common frequency system 中文意思是什麼
common frequency system
解釋
共頻系統-
Mems ( micro electromechanical system ) has become one of the most rapidly development technologies. along with the rapid development of mems techniques, capacitive sensor is used widely whose capacitance changes small, which has put forward the new request to the measurement technique. the common measure for capacitance measurement is that convert capacitance to voltage, electric current or frequency. the area of polar plate of the capacitor becomes smaller and smaller, and the total capacitance of micro capacitive sensor is usually several pico farad only. as a result, its change amount is smaller
Mems （ microelectromechanicalsystem ）近年來發展最快的技術之一，隨著mems技術的快速發展，電容式加速度計的電容變化變化量越來越小，對檢測技術提出了新的要求。在電容式傳感器中，常用電容檢測電路是將其轉換為電壓、電流或者頻率信號。目前的微型電容傳感器的極板面積變得越來越小，電容總量只有幾個pf ，變化量就更小。 -
This thesis presents pc - base model motor automated testing system whose control part is consisted of pc and programmable logic device ( plc ) : pc controls the test process, intelligence measure instrument ; the plc executes the commands sent from pc. common three - coil motor, frequency motor, synchronal perpetuation magnetism motor can be tested by this system
本文介紹的電機測試系統是pc - base類型電機型式自動測試系統，它的邏輯控制部分由上位機（ pc機）和可編程邏輯控制器（ plc ）構成： pc機主要實現對整個試驗過程的控制、智能儀器控制和邏輯運算， plc主要執行pc機命令，實現對系統的繼電控制。 -
To avoid the serious electromagnetic interferer, the analog signals are transformed to frequency pulses which are transferred to the kernel of the system. in the measure of the groove voltage, the method of float - ground is adopted to avoid the high common signal and the range switch circuit is designed to solve the conflict of the wide dynamic range and the high precision. least square curvefit is adopted to reduce the system error
鋁電解生產現場電磁干擾非常嚴重，為此我們將需要測量的模擬信號就近轉換為頻率脈沖后再傳送到控制核心；採用浮地接入方式消除槽電壓信號中的共模成分；設計了量程自動切換電路以解決槽電壓的動態范圍寬和測量精度高的矛盾；用最小二乘法進行曲線擬和以降低測量的系統誤差。 -
It mainly include theory introduction and development status of container crane ' s electrical control speed adjustment system, technical advantages of full frequency control speed adjustment system, and the usage condition of large - size container crane ' s electrical control system by our national port machinery industry, represented by shanghai port machinery plant. the third chapter of this article introduces the choosing methods of crane electrical transmission schemes, comparison of common used electrical speed adjustment schemes, the application of the frequency control speed adjustment on port machines, etc. the fourth chapter of this article gives an investigation about the principle and implement method of on - vehicle and remote management system on large - size container crane
主要包括集裝箱起重機電控調速系統的原理簡介以及發展狀況、全變頻調速系統的技術優勢、以及以上海港口機械製造廠為代表的我國港口機械行業在大型集裝箱起重機電控系統的使用情況；本文的第三章重點介紹了起重機電氣傳動方案的選擇方法、常用電氣調速方案的比較、變頻調速在港口起重機上的應用等。 -
The common path defocusing 4f shearing interferometer in the system was constructed, which is fit for the dense plasma measurement. the advantages of this system consist in its stability and easy adjustment as the common path system and respective adjustability of shearing amount and stripe spatial frequency as m - z interferometer as well
設計了基於共光路結構的離焦4f剪切差分干涉儀，該干涉儀同時具有m - z型干涉儀的剪切量和條紋空間頻率分別可調的優點以及共光路結構的穩定性和易於調節的優點，使得在稠密等離子體的測量中，系統參數可以兼顧小的剪切量和大的條紋空間頻率。 -
The asi parallel system in this thesis is presented based on common voltage loop control. the system is made up of five paralleled modules based on high - frequency zero - voltage - switch 1kva asi
本文採用公用電壓外環方案，實現了五臺1kva基於高頻零電壓軟開關航空靜止變流器模塊的並聯輸出。 -
Each module is controlled by voltage - current two closed - loops. the common voltage loop controls system output voltage & frequency, and generates a common reference current signal
每臺航空靜止變流器模塊均為電壓、電流雙環控制，通過公用電壓調節器穩定並聯系統的輸出電壓及頻率，同時產生統一的模塊電流給定信號。 -
The frequency difference sensitivity of the modulation mode and the ability to overcome distortion by limiting amplitude of the signal and to overcome interference also affect the performance, too. in this paper, the relationship between the ability to overcome interference and the modulation mode is discussed at first. then the characters in some aspects specif ' ed above of some common modulation mode such as mfsk mpsk ofdm are studied. on this base, some according solutions to the problem of the different frequency - hopping system are put forward. in the past half of this paper, the realization scheme, pcrforemance and improving measures of ofdm are studied
本文首先較詳細地討論了跳頻抗干擾的能力與調制制度的關系，接著分別研究了幾種常用調制方式（ mfsk ， mpsk ， ofdm ）上述幾方面的性質，針對各跳頻系統存在的問題提出了相應解決方案，在本論文後半部分重點討論了ofdm跳頻系統的實現方案、性能及改進措施。 -
In chapter 1, the basic principle and structure of the integrated anti - interference data transmission system are introduced. in chapter 2, the theory of maximum likelihood ( ml ) carrier synchronization parameter estimation ( frequency estimation and phase estimation ) are expatiated, and the closed - loop recovery methods ( phase - locked loop, pll ) and some other arithmetic in common use are introduced
第二章對最大似然（ ml ）載波同步參數估計（頻率估計和相位估計）理論進行了闡述，對常用的閉環恢復法即鎖相環（ pll ）法和一些載波同步參數處理方法進行了介紹，並對常用的載波頻率估計方法作了分析比較。 -
Voltage current control system for common dc link in the ac dc ac frequency converter
交變頻器公用直流母線電壓電流控制系統 -
Laser system ' s stable condition and frequency function are gained by virtue of theoretical model of a three - mirror f - p cavity and semiconductor laser, and then the mathematical model of common self - mixing interference effect is established
由三鏡f - p腔理論和半導體激光器性質得到系統的穩態條件和輸出光頻率的求解方程，從而建立了自混合干涉的數值模型。
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