dynamical stability 中文意思是什麼

Stability analysis of a non - linear dynamical system with cubical terms

一類帶立方項的非線性動力系統解的穩定性分析

The equations of the mean value functions and the covariance functions are established for dynamical systems whose inputs are fuzzy stochastic processes. an existence and uniqueness theorem of ito fuzzy stochastic differential equations is proved, some explicit representations of solutions and the equations of statistical characteristics are deduced for linear fuzzy stochastic differential equations, and numerical methods to nonlinear fuzzy stochastic differential equations are proposed, the conditions for stability and observability of fuzzy linear systems are derived. the kalman filter algorithms of linear fuzzy stochastic systems are brought forward

主要成果包括：提出了模糊隨機變量協方差和反向協方差的概念；研究了二階模糊隨機變量的均方收斂性，並在此基礎上得到了均方模糊隨機分析、平穩模糊隨機過程及其譜分解的若干定理；根據均方模糊隨機分析理論，得到了輸入為模糊隨機過程的線性系統的輸出輸入統計特徵關系方程；證明了ito型模糊隨機微分方程解的存在唯一性，並給出了ito型線性模糊隨機微分方程解的表達式，統計特徵方程以及非線性模糊隨機微分方程的數值解法；得到了模糊線性系統的穩定性和可觀性條件、線性模糊隨機系統統計特徵方程和線性模糊隨機系統的kalman濾波演算法；研究了當觀測值是模糊數據時，線性回歸模型的建立。

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。

This thesis studies the stability criteria and applications of two classes of retarded dynamical systems, which are linear differential - difference systems of retarded type with two delays and neutral type with multiple delays

本文研究了以下兩類時滯動力系統的穩定性準則及應用：兩時滯時滯型和多時滯中立型線性微分-差分系統。

Four prestressed projects set with two different basis was compared the static force stability, the prestressed project of less internal fore and displacement was obtained. according to this project, three projects of different cable form were given to compare the structural static stability, overall stability and dynamical stability

在此方案的基礎上，確定了三個不同的布索方案，進行靜力、整體穩定和動力性能比較，得到了布索圈數對結構靜力性能、整體穩定性能和動力性能的影響。

In this paper, through the self oscillation analysis and the earthquake response analysis, the frequency, the oscillation mode, the transverse and vertical earthquake response of the different cable form projects and the relevant single - layer spherical latticed shell were compared, the effect of different cable form projects to the structural dynamical stability was obtained

本文對選定的三個布索方案進行了自振特性分析和地震響應分析，比較了各方案的頻率、振型以及橫向和豎向地震反應，並和相應單層球面網殼進行了對比，得到了布索圈數對結構動力性能的影響。

A powerful tool of dynamical system analysis named normal form method is presented in this dissertation, and then it was used to analyze oscillation phenomena in interconnected power grids. using nonlinear coordinate transformation of normal forms, a fully described power system can be converted to an equivalent reduced order model, which can still use the conventional modal analysis of small signal stability problems

論文將動力系統非線性分析的正規形理論應用於互聯系統低頻振蕩分析中，利用正規形方法的非線性坐標變換，將高階電力系統轉化為等價的低階系統，在保留非線性信息的同時，使其仍然可以使用常規小信號穩定研究的模式分析方法。

Using the comparion theorem of difference equation, persistence theorem of discrete semi - dynamical system and stability of monotonous operator, we gain the boundary, uniform persistence and permanence of the system

應用差分方程的比較原理，離散半動力系統的持久性定理以及單調運算元的三分穩定性，獲得系統的有界性，一致持久性，永久持久性。

Dynamical stability of mechanism system

機構系統的動力學穩定性研究

Nonlinear dynamical systems ; nonlinear waves ; diffusion ; stability ; characteristics ; nonlinear steepening, breaking and shock formation ; conservation laws ; first - order partial differential equations ; finite differences ; numerical stability ; etc

非線性動力系統；非線性波；擴散過程；穩定性；特徵值及特徵曲線；非線性陡斜，阻斷和激波的形成；守恆定律；一階偏微分方程；有限差分；數值穩定性等等。

In this paper, the suspen - dome structure of the gymnasium for olympic badminton game in 2008 was used for example. three projects of different cable form was analyzed the static stability, overall stability and dynamical stability. in this paper, the basis of setting prestress for large span suspend - dome was discussed first

本文以我校奧運羽毛球比賽館的弦支穹頂屋蓋結構（跨度93米）為工程應用對象，採用大型通用有限元分析軟體ansys ，選擇不同的布索方案進行了靜力、整體穩定和動力性能分析。

The main contents are given as following : firstly, the existing sensitive analysis is analyzed in detail, and the thought of applying the trajectory sensitivity in transient stability analysis and dynamical security control is proposed

論文的主要內容如下： （ 1 ）詳細分析了現有靈敏度分析方法的不足之處，得出軌跡靈敏度分析方法適合於電力系統暫態穩定分析和動態安全控制。

Two illustrative examples, a duffing oscillator subject to a harmonic parametric control and a driven murali - lakshmanan - chua ( mlc ) circuit imposed with a weak harmonic control, are presented here to show that the random phase plays a decisive role for control function. the method for computing the top lyapunov exponent is based on khasminskii ' s formulation for linearized systems. then, the obtained results are further verified by the poincare map analysis on dynamical behavior of the system, such as stability, bifurcation and chaos

通過兩個實例，即一類參激激勵作用下的duffing系統和一類murali - lakshmanan - chua （ mlc ）電路，考察隨機相位在非反饋混沌控制中的影響與作用，利用最大lyapunov指數和poincare截面分析法證實了隨機相位確實可以用來調節系統的混沌行為，即一個小的隨機相位的擾動可能導致系統從有序轉變為無序，也可能使得系統從無序轉變為有序。

Impact oscillator is an important model of nonsmooth dynamical system. in this article, we study the dynamics of elastic imapact oscillators. we will consider the asymptotically linear oscillator and study it in two parts : the existence of periodic bouncing solutions ; the lagrange stability of impact motion

碰撞振子是非光滑動力系統中一類重要模型，本文討論彈性碰撞振子的動態行為，主要考慮漸近線性振子的碰撞解，文章分兩部分：周期碰撞解的存在性；碰撞運動的lagrange穩定性。

Rural governance is the dynamical activities and process of achieving the rural stability and development through settling rual questions

摘要鄉村治理是通過解決鄉村面臨的問題，實現鄉村的穩定和發展的動態活動過程。

Under the influence of dynamical factors such as earthquake and storm surge, the sediment failure on the submarine slope might be triggered to make considerable damage to the submarine structures, so more and more attention has been drawn to the submarine slope stability in recent years

摘要海底斜坡物質受地震、風暴潮等動力因素的影響，其強度變弱，發生失穩破壞，對海底工程設施具有較大的破壞性，引起人們的廣泛關注。