Teager能量算子(Teager Energy Operator,简称TEO)可通过计算信号能量的方式凸显信号中的瞬态信息,在轴承故障诊断中的应用极为广泛。然而,TEO处理低信噪比信号时,其性能明显下降。针对该问题,提出引入多分辨率参数,用于机车轴承微弱故...Teager能量算子(Teager Energy Operator,简称TEO)可通过计算信号能量的方式凸显信号中的瞬态信息,在轴承故障诊断中的应用极为广泛。然而,TEO处理低信噪比信号时,其性能明显下降。针对该问题,提出引入多分辨率参数,用于机车轴承微弱故障特征提取。设置多分辨率参数m构造多分辨率Teager能量算子(Multiresolution Teager Energy Operator,简称MTEO);利用MTEO计算信号总能量获得信号能量谱,从信号能量的角度消除噪声、增强故障信息;对能量谱包络谱分析获得诊断结果。仿真数据、实验室数据和工程数据验证了该方法的有效性,通过与TEO方案对比,表明MTEO方法能够改善TEO的应用效果,提升轴承微弱故障识别率。展开更多
The parabolic Radon transform has been widely used in multiple attenuation. To further improve the accuracy and efficiency of the Radon transform, we developed the 2- fdomain high-resolution Radon transform based on t...The parabolic Radon transform has been widely used in multiple attenuation. To further improve the accuracy and efficiency of the Radon transform, we developed the 2- fdomain high-resolution Radon transform based on the fast and modified parabolic Radon transform presented by Abbad. The introduction of a new variable 2 makes the transform operator frequency-independent. Thus, we need to calculate the transform operator and its inverse operator only once, which greatly improves the computational efficiency. Besides, because the primaries and multiples are distributed on straight lines with different slopes in the 2-fdomain, we can easily choose the filtering operator to suppress the multiples. At the same time, the proposed method offers the advantage of high-resolution Radon transform, which can greatly improve the precision of attenuating the multiples. Numerical experiments suggest that the multiples are well suppressed and the amplitude versus offset characteristics of the primaries are well maintained. Real data processing results further verify the effectiveness and feasibility of the method.展开更多
文摘Teager能量算子(Teager Energy Operator,简称TEO)可通过计算信号能量的方式凸显信号中的瞬态信息,在轴承故障诊断中的应用极为广泛。然而,TEO处理低信噪比信号时,其性能明显下降。针对该问题,提出引入多分辨率参数,用于机车轴承微弱故障特征提取。设置多分辨率参数m构造多分辨率Teager能量算子(Multiresolution Teager Energy Operator,简称MTEO);利用MTEO计算信号总能量获得信号能量谱,从信号能量的角度消除噪声、增强故障信息;对能量谱包络谱分析获得诊断结果。仿真数据、实验室数据和工程数据验证了该方法的有效性,通过与TEO方案对比,表明MTEO方法能够改善TEO的应用效果,提升轴承微弱故障识别率。
基金sponsored by the National 973 Program(No.2011CB202402)the National Natural Science Foundation of China(No.41104069)the Fundamental Research Funds for the Central Universities(No.14CX06017A)
文摘The parabolic Radon transform has been widely used in multiple attenuation. To further improve the accuracy and efficiency of the Radon transform, we developed the 2- fdomain high-resolution Radon transform based on the fast and modified parabolic Radon transform presented by Abbad. The introduction of a new variable 2 makes the transform operator frequency-independent. Thus, we need to calculate the transform operator and its inverse operator only once, which greatly improves the computational efficiency. Besides, because the primaries and multiples are distributed on straight lines with different slopes in the 2-fdomain, we can easily choose the filtering operator to suppress the multiples. At the same time, the proposed method offers the advantage of high-resolution Radon transform, which can greatly improve the precision of attenuating the multiples. Numerical experiments suggest that the multiples are well suppressed and the amplitude versus offset characteristics of the primaries are well maintained. Real data processing results further verify the effectiveness and feasibility of the method.
