Hello,
I am looking at extracting accelerations on the body to be used as input to FEA (NASTRAN) body to calculate the stresses. Acceleration is calculated at the chassis.
I am running the model on digital tracks and using F-TIRES.
I am facing the following issues
1) If I consider the chassis to be a Rigid body, the accelerations (at attachment points) calculated die down after 20Hz. Measured acceleration (from testing) still has energy after 20Hz.
2) If I convert my Rigid chassis with a Flex body, I observe spikes in the acceleration vs time graph. These spikes do not go even when I use the SI2 solver or HHT.
3) Flex body does not simulate after reaching a point when General bushing definition -bushes are used. It runs well when the standard bushes are used.
Require help on
1) Any solver settings that I need to try for the above issues I am facing?
2) Whether it is a good idea to use acceleration calculated from ADAMS to be used as input in the FEA model?
3) Any other general help if people have observed such a phenomenon in your simulations and found a way around it?
Thank you
