中文摘要：

电液激振器作为疲劳试验机的关键部件,其发展趋势是保证输出大激振力的同时,向着2000Hz以上工作频率段的方向发展,以适应新产品开发过程中的振动环境试验的需求,为此对高频电液激振器的研究显得尤为重要。高频电液激振器系统是由2D阀驱动液压缸活塞以某一振动中心位置作周期性往复运动。根据流体力学和系统动力学的理论对该系统进行数学建模。通过实验研究与分析发现,在2000Hz至3000Hz高频电液激振器所采集的激振波形比较光滑,且波形失真度不大,趋近于正弦波。同时,实现了激振频率3000Hz的重大突破。

英文摘要：

The electro-hydraulic Vibration Exciter is a key component of the fatigue testing machine, then its＇ devel- opment trend is to guarantee the output of large exciting force, at the same time, to gain the operating frequency above 2 000 Hz, and to adapt to the needs of the vibration test in the new product development process. So it is par- ticularly important to study high-frequency electro-hydraulic Vibration Exciter. The system of High-frequency elec- tro-hydraulic Vibration Exciter is that hydraulic cylinder piston driven by the 2D valve to a central location for peri- odic vibration of reciprocating motion. According to the theory of fluid mechanics and system dynamics, the mathe- matical model of this system is established. Through experimental research and analysis, the excited waveform col- lected by High-frequency Electro-hydraulic Vibration Exciter from 2 000 Hz to 3 000 Hz is relatively smooth, and its distortion is not obvious, even close to sine wave. Simultaneously, achieving a major breakthrough, the excited frequency is higher than 3 000 Hz.