Abstract
In order to predict the interior noise of the automobile in the low and middle frequency band in the design and development stage, the hybrid FE-SEA model of an automobile was created using hybrid FE-SEA method. The modal density was calculated using analytical method and finite element method; the damping loss factors of the structural and acoustic cavity subsystems were also calculated with analytical method; the coupling loss factors between structure and structure, structure and acoustic cavity were both calculated. Four different kinds of excitations including road excitations, engine mount excitations, sound radiation excitations of the engine, and wind excitations are exerted on the body of automobile when the automobile is running on the road. All the excitations were calculated using virtual prototype technology, computational fluid dynamics (CFD), and experiments realized in the design and development stage. The interior noise of the automobile was predicted and verified at speed of 120 km/h. The predicted and tested overall SPLs of the interior noise were 73.79 and 74.44 dB(A) respectively. The comparison results also show that the prediction precision is satisfied, and the effectiveness and reliability of the hybrid FE-SEA model of the automobile is verified.
Highlights
Statistical Energy Analysis SEA method is widely used by many automobile industries and institutes to model automotive vibroacoustic system at high frequencies 1–4
In order to deal with low and middle frequencies, a hybrid modeling method including finite element and statistical energy analysis Hybrid FE-SEA is used to develop the vibroacoustic model of the automobile system 5–9
According to the nodes and elements of the FE model, the FE subsystems were created in the hybrid FE-SEA model, such as shock tower and longitudinal beams
Summary
Statistical Energy Analysis SEA method is widely used by many automobile industries and institutes to model automotive vibroacoustic system at high frequencies 1–4. In order to deal with low and middle frequencies, a hybrid modeling method including finite element and statistical energy analysis Hybrid FE-SEA is used to develop the vibroacoustic model of the automobile system 5–9. Charpentier et al predicted the structure-borne noise transmission in a trimmed automotive vehicle He improved the design for interior noise using a hybrid FE-SEA model of a trimmed vehicle. It is not the normal prediction with some experiments, but the interior noise was predicted at the development and design stage of the automobile It is based on the prediction of the parameters and excitations. The parameters include modal density, damping loss factor, and coupling loss factor, and the excitations incorporate sound excitation of engine cabin, excitation of engine mounts, excitation of road roughness, and wind excitations
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