
THE RECIPROCATING PISTON PETROL ENGINE 39
layer being deflected in torsional shear. By careful
tuning of the damper vibration characteristics, its inertia
ring can be induced to move in anti-phase with the
torsional oscillations of the crankshaft and thus oppose
their build-up. As a further simplification, the action of
the damper as a detuner may be compared to that of a
double-jointed pendulum, where the application of a
disturbing force to the upper half can cause both halves
to swing in opposite directions; in other words, their
masses will move in anti-phase (Figure
1.71e).
Methods of mounting torsional vibration dampers
For maximum effec ...