Finite Element modelling of elastomeric sealing components for cylinder-head cover noise and vibration prediction. (6th May 2009)

• Record Type: Journal Article
• Authors: Nash, David A.; Lu, Y. Charles; Anderson, Michael E.
• Is Part Of: International journal of vehicle design. Volume 49:Number 4(2009)
• Page Start: 287
• Page End: 302
• Publication Date: 2009-05-06
• Subjects: FEM -- finite element method -- elastomers -- elastomeric sealing -- viscoelastic gaskets -- noise prediction -- vibration prediction -- vehicle design -- modelling -- cylinder heads -- cover assembly; Motor vehicles -- Design and construction -- Periodicals; 629.231
• Languages: English
• ISSNs: 0143-3369

Abstract

Finite Element (FE) modelling has been used extensively in designing automotive engines and subsystems for evaluating their noise and vibration performance. However, the elastomeric components at the interfaces are often omitted in the FE models owing to the lack of 'effective' elements. The present paper presents a methodology to model the elastomeric sealing components using viscoelastic gasket elements. A cylinder-head cover assembly is analysed because it is a known major contributor to radiated engine noise. First, detailed local FE analyses were performed on an elastomeric gasket and grommet to capture their non-linear load-deflection and contact interferences. Secondly, a global FE model of the cover assembly was constructed where the gasket and grommet were re-modelled with viscoelastic gasket elements. The forced response dynamic analysis was performed to calculate the transmissibility of the cover assembly. The overall approach is applicable to the modelling of elastomeric components in similar structures or engines.