How to plot a transfer function with variable input?

Consider the dynamics described below for the temperature measuring instrument. Get the

(y (t)) as a function of time, if the input (x (t)) varies subsequently, following the

following pattern: 30 Celsius → 35 Celsius → 45 Celsius → 30 Celsius. Note that subsequent entry only occurs after the instrument has presented its final indication.

Ft = 0,754 /(4s + 1)

I really need help.

[Walter Roberson]

Is it correct that on subsequent time steps, the input x is

30, 35, 45, 30, 30, 35, 45, 30, 30, 35, 45, 30, ...

? Or is it

30, 35, 45, 30, 35, 45, 30, 35, 45, 30, ...

?

Are we given delta t ?

[Emílio Heringer]

30, 35, 45, 30, 35, 45, 30, 35, 45, 30, ...

Answer 1

[Star Strider]

I am not certain exactly what you are asking, or what your system is doing. You need to use the tf (link) function to produce a system object from your transfer function, and the lsim (link) function to do the simulation.

EDIT — (31 Mar 2019 at 02:46)

s = tf('s');
Ft = 0.754 / (4*s + 1);
u = repmat([30, 35, 45], 1, 10);
t = 0:numel(u)-1;

y = lsim(Ft, u, t);

figure
plot(t, u, '--')
hold on
plot(t, y, '-')
hold off
xlabel('Time')
ylabel('Amplitude')
legend('u(t)', 'y(t)', 'Location','SE')

[Emílio Heringer]

thank you

[Star Strider]

My pleasure.

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