Design and Testing of a Linear-Driven Electro-Hydrostatic Actuator

Wang, Zimeng; Zhang, Jiao; Li, Xinglu

doi:10.1115/1.4044474

Cited by 6 publications

(6 citation statements)

References 16 publications

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“…Hence, a pump-controlled multi-actuator EHS should indeed be the most energy efficient, if dedicated pump–actuator pairs are used without any intermediate control valve. 6,36 A real-time control of a wheel loader was implemented by a VDP with a paired LS compensator and an SODCV, both in the flow line to the actuator. 6 This study compared such an implementation with control of both the VDP and the SODCV directly on the basis of the feedback from the operator.…”

Section: Literature Reviewmentioning

confidence: 99%

Energy-saving design of variable-displacement bi-directional pump-controlled electrohydraulic system

Hati¹,

Mandal

Sanyal

2020

Proceedings of the Institution of Mechanical Engineers, Part I:

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Losses in control valves drag down the average overall efficiency of electrohydraulic systems to only about 22% from nearly 75% for standard pump-motor sets. For achieving higher energy efficiency in slower systems, direct pump control replacing fast-response valve control is being put in place through variable-speed motors. Despite the promise of a quicker response, displacement control of pumps has seen slower progress for exhibiting undesired oscillation with respect to the demand in some situations. Hence, a mechatronic simulation-based design is taken up here for a variable-displacement pump–controlled system directly feeding a double-acting single-rod cylinder. The most significant innovation centers on designing an axial-piston pump with an electrohydraulic compensator for bi-directional swashing. An accumulator is conceived to handle the flow difference in the two sides across the load piston. A solenoid-driven sequence valve with P control is proposed for charging the accumulator along with setting its initial gas pressure by a feedforward design. Simple proportional–integral–derivative control of the compensator valve is considered in this exploratory study. Appropriate setting of the gains and critical sizing of the compensator has been obtained through a detailed parametric study aiming low integral absolute error. A notable finding of the simulation is the achievement of the concurrent minimum integral absolute error of 3.8 mm s and the maximum energy saving of 516 kJ with respect to a fixed-displacement pump. This is predicted for the combination of the circumferential port width of 2 mm for the compensator valve and the radial clearance of 40 µm between each compensator cylinder and the paired piston.

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Section: Literature Reviewmentioning

confidence: 99%

Energy-saving design of variable-displacement bi-directional pump-controlled electrohydraulic system

Hati¹,

Mandal

Sanyal

2020

Proceedings of the Institution of Mechanical Engineers, Part I:

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“…Wang et al used this pump to compose an EHA referred to as a linear-driven EHA (LEHA) and modeled the system by using an energetic macroscopic representation method [22]. This LEHA was kinematically simulated and the capability of its prototype was preliminarily tested [23].…”

Section: Introductionmentioning

confidence: 99%

“…The schematic of the actuator is illustrated in Figure 1 [23]. This actuator consists of two linear resonant motors, a linear pump, a hydraulic cylinder, an accumulator, several valves, and sensors.…”

Section: Introductionmentioning

confidence: 99%

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Design, Analysis, and Verification of an Electro- Hydrostatic Actuator for Distributed Actuation System

Zhang

Zimeng

2020

Sensors

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In order to provide a simplified and low-cost solution of the terminal for a distributed actuation system, this paper proposes an electro-hydrostatic actuator (EHA) based on the linear drive principle. The proposed actuator is directly driven by a linear pump with a collaborative rectification mechanism, whose performance relies on the collaboration of the internal two units. A pair of linear oscillating motors are employed to drive the two pump units respectively. The control of the actuator is based on the modulation of the oscillating amplitude, frequency, and phase difference of the two motors. The advantage of this actuator is that no more valve control is needed to rectify the linear pump besides the high efficiency of the direct pump drive. In this paper, both schematic and detailed structure of the actuator is presented. The kinematic and dynamic characteristics are analyzed and modeled, based on which the control method is proposed. The experiments verify the validity of the actuator structure and control.

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“…Jiao et al [7] invented the linear drive electro-hydrostatic actuator and experiments were conducted. The output cylinder produces the highest no-load output velocity of 62.2 mm/s and a maximum work pressure of 2.2 MPa [8].…”

Section: Introductionmentioning

confidence: 99%

Adaptive Repetitive Control of A Linear Oscillating Motor under Periodic Hydraulic Step Load

Zhang

et al. 2020

Sensors

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A linear oscillating motor has a direct and efficient linear motion output and is widely used in linear actuation systems. The motor is often applied to compact hybrid electrohydraulic actuators to drive a linear pump. However, the periodic switch of the rectification valve in the pump brings the hydraulic step load to the linear motor, which causes periodic oscillation waveform distortions. The distortion results in the reduction of pumping capacity. The conventional feedback proportional-integral-derivative control is applied to the pump, however, this solution cannot handle the step load as well as resolving nonlinear properties and uncertainties. In this paper, we introduce a nonlinear model to identify periodic hydraulic load. Then, the loads are broken up into a set of simple terms by Fourier series approximation. The uncertain terms and other modeling uncertainties are estimated and compensated by the practical adaptive controller. A robust control term is also developed to handle uncertain nonlinearities. The controller overcame drawbacks of conventional repetitive controllers, such as heavy memory requirements and noise sensitivity. The controller can achieve a prescribed final tracking accuracy under periodic hydraulic load via Lyapunov analysis. Finally, experimental results on the linear oscillating motor-pump are provided for validation of the effectiveness of the scheme.

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Design and Testing of a Linear-Driven Electro-Hydrostatic Actuator

Cited by 6 publications

References 16 publications

Energy-saving design of variable-displacement bi-directional pump-controlled electrohydraulic system

Energy-saving design of variable-displacement bi-directional pump-controlled electrohydraulic system

Design, Analysis, and Verification of an Electro- Hydrostatic Actuator for Distributed Actuation System

Adaptive Repetitive Control of A Linear Oscillating Motor under Periodic Hydraulic Step Load

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