Abstract
An unstructured zero-order energy finite element method (uEFEM 0 ) formulation is presented to simulate the high-frequency behavior of plate structures in contact with acoustic enclosures, which is can be seen as a typical simplification of cars. In this formulation, the vibration energy of all the bending, longitudinal and shear wave fields in the plates and sound press level in the acoustic enclosure can be obtained. This uEFEM 0 formulation is validated by comparing the results with those from Statistical Energy Analysis (SEA). Good correlations are observed and the potential effort of the uEFEM 0 as a NVH tool in car industry is identified.
Highlights
Noise, vibration, and harshness (NVH), is the study and modification of the noise and vibration characteristics of vehicles, cars and trucks
A part of vibrational energy is transferred from the source due to the structural vibration, which is usually predominately low-frequency, the finite element method (FEM) and boundary element method (BEM) are rational choices
A variation of energy density can be determined it is efficient to find out the peaks of structural vibration energy level or sound pressure level (SPL), which would be fruitful results in a NVH analysis
Summary
Vibration, and harshness (NVH), is the study and modification of the noise and vibration characteristics of vehicles, cars and trucks. A part of vibrational energy is transferred from the source due to the structural vibration, which is usually predominately low-frequency, the finite element method (FEM) and boundary element method (BEM) are rational choices. Another part of energy is transferred by the acoustic media, and it is recognized as noise. In order to overcome this disadvantage, Nefske and Sung(2) applied Energy Flow Analysis (EFA) on high-frequency vibration in beam, and developed the Energy FEM (EFEM), in which the primary variable is the time- and space- averaged energy density. A numerical examples is given to verify the new formulation
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