| 裂纹转子识别中Wigner-Ville分布与小波变换的比较 |
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| 引用本文： | 邹剑,陈进,董广明. 裂纹转子识别中Wigner-Ville分布与小波变换的比较[J]. 机械强度, 2003, 25(6): 591-595 |
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| 作者姓名： | 邹剑 陈进 董广明 |
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| 作者单位： | 上海交通大学,振动、冲击、噪声国家重点实验室,上海,200030 |
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| 基金项目： | 国家973重点基础研究规划项目(G1998020321)，国家自然科学基金(10176014)，振动、冲击、噪声国家重点实验室开放基金(VSN-2002-03)资助项目~~ |
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| 摘 要： | 建立基于简单铰链裂纹模型的裂纹转子瞬态响应的动力学模型，得到裂纹转子与无裂纹转子的数值仿真解，比较裂纹转子与无裂纹转子Wigner-Ville分布和小波变换时频特性的不同。数值仿真进一步对比研究Wigner-Ville分布和小波变换对刚度变化的敏感性，并讨论质量偏心和质量偏心角对Wigner-Ville时频特性与小波时频特性的影响，为工程实际中裂纹转子的识别提供依据。
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| 关 键 词： | 裂纹 转子 时频特性 Wigner-Vine分布 小波变换 瞬态响应 刚度 敏感性 动力学 |
| 修稿时间： | 2003-02-26 |
COMPARISION WIGNER-VILLE DISTRIBUTION WITH WAVELET TRANSFORM IN IDENTIFICATION OF CRACKED ROTOR |
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| ZOU Jian CHEN Jin DONG Guangming. COMPARISION WIGNER-VILLE DISTRIBUTION WITH WAVELET TRANSFORM IN IDENTIFICATION OF CRACKED ROTOR[J]. Journal of Mechanical Strength, 2003, 25(6): 591-595 |
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| Authors: | ZOU Jian CHEN Jin DONG Guangming |
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| Abstract: | Based on the simple hinge crack model, the dynamic equation of transient response in a cracked rotor is modelled. The numerical simulation solutions of the uncracked rotor and the cracked rotor are obtained from the model. Using Wigner-Ville distribution and Wavelet transform, the time-frequency features of the cracked rotor and the uncracked rotor are compared. By simulation research, the sensitivity of Wigner-Ville distribution and Wavelet transform to the stiffness variation is investigated; and the influence of the unbalance and the inhabiting angle on the time-frequency feature is discussed. The time-frequency feature can be used as the criterion for identification of cracked rotor in engineering practices. |
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| Keywords: | Cracked rotor Time-frequency feature Wigner-Ville distribution Wavelet transform Transient response Stiffness variation Sensitivity |
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