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本文对流固耦合动态测试进行了深入地探讨,较好地解决了当前类似实验中较为困难的水下激振、拾振等问题。利用压电晶体片激振和拾振集于一身的特点,对结构进行了多点激振与拾振,一方面避免了测试中单点激振和拾振常出现的部分模态遗漏,另一方面对不同工况下各点间的相位进行测试,以期确定水上和水下同阶模态。本文对悬臂矩形板和循环对称结构进行了测试,结果表明,所设计的实验具有性能稳定、信噪比高、测试频带宽等优点。
In this paper, the fluid-solid coupling dynamic test is discussed in depth, which can solve the difficult problems of underwater excitation and vibration pick-up in current similar experiments. Piezoelectric crystal chip vibration and pick up set in one of the characteristics of the structure of the multi-point excitation and pick and shake, on the one hand to avoid the test single-point excitation and pick-up often appear part of the modal omission, and the other On the one hand, the phase between different points under different conditions to test, with a view to determine the same water and underwater modal. In this paper, the cantilever rectangular plate and the circular symmetrical structure were tested. The results show that the designed experiment has the advantages of stable performance, high signal-noise ratio and wide test frequency band.