Study on a ball screw type damper with a flyball governor. 2nd Report. Case in which ball nut is attached to foundation.

Abstract

The ball screw type damper discussed here is composed of a ball screw, a flywheel and a flyball governor. When the damper is attached to a single-degree-of-freedom system, the vibration system varies with the cases in which the ball which the ball nut is attached to the main mass or the foundation. The 1 st report was concerned with the former case. In this report, the forced nonlinear vibration, its stability and the effects of the vibration isolation of the damper for the latter case are discussed analytically and numerically. The results may be summarized as follows : (1) The damper is most effective for suppressing the resonance of the primary system when the natural frequency ratio of the governor to the primary system is turned to about 2. (2) Close agreement between the analytical and simulated results is obtained in the region of forcing frequency less than the natural frequency of the governor, and the vibration system is stable in this region. (3) There is little difference of the effect of vibration isolation between the two methods of attachment of the damper.