Active Control of Transient Vibration of Turbocharger Rotor Based on Piezoelectric Drive Floating Ring Bearing Adjustable Clearance

doi:10.3901/JME.2023.18.031

Abstract

Abstract: Aiming at the problem that the turbocharger rotor system needs to be frequently started and stopped during operation, the working speed range is large, and the speed changes quickly, the vibration is difficult to control. Based on the concept of artificial self-healing engineering, the oil film clearance and the rotor system in the full speed range are studied Vibration response characteristics, it is proposed to use piezoelectric ceramics to adjust the outer oil film gap of the floating ring bearing to change the system damping so as to realize the rapid and accurate control of the rotor system vibration. Taking a certain gasoline engine turbocharger rotor system as an example, the damping coefficient of the bearing oil film is inversely proportional to the cubic power of its clearance. Construct a dynamic finite element model of the floating ring bearing rotor system under different outer oil film gaps, perform time-domain and frequency-domain nonlinear transient response analysis, obtain the frequency amplitude and vibration waterfall chart at full speed, and find out the three speeds of low, medium and high The best oil film gap corresponding to the minimum vibration amplitude of the rotor system under the section, thereby constructing the mapping matrix of the oil film gap and the vibration response. The outer oil film gap adjustment device based on the piezoelectric drive bearing seat is designed, and the vibration active control strategy in different speed segments is adopted, and the corresponding vibration control simulation experimental device is built to verify that the bearing gap adjustment time of the control system is less than 10 ms, and the maximum displacement error is less than 0.5 μm, which can meet the requirements of real-time vibration control. This method can provide new ideas for mechanical vibration control of high-speed rotors.

Key words: active transient vibration control, piezo drive, outer oil clearance, vibration response characteristics, turbocharger rotor

CLC Number:

TH113

BIN Guangfu, ZHONG Xinli, ZHANG Yangyan, YANG Feng, CHEN Anhua. Active Control of Transient Vibration of Turbocharger Rotor Based on Piezoelectric Drive Floating Ring Bearing Adjustable Clearance[J]. Journal of Mechanical Engineering, 2023, 59(18): 31-41.

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