Generate linear models in base workspace when triggered
When triggered, this block calls linmod or dlinmod to create a linear model for the system at the current operating point. No trimming is performed. The linear model is stored in the base workspace as a structure, along with information about the operating point at which the snapshot was taken. Multiple snapshots are appended to form an array of structures.
The block sets the following model parameters to the indicated values:
BufferReuse = 'off'
RTWInlineParameters = 'on'
BlockReductionOpt = 'off'
The name of the structure used to save the snapshots is the name of the model appended by _Trigger_Based_Linearization, for example, vdp_Trigger_Based_Linearization. The structure has the following fields:
The A matrix of the linearization
The B matrix of the linearization
The C matrix of the linearization
The D matrix of the linearization
Names of the model's states
Names of the model's output ports
Names of the model's input ports
A structure that specifies the operating point of the linearization. The structure specifies the value of the model's states (OperPoint.x) and inputs (OperPoint.u) at the operating point time (OperPoint.t).
The sample time of the linearization for a discrete linearization
Use the Timed-Based Linearization block to generate linear models at predetermined times.
You can use state and simulation time logging to extract the model states at operating points. For example, suppose that you want to get the states of the vdp example model when the signal x1 triggers the Trigger-Based Linearization block on a rising edge.
At the end of the simulation, the following variables appear in the MATLAB® workspace: vdp_Trigger_Based_Linearization, tout, and xout.
ind1 = find(vdp_Trigger_Based_Linearization(1).OperPoint.t==tout);
x1 = xout(ind1,:);
The trigger port accepts signals of any numeric data type that Simulink® supports.
For more information, see Data Types Supported by Simulink in the Simulink documentation.
Type of event on the trigger input signal that triggers generation of a linear model. See the Trigger type parameter of the Trigger block for an explanation of the various trigger types that you can select.
Specify a sample time to create a discrete-time linearization of the model (see Discrete-Time System Linearization).