機電專業(yè)外文翻譯---研究基于小波變換的直線電機驅(qū)動系統(tǒng)

1、<p><b>　　附錄A</b></p><p>　　Research on Linear Motor Driving System</p><p>　　Based on Wavelet Transform</p><p><b>　　Abstract</b></p><p>　　end

2、-effect is a main reason of influence on the characteristic of linear motor driving system, its direct impact is nonstable and undulate edges magnetic field. the wavelet transform is applied to analyze the linear motor d

3、riving system performance in this paper. The improving thrust response system has been presented based on choice wavelet function and wavelet transform. Simulation results indicate that the proposed control strategy can

4、abate the thrust ripple problem caused by end effect in l</p><p>　　Keywords wavelet transform; Linear motor; End effect； Direct thrust control system </p><p>　　Introduction</p><p>　

5、　France physicist Morlet first applied the wavelet to analyzing the partial characteristic of earthquake wave in 1984. Because wavelet transform is a kind of analysis method for time-scale (frequency) signal, in time-dom

6、ain and frequency-domain, which has the ability of exploring signal features with partial characteristic. Therefore, in the last years, the special analysis method has made itself theories rapid development and extensive

7、 application, especially in the aspects of signal analyzing a</p><p>　　Linear motor has longitudinal edge and transverse edge, for this reason the linear motor exist special end-effect. Longitudinal end-effe

8、ct is caused by finite length primary iron-core. Transverse end-effect is caused by finite width of primary and secondary, secondary current and secondary plates affecting the air-gap magnetic field. This is the main dif

9、ference between the linear motor and the rotating machine. Longitudinal end-effect not only causes motor losses, lower electric efficiency and t</p><p>　　Traditional analysis method, Fourier transform, has l

10、ocalization contradiction of time-domain and frequency-domain, some messages while analyzing nonstable signal will be usually lost. Therefore, it is necessary to research a new method that can solve this problem reasonab

11、ly and effectively so as to improve linear motor driving system performance.</p><p>　　Single dimension continuous wavelet transform has higher sensitivity, stronger ability of denoising and lower demand of t

12、he input signal, and doesn’t need objects mathematic model. The single dimension continuous wavelet transform is used for analysis the performance of linear motor driving system.</p><p>　　single dimension co

13、ntinuous wavelet transform</p><p>　　The continuous wavelet sequence can be described as, </p><p><b>　　(1)</b></p><p>　　where is scale parameter， is shift parameter.

14、 The square-integrable function is called Mother Wavelet. A wavelet sequence can be obtained by dilation and shift transformation of the mother wavelet. The continuous wavelet transform of arbitrary function is expresse

15、d by (2).</p><p><b>　　(2)</b></p><p>　　the mother wavelet formed wavelet sequence has an observable window function, so should satisfy following constraint condition:</p>&l

16、t;p><b>　　(3)</b></p><p>　　is a continuous function which must be zero at the initial point for satisfying (2), then,</p><p><b>　　(4)</b></p><p>　　And its

17、Fourier transform is , when fulfills the admissible condition: </p><p><b>　　(5)</b></p><p>　　It is shown that single dimension continuous wavelet transform uses both scale dilatio

18、ns and time shifts to analyze the signal. The signal is expanded in window area []*[], where and represent the time-span and the frequent-span of window respectively. The time-frequency analysis is multi-resolution if

19、varying the window area. The high frequency signal is suitably analyzed by the gradually exquisite time step, and the low frequent signal is finely analyzed by the exquisite frequency step. Th</p><p>　　Concl

20、usions</p><p>　　Comparing with the Fourier transform analysis method, the wavelet transform technique has the characteristics that it analyzes the signal combining time domain with frequency domain together,

21、 for this reason it can effectively solve the problem of time-domain and frequency-domain limitation. It is important to search a new method that can solve the problem in linear motor driving system so as to improve line

22、ar motor servo characteristic. Through correct choice wavelet function, it is possible to</p><p>　　References</p><p>　　Liu Lili, Xia Jiakuan and Jiang Ping. Study on the end effect and compensat

23、ion technique of permanent magnetic linear synchronous motor. Journal of Shenyang University of Technology. Vol. 27, pp.261-266, 2005. </p><p>　　S. Nornaka, “Simplified Fourier Transform Method of LIM Analys

24、es Based on Space Harmonic Method”, Linear Drives for Industry Application, pp.187-190, 1998. </p><p>　　Yoshihiko. Mori, “End-effect Analysis of Linear Induction Motor Based on the Wavelet Transform Techniqu

25、e”, IEEE Transactions on magnetics, 35(5), pp.3739-3741, 1999.</p><p>　　Li. haodong, “Research on the End-effect and Control of the PM Linear Motor Used in the Electric Discharge Machining”, Shenyang univers

26、ity of technology, 2003.</p><p>　　Guo. Qingding and Wang. Chengyuan and Zhou. Meiwen and Sun. Yanyu, “precision control of linear AC serve system”, China Machine Press, pp.30-37, 2000.</p><p>　

27、　Hu. Changhua, Li. Guohua, and Liu.Tao, “The system analysis and design based on MATLAB6.X- wavelet transform”, Xi’an university of electron science & technology press, pp.15-17, 2004.</p><p>　　Liu Lifen

28、g. Research of Direct Thrust Force Control System of Linear Motor Based on DSP. Shenyang University of Technology. 2005.</p><p>　　研究基于小波變換的直線電機驅(qū)動系統(tǒng)</p><p><b>　　摘要</b></p><

29、;p>　　年底效應(yīng)是一個主要的原因的影響的特點，直線電機驅(qū)動系統(tǒng)，其直接影響是nonstable和起伏的邊緣磁場。小波變換是適用于分析直線電機驅(qū)動系統(tǒng)的性能在這方面的文件。改進推力響應(yīng)系統(tǒng)已提交的基礎(chǔ)上選擇小波函數(shù)和小波變換。仿真結(jié)果表明，所提出的控制策略，可以減輕推力紋波問題所造成的端部效應(yīng)在直線電機控制系統(tǒng)，使系統(tǒng)具有良好的性能。</p><p>　　關(guān)鍵詞 小波變換;直線電機;月底效應(yīng);直接推力控制系

30、統(tǒng)</p><p><b>　　簡介</b></p><p>　　法國物理學(xué)家，第一次申請的Morlet小波分析部分的特點，地震波在1984年。因為小波變換是一種分析方法的時間尺度（頻率）信號，在時間域和頻域，其中有能力探索信號特征與局部特征。因此，在過去的幾年中，特別分析方法，取得了理論本身的迅速發(fā)展和廣泛應(yīng)用，尤其是在方面的信號分析和圖像處理的領(lǐng)域。直線電機有縱向

31、和橫向邊緣的邊緣，為此，直線電機存在特別月底生效。縱向月底的效果是有限所造成的長度小學(xué)鐵芯。橫向月底的效果是有限所造成的寬度，小學(xué)和中學(xué)，中學(xué)和中學(xué)目前的板影響氣隙磁場。這是主要區(qū)別直線電機和旋轉(zhuǎn)機械?？v向年底效應(yīng)不僅造成汽車損失，降低電力的效率和推力，但也導(dǎo)致電機工作特性惡化。因此，關(guān)鍵因素是分析縱向邊端效應(yīng)在這方面的文件。傳統(tǒng)的分析方法，傅立葉變換，有本地化的矛盾的時域和頻域，一些訊息，而分析nonstable信號通常會丟失。因此，

32、有必要研究一種新方法可以解決這個問題的合理和有效，從而改善直線電機驅(qū)動系統(tǒng)的性能。 單維連續(xù)小波變換具有較高的靈敏度，能力較強的降噪和需求較低的輸入信號，不需要對象的數(shù)學(xué)模型。單維連續(xù)小波變換用于分析的表現(xiàn)，直線電機驅(qū)動系統(tǒng)。</p><p>　　單維連續(xù)小波變換連續(xù)小波序列可以被形容為</p><p><b>　　(1)</b></p><p&

33、gt;　　那里是尺度參數(shù)，是轉(zhuǎn)移參數(shù)。方積函數(shù)是所謂的母親小波。小波序列可以得到擴張和轉(zhuǎn)移轉(zhuǎn)化的母親小波。連續(xù)小波變換的任意函數(shù)是所表示的（ 2 ） 。.</p><p><b>　　(2)</b></p><p>　　母親小波形成小波序列有一個看得見的窗函數(shù)，所以應(yīng)滿足以下約束條件：</p><p><b>　　(3)</b&

34、gt;</p><p>　　是一個持續(xù)不斷的功能，必須在零初始點滿足（ 2 ） ，那么，</p><p>　　(4) </p><p>　　和其傅立葉變換是，當(dāng)符合受理條件:</p><p><b>　　(5)</b></p><p>　　這表明單維連續(xù)小波變換

35、的用途都是隨規(guī)模和時間的變化來分析信號。信號是擴大在窗口地區(qū)[]*[], ，在何處及所代表的時間跨度和頻繁的大跨度的窗口。時間，頻分析是多方面的決議，如果在不同的窗口地區(qū)。高頻信號是適當(dāng)?shù)姆治觯鸩骄碌臅r間步，和低頻繁的信號是經(jīng)過仔細分析，精美的頻率步進。在Windows的時間和頻率的調(diào)整，通過改變信號的頻率。時頻局部化分析的信號是可以實現(xiàn)的。</p><p><b>　　結(jié)論</b>&l

36、t;/p><p>　　比較與傅立葉變換分析方法，小波變換技術(shù)的特點，分析了信號相結(jié)合的時域與頻域兩者合計，為此，它可以有效地解決問題的時域和頻域的限制。這是很重要的要搜索的一種新方法能夠解決的問題，在直線電機驅(qū)動系統(tǒng)，從而改善直線電機伺服特性。通過正確的選擇小波函數(shù)，這是可以考慮雙方的頻譜母親小波的特點和原始信號。結(jié)果，信號分析是有利于緩和年底效應(yīng)的影響，直線電機驅(qū)動系統(tǒng)。仿真結(jié)果表明，所提出的控制策略，能夠合理和有