Refining the time-frequency characteristic of non-stationary signal for improving time-frequency representation under variable speeds.

ABSTRACT: Time-frequency ridge not only exhibits the variable process of non-stationary signal with time changing but also provides the information of signal synchronous or non-synchronous components for subsequent detection research. Consequently, the key is to decrease the error between real and estimated ridge in the time-frequency domain for accurate detection. In this article, an adaptive weighted smooth model is presented as a post-processing tool to refine the time-frequency ridge which is based on the coarse estimated time-frequency ridge using newly emerging time-frequency methods. Firstly, the coarse ridge is estimated by using multi-synchrosqueezing transform for vibration signal under variable speed conditions. Secondly, an adaptive weighted method is applied to enhance the large time-fr

SUBMITTER: Liu Y 

PROVIDER: S-EPMC10063649 | biostudies-literature | 2023 Mar

REPOSITORIES: biostudies-literature