This content is not included in your SAE MOBILUS subscription, or you are not logged in.
An Experimentally Validated Physical Model of a High-Performance Mono-Tube Damper
ISSN: 0148-7191, e-ISSN: 2688-3627
Published December 02, 2002 by SAE International in United States
Annotation ability available
A mathematical model of a gas-charged mono-tube racing damper is presented. The model includes bleed orifice, piston leakage, and shim stack flows. It also includes models of the floating piston and the stiffness characteristics of the shim stacks. The model is validated with experimental tests on an Ohlins WCJ 22/6 damper and shown to be accurate. The model is exercised to show the effects of tuning on damper performance. The important results of the exercise are 1) the pressure variation on the compression side of the piston is insignificant relative to that on the rebound side because of the gas charge, 2) valve shim stiffness can be successfully modeled using stacked thin circular plates, 3) bleed orifice settings dominate the low speed regime, and 4) shim stack stiffness dominates the high speed regime.
CitationTalbott, M. and Starkey, J., "An Experimentally Validated Physical Model of a High-Performance Mono-Tube Damper," SAE Technical Paper 2002-01-3337, 2002, https://doi.org/10.4271/2002-01-3337.
- Audenino A.L. Belingardi G 1995 “Modelling the Dynamic Behaviour of a Motorcycle Damper,” Proceedings of the Institution of Mechanical Engineers. Part D, Journal of Automobile Engineering 209 4 249 262
- Bergen C. 2000 Ohlins Representative, Personal Conversation Feb. 15 2000
- Dixon J. C. 1999 The Shock Absorber Handbook , SAE Warrendale, PA
- Duym S.W. Stiens R. Baron G.V. Reybrouck K.G. 1997 “Physical Modeling of the Hysteretic Behaviour of Automotive Shock Absorbers,” SAE Paper 970101
- Gillespie Thomas D. 1992 Fundamentals of Vehicle Dynamics, SAE Warrendale, PA
- Herr F. Mallin T. Roth S. 1999 “A Shock Absorber Model Using CFD Analysis and Easy5,” SAE Paper 1999-01-1322
- Hoffman Joe D. 1992 Numerical Methods for Engineers and Scientists, McGraw-Hill New York
- Hoffmann H. J. 1958 “Wirkameseit von Stossdampfern am Fahrzeug,” (Effectiveness of Shock Absorbers on Vehicles) Automobiltechnische Zeitschrift J60 H10
- Lang H. H. 1977 “A Study of the Characteristics of Automotive Hydraulic Dampers at High Stroking Frequencies,” Ph.D. Dissertation The University of Michigan
- Milliken William F. Milliken Douglas L. 1995 Race Car Vehicle Dynamics, SAE Warrendale, PA
- Munson B.R. Okiishi T.H. Young D.F. 1990 Fundamentals of Fluid Mechanics 2nd John Wiley & Sons New York
- Reybrouck K 1994 “A Non Linear Parametric Model of an Automotive Shock Absorber,” Vehicle Suspension System Advancements, SAE Paper 940869
- Roark R.J. Young W. C. 1975 Formulas for Stress and Strain 5th McGraw-Hill New York 324 343
- Segal L. Lang H. H. 1981 “The Mechanics of Automotive Hydraulic Dampers at High Stroking Frequencies,” Vehicle System Dynamics 10 82 85
- Talbott M.S. 2002 “An Experimentally Validated Physical Model of a High-Performance Automotive Damper,” MS Thesis Purdue University
- Ohlins NASCAR Winston Cup Shocks: Racing Workshop Manual 4th 1997