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Measurement of real normal modes with adapted resolution by means of a continuously scanning laser vibrometer

机译：通过连续扫描激光测振仪以合适的分辨率测量真实的正常模式

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This article presents a method of measuring mode shapes for a sinusoidally excited structure using a continuously scanning laser Doppler vibrometer (LDV). The LDV output signal is an amplitude-modulated vibration in which the excitation signal is modulated by the complex deflection of the excited structure. The mode shape can be derived along a scan path by the envelope of the modulated vibration using an applicable demodulation. For an optimised identification of the tuned mode shape, it is possible to adapt the scan path to the characteristics of the selected mode shape. Therefore, the laser beam is driven with varying instead of constant scan frequencies over the surface of the test object during one scan. An algorithm is presented to derive an applicable function for the mirror drive signals from the measured deflection along the scan path. The algorithm calculates the gradient of the measured responses and derives an optimised scan path. Hence the resolution and sampling rate can be adapted to the characteristics of the tuned mode.
机译：本文介绍了一种使用连续扫描激光多普勒振动计（LDV）测量正弦激励结构的模态形状的方法。 LDV输出信号是调幅振动，其中，通过被激结构的复偏而调制激振信号。可以使用适当的解调，通过调制振动的包络线沿扫描路径得出模态形状。为了优化识别调谐模式形状，可以使扫描路径适应所选模式形状的特征。因此，在一次扫描期间，以变化而不是恒定的扫描频率驱动激光束在测试对象的整个表面上。提出了一种算法，该算法可从沿扫描路径测得的偏转中得出镜驱动信号的适用函数。该算法计算所测响应的梯度，并得出优化的扫描路径。因此，分辨率和采样率可以适合于调谐模式的特性。

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