[雙語翻譯]盤式制動(dòng)器外文翻譯--楔形盤式制動(dòng)器的動(dòng)態(tài)特性

1、2900 英文單詞， 英文單詞，1.5 萬英文字符，中文 萬英文字符，中文 4600 字文獻(xiàn)出處： 文獻(xiàn)出處：Mahmoud K R M, Mourad M, Mahfouz A B. Dynamic behaviors of a wedge disc brake[J]. Applied Acoustics, 2017, 128: 32-39.Dynamic behaviors of a wedge disc brakeKhaled R

2、.M. Mahmoud, M. Mourad, A. Bin MahfouzAbstract Mathematical models to study the dynamic behavior of a wedge disc brake are presented in this article. The friction coefficient has a significant role in the brake system

3、dynamics especially, self-energized. A set of experiments have been conducted to formulate mathematical equations relating the friction coefficient, normal force and sliding speed. The effect of main operational paramete

4、rs of a wedge disc brake such as normal force, sliding speed and wedge angle on the dynamic behavior and their comparisons with conventional disc brake system are investigated. Setting time and frequency response are the

5、 main performance indicators to investigate the dynamic behavior of a disc brake. The results indicate that friction coefficient significantly influence the resonance frequency and setting time of wedge disc brake shoe f

6、actor. However, the coefficient of friction has a negligible effect on setting time or resonance frequency of conventional disc brake. The effect of sliding speed on a wedge disc brake dynamics is somewhat considerable b

7、ut it has a little effect on the dynamics of a classical disc brake. Moreover, the wedge angle has a considerable effect on the wedge disc brake dynamics. The normal force has negligible influence on dynamic characterist

8、ics of wedge and conventional disc brakes.Keywords: Disc brake dynamic behavior; Friction coefficient; Brake shoe factor; Wedge angle; Self-energized brake1. IntroductionMany researchers are trying to develop the vehicle

9、 disc brakes that may ensure better performance under severe service conditions. The expanding necessities identified with high safety, and better ride comfort of modern vehicles makes them turn out to be more perplexing

10、. These high and principally assorted necessities are to a great extent thought about the car stopping mechanism, and specifically on its brakes [1–3].Friction is the prime factor that may be considered for the dynamic b

11、ehavior of disc brake systems. In uphill case, the braking process is basically a conversion of kinetic or potential energy into heat through friction. Many research works illustrated that the coefficient of friction is

12、affected by several parameters such as the surface area topography, disc and pads properties, temperature, sliding speed, and normal force [4]. There were many efforts to accurately determine the coefficient of friction

13、and its variation with normal force, sliding speed and contact temperature. This leads to the observation that the coefficient of friction is varying with the brake time. There exists a relationship between the sliding s

14、peed and the coefficient of friction especially under extreme loads. Many studies such as Blau [5] concluded that the sliding friction greatly increases with the decrease of the sliding speed. Also, it is observed that t

15、he coefficient of friction decreased with the increase of the sliding speed [6]. Blau [5] also researched to form the relation between the sliding speed and the coefficient of friction under extreme loads. The results in

16、dicate that the coefficient of friction decreases with the increase of the sliding speed. Eriksson et al. [7] have experimentally investigated the relation between the coefficient of friction and the sliding speed. They

17、used five different types of brakes, and each brake had a trend that differed mechanical power. Disc revolution and motor power as well as applied force are the main system input signals. While the brake force and coeffi

18、cient of friction between disc and pads are the output signals to data acquisition system. The test rig is divided into driving unit, braking unit and measurement facilities. An electromechanical actuator is used to gene

19、rate the required applied force. The braking force as required output is measured using load cell. The wedge inclination angle is main-tained at 30°. The input and output data are collected by four-channel data acqu

20、isition system. The driving unit consists of an 18.56 kW AC motor operating at 1500 rpm, that rotates the driving shaft at different rotating speeds. The braking unit comprises the new wedge disc brake assembly, as shown

21、 in Fig. 2. The instruments for measurement include rotational speed (tachometer), applied pressure (a pressure gauge) and tangential force (load cell).Fig. 1. Photo of brake dynamometer test setup and measurement instru

22、mentationFig. 2. Brake dynamometer test setup and measurement instrumentationFig. 3. Disc brake mathematical models (a- conventional b-wedge)Table 1.Conventional and wedge disc brakes parametersParameters Symbol ValuePis