A Thermal Mechanical Approach To The Brake Squeal Analysis

Brake squeal is an instability issue with many parameters.People begin to show increasing interest in this subject.Finite element approach is one of the most preferred tool to evaluate the squeal issue these years.A great many researches have been conducted while many of which ignored the thermal influence.This study attempts to assess the effect of thermal condition,which may lead to the increase of stress and deformation of the brake assembly or the change of the material property as young's modulus,on brake squeal behavior through finite element computation since it could be hundreds of degrees during braking procedure.A thermal mechanical model has been created to evaluate brake squeal performance in the case using a sequential coupling method where thermal load was imported as a temperature field.the work could be summarized as follows:1.A precise and detail finite element model was developed after an experiment free-free modal analysis and a free-free modal simulation.the finite element model was tuned in young's modulus and Poisson's ratio by comparing results from both.2.The thermal analysis was performed to acquire the temperature field of system which was coupled later to gain stress,strain and deformation results under the thermal mechanical situation.3.Complex eigenvalue analyses were conducted to assess system brake squeal performance under different friction coefficients or young's modulus and with or without thermal load by observing real and imaginary parts of eigenvalues.4.The transient dynamic method was adopted after setting proper probe points.influences of friction coefficient,young's modulus and thermal load were all taken accounts after calculating out the acceleration response and the frequency spectrum transformed by the fast Fourier transform method.Results in this section were compared with complex eigenvalue ones.5.A harmonic response analysis was used to make supplementation for methods as mentioned above to investigate thermal influences of the brake assembly on brake squeal simulation.6.After all the simulation being calculated,minor modifications of the brake assembly were then made to figure ways trying to suppress brake squeal.