河海大学学报（自然科学版）
河海大學學報（自然科學版）
하해대학학보（자연과학판）
JOURNAL OF HOHAI UNIVERSITY (NATURAL SCIENCES)
2014年
5期
444-450
,共7页
损伤识别%模态应变能%应变能变化率%应变能耗散率%应变能基指标
損傷識彆%模態應變能%應變能變化率%應變能耗散率%應變能基指標
손상식별%모태응변능%응변능변화솔%응변능모산솔%응변능기지표
damage identification%modal strain energy%strain energy change rate%strain energy dissipation rate%strain energy based index
为解决工程结构的多损伤识别问题，对基于模态应变能的不同损伤指标方法进行了对比分析和研究。首先，描述了3种损伤指标，即模态应变能变化指标( MSECI)、模态应变能耗散率指标( MSECRI)和模态应变能基指标( MSEBI)；然后借鉴模态应变能耗散率指标的建立原理，通过对刚度矩阵的修正，建立相应的能量等效方程，并提取了一种模态应变能等效指标( MSEEI )；最后对4种应变能损伤指标进行了对比研究，并考虑了测量噪声的影响。数值仿真结果表明，模态应变能基指标可以较好地识别结构的损伤位置，模态应变能等效指标则不仅可以有效地识别结构的损伤位置，而且可以较为精确地识别结构的损伤程度。
為解決工程結構的多損傷識彆問題，對基于模態應變能的不同損傷指標方法進行瞭對比分析和研究。首先，描述瞭3種損傷指標，即模態應變能變化指標( MSECI)、模態應變能耗散率指標( MSECRI)和模態應變能基指標( MSEBI)；然後藉鑒模態應變能耗散率指標的建立原理，通過對剛度矩陣的脩正，建立相應的能量等效方程，併提取瞭一種模態應變能等效指標( MSEEI )；最後對4種應變能損傷指標進行瞭對比研究，併攷慮瞭測量譟聲的影響。數值倣真結果錶明，模態應變能基指標可以較好地識彆結構的損傷位置，模態應變能等效指標則不僅可以有效地識彆結構的損傷位置，而且可以較為精確地識彆結構的損傷程度。
위해결공정결구적다손상식별문제，대기우모태응변능적불동손상지표방법진행료대비분석화연구。수선，묘술료3충손상지표，즉모태응변능변화지표( MSECI)、모태응변능모산솔지표( MSECRI)화모태응변능기지표( MSEBI)；연후차감모태응변능모산솔지표적건립원리，통과대강도구진적수정，건립상응적능량등효방정，병제취료일충모태응변능등효지표( MSEEI )；최후대4충응변능손상지표진행료대비연구，병고필료측량조성적영향。수치방진결과표명，모태응변능기지표가이교호지식별결구적손상위치，모태응변능등효지표칙불부가이유효지식별결구적손상위치，이차가이교위정학지식별결구적손상정도。
In order to solve the problem of structural multi-damage identification, different modal strain energy damage index methods are studied and compared. First, three kinds of modal strain energy damage indices, the modal strain energy change index, the modal strain energy dissipation ratio index, and the modal strain energy based index, are described. Then, with consideration of the modal strain energy dissipation ratio index method, an improved equivalence equation is derived through improvement of the stiffness matrix, and a modal strain energy equivalence index is proposed. Finally, four kinds of modal strain energy damage indices are compared, and the impact of the measured noise is considered. Simulation results show that the modal strain energy-based index method can identify structural damage locations, and the proposed modal strain energy equivalence index can not only identify structural damage locations but can identify the damage extent with high accuracy.
