元芳，你快来看看

这个是什么原因造成的？坐等好人
*** USER WARNING MESSAGE 6644 (FRPROD)
SOME OR ALL COMPUTED EXCITATION FREQUENCIES ARE OUTSIDE THE RANGE F1 AND F2 FOR FREQ4 BULK DATA ENTRY WITH ID =1
THESE COMPUTED EXCITATION FREQUENCIES ARE IGNORED.
1 MSC.NASTRAN JOB CREATED ON 27-MAR-13 AT 21:18:20 MARCH 28, 2013 MD NASTRAN 4/27/11 PAGE 7653
RANDOM
0 SUBCASE 1
*** USER WARNING MESSAGE 7697 (GKAM1A)
ONE OR MORE MODAL DAMPING VALUES FOR STRUCTURE MODES ARE EITHER NEGATIVE OR HAVE RESULTED FROM EXTRAPOLATION OF THE
TABDMP1 1 TABLE DATA AS SHOWN BELOW:
CYCLIC FREQUENCY = 4.565918E+02 MODAL DAMPING VALUE = 3.000000E-02 (BY EXTRAPOLATION BEYOND THE RIGHT END OF THE TABLE)
CYCLIC FREQUENCY = 7.479011E+02 MODAL DAMPING VALUE = 3.000000E-02 (BY EXTRAPOLATION BEYOND THE RIGHT END OF THE TABLE)
CYCLIC FREQUENCY = 8.596663E+02 MODAL DAMPING VALUE = 3.000000E-02 (BY EXTRAPOLATION BEYOND THE RIGHT END OF THE TABLE)
CYCLIC FREQUENCY = 1.277522E+03 MODAL DAMPING VALUE = 3.000000E-02 (BY EXTRAPOLATION BEYOND THE RIGHT END OF THE TABLE)
CYCLIC FREQUENCY = 2.266442E+03 MODAL DAMPING VALUE = 3.000000E-02 (BY EXTRAPOLATION BEYOND THE RIGHT END OF THE TABLE)
CYCLIC FREQUENCY = 2.464301E+03 MODAL DAMPING VALUE = 3.000000E-02 (BY EXTRAPOLATION BEYOND THE RIGHT END OF THE TABLE)