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为了解基于压电阻抗方法识别管道裂纹损伤程度的可行性,通过人工切割方法模拟管道裂纹损伤,采用压电阻抗方法对管道裂纹损伤进行监测试验。实测各种损伤工况下压电片的阻抗信号,分析试验数据,提取均方根差(RMSD)作为损伤指标。基于RMSD损伤指标与损伤面积的变化规律,建立了管道损伤程度量化表征的数学模型。试验结果表明:当管道出现裂纹损伤后,PZT阻抗频谱曲线明显向左偏移,峰值对应频率下降;随着管道裂纹损伤程度不断加大,RMSD值逐渐增长,RMSD损伤指标能定性地判断管道损伤状况。所建立的数学模型在一定程度上实现了管道裂纹损伤的定量分析。
In order to understand the feasibility of identifying the degree of pipeline crack damage based on the piezoelectric impedance method, the pipeline crack damage is simulated by manual cutting method and the pipeline crack damage monitoring test is conducted by the method of piezoelectric impedance. Measured under various damage conditions piezoresistive impedance signal, analysis of experimental data, root mean square error (RMSD) as damage indicators. Based on the change rule of RMSD damage index and damage area, a mathematical model of quantification of pipeline damage degree was established. The experimental results show that the impedance spectral curve of PZT shifts to the left and the peak frequency decreases when the pipe is cracked. The RMSD value increases with the increase of the crack degree in the pipeline, and the RMSD damage index can qualitatively determine the pipeline damage situation. The mathematical model established to a certain extent, to achieve a quantitative analysis of the pipeline crack damage.