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为了解基于压电阻抗技术识别管道多裂纹损伤的可行性,进行管道多裂纹损伤识别试验。利用机械加工方法模拟裂纹产生和发展过程。实测第1条裂纹和第2条裂纹在各种损伤深度情况下压电陶瓷传感器的阻抗谱曲线,分析各种损伤状态下的曲线特征。根据实验数据计算均方根偏差统计特征指标,分析裂纹损伤程度与统计特征指标之间的规律。结果表明,随着裂纹损伤程度加剧,导纳频谱曲线峰值频率下降,阻抗值减小;基于压电阻抗方法的损伤识别具有很强敏感性,压电片距离损伤位置越近识别效果越好;均方根差特征指标能有效判断钢管裂纹损伤状况。
To understand the feasibility of identifying multi-crack damage in pipes based on piezoresistive technology, a multi-crack damage identification test was carried out. Machining method to simulate crack generation and development process. Measured the impedance spectra of the first ceramic and the second ceramic cracked piezosensor under various depths of damage, and analyzed the curve characteristics under various damage conditions. According to the experimental data, the statistical characteristic indexes of root mean square deviation are calculated, and the regularity between the degree of crack damage and the statistical characteristic index is analyzed. The results show that as the degree of crack damage aggravates, the peak frequency of admittance spectrum decreases and the impedance value decreases. The damage identification based on the piezoelectric impedance method is highly sensitive. The closer the piezoelectric film is to the damage location, the better the recognition effect. Root mean square error can effectively determine the characteristics of steel cracks damage status.