薄壁圆筒结构工作变形的连续扫描激光测振方法

提出了一种薄壁圆筒结构外表面工作变形(ODS)连续扫描激光多普勒振动测试方法。将旋转平台与电动机控制引入激光连续扫描,发展了一种与激光连续扫描路径相匹配的电动机控制算法,使连续扫描激光振动测试应用于薄壁圆筒结构;对试验件进行了薄壁圆筒结构外表面激光连续扫描测试,获取了500 Hz内的前5阶模态,结果表明:该测试方法与商用激光离散点扫描测试模态振型的相关性在0.96以上,验证了薄壁圆筒连续扫描激光多普勒振动测试的可行性与准确性。连续扫描激光测试的效率高、测点密集,对进一步工程应用具有指导意义和实用价值。

Continuous scanning laser vibration test method for ODS of thin-walled cylindrical structure

A continuous scanning laser Doppler vibration test method for operational deflection shape (ODS) of the thin-walled cylindrical outer surface was proposed and applied to vibration test of a cylinder. The rotating platform and motor control were introduced into the laser continuous scanning, and a motor control algorithm matching the laser continuous scan path was developed. The continuous scanning laser vibration test was applied to cylinder structure. And the cylinder laser continuous scanning test was performed on a cylinder structure and the first five orders mode within 500 Hz were obtained. The correlation with the results from the commercial laser discrete scanning modal test was basically above 0.96, demonstrating the feasibility and accuracy of cylinder laser continuous scanning laser Doppler vibration test. The cylinder continuous scanning laser Doppler vibration test, with advantage of high spatial resolution, efficient and effective test, shows certain guiding significance and practical value for further application in actual structure.