space frequency modulation 中文意思是什麼

space frequency modulation 解釋
空間頻率調制
  • space : n 1 空間；太空。2 空隙，空地；場地；（火車輪船飛機中的）座位；餘地；篇幅。3 空白；間隔；距離。4 ...
  • frequency : n. 1. 屢次，頻仍，頻繁。2. （脈搏等的）次數，出現率；頻度；【物理學】頻率，周率。
  • modulation : n 調整，調節；（聲調的）抑揚，變化；【音樂】轉調，變調；【無線電】調制。 amplitude modulation 振...
  1. Furthermore, in order to supplement multi - object tt & c capability of new generation space tt & c system, gmsk modulation is recommended by ccsds because of its preferable frequency speciality and miscode performance. the thesis analyzed characteristic and demodulation realized of gmsk signal. attempting to design a universal multi - mode demodulator of bpsk, qpsk and gmsk, the thesis studied

    本文分析了gmsk信號的特點及解調實現，試圖設計一種bpsk 、 qpsk 、 gmsk通用的多模式解調器，因而研究了調制識別技術，分析了以決策論為基礎的三種信號的調制識別方法，並提出了基於人工神經網路的調制識別方法。
  2. The temperature range is - 30 ~ 80. the topology of the step - up dc / dc converters and its basic principle is first analyzed in this thesis. then based on the conventional pfm control scheme, a discrete pulse frequency modulation is presented and the state space average model related to the ccm ( continue current mode ) and dcm is established

    然後在傳統的脈沖頻率調制方式的基礎上，分析了一種離散脈沖頻率調制方式，並建立了這種調制方式下升壓型dc / dc變換器在電流連續（ ccm ）工作模式和電流斷續（ dcm ）工作模式的狀態空間平均模型。
  3. This paper expatiated that the mathematics models of ac motor is higher order, non - linear and closed coupling, multivariable input - output system. and introduces the principle and the algorithm of sine pulse width modulation ( spwm ), opened - loop space voltage pulse width modulation control ( svpwm ) and field oriented control ( foc ). finally, realized the control strategies of variable - frequency speed regulating using assembly and c language

    文中闡述了交流異步電機的數學模型是高階、非線性、強耦合的多變量輸入輸出系統，介紹了交流電機的正弦脈寬調制、開環電壓空間矢量的u / f控制和磁場定向控制的原理及控制演算法，並利用dsp構成控制系統，通過匯編語言和16位定點c語言混合編程的方法實現了上述的變頻調速控制策略。
  4. After introduce the main technologies of ac regulation speed, the paper deduces in details the voltage space vector pulse width modulation ( svpwm ) technology and svpwm ' s vector selection of constant ratio of voltage and frequency

    本文在介紹了交流調速系統的種種主流技術后，較為詳細地討論了電壓空間矢量脈寬調制（ svpwm ）技術，並對恆壓頻比且為同步調制時的svpwm矢量的選擇，進行了細致地推導。
  5. People can easily design the hysteresis current control hardware circuit, but the switching frequency is variable which makes us difficult the design the output filter, moreover the output waveform is not good. the space vector modulation techniques, by selecting the zero vector properly, it can reduce the harmonic content of the output voltage, so it has become a popular control method

    滯環電流控制的硬體電路設計簡單，但存在開關頻率不固定，輸出濾波器設計困難，輸出波形質量差，空間矢量控制（ svm ）技術具有較高的電壓利用率，且通過對零矢量的合理控制可以降低諧波含量或降低開關損耗，因此是一種較好的控制方法。
  6. Besides these, it is capable of performing frequency conversion with sinusoidal output voltages and currents at the desired output frequency and allows bi - directional power flow according to the space vector modulation method of the equivalent structure of the ac - dc - ac conversion, the conversion relations of the matrix converter were deeply investigated. the ac - ac direct transformation control and the double - space - vector pwm scheme of the matrix converter were deduced and the modeling, sin ~ iu1ation and experiment of a three - phase matrix converter were implemented

    本文從等效交一直一交變換的空間矢量調制方法出發，深入分析了矩陣式變換器的變換關系，推導出了交一交直接變換控制規律和雙空間矢量pwm調制技術，實現了交一交直接變換控制方式下矩陣式變換器的建模和運行分析，並進行了計算機模擬和實驗研究。
  7. In order to solve the problem of direct torque control ( dtc ) for permanent magnet synchronous motor ( pmsm ) related to the flux and the torque ripple and the uncertainty of switching frequency, a method which shorten the voltage - vector - function - time by svm ( space vector modulation ) is developed, and in order to improve the system performance, the stator flux linkage sectors and vectors are subdivided

    摘要為了解決永磁同步電機傳統直接轉矩控制低速時磁鏈和轉矩脈動大的問題，提出了1種用空間矢量調制（ svm ）實現減小電壓矢量在1個控制周期中的作用時間的直接轉矩控制方法;為進一步提高系統性能，對磁鏈扇區和電壓矢量進行了細分。
  8. " modulation domain " ( mod ) is a plane domain which is consisted of frequency and time of signals. it is a necessary field to measure signals in three - dimension space of signal ( time domain, frequency domain and modulation domain )

    調制域是由信號的時間和頻率兩個軸構成的平面域，是對信號進行三維（時域、頻域、調制域）測量不可缺少的一個測試域。
  9. Down link channel of new generation space tt & c system generally select qpsk as its modulation mode. firstly, carrier synchronization of qpsk is studied in the thesis, and then the key question - carrier synchronization in low snr and severe doppler frequency shift is systemic analyzed. in addition, different existing project are analyzed and compared

    新一代航天測控系統的下行通道一般選擇qpsk作為其信號調制方式，本文首先研究了qpsk的載波同步問題，對其中的關鍵問題? ?低信噪比及大多普勒頻移情況下的載波同步進行了系統的分析，對現有的不同方案進行了分析與比較。
  10. Speed sensor has the limitation of high cost, taking up more space, low reliability and high dependency of working condition. speed - - sensorless frequency modulation system avoids those defects and can meet the need of high performance of ac motor driving which is a stress field

    無速度傳感器變頻調速系統既避免了速度傳感器帶來的成本增加、體積增大、可靠性降低、易受工作環境影響等缺陷，又能夠滿足高性能交流傳動的需要，是運動控制發展的一個重要方向。
  11. Design of matrix variable frequency power source with dsp - based space vector modulation

    空間矢量控制的矩陣變頻電源設計
  12. This paper investigates the induction motor full digital ac frequency conversion system, and develops an ac motor experiment platform based on dsp tms320f240, the software and hardware implementation of the system is discussed in detail. the industry computer controls the dsp to output the space vector pulse width modulation voltage wave ( svpwm ) onto the induction motor. using this software we can view the state variable waveform on the pc and modify the variable in the dsp memory

    本論文結合「基於dsp的交流電機實驗控制系統」實際科研項目，開發出基於dsp的全數字交流電機實驗控制平臺，給出了該系統平臺的軟硬體設計方案，該系統使用工控pc機對下位機dsp進行實時控制，在dsp中依據選定的電機控制策略程序，發出空間矢量脈寬調制形式的電壓波形，實現對交流電機變壓變頻控制；在上位機中能實時查看變量波形，並對dsp內存變量進行修改，在該平臺上能方便的使用軟體實現各種高性能的電機控制演算法。
分享友人
分享到 Line

分享到臉書