关键词: 提升方案, 预测器, 更新器, 自适应, 故障分析

Abstract: The lifting scheme can only change the predictor and updater to construct the appropriate wavelet，which facilitates the wavelet function selecting in the mechanical equipment fault analysis.In order to adaptively select the wavelet function matching the signal feature better，an update/prediction adaptive lifting wavelet transform is proposed.In the method，an adaptive update/prediction lifting scheme is used，which realizes adaptive update and prediction respectively by the local gradient information of original signal and minimum prediction error.The experimental results show the proposed method plays more effectively in failure analysis of aeroengine signal than classical wavelet transform.

Key words: lifting scheme, predictor, updater, adaptive, fault analysis