Abstract

This paper designed and optimized a bidirectional three-port valve plate structure for solving the matching problem of flow rate and pressure in the aerospace pump-controlled differential hydraulic cylinder. This design aims to make the valve plate work well under the bidirectional high-speed condition. The model was set up using dynamic mesh and sliding mesh, and the simulation is conducted by FLUENT. In addition, the flow field of inlet and outlet flow rate pulsations, pressure pulsation in cylinder, and non-dead-point transition zone of four cases are analyzed to optimize the valve plate in this work. The numerical results show that different angles of non-dead-point transition zones of the valve plate have a big impact on the performance of the piston pump. For example, the flow rate pulsation reaches the minimum when the angle of non-dead point transition zone is greater than or equal to the angle of a cylinder port. However, at this time, the closed compression would occur and the pressure inside the cylinder would rise rapidly as the piston moves to the non-dead point zone, thus resulting in serious pressure overshoot. In addition, if the angle of non-dead point transition zone is reduced within a certain range, the pressure overshoot will be reduced drastically, and the flow pulsation rate will rise a bit. The study suggests that it is necessary to adjust the angle of non-dead point transition zone to balance the pressure overshoot and flow pulsation of the pump to obtain the optimal kidney structure of the valve plate.

Highlights

  • An Electro-Hydrostatic actuator (EHA) is a popular energy-saving strategy for industrial machine design. It integrates a feedback unit, servo motor, control electronics, variable speed pump and a cylinder into a compact self-contained unit requiring only electronic power. It was originally developed for aerospace [1] and has been popular in other industries

  • 1) this studied in this in paper paper is suitable for the aerospace field, with the characteristics of small displacement, is suitable for the aerospace with field, the characteristics of small displacement, high ro- high rois suitable for the field, aerospace with the characteristics of small displacement, highand rotational speed, and bidirectional rotation

  • B of ofthree-port three-portpiston pistonpump pump connected to two chambers the metric cylinder

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Summary

Introduction

An Electro-Hydrostatic actuator (EHA) is a popular energy-saving strategy for industrial machine design. It integrates a feedback unit, servo motor, control electronics, variable speed pump and a cylinder into a compact self-contained unit requiring only electronic power. It was originally developed for aerospace [1] and has been popular in other industries One of the challenges in EHAs is to control asymmetrical inlet and outlet flow rate for two differential hydraulic chambers with different volumes [8,9]. Wang et al introduced a novel flow control circuit, discusses the stability of the system, and has good robustness [12]

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