Nowadays for the simulation based acoustic design and analysis of intake and exhaust systems mainly 1D-CFD-simulations in time domain are used. Therefore needed acoustic models of the individual components of the intake and exhaust system are mainly derived from performance models, which are used to design the charge changing systems towards performance, fuel consumption and emissions. These adapted performance models show limitations for the acoustic analysis of intake and exhaust systems and often lead to a results quality of the predicted orifice noise, which is not sufficient enough. Whereas efficient linear modelling approaches for intake and exhaust components in frequency domain, which are coupled to each other via an acoustic network allow performing parametric studies in a much faster way compared to available time domain approaches. The used component models, which were especially developed for the acoustic analysis of intake and exhaust systems allow to predict the transfer behaviour up to about 1,5 kHz in a more precise way. An especially developed acoustic turbocharger model allows to calculate the passive acoustic behaviour of turbochargers including single and multi-turbo systems with fixed or variable turbine geometry. In addition the simulation approach allows to make simulation results immediately audible perceptible. The engineer has thereby an additional important support feature for the evaluation of modelling changes. Further it is possible to integrate measurement results of available hardware components into the simulation environment. This allows to analyse efficiently complex subcomponents in the full system context.
Simulation based acoustic design and analysis of intake and exhaust systems
2014
8 Seiten, Bilder, 10 Quellen
Aufsatz (Konferenz)
Englisch
FEM Acoustic Simulation of Intake and Exhaust Systems (924010)
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