I want to cycle the signal simulink according to my application i can't use any repeat blocks.How can i do it ?

Hi...I have a specific length of signal.I don't know the length of the signal .I should repeat the signal.If youu see in the file I have already created a single cycle but sending the speed and time data in the look up table and got the single cycle .I want to repeat the cycle.

Answer 1

[Fangjun Jiang]

It is somewhat difficult to repeat a user defined signal input in Simulink. In your case though, I can think of a solution.

Since you have the single cycle data in the 1-D lookup table, your must know the time duration of your single cycle signal. Let's say the data is from time 0 to time 8.4 seconds, you can add an "Interpreted MATLAB Function" block between the Clock and the lookup table block. The function you need to specify is mod(u,8.4), you will then get an endless repeat of your single cycle signal.

[Harini pushparaj]

Thanks ..But I don't want to repeat the signal endlessly. I should generate the signal cycle each time by reset the time.for instant ,if the single is 0 to 1800sec i should reset it and repeat it again Like I should count the length of the vector and reset to zero and repeat it.This is the code i used to get a single cycle :

eval(['Speed = ' cycle_name(1:end-4) '.Data;']);
eval(['Time = ' cycle_name(1:end
Time_interp = (Time(1):Ts:Time(end))';%1 driving cycle 
Speed_interp = (interp1(Time,Speed,Time_interp))

[Fangjun Jiang]

I can't seem to understand your questions now. What do you mean "reset" and "repeat"? If you've already got your single cycle, the solution I suggested will be able to repeat it. The length of the simulation determines how many times it repeats. If you run simulation for 3600 seconds, it repeats twice.

[Harini pushparaj]

I mean once the single cycle is generated .I should reset the signal again to zero(inital) and repeat the signal again. so each time I should reset and repeat it .

[Fangjun Jiang]

That is what the suggested solution does. Please try it in the Simulink model and see which part is not achieved.

To do it in MATLAB, maybe this simple example will help.

%%single cycle speed profile
SpdCycle.Time=0:8;
SpdCycle.Spd=1:9;

%%Your simulation need
Ts=0.1;
SimulTime=0:Ts:80;

%%interpolate and repeat the single cycle
TempTime=mod(SimulTime,8);
SimulSpd=interp1(SpdCycle.Time, SpdCycle.Spd,TempTime);

% plot the desired speed profile for simulation
plot(SimulTime,SimulSpd);

[Harini pushparaj]

In the code you have mention the length of the vector as 80 know .Here the problem is I should also calculate the length of the vector because the single generated is according to the data collected in time.So I should measure the length of the signal ,see where it ends and reset it again to zero and repeat the same.

[Harini pushparaj]

I did it.Thanks a lot!!!!!