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PI-type Iterative Learning Control for Nonlinear electro-hydraulic Servo Vibrating System

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Chinese Journal of Mechanical Engineering 2009年第3期22卷 451-455页

作者： LUO Xiaohui ZHU Yuquan HU Junhua School of Mechanical Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China

For the electro-hydraulic servo vibrating system（ESVS） with the characteristics of non-linearity and repeating motion, a novel method, PI-type iterative learning control（ILC）, is proposed on the basis of traditional PID control. By using memory ability of computer, the method keeps last time＇s tracking error of the system and then applies the error information to the next time＇s control process. At the same time, a forgetting factor and a D-type learning law of feedforward fuzzy-inferring referenced displacement error under the optimal objective are employed to enhance the systemic robustness and tracking accuracy. The results of simulation and test reveal that the algorithm has a trait of high repeating precision, and could restrain the influence of nonlinear factors like leaking, external disturbance, aerated oil, etc. Compared with traditional PID control, it could better meet the requirement of nonlinear electro -hydraulic servo vibrating system.

关键词： electro-hydraulic vibrating system PI iterative learning forgetting factor fuzzy inference

Vehicle roll stability control with active roll-resistant electro-hydraulic suspension

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Frontiers of Mechanical Engineering 2020年第1期15卷 43-54页

作者： Lijun XIAO Ming WANG Bangji ZHANG Zhihua ZHONG State Key Laboratory of Advanced Design and Manufacture for Vehicle Body Hunan UniversityChangsha 410082China

This study examines roll stability control for vehicles with an active roll-resistant electro-hydraulic suspension(RREHS)subsystem under steering maneuvers.First,we derive a vehicle model with four degrees of freedom and incorporates yaw and roll motions.Second,an optimal linear quadratic regulator controller is obtained in consideration of dynamic vehicle performance.Third,an RREHS subsystem with an electric servo-valve actuator is proposed,and the corresponding dynamic equations are obtained.Fourth,field experiments are conducted to validate the performance of the vehicle model under sine-wave and double-lane-change steering maneuvers.Finally,the effectiveness of the active RREHS is determined by examining vehicle responses under sine-wave and double-lane-change maneuvers.The enhancement in vehicle roll stability through the RREHS subsystem is also verified.

关键词： electro-hydraulic suspension roll stability LQR experiment

A New Type of Automotive Braking Actuator for Decentralized electro-hydraulic Braking System

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Journal of Harbin Institute of Technology(New Series) 2014年第1期21卷 1-6页

作者： Liang-Xu Ma Liang-Yao Yu Zhi-Zhong Wang Jian Song State Key Laboratory of Automotive Safety and Energy Tsinghua University

This paper presents a new type of automotive braking actuator for a kind of brake-by-wire system called decentralized electro-hydraulic braking system( DEHB) to replace the traditional automobile braking system. The actuator of this system is driven by an electrical motor instead of the conventional vacuum booster to make the brake pressure be linearity controlled quickly. Therefore,the system has the advantages of quick response speed,good control performance and simple structure. Firstly,an overview of the actuator and the whole DEHB system is shown. Secondly,the possibility of this new kind of actuator working for the system is ensured based on some braking theories. Thirdly,the appropriate dynamic simulations are done to get some results to show the relations of different parameters and the effect of braking. Eventually,the proper parameters are determined to build a test bench which shows that DEHB system can achieve the maximum pressure of 13 MPa within 100 ms after parametric optimization,and meanwhile,the actuator is able to reduce pressure quickly after maintaining high pressure. All of the bench test results can meet with the design requirements and real demand of vehicle and this actuator may improve vehicle braking effect in the future. Besides,this actuator can be widely applied to the regenerative braking system because of its linear braking performance.

关键词： vehicle brake-by-wire decentralized electro-hydraulic braking system braking actuator

APPROACH　TO　FAULT　DETECTION　AND　DIAGNOSIS　OF　NONLINEAR　electro-hydraulic　SERVO　SYSTEM

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Chinese Journal of Mechanical Engineering 1997年第1期10卷 54-59页

ＡＰＰＲＯＡＣＨＴＯＦＡＵＬＴＤＥＴＥＣＴＩＯＮＡＮＤＤＩＡＧＮＯＳＩＳＯＦＮＯＮＬＩＮＥＡＲＥＬＥＣＴＲＯ－ＨＹＤＲＡＵＬＩＣＳＥＲＶＯＳＹＳＴＥＭＺｈａｎｇＪｉａｎｈｕａ，ＬｉＹｕｎｈｕａ，ＷａｎｇＺｈａｎｌｉｎ... 详细信息

ＡＰＰＲＯＡＣＨＴＯＦＡＵＬＴＤＥＴＥＣＴＩＯＮＡＮＤＤＩＡＧＮＯＳＩＳＯＦＮＯＮＬＩＮＥＡＲＥＬＥＣＴＲＯ－ＨＹＤＲＡＵＬＩＣＳＥＲＶＯＳＹＳＴＥＭＺｈａｎｇＪｉａｎｈｕａ，ＬｉＹｕｎｈｕａ，ＷａｎｇＺｈａｎｌｉｎＢｅｉｊｉｎｇＵｎｉｖｅｒｓｉｔｙ...

关键词：自适应控制王占林 AND APPROACH DETECTION DIAGNOSIS electro-hydraulic FAULT NONLINEAR OF SERVO SYSTEM

Analysis on Static Pressure Bearing Seal Characteristics of Guide Sleeve of electro-hydraulic Servo Cylinder

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International Journal of Plant Engineering and Management 2019年第3期24卷 140-156页

作者： SHAO Junpeng XU Longfei SUN Guitao School of Mechanical and Engineering Harbin University of Science and Technology

As a typical bionic walking robot, hydraulic quadruped robot has attracted much attention because of its high mobility, strong load capacity and steady motion. The electro-hydraulic servo cylinder, as its power actuator, requires low friction, good lateral load resistance and high speed motion. The electro-hydraulic servo cylinder hydrostatic bearing seal guide sleeve is taken as the research object in this paper. By using Fluent software to analyze and contrast the film characteristics of rectangular and I-shaped oil chamber of hydrostatic bearing seal guide sleeve, the relationship between piston rod moving speed, eccentricity, oil film carrying capacity, friction force and leakage volume, as well as the relationship between oil feed flow and oil film bearing capacity, friction force, inlet pressure and leakage volume were analyzed. This study provides a theoretical basis for optimizing the static pressure bearing seal parameters.

关键词： hydraulic quadruped robot electro-hydraulic servo cylinder static pressure bearing seal guide sleeve characteristics of oil film Fluent simulation analysis

Investigation of Semi-Active Hydro-Pneumatic Suspension for a Heavy Vehicle Based on electro-hydraulic Proportional Valve

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World Journal of Engineering and Technology 2017年第4期5卷 696-706页

作者： Wenchao Yue Shoucheng Li Xiaojun Zou NAVECO Ltd. Nanjing China School of Mechanical Engineering Nanjing University of Science and Technology Nanjing China

Hydro-pneumatic suspension is widely used in heavy vehicles due to its nonlinear characteristics of stiffness and damping. However, the conventional passive hydro-pneumatic suspension can’t adjust parameters according to the complicated road environment of heavy vehicles to fulfill the requirements of the vehicle ride comfort. In this paper, a semi-active hydro-pneumatic suspension system based on the electro-hydraulic proportional valve control is proposed, and fuzzy control is used as the control strategy to adjust the?damping force of the semi-active hydro-pneumatic suspension. A 1/4?semi-active hydro-pneumatic suspension model is established, which is co-simulated with AMESim and MATLAB/Simulink. The co-simulation results show that the semi-active hydro-pneumatic suspension system can significantly reduce vibration of the vehicle body, and improve the suspension performance comparing with passive hydro-pneumatic suspension.

关键词： Hydro-Pneumatic Suspension Semi-Active Control Co-Simulation electro-hydraulic Proportional Valve

Adaptive fuzzy integral sliding mode velocity control for the cutting system of a trench cutter

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Frontiers of Information Technology & electronic Engineering 2016年第1期17卷 55-66页

作者： Qi-yan TIAN Jian-hua WEI Jin-hui FANG Kai GUO State Key Laboratory of Fluid Power&Mechatronic Systems Zhejiang UniversityHangzhou 310027China

This paper presents a velocity controller for the cutting system of a trench cutter(TC). The cutting velocity of a cutting system is affected by the unknown load characteristics of rock and soil. In addition, geological conditions vary with time. Due to the complex load characteristics of rock and soil, the cutting load torque of a cutter is related to the geological conditions and the feeding velocity of the cutter. Moreover, a cutter's dynamic model is subjected to uncertainties with unknown effects on its function. In this study, to deal with the particular characteristics of a cutting system, a novel adaptive fuzzy integral sliding mode control(AFISMC) is designed for controlling cutting velocity. The model combines the robust characteristics of an integral sliding mode controller with the adaptive adjusting characteristics of an adaptive fuzzy controller. The AFISMC cutting velocity controller is synthesized using the backstepping technique. The stability of the whole system including the fuzzy inference system, integral sliding mode controller, and the cutting system is proven using the Lyapunov theory. Experiments have been conducted on a TC test bench with the AFISMC under different operating conditions. The experimental results demonstrate that the proposed AFISMC cutting velocity controller gives a superior and robust velocity tracking performance.

关键词： Cutting system, electro-hydraulic system, Cutting velocity control, Adaptive fuzzy integral sliding mode control

Research on electro-hydraulic Servo Passive force control based on ADRC

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Research on Electro-hydraulic Servo Passive force control ba...

A method to perform prognostics in electro-hydraulic machines: the case of an independent metering controlled hydraulic crane

第37届中国控制会议

作者： MingXin Shi ShouKun Wang Hu Liu JunZheng Wang Beijing Institute of Technology Key Laboratory of Servo Motion System Drive and Control

electro-hydraulic servo passive force loading system is a typical position disturbance force control system.Due to the strong external disturbances in the loading system,large number of extra force will appear.The introduction of extra force will seriously affect the system’s force tracking accuracy and control effect.The electro-hydraulic servo passive force loading system has the characteristics of time-varying,nonlinear and strong external disturbances.In order to compensate and eliminate the external disturbances effectively,this paper adopts ADRC technology to control it.The electro-hydraulic servo system is token as the research object.The generation of extra force,the composition and working principle of ADRC controller,parameter tuning rules are analyzed in detail.Finally compares the PID control method with ADRC control method through experiment,confirming that the ADRC algorithms superiority in the passive force load electro-hydraulic servo system.

关键词： electro-hydraulic Passive force loaded control Extra force ADRC

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International Journal of Hydromechatronics 2018年第2期1卷 2-2页

作者： Yuri Ghini Andrea Vacca Purdue Univ Maha Fluid Power Res Ctr W Lafayette IN 47907 USA

Remaining useful life (RUL) estimation is a topic that has gained more and more attention in the field of fluid power systems, thanks to the tremendous potentials shown for improving safety and reduced production losses. However, many challenges related to RUL estimation are not solved yet, mainly connected to the definition of the health status of each component. A prognostic method based on a data-driven methodology for hydraulic systems is here proposed to estimate the percentage of life already spent by the monitored components. The potentials of the methodology are shown considering the case of a truck-mounted hydraulic crane, for which a simulation model was available.

关键词： perform prognostics electro-hydraulic machines independent metering controlled hydraulic crane