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1、 景德鎮(zhèn)陶瓷學(xué)院本科畢業(yè)設(shè)計（論文）外文翻譯 景德鎮(zhèn)陶瓷學(xué)院 畢業(yè)設(shè)計(論文)有關(guān)外文翻譯 院 系： 機(jī)械電子工程學(xué)院 專 業(yè)： 機(jī)械設(shè)計制造及其自動化 姓 名： 黃 榮 軍 學(xué) 號： 200810310436 指導(dǎo)教師： 呂 冬 青 完成時間： 2012-04-15

2、 說 明 1、將與課題有關(guān)的專業(yè)外文翻譯成中文是畢業(yè)設(shè)計（論文）中的一個不可缺少的環(huán)節(jié)。此環(huán)節(jié)是培養(yǎng)學(xué)生閱讀專業(yè)外文和檢驗學(xué)生專業(yè)外文閱讀能力的一個重要環(huán)節(jié)。通過此環(huán)節(jié)進(jìn)一步提高學(xué)生閱讀專業(yè)外文的能力以及使用外文資料為畢業(yè)設(shè)計服務(wù)，并為今后科研工作打下扎實的基礎(chǔ)。 2、要求學(xué)生查閱與課題相關(guān)的外文文獻(xiàn)3篇以上作為課題參考文獻(xiàn)，并將其中1篇（不少于3000字）的外文翻譯成中文。中文的排版按后面格式進(jìn)行填寫。外文內(nèi)容是否與課題有關(guān)由指導(dǎo)教師把關(guān)，外文原文附在后面。 3、指導(dǎo)教師應(yīng)將此外文翻譯格式文件電子版拷給所指導(dǎo)的學(xué)生，統(tǒng)一按照此排版格式進(jìn)行填寫，完成

3、后打印出來。 4、請將封面、譯文與外文原文裝訂成冊。 5、此環(huán)節(jié)在開題后畢業(yè)設(shè)計完成前完成。 6、指導(dǎo)教師應(yīng)從查閱的外文文獻(xiàn)與課題緊密相關(guān)性、翻譯的準(zhǔn)確性、是否通順以及格式是否規(guī)范等方面去進(jìn)行評價。 指導(dǎo)教師評語： 簽名： 年 月 日 變橢圓軌跡振動篩的動力學(xué)和篩選特性 何小梅，劉楚生 機(jī)械和電氣工程學(xué)院，中國礦業(yè)大學(xué)科技，江蘇省徐州市221116，中國

4、摘要：根據(jù)恒床厚度的篩選過程振動篩理想運(yùn)動特征被提出， 提出了一個新的振動篩變橢圓跟蹤。 準(zhǔn)確的力學(xué)模型建立，根據(jù)所需的結(jié)構(gòu)構(gòu)造運(yùn)動特征。 應(yīng)用多種學(xué)位自由度振動理論、特點，分析振動篩的。 振動篩運(yùn)動參數(shù)獲得，它的運(yùn)動軌跡有線性的，圓的，橢圓的。振動篩的運(yùn)動動態(tài)方程可通過計算機(jī)模擬得以有效的解決。屏幕表面五個特殊的點的技術(shù)參數(shù)，包括振幅，運(yùn)動速度和引發(fā)指數(shù)，是通過理論計算獲得。 結(jié)果顯示，新設(shè)計的振動篩的軌跡遵循理想的篩選運(yùn)動。篩分效率及處理能力可能因此而有效改進(jìn)。 關(guān)鍵字：變橢圓軌跡；篩選過程與常量床厚度；動態(tài)模型；運(yùn)動特性； 篩選特征 1介紹 篩分操作是一個重要的煤礦處理組成部分。

5、振動篩是最廣泛使用的篩選工具之一。 振動篩，如直線振動篩、圓振動篩或橢圓振動篩，有一個簡單的平移運(yùn)動。在篩面上處處運(yùn)動保持相同的運(yùn)輸速度和引發(fā)指數(shù)的，從而導(dǎo)致低效率的篩選。充實的拋擲指數(shù)提高加工能力打破了電機(jī)或降低了工作強(qiáng)度。 在本文中，我們報告的設(shè)計，一個新的振動篩變運(yùn)動的痕跡，原則的基礎(chǔ)上篩選過程固定床厚度不同的部分。振動篩穿越不同的橢圓軌跡和由此產(chǎn)生的議案，同意與理想的運(yùn)動。因此，屏幕處理能力和效率均可以提高。 2振動表面的理想運(yùn)動和變橢圓軌跡振動篩的建議 2.1振動篩常見的篩選特性 振動篩通常工作在固定振動篩上的物料表面強(qiáng)度。移動投擲，滾動或滑動運(yùn)動”。 為常見的安檢，物料粒度

6、廣泛分布在進(jìn)料端的能量傳遞。物質(zhì)粒子的振動篩嚴(yán)重消退。因此，大量顆粒層只有很短的距離飼料結(jié)束。材料穿透屏幕在第一個1/ 4到1 /2的屏幕，它影響篩選和降低加工能力的。減少細(xì)粒物質(zhì)導(dǎo)致比粒子的大小接近或大于網(wǎng)格。因此，篩分效率下降驚人。物料粒度同時統(tǒng)一的，從振動源給予物料的能量損失很小。因而物料粒子的振幅和速度增加。這導(dǎo)致了物料的垂直深度在送電端厚，而在放電結(jié)束端薄，進(jìn)而影響了篩分效率和處理能力。常見的篩分特性如圖1. 2.2屏幕表面的理想運(yùn)動和實施方案 根據(jù)篩選過程恒床等厚的原則，理想的運(yùn)動的屏幕表面的描述如下。 3 變橢圓軌跡振動篩的動力學(xué)模型分析 我們激振力偏離中心

7、重力，要更改新的運(yùn)動模式 振動篩。 剛度矩陣的振動 隔離春天是根據(jù)這些不是零 情況和振動系統(tǒng)有多重 自由度。 小橫搖 被忽視的簡化研究。 議案 被認(rèn)為是剛性梁的非線性振動 縱向?qū)ΨQ平面。 在每個點 振動是一個組合翻譯 的重心和屏幕投球 重心。 以前的研究被忽視 水平彈性勢力的影響 垂直方向振動的秋千 屏幕 [311] . 準(zhǔn)確的動態(tài)模型組成 包括耦合的三個微分方程 自由度在垂直、水平和 擺動方向建議。 振動篩的數(shù)學(xué)模型 圖中所示.2。 重力澳中心，采取 直角坐標(biāo)系的原點在靜態(tài) 均衡，按照剛性運(yùn)動 平面 [12] . 微分方程組 廣義坐標(biāo)使用重心 坐標(biāo)x、y和秋千赤緯角， θ，可以寫成

8、： 其中m是振動篩的質(zhì)量；j# 轉(zhuǎn)動慣量美元相對于中心 重力，澳；x和y的x和y位移 方向；x和y在x和y的速度 方向；加速x和y在x和 你們方向；θis擺動角位移； αthe安裝角度；外匯、f橫跨薩楊德河fθthe 阻尼系數(shù)在x、y andθdirections； k和k ythe剛度系數(shù)的支持 沿x和y directions;a0汀春天 激振力的振幅，提供的 2 0 =mrω， 偏心其中r為半徑，m的質(zhì)量 偏心塊andωthe刺激角頻率； 1 我和l2每個之間的距離支持 春季和重心，我的距離 偏心塊的旋轉(zhuǎn)中心之間 重心；而βthe夾角 我和x路之間。 阻尼力 相當(dāng)小，可以忽略。

9、然后，式（1）可以簡化式（2）。 4變橢圓軌跡振動篩的運(yùn)動和篩選的效果分析 4.1個分析的運(yùn)動參數(shù)多自由度振動理論用來尋找一個穩(wěn)定解的強(qiáng)迫振動 [ 13]，如下： 替代參數(shù)在式（3）到（2）式。允許一個穩(wěn)定的解決方案被發(fā)現(xiàn)。 假設(shè)一個點的屏幕坐標(biāo)為D(Dx,Dy).運(yùn)動方程如下： 當(dāng)，D點的軌跡是一條直線。當(dāng)E=S，C=HS時，D點的軌跡是圓。 一般來說，（6）式表示方程的橢圓面直角坐標(biāo)系。XOY坐標(biāo)系以γ角速度逆時針旋轉(zhuǎn)從而給定一個新的坐標(biāo)系。一個標(biāo)準(zhǔn)的橢圓公式在消除xDyD后可得公式（7）。 從這我們知道有些屏幕上的點 移動或圓的

10、行中，而其他移動 橢圓。 只要旋轉(zhuǎn)的相對位置 偏心塊的中心和重心 正確調(diào)整，變橢圓運(yùn)動 屏幕將獲得的。 這提供了一個合理的 扔指數(shù)和材料傳遞速度和 提高篩分效率。 4.2 運(yùn)動軌跡和篩分效率分析 穩(wěn)定振動系統(tǒng)解決方案，就振動篩而言的，可以給出 在振動篩上任一點的運(yùn)動方程為 公式（8）表示重心的痕跡近似圓形，水平和垂直方向的振幅在3.5mm 和5mm之間。圖 3表示如重心的移動存在三個自由度。圖3水平和垂直方向的相位差和擺角的振幅一樣。 5 結(jié)論 1）新振動篩變橢圓 根據(jù)原則提出了運(yùn)動軌跡 常數(shù)床厚度的篩選過程。 振動篩跟蹤不同的不同點 橢圓路徑。 運(yùn)動規(guī)律也同意配

11、合 篩面的理想運(yùn)動特性。 因此，篩選能力和處理效率 會增加。 2）振動的理論運(yùn)動學(xué)分析 屏幕做是為了研究如何變不同 參數(shù)會影響屏幕的議案。 電影 抽搐振動篩參數(shù)的議案 線性跟蹤，獲得圓或橢圓。 3) 總振動篩運(yùn)動的痕跡 通過計算機(jī)模擬獲得。 篩選 技術(shù)參數(shù)，包括振幅， 速度和引發(fā)指數(shù)，五個的特定點 沿屏幕表面計算。 這些 參數(shù)是與篩分效率。 結(jié)果顯示模式設(shè)計的議案 振動篩符合理想的篩選 議案，設(shè)計能夠有效 提高篩分效率。 4) 勵磁機(jī)軸中心的地位，相對 振動篩的重心，是 篩選高效的極為重要的。 因此，我們 可以設(shè)計一個振動篩具有更高的處理 的能力而又不會增加功耗 調(diào)整軸中心的相對位置。

12、這.。 是一個點，需要進(jìn)一步研究。 參考文獻(xiàn) [1] Wen B C,Liu F Q.振動的理論與應(yīng)用機(jī)器.北京：中國機(jī)械出版,1982 [2] Gu Q B,Zhang E G.復(fù)雜軌跡振動篩研究. 1998(1):42–46 [3] Hao F Y.煤制備手冊：技術(shù)設(shè)備.北京：中國煤炭行業(yè)出版社,1993 [4] Yan F.篩分機(jī)械.北京：中國煤炭行業(yè)出版社.1995 [5] Liu C S,Zhao Y M..篩面上的非線性特性的研究. 礦物處理設(shè)備,1999(1):45–48 [6] Tao Y J,Luo Z F,Zhao Y M..在重力強(qiáng)力分離器使用方面的煤

13、脫硫的實驗研究.中國礦業(yè)與技術(shù)大學(xué). 2006,16(4):399–403 [7]Zhang E G.篩分，粉碎，脫水設(shè)備.北京:中國煤工業(yè)出版社，1991 [8] Khoury D L.煤清潔工藝.美國：諾易斯數(shù)據(jù)公司，1981 [9] Shang N X,Na J F. 2TYA1842圓振動篩.礦業(yè)與加工設(shè)備，1990(2):20–24 [10] Ye H D.等厚圓篩分及其應(yīng)用. 燒結(jié)和碼垛, 1999,5(3):30–33 [11] Wen B C,Liu S Y,He Q.振動機(jī)械理論和動力學(xué)設(shè)計方法.北京：中國機(jī)械出版社，2001 [12] Wang F,Wang H

14、.篩分機(jī)械. 北京：中國機(jī)械出版社，2001 [13] Ni Z H.振動力學(xué).西安：西安交通大學(xué)出版社，1989 [14] Zhu W B.復(fù)雜運(yùn)動軌跡振動篩的工作原理和計算機(jī)仿真.礦業(yè)與加工設(shè)，2004(10):34–36 [15] Peder M.莫根深系列—一種新型的篩分概念.礦物加工，1996,7(37):311–315 [16] Wen B C.圓振動篩的自動同步理論.波士頓：美國機(jī)械工程協(xié)會，1987:495–500. Dynamics and screening characteristics of a vibrating screen

15、 with variable elliptical trace HE Xiao-mei,LIU Chu-sheng School of Mechanical and Electrical Engineering,China University of Mining & Technology,Xuzhou,Jiangsu 221116,China Abstract: the ideal motion characteristics for the vibrating screen was presented , according to the principle of screenin

16、g process with constant bed thickness. A new vibrating screen with variable elliptical trace was proposed. An accurate mechanical model was constructed according to the required structural motion features.Applying multi-degree-of-freedom vibration theory,characteristics of the vibrating screen was a

17、nalyzed.Kinematics parameters of the vibrating screen which motion traces were linear,circular or elliptical were obtained.The stable solutions of the dynamic equations gave the motions of the vibrating screen by means of computer simulations.Technological parameters,including amplitude,movement vel

18、ocity and throwing index,of five specific points along the screen surface were gained by theoretical calculation .The results show that the traces of the new designed vibrating screen follow the ideal screening motion .The screening efficiency and processing capacity may thus be effectively improve

19、d. Keywords:variable elliptical trace;screening process with constant bed thickness; dynamic model;motion characteristic;screening characteristics 1 Introduction Screening operations are an important part of coal processing. The vibrating screen is one of the most extensively used screening too

20、ls. Vibrating screens, such as linear vibrating screen, circular vibrating screen or elliptical vibrating screen, have a simple translational motion. The motion follows the same path everywhere on the screen and so the screen has constant transport velocity and throwing index, which leads to low scr

21、eening efficiency. Augmenting the throwing index to improve breaks the exciting motors processing capacity lowers the working. In this paper , we report on the design of a new vibrating screen with variable motion traces that is based on the principle of screening process with constant bed thicknes

22、s [3–4].Different parts of the vibrating screen traverse different elliptical traces and the resulting motion agrees well with the ideal motion .Thus the screen processing capacity and efficiency can both be improved. 2 Ideal motion for a screen surface and the proposal of a vibrating screen with

23、variable elliptical trace 2.1 Screening characteristics of common vibrating screens Vibrating screens commonly work at a fixed vibration intensity .Material on the screen surface moves by throwing, rolling or sliding motions .For common screeners ,material granularity is widely distributed at the

24、feed end .The energy imparted to the material particles from the vibrating screen is severely dissipated .Consequently ,a large number of particles become laminated only a short distance from the feed end .The material penetrates the screen within the first 1/4 to 1/2 of the screen ,which affects sc

25、reening and lowers processing capacity [5].The decrease of fine-grained material causes the ratio of particles close in size to ,or larger than ,the mesh to increase .Thus ,the screening efficiency declines dramatically .The material granularity simultaneously becomes uniform and the energy imparted

26、 from the vibrations to the material suffers little loss .Hence ,the amplitude and velocity of the material particles increase .This causes the material bed depth at the feed end to be thick while at the discharge end it is Thin .This kind of motion leads to an asymmetrical penetration along the sc

27、reen surface,which influences the screening efficiency and processing capability [6].Common screening characteristics are shown in Fig.1. 2.2 Ideal motion for screen surface and implementing scheme The ideal motion for screen surface is described below, according to the principle of screening pr

28、ocess with constant bed thickness .The feed end of the screen has a bigger throwing index and a higher material delivery velocity ,which makes bulk material quickly penetrate and causes rapid de-laminating. Earlier lamination of material increases the probability of fine-grained material passing thr

29、ough the mesh .The screen has an appropriate throwing index and a little higher material delivery velocity in its middle part .This is of benefit for stabilizing fine-grained materials and for penetrating uniformly along the screen length .A lower throwing index and material delivery velocity near t

30、he discharge end causes the material to stay longer on the screen and encourages more complete penetration of the mesh. Two methods are currently used to improve screening efficiency [7–8].The first is to add material to the screen from multiple feed ports. This is troublesome in practical use espec

31、ially in terms of controlling the distribution of differently granulated materials .Hence it is rarely used in practical production. The second way is to adopt new screening equipment like, for example, a constant thickness screen. The motion of the new screen surface causes material to maintain the

32、 same, or an increased, thickness .It achieves a rather more ideal motion. The main problem with the constant thickness screen is that it covers a bigger area and that the structure is complicated and hard to maintain .A simple structure with good screening efficiency is still a necessity. We have

33、designed a new vibration screen with a variable elliptical trace that is based upon an ideal screen motion for use in raw coal classification. The size of the vibrating screen is 3.6 m7.5 m,the feed granularity is 0 to 50 mm and the classification granularity is 6mm.Elliptically vibrating screens co

34、mbine the basic advantages of both circular and linear vibrating screens [9–10].The long axis of the ellipse determines material delivery and the short axis influences material loosening, to be exact. 3 Dynamics model analysis of vibrating screen with variable elliptical trace We made the exciting

35、 force deviate from the center of gravity,to change the motion pattern of the new vibrating screen.The stiffness matrix of the vibration isolation spring was not zero under these circumstances and the vibrating system had multiple degrees of freedom.Minor transverse wagging was neglected to simplify

36、 the research.The motion was considered to be a linear vibration of a rigid beam in the longitudinally symmetrical plane.At each point the vibration is a combination of the translation of the center of gravity and the screen pitching about the center of gravity.Previous studies neglected the influen

37、ce of elastic forces in the horizontal and vertical direction on the swing of the vibrating screen [3,11].An accurate dynamic model consisting of three differential equations that include coupling of degrees of freedom in the vertical,horizontal and swing directions is proposed. The mathematical

38、model of the vibrating screen is shown in Fig.2.The center of gravity, is taken as the origin of a rectangular coordinate system at static equilibrium, in accordance with rigid motion on the plane [12].Simultaneous differential equations in generalized coordinates using center of gravity coordinate

39、s,(x,y),and the swing declination angle, θ,may be written as where M is the mass of the vibrating screen’s the moment of inertia of M relative to the center of gravity,O;x and y the displacements in the x and y0directionas;x and y the velocities in the x and y directions’ and y the accelerations

40、in the x and y directions; is the swing angular displacement; αthe installation angle;fx,f yond father damping coefficients in the x,y and directions; x k and k the stiffness coefficients of the supporting spring along the x and y directions; A0 the amplitude of the exciting force, given by2 0 A =m

41、rω, where r is the radius of eccentricity the mass of the eccentric block and the exciting angular frequency; L1 and L2 the distances between each supporting spring and the center of gravity’s the distance between the rotating center of the eccentric block and the center of gravity; and,βthe include

42、d angle between the l and x directions. The damping force is rather small and can be neglected. Then Eq. (1) can be simplified to Eq.(2). 4 Motion and screening effect analysis of a vibrating screen with variable elliptical trace 4.1 Analysis of the motion parameters Multiple degree-of-freedom v

43、ibration theory was used to find a stable solution for the forced vibration [13],as follows: When E 2 S 2 +C 2 H 2 +2 ESCH=0, the trace of point D is a line. When E =Sand C =H, the trace of point D is a circle. In general. (6) expresses the equation of an ellipse.The xoy coordinate was

44、rotated γ degrees anticlockwise to give a new set of x ′oy′coordinates. A standard elliptical equation was then obtained after eliminating D D x y in Eq.(7). From this we know that some points on the screen move in a line or a circle while others move in an ellipse .As long as the relative po

45、sition of the rotating center of the eccentric block and the center of gravity are properly adjusted, variable elliptical motion of the screen will be obtained .This provides a reasonable throwing index and material delivery velocity and improves screening efficiency. 4.2 Analysis of motion trace a

46、nd screening efficiency The stable solution of a vibrating system, in terms of the vibrating screen, can be given by The equations of motion for any point on the vibrating screen are Eq.(8)shows that the center of gravity traces an approximate circle and that the amplitude in the horizontal

47、and vertical directions is between 3.5 mm and 5 mm.Fig.3 shows how the center of gravity moves in three degrees of freedom.Fig.3 gives the angular phase difference between the horizontal and vertical directions as well as the amplitude of the swing angle. 5 Conclusions 1)A new vibrating screen

48、with variable elliptical motion trace was proposed according to the principle of screening process with constant bed thickness.Different points on the vibrating screen trace differentelliptical paths.The motion pattern agrees well with the ideal motion characteristic for a screening surface. Thus,sc

49、reening capacity and process efficiency can be increased. 2)A theoretical kinematic analysis of the vibrating screen was done to study how varying different parameters affects the motion of the screen.Kinema- tics parameters of the vibrating screen that motion traces are linear,circular or elliptic

50、al are obtained. 3) Motion traces of total vibrating screen were gained through computer simulations.Screening technological parameters,including amplitude, velocity and throwing index,of five specific points along the screen surface were calculated. These parameters are related to screening effic

51、iency. The results show that the motion pattern of the designed vibrating screen conforms to an ideal screening motion and that the design is able to effectively improve screening efficiency. 4)The position of the exciter axle center,relative to the center of gravity of the vibrating screen,is ex

52、tremely important for screening efficient.Thus,we can design a vibrating screen with higher processing capacity without increasing power consumption by adjusting the relative position of the axle center.This is a point that requires further study. References [1]Wen B C,Liu F Q.Theory and Applicati

53、on of Vibration Machines.Beijing:China Machine Press,1982. [2]Gu Q B,Zhang E G.Study on complex-locus vibration screen.Mining&Processing Equipment,1998(1):42–46. [3]Hao F Y.Coal Preparation Manual:Technology and Equipment.Beijing:China Coal Industry Publishing House,1993. [4]Yan F.Screening Machi

54、nes.Beijing:China Coal Indus-try Publishing House,1995. [5]Liu C S,Zhao Y M.Study on nonlinear characteristics of single particle on screening surface.Mining&Processing Equipment,1999(1):45–48 [6]Tao Y J,Luo Z F,Zhao Y M.Experimental research on desulfurization of fine coal using an enhanced centr

55、i- fugal gravity separator.Journal of China University of Mining&Technology,2006,16(4):399–403. [7]Zhang E G.Screening,Crushing and Dewatering Equipments. Beijing: China Coal Industry Publishing House,1991. [8] Khoury D L.Coal Cleaning Technology .USA:Noyes Data Corporation,1981. [9]Shang N X,Na

56、 J F.2TYA1842 elliptical vibration screen. Mining&Processing Equipment,1990(2):20–24. [10]YeHD.Elliptical isopachous screening technology andits application.Sintering and Palletizing,1999,5(3):30–33. [11]Wen B C,Liu S Y,He Q.Theory and Dynamic Design Method of Vibration Machines.Beijing:China Mac

57、hine Press,2001. [12]Wang F,Wang H.Screening Machines.Beijing:China Machine Press,2001. [13]Ni Z H.Vibration Mechanics.Xi’an:Xi’an Jiaotong University Press,1989. [14]Zhu W B.Working principle and computer simulation of vibrating screen with complicated motion trace.Mining &Processing Equipment,2004(10):34–36. [15]Peder M.The mogensen E-series—a new screening oncept.Mineral Processing,1996,7(37):311–315. [16]Wen B C.Synchronization theory of self-synchronous vibrating machines with ellipse motion locus. Boston:American Society of Mechanical Engineers,1987:495–500. 19