暫定樣機 的英文怎麼說

中文拼音 [zhàndìngyàng]
暫定樣機 英文
provisional mockup
  • : Ⅰ形容詞(時間短) short; momentary Ⅱ副詞(暫時) temporarily; for the moment; for the time being
  • : Ⅰ形容詞1 (平靜; 穩定) calm; stable 2 (已經確定的; 不改變的) fixed; settled; established Ⅱ動詞...
  • : Ⅰ名詞1. (形狀) appearance; shape 2. (樣品) sample; model; pattern Ⅱ量詞(表示事物的種類) kind; type
  • : machineengine
  • 暫定 : arranged for the time being; tentative; provisional
  1. The stability of electric power system has been being focused for a long time toprevent a power system from losing synchronism after sudden fault , researchers have done much work and got many accomplishments this paper applied the direct feedback linearization ( dfl ) technique on the power system , a strong nonlinear system simulation results by matlab proved this method efficiency main works and results are as follows : this paper compared some existing methods in excitation control , fast valve control and coordinated control respectively, analyzed the developments and actuality of nonlinear control research in brief, illustrated why ransient stability could be greatly improved by using the fast valve control in chapter 3 , indicated the importance of coordinated control farther this paper introduced the inverse system theory, based on which , discussed the dfl theory, pointed out which had consistency with the inverse theory, expanded the dfl theory combined the idiographic model equations , made which adapt to the model of a single machine - infinite bus power system this paper referenced abundance articles and educed a set of equations , which could describe the dynamical process of excitation and fast valve control for synchronous generators in the equations , there were several very important parameters of power system - - rotor angle ( ) , rotor speed ( ) , generator q axis voltage ( eq ) , transient voltage ( e ' q ) , active power ( pe ) , mechanical input power ( pm ) , valve opening ( ) , generator terminal voltage ( vt ) , based on the model , nonlinear coordinated controller and terminal voltage optimal controller have been designed by using the expanded dfl theory and lq optimal control theory the simulation results showed that the controller could keep power system transiently stable under the effects of a symmetrical 3 - phase short circuit fault , which achieved better postfault regulation compared with another two routine methods , one is the proportion excitation controller and proportion fast valve controller, the other is the proportion excitation controller and the optimal fast valve controller, which could exert good performance when met 1ittle disturbance either

    在介紹逆系統理論的基礎上,詳細介紹了dfl理論,通過比較闡明了dfl理論其本質是逆系統方法的一類,並結合具體課題推導出的模型方程將dfl理論進行了擴展,使之適應于電力系統這個強非線性對象。通過參考大量的書籍文獻推導出一套實用的可將大型汽輪發電勵磁與汽門綜合起來進行控制的模型方程,此模型方程涵蓋了電力系統中特別引人注目的幾個量- -轉子角、轉子轉速、發電q軸電勢eq 、態電勢e ' q 、有功功率pe 、械功率pm 、汽門開度、端電壓vt ,在此基礎上建立了實用的電力系統簡化的數學模型,並將擴展的dfl理論應用於此模型系統,結合線性二次型最優控制理論設計出大型汽輪發電的非線性綜合控制器及端電壓最優控制器,通過模擬實驗與採用常規的按電壓偏差進行調節的比例式勵磁控制器+汽門比例控制及採用常規的按電壓偏差進行調節的比例式勵磁調節器和基於二次型性能指標設計的最優快控汽門(考慮發電的飽和因素)進行了對比,證實了採用此種控制器可以有效地提高電力系統的態穩性,並且在電力系統遭受小干擾時同具有良好的調節性能。
  2. This paper proposed some methods for finding out sure regions and ambiguous regions defined by lower and upper approximations in rough set theory. an applicable ending - criterion for semi - supervised back - propagation algorithm was proposed and a new rough classifier framework was studied, the assessment results show the effectiveness of the proposed criterion. a new classifier based on support vector machines was studied and applied

    本文提出了幾種劃分本邊界區的方法:提出了一種應用於半監督bp演算法的實用結束判據,並根據粗糙集理論,研究了一種新的粗糙分類制,取得良好的效果;應用支持向量理論,構造分類器並劃分本邊界區;最後研究多個分類器集成的方法尋找本邊界區,同提高了態穩評估的可靠性
  3. Against a prototype which is being produced , its three dimension end region entity model of stator is established , and with the aim of simplifying calculation , the theory of how to simplify entity model is studied , then the theory is made use of , and the end region entity model of stator is simplifi - ed ; meshing characteristics of three dimension entity model and shortcomin - gs of end region entity model of stator are studied , then meshing method of three dimension end region entity model of powerformer stator is studied as well , and the simplified entity model is meshed with this meshed model , the distribution of end region magnetic field of stator is analyzed , and the magnetic field energy and reactance of powerformer end region are calculated and compared with design value because the prototype is being produced , in this paper , stator core , gap and eddy equipment are not taken into consideration , and this has a little influence on the result , but through analysis , the result is proved to be good through the example calculation , it is known that the method of this paper is useful and through theoretic analysis , it is proved that end region

    針對一臺生產中的,對其建立了子端部三維實體模型,而且為了達到簡化計算的目的,研究了如何將其簡化的理論,並應用這些理論對子端部實體模型進行了簡化;研究了三維實體模型的剖分特點和子端部實體模型存在的缺點,在此基礎之上,研究了對簡化的powerformer子端部三維實體模型的剖分方法,並且對簡化的實體模型進行了剖分。應用剖分的三維實體模型,用有限元法分析了powerformer子端部的磁場分佈,計算了端部區域的磁場儲能,並利用磁場儲能計算了powerformer子端部漏抗,將計算值與設計值進行了比較、分析。由於處在設計生產階段,本文時沒有考慮子鐵心、氣隙和渦流器件對端部磁場的影響,這對分析結果有一的影響,但是仍然得到較好結果。
  4. The former combines enumeration and sample technique and is easy to implement, but only definite failure modes are simulated, which may be inaccuracy with bulk power system in which high order failures and protection failures are the main cause to instability

    基於蒙特卡羅抽的概率穩模擬演算法可以考慮電力系統的高重隨故障,並考慮故障間的相關性。模擬法可以模擬多重、連鎖故障對系統態穩性能的影響。
  5. 5 ) this dissertation presents new predictive models for the transient stability and small signal stability based on support vector machine theory that can solve the problems such as finite samples. a new method of feature selection and sample condensation is proposed to build predictive model which improves the practicability of the model greatly

    5 )論文首次利用基於小本技術的支持向量理論,設計了新的態穩、小擾動穩特徵值預測模型,提出了新的適合預測模型構建的特徵選擇、數據采策略,提高了模型的實用性。
  6. Based on the theory and knowledge, the paper proposes and discusses several robust detectors in detail, such as optimal periodical signal detectors which exploits the prior knowledge that the chi _ square distribution hypothesis test has certain robustness, detectors based on over _ sampled gabor representation for transient signals detection which takes the numerical computational advantage of robustness brought by over _ sampling, and the detector using computer _ intensive method " bootstrap "

    在此基礎上,詳細討論幾種具有一robustness的檢測器,即,基於具有robustness的卡平方假設檢驗的周期信號檢測方法、利用過采的gabor表示的態信號檢測方法以及基於計算強大計算功能的統計學方法bootstrap技術。
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