制動(dòng)器外文翻譯--盤式制動(dòng)器試驗(yàn)臺(tái)上測(cè)量空氣中磨損顆粒

1、<p>　　本科生畢業(yè)設(shè)計(jì)（論文）外文翻譯</p><p>　　畢業(yè)設(shè)計(jì)（論文）題目：幾種典型的制動(dòng)器的對(duì)比分析與設(shè)計(jì)</p><p>　　外文題目：A disc brake test stand for measurement of airborne wear particles</p><p>　　譯文題目：盤式制動(dòng)器試驗(yàn)臺(tái)上測(cè)量空氣中磨損顆粒<

2、/p><p>　　學(xué) 生 姓 名： </p><p>　　專 業(yè)： 車輛工程 </p><p>　　指導(dǎo)教師姓名： </p><p>　　評(píng) 閱 日 期：

3、 </p><p>　　A disc brake test stand for measurement of</p><p>　　airborne wear particles</p><p><b>　　ABSTRACT</b></p><p>　　During braking

4、, there is wear on both the rotor 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.There

5、fore, a laboratory test stand has been designed which allows control of the cleanliness of the surrounding air. The test stand consists of a front right brake assembly mounted in a sealed chamber. A braking load is appli

6、ed by a pneumatic system and the rotor, which </p><p>　　braking loads. The results suggest that this test stand can be used to study rust layer removal from the rotor.</p><p>　　key words: wear;

7、airborne particles; disc brake; test stand; rust layer</p><p>　　INTRODUCTION</p><p>　　Many studies have shown an association between adverse health effects and the concentration of airborne part

8、icles in the atmosphere.1–3 In urban environments, airborne particles can come from different sources, e.g. demolition and construction,4 resuspended road dust,5 wheel-to-rail contact,6,7 car-to-road contact8,9 and disc

9、 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 be</p><p>　　Furthermore, to ensure ro

10、bust brake performance, 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 environ

11、ment, 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 rus

12、t layer has been removed. It is the</p><p>　　When measuring airborne brake particles in fi eld tests, it can be diffi cult to distinguish them from other traffi c-generated aerosols. Therefore, it may be pre

13、ferable to use laboratory tests that allow control of the cleanliness of the surrounding air. Although several test stands have been built to study wear and friction at the pad-to-rotor interface, few studies12,13 have f

14、ocused on wear particles. In a laboratory test stand, the cleanliness of the surrounding air can be controlled, enabli</p><p>　　has been designed to measure the number and size of airborne wear particles gen

15、erated by disc brakes. The purpose of this paper was to describe this test stand and present the results of a fi rst test series to verify the experimental set-up. These tests focus on rust layer removal at low braking l

16、oads.</p><p>　　EXPERIMENTAL SET-UP</p><p>　　In this test stand, a front right brake assembly from a passenger car is used. The front right brake assembly consists of a knuckle, the wheel bearing

17、 and the disc brake assembly. The disc brake assembly in turn consists of a ventilated rotor, a sliding caliper with a single piston and two brake pads</p><p>　　(Figure 1). The fi nger side brake pad include

18、s a K-type thermocouple that measures the temperature near the fi nger side pad-to-rotor contact.A schematic diagram of the test stand is given in Figure 2. An electric direct current motor (K) with</p><p>　

19、　a nominal torque of 191 Nm drives the rotor, and a pneumatic system (M) connected to the front right brake assembly (H) is used to apply a controlled braking load. When the brake is applied, the motor continues to drive

20、 the system at a stationary rotational speed, i.e. the test system throttles and brakes</p><p>　　at the same time. A drive shaft (L) transfers the torque from the motor to the wheel bearing, which in turn ro

21、tates the disc. The motor and the drive shaft are connected by a fi xed coupling, and the wheel bearing and the drive shaft are connected by a splined coupling. The knuckle is mounted to a suspension</p><p>

22、　　device. A sealing chamber (G) seals the front right brake assembly from the surroundings. The electric motor is balanced with bearings on each end. The applied torque on the motor is measured using a calibrated strain

23、gauge force sensor multiplied by the distance from the motor centre,with an accuracy of ±2.2%. The rotational speed of the disc is measured by a built-in Hall effect sensor in the wheel bearing, with 48 pulses per r

24、evolution. A pneumatic system generates controlled low pressure lev</p><p>　　of ±0.5% by a calibrated piezoelectric pressure sensor near the inlet of the brake cylinder.</p><p>　　盤式制動(dòng)器試驗(yàn)臺(tái)上測(cè)

25、量空氣中磨損顆粒</p><p><b>　　摘要</b></p><p>　　在制動(dòng)過(guò)程中，制動(dòng)盤和摩擦片都有磨損。這個(gè)過(guò)程產(chǎn)生的碎粒有可能進(jìn)入到空氣中。在實(shí)地測(cè)試中，是很難辨別來(lái)自周圍環(huán)境的其他碎粒的影響。因此，實(shí)驗(yàn)室中試驗(yàn)臺(tái)的設(shè)計(jì)，被允許對(duì)周圍空氣環(huán)境的清潔度進(jìn)行控制。該試驗(yàn)臺(tái)中有一個(gè)右前方剎車總成，它安裝在一個(gè)密封腔中。制動(dòng)負(fù)荷由氣壓系統(tǒng)實(shí)施，制動(dòng)盤由電動(dòng)馬達(dá)

26、驅(qū)動(dòng)，制動(dòng)盤表面已經(jīng)預(yù)先產(chǎn)生一層生銹層，用以模仿在潮濕的環(huán)境下停泊一晚的汽車的制動(dòng)盤。然后測(cè)量空氣中的磨損顆粒的數(shù)量以及大小。這個(gè)實(shí)驗(yàn)裝置已經(jīng)在低負(fù)荷制動(dòng)下，經(jīng)過(guò)一系列的初始測(cè)試的結(jié)果所證實(shí)。這個(gè)結(jié)果表明該試驗(yàn)臺(tái)能被用于研究制動(dòng)盤生銹層除銹。</p><p>　　關(guān)鍵詞：磨損;空氣中顆粒物;盤式制動(dòng)器試驗(yàn)臺(tái);銹層</p><p><b>　　簡(jiǎn)介</b></p&

27、gt;<p>　　許多研究已經(jīng)證明，對(duì)健康不利的影響和空氣中顆粒物在大氣中的濃度之間的關(guān)聯(lián)。在城市環(huán)境中，空氣中的顆粒物可能來(lái)自不同渠道，例如拆遷和建設(shè)，粉塵懸浮路，輪軌到軌接觸，車到路面接觸以及盤式制動(dòng)器。在制動(dòng)過(guò)程中，無(wú)論是剎車片與制動(dòng)盤的磨損，都會(huì)產(chǎn)生磨損顆粒。其中一些磨損顆粒沉積在制動(dòng)系統(tǒng)的硬件上，而另一些則隨風(fēng)飄散。此外，為確?？煽恐苿?dòng)性能，一些制動(dòng)系統(tǒng)需要?jiǎng)x車片與制動(dòng)盤經(jīng)常處于低壓接觸狀態(tài)。這種牽引可以去除汽車

28、因在潮濕的環(huán)境停泊一晚所產(chǎn)生的任何生銹層，去除了制動(dòng)盤上的銹層還能保持接觸面的清潔。然而，由此產(chǎn)生的阻力距增加了燃料的消耗和產(chǎn)生的磨損顆粒，因?yàn)槟Σ疗谏P層去除后仍然會(huì)與制動(dòng)盤接觸。因此，應(yīng)該在不影響剎車性能的前提下盡量減少剎車拖動(dòng)。</p><p>　　在實(shí)地測(cè)試時(shí)，測(cè)量空氣制動(dòng)顆粒，區(qū)別它與其他方式產(chǎn)生的氣溶膠是很困難的。因此，允許控制周圍的空氣潔凈度可能是最好使用的實(shí)驗(yàn)室測(cè)試。盡管有幾個(gè)試驗(yàn)站已經(jīng)建成用于

29、研究耐磨以及制動(dòng)盤和摩擦片界面摩擦，一些研究主要集中在磨損顆粒。</p><p>　　在實(shí)驗(yàn)室試驗(yàn)臺(tái)，控制周圍的空氣潔凈度可以更多更準(zhǔn)確的研究空氣剎車磨損顆粒。考慮到這一點(diǎn)，實(shí)驗(yàn)室組件試驗(yàn)臺(tái)被設(shè)計(jì)來(lái)測(cè)量空氣中磨損顆粒的數(shù)量和盤式制動(dòng)器磨損產(chǎn)生的顆粒大小。本文的目的是來(lái)描繪這個(gè)試驗(yàn)臺(tái)和目前第一個(gè)測(cè)試系列的結(jié)果，用以驗(yàn)證實(shí)驗(yàn)裝置.這些實(shí)驗(yàn)旨在研究低負(fù)荷制動(dòng)下將如何去除生銹層。</p><p>

30、<b>　　實(shí)驗(yàn)裝置</b></p><p>　　在這個(gè)測(cè)試站，使用到轎車右前制動(dòng)總成。右前制動(dòng)總成由轉(zhuǎn)向節(jié)，車輪軸承和盤式制動(dòng)器總成組成。盤式制動(dòng)器總成又由一個(gè)通風(fēng)制動(dòng)盤組成，它是指帶有活塞的浮鉗盤制動(dòng)器和兩個(gè)摩擦片。手指端剎車片包括K型熱電偶，用來(lái)測(cè)量接近指端制動(dòng)盤與摩擦片接觸面的溫度。</p><p>　　該試驗(yàn)臺(tái)的原理圖圖2中給出。電動(dòng)直流馬達(dá)（k）與191牛

31、米的驅(qū)動(dòng)器的轉(zhuǎn)子額定轉(zhuǎn)矩，和氣動(dòng)系統(tǒng)（M）連接到右前方制動(dòng)器總成（H）都是用來(lái)控制制動(dòng)載荷應(yīng)用的。當(dāng)制動(dòng)器工作時(shí)，電機(jī)始終推動(dòng)系統(tǒng)處于一個(gè)固定的轉(zhuǎn)速，即測(cè)試系統(tǒng)油門和制動(dòng)器在同一時(shí)間。傳動(dòng)軸（L）將轉(zhuǎn)矩由電機(jī)傳遞到車輪軸承，進(jìn)而傳遞到制動(dòng)盤上。電機(jī)和傳動(dòng)軸由一個(gè)固定的耦合連接，車輪軸承和傳動(dòng)軸由花鍵聯(lián)接。轉(zhuǎn)向節(jié)安裝在懸架裝置上。一個(gè)密封腔（G）將右前制動(dòng)總成與周圍環(huán)境隔離。</p><p>　　電動(dòng)機(jī)靠?jī)啥四┑妮S