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Although the crankshaft pulley looks like a conventional pulley it has its merits. An internal combustion engine is not a constant speed machine; the movement comes from a series of pulses of power generated by the pistons. These indicate that whenever combustion occurs in the power stroke of one of cylinders, the crankshaft is accelerated by an instant, then slows down to compress the cylinder charge which remains in the firing order and effect of the resistance of the automobile until an instant later it receives acceleration work of the other cylinder.



After leaving the force acting piston, crankshaft material tends to return to its normal position without bending (upright), as does a spring when the load is removed, but like the latter, it does so as an elastic member, i.e. oscillating at the natural frequency without damping just around the equilibrium position. While in the state of oscillation, and most likely before retrieving the equilibrium position, it receives another loading cycle from another piston and again starts the oscillation.


The natural frequency of oscillation of elastic damper has to be very far from coinciding with the vibration frequency of the crankshaft to avoid at all costs the resonance in the system in seconds that would ruin the integrity of the damper itself.

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