提升框架技术在碳纤维复合材料孔隙率检测中的应用研究  

Analysis of Lifting-Scheme-Based Denoising for Void Content Detection in Carbon Fiber Reinforced Plastics

作　　者：华志恒[1] 周晓军[1] 李凌[1] 

机构地区：[1]浙江大学机械与能源工程学院,杭州310027

出　　处：《传感技术学报》2006年第6期2672-2675,2686,共5页Chinese Journal of Sensors and Actuators

摘　　要：对提升框架的基本理论和基于提升框架的去噪方法进行了研究,分析了五种不同提升框架类型(5/3,2/6,2/10,5/11-C和13/7-T)对碳纤维复合材料的超声信号的去噪效果.结果表明对同一个信号,不同框架类型的去噪效果不同,其中框架13/7-T的平均去噪效果最好,具有最大的信噪比和最小的均方根误差,而同一种框架类型对不同信号的去噪效果则比较一致.比较了去噪前后超声信号的衰减系数与孔隙率之间的关系,结果表明经过提升框架去噪后超声信号的衰减系数与孔隙率之间更加符合抛物线关系,提高了碳纤维复合材料孔隙率检测的准确性.Denoising analysis based on lifting scheme was conducted,and five different lifting schemes such as 5/3, 2/6, 2/10, 5/11-C, and 13/7-T were used to denoise the ultrasonic signals of carbon fiber reinforced plastics samples. The results show that the denoising results of different lifting schemes for the same signal are different, and the lifting scheme 13/7-T has the largest average signal noise ratio and the smallest average root mean square error. It is also shown that the denoising results of different signals for a same lifting scheme are similar. The relationship between ultrasonic attenuation and void content was compared for original signals and denoised signals, and the relationship for denoised signals turned out to be closer to parabola relationship.

关 键 词：孔隙率 提升框架 碳纤维复合材料 超声衰减 

分 类 号：V258[一般工业技术—材料科学与工程] TB332[航空宇航科学与技术—航空宇航制造工程]