Considerable effort is spent in the design and testing of disk brakes of modern passenger cars. This effort can be reduced if refined mathematical-mechanical models are used for studying the dynamics of these brakes before prototypes are available. Brake squeal is a self-excited vibration resulting from the transfer of rotational energy to vibrating energy of brake components. Dynamic instability arising from the friction force is agreed to be the reason behind brake squeal. Intensive researches on low frequency squeal (noise between 1-5 kHz) have been carried out by the authors and the present paper is devoted to the modeling of the floating caliper disk brake and the suppression of brake squeal using active control. The model includes the brake disk, housing, piston, yoke and brake pads. The floating nature of the caliper has also been taken into account. In a test rig built in TU Darmstadt, the model of the floating caliper disk brake is validated. In addition, the set-up also permits active control by introducing "smart pads". Those brake pads, which include piezoceramic actuators, are successfully used for the suppression of squeal. The authors believe that the "smart pads" can be used as a powerful tool with a high potential for the rapid prototyping of quiet brakes.
抄録全体を表示