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OPTIMIZED DESIGN OF hydraulic control PATTERN OF SYNCHRONOUS SYSTEM IN LARGE SCALE DIE-FORMING hydraulic PRESS

Transactions of Nonferrous Metals Society of China 1996年第1期6卷 125-129,140页

作者： Tan Jianping Zhong Jue Yan Jian Department of Mechanical Engineering Central South University of Technology 410083

The hydraulic control mode of the synchronous system in Chinese-built 300 MN dieforming hydraulic press was analysed *** improve the deficiency of the existing system,a series investigations were put forward,such as the controlling of inclination angular-velocity,the pre-estimating of compensation,the synchronous cylinder's pressure signal protection,ratio pressure control and changing flow control etc,to increase the system's control accuracy and reliability greatly.

关键词： synchronous system hydraulic control optimization

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A Multi-mode Electronic Load Sensing control Scheme with Power Limitation and Pressure Cut-off for Mobile Machinery

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Chinese Journal of Mechanical Engineering 2023年第1期36卷 157-170页

作者： Min Cheng Bolin Sun Ruqi Ding Bing Xu State Key Laboratory of Mechanical Transmissions Chongqing UniversityChongqing400044China Key Laboratory of Conveyance and Equipment Ministry of EducationEast China Jiaotong UniversityNanchang330052China State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang UniversityHangzhou310027China

In mobile machinery,hydro-mechanical pumps are increasingly replaced by electronically controlled pumps to improve the automation level,but diversified control functions(e.g.,power limitation and pressure cut-off)are integrated into the electronic controller only from the pump level,leading to the potential instability of the overall *** solve this problem,a multi-mode electrohydraulic load sensing(MELS)control scheme is proposed especially considering the switching stability from the system level,which includes four working modes of flow control,load sensing,power limitation,and pressure *** on the actual working requirements,the switching rules for the different modes and the switching direction(i.e.,the modes can be switched bilaterally or unilaterally)are *** priority of different modes is also defined,from high to low:pressure control,power limitation,load sensing,and flow *** multiple switching rules are satisfied at the same time,the system switches to the control mode with the highest *** addition,the switching stability between flow control and pressure control modes is analyzed,and the controller parameters that guarantee the switching stability are obtained.A comparative study is carried out based on a test rig with a 2-ton hydraulic *** results show that the MELS controller can achieve the control functions of proper flow supplement,power limitation,and pressure cut-off,which has good stability performance when switching between different control *** research proposes the MELS control method that realizes the stability of multi-mode switching of the hydraulic system of mobile machinery under different working conditions.

关键词： hydraulic control Load sensing Multi-Mode Power limitation Mobile machinery

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Research on Energy Conversion System of Floating Wave Energy Converter

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China Ocean Engineering 2014年第1期28卷 105-113页

作者：张亚群盛松伟游亚戈吴必军刘洋 Guangzhou Institute of Energy Conversion Chinese Academy of Sciences Key Laboratory of Renewable Energy and Gas Hydrate Chinese Academy Sciences Graduate College Chinese Academy of Sciences

A wave power device includes an energy harvesting system and a power take-off system. The power take-off system of a floating wave energy device is the key that converts wave energy into other forms. A set of hydraulic power take-off system, which suits for the floating wave energy devices, includes hydraulic system and power generation system. The hydraulic control system uses a special“self-hydraulic control system”to control hydraulic system to release or save energy under the maximum and the minimum pressures. The maximum pressure is enhanced to 23 MPa, the minimum to 9 MPa. Quite a few experiments show that the recent hydraulic system is evidently improved in efficiency and reliability than our previous one, that is expected to be great significant in the research and development of our prototype about wave energy conversion.

关键词： hydraulic power take-off system (PTO) second transfers conversion efficiency hydraulic control

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SOLUTION FOR PRESSURE DISTRIBUTION IN SQUEEZE FILM DAMPER WITH ELECTROhydraulic ACTIVE control

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Chinese Journal of Mechanical Engineering 1999年第1期12卷 28-32页

作者： Li Yunhua Wang Zhanlin Beijing University of Aeronautics and Astronautics Chen Jieli Taiwan Cheng Kung University Beijing Univ of Aeronautics and Astronautics Beijing China

Aiming at the problems existed in the squeeze film damper of the rotating machinery utilizing traditional passive dynamic pressure film bearing, a project of dynamic pressure and static pressure hybrid oil film bearing with piezoelectric crystal electrohydraulic active control supply orifice hole is proposed. For this kind of hybrid film bearing, the π film assumption can not hold true. In order to solve the pressure distribution, a new kind of solving method is proposed.

关键词： hydraulic control Squeeze film damper Rotor dynamics

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