全部

力学与实践 ›› 2017, Vol. 39 ›› Issue (6): 585-590.doi: 10.6052/1000-0879-17-108

• 应用研究 • 上一篇    下一篇

基于修正模态应变能指标的板结构损伤定位

梁振彬, 董聪, 张华昕   

  1. 清华大学土木工程系, 北京 100084
  • 收稿日期:2017-03-29 修回日期:2017-06-25 出版日期:2017-12-15 发布日期:2017-09-25
  • 作者简介:梁振彬,硕士研究生,主要从事结构损伤识别研究.E-mail:liangzhenbin1992@163.com
  • 基金资助:

    国家电网公司科技项目(GC71-12-001)资助.

THE DAMAGE LOCALIZATION FOR PLATE STRUCTURES BASED ON MODIFIED MODAL STRAIN ENERGY INDEX

LIANG Zhenbin, DONG Cong, ZHANG Huaxin   

  1. Department of Civil Engineering, Tsinghua University, Beijing 100084, China
  • Received:2017-03-29 Revised:2017-06-25 Online:2017-12-15 Published:2017-09-25

摘要:

为解决模态应变能方法识别中产生的"邻近效应"问题,提出基于修正模态应变能指标的板结构损伤定位方法.该方法首先利用邻近测点的应变能变化相对大小计算权重系数,再根据权重系数对测点相应区域的应变能进行重新分配.此外,通过定义的损伤辨识度指标研究噪声对损伤定位结果的影响.为验证本文所提方法的可行性和有效性,以一个四边简支板为数值算例.算例结果表明,本文方法对于点状、块状和带状损伤都可以实现准确定位,且具有良好的抗噪性.

关键词:

损伤定位|板结构|模态应变能|抗噪性

Abstract:

In order to deal with the "vicinity efiect" in the damage localization of plate structures, this paper proposes a method based on the modifled modal strain energy. Firstly, the relative strain change at adjacent points are used to calculate the weight coe-cients, Then the strain energy in the corresponding area is redistributed according to the weight coe-cients. By deflning a damage difierentiation degrees index, the influences of the noise on the damage localization can be evaluated. To verify the feasibility and the efiectiveness of the proposed method, a four edge simply supported plate is used as a numerical example. It is shown that the proposed method can realize an accurate damage localization in dot, block and strip damage cases, with a good anti-noise capability.

Key words:

damage localization|plate structures|modal strain energy|anti-noise capability

中图分类号: 

  • TU311.3