ABSTRACT
One of the most valuable criteria for vehicle quality assessment is based on acoustic emission levels. Unstable exhaust gas at high temperature flowing from internal combustion engine manifold may cause noise and disturbance conflicting with the high standard of acoustic comfort requested by this kind of vehicle. This research was involved in carrying out flow simulation model and analysis on an exhaust system design, and based on virtual data output from CFD tools and AVL-Boost software aiming at identifying the natural frequencies and mode shapes of its structural components, to ensure that external excitation sources do not lead to resonances. The objective of this study was to analyze the dynamic behaviour and to identify the overall characteristics of the exhaust gas, so that components sensitive to induced turbulent vortices may be identified and assessed relative to acceptance criteria for acoustic levels requested by technical specification.
