基于Lamb波的复合材料多损伤定位方法研究

Research on Multi-Damage Location Method of Composite Materials Based on Lamb Wave

针对航空航天用碳纤维增强树脂基复合材料多损伤问题,研究一种损伤方向算法与椭圆轨迹算法相结合的损伤定位方法。首先,根据Lamb波在板中的传播特性,提出一种基于PZT结的损伤方向算法,运用方向算法找到Lamb波在损伤位置发生散射后的若干传播方向,再通过传播方向的交点来实现多损伤位置的初步判定。其次,运用椭圆轨迹算法,实现多损伤位置的进一步判定。最后,在碳纤维增强树脂基复合材料薄板上对该方法进行实验验证,选用希尔伯特黄变换的信号处理技术实现对损伤散射信号到达时间的提取。实验结果表明,该损伤定位方法能够对复合材料多损伤位置进行有效定位。

Aiming at the multiple damage problems of carbon fiber reinforced resin matrix composites for aerospace applications,a damage location method combining damage direction algorithm and elliptical trajectory method was studied.Firstly,according to the propagation characteristics of Lamb wave in the plate,a damage direction algorithm based on PZT junction is proposed.The direction algorithm is used to find several propagation directions of Lamb wave after scattering at the damage location,and the preliminary determination of multiple damage locations is realized through the intersection of the propagation directions.Secondly,the elliptic trajectory algorithm is used to further determine the multiple damage locations.Finally,the method is verified by experiments on carbon fiber reinforced resin matrix composite sheet.The Hilbert yellow transform signal processing technology is used to extract the arrival time of damage scattering signals.The experimental results show that the damage location method can effectively locate multiple damages of composite materials.