Jae Ung Cho ¹, Key Sun Kim ¹

Affiliations
1 Research Institute of Green-Car Technology, Kongju National University, KR

Abstract

The present article is a study on flow analysis for compressor as an air producing apparatus for air lumber support applied to automobile seat. The compressor type for application is a swash plate pump where 4 EA of plungers are operated sequentially. After modeling of the product, working pressure for each part, flow direction, flow velocity, flux of fluid are derived for analysis. For this purpose, analysis is made by using Analysis finite element analysis program after 3D modeling of swash plate compressor used for air bag type of lumber support with CATIA V5 R18 program. Processes where 4 pumps are sequentially operated during 1 stroke, and flow velocity and pressure of air at that time are obtained from the piston for analysis. Based on this result, major design factor variables are derived to allow application upon design.

Keywords

Filling Fluid, Heat Pipe, Heat Radiation, Heat Transfer, Vehicle.

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Sung Yuk Kim ¹, Jong Rok An ², Key Sun Kim ³

Affiliations
1 Department of Mechanical Engineering, Graduate School, Kongju National University, Korea
2 R&D Center, Easternftc INC., Korea
3 Division of Mechanical and Automotive Engineering, Kongju National University, Korea

Abstract

Objectives: Since the riding comfort upon seating is determined according to the driving environment or the driver’s preference, objective evaluations are accompanied by many constraints. Methods/Statistical Analysis: Variations in stiffness distribution of the seat cushion were analyzed by using body pressure distribution. First, to identify loaddeflection characteristics of the seat cushion, static load tests were conducted and stiffness characteristics as a function of load were affirmed by application of quadratic spline interpolation method. And, body pressure distribution of the male subject produced upon seating in the cushion was measured under actual vehicle conditions. Findings: Variations in stiffness distribution of the seat cushion produced when a driver comes aboard a vehicle, and the following conclusions could be obtained. First, by conducting static load tests for the seat cushion to obtain load-deflection curves, deflection characteristics per load point were identified. Second, through quadratic function for the load-deflection curves derived from static load tests, stiffness distributions were derived. Stiffness characteristics were continuously varied as a function of load distribution applied to the seat cushion, which was analyzed to have an effect on stiffness distribution as a function of body pressure distribution for the driver. Third, based on body pressure distribution data for the male subject and load-deflection curves for the seat cushion, variations in stiffness of the seat cushion were analyzed as a function of body pressure distribution. As a result, the extent of hardness felt by the human body was greater for the right side even if body pressure of the male subject was shown to be larger in the left-side region. Application/Improvements: Characteristics of seat stiffness distribution as a function of body pressure distribution which were derived in the present study are considered to be utilized for pad development of car seat.

Keywords

Body Pressure Distribution, Deflection, Seat Cushion, Stiffness, Vehicle.

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