基于全包络权重算法的超声波法残余应力无损测量系统

基金项目: 国家863高技术研究发展计划资助项目(2006AA09Z314)

Establish of ultrasonic residual stress measurement system based on entire envelope weighting algorithm

1.
College of Mechanical and Electronic Engineering, China University of Petroleum, Dongying 257061, Shandong, China;Drilling Technology Research Institute, Shengli Petroleum Administration Bureau, Dongying 257017, Shandong, China
2.
School of Electrical Engineering and Automatic, Harbin Institute of Technology, Harbin 150001, China
3.
Drilling Technology Research Institute, Shengli Petroleum Administration Bureau, Dongying 257017, Shandong, China

摘要: 基于声弹性效应超声波可以无损检测出结构内部应力,克服了传统应力测量方法费时耗力破坏体积庞大等缺点.针对超声波法测量精度的若干影响因素,为了更准确的表达焊接残余应力场,提出了全包络权重算法,并使用虚拟仪器软件实现.结果表明,该方法使测量的误差大大减小,实现了焊接残余应力超声波法的高精度测量.使用不确定度对开发的高精度超声波法测量系统的测量精度进行了表征.
- 超声波法 /
- 焊接残余应力 /
- 全包络权重法
Abstract: The entire envelope weighting algorithm is proposed in this paper and realized by virtual instrument to obtain residual stress by ultrasonic measurement. Different weight of reference point is assigned to measure time of echo signal more accurately. Compared with traditional single threshold method, the experiment results show that the algorithm improved the stabilization of repeat measurement at the same point by different conditions. The uncertainty is calculated to validate the accuracy of the ultrasonic measurement.
- ultrasonic measurement /
- welding residual stress /
- weighting algorithm