A mechanical model has been developed to reproduce the dynamics of a disk brake assembly. The final aim is to derive an accurate model for predicting brake squeal at an early stage of development, when changing the geometry of the brake is still possible. The disk has been modeled analytically as a thin plate, its parameters have been identified by considering a complex FE model able to reproduce accurately the actual disk vibration modes. The brake caliper assembly (i.e. stationary part of the brake) has been modeled by a lumped parameter model for both the caliper and the pistons and by a simple finite element model representing the two pads. Also the parameters of the stationary part have been identified. Both the disk model and the stationary part model have been assembled together, by connecting them by means of constant stiffness springs. A complex eigenvalue analysis has been completed to investigate the dynamic stability of the system. The noise index, defined as the ratio between real part of eigenvalue and the module of the eigenvalue, has been used to predict the brake squeal phenomenon. Some unstable modes have been identified. A sensitivity analysis has been completed on the considered brake assembly. The effects of the most relevant design variables, such as pad geometry, disk height, caliper stiffness and pad springs have been quantitatively assessed.
Brake squeal prediction, a semi-analytical model
MASTINU, GIANPIERO;GOBBI, MASSIMILIANO;TARALLO, ERMES;
2012-01-01
Abstract
A mechanical model has been developed to reproduce the dynamics of a disk brake assembly. The final aim is to derive an accurate model for predicting brake squeal at an early stage of development, when changing the geometry of the brake is still possible. The disk has been modeled analytically as a thin plate, its parameters have been identified by considering a complex FE model able to reproduce accurately the actual disk vibration modes. The brake caliper assembly (i.e. stationary part of the brake) has been modeled by a lumped parameter model for both the caliper and the pistons and by a simple finite element model representing the two pads. Also the parameters of the stationary part have been identified. Both the disk model and the stationary part model have been assembled together, by connecting them by means of constant stiffness springs. A complex eigenvalue analysis has been completed to investigate the dynamic stability of the system. The noise index, defined as the ratio between real part of eigenvalue and the module of the eigenvalue, has been used to predict the brake squeal phenomenon. Some unstable modes have been identified. A sensitivity analysis has been completed on the considered brake assembly. The effects of the most relevant design variables, such as pad geometry, disk height, caliper stiffness and pad springs have been quantitatively assessed.File | Dimensione | Formato | |
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ATZ_2012_brake_squeal.pdf
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Chassis.tech plus 2012-ID_PRODOTTI-662017-662020.pdf
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