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The chain link and sprocket tooth impact during a meshing has been identified as the most significant noise source in a chain drive system. This paper first presents the theoretical derivation of the chain drive natural frequencies and mode shapes using the equations of motion from a stationary undamped chain drive system. The theoretical derivation shows the existence of three types of chain resonances, namely the transverse strand resonance, the longitudinal chain sprocket coupled resonance and the longitudinal chain stress wave type resonance. The chain-sprocket meshing noise is amplified when the chain sprocket meshing frequency corresponds to any one of the above mentioned chain drive system resonances. These theoretical results are then validated by a chain drive system CAE model using ABAQUS to identify the chain drive system resonances.

In this paper we describe the development and application of a CAE methodology to investigate stresses incurred in the torque converter anti-rattle spring subjected to various static and dynamic loading conditions. The objectives of this study are three-fold. First, develop and demonstrate a dynamic modeling methodology suitable for torque converter rattle analysis. Second, provide insight into the underlying physics in the hardware design and identify key parameters to achieve high-mileage improvement, and third, recommend feasible design and manufacturing parameters for design improvements. Anti-rattle springs have been widely used in torque converter clutch to reduce rattle noise between the spline interface of the cover plate and the piston plate. They are constantly subjected to static and dynamic stresses under various vehicle operation conditions.