Abstract
Abstract
A novel design of a vibration absorber used in reducing the torsional vibration of a crankshaft is proposed. When a crankshaft is rotating, its natural frequency corresponding to the first torsional mode varies due to the inertia force. The proposed vibration absorber is installed inside the cavity of the front pulley and rotates with the crankshaft. Therefore its natural frequency also varies with the rotating speed. The objective is to design a vibration absorber whose torsional natural frequency not only varies with the rotating speed but also coincides with the varying natural frequency of the rotating crankshaft. Thus it can effectively suppress the torsional vibration of the crankshaft when a vehicle cruises at a varying speed. Results from numerical simulations using the finite element method show that the torsional vibration of the crankshaft can be reduced by more than 45 dB.
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