A tuned additive mass to a body subjected to forced vibrations that reduces
the vibration amplitudes. The mass is coupled to the body in a manner that
establishes a node at the previous maximum response of the body to the
applied forces. The mass is constructed to respond in a spring like manner
so that vibration frequencies of the mass is tunable to provide counter
vibrations in the vibration frequency band. Vibration amplitude reduction
is establish by vibrations of the mass that are in phase oppositions of
the body.