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Received March 15, 2010
Accepted April 11, 2010
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저속용 피스톤에 가해지는 오일의 속도분포와 정압분포 특성
A Study on the Features of the Velocity Distribution and the Static Pressure Distribution of Oil on a Low-velocity Piston
중소기업개발연구원, 616-120 부산시 북구 화명동 2333 1부경대학교 안전공학부, 608-739 부산시 남구 용당동 산 100 2(주)우창, 621-800 경남 김해시 진영읍 10-3
Institute of Small & Medium Industry Development Co., 2333 Hwamaeong-dong, Buk-gu, Busan 616-120, Korea 1School of Safety Engineering, Pukyong National University, San 100, Yongdang-dong, Nam-gu, Busan 608-739, Korea 2Woochang Co. Ltd, 10-3, Jinyoung-eub, Kimhae-si, Gyeongnam 621-800, Korea
jwchoi@pknu.ac.kr
Korean Chemical Engineering Research, August 2010, 48(4), 450-456(7), NONE Epub 8 September 2010
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Abstract
Shock absorber의 부품인 피스톤을 설계하기 위하여 저속용 피스톤에 가해지는 오일의 속도분포와 정압분포의 특성을 파악하였다. 오리피스를 통과하는 압축속도는 0.0156~0.0642 m/s를 나타났으며, 0.9 mm인 orifice의 속도분포와 정압분포 속도벡터는 속도가 클수록 회전하려는 경향이 커졌다. 0.8 mm인 orifice의 속도분포와 정압분포 속도벡터는 2차적으로 속도가 변하였고 두 번째 압력강하가 발생하였으며, orifice 근처 유선의 분포는 orifice 중심을 기준으로 와류가 발생하였다. 압축실에서 인장실로 통과하는 속도분포는 직경이 작은 orifice에서 속도가 크게 나타났으며, 압축실과 인장실의 압력차가 크면 클수록 피스톤에 작용하는 힘이 크게 나타났다.
This study was conducted in order to design a piston, part of a shock absorber, and the findings after examining the features of the velocity distribution and the static pressure distribution of oil on a low-velocity piston are as follow. The compression speed of oil passing through an 0.9 mm orifice was 0.0156~0.0642 m/s, and the velocity vector of the velocity distribution and the static pressure distribution had a greater tendency to rotate when the velocity increased. In case of the velocity vector of the velocity distribution and the static pressure distribution with an 0.8mm orifice, the speed changed secondarily, the second pressure-drop was observed and as for the distribution of the streamline around the orifice, a vortex was produced around the center. As for the velocity distribution of oil passing from the compression cylinder to the compact pipe, the velocity was greater in orifice of small diameter. Also, the greater the pressure difference was between the compression cylinder and the compact cylinder, the greater the force it was upon the piston.
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Reybrouck K, “A Nonlinear Parametric Model of an Automotive Shock Absorber,” SAE paper 940869, 79-86 (1994)
McManus SJ, Clair KAS, “Vibration and Shock Isolation Performance of a Commercial Semi-Active Vehicle Seat Damper,” SAE paper, 1-7 (2000)
Gunston T, “An Investigation of Suspension Seat Damping Using a Theoretical Model,” The 35th meeting of the U. K. Group on Human Response to Vibration, 137-149 (2000)
Lin Y, Zhang J, Mechanics Research Communications, 29, 359 (2002)
Park KS, Kim JR, Kim DS, “A Study on the Dynamic Characteristics of the Continuously Variable Shock Absorber for Semi-Active Damping Control System,” SAE paper, 1-6 (2005)
Gunston TP, Rebelle J, Griffin MJ, Journal of Sound and Vibration, 278, 117 (2004)
Oh S, Yeo YK, Korean Chem. Eng. Res., 45(3), 234 (2007)
Song X, Ahmadian M, “Study of Semiactive Adaptive Control Algorithms with Magneto-Rheological Seat Suspension,” SAE paper, 1-12 (2004)
Simms A, Crolla D, “The Influence of Damper Properties on Vehicle Dynamic Behavior,” SAE paper, 79-86 (2002)
Ivers EM, Miller LR, “Semiactive Suspension Technology: An Evolutionary View,” ASME Advanced Automotive Technologies, DE-40, 1991, Book No. H00719, 327-346 (1991)
Duym SW, Stiens R, Baron GV, Teybrouck KG, “Physical Modeling of the Hysteretic Behavior of Automotive Shock Absorbers,” SAE paper 970101, 125-137 (1997)
Lin Y, Zhang J, Yu F, Li H, “Test and Simulation of Nonlinear Dynamic Response for the Twin-Tube Hydraulic Shock Absorber,” SAE paper, 91-98 (2002)
