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unit-step
相关语句
  单位阶跃
     Application of Unit-Step Functions in Calculating Beam Influence Lines
     单位阶跃函数在梁影响线计算中应用
短句来源
     Application of Unit-step Function in Beam Bending Theory
     单位阶跃函数在梁弯曲理论中的应用
短句来源
     Based on the analysis of nonlinear dynamics to time series of strain and stress which are tested by MTS to lots of joint systems of sandstone specimens,a new rule to find the largest Lyapunov exponent is established by introducing LE1-m mathematical model and unit-step function.
     基于对大量砂岩试样裂隙系统的MTS全应力–应变时间序列的非线性动力学分析,构造单位阶跃函数并引入到最大Lyapunov指数LE1的判别模型中,建立了确定LE1的新准则。
短句来源
     The non-parametric models of the unit-step response and frequency response and the dynamic performance index of both in time domain and in frequency domain are also given in this paper.
     文中还给出了单位阶跃响应和频率响应两种非参数模型,以及时间域和频率域的动态性能指标。
短句来源
     The uses of the Unit-step function in material mechanics
     单位阶跃函数在材料力学中的应用
短句来源
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  “unit-step”译为未确定词的双语例句
     A Method for Optimizing Digital PID Parameters on the Basis of Object Unit-step Response Curve
     根据对象阶跃响应曲线优化数字PID参数的方法
短句来源
     Unit-step Response Curves Computed with Dynamic Characteristic Test Curves
     由超临界锅炉动态试验曲线计算单位阶跃响应曲线
短句来源
     Dislocation distribution function of the edges of an axially symmetric crack subjected to unit-step loads
     轴对称裂纹表面受阶跃载荷的位错分布函数
短句来源
     It is more reasonable that the dynamic performance index both in frequency domain and in time domain should be calculated from model calculated frequency response and unit-step response.
     由参数模型计算的阶跃响应与频率特性上计算时域与频域的动态性能指标才比较合理。
短句来源
     This paper presents a method for optimizing the digital PID parameters on the basis of object unit-step response curve.
     本文介绍了根据对象阶跃响应曲线进行数字PID调节器参数最优整定的方法。
短句来源
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  相似匹配句对
     Stroke Unit
     卒中单元
短句来源
     On the Unit of Translation
     翻译单位论
短句来源
     On T-unit analysis
     关于T单位测量标准
短句来源
     On unit-regular rings.
     单位正则环
短句来源
     Step into Russia
     走进俄罗斯
短句来源
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  unit-step
It is well known that the relaxation modulus of a linear-isotropic-viscoelastic material under uniaxial load is the stress history of a unit-step strain history.
      
The response of a two-dimensional system of a certain class to an input of the unit-step type
      
An experimentally obtained transient response of the acoustic anemometer along with a theoretical expression of the response in an approximation of the unit-step function by an inertial unit are presented.
      
In such cases, an additional performance criterion, such as the integral of squared error of impulse response or unit-step response, has to be used to select a suitable Routh approximant.
      
The problems researched can be facilely transformed into Riemann-Hilbert problems and analytical solution to an asymmetrical propagation crack under the condition of point loads and unit-step loads, respectively, is acquired.
      


The step-line-method of determining frequency response from transient response had been established in Ref.[1], which may only be used for tran sient response to either positive or negative unit step function and unit impulse function. Besides this, the paper has establised more general step-line-method of determining frequency response from transient response which may be used for more general input signals, e.g.half sine waves, triangular waves, square waves, etc.The advantages of this method in comparing...

The step-line-method of determining frequency response from transient response had been established in Ref.[1], which may only be used for tran sient response to either positive or negative unit step function and unit impulse function. Besides this, the paper has establised more general step-line-method of determining frequency response from transient response which may be used for more general input signals, e.g.half sine waves, triangular waves, square waves, etc.The advantages of this method in comparing with the Bowersox's and Carlson's methods[2] [3][4]are wider scope of application and simplier mathematical operations.

[1]中建立的阶梯线法适用于由阶跃过渡过程、回零过渡过程、脉冲过渡过程求频率特性.本文将阶梯线法推广到能适用于除上述三种过渡过程之外的其余各种输入作用(如半正弦波、三角波、上升前沿不陡的“阶跃”信号等)下的过渡过程求频率特性。这种方法比[2][3][4]中采用的Bowersox和Carlson的方法具有适用范围广、简单等优点。

This paper investigates how to apply the FFT to the analysis of the unit step response of an automatic control system correcttly. For the FFT of the unit step function u(t), as the sampling range T is bounded, the frequency spectrum leakage effect leads to that u(jω_n), the value of the frequency spectrum u(jω) at the Point ω_n=(2nπ)/T which is in the frequency domain, equals to zero. Samp ling the continuous frequency spectrum u(jω) of u(t), multiplying the sampled-data by the transfer function of the system...

This paper investigates how to apply the FFT to the analysis of the unit step response of an automatic control system correcttly. For the FFT of the unit step function u(t), as the sampling range T is bounded, the frequency spectrum leakage effect leads to that u(jω_n), the value of the frequency spectrum u(jω) at the Point ω_n=(2nπ)/T which is in the frequency domain, equals to zero. Samp ling the continuous frequency spectrum u(jω) of u(t), multiplying the sampled-data by the transfer function of the system correlatively and takin the inverse FFT of the product, we obtain the response C(kΔt) of the system. The sampling period Δt is inversely proportional to the bandwidth of the response of the system. In this paper, the bandwidth is depended on the parameters of the system and the given transient time. Then Δt is decided by the bandwidth. The error caused by the frequency spectrum aliasing effect is limited to the given accuracy range.

本文从理论上研究了自控系统对单位阶跃的响应时正确使用FFT的途径和方法.对单位阶跃U(t)进行FFT时,由于取样范围T有限,频谱渗漏效应使得频率域的点ω_n=2nπ/T的频谱U(jω_n)=0.对U(t)的连续频谱U(jω)进行离散采样,将其和系统的传递函数对应相乘,再对积进行逆FFT,就求出系统的响应C(K△t),等距值△t和系统响应的带宽互为倒数关系,根据系统参数和给定的过渡过程时间指标确定带宽,由它确定△t值,把频谱混迭效应形成的误差限制在给定的精度之内.

The third-order control system discussed in this paper is composed of PI controller and non-self-equilibrating controlled object of inertia unit in series with integral unit. There are many kinds of adjustment principle for choosing its parameters. With regards to the problem of the optimum regulating process, this article investigates the relation between dynamic performance index and system angular speed ω in light of the dynamic performance curve which shows the response to the unit step signal and unit ramp...

The third-order control system discussed in this paper is composed of PI controller and non-self-equilibrating controlled object of inertia unit in series with integral unit. There are many kinds of adjustment principle for choosing its parameters. With regards to the problem of the optimum regulating process, this article investigates the relation between dynamic performance index and system angular speed ω in light of the dynamic performance curve which shows the response to the unit step signal and unit ramp signal. Then, in accordance to better performance index and the possible local industrial craftsmanship and qualification of regulation organism that might be realized, system angular speed ia value is selected, followed by the choosing of parameters of the controller to get the optimal regulating process.

本文从三阶自动调节系统基本形式对单位阶跃、单位斜坡信号所具有的动态反应曲线出发,研究过渡过程的动态性能指标与系统角频率ω之间的关系,然后根据动态性能指标,实际工艺过程及调节机构可能实施情况,合理选择系统的角频率ω,从而确定调节器的整定参数,以达到最佳调节过渡过程之目的。

 
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