In the present study the FEM-BEM method is adopted to study the mini-bus structure-borne noise. An analysis method and flow chart for structure-borne noise reduction by controlling the body panel vibration is proposed and verified by tests. The research work and conclusions are as follows. 1. The FE of the BIW is modelled and the body structure modes are calculated. The correlation analysis between the FE and the test results shows that the relative errors of the frequency of the FE model and the test model are small and that the modal shapes of the FE model and the test model agree well, which has proved the reliability of the FE model. 2. The acoustic boundary element model with seats is constructed. The location of the DRE is set to the field point, and the ATV in the frequency range 20-200 Hz is calculated using LMS software. 3. The matrix inversion method is used to estimate the powertrain and the exhaust pipe operational forces at idle. Then the forces are input into the acoustic BEM to calculate the body panel velocity. By combining the ATV and the body panel velocity, the interior acoustic response can be obtained. Comparison between the simulation and test results indicates that the main peak frequencies are more consistent with the same trend. 4. The BE model of the cab is split into 22 panels and a PACA is made on the basis of the formulae. The PACA results indicate the panels that mainly contribute to the peak values of the SPL. By imposing a constrained damping treatment on the right_rear side wall, the panel vibration and the interior SPL are obviously reduced, which further verifies the correctness of the PACA conclusions. The analysis method of structure-borne noise reduction is studied and the test results show that the interior SPLs are reduced significantly. Therefore this analysis method and flow chart are expected to help automotive sound engineers to reduce interior structure-borne noise.
Interior structure-borne noise reduction by controlling the automotive body panel vibration
2012
14 Seiten, 16 Bilder, 6 Tabellen, 14 Quellen
Aufsatz (Zeitschrift)
Englisch
Personenkraftwagen , Fahrzeugraum , Innengeräusch , Karosserie , mechanische Schwingung , numerische Modellierung , Finite-Elemente-Methode , Rand-Elemente-Methode , Körperschall , Rauschunterdrückung , Matrixmethode , Inversion , Antriebsstrang , Abgasrohr , Leerlauf , Schwingungsverhalten , Übertragungsverhalten , Körperschalldämpfung
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