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Abstract

This paper deals with comparisons of computing efficiency of 20 damper models with functional and hybrid approaches, which can be used to solve typical problems in vehicle dynamics. Efficiency is evaluated based on model accuracy and computing time. The computed results of different damper models are compared to measurements of an actual car damper. Its damping characteristics were measured on a hydraulic damper test rig with three different excitations.

modelling and experimental characterization of hydraulic dampers: effects of shim stack and orifice parameters on damper performance , Nonlinear Dynamics. 67.2, 2012, 1437–1456. [5] Ferdek U., Łuczko J., Modelling and analysis of a twin-tube hydraulic shock absorber , Journal of Theoretical and Applied Mechanics. 50.2, 2012, 627–638. [6] Ferdek U., Łuczko J., Performance comparison of active and semi-active SMC and LQR regulators in a quarter-car model , Journal of Theoretical and Applied Mechanics. 53.4, 2015, 811–822. [7] Ferdek U., Łuczko J., Vibration analysis of a

Abstract

The control systems for the objects of industry, power generation, transport, etc. are extremely complicated; functional efficiency of these systems determines to a great extent the safe and non-polluting operation as well as convenience of service and repair of such objects. The authors consider the possibility to improve the efficiency of systems for damping oscillations in transport using a combination of electrical (generators of rotational and linear types) and hydraulic means. Better efficiency of functioning is achieved through automatic control over the operational conditions of such a system in order to make it adaptive to variations in the road profile and ambient temperature; besides, it is possible to produce additional electric energy.

functionality for specific ride and handling requirements , Czasopismo Techniczne, 6-M/2008, 39–47. [5] Eickhoff M., Sonnenburg R., Stretz A., Piston rod vibrations in damper modules – causes and remedies , ATZ, Vol. 112, 2010, 24–29. [6] Farjoud A., Ahmadian M., Craft M., Burke W., Nonlinear modeling and experimental characterization of hydraulic dampers: effects of shim stack and orifice parameters on damper performance , Nonlinear Dynamics, Vol. 67, Issue 2, January 2012, 1437–1456. [7] Ferdek U., Łuczko J., Modeling and analysis of a twin-tube hydraulic shock absorber

Abstract

This article deals with computer analyses of output quantities of a railway vehicle depending on changing of parameters of suspension system. A passenger car was chosen for dynamic analyses. An analysed passenger railway vehicle uses two stage suspension system composed of coil springs and hydraulic dampers. Stiffness of coil springs of primary and secondary suspensions were defined for two states and its influence on output values in terms of quality and quantity was evaluated. As output variables, values of forces in a wheel/rail contact and accelerations in several locations on a wagon body floor were chosen. Values of forces in a wheel/rail contact indicate dynamic response of a railway vehicle running in terms of running safety and values of accelerations serve as important input for evaluation of passenger ride comfort.

University. 8. Farjoud A., Ahmadian M., Craft M., Burke W. (2012), Nonlinear modeling and experimental characterization of hydraulic dampers: effects of shim stack and orifice parameters on damper performance , Nonlinear Dynamics, 67 1437–1456 9. Frahm H. (1911) Device for damping vibration of bodies , patent US989958A. 10. Gehrlich T., Horn G., Keller H.H., Schilling G., Lange D., Wagner E. (1992), Vehicle suspension, patent GB2258903. 11. Kohlmeier H.H. (1992), Vibration absorber, patent EP0531766. 12. Kruse A. (2002) Characterizing and reducing