Ramp block having reset option

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Andraz
Andraz 2024-4-15
评论： Aquatris 2024-5-8
I would like to implement in simscape a kind of ramp block having reset option, thus that ramp would start rising from zero every time the reset is triggered. I've tried with resetable subsystem block but is of no helpfull.
Have u got any idea how to solve this?

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回答（2 个）

Aquatris
Aquatris 2024-4-15
Here is one way with enabled subsystem, where the subsystem comes up with an offset (so if the ramp number gets too large it might be a problem):
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Andraz
Andraz 2024-4-24
Now I'm a bit confused. In the first scheme you drew down an enabled subsystem block while in the second one a resetable subsystem block. Which option should be the right one? If I use the latter one with the integrator in then the source signal cannot be a time ramp but a step. The integral of a time ramp is not a saw.
Aquatris
Aquatris 2024-5-8
There is no right or wrong as long as the output signal is what you expect, or unless it is a homework question asking to use a specific method.
In discrete time, there is no real ramp, it is always a step.
The ramp block does not have a reset option, so I introduced another method to generate 'resetable ramp' with an integrator.
I showed the output of the resettable subsystem as saw so why do you thinkg integral approach cannot genereate saw? The output of an integral gives a ramp, and with the reset functionality it becomes a saw

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Sam Chak
Sam Chak 2024-4-16
Ran in:
Hi @Andraz
If you have a good understanding of the fundamental mathematics behind a line graph, then theoretically, you should be able to implement the mathematical formula for a Resettable Ramp in the MATLAB Function block. This way, you can avoid using any specialized blocks that require a more abstract programmatic If–Else logic to comprehend.
t = linspace(0, 10, 1001);
p = 2*(heaviside(t - 2) + heaviside(t - 4) + heaviside(t - 6) + heaviside(t - 8));
y = (t - p)/2;
plot(t, y), grid on, ylim([-0.5, 1.5])
xlabel t, ylabel y(t), title('Resettable Ramp')

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