Learning Forum

[Matt Ridzon]

Folks, the image below is from the Transient Structural training notes.  In that type of analysis, if I set Time Integration = Off, what terms in the equation are altered?  I have always been told that turning off time integration makes it behave like a static analysis so I'm trying to understand the nitty-gritty behind the scenes.

[Armin]

Hi Matt,

In Transient Analysis in Ansys Mechanical, setting the parameter "Time Integration" to "Off" means that the solution step will not include transient effects like structural inertia. When "Time Integration" is set to "Off," Mechanical does not compute velocity results, as a result, the first and second terms in your equation will be equal to zero.

[Matt Ridzon]

Armin, thank you for the feedback.  I scrolled further in the training and found more information (image below).  It insinuates that the first term is not zero (i.e., only the second term is zero).  Is the training material in error?

[Armin]

Thanks Matt. I don't see any issue in the description in your picture. Since velocity is not considered using Time Integration = off, it automatically implies that acceleration (which is the derivative of velocity with respect to time) is also not considered; therefore, both inertia and damping terms will be zero.