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Effects of Cylinder Shell Elasticity on Effective Bulk Modulus of Oil in Automotive Hydraulic Dampers  

이일영 (부경대학교 기계공학부)
손단단 (부경대학교 대학원 기계공학부)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.12, no.5, 2004 , pp. 187-197 More about this Journal
Abstract
This paper presents the effects of cylinder shell elasticity on effective bulk modulus of oil $K_e$ in automotive hydraulic dampers. A theoretical model of cylinder shell bulk modulus $K_c$ based on the elasticity theory of thick-walled cylinder incorporating not only radial but longitudinal deformation is proposed. In a cylinder, values of $K_c$ by the new model and traditional models are computed and the discrepancies among them are discussed. In a twin-tube type automotive damper, the variation of $K_e$ under different pressure values in chambers of the damper cylinder, based on different theoretical models for $K_c$ is computed. Through these computations, it is shown that remarkable discrepancies in computed values of $K_e$ might occur according to the $K_e$ models in connection with $K_c$ models.
Keywords
Effective bulk modulus; Effective bulk modulus of cylinder; Automotive hydraulic damper;
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