F2010C036
Study of Chain Meshing Noise by Multi Body Dynamics Simulation
Mechanism of meshing noise of silent chain is discussed by multi body dynamics simulation. To predict chain meshing noise by multi body dynamics simulation, it needs to be specified that which behavior of chain system should be predicted. In pre-testing, in order to remove the influence of other components as much as possible, piston and cam drive chain were removed and only the simple system of only crank and balancer system were left. The meshing noise and the behavior of chain system were measured at the same time, and the behavior with high correlation to meshing noise was specified. And the behavior was predicted by multi body dynamics simulation. In multi body dynamics simulation, the link by link model that each chain link plate shape and each sprocket shape are modeled is used to explain silent chain meshing. Because meshing noise is much influenced by the shape of chain link plate and chain sprocket, the detailed shape of them are measured and used in simulation models. The correlation of measured result and predicted result by link by link model modified in this study was verified. As a result, it was verified that the multi body dynamics simulation with link by link model could predict the same change tendency as measured chain meshing noise, with the sufficient accuracy. Next, the mechanism of chain meshing noise and the factor that influences greatly to meshing noise were discussed, and the effect of the factor to chain meshing noise was predicted by link by link model when the factor was changed. It was assumed that the chain meshing noise is generated by forced displacement excitation of the chordal action of the sprocket, and the influence of the factor assumed to influence chordal action greatly was predicted. As a result, it was predicted that the influence of the assumed factor is great, and the mechanism of chain meshing noise and the factor that influences greatly to chain meshing noise were demonstrated.
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Session: Noise and Vibration Reduction