Life prediction method of rolling bearings in noisy environments based on IKF-ARIMA-NARNN model
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摘要:
针对滚动轴承振动信号性能特征参数中不可避免地受环境噪声影响,同时又不具备马尔科夫特性的情况,提出基于IKF-ARIMA-NARNN的滚动轴承噪声环境下寿命预测方法。首先,考虑到传统卡尔曼滤波(KF)去噪忽略了数据间相关性的问题,提出一种基于增量卡尔曼滤波(IKF)的滚动轴承性能特征数据去噪方法。其次,针对滚动轴承性能特征参数演化过程有时不满足马尔科夫特性,建立基于具有非线性误差项的自回归差分移动平均(ARIMA)模型的滚动轴承性能特征参数演化过程分析模型;同时,利用动态非线性自回归神经网络(NARNN)估计退化模型非线性随机误差项,从而实现滚动轴承寿命预测。最后,通过滚动轴承工程实例分析,验证了该文方法的有效性和适用性,与传统方法相比,该方法的预测精度至少提高26.75%和51.25%。
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关键词:
- 滚动轴承 /
- 噪声环境 /
- 寿命预测 /
- 非线性自回归神经网络(NARNN) /
- 自回归差分移动平均(ARIMA) /
- 增量卡尔曼滤波(IKF)
Abstract:In view of the fact that the performance characteristics of rolling bearings vibration signals are inevitably affected by environmental noise and lack of Markov characteristics, a life prediction method of rolling bearings in noisy environment based on IKF-ARIMA-NARNN was proposed. Firstly, considering that the Kalman filter (KF) denoising ignored the correlation of data, a denoising method based on incremental Kalman filter (IKF) was proposed. Secondly, due to the evolution process of bearing performance characteristic parameters that fails to meet the Markov characteristics sometimes, an analysis model of the evolution process of bearing performance characteristic parameters based on the autoregressive integrated moving average (ARIMA) with nonlinear error term was established. At the same time, the dynamic nonlinear autoregressive neural network (NARNN) was used to estimate the nonlinear random error term of the degradation model, so as to realize the life prediction of rolling bearings. Finally, the effectiveness and applicability of the proposed method was verified by the case analysis of rolling bearing engineering, and the prediction accuracy was at least 26.75% and 51.25% higher than the traditional method.
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表 1 3种去噪方法的SNR和MSE对比
Table 1. Comparison of SNR and MSE of the three denoising methods
方法 信噪比 均方误差 卡尔曼滤波 16.4448 0.6726 小波阈值 26.9660 0.0597 增量卡尔曼滤波 29.8079 0.0390 表 2 1号轴承预测MAE和MRE对比
Table 2. Comparison of MAE and MRE of bearing 1
模型 MAE MRA RBFNN 3.8464 0.5857 NARNN 0.7239 0.0999 ARIMA-NARNN 0.5662 0.0801 IKF-ARIMA-NARNN 0.3477 0.0582 表 3 2号轴承预测MAE和MRE对比
Table 3. Comparison of MAE and MRE of bearing 2
模型 MAE MRE RBFNN 2.3131 0.3363 NARNN 0.7078 0.0971 ARIMA-NARNN 0.5317 0.0848 IKF-ARIMA-NARNN 0.3094 0.0518 表 4 寿命预测对比
Table 4. Comparison of life predictions
模型 1号 2号 $\hat l_{{k}} $/min 绝对
误差$\hat l_{{k}} $/min 绝对
误差Wiener 12110.44 5.44 5329.79 9.21 NARNN 12090.44 14.56 5354.76 15.76 ARIMA-NARNN 12109.01 4.01 5345.13 6.13 IKF-ARIMA-NARNN 12106.53 1.53 5343.49 4.49 -
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