次優性 的英文怎麼說
中文拼音 [cìyōuxìng]
次優性
英文
suboptimality-
Therefore, to find the suboptimum detection schemes which have low complexity as well as good performance close to mld is the main problem of mimo signal detection
因此，低復雜度、逼近mld性能的次優信號檢測演算法一直是mimo信號檢測所要解決的問題。The teaching strategy has many good characters, such as the pertinency, maneuverability, selectivity, processiveness, flexibleness and so on
教學策略具有目標指向性、針對性、可操作性、擇優性、過程性、整體綜合性、層次性和靈活性等特點。The improvement plan for the right bank revetment of the first - step stilling basin for the normal spillway of huangbizhuang reservoir is optimized for many times, which has met the requirements to save the investment, shorten the construction period, guarantee the continuity of the boundary and satisfy the operation of the project at last
摘要黃壁莊水庫正常溢洪道一級消力池右岸躺坡改建方案經過多次優化，達到了節約投資、縮短工程工期，保證了邊界的連續性，滿足工程運用要求。Abstract : it provides a kind of new nonlinear integrator and its mathematical model. its frequency responses is disscussed by the harmonics linearization method. its phase lag is found to be only 27. 6, all high order harmonics are very small, and it is very resistant to disturbances. by using it, an two - objective optimum control system is designed. it has very good control performances and will have good prospects in application
文摘:提出一種新型的非線性積分器，給出它的數學模型，並用諧波線性化原理討論它的頻率特性，其幅頻特性起積分作用，而相位滯后僅27 . 6 ，高次諧波分量小，抗干擾能力強.應用這種積分器設計了一個雙目標優化的二次優化系統.模擬結果表明，系統的控制性能好，具有廣泛的應用前景Basing on the statistical inaming t ' heory ( slt ), the thesis discusses the svm problems in linearly separable case, lineariy non - separable case and non - linear separable case, and induces a convex quadratic programming ( qp ) problem with an equation constrain and non - equation constrains. then one program on solving the op problem is proposed
概述了統計學習理論的主要內容，推導了支持向量機方法在文本線性可分、線性不可分和非線性可分情況下實現分類的數學公式，將學習問題轉化為一個在等式約束和不等式約束下的凸二次優化問題，總結了求解的過程。Pre - differentiation and proper partial desiccation of calli before transferred to regeneration medium was found to apparently improve the frequency and quality of plant differentiation. with our optimized culture condition and treatment style, induction frequency of pei ' ai64s and 9311 can be reached 62. 45 % and 85. 30 % respectively and after 3 months of subculture calli can remain high - quality embryogenic state, when high - quality embryogenic calli after two times of subculture were used as acceptor, callus differentiation frequency can arrive at 85. 5 % and 87. 7 % respectively
採用我們優化后的培養條件與處理方式，培矮64s和9311愈傷組織的誘導頻率分別可達到62 . 45和85 . 30 ；繼代培養時間達三個月左右仍能保持較好的胚性生長狀態；對于繼代兩次胚性生長狀態良好的愈傷組織分化頻率分別可達到85 . 5和87 . 7 。Kalman filter is an optimal filter algorithm in the minimum - mean - square - error sense, meanwhile extended kalman filter is a sub - optimal filter algorithm, which derived from the linearization of nonlinear system using taylor expansion. while the non - linearity of the system is not extreme strong, ekf can achieve approximately optimal filter effect
Kf是最小均方意義下的最優濾波演算法， ekf則是利用一階泰勒展開將非線性系統線性化而得到的一種次優濾波演算法，在非線性不是特別嚴重的情況下， ekf有著近似最優的濾波效果。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機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、發電機q軸電勢eq 、暫態電勢e ' q 、有功功率pe 、機械功率pm 、汽門開度、機端電壓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機的非線性綜合控制器及機端電壓最優控制器，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（考慮發電機的飽和因素）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暫態穩定性，並且在電力系統遭受小干擾時同樣具有良好的調節性能。The innovations consist of : synthetically restraining the filter ' s divergence, as effectively improved the filter ' s numerical stability ; a parallel filter structure is creatively designed to eliminate system biases ; and sprt method is used to control the adjustment of the noise statistics, so as to ameliorate the tracking performance of time - variant noises
對常規的次優遞推sage自適應濾波器進行了改造，包括：對濾波結果發散進行綜合抑制，提高了濾波器的數值穩定性；採用并行結構，消除了結果偏差；應用sprt控制調整，增強了濾波器的動態跟蹤能力。In the second methodology, parameterized matrices are taken as the weighting matrices of the quadratic performance index. due to the existence of the relationship between parameterized matrices and control forces, the parameterized coefficients of the weighting matrices can be regarded as the control parameters, and they are taken as one part of the synthesis design variables. since the experimental conditions can not meet the requirement of acoustic measuring, a method based on experiment and simulation analysis is developed
在第二種方法中，以參數化矩陣作為二次型性能指標中的權矩陣，由於參數化權矩陣與機構控制力之間存在的對應關系，可以將權矩陣的參數化系數作為控制系統參數，與結構設計參數一起同時作為獨立的設計變量，對目標函數進行優化分析。In operating process of systems, besides the external randoml disturbance from the, also influence also comes from inside as parameter changing, in order to cope with this two kinds of uncertainties, a minimization variance control strategy based on innovations is proposed rind the analytic solution of this suboptimal control is obtained in this paper
摘要系統在運行過程中，除了受到來自外界的隨機干擾外，還受到了諸如內部參數引起的不確定性的影響，為對付這兩種不確定性，採用雙態控制方法，提出了基於新息的最小方差控制策略，獲得了該次優控制律的解析解。La dead reckoning algorithm has been developed based on the doppler velocity log ( dvl ) and fiber optic gyrocompass. 2. since the basic kalman filter will become lapsed, strong tracking filter theory has been inducted, and a new strong adaptive kalman filter algorithm has been developed. further more an adjust gene has been imported, and gets a new arithmetic
針對傳統的卡爾曼濾波演算法中由於噪聲統計特性未知而容易引起的濾波發散的缺點，引入強跟蹤濾波理論，提出了帶次優漸消因子的擴展卡爾曼濾波演算法，並進一步對該演算法進行改善，加入了調整因子，使濾波演算法得到較好的改善。Furthermore, utilizing the characteristic that filtering error covariance expresses filtering precision and the principle of information conservation, the dynamic and reasonable distribution of distributed tracks weight coefficient is accomplished. jerk model and strong tracking filter is organically assembled, and based on spatio - temporal synthetically analysis and lme, a self - learning estimation method of the system measurement variance is given. the method improves obviously the
3 、將jerk模型與強跟蹤濾波演算法有機地結合，並利用時空綜合分析和極大似然估計的思想推導出了一種系統量測方差自學習修正方法，以優化強跟蹤濾波演算法中次優漸消因子和濾波增益的在線選擇，同時根據多傳感器數據融合具有改善濾波精度的性質，進而給出一種基於jerk模型的多傳感器數據融合演算法。4. suboptimal fading ddf ( sfddf ) and suboptimal fading ukf ( sfukf ) algorithm can be obtained with the application of suboptimal fading ekf. suboptimal fading algorithm is an error compensative technology basing on the kalman filter orthogonality principle, which can greatly improve filtering precision and stability
4 、把一種帶次優漸消因子的ekf演算法推廣到ddf和ukf演算法中，得到sfddf和sfukf演算法，次優漸消因子是一種基於kalman濾波正交原理誤差補償技術，它的引入較大的改善了濾波精度和演算法穩定性。For the nonlinear two - point boundary value problem with both time - delay terms and time - advanced terms driven by the optimal control theory, we build a sequence of nonhomogeneous linear two - point boundary value problems according to the successive approximation approach of constant differential equation
再利用常微分方程的逐次逼近法，將由系統的最優控制問題得到的即含有時滯項又含有超前項的非線性兩點邊值問題化為非齊次線性兩點邊值問題族。For a nonlinear system with time - delay, the optimal control problem based on quadratic performance indexes is usually transformed to a nonlinear two - point boundary value problem with not only time - delay terms but also time - advance terms. therefore, this kind of optimal control problem is especially difficult to be solved, no matter exact solutions or numeral solutions
對于帶時滯的非線性控制系統，其基於二次型性能指標的最優控制問題往往轉化為一個既有時間滯后項又有時間超前項的非線性兩點邊值問題，因此解決這一類控制問題尤其困難，不論是求其精確解還是數值解。Under the assuption of generalized subconvexlikeness, the optimality conditions of set - valued optimization problems in linear space are established by using obtained gordan - farkas type alternative theorem. under the assuption of near subconvexlikeness and - generalized convexity, the optimality conditions of set - valued optimization problems in linear topological space are established by using alternative theorem of near subconvexlikeness and obtained farkas - minkowski type alternative theorem. the concepts of super efficient solution and - super efficient solution are defined in normed space, and the optimality conditions of set - valued optimization problems are established under the assuption of semi - preinvexity
在廣義次似凸性假設下，利用已獲得的gordan - farkas型的擇一性定理，建立了線性空間中集值優化問題的最優性條件。在近次似凸和-廣義錐凸性假設下，利用近次似凸集值映射的擇一性定理和已獲得的farkas - minkowski型的擇一性定理，建立了線性拓撲空間中集值優化問題的最優性條件。( 3 ) reactive power optimal of radial network is a very complex nonlinear discrete optimal problem. to ensure the speediness, feasibility and optimality, evolution algorithm is improved by combination with interior point sequence linear optimal algorithm and principle of var balance. the improved algorithm is applied to the reactive power optimization and achieves distinct effect
（ 3 ）配網網路無功優化是一個非常復雜的非線性離散優化問題，為了保證計算結果的快速性、可行性和最優性，本文結合內點法的逐次線性優化方法，以及配網電壓調節的特點，對模擬進化優化方法進行了改進，並將該演算法應用於配網無功優化問題的求解，取得了顯著的效果。( 2 ) reactive power optimal of hv network is a very complex nonlinear discrete optimal problem. to ensure the speediness, feasibility and optimality, evolution algorithm is improved by combination with interior point sequence linear optimal algorithm and expert knowledge of voltage / var adjustment. the improved algorithm is applied to the reactive power optimization and achieves distinct effect
（ 2 ）高壓網路無功優化是一個非常復雜的非線性離散優化問題，為了保證計算結果的快速性、可行性和最優性，本文結合內點法的逐次線性優化方法，以及電壓無功調節的專家經驗，對模擬進化優化方法進行了改進，並將該演算法應用於無功優化問題的求解，取得了顯著的效果。For large errors introduced by nonlinear state - space model in passive locating and tracking problems, various suboptimal recursive filtering algorithms are aralyzed and summarized, such as the extended kalman filtering ( ekf ), the modified gain extended kalman filtering ( mgekf ), the second order filtering and the adaptive extended kalman filtering ( aekf )
摘要針對被動定位跟蹤中狀態空間模型非線性程度較高所引發的濾波精度偏低的問題，分析和總結了已有的包括推廣卡爾曼濾波（ ekf ） 、修正增益的推廣卡曼濾波（ mgekf ） 、二階濾波、自適應推廣卡爾受濾波（ aekf ）等各種次優遞推濾波演算法的特點。分享友人