簡正頻率 的英文怎麼說
中文拼音 [jiǎnzhēngbīnlǜ]
簡正頻率
英文
normal frequency-
Third, other nuclear quanlities ( such as fission caused by slow neutron, odd - even difference of frequency of bandcrossing etc ) were researched briefly, no other than pairing correlation, their results represented a series of odd - even differences
（ 3 ）對原子核的其它性質（如慢中子引起的裂變，帶交叉頻率的奇偶差等）的奇偶差也作了簡要的研究，正是由於對關聯的存在，其他性質也表現出一系列的奇偶差。First, how to conduct sample and quantification of continuous time signal which is prior condition of sdr is explored in detail, and the comparison and analysis of some sample modes are given in which band pass signal sampling theorem is most important. second, multi - sample rate signal processing which is an important basis of sdr is studied. emphasis are put on decimation and interpolation those are the most fundamental process and the realization of decimation and interpolation filter
在基於中頻采樣的軟體無線電結構框架下，首先詳細探討了軟體無線電的前提條件，即如何對連續時間信號進行采樣量化，比較分析了幾種采樣的方式，其中最為重要的是帶通信號采樣定理；然後探討了軟體無線電的一個重要基礎，即多采樣率信號處理，重點討論其最基本的兩個過程抽取和內插以及抽取器和內插器的實現；接著介紹了結構簡單、適用於一級抽取的cic濾波器和適用於做2倍抽取的半帶濾波器；再次論文在總結了傳統的調制解調基礎上，結合軟體無線電器件的特點，系統的探討並實現了基於正交思想的am 、 fm 、 ask 、 fsk 、 bpsk 、 qpsk的正交調制解調演算法。An assumption is verified that the multi - path arrival time differences calculated by ray model is almost the same as that by normal mode model if higher frequencies for the source are used ( e. g., frequencies range between 600hz and 1600hz ). hi other words, the calculation of the multi - path arrival time differences by ray model is reliable. 2
該方法的研究結果驗證了一個重要的假設：當信號頻率較高時（例如600hz 1600hz ） ，用聲線模型計算多途到達時延差與簡正波模型得到的結果基本一致，並且聲線模型計算多途到達時延差具有較高的可信度。The control tactics of space voltage vector are investigated, and the simplified algorithm which judges the sector location of reference vector and calculates switch operation time is put forward. by analyzing the current hysteresis control, the relation between switch frequency, and hysteresis bandwidth and input inductance of pwm rectifier is deduced. by applying instantaneous power theory, the principle of pwm rectifier power control is analyzed, and the direct power control by matlab toolbox through estimating active power and reactive power with virtual flux is realized, and the simulation results prove that it is correct
對常用空間電壓矢量控制策略進行分析，提出了給定參考矢量所在區間判斷的簡化方法，以及電壓矢量作用時間的求取方法；分析了電流滯環控制策略，推導出開關頻率與滯環帶寬以及整流器輸入電感之間的關系；應用瞬時功率理論分析pwm整流器功率控制原理，通過虛擬磁鏈估計有功功率和無功功率，用matlab實現了直接功率控制，並驗證了該控制方法的正確性。Comprehensively discuss the issues in application, adaptive condition and performance, propose a fast arithmetic of forward modeling and depth migration in common shot gathers with one - way acoustic wave equation based on vrselrf, and verify the arithmetic by numerical simulation. concisely discuss the cause of the creation of evanescence and the problem of lateral amplitude discontinuity result from it. fourthly, use the reflectivity model, computed to describe the fracture model, with the formula of computation reflectivity based on elastic - acoustic approximation, and the wavelet model computed by the method, wavelet creation with fourier transform, we proposed, in conjunction with vrselrf wavefield extrapolation operator
第三，將頻率波數域穩定的變參考慢度rytov近似廣義屏波場延拓運算元（ vrselrf ）應用於疊前與疊后正演模擬、疊前與疊后深度偏移，對演算法應用中應注意的問題、適用范圍、性能等作了較為全面的論述；提出了基於vrselrf的單程聲波方程共炮記錄正演模擬和深度偏移快速演算法，並通過數值模擬試驗對演算法進行了驗證；簡要地討論了倏逝波的產生原因及其帶來的橫向振幅不連續性問題。The system can generate three - phase spwm pulses and has following characters : the range of modulation frequency is from 0 khz to 4 khz. and can be divided to 7 classes to control. the carrier frequency may be selected up to 24 khz, and can be divided to 8 classes to control ; rotational frequency is defined to 16 bits
該系統能產生三相六路正弦脈寬調制（ spwm ）波形;調制頻率范圍為0 4khz ，分7級控制; 16位的速度控制解析度;載波頻率分8級控制，最高可達24khz ;系統介面兼容intel系列和motorola系列單片機;該系統控制簡單、精確，易修改，可現場編程;同時具有脈沖延時小、最小脈沖刪除、過壓和過流保護功能等特點，可應用於pwm變頻調速系統的全數字化控制。The innovative ideas in this paper are that robust h control theory based on conventional ip controller is applied to the high - precision feed of a single axis, and the controlled plant is composed of ip velocity loop and two - order model of linear motor. a constraint condition on y in the problem of h2 / h is deduced from the frequency criterion of riccati equation, which makes the repeated computation on r simple. considering the two - loops control problem, the h state feedback controller based on ip controller as the inner controller is applied to satisfy the velocity performance of the system, and a pi controller, the external controller, is used to satisfy the position performance
本文的創新之處在於將傳統的ip速度控制器和直線電動機的二階模型作為一個廣義的被控對象，利用魯棒h _控制理論設計了一個h _狀態反饋控制器，以此解決高精度進給的控制問題，並在此基礎上研究了h _ 2 h _混合控制問題，結合h _代數riccati方程正定鎮定解存在的頻率判據，推出了一個控制器存在的約束條件，使以往須反復試探的，有了更進一步的約束范圍，簡化了計算。3. based on the dynamic response of all damage cases, it discusses the indexes including frequencies, modal curvatures and their compounded index used in rbf networks. it is found that the method can identify the location and severity of the damage accurately and effectively and the compounded index is better than others
3 .根據簡支工字鋼梁各損傷工況下的動力特性，分別研究了將頻率變化率、模態曲率變化及其組合參數作為徑向基網路的輸入指標時進行結構損傷識別的效果，發現基於徑向基網路的梁式結構損傷識別方法能夠正確識別損傷，且組合參數作為輸入指標時的識別效果更好。Multiple - input multiple - output ( mimo ) technique, offers an effective way to combat and even exploit fading. another technique, orthogonal frequency division multiplexing ( ofdm ), proposed in 1960s, now has gained much attention with its ability to reduce system complexity
而60年代提出的正交頻分復用（ ofdm ）技術，由於能夠顯著簡化系統接收機的設計並具有優越的頻譜效率，近十多年來也獲得了極大的關注。Its being used can form high efficiency insulated switching power supply without using utility power transformer. the switching power ic is selected firstly in the design of high power switching power supply, precision switching power supply, application specific switching power supply and so on in the world, which has been making switching power supply short, small, light and thin the control techniques of dc - dc switching converters are completely described and analyzed
單片開關電源管理集成電路具有高集成度、高性價比、簡單外圍電路、優越性能指標等優點，能構成高效率無工頻變壓器的隔離式開關電源，目前已成為國際上開發中、小功率開關電源、精密開關電源、專用開關電源以及開關電源模塊的優選集成電路，使得開關電源正朝著短、小、輕、薄的方向發展。The prototype test results indicate : voltage mode and current mode ac - ac mode ac / ac converters with high frequency link have the advantages such as high frequency electrical isolation. simple topology, two - stage power conversions, high power density, bidirectional power flow, good line current waveform, no audio noise, high converting efficiency, and high input power factor etc. this kind of converter lay the key technical foundation on new type regulated sinusoidal ac power supply, electronic transformer, ac regulator, and wave converter etc
試驗表明，這類變換器具有高頻電氣隔離、電路拓撲簡潔、兩級功率變換（ lfac hfac lfac ） 、功率密度高、雙向功率流、無音頻噪音、變換效率高、網側功率因數高等優點。為新一代正弦交流穩壓器、電子變壓器、交流調壓器、同頻波形變換器的實現奠定了關鍵技術基礎。Ofdm, with the advantage of high spectrum efficiency and easy realization, can strongly combat multi - path and dispersive channel interference, so its application is remarkable in recent years
正交頻分復用（ ofdm ）技術具有抗多徑時延、抗通道衰落、頻譜利用率高、硬體實現簡單等優點，近年來受到廣泛關注。Presents the simple but highly reliable on - line detection of ultrasonic transducer clamping capacitance based on the impedance circuit model constructed through the impedance characteristics of the ultrasonic transducer under triple harmonics, and concludes from experimental results that this method can be used to effectively detect the variation of clamping capacitance while the transducer is operating, and the matching inductance can be dynamically regulated according to the results of detection, and dynamic matching can therefore be achieved in the real sense at the end of the transducer to improve the overall performance of the whole system
為了解決大功率超聲應用的換能器電端匹配問題，分析了超聲波換能器在諧振頻率三次諧波下的阻抗特性，給出了超聲換能器三次諧波下的阻抗電路模型.並根據阻抗電路模型建立了對超聲換能器的夾持電容實現在線檢測簡單、可靠性高的方法，實驗證明該方法有效的.該方法可以在換能器工作過程中隨時檢測夾持電容的變化，根據檢測結果對匹配電感進行動態調整，實現真正意義上的換能器電端的動態匹配，從而大大改善匹配質量，提高系統的工作性能The main features and applications of the fmcw radar in the radar altimeters, automotive highway monitoring systems, warship navigation systems and other areas are reviewed first
首先回顧了fmcw雷達的特點和應用以及單一正弦信號頻率估計的各種方法，簡單分析了線性fmcw雷達的測距基本原理。The thesis mainly deals with the third part of across : " sompi " cepstrum methods. the principle and system structure of across a re first introduced. the propagation of wave in media is simply studied and its transfer function in frequency domain is modeled as superimposed damped exponential sinusoids, each damped exponential sinusoid is called as a wave element and its exponential index part consists of two factors : group velocity travel time and decayed factor
為此，首先介紹了across的原理與組成和通過簡單地討論地震波在介質中的傳播情況建立起介質的傳遞函數模型，指出：在一個狹窄的頻率窗口裡，介質的傳遞函數可以用有限個阻尼正弦項的疊加的形式表示，每個阻尼正弦項代表一個波成分，其指數部分包括兩個因子：波成分在介質中的傳播時間和衰減因子。分享友人