翻訳と辞書 Words near each other ・ Global Medical Aid ・ Global Medical Device Nomenclature ・ Global Medical Excellence Cluster ・ Global Memory Net ・ Global mental health ・ Global Metal ・ Global meteoric water line ・ Global Methane Initiative ・ Global microbial identifier ・ Global Migration Group ・ Global Mission ・ Global Mission Church ・ Global Mobile Internet Conference ・ Global Mobile Satellite System ・ Global Mobile Suppliers Association ・ Global mode ・ Global Money Week ・ Global Monitoring Plan ・ Global Monitoring Report (World Bank) ・ Global motion compensation ・ Global Movement for Children ・ Global Movie ・ Global Multimedia Protocols Group ・ Global Music Group ・ Global music industry market share data ・ Global Name Registry ・ Global Namespace ・ Global National ・ Global Nature Fund ・ Global Neighborhood Watch Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Global mode ： ウィキペディア英語版 Global mode In mathematics and physics, a global mode of a system is one in which the system executes coherent oscillations in time. Suppose a quantity $y(x,t)$ which depends on space $x$ and time $t$ is governed by some partial differential equation which does not have an explicit dependence on $t$. Then a global mode is a solution of this PDE of the form $y(x,t)\; =\; \backslash hat(x)\; e^$, for some frequency $\backslash omega$. If $\backslash omega$ is complex, then the imaginary part corresponds to the mode exhibiting exponential growth or exponential decay. The concept of a global mode can be compared to that of a normal mode; the PDE may be thought of as a dynamical system of infinitely many equations coupled together. Global modes are used in the stability analysis of hydrodynamical systems. Philip Drazin introduced the concept of a global mode in his 1974 paper, and gave a technique for finding the normal modes of a linear PDE problem in which the coefficients or geometry vary slowly in $x$. This technique is based on the WKBJ approximation, which is a special case of multiple-scale analysis. His method extends the Briggs–Bers technique, which gives a stability analysis for linear PDEs with constant coefficients. ==In practice== Since Drazin's 1974 paper, other authors have studied more realistic problems in fluid dynamics using a global mode analysis. Such problems are often highly nonlinear, and attempts to analyse them have often relied on laboratory or numerical experiment.〔 Examples of global modes in practice include the oscillatory wakes produced when fluid flows past an object, such as a vortex street. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Global mode」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.