direct digital control 中文意思是什麼
direct digital control
解釋
直接數控-
Flexible dimming control utilizes either an analog control signal or direct digital pwm control without external rc filtering. this also increases dimming accuracy at low brightness levels
電路採用靈活的調光控制方式，既可輸入模擬控制信號，也可直接輸入數字脈沖寬度調制信號而不需要外置rc濾波器。 -
Step - forced dynamic speed drop analysis digital control, dual ring, direct current and reversible speed governing system
數控雙環直流可逆調速系統階躍擾動動態速降分析 -
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。 -
The paper lays a strong emphasis on discussing the realization of the autocontrol of raster scanning of the scanner in x - y dimension, the " tapping " of the cantilever of the tappingmode afm by a direct digital synthesizer. then a method of parallel communication between dsp and pc in epp mode is given. finally, the author discussed the digital pid closed loop control of the scanner in z - direction, the automatic approaching of the tip using step - motor, and also some electro - magnetic interferences
論文首先簡單介紹了掃描探針顯微鏡的發展、分類、工作原理及應用；接著對ti公司的tms320vc5402dsp的特點及外圍擴展作了簡單介紹；然後分章節重點講述了利用vc5402dsp實現掃描探針顯微鏡的核心部件? ?壓電陶瓷管的x向和y向的光柵掃描控制；藉助直接數字集成器（ dds ）實現輕敲式原子力顯微鏡的微懸臂的「輕敲」 ； vc5402dsp的主機介面（ hpi ）與pc機在增強并行口（ epp ）模式下的通信；論文最後還介紹了掃描管z向的數字pid閉環控制，步進電機的自動進針，並對實際出現的一些電磁干擾問題作了討論。 -
Based on the quick development of computer network, this thesis deals with how to apply network technology to civil and architectural engineering. the finished research contains as follows : the research on reraote - network - monitor - system, the realization of the data collection of ddc ( direct digital controller, multi - loop data circuit monitor ), the communication, the real time control of remote network. moreover, the remote - network - monitor - system is applied in the engineering practice in which monitoring the security of high framed girder and plank
其中包括：研究了遠程網路檢測系統基本結構，實現了下位機（多路數據巡迴檢測儀）現場數據採集、下位機與上位機通信、遠程網路實時控制採集過程等；成功編制了下位機與上位機通信軟體和用於動態更新、存儲數據的數據庫系統；將遠程網路檢測系統應用於工程實例，完成了高層建築框支梁安全性監測、不抽芯板專利技術檢測。 -
Aim at the dtc ' s blemish mentioned above and the direction of dtc technique development, the dissertation put great emphasis on the work as follows, with an eye to exalt dtc system function : ( 1 ) a new speed - flux observer of an induction motor is proposed to enhance the accuracy of flux observing, which is an adaptive closed - loop flux observer and different from the traditions. a new adaptive speed - observation - way is deduced out according to the popov ' s stability theories ; ( 2 ) to improve the performance of dtc at low speed operation, we have to exalt the accuracy of the stator flux estimation and a new way of bp neural network based on extended pidbp algorithm is given to estimate and tune the stator resistance of an induction motor to increase the accuracy of the stator flux estimation ; ( 3 ) digital signal processor is adopted to realize digital control. an device of direct torque control system is designed for experiment using tms320lf2407 chip produced by ti company ; ( 4 ) bring up a distributed direct torque control system based on sercos bus, sercos stand for serial real time communication system agreement which is most in keeping with synchronous with moderate motor control ; ( 5 ) the basic design frame of the hardware and software of the whole control system is given here and some concrete problem in the experiments is described here in detail
針對上面提到的直接轉矩控制的缺陷和未來直接轉矩控制技術發展方向，本論文重點做了以下幾個方面的工作，目的在於提高dtc系統的綜合性能： （ 1 ）提出一種新型的速度磁鏈觀測器，新型的速度磁鏈觀測器採用自適應閉環磁鏈觀測器代替傳統的積分器從而提高磁鏈觀測的精度，並且根據popov超穩定性理論推導出轉速的新型自適應收斂律； （ 2 ）改善系統的低速運行性能，主要從提高低速時對定子磁鏈的估計精度入手，提出了一種提高定子磁鏈觀測精度的新思路? ?利用基於bp網路增廣pidbp學習演算法來實時在線地修正定子電阻參數； （ 3 ）採用數字信號處理器dsp實現系統全數字化硬體控制，結合ti公司生產的tms320lf2407晶元，設計了直接轉矩控制系統的實驗裝置； （ 4 ）提出了基於sercos總線網路化分散式的直接轉矩控制系統， sercos （ serialrealtimecommunicationsystem ）是目前最適合同步和協調控制的串列實時通信協議； （ 5 ）基本勾勒出整個控制系統的硬體和軟體設計基本框架，詳細描述一些實驗中的具體的細節問題。 -
The full digital direct torque control based on dsp
的全數字無速度傳感直接轉矩控制 -
This paper based on control theory, according to the conception of phrase lock loop and direct digital synthesis, we designed the clock circuit. it realizes the amalgamation of kinds of the ways about clock, which make it has some superiority
本論文在控制理論的基礎上，以鎖相頻率合成和直接數字頻率合成作為設計思想，搭建時鐘控制電路，在業界實現了多種時鐘控制電路實現方法的融合與統一，具有一定的優越性和領先性。 -
The configuration that uses ieee - 13 94 to control a vxi system is introduced. chapter 2 describes the resource manager application of message - based device 13 94 - vxi controller and the mechanism of register - based device arbitrary waveform generator ( awg ). the key technology of interface circuit and direct digital synthesis in awg module is discussed explicitly
本文先對vxi總線技術進行了概略的介紹，在此基礎上，對一具體的vxi寄存器基任意波形發生器模塊進行展開，介紹了任意波形發生器模塊與vxi機箱背板總線通訊的介面電路部分及波形發生機理的核心部分的直接數字合成技術。 -
The advantage of the direct digital control in cctm is demonstrated. the content and the technical method used in this study is presented at the end of the chapter
第一章，綜合論述了發展全自動微機控制水泥試驗機的意義，闡述直接電液控制方法的優越性，並介紹了本文的主要研究方向和內容。 -
Hardware design uses high - speed digital signal processor tms320lf2407a as the key control part. software design adopts hexagon stator flux scheme and round stator flux scheme respectively. after the system is set up, the direct torque control method is realized for a 0. 12kw winding asynchronous motor
最後根據以上的討論和實際應用中的情況，分別採用六邊形磁鏈方案和圓形磁鏈方案，以高速數字信號處理器ths320lf2407a作為核心控制部件，在一臺0 . 12kw的繞線式異步電機上實現了異步電機直接轉矩控制。 -
In this paper, it is carried out the controlled system of single - chip microcomputer ( at89c52 ), which is based on ddc ( direct digital control ), to resolve the synchronization of the amount of seeding transplant and velocity, and utilize series voltage regulator to resolve the stability of the voltage
本文採用型號為at89c52單片機（單片微型計算機single - chipmicrocomputer ）的直接數字控制（ directdigitalcontrol ）技術，解決擺秧機行走速度與擺秧量同步性的問題。 -
A single neural cell self - adaptive controller is studied. furthermore, a direct digital control system of srm based on this single neural cell self - adaptive controller is designed by using mcs - 80c196kb microprocessor
本文對單神經元pid自適應控制器進行了模擬，並將此演算法應用於sr電機直接數字控制系統中，以intel公司的mcs - 80196kb為控制器，進行了軟硬體的設計和調試。 -
In this thesis, by referring to the information of the state - of - art of the cement compression testing machine ( cctm ) both at home and abroad, a new means of direct digital control is introduced for the loading rate control of cctm
本論文在對試驗機行業作了充分調研的基礎上，通過閱讀、分析及綜合大量文獻，進行了計算機控制技術應用於水泥壓力試驗機的研究。 -
As the first to provide direct digital control technology for building automation, the first to embed a web server in a building controller and the first to provide complete integrated solutions based on open systems for building it, a company of profound service culture and professional knowledge, with the help of its parent company, schneider electric s source advantages, tac has acquired quick development in chinese market and participated the prestigious projects, such as national theater, national high court, guangzhou exhibition centre, beijing friendship hospital, tsinghua university sports centre and so on
C .憑借母公司施耐德的優勢資源已經在中國市場獲得了長足的發展，先後承攬了包括國家大劇院、最高人民法院、廣州會展中心、北京友誼醫院及清華大學體育中心在內的一系列國家重點工程。而施耐德電氣在實現對tac及安德沃的收購、重組后將更加從容面對2008年北京奧運會及2010年上海世博會帶來的機遇和挑戰。 -
A new all - digital fuzzy direct torque control servo system of pmsm based on dsp ( tms320lf2407a ) is designed and constructed, in which the traditional space voltage vector selector is replaced by an analytic fuzzy control state selector
摘要提出在pmsm直接轉矩控制系統中，採用解析模糊控制狀態選擇器替代傳統的空間電壓矢量選擇器的新型控制方法，設計完成了基於dsp （ tms320lf2407a ）為核心的全數字模糊直接轉矩控制系統。 -
Namely along with the rapid development of power electronics technology, computer technology and automatic control technology, the electric transmission technology is being faced with a history revolution, it has become development trend that transferring speed replaces direct current accent speed and computer digital control technology replaces the simulating control technology
隨著電力電子技術、計算機技術、自動控制技術的迅速發展，電氣傳動技術面臨著一場歷史革命，即交流調速取代直流調速和計算機數字控制技術取代模擬控制技術己成為發展趨勢。 -
In this dissertation, the author has accomplished the simulation of the dtc system and analyzed the corresponding results. the software of the digital control system, in which the digital signal processor ( dsp ) is used, has also been designed in the thesis. the direct torque control scheme is studied in the paper, and the simulation models of hexagon flux control system and approximate circle flux control system are presented based on the application of matlab / simulink
本文對異步電機直接轉矩控制變頻調速方法進行了研究，採用mathworks軟體公司為matlab開發的系統模型圖形輸入和模擬工具simulink對直接轉矩控制的六邊形和近似圓形兩種定子磁鏈控制方法進行了模擬，實現了有速度傳感器的直接轉矩控制系統的構建，從理論上證明了這兩種方法的可行性。 -
On the building services side, a direct digital controlled air - conditioning system with plant optimization programme control was installed to maximize operational efficiency
屋宇設備方面，採用了直接數碼控制系統，配合機組最優程序控制，令空調系統達至最高效率。 -
A direct digital control ( ddc ) system was adopted, which can grab the dynamic image of fruits in real time, and send the results of image processing to the parallel port of computer, then control several step motors " status at the same time
本研究採用計算機直接數字控制方式，對動態水果圖像進行實時採集，並通過計算機的列印埠輸出圖像處理結果，實現同時對多個執行器的動作狀態進行控制。
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