微小型物体动态特性的实验研究

Experimental Studies of Dynamic Characteristics of Mini-Small Object

本文从理论上分析了利用散斑场的相关统计特性,非接触地记录振动物体时间域自由响应信息,并根据多点同时采集的时间域信号,利用频率域及时间域系统识别技术,进行动态参数识别.实测了微型悬臂梁的弯曲振动、小型三自由度轴的扭振,识别出的动态特性参数与理论值达到很好的一致.从而说明.这一光测——计算机分析系统为微小型物体的动态特性参数识别提供了一条有效途径.

This paper presents a method of the identification of dynamic parameters which using the correlation properties of laser speckle, non-contactive recording of free response of vibration object, collecting simultaneous the time domain signals at multiple points, and depending the conducted system-identification-technique in the frequency and time domains. The bending vibration of the mini-size cantilever beam and the torsional vibration of the mini-size shaft with 3-degeres of freedom are measured. The dynamic property parameters recognized are in good agreement with theoretical values. This provides an effective way for the identification of dynamic parameters of mini-small object.