International Journal of Automotive Technology

The Korean Society of Automotive Engineers (한국자동차공학회)
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CFD-FEA ANALYSIS OF HYDRAULIC SHOCK ABSORBER VALVE BEHAVIOR

  • Shams, M. (Mechanical Engineering, Department, K.N.Toosi University of Technology) ;
  • Ebrahimi, R. (Mechanical Engineering, Department, K.N.Toosi University of Technology) ;
  • Raoufi, A. (Mechanical Engineering, Department, K.N.Toosi University of Technology) ;
  • Jafari, B.J. (Research and Development Department, Indamin Saipa Shock Absorber Mfg. Co.)
  • Published : 2007.10.01
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Abstract

In this study, a Coupled Computational Fluid Dynamics(CFD) and Finite Element Analysis(FEA) method are used to predict and evaluate the performance of an automotive shock absorber. Averaged Navier-Stokes equations are solved by the SIMPLE method and the RNG $k-\varepsilon$ is used to model turbulence. CFD analysis is carried out for different intake valve deflections and piston velocities. The force exerted on the valve in each valve deflection is obtained. The valve deflection-force relationship is investigated by the FEA method. The force exerted on the valve in each piston velocity is obtained with a combination of CFD and FEA results. Numerical results are compared with the experimental data and have shown agreement. Dependence of valve deflection as a function of piston velocity is investigated. Effects of hydraulic oil temperature change on valve behavior are also studied.

Keywords

References

  1. Baracat, D. E. (1993). A proposal for mathematical design of shock absorbers. SAE Paper No. 931691
  2. Dixon, J. C. (1999). The Shock Absorber Handbook. SAE R-176. Society of Automotive Engineers. Warrendale, Pa
  3. Duym, S. (2000). Simulation tools, modelling and identification, for an automotive shock absorber in the context of vehicle dynamics. Vehicle System Dynamics 33, 4, 261-289 https://doi.org/10.1076/0042-3114(200004)33:4;1-U;FT261
  4. Duym, S. and Reybrouck, K. (1998). Physical Characterization of nonlinear shock absorber dynamics. European J. Mechanical Engineering 43, 4, 181-188
  5. FLUENT User Guide (1998). Fluent Incorporated, Centerra Resources Park, 10 Cavendish Court, Lebanon, NH 03766
  6. Herr, F., Mallin, T., Lane, J. and Roth, S. (1999). A shock absorber model using CFD analysis and easy 5. SAE Steering and Suspension Technology Symp., Detroit, Michigan, 267-281
  7. Krakov, M. S. (1999). Influence of rheological properties of magnetic fluid on damping ability of magnetic fluid shock absorber. J. Magnetism and Magnetic Materials, 201, 368-371 https://doi.org/10.1016/S0304-8853(99)00100-6
  8. Lee, C. T. and Moon, B. Y. (2005). Study of the simulation model of a displacement-sensitive shock absorber of a vehicle by considering the fluid force. J. Automobile Engineering, 219, 965-975 https://doi.org/10.1243/095440705X34685
  9. Lee, C. T. and Moon, B. Y. (2006). Simulation and experimental validation of vehicle dynamic characteristics for displacement-sensitive shock absorber using fluid-flow modelling, Mechanical Systems and Signal Processing, 20, 373-388 https://doi.org/10.1016/j.ymssp.2004.09.006
  10. Morinaga, H., Kuboto, M. and Kume, H. (1997). Mechanism analysis of shock absorber rattling noise. J. SAE Review 18, 2, 198-198
  11. Purdy, D. J. (2000). Theoretical and experimental investigation into an adjustable automotive damper. Proc. Institution of Mechanical Engineers, Part D, J. Automobile Engineering 214, 3, 265-283 https://doi.org/10.1243/0954407001527411
  12. Reybrouck, K. (1994). A nonlinear parametric model of an automotive shock absorber. SAE Paper No. 9400869
  13. Reybrouck, K. and Duym, S. (1998). A physical and parametric model for nonlinear dynamic and temperature-dependant behaviour of automotive shock absorbers. Proc. 11th ADAMS Users Conf., Frankfurt
  14. Surace, C., Worden, K. and Tomlinson, G. R. (1992). An improved nonlinear model for an automotive shock absorber. Nonlinear Dynamics 3, 6, 413-429
  15. Tallec, P. L. and Mouro, J. (2001). Fluid structure interaction with large structural displacements. Computer Methods in Applied Mechanics and Engineering, 190, 3039-3067 https://doi.org/10.1016/S0045-7825(00)00381-9
  16. Yakhot, V. and Orszag, S. A. (1986). Renormalization group analysis of turbulence I; Basic Theory. J. Sci. Comput., 1, 1-51 https://doi.org/10.1007/BF01061451