Impulse Response Analysis

Purpose

Perform impulse response analysis

Library

PLECS Extras / Analysis Tools

Description

../../_images/impulseresponseanalysis.png

The Impulse Response Analysis block enables you to determine the transfer function of a generic system from a single input to one or more outputs. The analysis is performed by injecting a small rectangular pulse into the system and computing the inverse Laplace transform of the system response(s). The perturbation signal is available at the block output. The system outputs to be analyzed must be fed into the block’s input port.

An analysis can be started either by clicking the button Start analysis or with the MATLAB command:

plimpulseresponse(block);

where block is the Simulink handle or the full block path of the Impulse Response Analysis block. The block handle or path can be followed by parameter/value pairs that override the settings in the dialog box.

For additional information see section Impulse Response Analysis

Parameters

System period length: The period length of the unperturbed system, in seconds \((\mathrm{s})\).
Simulation start time: The simulation start time for the impulse response analysis, in seconds \((\mathrm{s})\).
Frequency sweep range: A vector containing the lowest and highest perturbation frequency.
Frequency sweep scale: Specifies whether the sweep frequencies should be distributed on a linear or logarithmic scale.
Number of points: The number of data points generated.
Perturbation: The amplitude of the perturbation signal.
Compensation for discrete pulse: Specifies whether and how the effect of the sampling should be compensated. See Impulse Response Analysis for a short explanation and example.
Termination tolerance: The relative error bound used in the initial steady-state analysis.
Max number of iterations: The maximum number of iterations allowed during the initial steady-state analysis.
Output variable: The name of a MATLAB variable used to store the transfer function at the end of an analysis. If the analysis was run interactively from the GUI, the variable is assigned in the MATLAB base workspace. If the analysis was run with the plimpulseresponse command, the variable is assigned in the caller’s workspace.
Plot bode diagram: Specifies whether to plot the transfer function in a bode diagram.
Display level: Specifies the level of detail of the diagnostic messages displayed in the command window (iteration, final, off).
Hidden model states: Specifies how to handle Simulink blocks with ‘hidden’ states, i.e. states that are not stored in the state vector (error, warning, none).