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wrong Numerical calculation in ABAQUS
Tue, 2011-09-13 09:28 - mrrahimi
Hey Guys,
I have a problem on integrating process in ABAQUS.
in a very simple problem, I applied time history of acceleration as a boundary condition and got displacement of that boundray. Then I applied that time history displacement on the same boundray to reach same acceleration. But they were different.
Anybody knows what's the problem and how I can solve that?
Thanks all in adavance,
Reza
PhD candidate,
Civil Engineering Department
The university of Akron
Forums:
Can you be more specifici
Can you be more specifici on the size of the difference?
Since Abaqus uses numerical intergration, there will almost always be a numerical error when calculating the displacement from a acceleration, or the other way around. Depending on your timestep this error can become larger.
A simple example of numerical integration can be found on wiki
http://en.wikipedia.org/wiki/Numerical_integration
Does this answer your question?