摘要
电液激振器受传统的电液伺服阀频响特性的限制,其激振频率难以提高,采用2D阀替代传统伺服阀组成电液激振器的方案,该激振器通过增加阀芯的旋转速度来提高其激振频率,同时将该电液激振器应用于4轴高频结构试验系统。对试验系统的结构和工作原理进行了分析讨论,包括频率、幅值和相位的控制方法。基于系统的频响仿真分析,提出了4个作动器的同步控制策略,对理论分析进行实验验证。试验结果表明:该电液四轴强度疲劳试验系统能在40 Hz^200 Hz范围内对试验对象进行同步加载试验,其频率、幅值连续可控。
In the proposed scheme of an electrohydraulic vibration exciter,a 2D valve(two-dimensional control valve) was used to replace conventional servo valve to enhance frequency response capability by increasing the rotary speed of the spool of the 2D valve.This electrohydraulic vibration exciter was applied to a 4-axis high-frequency structural testing system.Its structure and working principle including the control method of frequency,amplitude and phase of the testing system were described and discussed.Based on a simulation analysis of the frequency response of the system,the control strategy of the synchronization for the 4 hydraulic actuating cylinders was developed.The measured vibration wave was given to validate the theoretical analysis.It was shown that the vibration of the tested object can be excited synchronously in four-axis with in the adjustable frequency range of 40~200Hz and the frequency,amplitude and phase can be controlled continuously.
出处
《振动与冲击》
EI
CSCD
北大核心
2010年第5期86-90,共5页
Journal of Vibration and Shock
基金
国家自然科学基金资助(50675204)
浙江省自然科学基金资助项目(D1080667)
关键词
高频
疲劳试验
电液伺服
high-frequency
fatigue test
electrohydaulic servo
