Research on Mono-Fractal Characteristics of Dynamic Pressure at the Outlet of Centrifugal Compressor Based on EWT

Volume 5: Dynamics, Vibration, and Control Pub Date : 2022-10-30 DOI:10.1115/imece2022-94792

Yan Liu, Yuchen Li, Jincheng Geng

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Abstract

In this paper, the outlet dynamic pressure of 800kw centrifugal compressor is taken as the research object, and the nonlinear characteristics of the system under different working conditions are analyzed by using empirical wavelet transform combined with mono-fractal. Firstly, the characteristics of the dynamic pressure signal when the system enters the surge state from the steady state through the transition process are analyzed, and the spectrum analysis of the dynamic pressure signal is carried out. Secondly, the modal components of the signal are extracted by empirical wavelet transform and the signal is reconstructed according to the correlation coefficient. Finally, the autocorrelation function of the reconstructed signal in different states and its Hurst parameters are studied. The research results show that when the system enters the surge state from the steady state, the spectrum of the dynamic pressure signal gradually concentrates to the low frequency band. And, the autocorrelation function and Hurst parameter of the reconstructed signal can effectively reflect the working state of the system.

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基于EWT的离心压缩机出口动压单分形特性研究

本文以800kw离心式压缩机出口动压为研究对象，利用经验小波变换结合单分形分析了系统在不同工况下的非线性特性。首先，分析了系统从稳态通过过渡过程进入喘振状态时的动压信号特征，并对动压信号进行了频谱分析。其次，通过经验小波变换提取信号的模态分量，并根据相关系数重构信号;最后，研究了重构信号在不同状态下的自相关函数及其Hurst参数。研究结果表明，当系统从稳态进入喘振状态时，动态压力信号的频谱逐渐向低频集中。重构信号的自相关函数和Hurst参数能有效地反映系统的工作状态。

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Volume 5: Dynamics, Vibration, and Control

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