基于声场辐射的铝板冲击载荷信号反演

Inversion of Impact Load Signal of Aluminum Plate Based on Sound Field Radiation

在结构健康监测中获取结构响应是非常重要的。基于由载荷引发的结构损伤问题,通过对铝板上的冲击载荷产生的声场进行研究来获取结构响应。通过声模态叠加法模拟出声场模型,运用近场声全息技术反演声场,分析声场信息;然后通过设计反演算法来实现对载荷冲击信号的反演,为结构损伤的分析评估提供一个参考因素;最后,选定激励信号对载荷冲击信号进行模拟,结合声场的正向重建和逆向重建过程,得到反演信号,并与原信号进行对比,验证了该方案的可行性。

It is very important to obtain structural response in structural health monitoring.Based on the structural damage caused by load, the structural response is obtained by studying the sound field generated by the impact load on the aluminum plate.The sound field model is simulated by acoustic mode superposition, the sound field is inverted by using near-field acoustic holography technology, and the sound field information is analyzed.Then the inversion algorithm is designed to realize the inversion of load impact signal, which provides a reference factor for the analysis and evaluation of structural damage.Finally, the excitation signal is selected to simulate the load impact signal.Combined with the forward and reverse reconstruction process of sound field, the inversion signal is obtained, and compared with the original signal to verify the feasibility of this scheme.