论文部分内容阅读
在研究机床主轴系统动态性能时,必须知道轴承的支承参数,即,径向刚度K、径向阻尼C_r、角刚度K_c和角阻尼C_a,见图(1)。目前这些参数值,往往是通过试验确定。在结构分析中,刚度值可以通过静态或动态试验来测定,但阻尼系数的识别只能用动态方法测定,所以一般采用动态试验同时测定刚度和阻尼。在被测系统上施以单频的正弦扫频激振或是宽频的瞬态的随机激振,测出系统在激振力F的响应,根据参数识别的基本理论,就可求出系统的各参数。笔者在对某型机床主轴特性进行研究时,为了建立可供电算的主轴系统力学模型,采用一些
When studying the dynamic performance of the spindle system of a machine tool, it is necessary to know the bearing parameters of the bearing, ie, the radial stiffness K, radial damping C_r, angular stiffness K_c and angular damping C_a. The current values of these parameters are often determined experimentally. In the structural analysis, the stiffness value can be measured by static or dynamic test, but the damping coefficient can only be determined by dynamic method. Therefore, the dynamic test is usually used to determine the stiffness and damping simultaneously. In the system under test applied single-frequency sine sweep excitation or wide-band transient random excitation, the system measured in the excitation force F response, according to the basic theory of parameter identification, we can find the system Each parameter. In the study of the characteristics of a machine tool spindle, in order to establish a mechanical model of the spindle system available for calculation, using some