文章摘要
赵国文.高阶谱应用中应力波波速的估计[J].声学技术,2008,(5):696~699
高阶谱应用中应力波波速的估计
Evaluating stress wave speed by higher order spectrum
投稿时间:2007-12-17  修订日期:2008-02-22
DOI:
中文关键词: 高阶谱  延时估计  混凝土  波速
英文关键词: higher order spectrum  time delay  concrete  wave speed
基金项目:国家自然科学基金项目(50275109);交通部“通达计划”资助项目(95-06-02-04)
作者单位E-mail
赵国文 集美大学轮机工程学院, 福建, 厦门, 361021 gwzhao@jmu.edu.cn 
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中文摘要:
      在应用冲击波法进行无损估计时,应力波波速测量是一项非常重要的工作。研究了基于高阶谱的时间延迟估计原理及其算法,并将其应用到基于冲击波法的双传感器测量应力波波速方法中,解决了传统的直接观察法中的人为误差的影响和噪声对测量精度的影响,降低了测量误差,波速数据具有更好的一致性,取得了满意的实验结果。
英文摘要:
      Measurement of wave speed is very important when impact method is applied to non-destructive testing of concrete structure.Time delay estimation algorithm and theory based on higher order spectrum function are studied.This algorithm has been applied to wave speed evaluation in the case where the wave speed of concrete structures is measured by two transducers.The influences of observation error and noise are eliminated when the higher order spectrum based time delay evaluation is used.Measurement errors are reduced and wave speed data are more consistent.Experiment results are satisfied.
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