无损检测
無損檢測
무손검측
Nondestructive Testing
2015年
11期
56-59
,共4页
裂纹简支梁%Ritz级数法%固有频率%模态振型
裂紋簡支樑%Ritz級數法%固有頻率%模態振型
렬문간지량%Ritz급수법%고유빈솔%모태진형
Crack simply beam%Ritz-series method%Natural frequency%Modal shape
将基于功率平衡原理的Ritz级数法应用到损伤梁计算中，计算出简支梁损伤前后的固有频率和振型。基于ANSYS有限元对裂纹简支梁进行模态分析，用模态振型和能量密度对裂纹梁的损伤位置做出了精确的识别，并结合 BP 神经网络法对裂纹梁的损伤程度做出了准确的判断。对裂纹简支梁进行试验模态分析，结果表明，裂纹损伤对固有频率和模态振型有一定的敏感性，总体变化趋势也和理论模态分析一致。
將基于功率平衡原理的Ritz級數法應用到損傷樑計算中，計算齣簡支樑損傷前後的固有頻率和振型。基于ANSYS有限元對裂紋簡支樑進行模態分析，用模態振型和能量密度對裂紋樑的損傷位置做齣瞭精確的識彆，併結閤 BP 神經網絡法對裂紋樑的損傷程度做齣瞭準確的判斷。對裂紋簡支樑進行試驗模態分析，結果錶明，裂紋損傷對固有頻率和模態振型有一定的敏感性，總體變化趨勢也和理論模態分析一緻。
장기우공솔평형원리적Ritz급수법응용도손상량계산중，계산출간지량손상전후적고유빈솔화진형。기우ANSYS유한원대렬문간지량진행모태분석，용모태진형화능량밀도대렬문량적손상위치주출료정학적식별，병결합 BP 신경망락법대렬문량적손상정도주출료준학적판단。대렬문간지량진행시험모태분석，결과표명，렬문손상대고유빈솔화모태진형유일정적민감성，총체변화추세야화이론모태분석일치。
In this paper,firstly,Ritz-series method based on principles of power balance will be applied in calculations of crack beam and calculate the natural frequency and mode shapes of crack simply supported beam. Secondly,the ANSYS was used to make modal analysis of crack simply supported beam,and to identify it with methods of modal shape and energy density.The modal shape and energy density were combined with BP neural network method in order to make a precise identification of damage location.Finally,an experimental modal analysis was undertaken with crack simply supported beam,and from the test results it could show that crack damage was sensitive to the natural frequency and modal shape,and the overall trends were consistent with theoretical modal analysis.
