A vibration testing system for a roots blower rotorbased on a virtual instrument

摘要

In this paper, on the basis of traditional rotor fault diagnosis and vibration measurement technology, and combined withrotor dynamics, a virtual instrument and digital signal processing technology, an online monitoring system for the rotorof a roots blower is set up. The system is made up by a sensor, a signal conditioning circuits, a data acquisition cards anda computer. By the graphical design software LabVIEW, the signals of the rotor system such as speed, amplitude,frequency and axes orbit can be monitored in the real time-domain. Regarding the rotor vibration characteristics in thetime- and frequency-domain as the major fault symptoms and using spectrum analysis or time-domain analysis to dealwith all data, it provides the characteristics and mapping to inform about the operating state of the rotor system. Finally,by means of the model test, the dynamic characteristics of a rub-impact rotor are analyzed, and the reliability of thesystem is verified.