A key parameter for frequency or modal separation of the powertrain is the basic mount design. For East-West engine configurations, there are two fundamental arrangements of mounts: the CG and pendulum arrangements. This paper discusses the variability of the modal separation of the powertrain rigid body modes as a function of the variability of the mount geometry and property parameters as well as sub-frame mount stiffness values. Six and 12 Degrees of Freedom (DOF) models are used in the analysis. Detailed Design of Experiment (DOE) studies are conducted. The general assumption of 30 % variation in rubber sub-frame mount stiffness parameters will yield violations of the criteria used for mount strategy. The geometry variation of 10 mm (5 mm) does not yield significant variation on modal decoupling strategy. Variation of 40 mm does yield gross violation of design criteria. The property variation of 10 % has a gross effect on modal decoupling strategy of the powertrain. This property variation happens between CAE and Test data. It is recommended to have/implement tighter control of the property parameters in the vehicle. Also, we recommend the design of sub-frame mount with a strategy that considers the frequency separation of the sub-frame modes. The impact of these variations on customer level NVH is left for future work.


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    Title :

    Robustness of mount systems for idle NVH, Part I: Centre of Gravity (CG) mounts


    Additional title:

    Robustheit einer Motoraufhängung für NVH im Leerlauf, Teil I: Schwerpunktbefestigung


    Contributors:


    Publication date :

    2006


    Size :

    17 Seiten, 3 Bilder, 9 Tabellen, 18 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




    Robustness of mount systems for idle NVH, part I: centre of gravity ( CG ) mounts

    Sirafi,M. / Chanh,Y.P. / Qatu,M.S. et al. | Automotive engineering | 2006


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    Sirafi,M. / Chanh,Y.P. / Qatu,M.S. et al. | Automotive engineering | 2006


    Robustness of mount systems for idle NVH, Part II: pendulum mounts

    Sirafi, Mohammad / Chang, Yin-Ping / Qatu, Mohamad S. | Tema Archive | 2006



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