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Prediction of vibro-acoustic excitation due to timing chains of reciprocating engines

By M Sopouch, W Hellinger and H H Priebsch


Abstract: Timing drive systems of recent passenger car engines are usually equipped with chain or synchronous belt drives. The comparatively low stiffness of chains and belts, combined with the large moments of inertia, resulting from moving parts of camshafts and valvetrains, lead to natural frequencies in the frequency range between 80 and 250Hz for the entire timing drive [1]. Obviously, engine orders dominating the noise excitation are in the same frequency range, and resonance effects cannot be avoided. Furthermore, a guarantee is requested that occurring vibration amplitudes do not exceed acceptable limits. Hence, the predicted results of the primary dynamics of the timing drive are key data for the design analysis of a combustion engine. Besides the low frequency range excitation determined by main engine orders, higher-order structure-borne noise excitation is gaining more importance. This is particularly true for chain-driven systems where specic effects lead to considerable excitation of the engine structure in a higher frequency range (typical whine noise). The excitations are caused by the polygon effect, meshing impacts between chain links and sprockets and impacts in the engagement and disengagement between chain, sprockets and guides. This paper presents a comprehensive multi-body dynamics (MBD) model and the relevant simulation environment, which takes into account the entire timing drive as a fully coupled system. While simple MBD models (e.g. longitudinal span representation) are sufcient for the prediction of the primary dynamics of th

Year: 2016
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