Degradation stage prediction of rolling bearing based on fuzzy correlation dimension and maximum entropy particle filter
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摘要:
针对使用硬阈值函数计算关联维数导致边界扰动问题,提出模糊关联维数方法,并将其用于提取滚动轴承退化特征。针对滚动轴承退化阶段小样本预测特点以及传统粒子滤波缺乏预测结果的置信区间估计问题,提出最大熵粒子滤波方法。试验研究结果表明:模糊关联维数与滚动轴承振动信号的演变趋势具有一致性,能够准确提取滚动轴承振动性能退化特征。同时,所提最大熵粒子滤波的平均相对误差显仅为1.31%,平均绝对误差仅为6.94,显著低于传统粒子滤波和GM模型,并且增加的区间预测功能使其预测结果更加丰富多样。
Abstract:Considering the problem in calculating the correlation dimension using the hard threshold function that may lead to boundary disturbances, a fuzzy correlation dimension method was proposed and then used to extract the degradation features of rolling bearing. In view of the small sample prediction characteristics for the degradation stage of rolling bearing and the lack of confidence interval estimation for prediction results in traditional particle filtering, the maximum entropy particle filtering method was proposed. The experimental results showed that the fuzzy correlation dimension was consistent with the evolution trend of rolling bearing vibration signals, and can accurately extract the rolling bearing vibration performance degradation feature. Meanwhile, the average relative error of the proposed maximum entropy particle filter was only 1.31%, and the average absolute error was only 6.94, which was significantly lower than traditional particle filters and GM models. The added interval prediction function made the prediction results more diverse.
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表 1 各个振动序列的延迟时间与饱和嵌入维数
Table 1. Delay time and saturation embedding dimension of each vibration sequence
振动序列号 延迟时间t 饱和嵌入维数d0 1 2 28 2 1 30 3 2 20 4 1 24 5 3 26 6 1 20 7 2 18 8 2 26 9 2 26 10 3 16 表 2 不同方法预测结果
Table 2. Prediction results using different methods
参数 平均绝对误差 平均相对误差/% 最大熵粒子滤波 6.94 1.31 传统粒子滤波 197.89 33.30 GM模型 71.67 16.47 -
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