In the last lecture, we have discussed about the limitation of vibration neutralizers as they are designed to reduce the vibration response of the primary system at a specific frequency only. Self tunable neutralizers are attractive for applications where there is a possibility of change of excitation frequency.

Self-Tuned Pendulum Neutralizer

It is known that in a multicylinder engine, the time period of the variation of the turning moment depends on the following parameters:

This dynamic turning moment gives rise to torsional oscillations of the crankshaft. In this lecture, we shall discuss how a pendulum-type neutralizer can remain self-tuned at all rotational speeds of the engine and thus control the torsional oscillations of the crankshaft.