外文翻譯--汽車變速箱動(dòng)態(tài)建模輪齒局部缺陷的早期檢測(cè)

1、<p><b>　　附錄1</b></p><p>　　Dynamic Modeling of Vehicle Gearbox for Early</p><p>　　Detection of Localized Tooth Defect</p><p>　　Nagwa Abd-elhalim, Nabil Hammed, Magdy

2、 Abdel-hady,</p><p>　　Shawki Abouel-Seoud and Eid S. Mohamed</p><p>　　Helwan University</p><p><b>　　ABSTRACT</b></p><p>　　Dynamic modeling of the gear vibra

3、tion is a useful tool to study the vibration response of a geared system under various gear parameters and operating conditions. An improved understanding of vibration signal is required for early detection of incipient

4、gear failure to achieve high reliability. However, the aim of this work is to make use of a 6-degree-of-freedom gear dynamic model including localized tooth defect for early detection of gear failure. The model consists

5、of a gear pair, two shafts</p><p>　　KEYWORDS：Vibration acceleration, system modeling, Crest Factor, Kurtosis value, defect size, gear meshing, pinion, gear</p><p>　　NOMENCLATURE</p><p

6、>　　，，， Drive motor, pinion, gear, and load mass moment of inertia</p><p>　　replacement decision in a suitable time.</p><p>　　， Masses of pinion and gear.</p><p>　　Driving

7、 motor torque.</p><p>　　Load torque.</p><p>　　， Friction torque.</p><p>　　， Viscous damping coefficient of pinion and gear bearing.</p><p>　　Gear mesh

8、damping.</p><p>　　Gear mesh stiffness.</p><p>　　， Pinion and gear shaft stiffness.</p><p>　　The variance square.</p><p>　　The number of samples.</p><

9、;p>　　The defect width in face direction.</p><p>　　Unit width Hertzian stiffness.</p><p>　　，，， Angular displacement of drive motor, pinion, gear and load.</p><p>　　，，， Angular vel

10、ocity of drive motor, pinion, gear and load.</p><p>　　，，， Angular acceleration of drive motor, pinion, gear and load.</p><p>　　INTRODUCTION</p><p>　　Much of the past research in the

11、 dynamic modeling area has concluded that an essential solution to the problem is to use a comprehensive computer modeling and simulation tool to aid the transmission design and experiments. These have been two major obs

12、tacles to such an approach: (1) Progress in understanding of the basic gear rattle phenomenon has been limited and slow. This is because the engine-clutch-transmission system involves some strong nonlinearities including

13、 gear backlash, multi-valued</p><p>　　A comprehensive review of mathematical models used in gear dynamics, published before 1986, has been presented by [4]. In this review, gear dynamic models without defect

14、s have been discussed. In the past few years, researchers have been working on the gear dynamic models which include defects like pitting, spalling, crack and broken tooth.</p><p>　　A single-degree-of-freedo

15、m model is used which include the e4ffects of variable mesh stiffness, damping, gear errors, profile modifications and backlash. The effect of time-varying meshing damping is also included in this case, The solution is o

16、btained by using the harmonic balance methods. A method of calculated the optimum profile modification has been proposed in order to obtain a zero vibration of the gear pair [5-7]. They also proposed a linear approximate

17、 equation to mode the gear pair by </p><p>　　Gear rattle vibration is a undesirable vibration for passenger cars and light trucks equipped with manual transmissions. Unlike automatic transmissions, manual tr

18、ansmission do not have the high viscous damping inherent to a hydrodynamic torque converter to suppress the impacting of gear teeth oscillating through their gear backlash. Therefore a significant level of vibration an b

19、e produced by the gear rattle and transmitted both inside the passenger compartment and outside the vehicle. Gear ratt</p><p>　　The gear pair dynamic models including defects have been done by [9]. The study

20、 suggests that little work has been done on modeling of gear vibration with defect and an accurate analytical procedure to predict gear vibrations in the presence of local tooth fault has yet to be developed.However, the

21、 purpose of this paper is to develop a multidegree-of-freedom nonlinear model for a gear pair that can be used to study the effect of lateral-torsional vibration coupling on vibration response in the p</p><p&g

22、t;　　SIGNAL-PROCESSING TECHNIQUE</p><p>　　Among various signal-processing techniques, crest factor and kurtosis analysis have been used for analyzing the whole vibration signal for the early detection of faul

23、t. In this section, crest factor and kurtosis value have been explained.</p><p>　　MATHEMATICAL MODEL FORMULATION </p><p>　　Helical gears are almost always used in automotive transmissions. The m

24、eshing stiffness of a helical tooth pair is time-varying [10], and was modeled as a series of </p><p>　　suggested spur gears so that the simulation techniques for spur gears can be applied. where M is Module

25、 (mm), b is Face width (mm), is pressure angle (deg), is helix angle (deg) and D1 is pitch diameter (mm). Fig. 2 shows the equivalent gear system in the first gear-shift, where the main parameters for the gear system

26、of Fiat-131 gearbox and the equivalent gear system in the first gear-shift are also shown in the figures. </p><p><b>　　附錄2</b></p><p>　　汽車變速箱動(dòng)態(tài)建模輪齒局部缺陷的早期檢測(cè)</p><p>　　Nag

27、wa Abd-elhalim, Nabil Hammed, Magdy Abdel-hady,</p><p>　　Shawki Abouel-Seoud and Eid S. Mohamed </p><p><b>　　阿勒旺大學(xué)</b></p><p><b>　　摘要</b></p

28、><p>　　在研究齒輪系統(tǒng)中各種齒輪參數(shù)的振動(dòng)響應(yīng)和操作條件時(shí)，齒輪振動(dòng)的動(dòng)態(tài)建模是一個(gè)非常有用的工具。對(duì)早期的齒輪檢測(cè)提出了一種改進(jìn)理解的振動(dòng)信號(hào)，但還沒達(dá)到高的可靠性。但是，這項(xiàng)工作的目的是利用一個(gè)6自由度的齒輪動(dòng)力學(xué)模型對(duì)齒輪輪齒缺陷故障的早期檢測(cè)。該模型包括一對(duì)齒輪副、兩個(gè)軸、兩個(gè)慣性負(fù)載、動(dòng)力傳動(dòng)裝置和軸承。由于齒輪的誤差和變動(dòng)，該模型被采用時(shí)受到時(shí)變嚙合剛度、阻尼、反彈和勵(lì)磁的影響。模擬信號(hào)顯示的結(jié)果表

29、明，隨著缺陷尺寸的增加加速度信號(hào)的振幅增加。模擬信號(hào)的波峰因素和峰值隨著缺陷的增加而增加。雖然波峰因素和峰值做同樣的趨勢(shì)，但和波峰因素相比峰值是一個(gè)比較好的指標(biāo)。</p><p>　　關(guān)鍵詞：振動(dòng)加速度、系統(tǒng)建模、波峰因素、峰值、缺陷大小、齒輪嚙合、齒輪</p><p><b>　　專業(yè)術(shù)語</b></p><p>　　，，， 驅(qū)動(dòng)電機(jī)、小

30、齒輪、大齒輪和負(fù)載在一定時(shí)間內(nèi)的慣性矩</p><p>　　， 大齒輪、小齒輪的模數(shù)</p><p><b>　　發(fā)動(dòng)機(jī)驅(qū)動(dòng)轉(zhuǎn)矩</b></p><p><b>　　負(fù)載力矩</b></p><p>　　， 摩擦力矩</p><p>

31、　　， 齒輪、軸承的粘滯阻尼系數(shù)</p><p><b>　　齒輪嚙合阻尼</b></p><p><b>　　齒輪嚙合剛度</b></p><p>　　， 齒輪、齒輪軸的剛度</p><p><b>　　平方差</b></p&g

32、t;<p><b>　　樣本數(shù)量</b></p><p>　　寬度方向的缺陷 </p><p><b>　　單位寬度的剛度</b></p><p>　　，，， 驅(qū)動(dòng)電機(jī)、小齒輪、大齒輪和負(fù)載的角位移</p><p>　　，，， 驅(qū)動(dòng)電機(jī)、小齒輪、大齒輪和負(fù)載的角速

33、度</p><p>　　，，， 驅(qū)動(dòng)電機(jī)、小齒輪、大齒輪和負(fù)載的角加速度</p><p><b>　　引言</b></p><p>　　在大多數(shù)過去的動(dòng)態(tài)建模研究領(lǐng)域中，解決問題的重要辦法是全面使用計(jì)算機(jī)建模和仿真工具來輔助變速器的設(shè)計(jì)和實(shí)驗(yàn)。這種方法有兩種主要的障礙：（1）對(duì)齒輪傳動(dòng)中噪聲基本認(rèn)識(shí)的進(jìn)展是有限的和緩慢的。這是因?yàn)榘l(fā)動(dòng)機(jī)

34、離合器傳動(dòng)系統(tǒng)中包括齒輪側(cè)隙、多值彈簧、非線性滯后等等。（2）齒輪發(fā)出的噪聲是一個(gè)系統(tǒng)問題，并不是齒輪的唯一問題。既使是工業(yè)研究領(lǐng)域已經(jīng)討論了這個(gè)問題在不同階段所出現(xiàn)的不同問題，但并沒有徹底覆蓋工作的框架，整個(gè)研究過程中的問題依然存在。這主要是由于列車電力系統(tǒng)的復(fù)雜性，可能導(dǎo)致你的計(jì)算機(jī)的分析工具效率不高，尤其是工作中遇到許多不同的因素和間隙（例如：齒輪、軸承、花鍵、同步器和離合器）。</p><p>　　在19

35、86年出版之前，對(duì)齒輪動(dòng)力學(xué)中提出的齒輪動(dòng)態(tài)建模進(jìn)行了審查。這次審查中，對(duì)不存在齒輪缺陷的齒輪動(dòng)力學(xué)模型進(jìn)行了討論。在過去的幾年里，研究人員對(duì)齒輪的動(dòng)態(tài)模型缺陷進(jìn)行了研究，其中包括點(diǎn)蝕、剝落、裂縫和齒輪折斷等。</p><p>　　單自由度系統(tǒng)模型中，對(duì)嚙合剛度的影響包括4個(gè)方面的因素，阻尼、齒輪誤差、輪廓變動(dòng)和齒側(cè)間隙，時(shí)變嚙合阻尼效應(yīng)也包含在這種情況中。解決問題的方法是利用諧波平衡的方法。為了實(shí)現(xiàn)齒輪副的零振

36、動(dòng)，提出了一種最優(yōu)化的計(jì)算方法。他們還利用齒輪副單自由度模型提出了一個(gè)近似的線性方程模型。</p><p>　　齒輪噪聲振動(dòng)是轎車和輕型貨車手動(dòng)變速箱中的不良振動(dòng)。不同于自動(dòng)變速箱的是，手動(dòng)變速箱沒有一個(gè)固有的高粘性阻尼液力變矩器以制止通過齒輪側(cè)隙造成的齒輪擺動(dòng)的影響。因此，無論是在車廂內(nèi)外由齒輪振動(dòng)和傳動(dòng)產(chǎn)生的噪聲，對(duì)車輛振動(dòng)的影響都非常大。隨著人們對(duì)汽車高性能振動(dòng)的追求，齒輪松動(dòng)、振動(dòng)以及其他汽車傳動(dòng)系產(chǎn)生的

37、噪聲已成為人們關(guān)注的重點(diǎn)。傳動(dòng)系統(tǒng)中的扭轉(zhuǎn)振動(dòng)是齒輪振動(dòng)的一種主要噪聲來源。手動(dòng)變速箱產(chǎn)生的齒輪噪聲是由于齒輪受到齒輪間隙振動(dòng)的影響。通過軸和軸承把碰撞產(chǎn)生的影響傳輸?shù)阶兯傧錃んw。</p><p>　　對(duì)齒輪副的動(dòng)態(tài)模型缺陷的研究結(jié)果表明，對(duì)齒輪副動(dòng)態(tài)模型缺陷已做了大量工作，用準(zhǔn)確的分析方法對(duì)齒輪振動(dòng)的檢測(cè)在當(dāng)時(shí)輪齒故障方面還沒得到發(fā)展。然而，本研究的目的是建立一個(gè)多自由度非線性模型用于研究，結(jié)果表明輪齒局部缺陷

38、的扭轉(zhuǎn)振動(dòng)是耦合振動(dòng)的響應(yīng)。由于他的產(chǎn)生一個(gè)典型的故障信號(hào)被假設(shè)為自然的脈沖信號(hào)。在不同操作條件下（負(fù)荷、轉(zhuǎn)速等），模擬人工對(duì)多級(jí)汽車變速器齒輪缺陷進(jìn)行了介紹。同時(shí)也對(duì)信號(hào)的仿真和實(shí)驗(yàn)處理進(jìn)行了介紹。</p><p><b>　　信號(hào)處理技術(shù)</b></p><p>　　在各種各樣的信號(hào)處理技術(shù)中，波峰因素、峰值已用于分析整個(gè)振動(dòng)信號(hào)的早期故障。在本節(jié)中，波峰因素和峰