Application of Nondimensional Dynamic Influence Function Method for Eigenmode Analysis of Two-Dimensional Acoustic Cavities
نویسندگان
چکیده
This paper establishes an improved NDIF method for the eigenvalue extraction of two-dimensional acoustic cavities with arbitrary shapes. The NDIF method, which was introduced by the authors in 1999, gives highly accurate eigenvalues despite employing a small number of nodes. However, it needs the inefficient procedure of calculating the singularity of a systemmatrix in the frequency range of interest for extracting eigenvalues andmode shapes.The paper proposes a practical approach for overcoming the inefficient procedure bymaking the final systemmatrix equation of theNDIFmethod into a formof algebraic eigenvalue problem.The solution quality of the proposed method is investigated by obtaining the eigenvalues and mode shapes of a circular, a rectangular, and an arbitrarily shaped cavity.
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