这个warning谁知道是什么原因造成的？
*** 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 MARCH28, 2013MD NASTRAN 4/27/11 PAGE7653
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+02MODAL DAMPING VALUE =3.000000E-02(BY EXTRAPOLATION BEYOND THE RIGHT END OF THE TABLE)
CYCLIC FREQUENCY =7.479011E+02MODAL DAMPING VALUE =3.000000E-02(BY EXTRAPOLATION BEYOND THE RIGHT END OF THE TABLE)
CYCLIC FREQUENCY =8.596663E+02MODAL DAMPING VALUE =3.000000E-02(BY EXTRAPOLATION BEYOND THE RIGHT END OF THE TABLE)
CYCLIC FREQUENCY =1.277522E+03MODAL DAMPING VALUE =3.000000E-02(BY EXTRAPOLATION BEYOND THE RIGHT END OF THE TABLE)
CYCLIC FREQUENCY =2.266442E+03MODAL DAMPING VALUE =3.000000E-02(BY EXTRAPOLATION BEYOND THE RIGHT END OF THE TABLE)
CYCLIC FREQUENCY =2.464301E+03MODAL DAMPING VALUE =3.000000E-02(BY EXTRAPOLATION BEYOND THE RIGHT END OF THE TABLE) 在做模态计算时，你设置了模态的频率范围，把这个范围扩大一下试试看。
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