A computer-aided-engineering (CAE) method is used for noise reduction in a truck cab interior. The FEM (finite element method) and the BEM (boundary element method) are used to characterize the acoustic field of a truck cab interior in terms of the natural frequencies and the mode shapes. Structural vibration responses of the cab are computed for excitations at the cab mounts in a frequency range from 50 Hz to 250 Hz. Interior noise levels at the driver's right ear are determined using the BEM for excitations at the cab mounts. A PACA (panel acoustic contribution analysis) is done to determine the structural areas of the cab contributing most to the noise levels at the driver's right ear. Structure-borne noise is reduced in the interior of the cab by selection and placement of sound absorbing material at the appropriate locations in the cab, as determined by PACA.
Structure-borne noise reduction in a truck cab interior using numerical techniques
Körperschalldämpfungsanalysen in der Innenkabine eines LKW mit numerischen Techniken
Applied Acoustics ; 59 , 1 ; 1-17
1999
17 Seiten, 13 Bilder, 11 Quellen
Article (Journal)
English
Lkw (Lastkraftwagen) , Innenraum , Geräuschemission , Lärmminderung , Lärmexposition , numerische Simulation , Finite-Elemente-Methode , Rand-Elemente-Methode , Schallfeld , Eigenfrequenz , Modalparameter , Schwingungsanregung , Lautstärke , Frequenzbereich , Körperschall , Schalldämmstoff , Materialauswahl
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