multi- grid method 中文意思是什麼

multi- grid method 解釋
多重網格法
  • multi : 並聯的,多路系統
  • grid : n 1 格子,格柵。2 (蓄電池的)鉛板。3 【無線電】柵級。4 鐵道網;【電學】電力網;〈英國〉(全國)...
  • method : n 1 方法,方式;順序。2 (思想、言談上的)條理,規律,秩序。3 【生物學】分類法。4 〈M 〉【戲劇】...
  1. A highly efficient numerical algorithm by using multi - grid method ( mgm ) is introduced to solve the three dimensional field distribution in the present paper. formulae of the restriction and prolongation in mgm computation is deduced, and a 3d program of mgm is accomplished, which can solve the field distributions in electron optical systems for various electrostatic lenses. the 3d field distribution in an electrostatic concentric spherical model is tested with mgm algorithm and an algorithm based on finite difference method ( fdm ) respectively. comparing these two results in view of computational efficiency and computational accuracy, it appears that mgm is superior to fdm in solving electrostatic field distribution for the electron optics problem. this paper shows that the 3d field computation using mgm greatly improves the computational efficiency of field distributions in electron optical systems and shortens the computational time

    本文將一種高效率的數值計算方法? ?多重網格法引入三維靜電場分佈的計算,多重網格法利用限制和延拓可迅速求得滿足精度要求的場分佈.研究了求解各種靜電透鏡電子光學系統三維場分佈的多重網格法程序,驗算了靜電同心球模型的三維場分佈.通過與目前在場計算中常用的有限差分法進行比較,可以看出多重網格法的計算效率和計算精度優于有限差分法.本文表明利用多重網格法計算三維場大大提高了場分佈的計算效率,縮短了計算時間,因此為后續計算打下了良好的基礎
  2. Many test cases are calculated to verify the above study. the cases are either real or standard testing models, including multi - element airfoil, wing - body configuration, cone / cylinder missile model and 3 - d high - lift systems, etc. the results of present calculation are in good agreement with experiment data, and show flexibility and accuracy of the approaches. base on the cartesian grids, this thesis has targeted the development and integration of many algorithms and techniques such as adaptive refinement, omni - tree data structure, hybrid grid method, etc. an analysis software and research methods are designed and developed for the steady - unsteady and viscous - inviscid flow complex systems and configuration

    7 .運用上述研究成果和結論,進行了大量算例的實驗驗證,外形范圍包括多種標模與型號,涉及多段翼型、 m6機翼、細長體模型、翼身組合體、兩段機翼增升標模、帶縫翼和襟翼的三段增升翼身組合體等復雜外形,計算結果均與實驗吻合良好,充分說明了本文發展的各種演算法、流場求解、網格生成方法的正確性和魯棒性。
  3. This paper discusses every kind of risk in laws, management system, personnel, market structure, infrastructure, emergency system, safety management, combines the active safety evaluation methods with risk conception, and brings a method of multi - stage fuzzy comprehensive evaluation and gives detailed numerical examples. the systematic way of risk control to is put forward in safety evaluation dynamic management system, law system, management system, economic method, personnel, scientific method, revolution relationship and grid construct, and according to inland and outland status, a management system of " three standards together " is also presented to give consult in the safety management of the grid enterprises in our country

    從法律法規、管理機制與人員素質、市場結構、基礎設施、應急機制等多個方面系統論述了電網企業在安全管理中所面臨的各種風險;基於當前電力企業中所採用的安全性評價方法,將現有方法與風險理念相結合,提出了安全評價的多級模糊綜合評價方法,通過算例進行了的說明;針對風險識別中得出的電網企業所面臨的多種風險,分別從安全性評價動態管理體系、法律體系、管理體系、經濟手段、人員素質、科技手段、改革關系和電網建設等多個方面提出了系統的風險控制辦法,並結合國際、國內的現狀提出了「三標一體」的管理體系,以期對我國電網企業的安全管理工作提供一定的參考。
  4. Three finite - difference methods, i. e., stagger grid, implicit and explicit algorithms, are analyzed in detail. multi - grid algorithm is firstly introduced in elastic wave simulation, to solve for the stability problem inherent in stagger grid and implicit algorithm, also for the efficiency problem inherent in explicit algorithm, and the precision, stability and efficiency for simulation of elastic wave arc increased by multi - grid method. phase - delay method is provided to effectively absorb boundary reflection and increase efficiency for wave motion simulation, based on phase delay and amplitude decaying features along wave propagation

    在水平分層介質接收函數的波形反演研究的基礎上,本文系統闡述了非均勻介質中彈性波傳播數值模擬常用的三種有限差分方法:顯式差分、隱式差分和交錯網格法,首次將多重網格演算法應用於彈性波方程的數值模擬問題,克服了交錯網格法和顯式差分法穩定性差,以及隱式差分法計算效率低的缺點,大大提高了彈性波數值模擬的精度、穩定性和計算效率。
  5. A computational method is developed with couples the governing equations of the unsteady flow field and the rigid - body dynamics in six degrees - o f - freedom. 6. facing the complex multi - element and high - lift configuration, a series of methods including multi - zone algorithm and face - to - face technique is developed to lower down the great difficulties of grid generation and finish flow calculation of high - lift system with the dual - time method

    採用基於自適應直角切割網格的分區面搭接方法,結合隱式雙時間推進演算法,實現了三維復雜增升裝置繞流的euler方程數值計算,發展了對存在不連續面的高陞力系統外形進行流場計算的一種方便、實用、高效的三維增升裝置繞流計算方法。
  6. Genetic algorithm and multi - grid technique applied to two - step linear inversion method

    遺傳演算法和多重網格在兩步線性反演中的應用
  7. Making full use of the correlated space information of multi - beam bathymetric data, the author put forward a method of gaussian surface approximation to build the grid net of regular digital terrain model ( dtm ) of surveyed seafloor, which is more accurate than other approximation methods

    本文充分利用了多波束數據的空間相關信息,提出了一種基於高斯地形曲面擬合的數字地理模型數據網格化方法,準確快速地得到標準等深線圖。
  8. This thesis is to present and analyze one class of regularized multi - grid algorithms ( rmga ) for solving operator equations of the first kind. the rmga employs tikhonov ' s regularization to solve the corase grids equations with a new choicing parameter ' s posteriori - method for improving the numerical stability, and adopts a new smoothing strategy to correct the solutions on the fine grids for preserving the high efficiency of mgm. meanwhile, some key technical problems in the process of implementation of rmga are disscussed

    本文將提出一類適合第一類運算元方程的正則化的多重網格演算法,它結合一種新的正則參數選取準則,應用tikhonov正則化來求解粗網格方程保證了求解的穩定性;而在將解向細網格延拓時使用了一種新的光順處理策略。
  9. Multi - grid - blocks, finite volume method, maccormack difference method was used to solve the unsteady two - dimensional navier - stokes equation, finite difference method was used to solve the two - dimensional heat transfer problem

    數值計算方面,以多塊網格為特徵的s2df程序採用有限體積法, maccormack離散格式求解二維、非定常n - s方程,利用有限差分方法求解二維熱傳導方程。
  10. This paper put forward the realization method of a kind of multi - function general use inverter system which added other functions based on the independent sine wave inverter, it not only can be used as independent inverter power supply but can be used as an in - support mode ups which realize synchronous with the phase of power grid voltage and realize to switch with power grid mutually, it also can realize three phase ac output by the combination of three synchronous inverters, experiment proved it in this way has a stronger ability of resisting three phase unbalance load

    本文提出了一種基於獨立正弦波逆變器的功能之上復合其他功能而成的多功能通用逆變電源系統的實現方法,此系統不僅可以作為獨立逆變電源使用,還可以與電網電壓的相位同步,作為后備式正弦波ups使用,在逆變電源和電網的相互切換時能做到對負載無影響,同時還可以由三臺逆變器進行組合自同步實現三相對稱交流輸出,實驗證明這種方式具有較強的抗三相不平衡負載的能力。
  11. In this article, the wavelet transform is used to improve the recognition ability of vehicle ' s characters recognition system, because the " microscope " feature and similar - human vision feature can be used in the image analyze. three problems have been solved in this article : ( l ) the core method of recognition is to realize the extraction of stable feature of characters, the algorithm of wavelet feature vector has been given based on the directivity decompose of 2 - dimention wavelet transform, varied grid feature vector has been built too according to the multi - mode owned by the characters

    本文選用小波變換作為數學工具,利用小波的「顯微鏡」特性和類人視覺特點解決車牌字元的分析和識別問題,以提高車牌字元的識別能力,主要研究了三個方面的問題: ( 1 )識別研究方法的核心是完成字元穩定性特徵的提取,採用圖像小波變換的方向性分解構造出小波特徵向量,並根據字元本身具有的多模態性提出了一種變網格小波特徵向量。
  12. With the reference on the idea of management by objectives and trait of performance target, the determination of financial goal was analyzed by using the method of problem analysis, and the determination of managers " performance objects was also analyzed by using game theory with incomplete information. according to the methods of multi - objects optimization and the theory of invigoration, the principle of designing performance invigoration and the mechanism of mutual action of performance object and invigoration in provincial grid corporation were put forward

    借鑒目標管理的思想、考察效績目標的特性,並運用問題分析的方法,剖析了省級電網企業財務目標確定的思路;運用不完全信息靜態博弈理論分析了經營者業績目標確定的過程;依據多目標優化與激勵的方法,結合相關激勵理論的研究,提出了效績激勵機制設計的原則;概括提出了省級電網企業效績目標與效績激勵的互動機理。
  13. Multi - grid method

    多重網格法
  14. Then the explicit finite - volume method for the two - dimensional steady navier - stocks equations is studied. in order to prevent odd - even decoupling of the solution and oscillations near the shock waves, artificial dissipation is added. local time step, residue averaging, enthalpy damping and multi - grid method are used to accelerate the convergence during the five - step runge - kutta explicit time marching

    在計算中,採用五步runge - kutta顯式時間推進,引進人工耗散項以克服中心差分固有的奇偶不關聯性和抑制激波附近解的振蕩,應用了當地時間步長、殘值光順、焓阻尼、多重網格法等措施加速計算收斂。
  15. A patent has been applied for based on these widely used innovations. a 3d particle velocity measurement system was built upon calibration method of multi - layer regular grid and particle space coordinates determination method of iterative approaching developed in this paper

    建立了顆粒三維運動測量系統,提出了「空間多層正交網格」的標定方法,用「多次迭代逼近法」進行顆粒空間坐標的計算。
  16. The navier - stokes equation is discretized in the moving - grid system. by adopting the explicit four - stage runge - kutta jameson finite volume scheme, and under the sustainment of acceleration algorithms such as dual - time stepping method, the multi - grid strategy and implicit smoothing of the residuals, a two dimensional unsteady viscous flow in vibrating cascades is simulated

    本文在運動網格體系中離散n - s方程,應用runge - kutta四步顯式的jameson有限體積格式,並在雙時間方法、多重網格法及殘差光順等加速演算法的支持下,計算了二維振動葉柵非定常粘性流場。
  17. Grid generation is a pivotal technology of cfd ( computational fluid dynamics ). follow the complication of problem in cfd field, the grid generation technology has developed in two ways : in the first place, it improved grid generation method to adopt the increasingly complicated figuration ; on the other hand, it developed new methods to deal with the problem including fluctuant surface, such as multi - body separation problem etc. among this ways, the overlap grid technology is a vive research aspect

    網格技術是cfd ( computationalfluiddynamics )領域中的關鍵技術。隨著cfd涉及問題的復雜化,網格技術在兩個方向上逐步發展:一方面針對不斷復雜的外形處理需求改進網格方法,從而能夠模擬復雜飛行器及其各個氣動部件的細節;另一方面發展適應撲翼、多體分離等變幾何外形問題的網格方法,使得cfd的工程應用領域不斷拓寬。這其中,重疊網格方法是一個較有活力的研究方向。
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