較細拓撲 的英文怎麼說
中文拼音 [jiàoxìtàpū]
較細拓撲
英文
finer topology-
Secondly, on the basis principles of mis and erp, combining the design and development of the management information system of the industrial company of green hill in chongqing ( qsmis ), basing the foundations of system and demands analyzing, it carried on more detailed argumentations of module designing, data system, network and structure of system, modes of calculation etc. especially, it gave the discussing about flow rebuilding, technology of coding, interface designing, and system optimizing. at the same time, it expatiated the safety precautions of system, and explained the main ability and effects of system by the overall frames and charts of system ' s structure, and every logic flow chart of module of function of qsmis briefly
其次，在充分理解mis和erp原理基礎上，結合重慶青山工業公司管理信息系統（ qsmis ）的設計和開發，在系統需求分析的基礎上，對系統的功能模塊、數據庫系統、網路拓撲及體系結構、計算模式等進行了較詳細的論述；尤其是對系統開發中實施的業務流程再造、編碼技術、界面設計、及系統優化等關鍵技術進行了較為系統的探討，同時對系統所實施的安全策略進行了闡述；並通過設計出的qsmis的總體框架以及系統結構圖、各功能模塊的邏輯流程圖，對系統實現的主要功能和作用作了簡要概述。Firstly, this paper introduces the asynchronous motor model, and compares it with the dc motor ’ s. then the paper studies the principle of vector control, and proposes an improved current model of rotor flux observer. this paper also studies the three - level inverter ’ s topology, working principle, the neutral - potential unbalance mechanism and its controlling strategy. the paper especially studies the svpwm in details. the interface between the vector control and the three - level inverter is studied in details, including the generation of reference voltage vector, its judging of the sector and triangular regions, and the working mechanism after it sent into three - level inverter. when synthesizing the reference voltage vector, select the vector which only includes p and o states as the starting vector, thus eliminate the vector shift problem when sector changes. this paper fully takes advantages of the powerful functions of matlab / simulink to set up the simulation model. this construction is very explicit. the simulation results verify the inverter voltage output is correct, the rotor flux is steady, the asynchronous motor ’ s dynamic and steady state performances and speed modulation are excellent
本文首先介紹了異步電機的數學模型，在此基礎上將異步電機的數學模型與直流電機的數學模型進行了比較;然後介紹了矢量控制的基本原理，採用了一種改進的轉子磁鏈電流型觀測模型;對三電平逆變器的電路拓撲、工作原理、中點電位不平衡的機理及控制方法進行了介紹，詳細分析了空間矢量脈寬調制策略。本文對異步電機的矢量控制與三電平逆變器之間的介面進行了詳細的研究，包括:參考電壓矢量的形成、所落扇區與具體小三角形區域的判斷、送入逆變器之後的工作機理。在參考電壓矢量的合成時，選擇只包含p 、 o狀態的空間電壓矢量作為起始矢量，解決了扇區切換時的矢量突變問題。Hfc ( hybrid of fiber and coax ) network is a competitive means to support wide varieties of video, voice and data services. the thesis describes and analyzes the system framework, frequency assignment and signal modulation schemes of hfc. recently hfc and adsl are aggressive among broadband access technologies
本文對hfc網的系統結構、網路拓撲、頻譜分配方案和業務信號的調制方式等進行了詳細的闡述和分析，並且全面地比較了hfc和adsl的優缺點，總結出hfc具有較高的性價比，是我國寬帶接入網的優選方案。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。In the practice application, the project ? the large dam secure supervising and measuring system of taipu brake, which the penman participated himself, is introduced in detail, which includes the system synopsis, the definition of the pressure, the crack, the horizontal displacement and the vertical displacement, the compare of diversified measuring methods, the choice of the instruments and the configuration of the instruments, the system network topology configuration, the collocation of various metrical dots and instruments " demarcating and testing, the system software and the application software, the communications between the intelligent instruments and the primary interfaces of actual system
在實踐應用方面，詳細介紹了筆者親自參與實施的工程? ?太浦閘大壩安全監測系統，包括系統簡介，揚壓力、裂縫、水平位移和垂直位移的定義，各種測量方法的比較，儀器的選型以及儀器的結構，系統的網路拓撲結構，各測點的布置以及儀器的標定測試，系統軟體和應用軟體，智能儀器與上位機的通信，實際系統的主要界面。為了論文的完整性，介紹了大壩安全監測專家系統。分享友人