Four-axis high-frequency structural strength fatigue test system
he four-axis structural strength and fatigue test system include four electrohydraulic vibration exciters which are divided into two groups, two exciters in each and mounted in horizontal and vertical structural frame respectively. The working frequency of the conventional electrohydraulic vibration exciters is limited to fairly narrow range by the frequency response capability of the servo valve. A scheme of electrohydraulic vibration exciter using a 2D valve (two-dimensional control valve) to control a hydraulic actuator is therefore proposed to enhance frequency response capability. This electrohydraulic vibration exciters include 2D valve cylinder and bias control servo valve. In the 2D valve, the rotary and sliding motions are independently exploited to control the frequency and the magnitude of the vibration respectively. The frequency of the 2D valve controlled vibration exciter is determined by the rotary speed, number of grooves distributed on a spool land and coupled pattern of the grooves number on the spool land and the windows number on the spool sleeve. By adjusting these factors in the 2D valve design, the proposed scheme of vibration exciter is apt to realize highfrequency vibration and to increase the working frequency of multi-axis structural strength and fatigue test system. In this paper, the structure of test system is first described. Then, the principal of the electrohydaulic vibration exciter using 2D valve is discussed, which includes the control method of frequency amplitude and phase. The dynamic characteristics of electrohydraulic four-axis highfrequency structural strength and fatigue test system are briefly discussed. Finally, the measured vibration wave is given to validate the theoretical analysis. It is classified that the vibration of the tested object can be excited synchronously in fouraxis with the frequency 5～200Hz adjustable or excited with in one-axis solely.
High-frequency fatigue test electrohydaulic servo
Wen-ang Jia Jian Ruan Sheng Li Faming Zhu Zheqing Yu Xiang Pei
The MOE Key Laboratory of Mechanical Manufacture and Automation, Zhejiang University of Technology, Hangzhou, China
国际会议
杭州
英文
129-133
2009-04-08（万方平台首次上网日期，不代表论文的发表时间）