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frequency characteristic     
相关语句
  频率特性
     Application of Formula Node in the measurement of frequency characteristic
     Formula Node在频率特性测量中的应用
短句来源
     This paper analyzes frequency characteristic of power system, and points out that it is classified into static and dynamic.
     本文对电力系统的频率特性进行了分析,指出电力系统频率特性可分为静态频率特性和动态频率特性
短句来源
     The error analysis shows that the measurement error is caused by the noise of the accelerometer,discrete double integration,noise of beacon and frequency characteristic error.
     对线加速度计辅助惯性姿态角测量的误差分析表明,测量误差由加速度计噪声、二次积分离散化、信标噪声和加速度计频率特性误差组成。
短句来源
     The electric parameters of kiwifruit and pear also have the same frequency characteristic as apple and different critical voltage values, which are 1 V, 1.8 V and 1.4 V, respectively for apple, kiwifruit and pear under 10 kHz.
     猕猴桃、梨同苹果电参数的频率特性相同,而且也存在电压临界值; 10kHz下,苹果、猕猴桃和梨的电压临界值分别为0.8、1.8和1.4V。
短句来源
     Compensator of frequency characteristic of piezoelectric sensor based on CTD
     基于CTD的压电传感器频率特性补偿器
短句来源
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  频率特性曲线
     The function is introduced that after system parameter is input to computer,the open-loop amplitude phase frequency characteristic curve can rapidly be displayed and printed,the phase angle margin and gain margin are calculated simultaneously and the method of close-loop control system stability is deduced.
     介绍了利用计算机在输入系统参数后,能迅速显示和打印出开环幅相频率特性曲线,同时计算相位裕量和增益裕量及判定闭环控制系统稳定性的方法。
短句来源
     When Maltab emulation software is used in the systematic performance analysis,only simple programming is needed to draw such graphs accurately and speedily as systematic time responding curve, root orbit picture and frequency characteristic curve,etc.
     Matlab仿真软件用于系统的性能分析,只需简单编程即可准确、快捷地绘制出系统时间响应曲线、根轨迹图及频率特性曲线等图形.
短句来源
     If the substrate of smaller electromechanical coupling coefficient(such as X 112°Y-LiTaO3substrate) is used forwavelettype ofIDT,its frequency characteristic curve is smooth,butits insertionlossis larger.
     小波式叉指换能器使用机电耦合系数比较小的基片(如X 112°Y-L iTaO3基片)时,其频率特性曲线光滑,但插入损耗大.
短句来源
     e. invasive ductal carcinoma,neoplastic hyperplasia,and mastopathia. And by comparison,we find that the frequency characteristic of the diseased breast tissues is different from that of the peripheral normal tissues,and the frequency characteristic shows differences among the three kinds of diseased breast tissues.
     获得了浸润性导管癌、瘤样增生和乳腺腺病等三种乳腺疾病的电导参数的频率特性曲线,并与病变周围正常组织进行了对比,可以得出病变组织具有与正常组织不同的频率特性,而且上述三种不同种类疾病的频率特性也各有差异。
短句来源
     In this paper,the testing results indicate that the geometry parameter of sensors movable system directly affect the frequency characteristic curve,and the damp ratio increase as the average clearance of sensor decrease.
     结果表明 :传感器可动系统的几何参数直接影响频率特性曲线 ,随着传感器平均空气间隙的减小 ,可动系统的阻尼比增加
短句来源
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  频率特征
     Based on the analysis of main failure forms in diesel engines,a microcornputer system for diagnosing diesel engine failures is developed by the way as follows:Firstly picking up the vibration frequency characteristic signals from the vibration signals of cylinder head and block,then analysing the frequency spectrum with the microcomputer sytem,finally diagnosing failures with the software of a specialist system.
     在分析柴油机主要故障类型的基础上,提出从气缸盖和气缸体振动信号中提取振动频率特征信号,用微机系统进行频谱分析,用专家系统软件进行故障诊断,从而达到对柴油机故障进行诊断的目的。
短句来源
     The traditional Fourier transform theory is a pure analytical method in frequency domain and has no resolving power in time domain, so after Fourier transform the frequency characteristic of local time domain of signals cannot be obtained.
     传统的Fourier变换理论是一种纯粹的频域分析方法,在时域上不具备分辨能力,信号在经过Fourier变换后不能得到局部时域的频率特征
短句来源
     Designing Animation Interface of the Relation Between Pole-zeros and Frequency Characteristic in Digital System
     数字系统零极点与频率特征关系的动画界面设计
短句来源
     A multi-sensor data fusion method is introduced into hydroelectric units vibration fault diagnosis in this paper. By analyzing frequency characteristic,the identify frame for fusion diagnose of hydroelectric sets vibration fault is constructed,several position vibration signals of hydroelectric units are simulated,and their sub-band energy features are extracted with Wavelets and Fourier theory,then simulation diagnosis is made using data fusion method.
     该文将多传感器信息融合方法引入水电机组振动故障诊断中,通过分析机组振动的频率特征,建立了振动故障的融合诊断识别框架,并模拟机组各部位的振动信号,采用小波分析和傅立叶变换进行预处理,提取信号的子带能量特征,应用信息融合方法进行了仿真诊断。
短句来源
     From the numerical results,we studied the evolvement laws of frequency characteristics of the ground vibration signals,including the evolvement law of frequency characteristic of the blasting earthquake signals in the case when the location of the weak layers at blasting point and its distribution range and rigidness change.
     比如:爆破点和软弱结构面的相对位置以及软弱结构面分布范围和刚度改变时,爆破地震信号频率特征的演化规律。
短句来源
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  频率品质
     So a new concept of PFC ability distribution of multi-area power system was presented here,from which the influence of different PFC ability distribution on power system frequency characteristic and tie-line power transmission was analyzed with simulating method.
     在提出多区域电网一次调频能力分布概念的基础上,以各区域为研究对象,仿真分析各种一次调频能力分布对电网频率品质和联络线功率传输的影响。
短句来源

 

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      frequency characteristic
    The frequency characteristic and radiation performance of the proposed antenna are successfully optimized and the related prototypes are fabricated and tested.
          
    By using the Ritz averaging method, we deduce the equation of the amplitude-frequency characteristic of the nonlinear system.
          
    Analytic Determination of the Amplitude-Frequency Characteristic of a Nonlinear Vibroprotective System with Roller Damper
          
    We specify the formulation of the problem of reconstructing the plasma frequency height distribution from a given height-frequency characteristic (HFC) for a spherically symmetric isotropic ionosphere.
          
    Ambiguity of the Reconstruction of Plasma Frequency Profiles from a Given Height-Frequency Characteristic and Their Discernibili
          
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    This paper describes a design method of multi-stage transistor intermediate frequency wide band amplifier. The feature of design is the use of network synthesis technique for realizing the amplifier with Tschebyscheff or maximal flatness frequency characteristics. The amplifier itself consists of a cascade of RC neutralized common-emitter stages each with primary tuned interstage transformer. The discussion is divided into three parts. First, the neutralized common-emitter stage is represented by...

    This paper describes a design method of multi-stage transistor intermediate frequency wide band amplifier. The feature of design is the use of network synthesis technique for realizing the amplifier with Tschebyscheff or maximal flatness frequency characteristics. The amplifier itself consists of a cascade of RC neutralized common-emitter stages each with primary tuned interstage transformer. The discussion is divided into three parts. First, the neutralized common-emitter stage is represented by approximate unilateral equivalent circuit. Second, the interstage network is analyzed. Expressed the transistor amplifier power gain as a prescribed frequency function, it is possible to derive the limiting constraints for resonant frequencies and Q values of interstage networks, and subsequently to obtain values of circuit elements. These resonant frequencies of interstage networks are not tuned to the center frequency, but distributed at certain frequencies of the transmission band. Finally one design example is presented.

    本文叙述一种多级中频宽带晶体管放大器的设计方法,其特点是利用网络综合技术,使放大器的通频带具有契伯舍夫或最大平直型式的特陆曲线。放大器由中和了的共发射极级链接而成,级间用初级调谐的变压器耦合,叙述分三个部分:第一部分将中和了的共发射极电路用近似等效电路表示,第二部分分析级间网络,将晶体管放大器的功率增益表示成预给的频率函数后,就能导出各级间网络的谐振频率和Q值等,从而求出线路元件的数值。这些谐振频率并不是调谐到中心频率而是分布在传输频段的某些频率上的,最后举出一个数值设计实例。

    In this paper, mainly discuss the synthesis method of combined control systems (systems both contain open loop and closed loop control circuits). Suggest a simple method to calculate the system integral-square error by its logarithemic frequency characteristics. This method can easily be applied to synthesize the feedforward networks. When the output of the actuating element is subjected to some integral limit conditions, or the discrete circuit is used as feedforward unit, the synthesis method of feedforward...

    In this paper, mainly discuss the synthesis method of combined control systems (systems both contain open loop and closed loop control circuits). Suggest a simple method to calculate the system integral-square error by its logarithemic frequency characteristics. This method can easily be applied to synthesize the feedforward networks. When the output of the actuating element is subjected to some integral limit conditions, or the discrete circuit is used as feedforward unit, the synthesis method of feedforward network is also discussed.

    本文主要讨论了复合系统(具有开环及闭环控制回路的系统)的综合方法.文中拟出了一种用系统的对数频率特性计算系统误差平方积分值的简易方法,用这种方法可以很方便地综合前馈网络.对于执行环节输出有积分限制条件和用断续回路作为前馈单元的情形,文中也讨论了它们的综合方法.

    In this paper, the design of a low noise microwave transistor amplifier at 10cm-band is described. In a 3-stage amplifier with frequency coverage of ±10%, the gain over 20db and a noise figure of 2-3db are obtained. Teflon plates and alumina substrates are used for the microwave integrated circuits. By means of reactance-slope compensation method, the flatness of the gain-frequency characteristics is improved to about within Idb.

    本文叙述一种10厘米波段低噪声微波晶体管放大器的设计。已获得噪声系数2—3db。三级放大器频率复盖±l0%,增益20db以上。电路采用微波集成电路,制在双面敷铜聚四氟乙烯纤维板以及氧化铝陶瓷两种基片上。利用电抗斜率补偿的方法改善频率特性,使增益不平坦度达到约1db。

     
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