摘要
基于局部柔度理论和铰链裂纹模型 ,建立了裂纹转子的动力学模型 ,得到了裂纹转子与无裂纹转子的数值仿真解 .利用连续小波时频分析方法 ,讨论了裂纹转子与无裂纹转子的小波时频特性 ,提出了利用小波时频分析方法识别裂纹的新方法 ;数值仿真研究了采样频率对小波时频分析方法的准确性和有效性的影响 ,并给出了建议性的采样频率 .
The dynamic equation of cracked rotor was modelled, which is based on the local flexibility theorem and the hinge crack model; the numerical simulation solutions were obtained from the model. The wavelet time frequency properties of the uncracked rotor and the cracked rotor were discussed by the continuous wavelet time frequency analysis algorithm. A new algorithm using the wavelet time frequency analysis algorithm to detect the crack was proposed. The influence of the sampling frequency on the wavelet time frequency analysis algorithm was analyzed through the numerical simulation research; the valid sampling frequency was presented. The experiments prove the validity and availability of the algorithm in fault daignosis of the cracked rotor.
出处
《上海交通大学学报》
EI
CAS
CSCD
北大核心
2002年第6期865-869,共5页
Journal of Shanghai Jiaotong University
基金
国家重点基础研究规划 (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 )
