瞬時采樣 的英文怎麼說
中文拼音 [shùnshícǎiyàng]
瞬時采樣
英文
grab sampling-
The traditional method is that sampling 20 equidistance discrete voltages to calculate the virtual value. to gain the virtual value, we firstly average their square values, and then extract it
傳統的計算有效值的方法是利用一個周期內等距離散的20個采樣點的瞬時值進行求解，通過計算它們的均方根值來得到有效值。The safety of transmission line plays a important role in power system safety it is not only the requirement of ensure supply power reliability, but also the necessary precondition of enhance power system stabilization, to remove faulty line quickly and accurately, also keep non - faulty line continuous work when some transmission line faults current differential protection is a kind of simple, reliable and good - selective protection manner to any variety of transmission lines, power system development needs current differential protection apply to transmission lines, moreover the advancement of electric and communication technology enable current differential protection apply to transmission lines firstly, the paper discusses, analyses the research and application transmission line protection in detail, compare the principle and realistic presupposition of general line pilot protections secondly, because conventional current vector differential protection are influenced easily by load current and transitional resistance, in order to at the same time quicken protection act, the principle and criterion include work characteristic of differential protect based on fault component sampled values are studied, results shows that differential protect based on fault component sampled values excels general vector current differential protection in reliability, sensitivity and anti - saturation of current transformer in addition, synchronous current sampling methods at all terminals of line is analyzed and estimated lastly, the principle and criterion. also device design about current sampling values differential protection based on optical fiber communication, which apply to short transmission lines are concretely investigated,
基於基爾霍夫定律的電流差動保護無論對於何種形式的輸電線路都是一種簡單、可靠、選擇性強的保護形式，電力系統的發展使得電流差動保護應用於線路保護成為需要，而電子、通信技術的發展使得電流差動保護應用於輸電線路成為可能。首先，本文對目前線路保護的研究和實際應用情況進行了討論和分析，比較了常用線路縱聯保護的實現原理和實現條件及優缺點。其次，針對常規相量電流差動保護易受正常負荷電流和故障過渡電阻影響的缺點，同時為加快差動保護的動作速度，對基於故障分量瞬時采樣值電流差動保護的原理、判據、動作特性等作了討論和分析，結果表明基於故障分量瞬時采樣值電流差動保護在可靠性、靈敏度、抗電流互感器飽和方面明顯優于常規相量電流差動保護，對電流差動保護各端的同步采樣方法和數據通信也進行了分析和評價。The principle of vibrator is to introduce scattered energy to underground in a comparatively long time, and collect the energy through correlation and compress it into a narrow pulse. the portable high - frequency vibrator system, developed by key lab of geo - exploration and instrumentation ( jilin univ ), ministry of education, generates chirp signal and accumulates energy through a long - time bestiring. according to the characteristics of vibrator, the seismic recorder that operates on - line with vibrator must have these functions as follow : first, it must have the ability of recording a great quantity of data. second, it must have assistant channels to sample reference signal. third, it must have the function of data correlation in real - time
可控震源利用可控的小能量、長時間激發波來實現沖擊震源瞬時產生的大能量激發波。在利用可控震源進行地震勘探時，要求地震儀長時間記錄地震信號，這對地震儀的采樣長度提出了很高的要求。受存儲量和數據傳輸速度的限制，絕大多數地震儀很難對如此大的數據量進行記錄，同時，可控震源要求地震儀有兩個輔助通道並且具有數據相關功能，目前國內還沒有出現滿足要求的地震儀產品。The pid control of output voltage feedback is easy to give attention to static and dynamic performance of the control system. output performance of inverter of ups is improved when rms of output voltage feedback is added to pid control system. the hardware and software is designed in order to achieve the digital pid control of inverter of ups
設計了用於逆變器數字化控制的采樣調理電路，結合tms320f240的硬體資源，通過軟體實現了ups系統的緩起動和市電跟蹤，並改進了逆變器電壓瞬時值控制，通過引入輸出電流中心值檢測，對反饋電壓進行補償，解決了逆變器輸出的偏磁問題。It involves not only the detection of signal frequency, signal phase and power factor but also calculation and control of phase. the method of calculating phase is based on fast fourier transform algorithm ( fft ). it is used to calculate signal frequency, signal phase, power factor and the phase on / off time according to sampling instantaneous value of voltage and current
本文主要提出了採用信號處理技術（快速傅里葉變換fft ） ，根據電壓、電流采樣的瞬時值，計算信號頻率、信號相位、功率因數、分合閘相角的選相控制方法，並介紹了最終控制分合閘的原理與實現方法We design a fast calculating amplitude method : obtain two instantaneous voltages at first, after that calculate the current voltage virtual value once we get another instantaneous voltage
我們設計了一種快速計算幅值的方法，只需先採得兩個電壓瞬時值，之後每采樣一個電壓瞬時值即可求得當前的電壓幅值。The drfm can store a transmitted signal of the radar and replicate it on command. properly implemented, in addition to radar signals, the drfm can generate noise jamming and other electromagnetic signals typically experienced in the ew environment. other difficult to generate deception spectrums can be easily implemented by analysis of the desired spectrum
本課題為射頻模擬系統的一個組成部分，設計指標要求有300mhz的瞬時帶寬，本系統採用采樣速率為1ghz的超高速模數轉換器（ adc ） ，實際使用兩個采樣速率為500mhz的adc交替采樣以達到1ghz 。This paper has devised a plug - in data acquisition ( daq ) system based on isa bus and developed a real - time testing software with the platform of the graphic programming language - labview, which has test data ' s real - time sampling, analysis and processing, instantaneous plot saving, plot reoccurrence, data saving to disk and reading from disk functions and so on
本課題設計了基於isa總線的內插式數據採集（ daq ）系統，並以圖形化高級語言labview為平臺編制了虛擬儀器實時測試軟體，實現了數據的實時采樣、實時分析處理、瞬間圖形存儲、圖形再現、數據存盤和讀入等功能。As the kernel of software, the algorithm is another emphasis of the paper ' s works. based on the principle of relaying working, after comparing the effect between the algorithm of instantaneous sampling and the algorithm of vector, the virtue of short data windows and precision action was stood out. and the choice of algorithm with three sampling data was for the reason of short data windows
演算法理論作為微機保護的軟體核心也是本文的討論重點，以保護的動作原理為基礎，認真研究了采樣瞬時值法與一般的矢量值法的效果比較，突出了采樣瞬時值法時間窗短、動作準確的優點；而針對低電壓閉鎖所採用的三采樣值積演算法也正是出於時間窗較短，便於配合保護動作的考慮。The content of this dissertation include : orthogonal transformation of digital signal ; mathematic model of modulation signals and software - defined radio receiver ; nine feature parameters of the modulation algorithm and threshold of feature parameter ; development procedure of modulation recognition by ccs and the modulation digital signals produced through matlab ; discussion on sampling speed and instantaneous frequency and analysis of experiment " s result
本文給出了在ccs集成開發環境下調制識別演算法模擬實現的程序設計和利用matlab模擬產生調制信號的方法；分析了調制識別演算法的模擬實驗結果；對采樣速率的選取、非弱信號段判決、瞬時頻率的計算以及演算法數據關聯性的簡化等方面進行了研究。分享友人