CAJ | 학술논문

针对飞行器弹性梁结构的振动疲劳损伤问题，基于单元模态应变能的变化提出了一种新的结构损伤识别方法。该方法以结构损伤会导致其模态性能变化为原则，通过对比结构单元损伤前后模态应变能的变化率来构建损伤指标。在构建损伤指标之前，假定弹性梁的刚度是由单元刚度组成的，在定义单元刚度灵敏度公式的基础上，建立了弹性梁损伤前后模态应变能变化的联系。最后采用数值计算和实验测试方法，得到了弹性梁损伤状态的识别结果，验证了该方法对损伤识别的正确性和有效性。
침대비행기탄성량결구적진동피로손상문제，기우단원모태응변능적변화제출료일충신적결구손상식별방법。해방법이결구손상회도치기모태성능변화위원칙，통과대비결구단원손상전후모태응변능적변화솔래구건손상지표。재구건손상지표지전，가정탄성량적강도시유단원강도조성적，재정의단원강도령민도공식적기출상，건립료탄성량손상전후모태응변능변화적련계。최후채용수치계산화실험측시방법，득도료탄성량손상상태적식별결과，험증료해방법대손상식별적정학성화유효성。
usedBased on the problems of vibration fatigue damage in an elastic beam which was widelymodailnsatriarcinraeftnse,a novel method was proposed for structural damage detection via change of the unitrgy .A principle was employed that the modal properties will be changing as the struc-atunreelawsatiscdbaemamagewda.An indicator was built through comparing the modal strain energy before and afters injured .Firstly ,an elastic beam’s stiffness was regarded that it was built by unit esltaifsftnicesbse,and a formula was defined for unit stiffness sensitivity .Thereafter ,the contact betweenams before and after damaged was built by modal strain energy .Results are given after sim-ulation and experiments ,the accuracy and efficiency of this method were verified .