Fault simulation of rotor unbalance and unbalance responses test analysis platform

WANG Ai-ming1, ZHANG Tian-shuo1, YAO Wei1,2, SHA Tao3, GE Tian1, ZHANG Zi-yang1
(1.School of mechanical Electrical and Information Engineering, China University of Mining and Technology,
Beijing 100083, China; 2.China Energy Ningxia Coal Industy Group Co., Ltd., Ningxia 750011, China;
3.Wulanchabu Electric Power Bureau of Inner Mongolia Electric Power(Group)
Co., Ltd., Wulanchabu 012000, China)

Abstract: Aiming at the problem that it is very difficult to study the rotor unbalance identification problem using measured unbalance responses by applying unbalance to large rotating machineries experimentally, a rotor unbalance fault simulation and vibration test and analysis platform was developed. The rotorbearing system was developed by using a DC motor and its driver, rolling bearing, shaft, eccentric disc and so on. The rotor unbalance fault was simulated by changing the installation position of the counterweight in the disc. The hardware of the vibration test and analysis platform was designed by using eddy current displacement sensor, photoelectric sensor, data acquisition card and so on. Moreover, a measurement and analysis software of the unbalance response was developed based on the method of intercepting pulse analysis by using LabVIEW. The unbalance response of the shaft and one key-phase pulse signal was synchronously acquired. The acquired data was saved in the computer, the amplitude and phase of the unbalance response was identified. Considering the measurement noise, a simulation experiment based on LabVIEW was designed. The results indicate that the amplitude and phase of the unbalance response can be identified correctly. The identification error is different with different intercepted analysis periods, the maximum relative error of amplitude is 2023 9%, and the maximum absolute error of phase is 2.441 9°.
Key words: bearingrotor system; unbalance identification; fault simulation; vibration test and analysis of unbalance response