基于声发射技术的立柱试验过程安全性研究

Safety Research on Prop Testing Process Based on Acoustic Emission Technology

液压立柱在接受型式检验时,存在因质量不过关而引发的爆缸、液压喷射等现象,给国家财产和现场检验人员人身安全带来极大威胁。为提高安全性,需对立柱试验过程进行监控,及早发现爆缸或液压喷射等迹象,特引入声发射技术对被试的立柱进行监测。声发射技术对立柱在受压过程中产生的裂纹弹性波进行捕捉、分析、处理和显示,并用时差定位方法和小波包技术对声发射信号进行处理以进一步提高定位精度。研究结果表明:该技术可以实时展现立柱缸体内部声发射源信息,帮助检验人员及时发现裂纹的产生,从而避免立柱钢筒爆裂现象发生、提高试验安全。

The burst and hydraulic jet of prop in compulsory inspection due to its inferior quality are great threats to the national property and testing personnel.In order to improve the safety of prop testing,this paper uses the acoustic emission technology to monitor the inspection and find out the clues of burst and hydraulic jet.Firstly,the acoustic emission technology,used to catch,analyze,process,and display the crackle produced in pressing state of prop,is introduced.Then TDOA method and wavelet package technology are used in signal processing,which can further improve the accuracy of locating.The study results show that acoustic emission technology can give a timely show of the acoustic emission sources inside prop and help testing personnel to find crackles early,avoiding the burst phenomenon and thereby improving safety factor.