基于OHF Elman-AdaBoost算法的滚动轴承故障多时期诊断方法

针对随机噪声下滚动轴承多时期(初期、中期、晚期)故障诊断需求,提出OHF Elman-AdaBoost(output hidden feedback Elman-adaptive boosting)算法,以实现滚动轴承的精确故障诊断。采用集合经验模态分解(ensemble empirical mode decomposition,EEMD)对原始信号进行分解、降噪、信号重构。设计OHF Elman方法在Elman神经网络的基础上增加输出层对隐含层的反馈,提高了其对动态数据的记忆功能。选择OHF Elman神经网络作为弱回归器,结合AdaBoost算法集成出一种新的强回归器:OHF Elman-AdaBoost算法。实验结果表明,该算法不仅对滚动轴承不同故障时期具有很好的诊断效果,而且提高了对全样本数据的诊断准确度,为滚动轴承故障诊断提供了新型工具和有效方案。

Multi-period fault diagnosis of rolling bearings based on the OHF Elman-AdaBoost algorithm

In order to meet the needs of the multi-period fault diagnosis of rolling bearings under random noise,the OHF Elman-AdaBoost(output hidden feedback Elman-adaptive boosting)algorithm was proposed to achieve the accurate fault diagnosis of rolling bearings.The original signal was decomposed,denoised and reconstructed by the ensemble empirical mode decomposition(EEMD).The OHF Elman neural network improved the memory function for its dynamic data by adding feedback from the output layer to the hidden layer based on the Elman neural network.Then,a strong regressor(OHF Elman-AdaBoost algorithm)was integrated by selecting the OHF Elman neural network as the weak regressor and combining with the AdaBoost algorithm.The experimental results show that the OHF Elman-AdaBoost algorithm not only has a good diagnostic effect on different periods of rolling bearing faults,but also improves the diagnostic accuracy of the full sample data,providing a new tool and effective solution for the fault diagnosis.