东北大学学报（自然科学版）

东北大学学报(自然科学版) ›› 2013, Vol. 34 ›› Issue (5): 691-693.DOI: -

• 机械工程 • 上一篇    下一篇

基于试验模态分析的钢棒裂纹缺陷损伤性

孙红春，吴绍坤，张大龙   

  1. (东北大学机械工程与自动化学院，辽宁沈阳110819)
  • 收稿日期:2012-12-06 修回日期:2012-12-06 出版日期:2013-05-15 发布日期:2013-07-09
  • 通讯作者: 孙红春
  • 作者简介:孙红春(1974-)，女，辽宁绥中人，东北大学副教授.
  • 基金资助:
    中央高校基本科研业务费专项资金资助项目(N110403012)；国家自然科学基金资助项目(50905030).

Cracks Damage of the Steel Bar Based on Experimental Modal Analysis

SUN Hongchun， WU Shaokun， ZHANG Dalong   

  1. School of Mechanical Engineering ＆ Automation， Northeastern University， Shenyang 110819， China.
  • Received:2012-12-06 Revised:2012-12-06 Online:2013-05-15 Published:2013-07-09
  • Contact: SUN Hongchun
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摘要： 为克服传统无损检测方法检测缺陷成本高、局部化等缺点，采用单输入单输出(SISO)的试验模态分析方法，对直径8mm的不同损伤钢杆进行试验研究.通过对相应动态参数的分析，提取振型应变模态差分曲线为裂纹缺陷直接评价指标.模态分析结果表明，利用此指标能准确地判断实际损伤位置和评估损伤程度，此方法可用于工程结构缺陷的动态无损检测和评估中.

关键词: 钢棒, 试验模态, 损伤识别, 裂纹缺陷, 单输入单输出

Abstract: To overcome the disadvantages of the traditional nondestructive testing methods such as the high cost and localization， a singleinput singleoutput (SISO) experimental modal analysis method was used to analyze the steel bar with the diameter of 8mm in different damage. Strain modal difference curve was served as the evaluation index through the analysis of the corresponding dynamic parameter. The results show that the index can accurately determine the actual damage location and assess the degree of injury. The method can be used for the nondestructive testing and evaluation of the engineering structure defects in the dynamic test.

Key words: steel bar, experimental modal, damage identification, crack defect, singleinput singleoutput

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