中文摘要：

由于电液高频疲劳试验机采用传统的电液伺服阀难以达到较高的激振频率，为了解决这个问题，采用一种特殊结构的2D激振阀来控制液压缸，从而提高电液高频疲劳试验机的激振频率。该2D激振阀具有双运动自由度，控制阀芯旋转可实现激振频率控制，控制阀芯轴向运动可实现激振幅值控制。由于2D激振阀的转阀特性，无法引入一个偏置信号实现对激振中心平衡位置的偏置控制，因此在对称液压缸上并联一个数字伺服阀。通过改变数字伺服阀的开口大小和方向就可以实现激振器振动中心位置的偏置。基于激振频率与激振幅值控制原理设计了一种采用DSP控制的控制器，该控制器能控制电液高频疲劳试验机的激振频率与激振幅值。同时，实验室已有的控制器能控制并联的数字伺服阀开口大小，从而达到偏置控制的目的。基于电液高频疲劳试验机的工作与控制原理搭建实验平台并做实验。结果表明：该电液高频疲劳试验机的控制系统可实现高达2500Hz的激振频率，谐振频率为980Hz，在该频率可进行高频率、大载荷的疲劳实验。

英文摘要：

The traditional electro-hydraulic servo valve can not reach a high draulic high-frequency fatigue test machine. In order to solve this problem, control the hydraulic cylinder. This 2D excitation valve has dual freedom of can be achieved by a controlling spool rotation, and the excitation amplitude axial movement. Since the characteristics of the rotary valve of 2D excitation nal to achieve the equilibrium position, so we parallel with a digital servo excitation frequency in the electro-by- we use a special 2D exciting valve to movement, so the excitation frequency can be achieved by a controlling spool valve,we can not introduce a bias sig- valve on the symmetrical cylinder, by changing the opening size and the opening direction of the digital servo valve to achieve the bias control of vibration the work and control theory of electro-hydraulic high-frequency fatigue test machine, we build an experimental plat- form and do experiments. The results of experiments are：this control system can achieve excitation frequency up to 2500 Hz; the resonant frequency is 980 Hz, which can be used in high-frequency, large load fatigue test.