In the Energy Finite element Analysis (EFEA) method, the governing differential equations are formulated for an energy variable that has been spatially averaged over a wavelength and time averaged over a period. A finite element approach is used for solving the differential equations numerically. Therefore, a library of elements is necessary for modeling the various wave bearing domains that are present in a structural-acoustic system. Discontinuities between wave bearing domains always exist due to the geometry, from a change in material properties, from multiple components being connected together, or from different media interfacing with each other. Therefore, a library of joints is also necessary for modeling the various types of physical connections which can be encountered in a structural-acoustic system.In this paper, a new joint formulation is presented for using incompatible meshes in EFEA models, when shapes and/or sizes of elements at structural-acoustic interfaces do not match. The algorithm which identifies automatically the joints in a finite element model is presented, and the implementation of the joints in the EFEA solver is discussed. The new developments are tested by comparing results generated using incompatible models for a simple configuration, and through comparison to test data for a representative automotive air-borne noise application.


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    Title :

    Structural-Acoustic Joints for Incompatible Models in the Energy Finite Element Analysis


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    SAE 2015 Noise and Vibration Conference and Exhibition ; 2015



    Publication date :

    2015-06-15




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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