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Kinematic characteristics and fault feature frequency of flexible thin-wall ellipse bearing

机译：柔性薄壁椭圆轴承的运动特性和故障特征频率

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摘要

Flexible thin-wall ellipse bearing (FTEB) is a new type of bearing with completely different kinematic characteristics and fault feature frequencies from ordinary rolling bearing. It is found that the trajectory of the roller center of FTEB is not consistent with the pitch ellipse, while that of ordinary rolling bearing is the pitch circle. The motion trajectory of the roller relative to the pitch ellipse and the cage is further studied. A velocity distribution model of FTEB is proposed, it is proved that FTEB has radial velocity. The radial velocity and acceleration of FTEB are time-varying, and their frequency is twice that of the shaft, while ordinary bearing has no radial velocity and acceleration. Based on the velocity model, the fault feature frequencies of FTEB are derived, which are not fixed values but fluctuating, and the fault feature frequencies of ordinary bearing are only the special cases of FTEB. The vibration of the FTEBs with damaged outer and inner rings is detected, and the results show that there are periodic impacts caused by the rotation of the long and short axes of ellipse in the vibration of FTEB. Finally, the fault impulse feature of the damaged outer and inner rings is extracted, which verifies the theoretical result of the fault feature frequencies of FTEB.
机译：柔性薄壁椭圆轴承（FTEB）是一种新型轴承，具有完全不同的运动特性和来自普通滚动轴承的故障特征频率。结果发现，FTEB的滚子中心的轨迹与间距椭圆形不一致，而普通滚动轴承的轨道是俯仰圆圈。进一步研究了辊子相对于间距椭圆和笼的运动轨迹。提出了FTEB的速度分布模型，证明了FTEB具有径向速度。 FTEB的径向速度和加速度是时变的，并且它们的频率是轴的两倍，而普通轴承没有径向速度和加速度。基于速度模型，导出FTEB的故障特征频率，这不是固定值但波动，普通轴承的故障特征频率仅是FTEB的特殊情况。检测到外圈和内圈损坏的FTEB的振动，结果表明，在FTEB的振动中椭圆的长短轴的旋转引起的周期性冲击。最后，提取了损坏的外圈和内圈的故障脉冲特征，其验证了FTEB故障特征频率的理论结果。

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