Experimental Investigation of an Electro-Hydrostatic Actuator Based on the Novel Active Compensation Method

Wang, Mingkang; Wang, Yan; Fu, Yongling; Yang, Rongrong; Zhao, Jingcheng; Fu, Jian

doi:10.1109/access.2020.3021104

Cited by 12 publications

(7 citation statements)

References 32 publications

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“…In Wang et al [56], the results of tests on electro hydrostatic reticulation using four-loop cascade control based on the actinic interference compensation method were presented. This method resulted in better durability (by about 35%) and a reduction of static state error (by about 33%).…”

Section: Braking With a Frequency Invertermentioning

confidence: 99%

Energy Efficiency and Limitations of the Methods of Controlling the Hydraulic Cylinder Piston Rod under Various Load Conditions

2021

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The article is an overview of various methods of braking and controlling the movement of the piston rod under various load conditions. The purpose of this review is to systematize the state of the art in terms of efficiency, energy consumption and limitations of each method. The article discusses systems with different types of hydraulic actuators, operating under passive, active and variable load during the duty cycle of the piston rod. The existing literature was analysed in terms of applicability, reduction of energy consumption of the systems and even the possibility of energy return. Attention was paid to the costs and the need for additional power sources, as well as the problems and limitations of the presented methods. Based on the simulation model, energy consumption tests were carried out in systems with an actuator loaded with a variable force. There is a comparison of all methods in terms of actuator type, load, energy consumption and the possibility of energy recovery.

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Section: Braking With a Frequency Invertermentioning

confidence: 99%

Energy Efficiency and Limitations of the Methods of Controlling the Hydraulic Cylinder Piston Rod under Various Load Conditions

2021

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“…They also designed an estimation method for the unknown parameters of the LuGre model and the unmeasured internal state of the EHA. Wang et al [20] proposed a high-gain disturbance observer to estimate and compensate for the friction inside the actuator.…”

Section: Introductionmentioning

confidence: 99%

An adaptive dead zone compensation control method for EHAs under low-speed conditions

Zhou

Sun

Liu

et al. 2022

Preprint

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This paper proposes an accurate dead zone compensation control method for electro-hydrostatic actuators (EHAs) under low-speed conditions. Specifically, the nonlinear dead zone characteristics under low-speed conditions are summarized based on many EHA experiments. Then, an adaptive compensation function (ACF) for the dead zone is constructed. Next, based on the established EHA model, this paper proposes an adaptive dead zone compensation control method for EHAs by combining ACF with the virtual decomposition controller (VDC). The stability of the proposed control method is also proved. Finally, the proposed control method is verified by the EHA platform. Test results show that the dead zone trajectory tracking error of EHA is significantly reduced when combined with ACF. Furthermore, since most EHAs are controlled by adjusting the motor speed, the method presented in this paper is simpler and easier to use than methods that employ flow compensation.

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“…The research of EHA system has focused on achieving higher energy efficiency by modifying it to have a structure for energy storage and energy regeneration. [10]- [14] Nevertheless, systematic limitations of EHA apparently still exist: 1) the dynamic response is limited due to the high rotational inertia of its servomotor and bidirectional pump [15]; 2) pump nonlinearities, including dead zones and friction, can degrade the system performance; and 3) even pilot-operated check valves (POCVs), which passively compensate for the difference in the control volumes, may slow the actuation of the system due to pressure-based operating conditions [16]. To address the response limitations, [17], [18] replaced the POCVs with limited throttling compensating valves to improve the performance of the EHA system over the entire operating range.…”

Section: Introductionmentioning

confidence: 99%

Improving the Response of an Electrohydrostatic Actuation (EHA) System Using a High-Pressure Accumulator

et al. 2022

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This paper proposes an (EHA) system driven in three modes to improve the low reactivity of the existing EHA system. By using a small high-pressure accumulator, servo valve, and mode switching valve, the circuits can be changed so that they are suitable for each mode according to the driving conditions. Each of the three modes consists of the EHA mode, the hybrid mode, and the charging mode, and the EHA mode operates on the same principle as the existing EHA system. The hybrid mode is activated when high-speed position control is performed, and with the help of an add-on servo valve controller, the control volume of the hydraulic cylinder can be stiffened quickly while minimizing the use of high-pressure fluids. The charge mode serves to periodically charge the accumulator under motionless conditions in applications that allow piston holding. Simulations and experiments confirm that the responsiveness of the proposed system is much improved compared to that of the existing EHA system.INDEX TERMS Electrohydrostatic actuation, high-pressure accumulator, hybrid actuation, add-on control, cylinder holding.

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Experimental Investigation of an Electro-Hydrostatic Actuator Based on the Novel Active Compensation Method

Cited by 12 publications

References 32 publications

Energy Efficiency and Limitations of the Methods of Controlling the Hydraulic Cylinder Piston Rod under Various Load Conditions

Energy Efficiency and Limitations of the Methods of Controlling the Hydraulic Cylinder Piston Rod under Various Load Conditions

An adaptive dead zone compensation control method for EHAs under low-speed conditions

Improving the Response of an Electrohydrostatic Actuation (EHA) System Using a High-Pressure Accumulator

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