Transport delay block numerical problem

I have a Simulink model which contains a Transport Delay block that is being fed with a constant value when it causes the following issue:

While running, the Transport Delay block introduces an xe-16 difference between the input and output signals.

This difference is then captured by a downstream Relational Operator block which compares the input and output of the Transport Delay block.

Any ideas why this might happen?

Answer 1

[Osama Khallouf]

I ran into a similar problem a while ago and could not figure out the reason behind. Nevertheless, I tried this and it worked.

I am assuming that the Relational Operator compares the signal you are displaying (out - in) with zero. Change that into comparing the absolute value of (out - in) to a specified value of error (1e-15 for example), so it will behave as there is no difference between the 2 signals as long as the absolute difference is less than that specified value.

Hope you find this helpful.

[Alexandru Bitca]

The Relational Operator block compares the input and the output of the Transport Delay block.