Hi StressFEA, nice kick :)
I have performed the analyisis constrained and unconstrained, and I get the same results, therefore I think that is not a constrain issue. Anyway the model is constrained just in one node which is joined to the structure by means of a MPC.
initial temperature: 20ºC...
Hi everybody,
I´m performing a thermoelastic check to a FEM with Patran/Nastran, that is formed just by shells, beams and MPCs. I have followed the rules to perform the analysis as are; same CTE, poisson´s coef. and Elastic modulus, as well as RBE2 with 0 length and no offsets, the structure is...
Hi everybody,
I´m performing a thermoelastic check to a FEM with Patran/Nastran, that is formed just by shells, beams and MPCs. I have followed the rules to perform the analysis as are; same CTE, poisson´s coef. and Elastic modulus, as well as RBE2 with 0 length and no offsets, the structure is...
Thank you Blas.
I know that the first eigenvalue of 200Hz means a high stiffness, but I need it because ESA asks for a first mode >140 Hz. Anyway I will check the boundary conditions because I have suposed the fixation points as embeeded (0 dof in the central node of the MPC).
Thanks again,
Pedro.
Thank you very much to both of you,
I knew that results from modal were only to get frecuencies and mode shapes but I didn´t know why, now I know. I think that my units are consistent, because I used mm, tonns, MPa, N.
Pedro.
Hello everybody,
I have performed a normal modes analysis to my model and I have obtained the first eigenfrecuency at 200Hz, but when I look at the deformation it is very high (20mm).
Does anybody knows if it is normal??? because I have seen other analyses and displacements are lower.
I don´t...
