电光与控制, 2019, 26 (10): 73, 网络出版: 2020-12-17  

基于双尺度比例判据的解模态混叠算法

An Algorithm for Releasing Modal Aliasing Based on Two-Scale Proportional Criterion
作者单位
火箭军工程大学控制工程系, 西安 710025
摘要
针对经验模态分解在实际应用中因异常信号导致的模态混叠问题, 提出了一种基于双尺度比例的判据和局部EMD的处理方法。首先分析了异常信号对EMD算法的影响, 之后提出了基于时间特征尺度和极值差(双尺度)的判据;通过该判据确定异常信号的时域位置后, 再对该时段信号进行局部经验模态分解, 实现异常信号和固有信号的分离。数值仿真实验以及对比分析表明,相比传统方法, 所提方法能够更加有效地抑制因异常信号产生的模态混叠问题。
Abstract
This paper focuses on the modal aliasing resulted from the abnormal signal in practical applications of Empirical Mode Decomposition (EMD). A method based on two-scale proportional criterion and local EMD is proposed. First, an analysis is made to the impact of the abnormal signals on EMD algorithm, and the two-scale criterion combining the time characteristic scale with the extreme difference is established. The time domain location of the abnormal signal is determined by the criterion, and the abnormal signal is then separated from inherent signal by means of local EMD during the period. Numerical simulation results and comparative analysis show that the method can settle the problem of modal aliasing caused by abnormal signal more effectively compared with conventional methods.

张优, 胡昌华, 李红增, 扈晓翔, 白灿, 张鹏. 基于双尺度比例判据的解模态混叠算法[J]. 电光与控制, 2019, 26(10): 73. ZHANG You, HU Changhua, LI Hongzeng, HU Xiaoxiang, BAI Can, ZAHNG Peng. An Algorithm for Releasing Modal Aliasing Based on Two-Scale Proportional Criterion[J]. Electronics Optics & Control, 2019, 26(10): 73.

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