FRICTION-INDUCED PARAMETRIC RESONANCES IN DISCS - EFFECT OF A NEGATIVE FRICTION-VELOCITY RELATIONSHIP

Parametric resonances are studied which occur when an elastic system i s rotated around an annular disc with friction having a negative slope with velocity. The elastic system consists of two spring-dashpots, in the transverse and in-plane (circumferential) directions, and a commo n point mass. The complete arrangement is driven around the disc throu gh the in-plane stiffness and damper. It is demonstrated that the effe ct of the in-plane system (including the negative friction-velocity re lationship) is (i) to introduce additional parametric resonances which are destabilised by the transverse damper, and (ii) to reduce the reg ions of instability of the other resonances. (C) 1998 Academic Press L imited.