外文翻譯---汽車變速箱動態(tài)建模輪齒局部缺陷的早期檢測

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

2、uel-Seoud and Eid S. Mohamed</p><p>　　Helwan University</p><p><b>　　ABSTRACT</b></p><p>　　Dynamic modeling of the gear vibration is a useful tool to study the vibration

3、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 gear failure to achieve high reliability. How

4、ever, 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 of a gear pair, two shafts</p><p&g

5、t;　　KEYWORDS：Vibration acceleration, system modeling, Crest Factor, Kurtosis value, defect size, gear meshing, pinion, gear</p><p>　　NOMENCLATURE</p><p>　　，，， Drive motor, pinion, gear, and lo

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

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

8、fness.</p><p>　　， Pinion and gear shaft stiffness.</p><p>　　The variance square.</p><p>　　The number of samples.</p><p>　　The defect width in face direction.&l

9、t;/p><p>　　Unit width Hertzian stiffness.</p><p>　　，，， Angular displacement of drive motor, pinion, gear and load.</p><p>　　，，， Angular velocity of drive motor, pinion, gear and load.&

10、lt;/p><p>　　，，， Angular acceleration of drive motor, pinion, gear and load.</p><p>　　INTRODUCTION</p><p>　　Much of the past research in the dynamic modeling area has concluded that an

11、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 obstacles to such an approach: (1) Progress in u

12、nderstanding of the basic gear rattle phenomenon has been limited and slow. This is because the engine-clutch-transmission system involves some strong nonlinearities including gear backlash, multi-valued</p><p

13、>　　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 defects have been discussed. In the past few years,

14、 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-freedom model is used which include the e4ffects of

15、 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 obtained by using the harmonic balance methods

16、. 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 equation to mode the gear pair by </p>

17、<p>　　Gear rattle vibration is a undesirable vibration for passenger cars and light trucks equipped with manual transmissions. Unlike automatic transmissions, manual transmission do not have the high viscous dampi

18、ng 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 be produced by the gear rattle and transmitted

19、 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 suggests that little work has been done on m

20、odeling 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 purpose of this paper is to develop a multid

21、egree-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>　　SIGNAL-PROCESSING TECHNIQUE</p>&l

22、t;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 fault. In this section, crest factor and kurtosis

23、 value have been explained.</p><p>　　MATHEMATICAL MODEL FORMULATION </p><p>　　Helical gears are almost always used in automotive transmissions. The meshing stiffness of a helical tooth pair is t

24、ime-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 (mm), b is Face width (mm), is pressure an

25、gle (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 of Fiat-131 gearbox and the equivalent gear s

26、ystem in the first gear-shift are also shown in the figures. </p><p>　　汽車變速箱動態(tài)建模輪齒局部缺陷的早期檢測</p><p>　　Nagwa Abd-elhalim, Nabil Hammed, Magdy Abdel-hady,</p><p>　　Shawki Abouel-Seoud

27、and Eid S. Mohamed </p><p><b>　　阿勒旺大學</b></p><p><b>　　摘要</b></p><p>　　在研究齒輪系統(tǒng)中各種齒輪參數(shù)的振動響應(yīng)和操作條件時，齒輪振動的動態(tài)建模是一個非常有用的工具。對早期的齒輪檢測提出了一種改進理解的振動信號，但還沒達

28、到高的可靠性。但是，這項工作的目的是利用一個6自由度的齒輪動力學模型對齒輪輪齒缺陷故障的早期檢測。該模型包括一對齒輪副、兩個軸、兩個慣性負載、動力傳動裝置和軸承。由于齒輪的誤差和變動，該模型被采用時受到時變嚙合剛度、阻尼、反彈和勵磁的影響。模擬信號顯示的結(jié)果表明，隨著缺陷尺寸的增加加速度信號的振幅增加。模擬信號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，但和波峰因素相比峰值是一個比較好的指標。</p>

29、;<p>　　關(guān)鍵詞：振動加速度、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)動電機、小齒輪、大齒輪和負載在一定時間內(nèi)的慣性矩</p><p>　　， 大齒輪、小齒輪的模數(shù)</p><p><

30、b>　　發(fā)動機驅(qū)動轉(zhuǎn)矩</b></p><p><b>　　負載力矩</b></p><p>　　， 摩擦力矩</p><p>　　， 齒輪、軸承的粘滯阻尼系數(shù)</p><p><b>　　齒輪嚙合阻尼</b></p><

31、;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><p><b>　　樣本數(shù)量</b></p><p>　　寬度方向的缺陷 </p><p&

32、gt;<b>　　單位寬度的剛度</b></p><p>　　，，， 驅(qū)動電機、小齒輪、大齒輪和負載的角位移</p><p>　　，，， 驅(qū)動電機、小齒輪、大齒輪和負載的角速度</p><p>　　，，， 驅(qū)動電機、小齒輪、大齒輪和負載的角加速度</p><p><b>　　引言<

33、/b></p><p>　　在大多數(shù)過去的動態(tài)建模研究領(lǐng)域中，解決問題的重要辦法是全面使用計算機建模和仿真工具來輔助變速器的設(shè)計和實驗。這種方法有兩種主要的障礙：（1）對齒輪傳動中噪聲基本認識的進展是有限的和緩慢的。這是因為發(fā)動機離合器傳動系統(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)討論了這個問題在不同階段所出現(xiàn)的不同問題，但

34、并沒有徹底覆蓋工作的框架，整個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)致你的計算機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1986年出版之前，對齒輪動力學中提出的齒輪動態(tài)建模進行了審查。這次審查中，對不存在齒輪缺陷的齒輪動力學模型進行了討論。在過去的幾年里，研究人員對齒輪的動態(tài)模型缺陷進行了研究，其中包括

35、點蝕、剝落、裂縫和齒輪折斷等。</p><p>　　單自由度系統(tǒng)模型中，對嚙合剛度的影響包括4個方面的因素，阻尼、齒輪誤差、輪廓變動和齒側(cè)間隙，時變嚙合阻尼效應(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。為了實現(xiàn)齒輪副的零振動，提出了一種最優(yōu)化的計算方法。他們還利用齒輪副單自由度模型提出了一個近似的線性方程模型。</p><p>　　齒輪噪聲振動是轎車和輕型貨車手動變速箱中的不

36、良振動。不同于自動變速箱的是，手動變速箱沒有一個固有的高粘性阻尼液力變矩器以制止通過齒輪側(cè)隙造成的齒輪擺動的影響。因此，無論是在車廂內(nèi)外由齒輪振動和傳動產(chǎn)生的噪聲，對車輛振動的影響都非常大。隨著人們對汽車高性能振動的追求，齒輪松動、振動以及其他汽車傳動系產(chǎn)生的噪聲已成為人們關(guān)注的重點。傳動系統(tǒng)中的扭轉(zhuǎn)振動是齒輪振動的一種主要噪聲來源。手動變速箱產(chǎn)生的齒輪噪聲是由于齒輪受到齒輪間隙振動的影響。通過軸和軸承把碰撞產(chǎn)生的影響傳輸?shù)阶兯傧錃んw。

37、</p><p>　　對齒輪副的動態(tài)模型缺陷的研究結(jié)果表明，對齒輪副動態(tài)模型缺陷已做了大量工作，用準確的分析方法對齒輪振動的檢測在當時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多自由度非線性模型用于研究，結(jié)果表明輪齒局部缺陷的扭轉(zhuǎn)振動是耦合振動的響應(yīng)。由于他的產(chǎn)生一個典型的故障信號被假設(shè)為自然的脈沖信號。在不同操作條件下（負荷、轉(zhuǎn)速等），模擬人工對多級汽車變速器齒輪缺陷進行了介紹。同時也對信號的仿真和

38、實驗處理進行了介紹。</p><p><b>　　信號處理技術(shù)</b></p><p>　　在各種各樣的信號處理技術(shù)中，波峰因素、峰值已用于分析整個振動信號的早期故障。在本節(jié)中，波峰因素和峰值已被解釋。</p><p><b>　　數(shù)學模型</b></p><p>　　汽車變速器中的齒輪大都是斜齒圓