We analyzed the timing belt tension fluctuation of a V-6 engine and found that nonlinear resonance, which is not present in in-line engines, existed. In the study of thin phenomenon, we analyzed, through simulation, exactly how the belt tension fluctuated. This resulted in computed reproduction of subharmonic resonance, a kind of nonlinear resonance. In this paper, the generation mechanism of subharmonic resonance due to the tension in a V-6 engine belt is simulated, the belt spring which causes the subharmonic resonance is analyzed, and some cases of nonlinear resonance are presented.
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