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This table summarizes what's new in Version 3.0 (R2008b):
| New Features and Changes | Version Compatibility Considerations | Fixed Bugs and Known Problems | Related Documentation at Web Site |
|---|---|---|---|
| Yes Details below | Yes—Details labeled as Compatibility Considerations, below. See also Summary. | Bug
Reports Includes fixes | No |
New features and changes introduced in this version are
New Simscape language extends the Simscape modeling environment by enabling you to create new components that do not exist in the Foundation library or in any of the vertical products. It is a dedicated textual physical systems modeling language with the following characteristics:
Derives from MATLAB and familiar to those who use MATLAB
Contains additional constructs specific to physical modeling and excludes constructs that have nothing to do with physical modeling
Incorporated into the Simscape modeling interface
Not focused on algorithm development
The Simscape language is intended to make modeling physical systems easy and intuitive. It lets you create new physical domains and components as textual files and then use them in Simscape block diagrams to model the desired physical effects. For more information, see the Simscape Language Guide.
It is now possible to choose any variable-step or fixed-step solver for models containing Simscape blocks. Note, however, that implicit solvers, such as ode14x, ode23t, and ode15s, are still a better choice for a typical model. In particular, for stiff systems, implicit solvers typically take many fewer timesteps than explicit solvers, such as ode45, ode113, and ode1.
By default, you will get a warning when using an explicit solver for a model containing Simscape blocks. For models that are not stiff, however, explicit solvers can be effective, often taking fewer timesteps than implicit solvers. Depending on the type of your model, you can configure your preferences to either turn off this warning (if your model is not stiff) or even change it into an error (to avoid inadvertent use of explicit solvers), by using the Simscape pane of the Configuration Parameters dialog box.
If you use an explicit solver, it requires time derivatives of the input signals. By default, needed input derivatives are provided by filtering the input through a low-pass filter. The derivative of the filtered input can then be computed by the Physical Networks simulation engine. The new Derivatives tab in the Simulink-PS Converter dialog box lets you turn off input filtering and instead provide the first derivative of input as an additional input signal to the Simulink-PS Converter block. For more information, see the Simulink-PS Converter block reference page.
Because input filtering can appreciably change the input signal and drastically affect simulation results if the time constant is too large, a warning is issued when input filtering is used. The warning indicates which Simulink-PS Converter blocks have their input signals filtered. This warning can also be turned off (or changed to an error) by changing the preferences on the Simscape pane of the Configuration Parameters dialog box.
There are now two blocks that let you model fluid compressibility in variable chambers:
Piston Chamber block lets you model fluid compressibility in a chamber created by the piston in a cylinder. It replaces the Variable Volume Chamber block, available in previous releases.
Variable Chamber block lets you model fluid compressibility in variable volume chambers of any shape. The instantaneous value of the chamber volume is provided by using a physical signal port.
The Variable Volume Chamber block, available in previous releases, has been deprecated. It has been replaced by the Piston Chamber block in other (structural) blocks and in demos shipped with the product. If you have used the Variable Volume Chamber block in your models, it will continue to work. Going forward, however, use the Piston Chamber block to model fluid compressibility in cylinder chambers.
Simscape software now supports the Simulink model referencing functionality in Normal mode. Other Simulink models can now reference Simscape models in normal (non-code-generation) execution. Simscape models continue to be able to reference Simulink models (that do not contain Simscape blocks) in normal execution. See Limitations for more details.
Version 3.0 contains multiple further enhancements to simulation algorithms, resulting in improved robustness and reliability.
 | Version 3.1 (R2009a) Simscape Software | Version 2.1 (R2008a) Simscape Software |  |
Learn more about Simulink through this collection of videos, articles, technical literature and the Getting Started with Simulink Guide.
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