Nonlinear dynamic analysis and control of a hydraulic press electro-hydraulic servo system

Hsieh, Chin-Tsung; Lai, Chien-Pang

doi:10.1177/1461348418813021

Cited by 11 publications

(9 citation statements)

References 19 publications

(21 reference statements)

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“…There are many research reports on electro-hydraulic position servo system and speed servo system at home and abroad. The application of control theory and various control strategies can improve the steady-state control accuracy and dynamic performance of the system [1][2][3][4][5][6][7] . However, there is still a problem that the symmetrical valve controlled asymmetric hydraulic cylinder has the problem of asymmetric control, especially in the control occasions with large load and high precision, and when the load changes in a wide range, this phenomenon is more prominent.…”

Section: Prefacementioning

confidence: 99%

Research on control strategy of asymmetric electro-hydraulic servo system based on improved PSO algorithm

et al. 2022

Advances in Mechanical Engineering

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In the electro-hydraulic servo control system, there are some problems, such as low position control accuracy, uncontrollable speed, speed impact, and asymmetric control due to the asymmetry of hydraulic cylinder. To solve the above problems, this paper proposes a Fuzzy PID control algorithm with load force compensation based on improved PSO optimization. This improved particle swarm optimization algorithm introduces crossover and mutation operations in genetic algorithm to improve the optimization performance of traditional particle swarm optimization algorithm. The mathematical model of valve controlled asymmetric cylinder is established, and the Amesim linearization analysis function is used to identify the system, establish the transfer function, and build the control system. The joint simulation and test results of Amesim and MATLAB show that the proposed control strategy can realize the simultaneous control of speed and position. Under different loads, different speeds, and different input follow signals, it does not need to adjust any parameters. Regardless of forward or reverse operation, the optimal dynamic performance and minimum steady-state error are obtained, which greatly improves the response speed of the system. The effectiveness and superiority of the improved PSO compound control strategy are verified.

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Section: Prefacementioning

confidence: 99%

Research on control strategy of asymmetric electro-hydraulic servo system based on improved PSO algorithm

et al. 2022

Advances in Mechanical Engineering

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“…Electro-hydraulic servo systems (EHSSs) have been widely used in industrial production such as robots (Taylor and Robertson, 2013), cranes (Jensen et al, 2020), and presses (Hsieh and Lai, 2018) in modern industry due to their high power-to-weight ratios compared to the electrical counterparts. In these industrial applications, the position control performance of the hydraulic actuator is an important evaluation index for the EHSS.…”

Section: Introductionmentioning

confidence: 99%

Robust output feedback control for electro-hydraulic servo system with error constraint based on high-order sliding mode observer

Wang

Zhao

et al. 2023

Transactions of the Institute of Measurement and Control

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In this paper, a robust output feedback controller with error constraint is proposed to improve the position tracking performance of the electro-hydraulic servo system. Since only the position signal of the system is available, a high-order sliding mode observer is designed to estimate the unobtainable system states. The new state observer can not only avoid the influence of sensor measurement noise but also reduce the chattering of traditional sliding mode observer. To cope with the modeling error, parameter uncertainty, and external disturbance, a robust controller based on backstepping method is designed. In addition, barrier Lyapunov function is introduced to limit the maximum tracking error to a preset range. Finally, comparative experiments are carried out on the asymmetric hydraulic cylinder test bench. The experimental result shows that the proposed controller has a satisfied tracking performance.

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“…Its performance determines the reliability, stability, accuracy, and green energy savings of the entire hydraulic system. The performance of the electrohydraulic proportional valve directly affects the quality and efficiency of the entire operation [1][2][3][4][5]. The main drawback of electrohydraulic proportional valves is their poor pressure-compensation stability, which cannot meet the operational requirements of modern agricultural equipment in complex and dynamic field environments.…”

Section: Introductionmentioning

confidence: 99%

An Analysis of the Static and Dynamic Behavior of the Hydraulic Compensation System of a Multichannel Valve

Xu¹,

Li²,

Cheng³

et al. 2023

Fluid Dynamics &Amp; Materials Processing

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Electro-hydraulic proportional valve is the core control valve in many hydraulic systems used in agricultural and engineering machinery. To address the problem related to the large throttling losses and poor stability typically associated with these valves, here, the beneficial effects of a triangular groove structure on the related hydraulic response are studied. A mathematical model of the pressure compensation system based on the power-bond graph method is introduced, and the AMESim software is used to simulate its response. The results show that the triangular groove structure increases the jet angle and effectively compensates for the hydrodynamic force. The steady-state differential pressure at the valve port of the new pressure compensation structure was 0.65 MPa. Furthermore, experimental results show that the pressure difference at the main valve port is 0.73 MPa, and that the response time is less than 0.2 s. It is concluded that the new compensation structure has good pressure compensation response characteristics.

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Nonlinear dynamic analysis and control of a hydraulic press electro-hydraulic servo system

Cited by 11 publications

References 19 publications

Research on control strategy of asymmetric electro-hydraulic servo system based on improved PSO algorithm

Research on control strategy of asymmetric electro-hydraulic servo system based on improved PSO algorithm

Robust output feedback control for electro-hydraulic servo system with error constraint based on high-order sliding mode observer

An Analysis of the Static and Dynamic Behavior of the Hydraulic Compensation System of a Multichannel Valve

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