How to use this code in simulink without using For loop?

v0 = 89 / 60;                                            % [m/s] velocity of preheating roller 4
v1 = 89.2 / 60;                                          % [m/s] velocity of drawing roller 1
L = 0.7193;                                              % [m] length between preheating roller 4 and drawing roller 1
t_end = 10;                                             % [s] final time value of simulation
s0 = 0.0003537;                                          % previous strain from preheating rollers
Dt = 0.001;                                              % [s] step size in time
i_t = [0 : Dt : t_end]';                                 % [s] timeperiod required for simulation
Q_out = zeros(size(i_t));                                % vector representation of amount of materials coming out
Q_in = Q_out;                                            % vector representation of amount of materials going in
s1 = Q_out;                                              % vector representation of strain from drawing roller 1
s1(1) = s0;                                              % assigning strain 1 (strain from drawing roller 1) for 1st calculation as strain 0 (strain from preheating roller 4)
for k = 1:numel(i_t)-1
    Q_in(k) = (v0 * Dt) / (1 + s0);
    Q_out(k) = (v1 * Dt) / (1 + s1(k));
    s1(k+1) = s1(k) + ((Q_out(k) - Q_in(k)) / L);
    disp(s1(k))
end

Answer 1

[madhan ravi]

Make use of Unit Delay block to use the value from previous timestep.

[Gokulraj Nattamangalathar Raju]

I have tried it. But i dont know where and how to connect unit delay block because the strain value is also changing over time.Can you please help me out?

[madhan ravi]

Please attach what you have tried so far.

[VBBV]

@Gokulraj Nattamangalathar Raju

  Q_in(k) = (v0 * Dt) / (1 + s0);  % this line in the loop is constant block

The above line in the loop can be implemented as constant value i.e. constant block.

Then for the vector which uses the amount of material output and strain from drawing roller 1,

• use two signal blocks separately in same sequence
• use the summer block before the above two signal blocks
• use the Unit Delay block after the above two signal blocks
• connect the output from Unit Delay to the summer before the above two signal blocks to create a feedback

Note: Set the simulation interval time according to the time length specified in the unit delay block

Hope this helps

[Gokulraj Nattamangalathar Raju]

I have attached my simulink model as screenshot. I dont know how to connect dekay block. please help me out. Thank you