MATLAB: Simulink – Rate Transition

rate transitionssimulink

Hi,

I want to use Rate Transitions in my Simulink System. I am using a Fixed-Step + Discrete Solver with a discrete step-size. If I want to implement different tasks, for example, Task 1 with a sample time of 10 ms and Task 2 with a sample time of 1 ms. Does the fixed-step size in the Configuration Parameters has to be the smallest sample time, i.e. 1 ms or is it also possible to run the whole system with 10 ms and just a few calculations with the fast sample time of 1 ms?

Thank you

Best Answer

I think you should set your solver step size to 1ms. Simulink will determine that the blocks in Task1 have to be run only every 10ms and invoke them accordingly.

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Your solver should be fixed size, and the fixed step size can be set at simulation->Configuration Parameters-> Fixed-step size (fundamental sample time)

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The ability to model a system to read the continuous variable value at every specific time-step and ignore other values is available in Simulink 7.3 (R2009a).

In the attached example, the 'Rate Transition' block is used in the model to exhibit this behavior by setting the 'Output port sample time' parameter to the required time-step value.

For more information on the 'Rate Transition' block, refer to the documentation link below.

 <http://www.mathworks.com/access/helpdesk/help/toolbox/simulink/index.html?/access/helpdesk/help/toolbox/simulink/slref/ratetransition.html>

Best Answer

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