1、 本科生毕业设计（论文） 外文翻译 毕业设计（论文）题目： 几种典型的制动器的对比分析与设计 外文题目： A disc brake test stand for measurement of airborne wear particles 译文题目： 盘式制动器试验台上测量空气中磨损颗粒 学 生 姓 名： 专 业： 车辆工程 指导教师姓名： 评 阅 日 期： A disc brake test stand for measurement of airborne wear particles ABSTRACT During braking, there is wear on both the r
2、otor and the pads. This process generates particles that may become airborne. In fi eld tests, it is diffi cult to distinguish these particles from others in the surrounding environment.Therefore, a laboratory test stand has been designed which allows control of the cleanliness of the surrounding ai
3、r. The test stand consists of a front right brake assembly mounted in a sealed chamber. A braking load is applied by a pneumatic system and the rotor, which has been pre-conditioned with a rust layer to simulate a car standing parked overnight in a wet environment, is driven by an electric motor. Th
4、e number and size of airborne wear particles are then measured. This experimental set-up has been verifi ed by an initial test series performed at low braking loads. The results suggest that this test stand can be used to study rust layer removal from the rotor. key words: wear； airborne particles；
5、disc brake； test stand； rust layer INTRODUCTION Many studies have shown an association between adverse health effects and the concentration of airborne particles in the atmosphere.1 3 In urban environments, airborne particles can come from different sources, e.g. demolition and construction,4 resusp
6、ended road dust,5 wheel-to-rail contact,6,7 car-to-road contact8,9 and disc brakes.10,11 During braking, both the brake pads and rotors are worn, generating wear particles. Some of these particles are deposited on the brake hardware, and others become airborne. Furthermore, to ensure robust brake pe
7、rformance, some brake systems may require the pads to frequently be in low pressure contact with the rotor. This dragging may remove any rust layer, which may build standing parked overnight in a wet environment, from the rotor and keep the contact surfaces clean. However, the resulting drag torque increases the fuel consumption and generates wear particles, because the pads are still in contact with the rotor after the rust layer has been removed. It is therefore desirable to reduce the dragging without affecting the performance of the brakes.
