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时域和频域分析

系统响应,如波特图和阶跃响应;系统特性,如响应时间和超调;仿真

您可以使用时域和频域分析命令计算和可视化 SISO 和 MIMO 系统响应,如波特图、尼柯尔斯图、阶跃响应和冲激响应。您还可以提取系统特性,如上升时间和稳定时间、超调和稳定裕度。大多数线性分析命令都可以返回响应数据或生成响应图。要开始使用绘制命令,请参阅Plotting System Responses。要创建其属性可在命令行中自定义的绘图,请参阅绘制自定义

App

线性系统分析器Analyze time and frequency responses of linear time-invariant (LTI) systems

函数

全部展开

stepStep response plot of dynamic system; step response data
stepinfoRise time, settling time, and other step-response characteristics
impulseImpulse response plot of dynamic system; impulse response data
initialSystem response to initial states of state-space model
lsimPlot simulated time response of dynamic system to arbitrary inputs; simulated response data
lsiminfoCompute linear response characteristics
gensigCreate periodic signals for simulating system response with lsim
covarOutput and state covariance of system driven by white noise
RespConfigOptions for step or impulse responses
bodeBode plot of frequency response, or magnitude and phase data
bodemag Magnitude-only Bode plot of frequency response
nyquistNyquist plot of frequency response
nicholsNichols chart of frequency response
ngridSuperimpose Nichols chart on Nichols plot
sigmaSingular value plot of dynamic system
freqrespEvaluate system response over a grid of frequencies
evalfrEvaluate system response at specific frequency
dcgainLow-frequency (DC) gain of LTI system
bandwidthFrequency response bandwidth
getPeakGainPeak gain of dynamic system frequency response
getGainCrossoverCrossover frequencies for specified gain
fnormPointwise peak gain of FRD model
normNorm of linear model
db2magConvert decibels (dB) to magnitude
mag2dbConvert magnitude to decibels (dB)

实时编辑器任务

创建绘图Interactively create linear analysis response plots in the Live Editor

模块

LTI SystemUse linear time invariant system model object in Simulink
LPV System对线性参数变化 (LPV) 系统进行仿真

主题

分析图基础知识

时域分析

频域分析

线性系统分析器

具有时滞的系统

  • Analysis of Systems with Time Delays
    The time and frequency responses of delay systems can have features that can look odd to those only familiar with delay-free LTI analysis.
  • Analyzing Control Systems with Delays
    Many processes involve dead times, also referred to as transport delays or time lags. Controlling such processes is challenging because delays cause phase shifts that limit the control bandwidth and affect closed-loop stability.

应用