结构工程师
結構工程師
결구공정사
STRUCTURAL ENGINEERS
2014年
4期
32-40
,共9页
傅里叶变换%传递率函数%损伤识别
傅裏葉變換%傳遞率函數%損傷識彆
부리협변환%전체솔함수%손상식별
fourier transform%transmissibility function%damage identification
基于动力特性的结构损伤识别方法通常需要已知激励信息,而激励信息一般难以准确测得。为此,直接对加速度响应进行傅里叶变换并计算相邻两点的传递率函数,利用传递率函数构造相应的损伤指标,通过该指标来识别结构的损伤位置,这种方法不需要已知激励信息,不需要进行模态分析。海洋平台结构的数值模拟和振动台试验表明,该方法是可行的,且具有一定的抗噪声能力。
基于動力特性的結構損傷識彆方法通常需要已知激勵信息,而激勵信息一般難以準確測得。為此,直接對加速度響應進行傅裏葉變換併計算相鄰兩點的傳遞率函數,利用傳遞率函數構造相應的損傷指標,通過該指標來識彆結構的損傷位置,這種方法不需要已知激勵信息,不需要進行模態分析。海洋平檯結構的數值模擬和振動檯試驗錶明,該方法是可行的,且具有一定的抗譟聲能力。
기우동력특성적결구손상식별방법통상수요이지격려신식,이격려신식일반난이준학측득。위차,직접대가속도향응진행부리협변환병계산상린량점적전체솔함수,이용전체솔함수구조상응적손상지표,통과해지표래식별결구적손상위치,저충방법불수요이지격려신식,불수요진행모태분석。해양평태결구적수치모의화진동태시험표명,해방법시가행적,차구유일정적항조성능력。
The excitation information is usually needed as the structure damage identification methods based on the structural dynamic characteristic are used.However,the excitation information cannot be measured ac-curately.So,in this paper,the acceleration transmissibility functions of the two adjacent points were calcu-lated through the Fourier transform and a new damage index was constructed with the transmissibility func-tion.The damage location of the structure can be identified with this new damage index.This method re-quires neither the excitation information nor the modal analysis.The numerical simulation of an offshore plat-form structure and the shaking table test showed that the proposed method is feasible and has a certain robust feature.