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Physics-based model of a stroke-dependent shock absorber

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Abstract

Multibody system simulation has become a mature analysis tool as part of industrial suspension design processes. However, when applied to a specific problem, it turns out that not kinematics or elasto-kinematics is the major issue, but force elements like shock absorbers. Classical linear or nonlinear characteristics are no longer applicable to modern stroke- or frequency-dependent shock absorbers, especially regarding transient, non-stationary analyses. Therefore, more emphasis has to be put on understanding and modeling this kind of elements. The paper will show a systematic modeling and identification process for a stroke-dependent, single tube shock absorber starting from basic physics laws for gas dynamics and hydraulics. Valve characteristics being the determining element of damper performance are modeled by rather flexible Hermite splines which are identified on a test rig in a two-step procedure. Simulations of VDA (Association of German Automotive Industry) tests and randomly excited vibrations of the identified damper model show high agreement with experimental results, and thus the high potential of the proposed modeling approach.

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Authors and Affiliations

  1. Engineering Mechanics and Vehicle Dynamics, Brandenburg University of Technology Cottbus, Siemens-Halske-Ring 14, 03046, Cottbus, Germany

    Torsten Funke & Dieter Bestle

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  1. Torsten Funke
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  2. Dieter Bestle
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Correspondence to Torsten Funke.

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Funke, T., Bestle, D. Physics-based model of a stroke-dependent shock absorber. Multibody Syst Dyn 30, 221–232 (2013). https://doi.org/10.1007/s11044-013-9348-9

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  • DOI: https://doi.org/10.1007/s11044-013-9348-9

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