fast fourier transform (fft) 中文意思是什麼

fast fourier transform (fft) 解釋
快速傅里葉變換
  • fast : adj 1 緊 （opp loose）， 牢實的，堅牢的，粘得緊的，堅固的；固定的。2 忠實的，可靠的。3 耐久的；不...
  • fourier : n 1 傅立葉〈姓氏〉。2 Francois Marie Charles Fourier 弗朗瓦斯馬利沙利傅立葉〈1772 1837，法國空想...
  • transform : vt （使）變形；（使）變化[轉化，轉變]；變態，改變（性質、機能等），改造，改革；【數學】變換；【電...
  • fft : 地層流體測試
  1. The subregion with pure dielectric layers is analyzed by mol and the fast fourier transform ( fft ) is introduced to reduce the computing time, while the subregion with conductors is analyzed by fdfd to take advantage fully the superiorities of these two methods

    通過在純介質區域使用直線法，導體所在區域使用有限差分法分別進行求解，充分發揮兩種方法各自的優越性。由於在純介質區域中使用了直線法求解，因此該演算法具有計算時間與介質層厚度無關的突出優越性。
  2. In order to investigate the unsteady flow frequency domain performances of an axial flow compressor at different mass flow, rotating speed and blade row spacing, plus inlet flow distortion, and considering aerodynamic characteristics and stability of the compressor, the low speed research compressor ( lsc ) at college of energy and power in nuaa is used to carry out the experiment studies. a large amount of test data has been gained through dynamic pressure transducers embedded in the stator blades at the tip, middle and hub section, then fast fourier transform algorithm ( fft ) is applied to calculate the frequency data

    為探討軸流壓氣機在工作流量、工作轉速及動?靜葉排軸向間距變化時的葉片排流場非定常頻譜特性變化規律，並耦合進氣畸變的影響，同時與壓氣機氣動性能和氣動穩定性相關聯，作者利用南京航空航天大學能源與動力學院的低速大尺寸軸流壓氣機（ lsc ）試驗器，採取在靜子葉片表面埋入動態壓力傳感器的實驗方法，對葉尖、葉中和葉根三個截面的動態壓力進行了測量，獲得了大量的可靠的實驗數據。
  3. In light of the limitation of fast fourier transform ( fft ) for the method of traditional spectrum analysis to analyze the unsteady signal, wavelet and wavelet analysis are made for the typical unsteady process signal of starting up and shut down with the good characteristic of simultaneous localization in both the time and the frequency domains based on the field test on the vibration of two - row placed units in lijiaxia hydropower station, in which the signal is decomposed into different frequency band, and then the weak signal is caught and the dominant frequency is picked up for the analysis of the vibration source

    摘要基於李家峽水電站雙排機組振動的現場試驗研究，並且針對傳統頻譜分析方法傅立葉變換（ fft ）對于非平穩信號已力不從心這一缺陷，利用小波分析方法在時域和頻域上同時具有良好的局部化性質，通過對開停機這一典型非平穩過程信號進行小波及小波包分析，將其分解到不同頻帶內，獲取微弱信息和提取優勢頻率，並對其作振源分析，得出開停機初始時刻因水流不穩均出現強烈的振動現象，且低頻段信號能量最大，開停機過程水流脈動壓力和尾水渦帶擺動是引起定子基礎振動的主要原因。
  4. Fft fast fourier transform

    快速熱歐姆轉換
  5. In addition, based on fast fourier transform ( fft ), an effective and reliable carrier frequency detection method has also been designed in this thesis

    此外，論文還設計了一種有效可靠的基於fft的載波頻率測量方法。
  6. At first, the thesis discusses the hardware implementing arithmetic of fast fourier transform ( fft ) and some correlative problems need to be solved. and according to the thesis " design demand and characteristic of large - scale programmable logic device ( pld ), the thesis designs an implementing scheme of fft processing machine based on pld

    首先，論文研究了快速傅立葉變換（ fft ）的硬體實現方法以及有限字長效應等問題，並根據論文的設計要求和大規模可編程邏輯器件的特點，設計了一個基於可編程邏輯器件的fft處理機實現方案。
  7. The digitizer based on pxi bus uses fpga ( field programmable gate array ) to implement 256 points, radix - 2 dit fft ( fast fourier transform algorithm ). the design uses pipelining for fft processing and can accomplish sampling and processing signals of two channels at the same time. in the signal acquisition circuit, - a / d convector is used to enhance the precision of the signal sampling

    在本設計中，採用fpga （ fieldprogrammablegatearray ）實現了256點基2dit演算法復數fft （ fastfouriertransformalgorithm快速傅氏變換演算法）處理器，具有較高的速度和運算精度fft ，設計採用流水線處理方式大大的提高了處理速度，可實現對兩個通道輸入信號的并行採集與處理。
  8. So power systems harmonic analysis is a significant aspect of power systems research. power system harmonic analysis was realized usually with fast fourier transform ( fft ), but the method exits spectrum leakage, and can not analyse all harmonic parameters exactly, such as frequency, amplitude and phase, in particular has big phase error

    電力系統諧波分析通常都是通過快速傅立葉變換（ fft ）實現的，但是這種方法存在柵欄效應和頻譜泄漏，使計算出的諧波參數即頻率、幅值和相位不準，尤其是相位誤差很大，無法滿足準確的諧波測量要求。
  9. Three methods of digital signal processing algorithm are proposed to restrain the noise discussed, there are methods of fast fourier transform ( fft ), of moving self - correlation, and of least means

    這樣，就可以在周期性和相關性上，區分這兩類信號，並消除干擾。在此基礎上，在數字信號處理方面，本文提出了三種演算法用於抑制上述干擾。
  10. Among the different imaging algorithms, the range - doppler fft ( r - d fft ) algorithm, based on range - doppler theory, in which the fast fourier transform ( fft ) is employed to reduce compute burden, is widely used in various imaging radar because it can be easily realized in real - time application

    陸基成像雷達（ gbr ）作為isar成像技術的重要應用，其觀測目標具有速度快，慣性大，運動相對平穩等特點，針對這些特點，本文對isar成像運動補償方面作了較為深入的研究。
  11. It deduces the interpolation formula of simultaneous sampling datum calculated by the asimultaneous sampling datum and uses fast fourier transform ( fft ) technology to calculate harmonic parameters. in the end, it gives harmonic errors " datum and curves by means of math model and computer simulation

    在此基礎上，導出了用非同步采樣數據計算同步采樣數據的插值公式，並根據復序列快速傅立葉變換（ fft ）原理對插值后的采樣數據進行分析和計算，從而得到電網諧波參數。
  12. Though the two new methods can improve the effect of edge detection, they need the gabor and wavelet transforms which make the computation complex and cost much time and are not easy to used in real - time application. this paper presents an efficient fast approach to compute real discrete gabor coefficients by applying the fht ( fast hartley transform ) in gabor transform, also the fft ( fast fourier transform ) is proposed to used in compute the wavelet coefficients

    雖然gabor和小波的引入能提高邊緣檢測的效果，但往往因其計算的復雜性而受到限制，本文提出了一種有效的離散gabor變換演算法來計算有限離散實數信號的gabor系數，同時，也給出了基於fft的小波變換快速演算法，為理論的快速實現提供了可能性。
  13. The dynamical characteristics of ground soil and structure of frequency spectrum of ground micro - tremor in fuzhou and quanzhou of fujian province are studied in this thesis. the ground microtremor signals were observed, and the signals were analyzed by fast fourier transform method ( fft ). the characteristics of structure of frequency - spectrum and response of ground soil to frequency of ground micro - tremor are revealed, and the function with frequency - dependence and frequency - selection of micro - tremor for different foundation soil strata is also researched

    本文以福建省福州市區和泉州市區場地土的動力特性和地脈動頻譜結構為研究對象，對福州市區和泉州市區等地進行了場地地脈動的測試，利用快速傅立葉變換（ fft ）方法對觀測到的地脈動信號進行頻譜分析，研究了地脈動頻譜結構特徵及場地土對地脈動的頻率響應的特性。
  14. In addition, the emphasis of the thesis is the use of fast fourier transform ( fft ) in reactive power compensation

    研究的另一個重點是快速傅立葉變換在無功補償中的應用。
  15. The concepts of filtering and sampling power system voltage and current signals for harmonic analysis using the fast fourier transform ( fft ) algorithm by a digital signal processor are introduced

    軟體演算法方面，系統採用傳統的快速付立葉變換（ fft ） ，對採集的電壓和電流信號進行頻譜分析。
  16. But the computing amount of dft is so large that its practical use is restricted, especially real - time processing. in fact, we use fast fourier transform ( fft ) in practical engineering

    但龐大的運算量使得dft的實際應用，特別是實時處理難以實現，所以實際工程中用到的都是快速傅里葉變換（ fft ） 。
  17. Related techniques and their applications are briefly reviewed in this paper, the conventional cross - correlation algorithm and the cross - correlation algorithm based on fast fourier transform ( fft ) are discussed

    本文簡要地回顧了piv技術的一些典型演算法和應用，研究了基本互相關演算法和基於快速傅立葉變換的互相關演算法。
  18. This paper introduced the work principle for testing wood elastic modulus with fast fourier transform ( fft ) and the structures of the machine and test technical process, this machine can test fast and accurate

    摘要介紹了快速傅立葉變換（ fft ）技術敲擊板材檢測彈性模量數控檢測設備的工作原理及組成，並在此基礎上描述了檢測板材的工藝過程，說明該檢測設備具有準確快速等特點。
  19. The time - domain scattering is computed via fdtd method, which is particularly well adapted to frequency - dependent soil. this method is processed prior to a fast fourier transform ( fft ), which is performed to come back to the frequency domain

    主要包括用於有耗土壤和樹干計算的頻率相關fdtd演算法- （ fd ） ~ 2td ，以及吸收土壤凋落波的gpml吸收邊界，確立了樹干散射的時域演算法模型。
  20. In the first part, the research progress of cloud motion wind is introduced and the significance of the fourier phrase analysis technique was given. in the second part, based on fluctuation theory and fourier phrase analysis, the one - dim fourier analysis technique on cloud motion winds is deduced, and the error of the technique is analyzed. in the third part, basing on the one - dim fourier phrase analysis technique, the two - dim fourier phrase analysis technique is given, and improved the arithmetic of fast fourier transform ( fft )

    本文由六章組成，第一章介紹雲導風技術的研究進展和傅立葉導風技術的研究意義；第二章以波動理論和傅立葉變換為基礎，對一維傅立葉相位導風技術進行理論推導和誤差分析；第三章基於一維傅立葉相位法導風，給出二維傅立葉相位法導風的理論分析，並對該演算法進行了改進，加入了快速傅立葉演算法。
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