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Appl. Sci. 2017, 7(6), 610;

Vibro-Acoustic Numerical Analysis for the Chain Cover of a Car Engine

Department of Chemical, Materials and Production Engineering University of Naples Federico II, P.le V. Tecchio 80, 80125 Naples, Italy
Fiat Chrysler Automobiles (FCA) Powertrain S.p.A., via ex Aeroporto, 80038 Pomigliano D’Arco, Italy
Author to whom correspondence should be addressed.
Academic Editors: Roberto Citarella and Luigi Federico
Received: 20 January 2017 / Revised: 18 May 2017 / Accepted: 8 June 2017 / Published: 12 June 2017
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In this work, a vibro-acoustic numerical and experimental analysis was carried out for the chain cover of a low powered four-cylinder four-stroke diesel engine, belonging to the FPT (FCA Power Train) family called SDE (Small Diesel Engine). By applying a methodology used in the acoustic optimization of new FPT engine components, firstly a finite element model (FEM) of the engine was defined, then a vibration analysis was performed for the whole engine (modal analysis), and finally a forced response analysis was developed for the only chain cover (separated from the overall engine). The boundary conditions applied to the chain cover were the accelerations experimentally measured by accelerometers located at the points of connection among chain cover, head cover, and crankcase. Subsequently, a boundary element (BE) model of the only chain cover was realized to determine the chain cover noise emission, starting from the previously calculated structural vibrations. The numerical vibro-acoustic outcomes were compared with those experimentally observed, obtaining a good correlation. All the information thus obtained allowed the identification of those critical areas, in terms of noise generation, in which to undertake necessary improvements. View Full-Text
Keywords: vibration analysis; acoustic analysis; FEM; BEM; NVH; modal analysis vibration analysis; acoustic analysis; FEM; BEM; NVH; modal analysis

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Armentani, E.; Sepe, R.; Parente, A.; Pirelli, M. Vibro-Acoustic Numerical Analysis for the Chain Cover of a Car Engine. Appl. Sci. 2017, 7, 610.

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