基于压电阻抗技术的铝梁损伤定位试验研究

Experimental Research of Damage Localization in Aluminum Beam Based on EMI Technique

为了识别铝梁结构损伤位置,运用压电阻抗技术对铝梁进行了损伤定位试验研究.用精密阻抗分析仪在不同频率段下对无损及自制损伤孔两种情况下的阻抗实部信号进行测量,并用pearson相关系数处理试验数据,通过多次试验找到了阻抗实部相关系数值与压电陶瓷传感器(piezoceramic transducer,PZT)和损伤之间距离近似成线性关系的适测频率段.并在适测频率段内进行铝梁损伤定位试验,损伤孔及裂纹位置的探测值与实际值基本吻合,从而证实了该方法应用于铝梁损伤定位的有效性,可为无损检测的损伤定位提供参考.

Aiming at identifying damage location, this paper experimentally investigated the damage location in aluminum beam based on the electro-mechanical impedance （EMI） technique. [ The real signals of imped- ance of nondestructive and handmade damage hole under different frequencies were measured with precision impedance analyzer, then were processed with Pearson correlation coefficient, many times of experiment found the feasible frequency bands and the approximate linear relationship between the correlation coefficient and the distance from PZT to damage was verified in these feasible frequency bands finally. ] Aluminum beam damage location experiments were carried out accordingly and the detection value of damage hole and crack position coincided well with the actual value. The method applied in aluminum beam damage location was verified to be effective and it can provide reference for nondestructive testing of damage location.