Acoustic-Structural Study for the Cabin of an Automotive Vehicle

Abstract

AN ACOUSTIC-STRUCTURAL STUDY OF A CABIN FOR AN AUTOMOTIVE VEHICLE THROUGH A NEW 3D FINITE ELEMENT MODEL IS PRESENTED. THIS MODEL, WHICH IS DEVELOPED WITH SOFTWARE ANSYS, HAS A SIMPLE GEOMETRICAL CONFIGURATION TO PROVIDE THE UNCOUPLED AND COUPLED ACOUSTIC-STRUCTURAL MODES OF THE CABIN WITH COMPUTING MINIMUM TIME. IN ADDITION, THE MODEL EASILY OBTAINS THE RESULTS OF INTERIOR SOUND PRESSURE AND STRESS IN THE CABIN CAUSED BY A HARMONIC EXCITATION. THE RESULTS OF THE FIRST COUPLED-SYSTEM MODES ARE OF RIGID TYPE AND THEY HAVE FREQUENCIES SMALLER THAN 5 HZ. HOWEVER, THE MAIN ACOUSTIC MODES ARE PRESENT FOR FREQUENCIES GREATER THAN 87 HZ, WITH THE EXCEPTION OF HELMHOLTZ MODE (0 HZ). THE HIGHEST ACOUSTIC PRESSURE (IN THE RANGE FROM 2 TO 400 HZ) IS 107.8 DB FOR A HARMONIC EXCITATION OF 1 N. THE STRUCTURE OF THE CABIN REGISTERS A MAXIMUM STRESS OF 1.85 MPA TO 51 HZ. THE MODEL PROPOSED SIGNIFICANTLY CONTRIBUTES IN THE EVALUATION OF NOISE LEVEL AND STRESS FOR AN AUTOMOTIVE VEHICLE.