DefinePK

Abstract

Squeal noise suppression has been a challenging topic investigated by some researchers today. Some methods have been developed to overcome this problem. The performances of these methods are still unsatisfied to eliminate this noise. In recent research, dynamic vibration absorber (DVA) application to prevent the unstable vibration that emits squeal noise has been proposed. The investigation was performed numerically using two simple structures. It was found that by the addition of a stiff spring-mass or a rigid mass might prevent unstable mode coupling that emits squeal noise in specific condition. In this paper, experimental analysis to verify the method using mass addition is conducted using a simple L-shape structure. The effect of additional mass is investigated at two points of the structure; the point that moves more flexibly in parallel to the normal contact force, and the point that moves more flexibly in parallel to the friction force. It is verified that the additional mass at the near-point of friction where the point moves flexibly parallel in a friction force direction will has a possibility to remove the unstable mode coupling and to prevent the squeal noise. Adding mass at the point relatively far from the friction contact and moves more flexible to the normal contact friction will increase the possibility of a squeal noise incident, although in restricted normal contact stiffness the squeal noise is still being canceled. It is confirmed that mass addition to the structure at the near point of friction will prevent unstable mode coupling if the additional mass has more contribution to the horizontal direction and uncoupled from the vertical direction.