Learning Forum

[danilo98]

Hi guys, I´m trying to perform a simulation of vibrations, so, I have made a transient structural in which I put my acceleration and the gravity acceleration, but I have a problem. The first part of the simulation I have stresses that have an oscilation ( As I supposed) but after a little amount of time they are drastically reduced. ANd the otherproblem is that even the highest values of stress are too low, they are less than the stress in static structural with only the gravity acceleration. Why may occur? I even tried doing the simulation with only the gravity acceleration and the stress has a very strange behavior and is less that the one in static structural. Thanks for the help.

 

[peteroznewman]

Please attach the Archive .wbpz file to your post so I can take a closer look.  File size is limited to 120 MB, so Clear Generated Data on the Mesh to make the file size smaller.

[danilo98]

Ok, please give me a few minutes and I´ll post it. Thank you

[peteroznewman]

The website is a bit broken today, you might not be able to Attach.  If you have a Google Drive or Onedrive, you can reply with that link.

[danilo98]

Here is the file, thanks.

https://drive.google.com/drive/folders/1ZZshnVneXid9fkKwSi-AEgIXLeg7G-f4?usp=sharing

[peteroznewman]

In order to solve it under the Student license limits, I suppressed one tower of apples and the large plate below.

The Static Structural Gravity result is on the left and the maximum stress over the 2 second Transient is on the right.

The stress during the transient is lower because gravity has an acceleration of 9.8 m/s^2 while the acceleration graph for the Transient is shown below.
The magnitude of the transient acceleration is only about +/- 0.5 m/s^2 so it is not surprising that the stress is lower.