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Point mass in model

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MadAstronaut

Aerospace
Jun 21, 2018
1
Hi everybody

I'm trying to simulate the fuel mass of a vehicle. In order to do this I've created a Reference point and made a coupling constraint between said point and the inner surface of the fuel tank. After that, I created a point mass for the reference point. However when I run the job I get the following message

Error in job ModalAnalysisMono: THREE FACTORIZATIONS IN A ROW FAILED. CHECK THE MODEL. IT IS POSSIBLE THAT THE MODEL CONTAINS THE KINEMATIC COUPLING DEFINITION SET UP IN A WAY THAT A DEGREE OF FREEDOM HAS NEITHER MASS NOR STIFFNESS

Any ideas to solve this??? I'd be very thankful!!
 
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