.Modelica_LinearSystems2.DiscreteZerosAndPoles.Analysis.timeResponse

Information

Syntax

(y, t, x)=DiscreteZerosAndPoles.Analysis.timeResponse(dzp, tSpan, responseType, x0)

Description

First, the DiscreteZerosAndPoles record is transformed into discrete state space representation which is given to DiscreteStateSpace.Analysis.timeResponse to calculate the time response of the state space system. The type of the time response is defined by the input responseType, i.e.

Impulse "Impulse response",
Step "Step response",
Ramp "Ramp response",
Initial "Initial condition response"

Starting at x(t=0)=x0 and y(t=0)=C*x0 + D*u0, the outputs y and x are calculated for each time step t=k*dt.

Example

  q=Modelica_LinearSystems2.DiscreteZerosAndPoles.q();
  Modelica_LinearSystems2.DiscreteZerosAndPoles dzp=1/(q^2 + q + 1)
  dzp.Ts=0.1;

  Real tSpan= 0.4;
  Modelica_LinearSystems2.Types.TimeResponse response=Modelica_LinearSystems2.Types.TimeResponse.Step;
  Real x0[2]={0,0};

  Real y[5,1,1];
  Real t[5];
  Real x[5,1,1]

algorithm
  (y,t,x):=Modelica_LinearSystems2.DiscreteZerosAndPoles.Analysis.timeResponse(dzp,tSpan, response,x0);
//  y[:,1,1]={0, 0, 1, 0, 0}
//         t={0, 0.1, 0.2, 0.3, 0.4}
//  x[:,1,1]={0, 0, 3.0, 0, 0}

Interface

encapsulated function timeResponse
  import Modelica;
  import Modelica_LinearSystems2;
  import Modelica_LinearSystems2.DiscreteStateSpace;
  import Modelica_LinearSystems2.DiscreteZerosAndPoles;
  import Modelica_LinearSystems2.Utilities.Types.TimeResponse;
  extends Modelica_LinearSystems2.Internal.timeResponseMask_zp_discrete;
  input Modelica_LinearSystems2.Utilities.Types.TimeResponse response = Modelica_LinearSystems2.Utilities.Types.TimeResponse.Step;
  input Real x0[DiscreteZerosAndPoles.Analysis.denominatorDegree(dzp)] = zeros(DiscreteZerosAndPoles.Analysis.denominatorDegree(dzp)) "Initial state vector";
end timeResponse;