摘要
声发射检测技术对大型构件进行在线监测、检测时会产生大量的数据,这对检测系统的数据传输和存储性能提出了更高的要求。为了解决这一问题,基于压缩感知理论原理,选取不同的压缩采样率对声发射仿真信号和断铅实验信号进行了压缩重构,并对重构的结果进行了对比分析。结果表明:压缩采样率是影响重构效率的重要因素,随着压缩采样率的增加,重构信号的精度也随之增加,但重构时间也会相应变长。综合考虑信号的时频特征、重构误差和重构时间等参数,当压缩采样率不小于25%时,即可满足声发射信号分析要求。
When the acoustic emission detection technology is carried out on-line monitoring and detecting for the large compo- nent, the system will produce a large amount of data, which ask for a higher requirement for the function that data transmission and storage performance of the detection system, in order to solve this problem, based on the compressed sensing theory, choose different compression sampling rate for the acoustic emission simulation signal and the signal of the pencil broken were recon- structed, analyzed the results of reconstruction. Results show that compression sampling rate is the important factor influencing the efficiency of reconstruction, with the increase of compression sampling rate, the precision of the reconstructed signal will in- crease too, but the need of time will be longer. By considering different parameters, such as time-frequency characteristics of the signal, the efficiency of reconstruction, time of reconstruction and so on. It can meet the requirement of the acoustic emission sig- nal analysis when the compression sampling rate is not less than 25%.
出处
《中国科技论文》
CAS
北大核心
2015年第23期2779-2782,2799,共5页
China Sciencepaper
基金
国家自然科学基金资助项目(51207105
51307043)
高等学校博士学科点专项科研基金资助项目(2012131720002)
河北省高校优秀青年基金资助项目(Y2012006)
关键词
压缩感知理论
声发射
压缩重构
压缩采样率
compressive sensing theory
acoustic emission
compressed reconstruction
compression sampling rate
