Abstract
The control system driving the vibration absorber with the force proportional to the velocity of the primary structure are unstable. This paper presents a method for avoiding this problem. Basically, we transform the stiffness term of the equation for the absorber into the inertia term by replacing the eigenfrequency of the absorber by arbitrary frequencies of excitation. The present control method enables us: (a) to achieve effective and robust control performance over a wide frequency range against marked variations in the primary structure to be controlled; and (b) to control many vibration modes excited by broad-band excitations.
