Interior acoustics of a truck cabin with hard and impedance surfaces

Abstract Interior acoustics of a truck cabin is determined and the consequences of an attempt, which was performed with acoustic linings in order to improve the interior comfort, are presented. Acoustic field generated from the harmonic vibrations of the cabin floor panel was expressed by the Helmholtz integral equations. Numerical results were obtained by a computer code which was developed in Visual Basic programming language in order to solve the integral equations by using boundary element method. The effects of the linings on the levels and distributions of the sound pressure in the cabin are presented by means of the comparison of the results calculated from two different boundary conditions: hard wall and impedance wall.