direct simulation 中文意思是什麼

direct simulation 解釋
直接模擬
  • direct : adj 1 筆直的，一直線的；正面的。2 直接的。3 直截了當的，直率的，明白的。4 直系的，正統的。5 【語...
  • simulation : n. 假裝；模擬；裝病，裝瘋；【生物學】擬態，擬色。
  1. The welding technology of francis turbine runners is optimized from the view of subsection welding and local heating by numerical simulation. the result shows that welding residual tensile stress appears in the weld and its area nearby, and peak stress appears in the dangerous area of blades after practising quondam welding technology ; welding residual tensile peak stress in the dangerous area of blades can be decreased by welding both ends earlier and then welding middle section later during subsection welding, and decreasing effect on welding residual stress of the subsection welding is related to the weld length of blade outlets and welding direction of each subsection ; decreasing effect on residual stress of the local heating is direct proportional to heating time, heating temperature, heating area, and inversely proportional to cooling area, and welding residual tensile peak stress in the dangerous area is decreasing trend earlier, and then increasing trend later with heated location increased

    本文利用數值模擬手段對轉輪的焊接工藝從分段焊和局部加熱兩個方面進行了優化，結果表明:採用普通工藝焊接時，葉片焊后殘余拉應力出現在焊縫及其附近區域，並且在葉片出水邊的熔合線附近（危險區域）出現了峰值;在採用優化的分段焊時，先焊兩端后焊中間的方法可以降低葉片危險區域的焊接殘余拉應力峰值，降低效果與葉片出水邊焊段長度、焊縫各段的焊接方向有關;局部加熱法降低轉輪危險區域殘余應力的效果主要與加熱時間、加熱溫度以及加熱面積成正比，與冷卻面積成反比，並且危險區域的殘余應力隨加熱區域的增大呈先降低后升高的趨勢。
  2. The method is a direct simulation of the actual process of radiation propagation.

    這種方法是輻射傳輸實際過程的直接模擬。
  3. Basing on the analysis about the reason that how the superabundant torque appears, direct torque control strategy is used to realize the servo control of two asynchronous motors and load system ' s simulation. the measure method of superabundant torque of the system, the valid method of static state torque and the benchmark of dynamic torque are given by testifying the system ' s speediness through experiments

    在具體分析加載系統中多餘力產生原因的基礎上，採用直接轉矩控制策略，實現了兩臺異步電動機伺服控制和加載系統的負載模擬實驗，通過實驗驗證了系統的快速性；給出了系統多餘轉動慣量的測量、靜態轉矩的校驗和動態轉矩基準的實驗的基本方案。
  4. Many computational analysis of soil constitutive models appear to be irrational because of taking no account of or not thoughtfully considering the anisotropic deformation when they face the direct or indirect simulation of principal stress and principal strain relationship of load bearing unit

    諸多土體本構模型都會直接或間接面臨對受荷單元主應力主應變關系的模擬，但由於不考慮或考慮各向異性變形特性不周，對各向異性變形問題的計算分析就會出現不合理。
  5. Aiming at the problem that existence in the monitoring of simulate disk in local power grid, to enhance the level and efficiency of the electricity dispatch, to improve operation procedures, to change the troublesome work about 6kv line simulation disk, 35kv transformer substation and 6kv substation host cording diagram revision and maintenance from man - power, manual promotion to direct - viewing, real - time and work flow high automation level

    針對地方電網「模擬盤」監視中存在的問題，為提高電力調度工作水平和效率，完善操作規程，把煩瑣的6kv線路模擬盤、 35kv變電所和6kv配電所主結線圖的修改和維護工作從人工、手動提升到直觀、實時和工作流程高度自動化水平，實現電力調度日報、月報及日常管理實現規范化、自動化。
  6. The stochastic optimization method is brought forward, which makes a great amount of simulation of other bidder ' s biding in electrical market, as for every simulation, genetic algorithm is applied to solve the optimization problem, in consideration of the restraint of direct current network, one optimal bid is got, then using the average optimal bids in a great number of simulations as the last optimal bids. the program using c + + language of this method is programmed and examples are discussed for simulation, examples prove the bidding method ' s validity

    最後基於第五章的分析，提出了一種採用隨機優化和遺傳演算法相結合的競價方法，即對電力市場中各個競爭對手的報價作為隨機變量進行大量模擬，針對每一次模擬，在考慮直流潮流網路約束的情況下，用遺傳演算法求出一次模擬對應的最優報價，然後把大量模擬樣本求得的最優報價的均值，作為最優報價。
  7. Simulation and design of inverter power suplly used in direct current panel for power system substation

    變電所直流屏逆變電源的模擬分析與設計
  8. First, in virtual of identification of flaws is a typical of in - verse problems, proceeding from time - harmonic electromagnetic maxwell ' s equa - tion and helmholtz equation, the uniqueness and existence of direct scattering problems including the numerical algorithms of diverse of boundary conditions is given. second, the uniqueness and existence of inverse scattering problems and the theory of ill - posed integral equation are briefly looked back upon. finally, indicator function method for boundary identification is set up under all kinds of boundary conditions for inverse scattering of homogenous and inhomogenous objects, meanwhile, the proof of possibility for near - field measurements and nu - merical simulation are given

    由於缺陷的識別是一類典型的反問題，因而首先從時諧電磁maxwell方程和helmholz方程出發，具體地闡述了求解正散射問題的有關方法，包括各種（夾雜）邊界條件下的數值解法，就解的存在性唯一性給予了肯定的回答；隨后對逆散射問題的理論作了簡短的回顧，包括解的唯一性以及非線性不適定積分方程的處理等；然後對均勻介質和非均勻介質的逆散射問題建立了在各種邊界條件下的邊界識別的指示函數方法，鑒于近場數據獲得的重要性，對近場測試時邊界識別的方法給予了相應的證明，並且實現了數值模擬。
  9. A novel communication receiver which uses lapped transform ( lt ) incorporating modified median filter ( mmf ) algorithm is designed for narrow - band interference excision. the lt domain mmf algorithm takes full advantages of the direct sequence spread spectrum signal, as well as the characteristics of lt, performing the transform domain filtering twice. the first filtering locates the position of interference and mitigates most of them. the second filtering is performed in a small neighborhood of the located interference. so lt domain mmf algorithm can completely mitigate the interference without distorting the desired signal. simulation results demonstrate the improved ber performance and increased robustness of our receiver

    本文採用改進的重疊變換域中值濾波演算法進行變換域抗干擾處理.該演算法既考慮到直接序列擴頻信號的特點，同時又利用重疊變換的特性對變換域系數進行了二次濾波.該演算法節省處理時間，並且不需要有關干擾的先驗知識，系統性能不會隨干擾頻率變化而變化，因而是一種很穩健的處理方法
  10. The main characteristics of problem - based learning are : ( 1 ) learning is student - centered ( 2 ) learning occurs in small student groups ( 3 ) teachers are facilitators or guiders ( 4 ) problems form the organizing focus and stimulus for learning ( 5 ) problems are authentic and ill - structured ( 6 ) problems are a vehicle for the development of real - world problem - solving skills ( 7 ) new information is acquired and skills are trained through problem - solving process ( 8 ) evaluation is authentic and performance - based. after describing the features of problem - based learning, this thesis compares problem - based learning with other instruction models - lecture, direct instruction, case methods, discover - based inquiry, problem - centered learning, simulation and gaming and mantle of the expert ( roles ) on three aspects : ro

    這種教學模式的基本特徵是： （ 1 ）是一種以學生為中心的教學方法； （ 2 ）學習形式是以一個學生小組為單位； （ 3 ）教師是輔助者、引導者； （ 4 ）以問題為中心組織教學並作為學習的驅動力； （ 5 ）問題是真實的、劣構的； （ 6 ）問題是發展學生實際解決問題能力的手段； （ 7 ）在問題解決的過程中獲得新的知識、培養能力； （ 8 ）真實的、基於績效的評價。
  11. This paper mainly focuses on the noise limiting by means of the direct sequence spread spectrum ( dsss ) and the analysis of the transmission performance of the plc and some digital modulation technology. the contents of the paper is as follows : 1 ) the technical feasibility is proved after simulating noise limiting principle of dsss by means of systemview, the simulation software ; 2 ) a kind of band pass filter ( bpf ) is realized according to the requirement of filter and the principle of butterworth approximation, which satisfies the index of performance of dsss. 3 ) the low voltage plc system includes the sc1128, the specific modulation / demodulation ic, the bpf filter and other circuit components, furthermore, the control function of system is realized by means of the personal computer and the microcontroller

    本課題在對低壓電力線的傳輸特性和數字調制技術進行分析的基礎上，將通信理論中的直接序列擴頻技術（ dsss ）用於解決低壓電力線通信的干擾問題，主要研究內容如下： （ 1 ）用通信模擬軟體systemview對dsss技術的通信和抗干擾原理進行模擬分析，分別對時域和頻域下採用dsss技術前後接收信號的頻譜進行分析，驗證dsss技術在本系統中的可行性； （ 2 ）由dsss技術對濾波系統的要求，根據濾波理論分析了巴特沃思型濾波器的逼近原理並設計了合適的濾波電路； （ 3 ）用調制解調晶元sc1128和自行設計的濾波器加之輔助外圍電路，構造出低壓電力線載波通信系統，並採用atmel公司的單片機設計了接收和發射電路的微控制器； （ 4 ）分別對採取抗干擾措施前後輸入和輸出信號進行對比實驗，並對結果進行分析，驗證了dsss技術對干擾信號的抑制作用。
  12. Direct numerical simulation of spatial evolutional transition in pipe flow

    空間發展圓管轉捩的直接數值模擬
  13. 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。
  14. Direct numerical flow simulation in a two - dimensional turbine cascade

    二維渦輪葉柵流場的直接數值模擬
  15. The control tactics of space voltage vector are investigated, and the simplified algorithm which judges the sector location of reference vector and calculates switch operation time is put forward. by analyzing the current hysteresis control, the relation between switch frequency, and hysteresis bandwidth and input inductance of pwm rectifier is deduced. by applying instantaneous power theory, the principle of pwm rectifier power control is analyzed, and the direct power control by matlab toolbox through estimating active power and reactive power with virtual flux is realized, and the simulation results prove that it is correct

    對常用空間電壓矢量控制策略進行分析，提出了給定參考矢量所在區間判斷的簡化方法，以及電壓矢量作用時間的求取方法；分析了電流滯環控制策略，推導出開關頻率與滯環帶寬以及整流器輸入電感之間的關系；應用瞬時功率理論分析pwm整流器功率控制原理，通過虛擬磁鏈估計有功功率和無功功率，用matlab實現了直接功率控制，並驗證了該控制方法的正確性。
  16. In the previous direct simulation monte carlo ( dsmc ) method used in the dilute gas - solid flow, particle collision probability was calculated by the equation used for rarefied gas molecules. and gas phase was simulated by the laminar navier - stokes equations

    已有的應用直接模擬蒙特卡羅（ dsmc ）方法模擬流化床內稀疏氣固兩相流動的研究中，均採用稀薄氣體分子碰撞概率的計算方法計算氣固兩相流中顆粒的碰撞概率，採用層流navier - stokes方程模擬氣相流動。
  17. Based on the comprehensive analyses of the various solutions in rarefied gas dynamics and the fact in this research, the modeling and calculation for the flow in micro nozzle are carried out by using the direct simulation monte - carlo method, and the analysis of internal flow variations under some different working conditions are performed

    在綜合考慮了稀薄氣體動力學問題各種解法和本課題實際研究的基礎上，本文採用直接模擬蒙特卡羅方法（ dsmc ）對微噴管內流場進行建模和計算，並分析了各種工況下的內流場變化。
  18. The simulation results show that, compared with the indirect control, the direct control has more superior performance in current tracking speed and control property

    模擬結果表明，與電流間接控制相比，電流直接控制在電流跟蹤速度、控制精度等方面更具優勢。
  19. Two kinds of simulation model to calculate the hitting probability of cargo - projectile are built up, which are the direct simulation of firing errors of cargo - projectile and the simulation of firing errors combined with numerical integretion. specific method to calculate the hitting probability of both round and rectangular aim are given, so are the generation of normal distribution vector and uniform distribution vector

    給出了對圓形目標和矩形目標的具體計算方法，以及正態分佈隨機向量和均勻分佈隨機向量的產生方法，根據算例的結果，討論了子彈重迭度對子母彈首發命中概率的影響。
  20. Based on the principle of molecular dynamics, a sampling method in direct simulation monte carlo ( dsmc ) method for molecular total and translational energy, and the heat flux vector nearby the wall boundary is proposed

    摘要從分子動力學出發，討論了直接模擬蒙特卡羅方法中分子平均總能量、平均平動能以及邊界熱流密度的抽樣方法。
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