摘要
基于简单铰链裂纹模型和局部柔度理论 ,建立了横向裂纹转子系统扭转振动的动力学模型 ,得到了裂纹转子扭转振动的数值仿真解 ,并证明了呼吸裂纹转子系统存在着亚谐波共振特性 ;将小波技术引入到裂纹转子扭转振动时频特性的数值仿真研究中 ,结果发现裂纹转子的小波时频二维谱存在着 6组大系数 ,小波三维谱表现为 6个峰 ,相应的小波时频等高线表现为 6组同心圆 。
Based on the simple hinge crack model and the local flexibility theorem, the dynamic equation of torsional vibration of cracked rotor system was modelled. The numerical simulation solutions were obtained and the subharmonic resonance of breathing crack was verified. The wavelet technique was introduced into the researches on time-frequency property of torsional vibration of cracked rotor system, which showed that the wavelet two-dimensional spectrum has six group large coefficients; the wavelet three-dimensional spectrum has six peaks; the wavelet contour has six group circles. The results express that the unique time-frequency property of torsional vibration can be used as the criterion for detecting cracked rotor.
出处
《上海交通大学学报》
EI
CAS
CSCD
北大核心
2002年第6期870-872,883,共4页
Journal of Shanghai Jiaotong University
基金
国家重点基础研究规则 (973 )项目 (G19980 2 0 3 2 1)
国家自然科学基金资助项目 (10 1760 14 )
振动
冲击
噪声国家重点实验室开放基金资助项目 (VSN-2 0 0 2 -0 3 )
