抗电磁干扰压电夹层优化设计

Optimized Design for Piezoelectric Layer of Anti-electromagnetism Interference

利用电磁干扰原理，对应用于航空结构健康监测的压电夹层信号易受到串扰、辐射干扰的情况进行了研究，得到若干耦合影响因子。通过合理设置这些影响因子达到了降低干扰的目的。在此基础上研制了抗电磁干扰压电夹层。实验表明，所设计压电夹层有着很好的抗串扰、辐射干扰能力，能够很好地实现损伤检测：在相同测试条件下，优化后的压电夹层信号串扰量较普通压电夹层下降一个数量级；对固定频率谐波干扰的信噪比提高了3．16倍。

The signal of the piezoelectric layer （PZT layer） used in the structural health monitoring for aircraft structures is easily effeeted by radiation and crosstalk. On the principle of electromagnetic interference, the PZT layer signal is researched and some related coupling parameters are obtained. Based on the research, reasonable parameters to reduce interference were designed and a kind of anti-interference PZT layer is developed. The results of the experiments demonstrate the effectiveness of the anti-interference performance of the designed PZT layer. It can be well used for damage detection. In the same test condition, the magnitude of the crosstalk decreases to 10 percent of the original one and the SNR of a fixed frequency interference is improved by 3.16 times when the optimized piezoelectric layer was used.