variable roller charge pump. Focusing on the charge pump in a hydrostatic transmission, shows, that fixed pumps don’t act in all operating conditions very efficient. The charge pump delivers in some conditions a higher flow than required. The unused energy is dissipated into heat. According to this assumption, using variable charge pump is another possible way to save energy. In the end it means reduce fuel consumption. Generally, the power saving potential is depending on the application, but two main factors can be highlighted: the first one is the charge pump size and the second is the application of an intelligent loop flushing system. The standard loop flushing system demands more cooling flow than required in some conditions, but a variable charge pump is able to more efficiently cover demands of intelligent loop flushing system. The power saving potential will be analyzed for two different example systems/vehicles in their typical operation conditions. All analyses are made with simulation models, which include simplified thermal behavior of the hydraulic circuit, also. The results in this paper confirmed the power saving potential for different applications with bigger charge pumps with an intelligent loop flushing function could be the most interesting applications.

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Deldar, Majid, Afshin Izadian et Sohel Anwar. « Configuration Analysis and Design of a Wind Turbine With Hydrostatic Transmission System ». Dans ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-67307.

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This paper presents a methodology for designing and dimensioning of hydrostatic transmission system (HTS) configurations for wind turbines. HTS provides an alternative method to the gearbox in wind power applications. It decouples the turbine and the generator such that the generator can be driven at synchronous speed regardless of wind speed variation. A comparison of different HTS configurations shows that the functionality and performance of the proposed system depends on proper dimensioning of hydraulic components and the circuit configuration. Practical constraints of wind turbine and hydraulic technologies are considered in the design to configure an industrial scale system. The design objectives include obtaining the maximum system efficiency at the rated and high efficiency at partial load. Different hydrostatic systems were designed and simulated to show potentials for improving the overall efficiency of wind power using HTS. It was shown that the larger swept area and moderate speed generator improve efficiency of hydrostatic drivetrain. Optimization of the entire HTSWT can improve output power from a HTSWT to an extent that its annual energy production (AEP) becomes closely equal to AEP of a geared WT.

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Aakre, Shaun R., et Ian W. Jentz. « Welded Attachments and Hydrostatic Pressure Testing Rules for Diffusion Bonded Heat Exchangers ». Dans ASME 2020 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/pvp2020-21299.

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Abstract The mission of the U.S. Department of Energy (DOE), Office of Nuclear Energy is to advance nuclear power in order to meet the nation’s energy, environmental, and energy security needs. Advanced high temperature reactor systems will require compact heat exchangers (CHX) for the next generation of nuclear reactor plant designs. A necessary step for achieving this objective is to ensure that the ASME Boiler and Pressure Vessel Code, Section III, Division 5 has rules for the construction of CHXs for nuclear service. Construction of Alloy 800H diffusion bonded Printed Circuit Heat Exchangers (PCHEs) involves multiple controlled welding processes. The primary diffusion bonding process creates a uniformly bonded PCHE body featuring a microchannel core. Secondary welding processes are needed to attach headers and nozzles to the PCHE body, forming a complete CHX. The quality of these welding processes is ensured by following the appropriate ASME Section IX weld qualification procedures. Experience in constructing both 316L and 800H PCHEs has given a set of acceptable attachment weld configurations and procedures. Headers were attached to the diffusion bonded block surface using full penetration welds, as required by Class A design. The integrity of these attachment welds was demonstrated through hydrostatic pressure testing.

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Martelli, Massimo, Pietro Marani et Silvia Gessi. « Series, Parallel, and Hybrid Series-Parallel Hydrostatic Transmission Architectures for Ground Locomotion ». Dans ASME/BATH 2019 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/fpmc2019-1690.

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Abstract Ground locomotion of wheeled vehicles, in all-wheel drive configuration, is subject to unique, generally highly variable and not predictable, loading conditions on the driveline subsystem. Any sensible design must cope at least with the effects induced by slope changes, asymmetrical losses of adherence and cornering maneuvers. When severe constraints on the driveline layout make the implementation of standard mechanical transmissions unfeasible, a typical option is given by compound hydrostatic transmission architectures, with multiple dedicated motor-wheels. Requirements are then defined on two different levels: at vehicle level, traction functionality must never be lost; at hydraulic circuit level, all components must work within their nominal operating ranges and hydraulic stresses must be limited. Common standard topologies for motor connection, viz. series and parallel, come with different strengths and weaknesses, often requiring the implementation of auxiliary highly dissipative compensation components and/or complex electronic control, while a hybrid series-parallel concept, derived from a patented application, based on three-port motors allows the implementation of an effective, purely hydraulic system. In the present work, a general comparison of the above-mentioned architectures is provided, by means of numerical simulation, over a wide set of virtual experiments. Each architecture is analyzed: its specific features are described and the correlation between hydraulic performance/specifications and vehicle traction performance is pointed out.

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Ellman, A., H. Kauranne, J. Kajaste et M. Pietola. « Effect of Parameter Uncertainty on Reliability of Hydraulic Transmission System Simulation ». Dans 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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Rapports d'organisations sur le sujet "Hydrostatic circuit"

Clarke, John R. Optimal Hydrostatic Loading for Closed-Circuit Underwater Breathing Apparatus Design. Fort Belvoir, VA : Defense Technical Information Center, mars 1991. http://dx.doi.org/10.21236/ada234290.

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