基于激光旋转扫描的约束态薄壁圆柱壳模态振型测试新方法

PDF(1269 KB)

振动与冲击 ›› 2014, Vol. 33 ›› Issue (16) : 155-159.

论文

基于激光旋转扫描的约束态薄壁圆柱壳模态振型测试新方法

李晖1，孙伟1，许卓1，韩清凯2

作者信息 +

A experimental method of laser rotating canning to measure mode shape of constrained thin cylindrical shell

LI Hui1，SUN Wei1，XU Zhuo1，HAN Qing-kai2

Author information +

文章历史 +

摘要

针对传统采用实验模态分析理论辨识模态振型测试效率低的问题，提出基于单点激光旋转扫描的测试约束态圆柱壳模态振型新方法。在明确基本测试原理基础上组建激光旋转扫描测试圆柱壳模态振型实验系统，提出基于激光旋转扫描测试约束态模态振型试验流程，并对判定圆柱壳共振及由响应数据获得圆柱壳模态振型等关键技术进行详述。通过实例验证结果表明，该方法可快速准确获得薄壁圆柱壳的模态振型、极大提高空间测试分辨率、高效测试圆柱壳结构各点振动响应，具有一定工程应用价值。

Abstract

Getting mode shapes of constrained cylindrical shell have important implications for the dynamic design as well as vibration suppression of its structural components. The efficiency of the traditional method using experimental modal analysis theory to identify the mode shapes is much lower, so this paper developed a new experimental method and build a test system of laser rotating canning to measure mode shapes of constrained thin cylindrical shell, which including laser Doppler vibrometer, DC power supply, DC slowdown motors, mirrors, etc. Then, the test procedure was proposed for this test system. And how to determine the resonance of the cylindrical shell and how to obtain mode shapes from response data as well as other key technologies were described in detail. At last, this experimental method has been demonstrated using a study case which shows it can get modal shapes of thin cylindrical shell efficiently and accurately. Moreover, it can greatly improve spatial resolution of measuring points. Thus, it can be used to rapidly measure vibration response of the cylindrical shell structure. This study can provide important references to applications of vibration test of cylindrical shell in engineering field.

导出引用

李晖;孙伟;许卓;韩清凯. 基于激光旋转扫描的约束态薄壁圆柱壳模态振型测试新方法[J]. 振动与冲击, 2014, 33(16): 155-159

LI Hui;SUN Wei;XU Zhuo;HAN Qing-kai. A experimental method of laser rotating canning to measure mode shape of constrained thin cylindrical shell[J]. Journal of Vibration and Shock, 2014, 33(16): 155-159