Optimal suppression of parametric vibration in discs under rotating frictional loads

This paper investigates the parametric resonances of a stationary disc exci ted by a rotating frictional load and influenced by a series of mass-spring -damper systems with or without friction. The genetic algorithm is used to find out the right number of mass-spring-damper systems and their optimal p ositions in order to reduce and even eliminate the dynamic instability caus ed by the rotating friction as a follower force on the disc surface. It is found that, if these mass-spring-damper systems involve no or low friction, they can reduce or suppress the dynamic instability of friction-induced pa rametric resonances when correctly located, but they have, at best, no effe ct when the level of friction is high.