Variable step time with series of simulations in simulink - Plotting Difficulties

Hallo!

I have made an model where observ diffrent aspect of a PEMFC stack depending on load and temprature.

since each time i run the simulation the number of steps is different. Wich makes the specific Efficiency for that specific current uncompareble with the next simulation.

The only alternative i see is to run with a fixed value but that makes the simulation to take hours... All help with alternative suloutions is appriciated!

i put the code in the bottom.

Thanks in advance!

Here on left i tried to set a specific value like this:

surf(EffM)

xlabel('Current (A)','FontSize',12,'FontWeight','bold')

ylabel('Temp (C)','FontSize',12,'FontWeight','bold')

zlabel('Efficiency (%)','FontSize',12,'FontWeight','bold')

colormap(jet)

and on the right;

figure('Name','Eff LUT')

surf(CurrentM(1,:),tempA(2:Sweep+1),EffM)

xlabel('Current')

ylabel('Temp')

colormap(jet)

The hole code:

Tstart=0; % Starting time for the simulation [s]

Tstop=10;

Sweep=20;

Kelvin=273.15;

PEMTemp=301;

tempA=-50:10:150;

tempA=tempA+Kelvin;

t=length( time );

EffM=zeros(Sweep,t+40);

CurrentM=zeros(10,t+40);

VoltageM=zeros(Sweep,t+40);

H2flowM=zeros(Sweep,t+40);

ttempM=zeros(Sweep,t+40);

ttempM2=zeros(Sweep,11);

for x=1:Sweep

%for y=1:100

%Speed = SpeedA(y);

% PEMTemp44= tempA(x);

PEMTemp= tempA(x);

open_system('PEM_Dynamic_Temp_LUT')

set_param('PEM_Dynamic_Temp_LUT/Constant6', 'value', 'PEMTemp')

set_param('PEM_Dynamic_Temp_LUT', 'SimulationCommand', 'update');

sim('PEM_Dynamic_Temp_LUT',[Tstart,Tstop])

l2=length( Current );

lt=t+40-l2

tt=ones(lt,1);

CurrentM(x, :)= [Current ; tt];

VoltageM(x, :)= [Voltage ; tt];

EffM(x, :)=[Eff ; tt];

H2flowM(x, :)=[H2flow ; tt];

end

Answer 1

[Arthur Roué]

You can interpolate your results with interp1 function or a griddedInterpolant object. This way, you'll always have the same points to compare your simulations.