low frequency control 中文意思是什麼
low frequency control
解釋
低頻控制-
The second, at the high frequency primary coil, when switch turn on with control signal ( the spwm pulse is modulated ), in the positive or negative semi - period of low frequency modulation signal, transformer coil with same direction voltage. the magnetic flux of transformer core will increase step by step. at the end, it leads to magnetic flux saturation
二、在高頻變壓器原邊，當開關管接收控制信號脈沖列（經調制的spwm波列）導通時，在低頻調制信號的正半周或負半周內，施加在變壓器繞組上的是同一方向的電壓，變壓器磁芯中的磁通可能將級進地逐漸增加，導致磁芯飽和，造成磁偏或單向磁化，導致低頻電信號放大失真或由於很大的磁化電流而無法正常工作。 -
A cyclic radial shearing interferometer was used to diagnose the wavefront distortion of a laser system and an lcslm ( liquid crysnd spatial ligh modulator ) was used to control it. some results have been summarized as follows : l. according to the theory of scalar quanity diffeaction and the model of the random gaussian phase screen of low frequency wavefront, the effect of the low frequency wavefront with different rms gradient on the focal spot of a laser beam was studied
本論文在激光光束波前畸變檢測和控制上進行了新的探索，主要就空間相位調制環路徑向剪切干涉儀以及它對波前畸變的檢測和液晶空間光調制器及其對中頻段波前畸變的控制進行了研究，其研究的內容和取得的成果如下：一、根據標量衍射理論，結合低頻波前畸變的高斯隨機位相分佈模型，研究了不同均方根梯度低頻畸變波前對激光光束焦斑聚焦性的影響，並採用描述中頻段波前畸變的功率譜密度概念，模擬計算了它對激光焦斑旁瓣的貢獻。 -
Through the deep study of f. d. demello dynamic model of electromechanical transition and synchronous generator theory, we proposed a new control strategy of excitation device that can eliminate the negative - damping phenomenon, which is directly against the cause of producing negative - damping represented as low frequency oscillation in the system
通過深入研究f . d . demello機電暫態的動力學模型以及同步發電機理論，針對系統產生負阻尼即低頻振蕩的原因，我們提出了一種新的可消除負阻尼現象的勵磁控制策略。 -
The main circuit is consisted of 18 thyristors circuit and protection circuit. with the help of control subsystem, it can get the output of low frequency voltage ( current ) with the shape of sine wave ; the core of the control subsystem is the cpu of 87c196kc, and the synchronization circuit, the pulse - widen circuit, and the power - enlarged circuit form the accessorial subsystem of the control system. it possesses all the functions of digital triggering, digital tuning, analog / digital conversion ; the input transfer can isolate the input and output ; and the circumfluence reactor can reduce the circumfluence
主迴路採用由18個晶閘管組成的三相零式電路，並輔以晶閘管的保護電路，通過控制可以得到低頻正弦波的電壓（電流）輸出；控制迴路主要以87c196kccpu為核心，其外圍電路包括同步電路，脈沖拓寬電路，功率放大驅動電路等，完成了數字觸發、數字調節、模數轉換等功能；進線電源變壓器具有變壓和隔離作用；環流電抗器則實現了有效抑制主迴路瞬時脈動環流的功能。 -
The variable polarity power supply circuit uses two stages full - bridge inverter, the former inverter is regarded as a constant - current source with fast dynamic response, and supplys energy for the second one, and the latter one is to produce variable polarity current excellently, and low - frequency pulse current by variable polarity power supply is used to reduce input energy and control the shape of weld bead while welding. a series of high - frequency pulse current is superposed on direct - current - electrode - negative ( dcen ) current through the high - frequency pulse power supply, which is used to compress the arc and improve process of crystallization
其中變極性電源採用二次全橋逆變結構，一次逆變提供快速的響應速率並給二次逆變提供能量，二次逆變提供良好的變極性性能，使輸出能量最優化，並用其低頻電流特性減小電弧線能量，控制焊縫成形;高頻脈沖電源提供的高頻電流疊加在反極性電流dcen上，利用電流的高頻特性壓縮電弧，改善焊縫金屬結晶過程。 -
And classic pid control method and numerical pid control method have been introduced in the paper. the paper adopt stabilization border method to set the pid parameters and simulates the control system which is based on matlab / simulink. simulation results indicate that pid control ’ s simulation results have a good effect in low - frequency stage, but it is not perfect in mid - frequency and high - frequency stage
採用穩定邊界法實現對pid參數的整定，並基於matlab / simulink對控制系統進行了模擬，模擬結果表明:低頻段pid控制正弦跟蹤曲線取得了良好的效果，而在中頻和高頻段時的跟蹤效果不是很好， pid控制的階躍響應超調量較大， pid控制三角波曲線的高頻性能也不理想。 -
Low frequency rfid tags are used in identifying animals and identifying beer kegs for example while higher frequency tend to be used to keep track of library books and microwave tags used to control vehicles remotely
舉例來說，低頻率rfid標簽可用以識別動物及啤酒桶，高頻率標簽則可在圖書館使用，以追蹤書籍，而微波標簽可以遙控汽車。 -
This thesis focuses on analysis and control of low - frequency electromechanical oscillations in power systems based on prony ' s method. the main work is as follows : 1
本文以基於prony法的電力系統低頻振蕩分析與控制為研究內容，主要做了以下工作： 1 -
The microprocessor is used to realize digital control as flip plus of the scr. the ic chip sa866ae of mitel company is utilized as the low frequency signal generator of the system. furthermore in the zero - current detection circuit, use the photocoupler gaalas ired and photo ic to detect zero - current, furthest shorten the commutating " died region ", prevent the current from distorting
設計中採用單片機控制可控硅的觸發脈沖，實現數字化控制，並利用mitel公司的三相pwm交流電機脈寬調制晶元sa866ae ，成功研製了交-交頻器中的低頻信號發生器裝置，效果良好；此外利用用光電檢測元件進行系統零電流的檢測，盡可能地縮短換相死區，防止電流發生畸變，成功地解決了原有低頻電源系統中存在的兩大難題。 -
Compared with the similar research results, the weighted control ic here has the following characteristics : ( 1 ) the circuit structure is simpler ; ( 2 ) the chip ' s fabrication is compatible with standard cmos process ; ( 3 ) n - mosfets with high w / l ratio and short channels are used for weighting and output to reduce the insertion loss ; ( 4 ) the weighting factor varies in a relatively wide range with the controlling signals ; ( 5 ) input and output impedance approach 50 in low frequency ( e. g. 50mhz ), while in higher frequency they slightly deviate from 50, hence the energy reflection lower than 0. 1 ; ( 6 ) it completes the functions of sampling, weighting, controlling and summing of high frequency analog signals
它的加權控制電路與已報道的相關電路相比具有如下特點：電路結構簡單；製造工藝與普通cmos工藝兼容：短溝道，高寬長比的nmos晶體管具有低的通導電阻，將其作為加權、輸出器件可降低由電路引起的插入損耗；改變加權信號，可實現權值在較大范圍內的連續變化；輸入、輸出阻抗在低頻（如50mhz ）下接近50 ，而在高頻下略有偏離50 ，但反射系數均低於0 . 1 ；實現了對高頻信號的取樣、加權、控制、疊加功能的迭加。 -
By the usage discovers the existing synchronous controller while near to resonance area and the low frequency areas of vibrate the pedestals, drive the signal and the feedback signalses all very small, control result is not very ideal
經過使用發現現有同步控制器在接近振動臺的共振區和低頻區時，驅動信號和反饋信號都很小，對幅值和相位的控制效果不能滿足要求。 -
At the end of the thesis, the review on the developments of low - frequency square wave electronic ballast is given. then a novel two - stage low - frequency square wave electronic ballast for hid lamps is proposed with detailed proposed circuit analysis and control circuit description. finally simulation and experimental results are provided to verify its superiority
論文最後對低頻方波電路的發展概況作了綜述，在此基礎上提出了一種新型的兩級式低頻方波電子鎮流器，並對其工作原理及控制電路進行了詳細的分析，最後通過模擬和實驗結果對電路進行了驗證。 -
The dynamic simulating system used to do the research of governor control had been established by the device. the dynamic simulating tests of gahc used on steam turbine and hydro turbine had been done with the device. the tests were three phases short circuit, restoring synchronous operation and restraining low frequency oscillation in three - machines system
利用該裝置對gahc在汽輪發電機和水輪發電機上的控制進行了以下動模實驗：單機無窮大系統中三相短路故障實驗和發電機發生失步故障后的再同步實驗、三機無窮大系統中抑制低頻振蕩的動模實驗。 -
The control of the spatial mid frequency wavefront distortion was achieved based on our cri wavefront sensing and lctv wavefront correcting system. the results of our research show that crs interferometer can be used to diagnosing the mid and low frequency wavefront distortion of a laser beam and lcslm can be used to availably controlled it
通過以上研究，說明我們建立的環路徑向剪切干涉儀可以用於icf激光驅動器的中低段波前畸變的檢測，並且液晶空間光調制器可用於它的前級中存在的中頻段波前畸變的校正。 -
Starting with your eq flat, remove all be bottom end by turning the low frequency control to full cut
在開始得時候，讓你得eq保持賓士（歸零） ，然後對低頻做低切 -
The multiresolution method is extended and applied to random vibration control system, thus a multiresolution random vibration control algorithm is created, which provides a satisfied solution to the poor control precision problem at low frequency that was pointed out and remained unsettled for many years. the control algorithm has been successfully implemented on dactron ' s shaker control system, showing great improvement in low frequency control precision, with a little more computation resource consumed. high resolution octave analysis is another successful application of multiresolution spectrum estimation theory
在多抽樣率信號處理理論和多分辨譜估計理論的基礎上，本文進而將多解析度思想推廣到隨機振動控制理論中，提出了多分辨隨機振動控制演算法，解決了振動控制界多年來懸而未決的低頻控制精度問題，並在dactron公司laser ~ （ tm ）和comet ~ （ tm ）等多種振動控制產品中得到了成功的應用，在計算量增加不大的前提下取得了令人滿意的控制效果。 -
The purpose of this thesis is to study the large range low frequency vibration control of benfield system frame in jianfeng ammonia plant
本文的研究目的是控制建峰化肥廠合成氨裝置苯菲爾框架大幅低頻振動。 -
Using subdivided control method in the system can markedly decrease low frequency vibration of the motor, and can enhance motor ' s accuracy
步進電機細分控制策略能夠有效地克服電機低頻振動的問題，提高了電機在中、低速運行時的性能。 -
Based on the discussion of the nonlinearity of the vibrator, the mathematic model of ultra - low - frequency vibrator is established. then, on the basis of the ziegler - nichols pid controller, pid control parameters are modified according to the control requirements of object, and the computer simulation is done. finally, low - frequency feedback system is built up, which solves the problem of high distortion of the output of vibrator under ultra - low frequency
從分析標準振動臺在超低頻時的非線性因素入手，建立了超低頻標準振動臺的數學模型；然後在zieglernichols法設計pid的基礎上，根據控制對象的性能要求修正了pid參數，並作了模擬研究；最後設計出低頻反饋系統，解決了振動臺超低頻失真度較大的問題。 -
Heavy interference ， changeable variables and load are the characteristics of film supply system and film receipt system. resolutions for these problems are emphasized in this paper. as usual, the effective method to solve the heavy interference in low frequency and the changeable load is compound control for disturbance compensation
供片、收片張力伺服系統具有變參數、變負載、強擾動的技術特點，解決這些問題是本論文的重點內容。通常情況下，在解決低頻強擾動、變負載問題方面，最有效的方法是採用按擾動補償的復合校正方式。
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