노즐-플래퍼 방식 전기유압 서보밸브의 히스테리시스 특성 향상에 관한 연구

Abstract

A Study on the Hysteresis Characteristics for on an Electro-hydraulic Servo Valve Equipped with Nozzle and Flapper Components

Park, Jin-Hyun

Department of Mechanical Engineering, Graduate School of Pukyong National University

ABSTRACT

Recently, a hydraulic system for controlling of position, velocity and force is using in a variety of industry because of higher power and accuracy performance. An electro-hydraulic servo valve is one of structure elements for a servo control system. The knowledge of working mechanism of the servo valve, in the industry, is not clear yet. Thus, studies in detail for the electro-hydraulic servo valve are more needed. This study focuses on evaluation of a hysteresis characteristic of the electro-hydraulic servo valve equipped with a nozzle and flapper components. In simulation of the nozzle and flapper type servo valve, a hysteresis curve for a rated flow and supplied current were obtained by MATLAB Simulink software. A prototype of the electro-hydraulic servo valve was fabricated to evaluate the hysteresis according to materials applied and geometric dimension of a flexure tube. The SUS630 material for the flexure tube showed less hysteresis than the SUS304. A higher stiffness was obtained at a large slenderness of the flexure tube.