关键词: 伺服阀；频率特性；相关原理；信号处理

Abstract: Test of frequency characteristic of servo valves with mutual correlation principle was studied herein. Due to the asymmetric characteristic of servo valves, the dynamic cylinder would move away from the central position when test was carried out. A PC-based, software signal synthesizing scheme was proposed for frequency characteristic test and dynamic cylinder position control. Details on overall structure of the scheme, test controller design, dynamic cylinder position controller design, and the signal processing unit were also given. An example system was finally introduced and test result of a servo valve was also provided. 

Key words: servo valve, frequency characteristic, mutual correlation principle, signal processing