Modal participation factors and effective mass are 0.0 for rotation with solid elements

[victorkemp]

Affects at least versions 16.0.0 and 17.0.0

Typical result with CHEXA or CTETRA. The R1, R2, R3 columns are all zero even thought the modes have some sort of average rotation.

                                        M O D A L   P A R T I C I P A T I O N   F A C T O R S
                                             (dimensionless, in coordinate sys        0)
                                        Reference point is the basic coordinate system origin

             MODE     CYCLES          T1            T2            T3            R1            R2            R3
              NUM
                1  4.344700E-02 -3.259786E+00 -7.414451E+01  5.271971E+00  0.000000E+00  0.000000E+00  0.000000E+00
                2  4.844649E-02  3.553292E+01 -7.060376E+00 -5.554197E+01  0.000000E+00  0.000000E+00  0.000000E+00
                3  1.000479E-01 -4.770255E+00  3.304241E+01 -5.400590E+00  0.000000E+00  0.000000E+00  0.000000E+00
                4  1.049954E-01  5.530692E+01  3.202215E+00  5.885612E+01  0.000000E+00  0.000000E+00  0.000000E+00
                5  2.826797E-01  3.508956E+00 -3.440724E+01  1.040917E-01  0.000000E+00  0.000000E+00  0.000000E+00
                6  2.991055E-01  5.317241E+01  2.141682E+00 -3.504006E+00  0.000000E+00  0.000000E+00  0.000000E+00
                7  6.448692E-01 -2.411502E+00  2.002346E+01  8.952245E-01  0.000000E+00  0.000000E+00  0.000000E+00

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                                  E F F E C T I V E   M O D A L   M A S S E S   O R   W E I G H T S
                                                   (in coordinate system        0)
                                     Units are same as units for mass input in the Bulk Data Deck
                                        Reference point is the basic coordinate system origin

             MODE     CYCLES          T1            T2            T3            R1            R2            R3
              NUM
                1  4.344700E-02  1.062621E+01  5.497408E+03  2.779368E+01  0.000000E+00  0.000000E+00  0.000000E+00
                2  4.844649E-02  1.262588E+03  4.984890E+01  3.084910E+03  0.000000E+00  0.000000E+00  0.000000E+00
                3  1.000479E-01  2.275533E+01  1.091801E+03  2.916637E+01  0.000000E+00  0.000000E+00  0.000000E+00
                4  1.049954E-01  3.058855E+03  1.025418E+01  3.464043E+03  0.000000E+00  0.000000E+00  0.000000E+00
                5  2.826797E-01  1.231278E+01  1.183858E+03  1.083508E-02  0.000000E+00  0.000000E+00  0.000000E+00
                6  2.991055E-01  2.827305E+03  4.586803E+00  1.227806E+01  0.000000E+00  0.000000E+00  0.000000E+00
                7  6.448692E-01  5.815344E+00  4.009391E+02  8.014268E-01  0.000000E+00  0.000000E+00  0.000000E+00
                                 ------------  ------------  ------------  ------------  ------------  ------------
                 Sum all modes:  7.200258E+03  8.238696E+03  6.619003E+03  0.000000E+00  0.000000E+00  0.000000E+00
              Total model mass:  9.376682E+03  9.376682E+03  9.376682E+03  1.015807E+05  1.937848E+05  1.015807E+05
        Modes % of total mass*:        76.79%        87.86%        70.59%         0.00%         0.00%         0.00%