MATLAB: MATALAB function in simulink

matlab function in simulinksimulink

How can I create a MATLAB function in SIMULINK, that clips angle between -90° and 90°, and convert it to radians?

Best Answer

Do you need this to be MATLAB code? If so, you can use a MATLAB Function block in the Simulink --> Ports & Subsystems Library and type your own MATLAB code in there.

If you want the Simulink block approach, you can use a Saturation block to limit the angle signal and then convert it to radians with a Gain block set to pi/180.

Best,

Sebastian

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MATLAB: How can i define sind, cosd etc. in SIMULINK

Sure you can define them. You can create MATLAB Function Blocks. Or use Gain blocks. You could probably even create Subsystems if you want them to appear to be library blocks. Or even define Level-2 S functions if you are really enthusiastic about presentation and controls.

MATLAB: How to integrate angle in matlab

If alpha_dot is going very large, you could consider filtering or smoothing out the large jumps.

You can put a saturation block in to limit your alpha_dot between lower and upper values: http://au.mathworks.com/help/simulink/slref/saturation.html

Alternatively or additionally you can insert a gain block: alpha_dot = k*lateralAcceleration/v where k is a proportional gain that you can tune such that alpha_dot is within an acceptable range.

After you integrate alpha_dot to get alpha you need to wrap it between -pi and pi or 0 and 2 pi, whatever convention you are using, using mod, e.g.

angle_wrapped = (   mod( (angle-angle_min),(angle_max-angle_min))  +angle_min);

I don't remember if Simulink already has a wrap block, but there is already a wrapToPi function in the mapping toolbox if you have that.

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