基于變頻調速的水平連鑄機拉坯輥速度控制系統(tǒng)Frequency Inverter Based Drawing RollerS peedC ontrolSy stem ofHorizontal Continuous Casting MachineA 偉劉沖旅巴(南 華 大 學電氣工程學院，衡陽421001)摘要拉坯輥速度控制是水平連鑄工藝的關鍵技術之一，采用變頻器實現(xiàn)水平連鑄機拉坯輥速度程序控制，由信號發(fā)生裝置給變頻器提供程控信號。現(xiàn)場應用表明該控制系統(tǒng)速度響應快，控制精度高，滿足了水平連鑄生產的需要。關鍵詞水平連鑄拉坯輥速度程序控制變頻器Absh'act Speedc ontorlof dr awingor leris on eo fth ek eyte chnologiesfo rho rizontalco ntinuousca stingm achine.Fo rth ispu rpose,fr equencyco nverterisad optedfo rdr awingor lersp eedp rogrammablec ontorlof ho rizontalco ntinuousca stingm achine,th ep rogrammableco ntorlsi gnalto fr equencyc onverteris provided場a signal generator. The results of application show that the response of system is rapid and the control accuracy is high enough to meet thedemand of production of horizontal continuous casting.Keywords Horizontalco ntinuousc asting Drawingor ler Speedp rogrammablec ontrol Ferquencyin verter 隨著 現(xiàn) 代 化工業(yè)生產對鋼材需求量的日益增加，連鑄生產能力已經成為衡量一個國家冶金工業(yè)發(fā)展水平的重要指標之一。近十幾年來，水平連鑄由于具有投資少、鑄坯直、見效快等多方面的優(yōu)點，國內許多鋼鐵企業(yè)利用水平連鑄機來澆鑄特種合金鋼，發(fā)揮了其獨特的優(yōu)勢并取得了較好的經濟效益〔1,2)0采用 水 平 連鑄機澆鑄特種合金鋼時，由于拉坯機是水平連鑄系統(tǒng)中的關鍵設備之一，拉坯機及其控制性能的好壞直接影響著連鑄坯的質量，因此，連鑄的拉坯技術便成為整個水平連鑄技術的核心。由于鋼的冶煉過程是在高溫下進行的，鋼水溫度的變化又容易影響鑄坯的質量和成材率，因此，如何能在高溫環(huán)境下控制好與鑄坯速度相關的參數(shù)(拉、推程量，中停時間和拉坯頻率等)對于確保連鑄作業(yè)的進一步高效化，延長系統(tǒng)的連續(xù)作業(yè)時間十分關鍵。因此，拉坯輥速度控制技術是連鑄生產過程控制領域中的關鍵技術之- [31
上傳時間： 2013-10-12
上傳用戶：gxy670166755
基于ADSP-BF561的數(shù)字攝像系統(tǒng)設計Design of Digital Video Camera System Based on Digital Signal ProcessorADSP-BF561（浙江大學 信息與通信工程研究所，浙江 杭州 310027） 馬海杰, 劉云海摘要：介紹了基于ADI雙核的數(shù)字信號處理芯片ADSP-BF561 的數(shù)字攝像系統(tǒng)實現(xiàn)方案。系統(tǒng)包括硬件和軟件兩部分，硬件主要有ADSP-BF561及其外圍電路、音視頻模數(shù)/數(shù)模轉換、CF卡/微硬盤接口等部分。軟件主要有操作系統(tǒng)及音視頻編解碼算法等部分。關鍵詞：ADSP-BF561 ;數(shù)字攝像機;微硬盤;MPEG-4;A/D;D/A中圖分類號:TN948.41文獻標識碼:AAbstract: An implementation of digital video camera system based on ADI dual core digital signal processor ADSP-BF561 is introduced. The system can be divided into two parts——hardware and software design. The hardware design includes ADSP-BF561 and perpheral apparatus, A/D,D/A, CF card or Microdrive and so on. The software includes operating system , audio and video coding algorithm.Key words: ADSP-BF561; digital video camera; microdrive; MPEG-4;A/D;D/A
標簽： ADSP-BF 561 數(shù)字攝像 系統(tǒng)設計
上傳時間： 2013-11-10
上傳用戶：yl1140vista
為了擴大監(jiān)控范圍，提高資源利用率，降低系統(tǒng)成本，提出了一種多通道視頻切換的解決方案。首先從視頻信號分離出行場信號，然后根據行場信號由DSP和FPGA產生控制信號，控制多路視頻通道之間的切換，從而實現(xiàn)讓一個視頻處理器同時監(jiān)控不同場景。實驗結果表明，該方案可以在視頻監(jiān)控告警系統(tǒng)中穩(wěn)定、可靠地實現(xiàn)視頻通道的切換。 Abstract: To expand the scope of monitoring， improve resource utilization， reduce system cost， a multiple video channels signal switching method is pointed out in this paper. First， horizontal sync signal and field sync signal from the video signal are separated， then control signal according to the sync signal by DSP and FPGA is generated to control the switching between multiple video channels. Thus， it achieves to make a video processor to monitor different place. Experimental results show that the method can realize video channel switching reliably， and is applied in the video monitoring warning system successfully.
上傳時間： 2013-11-09
上傳用戶：不懂夜的黑
在綜合分析諧波勵磁無刷同步發(fā)電機勵磁控制系統(tǒng)的基礎上,對其勵磁控制策略進行了研究,開發(fā)了一套基于DSP( TMS320F2812) 控制的新型柴油發(fā)電機勵磁控制系統(tǒng),該系統(tǒng)采用參數(shù)自適應模糊PID 控制勵磁,選用交流采樣方式實時檢測各信號的瞬時特性,系統(tǒng)仿真結果以及在1 臺25 kW 工頻柴油發(fā)電機上的試驗結果證明了該控制器具有較好的電壓調節(jié)特性,系統(tǒng)穩(wěn)態(tài)和暫態(tài)性能完全滿足發(fā)電機對勵磁系統(tǒng)的要求。關鍵詞:勵磁調節(jié);模糊PID 控制;數(shù)字信號處理器;交流采樣 Abstract :According to the general analysis of the excitation cont rol system of the harmonious wave excitation brushless synchronous generator and it s characteristics ,a new type of diesel generator excitation cont rol system based on DSP( TMS320F2812) was designed. An adaptive fuzzy PID cont rol of excitation is used in this system. To detect the t ransient characteristics of the signals in a timely manner ,AC sampling was applied.The system simulation result s and the testing result s f rom a 25 kW diesel generator (50 Hz) can prove that the voltage regulation characteristics of the excitation cont rol system are very well ,and both the steadyOstate performance and the t ransient performance of the generator are also good.Key words :excitation cont rol ;fuzzy PID cont rol ;digital signal processor (DSP) ;AC sampling
標簽： DSP 柴油發(fā)電機 勵磁控制 系統(tǒng)研究
上傳時間： 2013-10-29
上傳用戶：fxf126@126.com
以Altera公司的Quartus Ⅱ 7.2作為開發(fā)工具，研究了基于FPGA的DDS IP核設計，并給出基于Signal Tap II嵌入式邏輯分析儀的仿真測試結果。將設計的DDS IP核封裝成為SOPC Builder自定義的組件，結合32位嵌入式CPU軟核Nios II，構成可編程片上系統(tǒng)（SOPC），利用極少的硬件資源實現(xiàn)了可重構信號源。該系統(tǒng)基本功能都在FPGA芯片內完成，利用 SOPC技術，在一片 FPGA 芯片上實現(xiàn)了整個信號源的硬件開發(fā)平臺，達到既簡化電路設計、又提高系統(tǒng)穩(wěn)定性和可靠性的目的。
上傳時間： 2013-11-06
上傳用戶：songkun
為了在CDMA系統(tǒng)中更好地應用QDPSK數(shù)字調制方式，在分析四相相對移相（QDPSK)信號調制解調原理的基礎上，設計了一種QDPSK調制解調電路，它包括串并轉換、差分編碼、四相載波產生和選相、相干解調、差分譯碼和并串轉換電路。在MAX+PLUSⅡ軟件平臺上，進行了編譯和波形仿真。綜合后下載到復雜可編程邏輯器件EPM7128SLC84-15中，測試結果表明，調制電路能正確選相，解調電路輸出數(shù)據與QDPSK調制輸入數(shù)據完全一致，達到了預期的設計要求。 Abstract: In order to realize the better application of digital modulation mode QDPSK in the CDMA system， a sort of QDPSK modulation-demodulation circuit was designed based on the analysis of QDPSK signal modulation-demodulation principles. It included serial/parallel conversion circuit, differential encoding circuit, four-phase carrier wave produced and phase chosen circuit, coherent demodulation circuit, difference decoding circuit and parallel/serial conversion circuit. And it was compiled and simulated on the MAX+PLUSⅡ software platform,and downloaded into the CPLD of EPM7128SLC84-15.The test result shows that the modulation circuit can exactly choose the phase，and the output data of the demodulator circuit is the same as the input data of the QDPSK modulate. The circuit achieves the prospective requirement of the design.
上傳時間： 2014-01-13
上傳用戶：qoovoop
波長信號的解調是實現(xiàn)光纖光柵傳感網絡的關鍵，基于現(xiàn)有的光纖光柵傳感器解調方法，提出一種基于FPGA的雙匹配光纖光柵解調方法，此系統(tǒng)是一種高速率、高精度、低成本的解調系統(tǒng)，并且通過引入雙匹配光柵有效地克服了雙值問題同時擴大了檢測范圍。分析了光纖光柵的測溫原理并給出了該方案軟硬件設計，綜合考慮系統(tǒng)的解調精度和FPGA的處理速度給出了基于拉格朗日的曲線擬合算法。 Abstract: Sensor is one of the most important application of the fiber grating. Wavelength signal demodulating is the key techniques to carry out fiber grating sensing network， based on several existing methods of fiber grating sensor demodulation inadequate， a two-match fiber grating demodulation method was presented. This system is a high-speed， high precision， low-cost demodulation system. And by introducing a two-match grating effectively overcomes the problem of double value while expands the scope of testing. This paper analyzes the principle of fiber Bragg grating temperature and gives the software and hardware design of the program. Considering the system of demodulation accuracy and processing speed of FPGA，this paper gives the curve fitting algorithm based on Lagrange.
標簽： FPGA 光纖光柵 解調系統(tǒng)
上傳時間： 2014-07-24
上傳用戶：caiguoqing
友善之臂的QtEmbedded實例教程 第一章 LINUX 圖形用戶界面 GUI 介紹.....................................................................................1 1.1 常用 GUI 介紹...................................................................................................................1 1.2 關于 Qt...............................................................................................................................2 1.3 Qt/Embedded 簡介.............................................................................................................4 1.4 Qtopia 介紹.........................................................................................................................4 第二章 QT的安裝..........................................................................................................................6 2.1 Qt X11 的安裝....................................................................................................................6 2.2 Qt/Embedded 安裝..............................................................................................................9 2.3 Qtopia 編譯.......................................................................................................................11 第三章 QT的編程........................................................................................................................12 實驗一 “Hello word！ ”Qt初探............................................................................................12 實驗二 創(chuàng)建一個窗口并添加按鈕.......................................................................................17 實驗三 對象間通信：Signal 和 Slot 機制........................................................................20 實驗四 菜單和快捷鍵...........................................................................................................29 實驗五 工具條和狀態(tài)欄.......................................................................................................38 實驗六 鼠標和鍵盤事件.......................................................................................................48 實驗七 對話框.......................................................................................................................63 實驗八 Qt 中的繪圖..............................................................................................................75 實驗九 Qt 中的多線程編程..................................................................................................85 實驗十 Qt 中的網絡編程......................................................................................................97 第四章 QT常用工具的介紹...................................................................................................... 111 4.1 Qt 設計器（Qt Designer）............................................................................................ 111 4.2 Tmake..............................................................................................................................113 4.3 Qvfb ................................................................................................................................114
標簽： QtEmbedded 教程
上傳時間： 2013-12-21
上傳用戶：laozhanshi111
SYNC 引腳可以用來輸出一個同步信號（synchronization signal），也可以在應用使來控制一個LED 燈的輸出狀態(tài)。：SYNC 端通過一個三極管或門電路來控制LED。
上傳時間： 2013-11-11
上傳用戶：maizezhen
With the Altera Nios II embedded processor, you as the system designercan accelerate time-critical software algorithms by adding custominstructions to the Nios II processor instruction set. Using custominstructions, you can reduce a complex sequence of standard instructionsto a single instruction implemented in hardware. You can use this featurefor a variety of applications, for example, to optimize software innerloops for digital signal processing (DSP), packet header processing, andcomputation-intensive applications. The Nios II configuration wizard,part of the Quartus® II software’s SOPC Builder, provides a graphicaluser interface (GUI) used to add up to 256 custom instructions to theNios II processor
上傳時間： 2013-11-07
上傳用戶：swing
