phase-difference method 中文意思是什麼

phase-difference method 解釋
相位差值法
  • phase : n 1 形勢，局面，狀態；階級。2 方面，側面。3 【天文學】（月等的）變相，盈虧；【物、天】相，周相，...
  • difference : n. 1. 差異，差別。2. 不和，爭論。3. 【數學】差，差額。4. 【邏輯學】特殊性。vt. 〈罕用語〉區別，使有差別。
  • method : n 1 方法，方式；順序。2 （思想、言談上的）條理，規律，秩序。3 【生物學】分類法。4 〈M 〉【戲劇】...
  1. And the explicit finite difference method, the combining method of the central difference method and newmark s constant average acceleration method, and the transmitting boundary are used. by comparing the acceleration determined by the several methods of the displacements or velocities, a computing method of acceleration employed the one side difference of velocity is more practicality in this research. corresponding to normal incidence of the body waves, p waves or svwaves, and rayleigh surface waves, two two - dimensional finite difference programs are compiled to compu te the dynamic response of two - phase media

    以土力學模型為基礎，利用以土骨架和孔隙流體的四個位移為基本未知量的數值方法去模擬二維飽水介質中的地震波傳播，採用了顯式差分方法（中心差分法和newmark常平均加速度法結合）和透射邊界，通過比較利用幾種差分格式求解的加速度結果，發現一種用速度單邊差分求解加速度的方法在本文研究中較為實用，分別編制了體波（ p波或sv波） 、 rayleigh面波輸入時求解兩相介質動力響應的兩個二維數值分析程序。
  2. After analysising three existed methods for phase difference correction on discrete spectrum, it is recommended to correct the spectrum containing small noise in engineer practice by the first phase difference correcting method ( performing fft analysis on two continuous original sequence ) with harming window

    綜合分析現有三種離散頻譜相位差校正方法，推薦在小噪聲工程實際中加hanning窗的第一種相位差法（采連續兩段信號作相同點數fft的相位差校正法）進行校正。
  3. Measuring method for phase difference based on digital analysis

    一種基於數字分析的相位差測量方法
  4. The single - observer passive locating method with phase difference rate of change and some key technologies - are studied in this dissertation on the applying background of locating remote slow offing targets with fast plane. this dissertation is outlined as follows

    本文面向快速運動的空中觀測平臺對海面慢速運動目標定位的特定應用背景，利用相位差變化率方法進行了單站無源定位體制和關鍵技術的理論研究。
  5. The methods of direction finding mainly include maximum ( minimum ) signal method, amplitude - comparison method, phase - comparison method and time difference method

    測向的方法主要有最大（最小）信號法、比幅法、比相法、時差法。
  6. Three finite - difference methods, i. e., stagger grid, implicit and explicit algorithms, are analyzed in detail. multi - grid algorithm is firstly introduced in elastic wave simulation, to solve for the stability problem inherent in stagger grid and implicit algorithm, also for the efficiency problem inherent in explicit algorithm, and the precision, stability and efficiency for simulation of elastic wave arc increased by multi - grid method. phase - delay method is provided to effectively absorb boundary reflection and increase efficiency for wave motion simulation, based on phase delay and amplitude decaying features along wave propagation

    在水平分層介質接收函數的波形反演研究的基礎上，本文系統闡述了非均勻介質中彈性波傳播數值模擬常用的三種有限差分方法：顯式差分、隱式差分和交錯網格法，首次將多重網格演算法應用於彈性波方程的數值模擬問題，克服了交錯網格法和顯式差分法穩定性差，以及隱式差分法計算效率低的缺點，大大提高了彈性波數值模擬的精度、穩定性和計算效率。
  7. Based on the unified recursive formula, the four algorithms included in this study are the central difference method, the newrnark ' s method, z - transform method, and duhamel ' s step integral method. the accuracy, the phase and other existent problem are studied in this paper. it is proved in this paper that the recursive parameters b1and b2are relate to the poles of theoretical transfer function

    分析中可以發現，中心差分方法， newmark中點加速度方法、 z變換方法及duhamel逐步積分法在精度范圍內其計算相位是沒有畸變的，中國地震局工程力學研究所頃土學位論文一但是中心差分方法， newmark中點加速度方法隨著采樣間隔及系統自振頻率的增大，系統的固有自振周期被改變，其傳遞函數的共振區域與理論傳遞函數的共振區域會發生分離。
  8. We can compensate the phase difference and subtract at the direction of ship noise, then the noise can be cancelled. the merit o f this method is simple, stable and efficient. the main contents are : 1

    首先介紹了噪聲抵消的一般方法，並且結合拖曳陣本艦噪聲的抵消問題研究了自適應法和雙線列陣相減法對本艦噪聲的抑制模型及原理。
  9. The method, combining the aff with sga, can accurately track the signal frequency and calculate the phase difference between two signals

    它將自適應funnel波器和滑動goertzel演算法結合起來，能夠精確地跟蹤信號的頻率，計算相位差。
  10. According to the features of the signal of cmf, i. e. the signal frequency varies in a small range and the signal is subjected to the harmonics, a digital method based on a digital phase locked loop is used to process the signals of cmf, tracks the change of the signal frequency and calculates the phase difference. the technique proposed by the u. s. patent has been improved and made the simulation

    針對科里奧利質量流量計信號的特點，即信號頻率在小范圍內變化和信號易受諧波干擾的特點，採用基於數字鎖相環的方法處理科氏質量流量計的信號，跟蹤信號頻率的變化，計算相位差，對美國專利提出的方法進行了改進，並作了模擬。
  11. In this method, the phase difference between two compared signals that have same nominal frequency can be converted into voltage signal by phase detector. the voltage signal varies linearly with the phase difference and can be displayed or recorded by some instruments

    此方法是將兩個被比對的標稱值相同的標準頻率信號之間的相位關系，通過線性鑒相器轉換成與它成線性關系的電壓信號，並通過相應的設備進行顯示紀錄。
  12. According to development of inland and abroad, a new measurement method has been put forward that make use of the periodic characteristic of the phase difference between two arbitrary frequency signals. in the light of lissajous graph, we complete comparison of radio frequency and microwave with 105 rates relationship in technique. on the ground of common characteristic of frequency signals, this method can be developed to comparison of microwave frequency and optical frequency to accomplish optical frequency measurement

    根據國內外的情況，提出一種新的測量方法：即利用任意頻率信號之間都存在著相互相位差周期性變化的現象，根據李沙育圖形的原理，在技術上完成了射頻到微波信號之間成10 ~ 5頻率關系的比對，再根據頻率信號的共性，將此方法推廣到微波到光頻信號之間的比對，以完成對光頻的測量。
  13. A hybrid migration method, named " fourier finite - difference migration ", is a post - stack depth migration scheme. the downward extrapolation operator is split into three operators : one operator is a phase - shift operator for a chosen constant background velocity, another operator is the well - known first - order correction term, and the third operator is a finite - difference operator for the varying of the velocity function. phase - shift downward extrapolation and finite - difference downward extrapolation preserves the advantage of phase - shift method and finite - difference method

    傅立葉有限差分（簡稱ffd ）偏移演算法是一種疊后深度偏移演算法，其向下延拓運算元是一種混合運算元，包括三項：一項是處理常速的相移運算元，一項是一階相移修正運算元，最後一項是類似45度方程的有限差分運算元，用來處理劇烈橫向變速。
  14. A new virtual calibrator for instrument transformer is presented. a phase difference correction method is applicable to correct electronic instrument transformer

    摘要介紹了一種新型的虛擬互感器校驗儀，它採用相位差校正法解決了校驗電子式互感器的問題。
  15. To investigate the effect of different laminar cooling patterns on the microstructure and mechanical properties of plates in rolling process, the changes in temperature and microstructure of plate in such cooling process were calculated simulatively by coupling finite difference method with microstructural evolution models, thus predicting the ferrite grain size and phase composition under different cooling patterns

    摘要為了研究層流冷卻方式對中厚板組織和性能的影響，用耦合有限差分和微觀組織演變模型模擬計算了中厚板層流冷卻過程中的溫度和組織變化，預測出了不同冷卻方式下的鐵素體晶粒尺寸和相組成。
  16. The method based on quadrature demodulation is studied and the equations used to calculate the frequency, magnitude and phase ( difference ) of signals are given. the author has designed two kinds of low pass filters ( lpfs ) and has studied two kinds of frequency - tracking methods

    研究基於正交解調的科里奧利質量流量計信號處理方法，給出了同時求出信號的頻率、幅值和相位（差）的公式，設計兩種濾波器，研究兩種跟蹤方法，並進行模擬和比較，得到較好的方案。
  17. The modified upwind difference method for two - phase entirely compressible miscible displacement in porous media

    多孔介質中兩相完全可壓縮可混溶驅動問題的修正迎風差分法
  18. The upwind finite difference method for compressible two - phase displacement problem

    可壓縮兩相驅動問題的迎風差分格式及其理論分析
  19. The claim has been made upon the results that the wmt method should be used in the area near the vertical, while the phase difference method in slant beams and a rule has been given to select among those two methods according to the " effect value " on condition the depth is known for the consideration of improving the measurement precision, this paper studies the factors which affect the toa measurements, and three expressions of precision has been introduced as to applications of phase difference method, this paper introduces an automatic hunting method based on amplitude power to get the range of echo arrival

    採用方差分析的方法，使用重復海試數據對wmt法和相位差法的優劣進行了分析，指出了垂直附近應該使用wmt法，而傾斜波束應該使用相位差法；給出了在深度真實值已知前提下wmt法和相位差法使用的判決準則，即根據效應值的大小來選擇。本文從提高測量精度角度出發，分析並驗證了影響toa測量精度的因素；給出了三種精度表示。在應用相位差法時，引入了一種基於幅度能量的區間自動搜索方法；實驗表明該方法能很好地確定回波到達的大概時間范圍。
  20. Measuring velocity of light using phase difference method

    相位差法測量光的速度
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