Disc brake noise analysis using instability of complex eigenvalue / Instabilidade de freios a disco por analise de autovalor complexo

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

To understand, model and mitigate disc brake noise is still one of the greatest challenges for the automotive industry. It is substantially important for manufacturers and suppliers to predict the disc brake noise in a design phase. Squeal is a brake noise in the 1-15 kHz frequency range, and can be defined as a self-excited friction problem, which can generate instabilities. This work comprises how to design and validate a model to predict Squeal, as well as a parametric analysis of such model. This work can be divided in 3 parts: a 2 degree of freedom model, a 5 degree of freedom model, and a finite element model. The first one is used to explain a divergent instability, and the second one to explain and find flutter instability. Then the numeric model is created with a rotor and two pads. The friction is incorporated using the Coulomb model, with spring elements between the contact areas, using mapped and conform meshes. These spring elements form a non-symmetric stiffness matrix, thus the global stiffness matrix will be non-symmetric and yield complex eigenvalues. The unstable frequencies are found through the real part of the eigenvalues. If the real part is positive, then the system is unstable. Finally, a parametric analysis is carried out to depict the influence of some parameters in the eigenvalues

ASSUNTO(S)

vibração freios vibration ruido autovalores complex eigenvalue automobiles brakes noise squeal

ACESSO AO ARTIGO

Documentos Relacionados