Download or read book Modeling and Experimental Evaluation of a Load Sensing and Pressure Compensated Hydraulic System written by Duqiang Wu and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Modeling and Experimental Evaluation of a Load sensing and Pressure Compensated Hydraulic System written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Heavy load equipment, such as tractors, shovels, cranes, airplanes, etc, often employ fluid power (i.e. hydraulic) systems to control their loads by way of valve adjustment in a pump-valve control configuration. Most of these systems have low energy efficiency as a consequence of pressure losses across throttle valves. Much of the energy is converted into heat energy which can have determinantal effects on component life and the surrounding environment. From an energy efficiency point of view, an ideal hydraulic system is one that does not include any throttling valve. One such circuit is made of a variable pump and motor load (pump/motor configuration). The velocity of the load is controlled by manipulating the pump displacement or by changing the rotary speed of the pump shaft. In such a system, the transient response of the load is often unsatisfactory because it is difficult to quickly and accurately manipulate the pump displacement or change shaft speed. Thus circuit design must be a compromise between the energy efficiency of the pump/motor system and the controllability of a pump/valve/motor combination. One possible compromise is to use a pump-valve configuration which reduces energy losses across the valve. One way to achieve this is by controlling the pressure drop across the valve and limiting it to a small value, independent of load pressure. Based on this idea, a type of hydraulic control system, usually called load-sensing (LS), has recently been used in the flow power area. This type of system, however, is complex and under certain operating conditions exhibits instability problems. Methods for compensating these instabilities are usually based on a trial-and-error approach. Although some research has resulted in the definition of some instability criterion, a comprehensive and verifiable approach is still lacking. This research concentrates on identifying the relationship between system parameters and instability in one particular type of LS system.
Download or read book Modeling and Experimental Evaluation of a Load sensing and Pressure Compensated Hydraulic System written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Heavy load equipment, such as tractors, shovels, cranes, airplanes, etc, often employ fluid power (i.e. hydraulic) systems to control their loads by way of valve adjustment in a pump-valve control configuration. Most of these systems have low energy efficiency as a consequence of pressure losses across throttle valves. Much of the energy is converted into heat energy which can have determinantal effects on component life and the surrounding environment. From an energy efficiency point of view, an ideal hydraulic system is one that does not include any throttling valve. One such circuit is made of a variable pump and motor load (pump/motor configuration). The velocity of the load is controlled by manipulating the pump displacement or by changing the rotary speed of the pump shaft. In such a system, the transient response of the load is often unsatisfactory because it is difficult to quickly and accurately manipulate the pump displacement or change shaft speed. Thus circuit design must be a compromise between the energy efficiency of the pump/motor system and the controllability of a pump/valve/motor combination. One possible compromise is to use a pump-valve configuration which reduces energy losses across the valve. One way to achieve this is by controlling the pressure drop across the valve and limiting it to a small value, independent of load pressure. Based on this idea, a type of hydraulic control system, usually called load-sensing (LS), has recently been used in the flow power area. This type of system, however, is complex and under certain operating conditions exhibits instability problems. Methods for compensating these instabilities are usually based on a trial-and-error approach. Although some research has resulted in the definition of some instability criterion, a comprehensive and verifiable approach is still lacking. This research concentrates on identifying the relationship between system parameters and instability in one particular type of LS system.
Download or read book Proceedings written by and published by . This book was released on 2005 with total page 840 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2004 with total page 754 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Experimental Modeling of a Hydraulic Load Sensing Pump Using Neural Networks written by and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The traditional method of modeling dynamics of a nonlinear hydraulic system is to develop mathematical describing equations based on "laws of nature". The development of these describing equations for a physical hydraulic system often requires that engineering intuition and a priori knowledge of the system be combined with mathematical properties of the equations. In addition, the problems of accurately measuring or defining physical parameters or coefficients have frequently restricted the interpretation of modeling results to specific operating points with very limited modeling accuracy. An alternative modeling approach is to establish or approximate mathematical relationships of a dynamic system based on observed input-output data. Neural networks have been a class of very attractive mathematical model structures that can be used to establish these mathematical relationships, because of their proven capabilities of approximating many nonlinear functions. The overall objective of the research in this study is to develop a neural network simulation package to assist designers in the simulation and configuration of hydraulic circuits. The specific objective of this thesis is to explore the capabilities of neural networks to approximate the nonlinear dynamics of a particular hydraulic component using an experimental approach. In this thesis, the use of partially recurrent neural networks with the conjugate gradient training algorithm to model a hydraulic load sensing pump was investigated. A simulation study was first conducted using "noise-free" data to examine the modeling errors in order to provide a clear insight into the mechanism of the modeling error accumulation over the transient state with a recurrent type of model structure. The established concepts and approach were then applied to experimentally model a load sensing pump. An experimental system was designed and constructed with particular attention paid to the design and generation of sufficiently rich i.
Download or read book A Steady state Experimental Analysis of a Pulsating Flow Hydraulic System written by D. G. Vandenberghe and published by . This book was released on 1970 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: In addition to the experimental investigations a preliminary theoretical analysis was carried out to determine some of the basic operating characteristics of the system and to provide direction for future studies. In particular, a solution to minimize the shift in the mean position of the transformer pistons during transient conditions (changes in system load flow) was sought. The theoretical analysis assumed an ideal system and an incompressible nonviscous fluid. The experimental results provide a means of obtaining the various component, and system, characteristics under steady-state conditions. (Author).
Download or read book A theoretical and experimental evaluation of the hydraulic analogy to gas flow written by Hans Ritter and published by . This book was released on 1954 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Hydraulic System Modeling to Facilitate Evaluation of Fault Tolerant Components written by James Woodrow Vinson and published by . This book was released on 1996 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1999 with total page 1020 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Hydraulic Power System Analysis written by Arthur Akers and published by CRC Press. This book was released on 2006-04-17 with total page 401 pages. Available in PDF, EPUB and Kindle. Book excerpt: The excitement and the glitz of mechatronics has shifted the engineering community's attention away from fluid power systems in recent years. However, fluid power still remains advantageous in many applications compared to electrical or mechanical power transmission methods. Designers are left with few practical resources to help in the design and
Download or read book Hydraulic Servo systems written by Mohieddine Jelali and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt: This up-to-date book details the basic concepts of many recent developments of nonlinear identification and nonlinear control, and their application to hydraulic servo-systems. It is very application-oriented and provides the reader with detailed working procedures and hints for implementation routines and software tools.
Download or read book Applied mechanics reviews written by and published by . This book was released on 1948 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Hydrostatic Transmission Systems written by Jerry Korn and published by . This book was released on 1969 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mechatronics 2019 Recent Advances Towards Industry 4 0 written by Roman Szewczyk and published by Springer Nature. This book was released on 2019-08-28 with total page 515 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book gathers papers presented at Mechatronics 2019, an international conference held in Warsaw, Poland, from September 16 to 18, 2019. The contributions discuss the numerous, multidisciplinary technological advances in the field of applied mechatronics that the emerging Industry 4.0 has already yielded. Each chapter presents a particular example of interdisciplinary theoretical knowledge, numerical modelling and simulation, or the application of artificial intelligence techniques. Further, the papers show how both software and physical devices can be incorporated into mechatronic systems to increase production efficiency and resource savings. The results and guidelines presented here will benefit both scientists and engineers looking for solutions to specific industrial and research problems.
Download or read book Recent Advances and Applications of Hybrid Simulation written by Wei Song and published by Frontiers Media SA. This book was released on 2021-01-13 with total page 213 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Engineering Index Annual written by and published by . This book was released on 1992 with total page 2264 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since its creation in 1884, Engineering Index has covered virtually every major engineering innovation from around the world. It serves as the historical record of virtually every major engineering innovation of the 20th century. Recent content is a vital resource for current awareness, new production information, technological forecasting and competitive intelligence. The world?s most comprehensive interdisciplinary engineering database, Engineering Index contains over 10.7 million records. Each year, over 500,000 new abstracts are added from over 5,000 scholarly journals, trade magazines, and conference proceedings. Coverage spans over 175 engineering disciplines from over 80 countries. Updated weekly.
