基于横向振动的旋转机械扭振信号提取方法

Method of Extracting Torsional Vibration Signal Based on Lateral Vibration Signal in Rotating Machinery

在转子系统中存在横向振动与扭转振动的耦合,扭转振动的信息被调制在横向振动之中。鉴于此,提出一种基于横向振动传感器信号提取微弱扭转振动信息的方法。通过对横向振动信号进行Hilbert振动分解得到单一成分的信号,再通过Hilbert变换从中提取相位角,分解相位角即可获得扭振信号,进而计算出原始扭振信号的幅值与频率。数值仿真和试验结果表明,该方法可以精确地获取扭振信号,具有较高的频率分辨率,试验提取得到的频率相对误差仅为0.38%,并通过工业级离心压缩机试验台验证了其工程应用的可行性。该方法可实现对未安装专门扭振测试仪的机组进行扭振补充监测,提供了一种工程扭振监测的便捷途径。

Lateral and torsional vibrations are coupled with each other in a rotor system,and the information of torsional vibration is modulated in lateral vibration signals.In view of this,a method of extracting weak torsional vibration signal from lateral vibration signals is proposed in this paper.Specifically,the Hilbert vibration decom‑posing is firstly applied on the lateral vibration signal to obtain a single-component signal,which is used to extract the phase angle with Hilbert transformation,and then the phase angle is decomposed to extract the torsional vibration signal.After that,the amplitude and frequency of the original torsional vibration signal are obtained.Numerical simulation and experimental results indicate that the method can accurately detect torsional vibration signals,with a high frequency resolution,and the error of extracted torsional frequency in the experiment is merely 0.38%.An industrial scale of centrifugal compressor experimental platform is employed to validate its feasible application in engineering as well.This method can enable an additional monitoring of torsional vibrations for the machines without dedicated torsional vibration testers,providing a convenient way to measure torsional vibrations in engineering.