Transport delay block numerical problem

Question

Alexandru Bitca 2019-8-30

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https://ww2.mathworks.cn/matlabcentral/answers/478257-transport-delay-block-numerical-problem

编辑： Alexandru Bitca 2019-8-30

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?

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Answer 1

Osama Khallouf 2019-8-30

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/478257-transport-delay-block-numerical-problem#answer_389781

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.