small-signal theory 中文意思是什麼
small-signal theory
解釋
小信號理論-
We select ni / cr alloy resistor as element together with ceramic embedding hearth ; select small flat - and - disc heat - even hubby ceramic sample holder, select ni / cr & ni / si thermoelectric couple ( type k ) as thermoscope with threads 0. 5 mm in diameter which is installed in the middle of the holders symmetrically ; select aluminum silicate fire - retardant fiber as materials for heat preservation ; design some hardware, for example temperature controller & transporter, signal amplifier etc ; design controlling curve to heat stove ; and introduce the method of least squares nonlinear regression and subsection function to deal with data. in order to obtain the reasonable operation conditions and operation curve, we have also done many theory analysis and experiment discussions
通過理論和試驗探討，選用鎳鉻合金電阻絲作為加熱元件，配以陶瓷質埋入式爐膛；選用陶瓷質小尺寸扁平?圓盤均熱塊體型樣品支持器；選用0 . 5mm絲徑鎳鉻?鎳硅熱電偶（ k ）作為測溫元件；熱電偶對稱安置在樣品支持器容器的中部；選用硅酸鋁耐火纖維作保溫材料；合理選用和設計了溫度控制器、溫度變送器、信號放大電路等硬體；採用升溫曲線來控制爐膛供熱過程；採用最小二乘法非線性回歸與分段函數相結合的曲線模擬方法，進行圖形處理。 -
One is to use fourier transformation to convert the source signal from time domain to frequency domain and to discard high frequency harmonious components upwards of 19 ( gb / t14953 - 93 d5. 3 demanding ), then to have static huffman coding to the quantized char array which is composed of reserved direct current component and basic wave and each high frequency " s amplitudes and angles. the other is to use discrete wavelet transformation to convert the source signal from time domain to frequency domain and to set the high frequency coefficients that its absolute value is smaller than the given threshold to zero, then to have dynamic huffman coding to the quantized char array which is composed of multiple, wavelet ' s level, datum length, low frequency coefficients and reserved high frequency coefficients. mass simulinks and analyses under the two circumstances have done to show that data compression ratio is small and the relative error is also small and within the permission of engineering and the compression problem can be solved in theory of measured datum of power system
第一種情況的壓縮方法為：採用傳統的傅立葉變換把原始信號從時間域變換到頻率域，舍棄20次及其以上的高次諧波成分（保證了gb / t14953 ? 93d5 . 3要求） ，然後對保留的直流分量、基波和各次諧波的幅值和相角數據量化后和量化時分別乘以的倍數系數構成一個數組，以字元形式保存，採用靜態huffman編碼對變換數據進行壓縮；採用離散小波變換把原始信號從時間域變換到頻率域，然後對分解得到的高頻系數進行閾值量化處理，對乘以的倍數系數、小波變換的階數、小波變換后的低頻、各級高頻以及原始數據長度、量化后的低頻系數以及保留的高頻系數大小、位置構成一個數組，以字元形式保存，採用動態huffman編碼對這個文件進行壓縮。 -
The study of srs in non - linear optic fiber by simulink emphatically. the initial intensities of pump beam and stokes beam are similar, and small signal gain theory needs to amend have been pointed. srs comply with the special growth law, does not have " threshold " characteristics. lt depends not only on the intensity of pump beam but also on the intensity of stokes beam itself. even if the intensity of pump beam is weak, fhe srs effect is maybe still take place. in addition, the problem about srs effect depends on the number of channels, power in each channel and space of the channels, in a dwdm system has been studied
並著重論述了如何利用simulink研究非線性光纖光學中的受激喇曼效應，指出在光纖通信的情況兩個光束的初始強度相差不多時，小增益理論需要修正。 srs遵從特殊的增長規律，並不具有「閾值」特性。 stokes束的增長不僅依賴于泵浦波的強度，而且也和自身的強度有關系。 -
The linear theory of the coaxial disk - loaded cylindrical waveguide twt is built and the dispersion equation with an annular electron beam of this twt is obtained according to self - consistent field theory and the field matching method. the computation results of the hot dispersion equation indicate the relations between the electron beam parameters and the small signal gain
利用自洽場理論以及場的匹配方法，推導出此結構在小信號條件下的熱色散方程，討論了電子注參量和慢波系統幾何參量與小信號增益和色散的關系。 -
Secondly, basing on the theory of on - off gain of small signal, the raman gain coefficient for frequency shift between 0. 5 and 20 thz of standard sigle mode optical fiber is measured by pump - probe method through a super luminescent diode ( sld ) as a broadband small signal probe source. thirdly, numerical simulation analysis of gain characteristic of raman fiber amplifier for c band wdm signal light is made according to the raman gain coefficient of the fiber measured before through target and four rank runge - kutta method. at the invariability of wavelength and maximum power of each of two pumps, schematic of powers of two pumps for best flatness on c band wdm optical gain was found out, at the same time, the factors of resulting in gain saturation is analyzed, too
本文首先應用經典的電磁理論對拉曼光纖放大器的工作機制進行了分析，然後，根據小信號理論推導出的開關增益求出了光纖拉曼增益系數的表達式，採用泵浦-探測波的方法，利用超輻射激光二極體（ superluminescentdiode簡稱sld ）作為探測光源，測量了所用標準單模光纖頻移為0 . 5 - 20thz的拉曼增益系數，之後根據所測得的光纖的拉曼增益系數譜對應用該類光纖構成的放大c波段wdm光信號的拉曼光纖放大器的增益特性採用打靶法和四階龍格- - -庫塔進行了數值計算，在給定了兩個泵浦光源的波長和最大功率后，找出了反向泵浦情況下使c波段wdm光源增益最平坦的兩個泵浦的各自最佳功率，同時也分析了導致信號光飽和的原因。 -
5 ) this dissertation presents new predictive models for the transient stability and small signal stability based on support vector machine theory that can solve the problems such as finite samples. a new method of feature selection and sample condensation is proposed to build predictive model which improves the practicability of the model greatly
5 ）論文首次利用基於小樣本技術的支持向量機理論，設計了新的暫態穩定、小擾動穩定特徵值預測模型，提出了新的適合預測模型構建的特徵選擇、數據采樣策略，提高了模型的實用性。 -
Average circuit model is the main modeling method and three - terminal small - signal modeling method is also used in this paper. pspice and matlab are used to analyzed the principles with computer and the simulation results are in positive with the theory
本文以平均等效電路法作為建模的基本方法，採用了pspice和matlab模擬軟體對上述理論進行計算機模擬試驗，驗證了理論的正確性。 -
Faced with the fact that there is a great deal of noise in detecting signal when using small amplitude lasting sine current on field, a developed lease minimum squares method is adopted, which makes the parameters of sine sequence with known frequency picked up on the real time. at the same time, original signal is processed by using wavelet theory, gaining true information which responses to the coating quality
在小幅度正弦恆電流激勵檢測中，針對現場檢測信號含有大量噪聲這樣的情況，採用改進的最小二乘法，實現頻率已知的正弦序列參數的實時提取；同時利用小波理論對原始信號進行處理，得到反映塗層性能的真實信息。 -
Small signal model of one cycle controlled bridge switching power amplifier is established. the theory research results of one cycle controlled switching power amplifier show that the output signal follow the input signal linearly, and the control performance is decided by output filter
理論分析結果表明，單周控制開關功率放大器的輸出信號與輸入信號成線性變化關系，其控制性能由輸出濾波器決定。 -
The working principle of buck - boost is first introduced, and averaging model of non - ideal buck - boost converter is established. the design details for voltage loop were given and zero - pole compensation method from classic control theory was applied to the filed of power electronics. thus, small - signal model of closed - loop was established, with detailed design guidelines for correction network
本文介紹了buck - boost電路的工作原理，建立了非理想buck - boost平均法的模型，對整個電路進行了單電壓閉環參數設計的研究，實現了控制理論中零極點補償法在電力電子中的應用，建立了閉環小信號模型，總結了設計校正網路的步驟和具體方法。
分享友人