Operating Points

Find model operating point from specification (trimming) or simulation time, initialize model at operating point

An operating point of a dynamic system specifies the initial states and root-level input signals of the model at a particular time. You can find operating points using command-line tools, the Steady State Manager, or when linearizing a model using the Model Linearizer. For more information about operating points, see About Operating Points and Compute Steady-State Operating Points.

Apps

Steady State Manager	Find operating points for Simulink models
Model Linearizer	Linearize Simulink models
Linearization Manager	Manage linear analysis points and block linearizations

Functions

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Create Operating Point

operpoint Create operating point for Simulink model

Find Operating Points

`findop`	Steady-state operating point from specifications (trimming) or simulation
`findopOptions`	Set options for finding operating points from specifications

Operating Point Specifications

`operspec`	Operating point specifications
`initopspec`	Initialize operating point specification values
`addoutputspec`	Add output specification to operating point specification
`getStateIndex`	Get index of a state element of an operating point specification
`getInputIndex`	Get index of an input element of an operating point specification
`getOutputIndex`	Get index of an output element of an operating point specification

Simulink Model Synchronization

`update`	Update operating point object with structural changes in model
`getinputstruct`	Obtain input values from operating point
`getstatestruct`	Obtain state values from operating point

Fast Restart

fastRestartForLinearAnalysis Fast restart for linear analysis

Blocks

Trigger-Based Operating Point Snapshot	Generate operating points at triggered events
Change Operating Points	Switch between operating points during simulation (Since R2023b)

Topics

Steady-State Operating Points

About Operating Points
An operating point of a dynamic system defines the states and root-level input signals of the model at a specific time.
Compute Steady-State Operating Points
To obtain a steady-state operating point, you can trim your model using numerical optimization techniques or simulate your model until it reaches a steady-state condition.
Handle Blocks with Internal State Representation
The operating point object used for linearization and control design does not include Simulink^® blocks with internal state representation, such as Memory and Transport Delay blocks.
View and Modify Operating Points
You can view and modify operating point values programmatically at the command line or interactively using Steady State Manager or Model Linearizer.

Find Operating Points

Compute Steady-State Operating Points from Specifications

Find a steady-state operating point that meets specifications. You can specify known values or bounds for model states, outputs, and inputs.
Import and Export Specifications and Initial Values for Operating Point Search
To configure your operating point search in Steady State Manager or Model Linearizer, you can import specifications and initial values. You can also export specifications and operating points.
Change Operating Point Search Optimization Settings
You can control the accuracy of your operating point search by using different optimization methods.
Initialize Steady-State Operating Point Search Using Simulation Snapshot
If you know the approximate time when the model reaches the neighborhood of a steady-state operating point, you can use simulation to get state values to use as the initial conditions for numerical optimization.
Find Operating Points at Simulation Snapshots
Simulate your model and find an operating point that consists of the state values and model input levels at a specified simulation snapshot time.
Compute Operating Point Snapshots at Triggered Events
You can find an operating point by simulating the model until it is at steady state and taking a simulation snapshot.
Find Steady-State Operating Points for Simscape Models

To find operating points for Simscape™ models, you can trim the models using projection-based trim optimizers, or take simulation snapshots at specified times.
- Steady-State Simulation with Projection-Based Trim Optimizer

Simulink Model Synchronization

Synchronize Simulink Model Changes with Operating Point Specifications
Modifying your Simulink model can change, add, or remove states, inputs, or outputs, which changes the operating point.
Simulate Simulink Model at Specific Operating Point
You can derive your Simulink model initial conditions from your computed operating point.

Custom Trimming

Compute Operating Points Using Custom Constraints and Objective Functions
Trim Simulink models using additional user-specified constraints and objective functions.

Batch Computation

Batch Compute Steady-State Operating Points Reusing Generated MATLAB Code
Generate code for trimming your Simulink model, and modify the script to batch trim your model.
Batch Compute Steady-State Operating Points for Parameter Variation
Vary model parameters and batch trim your model to find corresponding operating points.
Batch Compute Steady-State Operating Points for Multiple Specifications
Find operating points for multiple operating point specifications using a single model compilation.
Improve Linear Analysis Performance
This example shows how to use the fastRestartForLinearAnalysis command to speed up multiple calls to compiling functions in Simulink Control Design™ such as findop and linearize.

Code Generation

Generate MATLAB Code for Operating Point Configuration
You can generate MATLAB^® code to programmatically reproduce an operating point search result that you obtained interactively.