Vibration Measurement Of Power Transmission Belts Through Electrostatic Sensing

Belt drives are widely used to transmit power between shafts in a variety of industrial,automotive,agricultural and home appliance applications.They have many advantages such as simple structure,smooth transmission,low noise,shock absorption and so on.The vibration measurement of power transmission belts is of great importance for the fault diagnosis and prognosis of industrial belt drive systems.This paper presents an electrostatic sensor working in charge-mode that monitors belt vibration through detection of static charge on the belt.The main contribution of this thesis can be summarized as follows:First,according to the principle of electrostatic induction,an electrostatic sensor working in charge-mode is used to measure the vibration displacement of the power transmission belt.Second,comparative experiments between the laser displacement sensor and the electrostatic sensor are carried out.The results show that the electrostatic signal has high correlation with the displacement signal.Therefore,The validity of the electrostatic sensing based method is verified by experiments.Third,the frequency domain decomposition method is applied to the vibration analysis for the first time.At the same time,the operating deflection shape(ODS)is used to analyze the vibration.According to the requirements of the vibration measurement and analysis,a test rig of belt vibration measurement was designed which allows adjustment of change the length,tension and velocity of the belt.The effects of these factors on the vibration of the belt are studied by comparing the vibration frequency,vibration mode and ODSs of the belt under different operating conditions.Finally,by comparing the results of the two analysis methods,the characteristics and difference of the two methods are summarized.