By J. Ullmann, et. al.,
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Springer-publishers, Berlin, Heidelberg, New York, 19th ed. 1997, p. B14. DSmpfungsblech. Publication of German patent application (Offenlegungsschrift) DE 197 56 553 Al dated 08-July-1999. © by P Heppes, Gehrden, 2000. Basic material for fig. 1 - 3, 6 & 7 by VDI-publishers, Dusseldorf, 1999 28 A study of initialization and inhibition of disc-brake squeal M ERIKSSON, P BERGMAN, and S JACOBSON Department of Materials Science, Uppsala University, Sweden SYNOPSIS Brake squeals arise from coupled vibrations of the brake components, excited by friction forces acting at the interface between the brake pads and the disc.
They are inter-connected by the friction material which is modelled as a continuous spring. At the abutment the pads are in contact with the carrier, a part of the brake not included in this model and only represented by a flexible contact to ground. The pistons (4) and (5) are in contact with the backplate of the inboard pad and they are modelled as rigid bodies with one degree of freedom in the lateral direction. The pistons are connected to the caliper by springs and dampers. The caliper consists of two parts (6) and (7) each with two degrees of freedom: One translation in the lateral direction and one rotation about the centre of gravity.
The magnitude of the friction forces are then no longer equal on the two sides. A moment is generated by the uneven friction forces on the upper and lower faces of the disc. The moment rotates the disc and pushes a wave forward in the direction of rotation of the disc. The wave increases the relative displacement between the disc and pads and thereby closes the loop in an increasing oscillatory motion. 6. CONCLUSION This model is able to simulate some important aspects of a noise generation mechanism that can be active in automotive disc brakes.