采樣方差 的英文怎麼說
中文拼音 [cǎiyàngfāngchā]
采樣方差
英文
sample variance-
Static mathematic model of drum accommodation and control is presented, and instruction model control strategy of sample intervals is presented based on differences between characteristic equations of lifting frame and characteristic equations of top and bottom board change among the sampling spots, the rules of this method are few, simple, easy to operate and meet controlling demands
給出了滾筒調控靜態數學模型，並根據調高機構的調控特徵方程與采樣點間頂底板變化特徵方程的差異，給出了在其采樣區間內的指令式控制策略，其方法的規則條日少、簡單易運算、符合實際控制要求。It makes sampling data regularized by means of man - machine interactive mode and procedure method, respectively. the driven data of the cutter guide is generated, which is based on sampling data processed. it proposes an intelligent data reduction algorithm which bases on the combination of straightness of curves, equidistance and distance deviation principle
首先採集並分析了內輪廓數據，分別運用程序處理方式和人機交互方式實現采樣數據點的規則化處理;根據處理后的測點數據生成磨頭驅動數據;並提出了一種基於曲線曲率、等距及距離偏差帶的自適應數據壓縮方法。Firstly introduced the basic theory and method with which the analog signal can be convert to digital form, including sampling theory and course, quantification and quantification error, coding, beside those we discussed some applications of sampling technology, the reason of frequency mixture and the method to eliminate it chapter 4 introduced analog mux - switch, for the reason of simpleness we only introduce it briefly
從第3章開始，對數據採集的基本理論進行討論，首先介紹了模擬信號數字化處理中的基本理論、方法，包括采樣過程、采樣定理、量化與量化誤差、編碼，還討論了幾種采樣技術的應用、頻率混淆產生的原因及消除措施。第4章，介紹了模擬多路開關。According to the geometry of slope measurements for the subjective wavefront optometer, a wavefont reconstruction model using zernike polynomial with normalization factor is put forward. based on householder transformation and gram - schmidt orthogonalization method, two methods for working out unknown zernike coefficients are bring forward. the error propagation parameter for the wavefront reconstruction model is deduced
深入研究了帶標準化因子的zernike多項式的性質;針對主觀式像差儀波前斜率采樣方案，提出了採用帶標準化因子的zernike多項式對眼測試波前進行重建的數學模型;提出了兩種求解方法，即基於householder變換求解法和基於gram - schmidt正交化求解法，用於確定重建模型中的未知模式系數;推導出了該波前重建模型對斜率測量誤差的傳遞系數。Based on fractional sampling method, a new super - exponential iteration decision feedback blind equalization algorithm for severely nonlinear phase distortion channels was proposed
因此針對嚴重頻率衰落和非線性相位失真通道，提出了一種分數采樣的混合盲均衡演算法，並獲得了較快的收斂速度和較小的剩餘均方誤差。( 5 ) method of bandwidth compression of holographic grating based on discrete spectrum and realization of a 1 / 8 bandwidth compression of holographic grating ( 6 ) holographic stereogram display that can be implemented using cgh and imaging process through capturing sequence parallax images based on result of computed basis fringe
採用空間頻率域的子采樣，計算了一個8倍的條紋函數壓縮編碼結果，並給出了簡單易行的解碼方式。 6 、利用獲得的基本條紋函數合成了一個基於序列視差圖像的立體圖顯示，實現了三維數據未知的物體的三維全息顯示。This article has studied the deficiency and shortcoming of various kinds of methods of the parameter measurement of transmission line at present, proposed the measurement under operation on the basis of gps, researched gps application way and error that may appear in the power system synchronal sampling, put forward the parameter computing technology based on the information of both sides of transmission line, which solved some problems that exist in the parameter measurement, especially the problem that exist in the zero - sequence parameter measurement of transmission line with mutual inductance
本文研究了目前輸電線路參數測量的各種方法，分析了其中存在的不足和缺點，提出了基於gps的輸電線路參數在線測量方法，研究分析了gps在電力系統同步采樣中的應用方式以及可能出現的誤差，在同步采樣的基礎上提出了基於雙端信息的線路參數計算方法，較好地解決了輸電線路參數測量中存在的一些問題，尤其是多回互感線路零序參數測量困難的問題。The safety of transmission line plays a important role in power system safety it is not only the requirement of ensure supply power reliability, but also the necessary precondition of enhance power system stabilization, to remove faulty line quickly and accurately, also keep non - faulty line continuous work when some transmission line faults current differential protection is a kind of simple, reliable and good - selective protection manner to any variety of transmission lines, power system development needs current differential protection apply to transmission lines, moreover the advancement of electric and communication technology enable current differential protection apply to transmission lines firstly, the paper discusses, analyses the research and application transmission line protection in detail, compare the principle and realistic presupposition of general line pilot protections secondly, because conventional current vector differential protection are influenced easily by load current and transitional resistance, in order to at the same time quicken protection act, the principle and criterion include work characteristic of differential protect based on fault component sampled values are studied, results shows that differential protect based on fault component sampled values excels general vector current differential protection in reliability, sensitivity and anti - saturation of current transformer in addition, synchronous current sampling methods at all terminals of line is analyzed and estimated lastly, the principle and criterion. also device design about current sampling values differential protection based on optical fiber communication, which apply to short transmission lines are concretely investigated,
基於基爾霍夫定律的電流差動保護無論對於何種形式的輸電線路都是一種簡單、可靠、選擇性強的保護形式，電力系統的發展使得電流差動保護應用於線路保護成為需要，而電子、通信技術的發展使得電流差動保護應用於輸電線路成為可能。首先，本文對目前線路保護的研究和實際應用情況進行了討論和分析，比較了常用線路縱聯保護的實現原理和實現條件及優缺點。其次，針對常規相量電流差動保護易受正常負荷電流和故障過渡電阻影響的缺點，同時為加快差動保護的動作速度，對基於故障分量瞬時采樣值電流差動保護的原理、判據、動作特性等作了討論和分析，結果表明基於故障分量瞬時采樣值電流差動保護在可靠性、靈敏度、抗電流互感器飽和方面明顯優于常規相量電流差動保護，對電流差動保護各端的同步采樣方法和數據通信也進行了分析和評價。The research on autonomous navigation and orbital keeping technology of geosynchronous satellites : selecting position vector in the inertia space and longitude, latitude, radial errors in the hill equation as state variables, the precision of orbit determination caused by track dynamic model error, sampling period, and sensor measurement and install error is analyzed
同步衛星自主導航與軌道保持技術研究：分別選取慣性空間位置矢量和採用hill方程表示的經、緯、向徑誤差作為狀態量，分析軌道動力學模型誤差、采樣周期以及敏感器測量、安裝等誤差對定軌精度的影響。Abstract : in this paper, the setting scheme of the current differential protection based on sampled values using fault component is investigated. the setting schemes of the resistance coefficient and the least trip differential current are discussed in detail. the probable protection setting values for the hv transmission lines are described. it testifies the feasibility for the applications of the protection to the hv transmission lines
文摘:對基於故障分量的采樣值電流差動保護制動特性曲線的整定方法進行了研究，詳細討論了其制動系數和最小動作電流的整定方法，同時對該保護在輸電線路中的應用進行了初步的估算，說明了該保護的優異性能。The thesis is focus on the research of the optical - fiber differential current protection that can adapt to the rapidly changing power grid. it mainly contains the following four parts : ( 1 ) theoretical analysis of some operation criterions and some factors that influence the operation of the differential protection. ( 2 ) simulation of a 500kv transmission line using emtp software
其主要內容是： （ 1 ）對影響差動保護靈敏度的各種因素和不同的電流差動保護判據進行了理論分析； （ 2 ）用emtp模擬軟體對差動判據進行了數據模擬，並用matlab對輸出結果進行了詳細的可視化分析； （ 3 ）分析、比較了國內外縱差保護的數據采樣同步方法； （ 4 ）對判據進行了實際的編程實現和動模模擬。Supported by heilongjiang province natural science foundation projects " research on the errors mechanism of time division a. c. power measurement " ( no. e9719 ), " research on theory of analog digital mixed sampling power energy measurement " ( no. e01 - 15 ) and foundation for university key teacher by the ministry of education " the research on the low audio frequency a. c. power measurement smart instrument " ( no. 1087 ), in this dissertation it is made that a systematic and deep study on power measurement model errors and instrument errors about analog sampling, digital sampling and mixed sampling measurement, and fully experiments about mixed sampling measurement
本學位論文在黑龍江省自然科學基金資助項目「時分割交流功率測量原理誤差產生機理的理論研究」 （編號： e9719 ） ， 「模擬數字混合採樣功率與電能測量的理論研究」 （編號： e01 - 15 ）和教育部高等學校骨幹教師資助計劃項目「中頻電功率測量智能儀器的研製」 （編號: 1087 ）的資助下，以電功率模擬采樣測量、數字采樣測量和混合採樣測量方法為對象，對電功率測量的原理誤差和儀器誤差進行了系統和深入的理論研究和有關的實驗研究。We propose in this paper an evaluation method for the transient performance of das, through the period signal, by utilizing the much smaller difference than sampling period between the multi - periods of signal and the multi - sampling periods, getting shorter equivalent sampling period ( i. e. higher equivalent sampling rate ), which is derived from input signal period and sampling period, and then, the problem that how to get the transient performance of das has been solved. the transfer function of das is then evaluated and identified, and practical test results are also presented
本文介紹一種方法，通過對其加載特定的周期性輸入信號，使用采樣周期的整數倍和信號周期整數倍間的微小偏差，獲得比實際采樣周期小得多的等效采樣周期，從而解決了數據採集系統瞬態響應特性的獲取問題；並進而獲得了數據採集系統傳遞函數的辨識和評價結果，實現了數據採集系統瞬態特性的總體評價。The synchronous rectifying and low power sampling technology is used to reduce the power consumption, flexible external loop compensation, error amplifier output clamp are adopted for better system large signal response. the piecewise slope compensation technology is employed to minimize the consequence of over compensation. the sensor resistor is externally connected, which realize output voltage programmable. the overheat protection and under voltage protection modules are integrated in the die to allow the reliable operation of the system
同時，電路設計採用同步整流技術、低功耗電流采樣技術降低功耗，提高轉換效率;採用靈活的外部環路補償技術、誤差放大器輸出嵌位技術以實現良好大信號特性;採用分段斜坡補償技術，消除不穩定因素，並最大程度地減小過補償帶來的問題;採用外接輸出采樣電阻的方式，實現輸出電壓的可編程。This part offers the correlative waveforms and data through debugging the hardware function under real - time sampling mode and random sampling mode, makes error analysis, finds the reasons that cause error, and gives some solutions to improve the performance of the circuits
分別在實時采樣方式下和隨機采樣方式下對整個硬體電路的功能進行調試，給出了相關波形、數據，並對結果進行分析，找出一些誤差產生的原因，提出相應的改進方法。In this paper, a new control strategy based on the adaptive deadbeat voltage space vector is presented. this control scheme has a lower sample frequency and a smaller difference between switch frequency and sample frequency. it has many advantages, such as producing zero vectors organically, tracing exactly, non - shaking, etc. and its dynamic response is better
對于電能質量調節器來講， pwm跟隨指令參考信號的控制性能在很大程度上影響著裝置的補償效果，本文選擇無差拍電壓空間矢量控制為系統控制策略，這種控制方法具有采樣頻率低，開關頻率與采樣頻率的差距小，能有機地產主零矢量、跟蹤精確以及無抖振等優點，動態響應快。At the same time, the method of disposal phase shift of ct by compensation is introduced. then the analysis and statistic of electrical power quality, the control scheme and compensating amount of capacitor for reactive power compensation are analyzed respectively. and in the paper, the control with a / y and the switch with ac contactor and solid state switch is valid measure not only for improving operate level economically and amending electrical power quality but also for avoiding of replacing switch frequently and decrease economic loss
然後對現有的演算法進行了詳細的分析、比較，篩選出既能滿足硬體要求又可降低投資、保證精度、簡化軟體的方案，確定了準同步采樣的方案，並通過對準同步采樣誤差的分析，提出了一種從45開始采樣，從而提高精度的采樣數據處理辦法，同時，對于電流互感器相位漂移提出了一種補償辦法，接著對裝置中電能質量分析與統計以及無功補償中電容器的補償量、投切原則也作了相應分析，其中對于無功補償採用y混合接線，並利用交流接觸器和固態開關共同投切電容，不但提高了經濟運行水平、改善了電能質量，而且有效的避免了頻繁更換開關，減少了經濟損失；最後，設計了裝置的硬體電路並繪制了相應的軟體流程圖。In local chemical exploration, the variance analysis of three - stage - model must be applied to estimate analytical uncertainly and sample - collecting error
摘要在區域化探中必須應用三層套合方差分析對樣品的采樣誤差和分析誤差進行統計分析。Sample error probably caused from data collection circuit of rf virtual frequency spectrum analyzer instrument was emphasized, and some kinds of selectable resolution scheme were presented, then these schemes of advantages and disadvantages were compared and summarized by the way of theory analyse, matlab simulation and practice validate and so on, at last, the optimum scheme of rf virtual frequency analyzer instrument was decided and adopted
重點對虛擬射頻頻譜分析儀中的數據採集電路可能造成的采樣誤差進行了分析，提出了幾種可供選擇的解決方案，經過理論分析、 matlab模擬和實際驗證等手段，對這幾種方案的優缺點進行了比較和總結，並最終確定了其中最適合虛擬射頻頻譜分析儀的方案。Chapter 2. the influence of symbol, frequency and carrier offset to ofdm system is analyzed according to ofdm principles and typical sync methods are given
第二章依據正交頻分復用技術的原理，分析了符號偏差，頻率偏差和采樣偏差對系統的影響，給出了典型的同步方法。分享友人