基于定向自适应核分布的滑动轴承油膜失稳信号分析  

Method for analysis of instable journal bearing signal based on directional adaptive optimal kernel distribution

作　　者：刘小峰[1] 罗宏林 罗义林 

机构地区：[1]重庆大学机械传动国家重点实验室,重庆400044

出　　处：《振动与冲击》2016年第10期151-156,共6页Journal of Vibration and Shock

基　　金：国家自然科学基金资助项目(51475052);中央高校基本科研业务费(CDJZR14110004);中国博士后基金(2015M582519)

摘　　要：在定向Wigner分布的基础上,提出了定向自适应核时频分布。该方法将用于单通道实信号分析的自适应核分布扩展到复信号,并定义了正交双通道融合复信号的定向自适应核分布。为了验证该方法,利用转子试验台模拟滑动轴承旋转机械的失稳故障以获取数据,分析结果表明该方法不仅能够提取系统在某一截面的周期性振动特征,而且能够揭示转子在指定运动状态时的旋向。与单通道信号的自适应核分布相比,正交双通道融合复信号的定向自适应核分布能更好地抑制交叉项以及具有更高的频率分辨率,此外定向自适应核时频分布与全谱分析结果相吻合,从而验证了该方法的有效性。The directional adaptive optimal kernel distribution was defined based on the directional Wigner distribution.The method extends the adaptive optimal kernel distribution,which is restricted to analyze the real-valued signal,to process the constructed complex-valued signal obtained from the journal bearing supported rotor system operating in the condition of oil film instability.To verify the method,a rotation test bench was built to simulate rotating machinery faults.The analysis of the experimental data shows that the periodic vibration characteristics and the rotation direction within the plane of interest can be easily discovered.Besides,the results of the directional adaptive optimal kernel distribution method keep consistent with those by the full spectrum scheme,which verifies the effectiveness of the method.

关 键 词：滑动轴承 油膜失稳 定向Wigner分布 定向自适应核分布 

分 类 号：TH17[机械工程—机械制造及自动化] TP206[自动化与计算机技术—检测技术与自动化装置]