A Combined Damage Detection Method Based on Modal Strain Energy and Frequencies
A combined damage detection(CDD)method to localize multiple structural damage by use of modal strain energy and frequencies is presented.First,modal strain energy dissipation ratio theory is applied to obtain local identification information and the acquired data is converted into probability values;then,a frequency change damage detection method is introduced to obtain complementary identification information and the acquired data is also converted into probability values.Consider an information system consisting of two information sources,modal strain energy and frequencies.The local decisions are acquired from the probability values which are obtained by using the strain energy dissipation ratio theory and frequency change damage detection method.All the local decisions are sent into a fusion center and an evidence theory is proposed to integrate local decisions.Thus,the global identification information is acquired,which is more accurate than the local information.A truss structure is analyzed as a numerical example to illustrate the performance of the proposed method.The simulation results demonstrate the proposed CDD method can perfectly identify damage sites,and the identification results of the CDD method are better than those of both the modal strain energy dissipation ratio method and frequency change damage detection method.
damage detection modal strain energy frequency evidence theory information fusion
Huiyong Guo Zhengliang Li
School of civil Engineering,Chongqing University,Chongqing 400045,P.R.China
国际会议
The World Forum on Smart Materials and Smart Structures Technology(SMSST07)(2007年世界智能材料与智能结构技术论坛)
重庆·南京
英文
2007-05-01（万方平台首次上网日期，不代表论文的发表时间）