Journal of Mechanical Science and Technology

The Korean Society of Mechanical Engineers (대한기계학회)
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Study on the Damping Performance Characteristics Analysis of Shock Absorber of Vehicle by Considering Fluid Force

  • Lee Choon-Tae (Department of Mechanical and Intelligent Systems Engineering, Busan National University) ;
  • Moon Byung-Young (ILIC (Industrial Liaison Innovation Cluster), Pusan National University)
  • Published : 2005.02.01
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Abstract

In this study, a new mathematical dynamic model of displacement sensitive shock absorber (DSSA) is proposed to predict the dynamic characteristics of automotive shock absorber. The performance of shock absorber is directly related to the vehicle behaviors and performance, both for handling and ride comfort. The proposed model of the DSSA has two modes of damping force (i.e. soft and hard) according to the position of piston. In this paper, the performance of the DSSA is analyzed by considering the transient zone for more exact dynamic characteristics. For the mathematical modeling of DSSA, flow continuity equations at the compression and rebound chamber are formulated. And the flow equations at the compression and rebound stroke are formulated, respectively. Also, the flow analysis at the reservoir chamber is carried out. Accordingly, the damping force of the shock absorber is determined by the forces acting on the both side of piston. The analytic result of damping force characteristics are compared with the experimental results to prove the effectiveness. Especially, the effects of displacement sensitive orifice area and the effects of displacement sensitive orifice length on the damping force are observed, respectively. The results reported herein will provide a better understanding of the shock absorber.

Keywords

References

  1. Adrian Simms, David Crolla, 2002, 'The Influence of Damper Properties on Vehicle Dynamic Behavior,' SAE 2002-01-0319, pp.79-86
  2. Herr, F., Malin, T., Lane, J. and Roth, S., 1999, 'A Shock Absorber Model Using CFD Analysis and Easy 5,' in: Proceedings of the 1999 SAE International Congress and Exposition, 1999-01-1322
  3. Jaewoo Park, Dongwoo Joo and Youngho Kim, 1997, 'A Study on the Stroke Sensitive Shock Absorber,' Journal of Korean Society of Precision Engineering, 14, pp. 11-16
  4. John G. Cherng, Tone Ge, John Pipis and Richard Gazala, 1999, 'Characterization of Air-Borne Noise of Shock Absorber by Using Acoustics Index Method,' in: Proceedings of the 1999 SAE International Congress and Exposition, 1999-01-1838
  5. Koenraad Reybrouck, 1994, 'A Nonlinear Parametric Model of an Automotive Shock Absorber,' SAE 940869, pp.79-86
  6. Kyungil Cho and Sanggyun So, 1999, 'A Study of the New Typed Stroke Dependent Damper,' J of KSAE, Vol. 7, No.3, pp.294-300
  7. Lang Harold Harvey, 1977, 'A Study of the Characteristics of Automotive Hydraulic Dampers at High Stroking Frequencies,' Ph. D. Thesis, Department of Mechanical Engineering, University of Michigan, U.S.A.
  8. Liu, Y., Zhang, J., Yu, F. and Li, H., 2002, 'Test and Simulation of Nonlinear Dynamic Response for the Twin-tube Hydraulic Shock Absorber,' SAE 2002-01-0320, pp.91-98
  9. Stefaan W. Duym, Randy Stiens, Gino V. Baron and Koenraad G. Reybrouck, 1997, 'Physical Modeling of the Hysteretic Behavior of Automotive Shock Absorbers,' SAE (Society of Automotive Engineers) 970101, pp. 125-137