RIGID BODY CHECKS IN 4, 5 and 6 DIRECTIONS FAIL 2

[HawksOkeyoJr]

Hallo guys,

I am not newbie in NASTRAN environment, but I don't seem to crack what on earth is wrong with my model (Model Attached).
I ran a FREE-FREE check on my structure and requested for all the 'SETS', to my surprise, the model fails the 4, 5 and 6 directions while the eigenfrequencies show that the structure is fully a rigid one. Can somebody with more experience help me crack it please!. I will really be grateful for your effort. Thanks in advance.

*** USER INFORMATION MESSAGE 7570 (GPWG1D)
RESULTS OF RIGID BODY CHECKS OF MATRIX KGG (G-SET) FOLLOW:
PRINT RESULTS IN ALL SIX DIRECTIONS AGAINST THE LIMIT OF 1.232662E-04
DIRECTION STRAIN ENERGY PASS/FAIL
--------- ------------- ---------
1 1.898201E-09 PASS
2 1.770204E-09 PASS
3 1.048686E-09 PASS
4 1.633240E-03 FAIL
5 1.100441E+01 FAIL
6 4.751907E+00 FAIL

MODE EXTRACTION EIGENVALUE
NO. ORDER
1 1 -9.614290E-06
2 2 -3.726920E-06
3 3 -1.669621E-06
4 4 -4.575413E-07
5 5 4.400790E-07
6 6 3.495363E-06
7 7 4.155432E+02
8 8 5.656006E+02
9 9 8.297285E+03
10 10 1.224819E+04

 

[stressebookllc]

@HawksOkeyoJr

Not only did I delete the manually added text for AUTOSPC he/she had, but I also unchecked AUTOSPC option in the analysis settings.

That means PARAM, AUTOSPC, NO is printed in the deck (that is what I meant my removed) but you had no way of knowing that, so you get the benefit of the doubt.

I do not like AUTOSPC myself. I'd rather turn it off, see the fatal, and then diagnose using a normal modes analysis to find my mechanisms.

http://www.stressebook.com

Stressing Stresslessly!

 

[stressebookllc]

And you are very welcome..

http://www.stressebook.com

Stressing Stresslessly!

 

[HawksOkeyoJr]

@ nlgyro : Thank you very much, that was some great observation and it was great to have learned something from all this. I thank all of you who have contributed to this question.
@ stressebookllc, Thanks buddy for making it clear. You are right, I had no means of knowing that you had removed it. I thank you for your contribution.