Vibro-acoustic analysis and optimization of an engine clutch cover

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Vibro-acoustic analysis and optimization of an engine clutch cover

Badalassi, P. / Carmignani, C. / Forte, P. / Vaccarino, P.

Dynamic excitation from the engine generates vibration modes in the engine thin clutch cover, which causes radiation of unwanted structure-borne noise. To reduce the noise as well as the vibration, the stiffened plate construction is frequently used for thin covers, where the rib stiffener layout is the key of the classical design. This paper presents the evaluations and comparison of sound power level radiated from an engine clutch cover actually mounted on a mass production motorcycle and a new optimized clutch cover. Firstly the acoustical analysis considers the variation of material, the uniform thickness distribution for the clutch cover, and then compares the effects of ribs and concentrated masses applied on the inner cover surface. The clutch cover is excited by a set of harmonic forces applied to the inner surface; a commercially available finite element software is used to predict the mode shapes of the cover while the radiated sound power is predicted using and comparing a conventional boundary element method and a novel approach, the modal acoustic transfer vector method.