頻率恆定性 的英文怎麼說

中文拼音 [bīnlǜhéngdìngxìng]
頻率恆定性 英文
constancy of frequency
  • 頻 : Ⅰ形容詞（次數多） frequent Ⅱ副詞（屢次） frequently; repeatedly Ⅲ名詞1 [物理學] （物體每秒鐘振動...
  • 率 : 率名詞（比值） rate; ratio; proportion
  • 恆 : Ⅰ形容詞1 （永久; 持久） permanent; lasting 2 （平常; 經常） usual; common; constant Ⅱ名詞1 （恆心...
  • 定 : Ⅰ形容詞1 （平靜; 穩定） calm; stable 2 （已經確定的; 不改變的） fixed; settled; established Ⅱ動詞...
  • 性 : Ⅰ名詞1 （性格） nature; character; disposition 2 （性能; 性質） property; quality 3 （性別） sex ...
  • 頻率 : frequency; rate
  1. This instrument keeps constant temperature by circling air both. it use computer to control temperature and oscillation frequency, led digital display, it has stable performance, and its quality is reliable, its appearance is beautiful and digniful. it can be operated conveniently. it is the suitable instrument uhcih is used on researching and production by the trades of bioengineering. medicine. hygienist and so on

    該振蕩培養箱是利用旋轉空氣浴進行恆溫的振蕩器，溫度和振蕩頻率均採用電腦控制，用led數碼顯示.該振蕩器性能穩定，質量可靠，造型美觀大方，操作方便，實為生物工程、醫藥、衛生等行業科研和生產中使用的理想儀器。
  2. By theory and practice simulation, the several types of constant envelope modulation techniques are analyzed and compared, including theirs modulation principle, phase path, the modulated wave envelope, power spectrums, error bit rate and the influence of its power spectrums of the band - limited and non - linear, etc. especially we have researched the ijf - oqpsk modulation technique, and the performance of its inter - symbol interference and time jitter free, and its strongly resisting of spectral spreading

    結合理論和實驗模擬結果，分析討論了衛星通信中的各種恆包絡調制技術，對它們的調制原理，相位路徑，已調波包絡，功率譜密度，誤碼性能，以及帶限非線性通道對其功率譜的影響等方面都作了研究和比較。特別研究了ijf ? oqpsk在消除碼間干擾和定時抖動方面的性能及其優良的旁瓣特性和抑制頻譜擴展特性。
  3. Secondly, to achieve the independent regulation of active and reactive power output from the generator side which is designed for the purpose of tracing the maximum wind - energy capturing. the paper has analyzed the mathematic model of the ac excited doubly - fed machine and the stator field orientation control strategy of the motor as vscf wind power generator. thirdly, it has put forward and designed the dual pwm converter with the capacity of energy flowing bidirectional aimed at the demand of rotor energy bidirectional flow. the author constructed reliable and integrated experimental system and did a series of experimental study including no - load, cutting - in network and power generation at, below and above the synchronous speed

    論文首先分析了風機運行特性及其最佳風能利用原理，通過模擬及實驗驗證了採用直流電機的輸出特性模擬風力機的最大輸出功率曲線的可行性，並給出了模擬系統的硬體結構；然後為了實現交流勵磁發電機有功、無功功率獨立調節機理，分析了交流勵磁雙饋發電機的數學模型和在追蹤最大風能捕獲變速恆頻風力發電時必需的定子磁鏈定向矢量控制策略；針對雙饋發電機轉子能量雙向流動的要求，提出並設計了具有能量雙向流動能力的雙pwm交流勵磁用變頻器；最後為實現從理論到實踐的全面研究，研製出了一套小功率完整的雙pwm變頻器交流勵磁的雙饋風力發電機實驗系統，進行了空載、並網、同步速及上、下的發電運行等一系列的運行實驗；所完成的模擬和實驗研究均驗證了理論、模型和控制策略的正確性、可行性。
  4. It also builds the mathematic model of all section of vscf ac exited wind power generation system on a - b - b and d - q coordinate system by the coordinate commutation technology. the thesis gives the characteristics of torque, active power, reactive power and the steady - state analysis of it. it proves that the capability of wind generator is determined to slip, the amplitude and phase of rotor voltage, the phase dispatch between stator voltage and rotor voltage

    並分析了交流勵磁風力發電機作變速恆頻運行時的工作原理，闡述了與同步發電機、異步發電機的不同之處，分析了其能量平衡關系，在坐標變換技術的幫助下，詳細推導了交流勵磁發電機在a - b - c坐標系和d - q坐標系下的數學模型，分析並模擬了其有功和無功特性、轉矩和功率調節特性、穩態運行和機械特性，證明了發電機的性能由轉差率、轉子電壓的相位和幅值、定轉子電壓相位差所決定的。
  5. This series employs knot - shaped bi - phase system of high frequency driver, co - axial technology, constant pointing horn to obtain even transmission of frequency within pointing angle, and near / far field strength - adjustable dance horn technology

    採用了高音驅動器的「桔狀雙相位系統」 、同軸技術、在指向角范圍內得到均勻傳送頻率特性的恆定指向性號角，遠近聲場可變強度舞蹈號角技術。
  6. The thesis has done the widespread investigation and study to the domestic and foreign ’ s technologies of analogy low voltage and low power, and analyzes the principles of work, merts and shortcomings of these technologies, based on the absorption of these technologies, it designs a 1. 5v low power rail - to - rail cmos operational amplifier. when designing input stage, in order to enable the input common mode voltage range to achieve rail - to - rail, it does not use the traditional differential input pair, but use the nmos tube and the pmos tube parallel supplementary differential input pair to the structure, and uses the proportional current mirror technology to realize the constant transconductance of input stage. in the middle gain stage design, the current mirror load does not use the traditional standard cascode structure, but uses the low voltage, wide - swing casecode structure which is suitable to work in low voltage. when designing output stage, in order to enhance the efficiency, it uses the push - pull common source stage amplifier as the output stage, the output voltage swing basically reached rail - to - rail. the thesis changes the design of the traditional normal source based on the operational amplifier, uses the differential amplifier with current mirror load to design a normal current source. the normal current source provides the stable bias current and the bias voltage to the operational amplifier, so the stability of operational amplifier is guaranteed. the thesis uses the miller compensate technology with a adjusting zero resistance to compensate the operational amplifier

    本論文對國內外的模擬低電壓低功耗技術做了廣泛的調查研究，分析了這些技術的工作原理和優缺點，在吸收這些技術成果基礎上設計了一個1 . 5v低功耗軌至軌cmos運算放大器。在設計輸入級時，為了使輸入共模電壓范圍達到軌至軌，不是採用傳統的差動輸入結構，而是採用了nmos管和pmos管並聯的互補差動輸入對結構，並採用成比例的電流鏡技術實現了輸入級跨導的恆定;在中間增益級設計中，電流鏡負載並不是採用傳統的標準共源共柵結構，而是採用了適合在低壓工作的低壓寬擺幅共源共柵結構;在輸出級設計時，為了提高效率，採用了推挽共源級放大器作為輸出級，輸出電壓擺幅基本上達到了軌至軌;本論文改變傳統基準源基於運放的設計，採用了帶電流鏡負載的差分放大器設計了一個基準電流源，給運放提供穩定的偏置電流和偏置電壓，保證了運放的穩定性;並採用了帶調零電阻的密勒補償技術對運放進行頻率補償。
  7. This method is easy to implement and has no restriction on array geometry and sensor patterns ; three methods for the design of broadband frequency invariant beamformer are proposed, which are the method of resampling signals received by the array, the dft ( discrete fourier transform ) interpolation method and adaptive synthesis method, respectively. examples and performance analyses are given for each method ; a simplified linear constrained minimum variance broadband adaptive algorithm that based on dft interpolation method is presented. compared with conventional broadband adaptive algorithms, the presented method can reduce computation work greatly

    提出了一種簡單、易於實現的恆定束寬波束形成器設計方法，該方法對陣形和陣元指向性沒有任何限制；分別提出了基於陣列接收數據重采樣、基於dft插值和自適應綜合的三種具有頻率不變波束圖的寬帶波束形成器設計方法，對于每一種設計方法都給出了一個設計實例並做了性能分析；提出一種基於dft插值的簡化線性約束最小方差寬帶自適應陣列演算法，該方法可以大大降低自適應陣列的運算量。
  8. In the simulation experiment, the whole system model is founded by the software matlab / simulink. using the stator active power computed from the maximal output power of the wind turbine as the reference value of vector control system, the result of experiment approves that the control strategy is true. not only the frequency of stator current is constant, but the control of stator active and reactive are decoupled, and the output power tracks the maximal power of wind turbine

    在最後的模擬實驗中，本文利用matlab軟體建立了系統各部分的模擬模型，選用與風力機最大輸出功率對應的定子有功功率作為矢量控制的參考值做了模擬實驗，並給出了模擬結果，驗證了定子磁鏈定向矢量控制策略的正確性：既保證了定子輸出頻率的恆定，又達到了有功功率無功功率獨立解耦控制的目的，同時還較好地跟蹤了風力機的最大功率輸出。
  9. Sszm500b straight line double edgers, and 90transfer taboe. 26 spindles on each sszm2500b. plc control system sets processing parameters via interface, and finishes processing at one time. this product has stable structure. precise and smooth transmission system, thetransmission belt drive adopts strong power and transfrequency motor to control speed, constant power, constantrele output and advanced epuipment to control, high polishing efficiency. it is the best matched equipment of large batch of furniture and decorated glass edge production, and production, and can be matched with gluing, printing, reinforcing, etc. production line

    才用plc控制系統通過界面設定加工參數一次完成加工，具有穩定扎實的底座結果精確流暢的傳動系統，傳送皮帶驅動採用大功率變頻電機調速控制，恆功率恆扭矩輸出和高配置的控制。結構緊湊，性能穩定可靠，拋光及生產效率高。是大批量的傢具和裝飾玻璃的磨邊生產的最佳配套設備，可以與夾膠印花鋼化等生產線配套使用。
  10. The fatigue crack propagation testing of mdyb - 3 pmma material under constant amplitude cyclic loading has been made. the effect of different stress ratios, room temperatures and loading frequencies were investigated in terms of the paris law presentations of the testing results

    本文研究了在恆幅正弦載荷下溫度、頻率和應力比對疲勞裂紋擴展的影響，給出溫度和頻率影響的定性分析，和應力比影響的定量分析，為建立疲勞裂紋擴展模型打下了基礎。
  11. Abstract : frequency automatic tracking and amplitude stabilizing are two important characteristics of ultrasonic machining power

    文摘:頻率跟蹤和恆定振幅控制是超聲加工電源兩個重要的特性。
  12. We equip the following machines for the environmental testing and the reliability test : test box with high and low temperature, test box with high temperature, test box with invariableness temperature and humidity, salt - spray test box, vibrant and impactive test machine, tensile test machine, frequency tester and scanner, oscillograph, oven with invariableness temperature etc. pic the 3d machine

    環境試驗可靠性測試等方面配置有以下儀器設備：高低溫試驗箱高溫恆溫試驗箱恆定濕熱試驗箱鹽霧腐蝕箱振動沖擊試驗臺拉力試驗機諧振頻率f0快速測試儀揚聲器f0快速測試儀音頻掃頻信號發生器示波器電熱恆溫乾燥箱等。
  13. Also ac exited generator have many excellent characteristics, it may improving the stability of electric power system, its rotor speed may adjustable, it have abilities for active and reactive power regulating in self - help ways, it not lose steps even when operated in deep lead phase, so it especially applied in wind electric power plant and pumped - storage hydraulic power plant

    交流勵磁發電機作為發電機運行的風力發電系統，利用變速恆頻技術后可大大提高風能的利用率。交流勵磁發電機可改善電力系統穩定性，轉子轉速可變，具有獨立的有功無功調節能力，可以深度進行運行而不失步，特別適用於風力發電、抽水蓄能電站等場合。
  14. The author firstly analyzed the mathematic model of the cascaded brushless doubly - fed machine ( cbdfm ) on the dq and mt coordinate rotating at rotor speed and synchronous speed seperatly, and the equivalent circuit of steady state. the author also analyzed the stator power winding flux oriented vector control strategy of the cbdfm as vscf wind power generator and validated the validity of the model and strategy by the simulation analysis

    此外，本文還首次詳盡地分析了級聯式無刷雙饋電機在轉子機械速dq坐標系、定子同步速mt坐標系下的數學模型，穩態等效電路及作變速恆頻風力發電機運行時的定子功率繞組磁鏈定向矢量控制策略，通過模擬分析驗證了模型和策略的正確性。
  15. Abstract : the multifunctional inverter power sourcethe handy inverter welding, plating & charging manchine, developed with advanced inverter and micro - electronics control techniques, adopts “ half - bridge power expansion supply midpoint voltage autocontrol setting ”, and technically and effectively having solved inverter subvision of inverter power expansion circuit for leaning magnetism, reliability of high - power inverter setting, achives combination of constantcurrent and constantvoltage export, and realizes low - voltage dc and high - voltage ac double power supply

    文摘:運用先進的高頻逆變技術和微電子控制技術設計研製的逆變式多功能電源便攜式逆變焊鍍充電多用機，採用「半橋式功放級供電中點電壓自動控制調節裝置」 ，在技術上解決了逆變功放電路因偏磁而造成的逆變顛覆，有效地解決了大功率逆變器的可靠性問題；進行多種外特性的綜合設定，實現了恆流與恆壓輸出的合一；與傳統焊機相比，實現了開環和閉環狀態下都互不影響的低壓直流電瓶和高壓交流雙供電
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