The work developed in this paper addresses four issues that were not addressed in previous work. This is the first paper to consider the nonlinear geometric effects of the suspension, derive the coil-spring suspension model from physical principles, and compare theoretical and experimental results. A high fidelity seat suspension model, which can be used for ride quality predictions, is developed in this work. The coil- spring seat's suspension model includes unique nonlinear forms for the stiffness and damping characteristics. The nonlinear geometry inherent in the seat suspension was modeled; the geometry was not assumed to be one-dimensional, vertical motion. The nonlinear stiffness characteristics of the suspension were developed without assuming linear stiffness or using nonlinear stiffness terms developed without regard for the mechanism from which they arose. The model developed in the present work is based on physical mechanisms and not solely empirical observations. Finally, the dependency of friction on the suspension deflection was shown to arise from the nonlinear geometry; friction is not considered to be independent of suspension deflection apriori. The major contribution of this work is a model that addresses the nonlinear geometry, stiffness, and friction issues inherent in coil-spring seat suspensions. The accuracy of the model was demonstrated with an example and the applications and assumptions were discussed. Ultimately, this model can become an analytical tool during the design of the seat. Use of this model allows the seat to be tailored to the specific vehicle for which it is intended. The seat is then an integral component of the early vehicle design, when changes can be made without costly prototyping changes. As more design tools for components become available, less vehicle prototyping will be required, reducing design and development time, reducing cost, and improving quality.


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    Title :

    Automotive seat suspension model for ride quality studies


    Additional title:

    Modell einer Sitzfederung für Automobile für Studien zur Fahrqualität


    Contributors:
    Ferris, J.B. (author) / Estes, H.A. (author)


    Publication date :

    2002


    Size :

    5 Seiten, 7 Bilder, 1 Tabelle




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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