曲面叶片三维工作变形连续扫描激光测试

提出一种曲面叶片三维工作变形连续扫描激光多普勒振动测试方法并应用于某压气机叶片的振动测试。将图像几何变换引入激光连续扫描，发展了一种适合曲面叶片这类非规则几何结构的激光连续扫描路径算法，使连续扫描激光振动测试应用于非矩形区域，并通过实验验证了其准确性。基于此测试方法，提出了曲面叶片三维工作变形的测试方法，研究了三维激光测试坐标分解原理。对某压气机叶片进行了三维激光连续扫描测试，获取了3600Hz内的前9阶模态，与商用三维激光离散点扫描测试模态振型的相关性基本在0.95以上，验证了三维连续扫描激光多普勒振动测试的可行性和准确性。连续扫描激光多普勒测试的效率高、测点密集，对进一步工程应用具有重要意义。 

Curved blade three-dimensional operational deflection shape continuous scanning laser measurement

A continuous scanning laser Doppler vibration measurement method for three-dimensional operational deflection shape of a curved blade was proposed and applied to vibration test of a compressor blade. The image geometric transformation was introduced into the laser continuous scanning measurement, and a laser continuous scanning path algorithm capable of dealing with irregular geometries of curved blades was developed. The continuous scanning laser vibration test was applied to non-rectangular area, and its accuracy was verified by test. Based on this method, the approach for measuring three-dimensional operational deflection shape of curved blades was taken, and the coordinate decomposition principle of three-dimensional laser test was studied. The three-dimensional laser continuous scanning test was performed on a compressor blade and the first nine modes within 3600Hz were obtained. The correlation with the results from the commercial three-dimensional laser discrete scanning modal test was basically above 0.95, demonstrating the feasibility and accuracy of three-dimensional continuous scanning laser Doppler vibration test. The continuous scanning laser Doppler vibration measurement, with advantages of high spatial resolution, efficient and effective test, shows the practical value for further engineering application.