CAJ | 학술논문

由结构损伤导致性能退化角度出发，分析拉杆松弛引起的预紧失谐组合转子性能退化特性。利用跨尺度计算方法获得轮盘界面接触刚度并对接触界面等效处理，提出考虑粗糙界面及预紧的组合转子动力学建模方法。在此基础上进行组合转子动力学分析，获得组合转子固有频率随时间变化规律；建立以组合转子频率相对降低量表征其性能退化量的定量评估方法，对退化数据进行处理并描述组合转子退化轨迹，实现拉杆松弛引起的组合转子性能退化定量评估；对初始预紧失谐程度相同的组合转子进行不平衡响应分析，获得预紧失谐组合转子退化特征。结果表明，组合转子性能退化量参数服从指数函数分布，负失谐对组合转子不平衡响应影响较大。
유결구손상도치성능퇴화각도출발，분석랍간송이인기적예긴실해조합전자성능퇴화특성。이용과척도계산방법획득륜반계면접촉강도병대접촉계면등효처리，제출고필조조계면급예긴적조합전자동역학건모방법。재차기출상진행조합전자동역학분석，획득조합전자고유빈솔수시간변화규률；건립이조합전자빈솔상대강저량표정기성능퇴화량적정량평고방법，대퇴화수거진행처리병묘술조합전자퇴화궤적，실현랍간송이인기적조합전자성능퇴화정량평고；대초시예긴실해정도상동적조합전자진행불평형향응분석，획득예긴실해조합전자퇴화특정。결과표명，조합전자성능퇴화량삼수복종지수함수분포，부실해대조합전자불평형향응영향교대。
A combined rotor is the key part of an engine,and it is important to reveal its degradation mechanism and assess the performance degradation degree for making maintenance during operation.Performance degradation characteristics of the combined rotor were discussed,from the perspective of performance degradation caused by structural damage.The dynamic features of the combined rotor were analyzed,considering the rod relaxation and interface contact effect and the changing of natural frequency along with the time was observed.Then,by defining the degradation degree of combined rotor,the degradation path was described through processing the degradation data and the degradation assessment was completed as well.At the end,unbalance responses of combined rotors with the same mistuned degree of preload were investigated and the degradation characteristics of combined rotors were obtained.The results show that:degradation parameters of combined rotors have exponential distribution,and the negative mistuning has great effect on the unbalance response amplitude of combined rotors.