Abstract
In this paper, a complete finite element model of disc brake considering the ventilated brake disc, pads, back-plate, caliper, bracket, piston, rubber bushes and simplified fluid model driving piston is established. The pressure and speed dependent friction model and temperature field are considered. The results of complex eigenvalue analysis (CEA) show consistence with the existing achievements, thus the feasibility of the established model is verified. Subsequently, the transient dynamic analysis of the brake system is carried out for different exerting process of the pressure which represents the operation of different drivers. Besides, the vibration responses of different brake pressure and different speed are also investigated. The evolution process of the stability is studied by time-frequency analysis (STFT method). Both CEA and time-frequency analysis show the squeal tends to appear in the case of high friction coefficient, low speed and low brake pressure. It can also be found that the vibration frequency and its energy are not constant but fluctuate in a certain range. The results of different pressure exerting processes with simplified fluid model driving piston show that vibration response of disc brake not only depends on the value of brake pressure but also depends on the pressure exerting process. It is supposed that brake pressure and rotational speed determine the frequency of squeal while the process of exerting pressure determines the existing duration of brake squeal.
Highlights
Brake squeal has always been an important concern of quality problems in the automotive industry
Chen [6] proposed that the modal coupling between the in-plane and out-of-plane modes could be responsible for high frequency squeal, Yang [7] and Papinniemi [8] stated that squeal noises were only caused by the in-plane vibration of the disc
The complex eigenvalue analysis (CEA) method is very popular in the industry [13,14,15], here it is used to study the stability of disc brake for the complete model built in Section 2 and the effects of some key parameters, such as the friction coefficient of the contact surfaces, the brake pressure and the rotational speed of disc
Summary
Brake squeal has always been an important concern of quality problems in the automotive industry. Cheng and Hu [11] firstly conducted nonlinear transient dynamic analysis by using finite element method They investigated the effect of nonlinear friction coefficient between the brake disc and pad on the stability of brake system. Liu [13], Nouby [14] and Trichês [15] used CEA method to study the stability of disc brake This method is very time-efficient and may predict the unstable frequencies but it’s difficult to be used to investigate the transient nonlinear response in time domain. Aiming at the above problems, this paper establishes a complete model of disc brake containing the ventilated brake disc, pads, back-plate, caliper, bracket, piston, brake fluid and rubber bushes In this model, the temperature field and the friction model which depends on brake pressure and rotational speed is considered.
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