摘要
声发射技术具有实时动态监测的优点,因此其应用越来越广泛,但采用声发射技术对材料和结构的损伤进行定量评估及寿命预测还没有解决办法。提出采用广义S变换对钢材声发射检测信号进行时频分析,通过分析信号时频特征可达到评价钢材损伤各个阶段的目的。首先通过理论分析和仿真信号处理研究,验证广义S变换具有更高时频分辨率;然后在钢材拉伸实验中建立声发射监测系统,采集钢材拉伸损伤各个力学阶段的声发射信号进行时域和频域特征分析;最后采用广义S变换处理,通过时频处理结果可获得钢材在各个损伤阶段的有明显差异的声发射信号时频特征,可为今后钢材使用过程中的损伤定量和寿命预测提供可靠参考依据。
Acoustic emission technology has the is used more extensively than others. However, and life prediction of So generalized S tran advantages of real-time dynamic monitoring, so it there is still no solution for quantitative evaluation damage to materials and structures based sform was recommended to be adopted to on acoustic emission technology. carry out real-time analysis for acoustic emission detection signal, and the purpose of evaluating the steel damage at different stages higher can be achieved by analyzing the time-frequency characteristics of signal. Firstly, the time-frequency resolution of generalized S transform was verified through theoretical analysis and simulation signal processing research, and established during the steel tensile test, to mechanics stage of steel tensile damage then the acoustic emission monitoring system is collect the acoustic emission signals at each for time-domain and frequency-domain characteristics analysis. Finally, based on generalized S transform processing and time-frequency processing results, AE signal time-frequency characteristics of steel with obvious differences at each damage stage can be obtained, which can provide reliable reference for damage quantitative analysis and service life prediction of steel when using in the future.
出处
《中国测试》
CAS
北大核心
2018年第1期129-135,共7页
China Measurement & Test
基金
国家自然科学基金资助项目(11264032
11374134
11764030)
江西省自然科学基金资助项目(20122BAB201024)
国家质检总局科技计划项目资助项目(2013zjjz180)
航空科学基金资助项目(2014ZD56007)
2016年度江西省质监局科技计划项目资助(11)
关键词
声发射检测
广义S变换
时频分析
损伤特征
AE testing
generalized S transform
time-frequency analysis
damage characteristics
