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errors of phase
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  相位误差
     The analysis showed that the errors of amplitude mainly depend on aperture angle θ, the other parameters such as frequency f,velocity υand normal distance z only have limited influence on errors of phase.
     分析表明,振幅误差主要取决于孔径角θ,其他参数如频率f、速度υ、法线距离z等只是有限地影响相位误差
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     This paper introduces the basic idea of applying DSP in the measuring of electric power parameters. The method is given to compensate errors of active power and reactive power caused by errors of phase.
     提出了利用DSP技术测量电力参数的基本思想,对相位误差引起的电力参数中的有功功率和无功功率误差进行了补偿。
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  “errors of phase”译为未确定词的双语例句
     The results show that the errors of phase and magnitude are around 0.5~1.5 degrees and 0.5%~2% in real power system respectively.
     计算表明 ,同步相量幅度相对误差为 0 .5 %~ 2 % ,角度误差为0 .5°~ 1.5°。
短句来源
     A Microprocessor Controled Phase Comparer Using Method of Inverting Phase to Eliminate Non Linear Errors of Phase Detector
     采用倒相方法克服比相器非线性的微机化比相仪
短句来源
     The usual adaptive filter can not be directly used in an active noise control system because there is an acoustic channel between the loudspeaker and the error microphone, and this acoustic channel will enable the system unstable. Based on the phase characteristic of the acoustic channel, we propose a method such that the transmission characteristic of the acoustic channel can be identified experimently. In room test, the errors of phase factor of a single channel are studied.
     传统的自适应滤波器不能直接用于主动噪声控制(ANC),因为扬声器和误差传声器之间的声学通道可能使系统不稳定.本文根据声学通道的相位特性,建立补偿滤波器,提出了用实验方法辨识声学通道传输特性.在房间实验中研究了单通道相位因子的变化特性,并进一步用于飞机舱内多通道主动噪声控制,给出了相应的实验结果.
短句来源
     This paper analyses the reasons causing non linear error when the phase difference is close to 0° or 360°, and proposes a method of inverting phase to eliminate the non linear errors of phase detector. It is proved that the measurement accuracy of the phase detector at higher comparing frequency has been improved.
     本文分析了线性比相器在0°(360°)附近比相时产生非线性误差的原因,提出了采用倒相方法克服比相器非线性的措施,提高了比相器在较高比相频率下的测量精度
短句来源
     Phase difference is the main reason which can lead to measuring errors in Sound Intensity Measurement. In this thesis,the main reason which lead to phase difference can be found by calculation and analysis,and update methods with errors of phase difference of system can be posed in the measurement way of FFT.
     在声强测量技术中,相位失配是引起测量误差的主要因素,通过计算和分析,找出引起相位失配的原因.并提出了在FFT测量中,对系统相位失配误差进行校正的方法
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  errors of phase
A system for balancing out the systematic errors of phase-measuring instruments
      
For that, the errors of phase angle and amplitude of the measuring transformers must be known.
      
The determination of the errors of phase angle and amplitude of measuring transformers is carried out on the basis of calibrated standard measuring transformers which are traceable to national standard equipment at rated frequency, e.g.
      
For the load loss measurement of power transformers, current and voltage transformers with usually extremely low errors of phase angle and amplitude are used.
      


This paper gives a simplified method which can be used to reduce the order of high-order system. This method is based on following: if the reduced frequency-response characteristics are compared with those which are not reduced, the error of logarithmic magnitude characteristics is lessthan 1 dB, and the error of phase-angle characteristics is less than 5 degree.Within certain range of frequency, then, this reduction is a success. Thus, the reduced system doesn't change the stability of the original...

This paper gives a simplified method which can be used to reduce the order of high-order system. This method is based on following: if the reduced frequency-response characteristics are compared with those which are not reduced, the error of logarithmic magnitude characteristics is lessthan 1 dB, and the error of phase-angle characteristics is less than 5 degree.Within certain range of frequency, then, this reduction is a success. Thus, the reduced system doesn't change the stability of the original system.This paper develops detailed calculations for the reduction of some ordinary links and systems, and proves the rationality of this reduction separately from complex frequency-domain and time-domain. We think this"5 °- ldB" method which is introduced in this paper is worth using.

本文给出了一种降低高阶系统阶次的简化方法.该法的出发点是:如果系统简化后的频率特性与简化前相比,在某一频率范围内,幅频特性误差不大于1dβ,相频特性误差不大于0°,则认为这种简化是成立的,即简化后的系统不改变原系统的稳定性.本文对电力拖动系统中常见的环节和系统的简化做了详细的计算.我们认为,在电力拖动系统的设计中:本文介绍的方法是有实用价值的.

In this paper, the effect of Legendre expansion of scattering phase function with a finite number of terms on solving radiative transfer equation is studied and an improved algorithm suggested.Both theoretical analysis and numerical experiments have shown that the multiple-scattering component of radiance and radiative flux are not much more sensitive to the expansion error of phase function than the single-scattering component, and through correcting the single-scattering component by the exact...

In this paper, the effect of Legendre expansion of scattering phase function with a finite number of terms on solving radiative transfer equation is studied and an improved algorithm suggested.Both theoretical analysis and numerical experiments have shown that the multiple-scattering component of radiance and radiative flux are not much more sensitive to the expansion error of phase function than the single-scattering component, and through correcting the single-scattering component by the exact phase function, an accurate radiance solution can be obtained under Legendre expansion of phase function with less terms, thus the computing time can be down by a factor of about 5 for the optical depth less than unity.

本文研究了散射相函数的有限项的勒让德展开对于求解辐射传输方程的误差效应,提出了一个改进算法.理论分析和数值试验的结果都表明,多次散射分量和辐射通量远比一次散射分量对相函数的展开误差不敏感.只要用正确的相函数修正一次散射分量、就能在较少项的相函数勒让德展开下得到精确的辐射强度解,从而大大提高了计算速度,对于小于1的光学厚度,计算时间可减少五分之四.

A discussion is made on the relationship between the random error of the time and phase measurements and the signal-to-noise ratio when range and phase are determined by an acoustic transponder. The rms error of time measurements is given and the rms error of phase-descri-minating signal. in a homogenuous limited band white noise field is slso provided.

本文讨论了在声学应答测距和相位测量中,时间和相位测量的随机误差与信噪比之间的关系,给出了时间测量的均方根误差:σ_t=2/(πB)[(A~2)/N]~(-1/2),以及在各向同性的限带白噪声场中鉴相信号的均方根误差为:σ_(?)=[(BNo)/(A~2)]~(1/2)。

 
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