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| R2011b Documentation → Simulink Control Design | |
Learn more about Simulink Control Design |
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| Contents | Index |
This table summarizes what's new in Version 3.2 (R2010b):
| New Features and Changes | Version Compatibility Considerations | Fixed Bugs and Known Problems |
|---|---|---|
| Yes Details below | No | Bug
Reports Includes fixes |
New features and changes introduced in this version are
New Blocks for Plotting and Verifying Linear System Characteristics of Simulink Models
New Tools for Identifying Time-Varying Source Blocks for Frequency Response Estimation
Tuning Tools Update Workspace Variables That Define Parameters of Tuned Blocks
New Demo Illustrating Control Design for a Plant That Has Parameter Variations
This version of Simulink® Control Design™ software provides new blocks for:
Simulink Control Design software provides six new blocks in the Linear Analysis Plots library. Use these blocks to plot the time- and frequency-domain characteristics of a linear system computed from a nonlinear Simulink model. The linear system is computed and plotted during simulation at:
Simulation snapshot times. The default snapshot time is 0.
Trigger-based simulation events.
You can also use these blocks to specify bounds on the linear system characteristics, and view the bounds on the plot.
Because these blocks are same as the Model Verification blocks except for the default settings of the bound parameters, you can optionally use the blocks to verify that the bounds are satisfied during simulation.
For more information, see:
Linear Analysis Plots block reference pages
Plotting Linear System Characteristics of a Chemical Reactor demo
Simulink Control Design software provides six new blocks in the Model Verification library. Use these blocks to verify that the time- and frequency-domain characteristics of a linear system, computed from a nonlinear Simulink model, satisfy specified bounds during simulation. For example, you can verify whether the linearized behavior of your model satisfies upper and lower magnitude bounds on a Bode plot or gain and phase margins.
You can perform the verification during simulation at:
Simulation snapshot times. The default snapshot time is 0.
Trigger-based simulation events
Because these blocks are same as the Linear Analysis Plots blocks except for the default settings of the bound parameters, you can use the blocks to view the bounds on time- and frequency-domain plots.
You can also use these blocks with the Simulink Model Verification library blocks to design complex logic for model verification.
If you have Simulink® Verification and Validation™ software, you can construct simulation tests for your model using the Verification Manager.
For more information, see:
Model Verification in the Simulink Control Design documentation.
Model Verification block reference pages
Verifying Frequency-Domain Characteristics of an Aircraft demo
When you are performing frequency response estimation, time-varying source blocks in the signal path can skew the results. Previously, to obtain accurate estimation, you manually identified source blocks and inserted open-loop points in your model to disable them.
The new frest.findSources command automatically detects time-varying source blocks in the signal path of the output linearization points in your Simulink model. Additionally, a new option to the frestimate command, BlocksToHoldConstant, allows you to disable these blocks during frequency response estimation.
For more information, see the frest.findSources and frestimateOptions reference pages.
There is also a new Model Advisor check for detecting time-varying source blocks in your model. For more information about using the Model Advisor, see Consulting the Model Advisor in the Simulink User's Guide.
When you use Simulink Control Design tools to tune a block with parameters defined as workspace variables, the software now updates the values of the workspace variables. This update occurs when you write the compensator design to your Simulink model. The block remains parametrized by the variables. The software can update variable parameters that represent numerical values or Simulink.Parameter objects, whether they reside in the base workspace or the model workspace.
Previously, tuning a block parametrized by workspace variables overwrote the block parameters with numerical values. Thus, such tuning did not change the value of the workspace variables.
This release introduces several enhancements to the PID Tuner, including:
New response plot options let you analyze system responses in either time domain (step plot) or frequency domain (Bode plot). Available responses are reference tracking, input and output disturbance rejection, controller effort, open loop, and plant.
New options when the plant linearizes to zero at the operating point defined in the Simulink model.
When the plant linearizes to zero on launch of the PID Tuner, the PID Tuner provides an option to linearize at a different operating point. The PID Tuner also lets you import an LTI model of your plant, such as a model obtained by frequency response estimation. Previously, the PID Tuner did not launch when the plant linearized to zero.
For an example illustrating these options, see the new Simulink Control Design demo, Designing PID Controller in Simulink with Estimated Frequency Response.
For more information about using the PID Tuner, see Automatic PID Tuning in the Simulink Control Design User's Guide.
The Reference Tracking of a DC Motor with Parameter Variations demo illustrates compensator design for a plant that has parameter variations. The demo shows the following techniques:
Performing batch linearization to obtain multiple linear models from a single Simulink model
Using the new SISO Design Tool ability to analyze a control design for multiple models simultaneously
 | Version 3.3 (R2011a) Simulink Control Design Software | Version 3.1 (R2010a) Simulink Control Design Software |  |
Learn more about resources for designing, testing, and implementing control systems.
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