| KANG Xi,CHEN Guang-xiong,ZHAO Xiao-nan,ZHU Qi.Effect of Brake Shoe Geometric Parameters on Squeal Noise[J],50(6):206-212 |
| Effect of Brake Shoe Geometric Parameters on Squeal Noise |
| Received:June 12, 2020 Revised:October 07, 2020 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2021.06.022 |
| KeyWord:brake system squeal noise finite element analysis mode coupling friction |
| Author | Institution |
| KANG Xi |
Tribology Research Institute, School of Mechanical Engineering, Southwest Jiaotong University, Chengdu , China |
| CHEN Guang-xiong |
Tribology Research Institute, School of Mechanical Engineering, Southwest Jiaotong University, Chengdu , China |
| ZHAO Xiao-nan |
Tribology Research Institute, School of Mechanical Engineering, Southwest Jiaotong University, Chengdu , China |
| ZHU Qi |
Tribology Research Institute, School of Mechanical Engineering, Southwest Jiaotong University, Chengdu , China |
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| Abstract: |
| In order to study the phenomenon of the self-excited vibration induced by the friction force between the friction body of the brake shoe and the wheel tread when the vehicle brakes, a bogie model with a pad-wheel brake system is built by using Solideworks software. In Solideworks Motion, the fluctuation of contact force between the friction body of the brake shoe and the wheel tread is respectively simulated when the pad-wheel friction coefficient is 0, 0.25 and 0.4. The effect of the width, wear degree and the shape of the brake shoe friction body on the tendency of braking squeal noise is investigated with a finite element model of a pad-wheel brake system. The stability of this system is analyzed through the complex eigenvalue method in ABAQUS software, and the distribution of frication-induced self-excited vibrations within frequency domain is obtained. The occurrence propensity of brake squeal noise is evaluated on the basis of the instability coefficient TOI (Tendency of Instability). If the TOI value is greater, the squeal noise is more likely to occur. Results show that the frication force between the friction body of the brake shoe and the wheel tread can induce unstable vibrations, which are capable of leading to the formation of squeal noise. When the friction body width increases to 90 mm from 75 mm, the TOI value drops to 2.819 form 4.226, that is, the probability of the squeal formation decreases with the increasing friction body width of the brake shoe within that range. Meanwhile, the shape of the friction body has a distinct effect on the occurrence of squeal noise, the gap-free friction body is more likely to induce squeal noise than the friction body with the gap when it is braked, and the brake system using the friction body with the trapezoidal gap is the least likely to generate squeal noise. |
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