MATLAB Answers


How can i run different timelines in Simuink?

Asked by Siavash
on 9 Jun 2014
Latest activity Edited by Rashmil Dahanayake on 9 Jun 2014
Hi Guys. I have modeled a fate and transport system of contaminants in subsurface media with Simulink. This model consists of Subsystem 1 and Subsystem 2. The Problem is when I run the model, both Sub1 and Sub 2 run together but I want that the clock in Sub 2 starts with a delay respect to Sub1. In other words I want Sub 2 starts when sub 1 hit a specific time. I would be grateful if you help me through this.


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3 Answers

Answer by Rashmil Dahanayake on 9 Jun 2014
Edited by Rashmil Dahanayake on 9 Jun 2014
 Accepted Answer

Use "Enabled subsytem" block for both Subsytems.
Updated file attached. Sub system 1 tuns from 0-75s. Subsystem 2 runs from 75-100s taking the value from subsystem1 when t=75s. You can edit the trigger point as required.


Thanks a lot but I can not download the file. Would you mind send it to my email or attach it again?
By the way my email is
Oh by the way the second compartment would start at t=75. Can I do anything that the 75s in subsystem 1 becomes 0 s in subsystem 2??
Subsystem1 starts at t=0, subsystem2 starts at t=75
For display purpose you can time shift the t-axis using an x-y plot instead of the scope.

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Answer by Chandrasekhar on 9 Jun 2014

hi. you need to develop a scheduler where in the subsystem2 gets triggered based on subsystem1

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As a matter of fact everything would be just fine if I can transport my signal backward. I can not transport backward just forward as long as Transport block does not accept any negative value. Do you have any answer for me? I would be very grateful for your help.

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Answer by Rashmil Dahanayake on 9 Jun 2014

Use an embedded matlab function to create a rule to overwrite negative time values. Attach the mdl file to investigate further


Here is my model. I need to eliminate all the zero elements before the "Travel time trough unsaturated zone" and shift my signal from "t=Tunsat" to 0. Would you mind help me?
I need to shift the signal to zero and then proceed it to the next subsystem. I don't want them to run simultaneously.

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