不同摩擦状态下滑动轴承与转子碰撞振动提取研究

摘要

为了研究滑动轴承在不同摩擦状态下碰撞振动的特征,在滑动轴承试验台上进行滑动轴承不同摩擦状态试验,应用谐波小波包变换提取滑动轴承碰撞振动信号,探讨碰撞振动信号在滑动轴承同摩擦状态下的变化.结果表明:当滑动轴承处于边界摩擦状态时,碰撞振动信号的均方根值大,并随着主轴转速的增加而增大;当滑动轴承处于混合摩擦状态时,碰撞振动信号的均方根值随着主轴转速的增加显著下降;当滑动轴承处于液体摩擦状态时,碰撞振动信号的均方根值小,并随着主轴转速的增加呈平稳上升趋势.因此,通过谐波小波包变换提取的滑动轴承碰撞振动信号反映了滑动轴承摩擦状态的变化,可用于滑动轴承摩擦状态的监测.%In order to study the collision vibration features of sliding bearing under different friction states,the different friction state tests of sliding bearing were conducted on a shding bearing test bench.The collision vibration signals of sliding bearing were extracted by using the harmonic wavelet packet transform.The variation of collision vibration signals under different friction condition was investigated.Theresults show that when the shding bearing is in the boundary friction,the RMS (Root Mean Square) of collision vibration signals is large and is increased as the spindle speed increases.When the sliding bearing is in the mixed friction,the RMS of collision vibration signals is decreased significantly as the spindle speed increases;when the sliding bearing is in the liquid friction,the RMS of collision vibration signals is small and shows a steady upward trend as the spindle speed increases.Therefore the collision vibration signals extracted by harmonic wavelet packet transformation can reflect and monitor the changes of friction states for sliding bearing.