MATLAB: Brake rotor simulation – Couldn’t get results

brake rotortemperature

Hello Everyone, i'm Naveen from Texas. I have a code that simulates dynamic brake rotor temperature. I know the end result and graph. But code doesnt give me the same result. I hope its my mistake and someone can help me out.

Basically, the code simulates a car Accelerating to 60mph at 0.5G and decelerating to 30mph at 1.6G and accelerates to 60mph and repeats to 150 to 300 sec. The temperature curve has to saturate like in the picture.

I have attached the code file and the desired result file.

Best Answer

I set up maxstep

opt = odeset('MaxStep',0.1);
[t,x] = ode45(@DerFun,Tspan,x0,opt);

And now it looks like

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MATLAB: Line that moves with graph

Without your code, it is difficult to suggest an exact solution, but here is the outline of the method.

[~, idx] = min(abs(velocity-60)); % velocity is vector from your code
t_60 = t(idx); % t is time vector from your code
% then write following line after other plotting statements
yline(t_60) % vectical line at t=t_60

MATLAB: Throttle Control Issue – Matlab Code Block in Simulink

You do not tell us what u1 and u2 are.

Your current code could be condensed to

function [Throttle, CurrentThrottle] = fcn(u1,u2)
Vmin = 15*0.445;
Vmax = 30*0.445;
if(u1 < Vmin)
      Throttle = 1;
elseif(u1 > Vmax)
      Throttle = 0;
elseif u1 > u2
      Throttle = 1;
else
      Throttle = 0;
end
CurrentThrottle = Throttle;

In turn that could be condensed to

function [Throttle, CurrentThrottle] = fcn(u1,u2)
Vmin = 15*0.445;
Vmax = 30*0.445;
Throttle = u1 < Vmin | (u1 <= Vmax & u1 > u2 );
CurrentThrottle = Throttle;

It is not obvious that this is wrong: it depends on what u1 and u2 mean.

What I suspect is that in the time right after u1 stops being less than Vmin, that u1 is not greater than u2 and so the throttle switches off again before it reaches Vmax.

Best Answer

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MATLAB: Line that moves with graph

MATLAB: Throttle Control Issue – Matlab Code Block in Simulink

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