Simulink Control Design™ - MathWorks

Simulink Control Design Checks

Identify time-varying source blocks interfering with frequency

response estimation

Identify all time-varying source blocks in the signal path of any output linearization point

marked in the Simulink model.

Description

Frequency response estimation uses the steady-state response of a Simulink model to a

specified input signal. Time-varying source blocks in the signal path prevent the response

from reaching steady-state. In addition, when such blocks appear in the signal path, the

resulting response is not purely a response to the specified input signal. Thus, time-

varying source blocks can interfere with accurate frequency response estimation.

This check finds and reports all the time-varying source blocks which appear in the signal

path of any output linearization output points currently marked on the Simulink model.

The report:

• Includes blocks in subsystems and in referenced models that are in normal simulation
  mode


• Excludes any blocks specified as BlocksToHoldConstant in the
  frestimateOptions object you enter as the input parameter

For more information about the algorithm that identifies time-varying source blocks, see

the frest.findSources reference page.

Available with Simulink Control Design.

Input Parameters

FRESTIMATE options object to compare results against

Provide the paths of any blocks to exclude from the check. Specify the block paths as

an array of Simulink.BlockPath objects. This array is stored in the

BlocksToHoldConstant field of an option set you create with

frestimateOptions. See the frestimateOptions reference page for more

information.

18 Model Advisor Checks