Research on Dynamic Characteristics and Structural Optimization of Porous Gas Bearings in Linear Compressors

Abstract

Abstract In order to study the influence of structural parameters of porous gas bearing and operating parameters of linear compressor on the static and dynamic performance of porous gas bearing, based on gas lubrication theory, Darcy's law and Reynolds equation, the mathematical model and simulation model of porous gas bearing of linear compressor are derived and established. The static and dynamic characteristics of the porous gas bearing of the linear compressor are studied by using Fluent software simulation. According to the simulation results, the effects of inlet pressure, porous material thickness and gas gap on the gas consumption and bearing capacity of the porous gas bearing under different eccentricities are analyzed. The results show that the higher the inlet pressure is, the larger the gas consumption and bearing capacity; the thicker the porous material is, the smaller the gas consumption and the larger the bearing capacity, the thicker the gas gap is, the larger the gas consumption and the smaller the bearing capacity. Based on the simulation study, the multi-objective optimization of the porous gas bearing was carried out based on the response surface method according to the gas consumption and load carrying capacity of the gas bearing and considering the processing and assembly difficulties, and the gas supply pressure was selected between \(0.3\sim0.5MPa\), the thickness of the porous material between \(3\sim5mm\) and the thickness of the air gap between \(10\sim20\mu m\). While ensuring the stable operation of the linear compressor, the optimal combination of design parameters is provided for the optimal design of gas bearings used in linear compressors.