When the finite element model of a complex structure is partitioned into substructures in order to enable component mode synthesis, the reduced order model obtained from the Craig-Bampton method often features a large number of interface degrees of freedom (DOF). The authors have recently developed a method to reduce the interface DOF by using a set of so-called characteristic constraint (CC) modes. The resultant, highly compact CC-mode-based reduced order model provides a good platform to calculate the power flow between substructures. In this paper, the CC-mode method is applied to the finite element model of a vehicle structure with about 1.5 million DOF. A convergence study is conducted to find optimal mode selection criteria, and a 2124 DOF reduced order model is obtained for the 0-200 Hz range by using the CC-mode method. Then, a forced response analysis is carried out to verify its accuracy for capturing dynamic response, and a power flow analysis is carried out to demonstrate its capability for identifying critical power flow paths. A novel presentation method is adopted to display power flow through the vehicle structure as a two-dimensional “map”. From the power flow maps, the structural paths through which the vibration energy is transmitted from the source to the key response points are clearly illustrated.


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    Title :

    Vibration and Power Flow Analysis of a Vehicle Structure Using Characteristic Constraint Modes


    Additional title:

    Sae Technical Papers



    Conference:

    SAE 2003 Noise & Vibration Conference and Exhibition ; 2003



    Publication date :

    2003-05-05




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English


    Keywords :


    Vibration and Power Flow Analysis of a Vehicle Structure Using Characteristic Constraint Modes

    Zhang, G. / Castanier, M. P. / Pierre, C. et al. | British Library Conference Proceedings | 2003


    Vibration and power flow analysis of a vehicle structure using characteristic constraint modes

    Zhang,G. / Castanier,M.P. / Pierre,C. et al. | Automotive engineering | 2003


    Power Flow Analysis of Complex Structures Using Characteristic Constraint Modes

    Yung-Chang Tan / Matthew Castanier / Christophe Pierre | AIAA | 2005



    Characteristic Constraint Modes for Component Mode Synthesis

    Matthew P. Castanier / Yung-Chang Tan / Christophe Pierre | AIAA | 2001