Vibration isolation characteristics and control strategy of parallel air spring system for transportation under abnormal road and eccentric load conditions

Tian He,Guangtong Liu,Xiandong Liu,Di Qu

doi:10.1177/0020294021996631

Tian He, Guangtong Liu + Show 2 more

Open Access

https://doi.org/10.1177/0020294021996631

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Abstract

The precision equipment bears the vibration excited by the road roughness during transportation, and faces the risk of damage arising from the vibration. The parallel air spring vibration isolation system (PAVS) has an excellent vibration isolation performance, so has a good application prospect in the precision equipment transportation. But under the conditions of abnormal road and eccentric load, PAVS bears great vibration excitation, and the resulting large deformation of air spring makes the air spring stiffness nonlinear, so to obtain an excellent vibration isolation performance faces a great challenge. Aiming at this problem, based on the measured parameters, the nonlinear dynamics model of PAVS is proposed. Then, the influence of air spring under large deformation on the vibration isolation characteristics is discussed. Finally, under the condition of eccentricity of precision equipment, the vibration isolation characteristics of PAVS with equal height control strategy is investigated. The results show that PAVS with the equal height control strategy has good vibration isolation characteristics. So for the transportation of large precision equipment, PAVS is a potentially useful method.

Highlights

When satellite, medical instrument, and other precision equipment are transported, the vibration is inevitable
The air spring stiffness and the damping are necessary to be adjusted based on the road conditions to obtain a positive vibration isolation effect
To reduce the influence of load eccentricity and achieve an acceptable vibration isolation effect, we introduce the equal height control strategy in the system

Summary

Introduction

Medical instrument, and other precision equipment are transported, the vibration is inevitable. In accordance with the results from the nonlinear model, the vibration isolation effect is best when the working height of air spring is 19 cm. In accordance with the simulation results from the nonlinear model, the vibration isolation effect is best when the working height of air spring is 16 cm.

Results

Conclusion