Improved spatial filter based damage imaging method on composite structures
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摘要: 为降低Lamb波在复合材料结构中传播时存在的频散现象和各方向传播特性的不一致性给损伤监测带来的困难, 提出一种利用Hilbert变换改进的空间滤波器对复合材料结构损伤进行成像的方法。分析了基于空间滤波器的信号合成成像原理, 在此基础上利用Hilbert变换构造传感器时域响应信号的解析信号参与到信号合成成像过程中。通过对仿真声源的成像实验, 验证了该方法的可行性, 通过对碳纤维复合材料板结构上激励源和损伤的成像实验, 验证了该方法的功能。研究表明该方法能够识别损伤相对于压电传感器阵列的角度位置和损伤散射信号的到达时刻。Abstract: To overcome the problem of frequency dispersion, multi-mode and mode convention of Lamb wave signal propagation on composite structures, a spatial filter based strunctural damage imaging method improved by Hilbert transform was proposed. The principle of signal synthesis and imaging based on spatial filter was analyzed. Based on the principle, Hilbert transform was adopted to construct analytic signals of time domain response signals of sensors to participate in the process of signals synthesis and imaging. Imaging of simulating acoustic source was done to validate the feasibility of this method, and then imaging of excitation source and damage on plate-like structures of carbon fiber composite materials was performed to validate the function of this method. The research shows that this method can recognize the angle of damage and the time-of-arrival of damage scattering signals relative to the piezoelectric transducers array efficiently.
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