After getting the pin reaction from launch analysis, I would like to check barge longitudinal strength.
To check longitudinal strength, I model the tipping loads at the rocker pins location using #weight (after deleting the jacket).
But the trim result from launch analysis and during longitudinal strength (applying rocker arm reaction at pin location) is different.
Why that happen? where the rocker load should apply?
Thanks
Hi Nafuat,
The answer to your question is "dynamics". Let me expand.
The draft, roll and trim reported during the simulation includes a force that keeps the bodies moving. At each time step the forces sum to zero. At each time step there is the possibility of dynamic forces. Especially at tip there are dynamic forces.
When you find equilibrium in the hydrostatics menu only static forces are included in the calculations.
I hope this helps.
Georgina
Hi Georgina,Thanks for your reply.So how to justify the results of barge longitudinal strength? due to differences of trim the hydrostatic force distribution will different also.in other side, to maintain same trim is only by change location of rocker load reaction.
RegardsNafuat SJ
This is a dynamic load case you are examining. You should not expect a static analysis to satisfy your needs. You should follow the procedures for making a dynamic load case. For that you need to make a load case from the time domain. Then do the structural analysis in the structural analysis menu and post-process in the structural post-process menu.
There is an example of how to do a longitudinal strength analysis in via a load case, the structural analysis menu and the structural post-process menu in the long_str sample file. Please find that file in the following directory. The assumption is that you took the defaults when installing MOSES.
C:\Program Files\Bentley\Engineering\MOSES CONNECT Edition V10.14\hdesk\runs\samples\how_to
There are several sample files that show how to make a load case from a time domain analysis. The one I usually follow is pic_prc. Please find that file in the following directory.
C:\Program Files\Bentley\Engineering\MOSES CONNECT Edition V10.14\hdesk\runs\tests\timdom
Please have a review.
Hi Georgina, hopefully after the webinar Moses Launch - The quick course, the next following series will be barge longitudinal strength during launching.kind regards