轴承转子系统快变过程振动响应的高精度频谱分析  

High-Precision Frequency Spectrum Analysis of Vibration Response of Bearing Rotor System in Fast-Changing Process

作　　者：陈润霖[1] 刘佳鑫 唐杰 徐帆 张延超[1] 崔亚辉[1] CHEN Runlin;LIU Jiaxin;TANG Jie;XU Fan;ZHANG Yanchao;CUI Yahui(School of Mechanical and Precision Instrument Engineering,Xi′an University of Technology,Xi′an Shaanxi 710048,China)

机构地区：[1]西安理工大学机械与精密仪器工程学院,陕西西安710048

出　　处：《机床与液压》2024年第11期219-225,共7页Machine Tool & Hydraulics

基　　金：国家自然科学基金青年科学基金项目(11802232);陕西省重点研发计划资助项目(2022GY-209);中国博士后科学基金资助项目(2021MD703875)。

摘　　要：针对高速轴承转子系统的启停过程,研究平稳和非平稳信号的高精度频谱分析方法,利用比例校正法对平稳信号频谱分析后的频率、幅值、相位进行了校正,建立一种将t时空域非平稳信号转变为t~2时空域平稳信号的方法,并基于平稳信号的比例校正法对其进行频谱分析,最后返回到t时空域获得某时刻的频域参数。仿真分析结果表明:该方法可以准确提取平稳信号的谱特征,也能较精确地提取非平稳信号特定时刻的频率、幅值和相位,提取结果精度较好,有效解决轴承转子系统快变过程的谱分析特征提取问题,为动力学特性分析提供了新思路。During the start-stop process of high-speed bearing rotor system,the high-precision spectrum analysis method of stationary and non-stationary signals was studied.The frequency,amplitude and phase of stationary signal spectrum analysis were corrected by proportional correction method.A method for transforming non-stationary signals in the t-time domain into stationary signals in the t~2 time domain was studied.Based on the stationary signal,the spectral analysis was performed using the proportional correction method,finally the results were returned to the t-time domain to obtain the frequency domain parameters at a certain moment.The simulation analysis demonstrates the method can accurately extract both the spectral characteristics of the stationary signal and the frequency,amplitude,and phase of the non-stationary signal at a specific time,by which the problem of spectral analysis feature extraction of the fast-changing process of the bearing rotor system is effectively solved.It provides a new idea for the analysis of dynamic characteristics.

关 键 词：轴承转子系统 快变过程 非平稳信号 高精度频谱分析 快速傅里叶变换 

分 类 号：TH113.1[机械工程—机械设计及理论]