JaviSanchez
Aerospace
- Aug 4, 2011
- 5
Hi there,
Let's see if some of you can help me with the following issue, please:
I am working on the mechanical analysis of a satellite (spacecraft(SC)+ payload(PL)). I need to create an external superelement (ESE) of th PL and validate the process by comparing the results obtained with the complete physical model (SC+PL) to the results obtained with the model using the ESE (SC+ESE).
I am recovering accelerations and displacements in some nodes and forces in some CELAS, CBUSH and CQUAD elements.
A modal analysis shows a perefect correlation between the two models (with and without ESE).
I ran a sine vibration analysis and I got got also a perfect correlation between the two models when comparing accelerations and displacements. However, i didn't get a good correlation with the forces in some CELAS elements.
The reduction method used for the external superelement is the Craig-Bampton method.
Do you know if there use to be any trouble when trying to recover forces in a dynamic analysis with Nastran when using external superelements (by Craig-Bampton method)?
Thank you in advance. Have a good day!
Javi
Let's see if some of you can help me with the following issue, please:
I am working on the mechanical analysis of a satellite (spacecraft(SC)+ payload(PL)). I need to create an external superelement (ESE) of th PL and validate the process by comparing the results obtained with the complete physical model (SC+PL) to the results obtained with the model using the ESE (SC+ESE).
I am recovering accelerations and displacements in some nodes and forces in some CELAS, CBUSH and CQUAD elements.
A modal analysis shows a perefect correlation between the two models (with and without ESE).
I ran a sine vibration analysis and I got got also a perfect correlation between the two models when comparing accelerations and displacements. However, i didn't get a good correlation with the forces in some CELAS elements.
The reduction method used for the external superelement is the Craig-Bampton method.
Do you know if there use to be any trouble when trying to recover forces in a dynamic analysis with Nastran when using external superelements (by Craig-Bampton method)?
Thank you in advance. Have a good day!
Javi