Improving Camper Comfort by Optimizing the Vibration Isolation of Air-Conditioning Compressor

Hui Shi,Liang Sun,Zhiyong Chen,Wenku Shi,Bekir Sahin

doi:10.1155/2020/2958604

Abstract

Compressors are the main excitation source of vibration and noise in camper air-conditioning systems, which directly affects the NVH characteristics in campers. The vibration and noise reduction for camper comfort improvement can be implemented by the optimization method. This paper presents vibration and noise improvement in camper by systematically optimizing the vibration isolation performance of air-conditioning compressor. To analyze the compressor vibration characteristics, operational vibration tests under different conditions and modal identification are implemented. Based on the analysis results, a genetic algorithm is used to optimize the stiffness of the compressor vibration isolation element by the energy decoupling method (EDM). The stiffness, natural frequencies, and energy decoupling rate (EDR) of the compressor vibration isolation system (CVIS) are compared between preoptimization and postoptimization. The stiffness and strength characteristics of the optimized isolation system are verified by the finite element method. Operational vibration and noise tests of a camper are performed to validate the optimization effect. The improvement of camper comfort demonstrates that the proposed optimization procedure of CVIS is effective.

Highlights

With the rapid development of the social economy and improvements in road and transportation infrastructure, campers have become a popular choice for high-end selfdriving travel
The using comfort of campers can be largely affected by the NVH characteristics, which is mainly caused by air-conditioning systems (ACSs), especially for trailer-type campers; much research is required to reduce the NVH of ACSs for improving camper comfort, which is mainly caused by the compressors
The compressor produces the gas force, the friction force between the roller and cylinder, and inertia force of unbalanced mass of shaft during the variation of cylinder working volume; on the other hand, the compressor is driven by permanent magnet synchronous motor, for which the electromagnetic vibration is brought on by the radial force, cogging torque, pulsating torque, and inverter harmonics during operational vibration measurement. e excitation forces is correlated with both the electromagnetic and the mechanics. e vibration characteristics of the camper air-conditioning system are different from other vibration systems. erefore, some different points in the vibration and noise investigation are considered

Summary

Introduction

With the rapid development of the social economy and improvements in road and transportation infrastructure, campers have become a popular choice for high-end selfdriving travel. The using comfort of campers can be largely affected by the NVH characteristics, which is mainly caused by air-conditioning systems (ACSs), especially for trailer-type campers; much research is required to reduce the NVH of ACSs for improving camper comfort, which is mainly caused by the compressors. E vibration characteristics of the camper air-conditioning system are different from other vibration systems. For the NVH improvement research of ACSs with horizontal rolling rotor compressor, many scholars have carried out much work to reduce the vibration and noise level of ACSs by using lots of methods. All the above research on vibration attenuation of compressor is mainly on the natural characteristics analysis by FEM, source property analysis, and vibration response

Methods

Results

Conclusion