Analytical results are presented for nonlinear vibrations of a timing belt with parametric excitation in tension and meshing impact forces. Galerkin method is employed to the equation of motion. The steady-state responses are calculated using the harmonic balance method/The numerical results yield the following conclusions. The resonant amplitude increases with the increase of pulley speed for constant tension. In the case of variable tension, the resonant peak value varies with rate of variable tension, and increases with increase of tension. Amplitude reduction by means of periodic variation of tension is effective for tension and rate of variable tension.
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