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Significance of non-linearity and component-internal vibrations in an exhaust system
Responsible organisation
2002 (English)Conference paper, (Refereed) Published
Abstract [en]

To facilitate overall lay-out optimisation inexpensive dynamics simulation of automobile exhaust systems is desired. Identification of possible non-linearity as well as finding simplified component models is then important. A flexible joint is used between the manifold and the catalyst to allow for the motion of the engine and to reduce the transmission of vibrations to the rest of the exhaust system. This joint is significantly non-linear due to internal friction, which makes some kind of non-linear analysis necessary for the complete exhaust system. To investigate the significance of non-linearity and internal vibrations of other components a theoretical and experimental modal analysis of the part of a typical exhaust system that is downstream the flexible joint is performed. It is shown that non-linearity in this part is negligible. It is also shown that shell vibrations of the catalyst and mufflers as well as ovalling of the pipes are negligible in the frequency interval of interest. The results implies, for further dynamics studies, that the complete system could be idealised into a linear sub-system that is excited via the non-linear flexible joint, that the pipes could be modelled with beam elements and that the other components within the linear sub-system could also be modelled in a simplified way. Such simplified component models are suggested. The agreement between theoretical and experimental results is very good, which indicates the validity of the simplified modelling.

Place, publisher, year, edition, pages
Skiathos: WSEAS , 2002.
Keyword [en]
Correlation, Dynamics, Exhaust system, Linear sub-system, Modal
National Category
Applied Mechanics
Identifiers
URN: urn:nbn:se:bth-9389Local ID: oai:bth.se:forskinfoEFBAE7D79C40EBD7C125707B002A76F0OAI: oai:DiVA.org:bth-9389DiVA: diva2:837224
Conference
The 2nd WSEAS International Conference on simulation, modelling and optimization
Available from: 2012-09-18 Created: 2005-09-13 Last updated: 2015-06-30Bibliographically approved

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Wall, JohanBroman, Göran
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Citation style
  • apa
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  • de-DE
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Output format
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