Most of the research work on bearing-rotor systems usually simplifies the supporting bearing as a spring or damp system, and ignores that the resonance responses involve obvious differences when the same rotor system ...Most of the research work on bearing-rotor systems usually simplifies the supporting bearing as a spring or damp system, and ignores that the resonance responses involve obvious differences when the same rotor system is supported by varying types of bearings. Aiming at the resonance responses of coast down running tests of the rotor system, we employed two different bearings in experiments: One is the fluid film journal bearing, and the other is the rolling element bearing. The experimental results obtained with the above bearings are compared. The resonance test Bode plots and orbit shapes of the rotor shaft are established. Also, summarized under resonance are the dynamic characteristics and regularities of the two types of bearing-rotor systems. The natural frequency and resonance mode of the same rotor system will change thoroughly with the type of supporting bearings. The results are helpful for system modeling, security running, dynamic design, the study of dynamic characteristics, and the fault diagnose of bearing-rotor systems.展开更多
针对传统的转子结构裂纹故障识别方法中特征提取困难、无法定量识别裂纹深度及受噪声污染严重的问题,提出了一种基于转子轴心轨迹的转子裂纹深度预测模型。该模型基于奇异值分解和卷积降噪自编码器(singular value decomposition-denois...针对传统的转子结构裂纹故障识别方法中特征提取困难、无法定量识别裂纹深度及受噪声污染严重的问题,提出了一种基于转子轴心轨迹的转子裂纹深度预测模型。该模型基于奇异值分解和卷积降噪自编码器(singular value decomposition-denoising convolutional autoencoder,简称SVD-DCAE),能够有效提取裂纹转子的故障特征并准确预测转子裂纹的扩展阶段。将裂纹转子的轴心轨迹作为模型的输入,分别使用仿真数据和实验数据训练和验证模型,并在仿真数据和实验数据中添加随机噪声模拟不同噪声环境。结果显示:所提出模型能够实现转子裂纹扩展程度的准确预测,在弱噪声环境中(信噪比为10 dB)裂纹深度预测准确率高于98%;具有较强的抗噪声能力和鲁棒性,在强噪声环境中(信噪比为-10 dB)预测准确率达到80%,远高于其他经典的卷积神经网络预测模型。展开更多
基金Supported by National Natural Science Foundation of China (50675066)Key Project of Hunan Provincial Science and Technology Research (05FJ2001)China Post-doctorate Science Foundation (2005038006)
文摘Most of the research work on bearing-rotor systems usually simplifies the supporting bearing as a spring or damp system, and ignores that the resonance responses involve obvious differences when the same rotor system is supported by varying types of bearings. Aiming at the resonance responses of coast down running tests of the rotor system, we employed two different bearings in experiments: One is the fluid film journal bearing, and the other is the rolling element bearing. The experimental results obtained with the above bearings are compared. The resonance test Bode plots and orbit shapes of the rotor shaft are established. Also, summarized under resonance are the dynamic characteristics and regularities of the two types of bearing-rotor systems. The natural frequency and resonance mode of the same rotor system will change thoroughly with the type of supporting bearings. The results are helpful for system modeling, security running, dynamic design, the study of dynamic characteristics, and the fault diagnose of bearing-rotor systems.
