Electrostatic hydraulic actuator driven by a magnetostrictive axial double-piston pump and its working method

Abstract

The invention relates to an electrostatic fluid actuator driven by a magnetostrictive axial double-piston pump and a working method thereof, and relates to the field of electrostatic fluid actuators, utilizing the output characteristics of a magnetostrictive piston pump combined with active flow distribution Valve, design the flow distribution scheme, realize the output of the continuous displacement of the actuator, and improve the flexibility of the actuator. The electrohydrostatic actuator driven by the magnetostrictive axial double-piston pump includes: a magnetostrictive electro-mechanical converter, an active distribution valve, an oil circuit block, a servo motor, and a hydraulic cylinder; The telescopic electro-mechanical converter passes a sinusoidal drive signal with the same amplitude and frequency and a phase difference of 180°, and the plungers in the two magnetostrictive electro-mechanical converters arranged parallel to the axis of the active distribution valve spool do reciprocating motions , The active distribution valve spool rectifies the oil in the pipeline through rotational movement, so that the hydraulic cylinder outputs continuous displacement under the action of pressure difference, and the two plunger pumps work at the same time, which greatly improves the uniformity of flow.

Description

technical field [0001] The invention relates to the technical field of electrostatic fluid actuators, in particular to an electrostatic fluid actuator driven by a magnetostrictive axial double-piston pump. Background technique [0002] In traditional aircraft, the hydraulic system is mainly used for the control of the aircraft's various wings, brakes, and landing gear. Compared with traditional hydraulic or pneumatic systems, the concept of Power-By-Wire (PBW) provides Higher power management efficiency. PBW technology is also one of the core technologies of the multi-electric aircraft control system. Electric actuation technology is used to replace the traditional centralized hydraulic control system, which has superior system control, lighter weight and convenient component maintenance. Electric actuation technology mainly includes electro-hydraulic actuators (Electro-Hydraulic Actuators, EHAs) and electro-mechanical actuators (Electro-Mechanical Actuators, EMAs). EMA do...

AI Technical Summary

Problems solved by technology

However, due to the characteristics of small output displacement and hysteresis nonlinearity of smart materials, and the existing actuators can only move in one direction, it is impossible to achieve reversing, the output power of the actuator is low, and the output flow is small. Therefore, In the research of intelligent material-driven actuators, a rectifier valve is needed to convert the high-frequency oil suction and discharge motion into one-way displacement output, so as to realize the efficient conversion of small displacement of intelligent materials

Of course, there are still some problems, such as two-way control of the actuator, small size and light weight, and improved power-to-weight ratio

Images