A new nonlinear model for elastomer mounts and bushings has been developed that solves the conflicting criteria of model performance and flexibility on the one side and user-friendliness, computing time and stability on the other side. Research on this field is extensive but available models in MBS environment are often only linear model approaches that do not take into account the amplitude dependence due to the Payne effect [1]. On the other hand, some nonlinear models may map amplitude dependence well and show good performance under sinusoidal excitation; but research uncovered unexpected behaviour for time domain simulation of transient or superimposed sinusoidal excitation after implementation within MBS software environment. The investigation showed that this is due to numerical issues and principle model simplifications which are necessary for the implementation into MBS software. Therefore, the model code has been manually reprogrammed and changed to ideally fit the needs of the MBS software environment like MSC. Adams. For frequency domain analysis the new model can be switched to a simplified version (linearization) which calculates frequency dependence very well but cannot match the amplitude dependent characteristics. Similar linear models are available in some MBS applications but investigations showed that automatic linearization is often not carried out correctly and results in the time domain are different from frequency domain analyses. Therefore, such models can only be used for time domain simulation whereas for frequency domain analysis a simple spring damper model is used. A linearized form of the new bushing model and its parameter identification are described in this paper; it leads to identical results in the time domain as well as in frequency domain analyses around the used operating point. In order to improve flexibility and user-friendliness the user can choose between a complex nonlinear model including coupling of directions as well as amplitude dependence or any possible simplification e.g. for linearization. The purpose of such a model is not to exactly describe given physical dependencies but rather to estimate the transient behaviour from a given (or expected or required) frequency response. In this paper the full nonlinear bushing model is described briefly. The model performance is validated and a concept for practical linearization is discussed with an example of the simplified linear model version. Using the given equations, this linear form of the model can be implemented into any MBS environment which is more accurate than a simple spring-damper model and can also be used for frequency domain analyses.


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    Titel :

    New Nonlinear Bushing Model for Ride Comfort and Handling Simulation: Focussing on Linearization and the Implementation into MBS Environment


    Beteiligte:


    Erscheinungsdatum :

    2012


    Format / Umfang :

    13 Seiten





    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch