中文核心期刊
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中国科技核心期刊
RCCSE中国核心学术期刊
重庆交通大学学报（自然科学版）

重庆交通大学学报（自然科学版） ›› 2021, Vol. 40 ›› Issue (10): 91-96.DOI: 10.3969/j.issn.1674-0696.2021.10.11

• 交通基础设施工程 • 上一篇    

基于波速衰减的混凝土损伤声发射定位优化算法试验研究

何兆益1，杨康2，李冬雪1，周翰林2   

  1. (1. 重庆交通大学 交通运输学院，重庆 400074； 2. 重庆交通大学 土木工程学院，重庆 400074)
  • 收稿日期:2021-06-25 修回日期:2021-09-22 发布日期:2021-10-29
  • 作者简介:何兆益（1965—），男，云南昭通人，教授，主要从事公路路基结构与设计方面的研究。E-mail：hzyzwb@cqjtu.edu.cn 通信作者：杨康（1994—），男，重庆人，博士研究生，主要从事公路结构健康监测方面的研究。E-mail：yangkang0125@163.com 何兆益1，杨康2，李冬雪1，周翰林2
  • 基金资助:
    国家重点研发计划项目（2018YFB1600200）；国家自然科学基金项目（51978116）.

Experimental Study on Optimization Algorithm for Acoustic Emission Location of Concrete Damage Location Based on Wave Velocity

HE Zhaoyi1, YANG Kang2, LI Dongxue2, ZHOU Hanlin2   

  1. (1. School of Traffic & Transportation, Chongqing Jiaotong University, Chongqing 400074, China; 2. School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China)
  • Received:2021-06-25 Revised:2021-09-22 Published:2021-10-29

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摘要： 为研究声波在混凝土内部的衰减规律并提高声发射定位精度，对混凝土梁进行波速衰减试验，计算波速随距离的变化并给出波速随距离的衰减公式，建立基于波速衰减的声发射源定位穷举算法，进行了三点加载模式下的水泥混凝土小梁损伤断裂试验，采用声发射采集仪采集各项声发射参数，利用基于波速衰减的穷举定位算法对加载过程中损伤点进行定位，并与原有恒定波速的损伤点定位算法进行对比。研究结果表明：标准声发射信号波速在混凝土内部随距离增大衰减现象较为严重，初始的基准速度为4 745 m/s，在传播600 mm时已降至2 124 m/s；在脆性破坏阶段，声发射优化算法定位点数量由4个上升至16个，占比由17.4%上升至70.0%，精度较时差定位法明显提高，对混凝土损伤的定位与检测具有重要意义。

关键词: 道路工程；声发射（AE）；波速衰减；穷举法；定位精度

Abstract: In order to study the attenuation law of acoustic wave in concrete and improve the positioning accuracy of acoustic emission, the wave velocity attenuation test of concrete beam was carried out, and the variation of wave velocity changing with distance was calculated, and the attenuation formula of wave velocity with distance was given. An exhaustive algorithm for acoustic emission source location based on wave velocity attenuation was established. The damage and fracture test of cement concrete trabecula under three-point loading mode was carried out, and the acoustic emission acquisition instrument was used to collect the acoustic emission parameters. An exhaustive localization algorithm based on wave velocity attenuation was used to locate the damage points during loading, and compared with the original damage point location algorithm with constant wave velocity. The research results show that the wave velocity of standard acoustic emission signal in concrete is seriously attenuated with the increase of distance. The initial reference velocity is 4745m/s, which has decreased to 2124m/s when the propagation is 600mm. In the brittle failure stage, the number of locating points of acoustic emission optimization algorithm increases from 4 to 16, and the proportion increases from 17.4% to 70%, and its accuracy is significantly higher than that of time difference location method, which is of great significance to the location and detection of concrete damage.

Key words: highway engineering; acoustic emission; wave velocity attenuation; method of exhaustion; location accuracy

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