Powertrain systems, such as in vehicles and ships, can be modelled as torsional elastic systems. These models are used by design engineers for investigating and refining vibration inherent in the powertrain. The powertrain components, engine, gearing, couplings, clutches, etc., can be complex to model. Basic models start with linear-lumped spring-mass systems of equations of motion and improve with additional detail for the dynamics of various components. The finite element method is a useful tool for torsional vibration analysis, particularly for powertrain systems. Once an understanding of the dynamic system is gained and a lumped mass model devised then the general finite elements, direct, geared, branched and grounded, can be assigned. In some situations custom elements can be developed to handle added system complexities, such as for single or multi-stage planetary gear sets and toroid-roller contact. Using a global coordinate vector, the finite elements for inertia, stiffness and damping and their corresponding local coordinate vectors can be assembled into the equations of motion for the global system. For systems that change state often, such as transmissions with clutch shifting, global assemblies can be quickly made that govern each state. Once the global system has been assembled the equations of motion can be used for the various investigations. Free vibration analysis, with the torque vector set to zero, and the wheels either grounded or linked to the vehicle mass. Gear ratios are fixed or in the case of the system with the gear set element the clutch connections and held gear set components fix the gear ratio. Forced vibration analysis, analytical or numerical; analytical for fixed gear states and input torques that can be handled analytically, such as harmonic or stepped, numerical for the parametric condition of gear ratio change, for input torques from mapped data such as engine torque and other nonlinearities such as stick-slip, clutch judder and gear backlash.


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    Titel :

    Torsional finite elements and nonlinear numerical modelling in vehicle powertrain dynamics


    Weitere Titelangaben:

    Finite Elemente für Torsionslasten und nichtlineare numerische Modellierung der Dynamik von Fahrzeugkraftübertragungen


    Beteiligte:
    Crowther, A.R. (Autor:in) / Zhang, N. (Autor:in)

    Erschienen in:

    Journal of Sound and Vibration ; 284 , 3-5 ; 825-849


    Erscheinungsdatum :

    2005


    Format / Umfang :

    25 Seiten, 15 Bilder, 4 Tabellen, 21 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch





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