Sayed Ghalleby
Aerospace
hello everyone I am trying to run a modal analysis using Hyperworks-optistruct, in the output file I am getting the results below
MODAL EFFECTIVE MASS FRACTION FOR SUBCASE 1
RIGID BODY MODES BASED ON REFERENCE POINT AT ORIGIN OF BASIC COORDINATE SYSTEM
--------------------------------------------------------------------------------
Mode Frequency X-TRANS Y-TRANS Z-TRANS X-ROTAT Y-ROTAT Z-ROTAT
--------------------------------------------------------------------------------
1 4.319E+00 6.628E-04 7.561E-04 5.217E-01 9.286E-01 4.759E-01 1.889E-03
2 1.971E+01 2.426E-03 6.075E-03 1.279E-01 2.522E-02 1.030E-01 1.334E-05
3 2.534E+01 3.621E-01 6.083E-04 5.660E-04 6.483E-04 5.799E-02 4.976E-01
4 2.686E+01 1.524E-03 8.835E-03 6.534E-02 1.383E-02 7.862E-02 5.118E-05
5 3.316E+01 1.901E-01 5.524E-04 1.743E-04 5.844E-04 6.866E-04 1.882E-01
6 4.643E+01 5.904E-05 3.293E-03 5.925E-02 4.978E-03 5.161E-02 1.127E-03
7 5.282E+01 1.722E-04 1.936E-03 1.674E-02 1.379E-03 1.540E-02 4.333E-04
8 5.716E+01 3.978E-06 1.182E-04 4.273E-03 3.599E-04 4.634E-03 3.127E-05
9 6.216E+01 1.429E-03 6.587E-05 2.916E-03 1.802E-04 5.716E-03 6.297E-04
10 6.351E+01 5.081E-04 2.477E-06 1.163E-04 3.698E-06 2.461E-04 3.024E-04
11 6.627E+01 3.100E-05 1.808E-03 1.406E-02 9.676E-04 6.560E-03 1.699E-03
12 6.911E+01 1.883E-03 2.867E-06 2.050E-05 1.162E-06 9.190E-06 1.079E-04
13 7.504E+01 1.320E-03 1.949E-04 9.176E-03 6.293E-04 8.941E-03 7.485E-04
14 7.734E+01 2.343E-04 1.079E-03 2.303E-02 1.261E-03 2.395E-02 6.670E-05
15 8.627E+01 4.822E-03 1.125E-04 4.562E-03 2.535E-04 4.264E-03 1.481E-03
16 8.784E+01 8.605E-04 3.486E-04 1.209E-02 2.930E-04 1.239E-02 1.809E-05
17 8.994E+01 3.324E-08 3.722E-04 1.314E-03 9.525E-05 1.509E-03 7.126E-05
18 9.291E+01 9.158E-04 1.087E-03 5.985E-03 2.777E-04 5.982E-03 1.175E-05
19 9.438E+01 3.264E-03 7.094E-04 4.461E-03 2.063E-04 7.366E-03 8.099E-04
20 9.787E+01 1.472E-01 2.544E-04 1.561E-04 6.941E-05 4.578E-03 1.468E-02
21 1.007E+02 2.742E-02 3.381E-03 9.268E-03 2.708E-04 5.672E-03 6.501E-04
22 1.026E+02 1.623E-03 2.757E-06 7.991E-05 6.566E-06 7.983E-05 2.169E-04
23 1.039E+02 4.037E-04 1.160E-04 1.123E-03 4.500E-05 2.151E-03 5.372E-05
24 1.061E+02 1.031E-02 7.686E-04 6.787E-04 1.034E-05 9.338E-05 4.084E-05
25 1.078E+02 2.614E-03 6.722E-05 5.320E-04 2.585E-05 4.342E-03 1.392E-05
26 1.122E+02 3.419E-03 1.899E-04 4.923E-03 2.191E-04 7.207E-03 3.563E-04
27 1.130E+02 7.295E-04 1.057E-04 1.699E-03 9.133E-05 9.677E-04 5.254E-04
28 1.141E+02 1.248E-06 5.534E-05 1.530E-04 5.604E-06 4.626E-05 5.740E-05
29 1.158E+02 2.393E-03 1.000E-06 1.515E-03 7.543E-05 2.613E-03 1.416E-04
30 1.177E+02 1.031E-03 5.651E-05 4.624E-04 2.305E-05 4.914E-04 2.271E-04
31 1.203E+02 3.595E-04 4.648E-04 2.778E-03 8.792E-05 2.773E-03 3.505E-04
32 1.221E+02 3.837E-04 2.110E-09 1.753E-03 8.785E-05 1.821E-03 4.739E-05
33 1.251E+02 1.173E-04 3.204E-04 1.470E-03 7.846E-05 8.162E-04 2.490E-04
34 1.256E+02 1.102E-05 1.438E-04 2.379E-03 2.786E-05 2.350E-03 1.185E-04
35 1.269E+02 2.216E-08 3.505E-04 2.872E-06 5.057E-07 7.940E-06 4.411E-05
36 1.316E+02 8.709E-04 2.034E-03 1.226E-04 5.382E-05 1.430E-06 7.435E-04
37 1.332E+02 2.390E-03 8.663E-04 5.832E-04 2.810E-06 7.558E-04 9.299E-04
38 1.343E+02 5.285E-05 3.072E-05 5.778E-04 2.231E-05 4.229E-04 4.283E-05
39 1.358E+02 4.016E-05 1.938E-04 8.144E-05 1.418E-05 7.039E-05 2.579E-05
40 1.377E+02 2.183E-04 1.098E-03 2.485E-03 4.345E-05 2.016E-03 5.190E-04
41 1.380E+02 1.027E-05 7.692E-05 2.717E-04 3.567E-06 1.503E-04 4.228E-05
42 1.402E+02 3.394E-04 1.623E-03 1.886E-03 3.046E-05 1.519E-03 9.215E-04
43 1.423E+02 2.619E-04 1.796E-04 9.703E-05 5.060E-07 8.019E-05 1.750E-04
44 1.437E+02 4.462E-04 7.383E-05 5.058E-05 3.486E-07 2.337E-04 5.247E-05
45 1.466E+02 1.208E-03 1.416E-04 3.066E-04 5.582E-06 5.746E-04 1.997E-04
46 1.480E+02 3.469E-04 1.304E-04 5.627E-04 1.710E-05 3.732E-04 2.015E-04
SUBCASE TOTAL 7.766E-01 4.068E-02 9.096E-01 9.811E-01 9.070E-01 7.169E-01
--------------------------------------------------------------------------------
,my question is how can we reduce the eff mass fraction for modes 3 and 5
thank you
BR
MODAL EFFECTIVE MASS FRACTION FOR SUBCASE 1
RIGID BODY MODES BASED ON REFERENCE POINT AT ORIGIN OF BASIC COORDINATE SYSTEM
--------------------------------------------------------------------------------
Mode Frequency X-TRANS Y-TRANS Z-TRANS X-ROTAT Y-ROTAT Z-ROTAT
--------------------------------------------------------------------------------
1 4.319E+00 6.628E-04 7.561E-04 5.217E-01 9.286E-01 4.759E-01 1.889E-03
2 1.971E+01 2.426E-03 6.075E-03 1.279E-01 2.522E-02 1.030E-01 1.334E-05
3 2.534E+01 3.621E-01 6.083E-04 5.660E-04 6.483E-04 5.799E-02 4.976E-01
4 2.686E+01 1.524E-03 8.835E-03 6.534E-02 1.383E-02 7.862E-02 5.118E-05
5 3.316E+01 1.901E-01 5.524E-04 1.743E-04 5.844E-04 6.866E-04 1.882E-01
6 4.643E+01 5.904E-05 3.293E-03 5.925E-02 4.978E-03 5.161E-02 1.127E-03
7 5.282E+01 1.722E-04 1.936E-03 1.674E-02 1.379E-03 1.540E-02 4.333E-04
8 5.716E+01 3.978E-06 1.182E-04 4.273E-03 3.599E-04 4.634E-03 3.127E-05
9 6.216E+01 1.429E-03 6.587E-05 2.916E-03 1.802E-04 5.716E-03 6.297E-04
10 6.351E+01 5.081E-04 2.477E-06 1.163E-04 3.698E-06 2.461E-04 3.024E-04
11 6.627E+01 3.100E-05 1.808E-03 1.406E-02 9.676E-04 6.560E-03 1.699E-03
12 6.911E+01 1.883E-03 2.867E-06 2.050E-05 1.162E-06 9.190E-06 1.079E-04
13 7.504E+01 1.320E-03 1.949E-04 9.176E-03 6.293E-04 8.941E-03 7.485E-04
14 7.734E+01 2.343E-04 1.079E-03 2.303E-02 1.261E-03 2.395E-02 6.670E-05
15 8.627E+01 4.822E-03 1.125E-04 4.562E-03 2.535E-04 4.264E-03 1.481E-03
16 8.784E+01 8.605E-04 3.486E-04 1.209E-02 2.930E-04 1.239E-02 1.809E-05
17 8.994E+01 3.324E-08 3.722E-04 1.314E-03 9.525E-05 1.509E-03 7.126E-05
18 9.291E+01 9.158E-04 1.087E-03 5.985E-03 2.777E-04 5.982E-03 1.175E-05
19 9.438E+01 3.264E-03 7.094E-04 4.461E-03 2.063E-04 7.366E-03 8.099E-04
20 9.787E+01 1.472E-01 2.544E-04 1.561E-04 6.941E-05 4.578E-03 1.468E-02
21 1.007E+02 2.742E-02 3.381E-03 9.268E-03 2.708E-04 5.672E-03 6.501E-04
22 1.026E+02 1.623E-03 2.757E-06 7.991E-05 6.566E-06 7.983E-05 2.169E-04
23 1.039E+02 4.037E-04 1.160E-04 1.123E-03 4.500E-05 2.151E-03 5.372E-05
24 1.061E+02 1.031E-02 7.686E-04 6.787E-04 1.034E-05 9.338E-05 4.084E-05
25 1.078E+02 2.614E-03 6.722E-05 5.320E-04 2.585E-05 4.342E-03 1.392E-05
26 1.122E+02 3.419E-03 1.899E-04 4.923E-03 2.191E-04 7.207E-03 3.563E-04
27 1.130E+02 7.295E-04 1.057E-04 1.699E-03 9.133E-05 9.677E-04 5.254E-04
28 1.141E+02 1.248E-06 5.534E-05 1.530E-04 5.604E-06 4.626E-05 5.740E-05
29 1.158E+02 2.393E-03 1.000E-06 1.515E-03 7.543E-05 2.613E-03 1.416E-04
30 1.177E+02 1.031E-03 5.651E-05 4.624E-04 2.305E-05 4.914E-04 2.271E-04
31 1.203E+02 3.595E-04 4.648E-04 2.778E-03 8.792E-05 2.773E-03 3.505E-04
32 1.221E+02 3.837E-04 2.110E-09 1.753E-03 8.785E-05 1.821E-03 4.739E-05
33 1.251E+02 1.173E-04 3.204E-04 1.470E-03 7.846E-05 8.162E-04 2.490E-04
34 1.256E+02 1.102E-05 1.438E-04 2.379E-03 2.786E-05 2.350E-03 1.185E-04
35 1.269E+02 2.216E-08 3.505E-04 2.872E-06 5.057E-07 7.940E-06 4.411E-05
36 1.316E+02 8.709E-04 2.034E-03 1.226E-04 5.382E-05 1.430E-06 7.435E-04
37 1.332E+02 2.390E-03 8.663E-04 5.832E-04 2.810E-06 7.558E-04 9.299E-04
38 1.343E+02 5.285E-05 3.072E-05 5.778E-04 2.231E-05 4.229E-04 4.283E-05
39 1.358E+02 4.016E-05 1.938E-04 8.144E-05 1.418E-05 7.039E-05 2.579E-05
40 1.377E+02 2.183E-04 1.098E-03 2.485E-03 4.345E-05 2.016E-03 5.190E-04
41 1.380E+02 1.027E-05 7.692E-05 2.717E-04 3.567E-06 1.503E-04 4.228E-05
42 1.402E+02 3.394E-04 1.623E-03 1.886E-03 3.046E-05 1.519E-03 9.215E-04
43 1.423E+02 2.619E-04 1.796E-04 9.703E-05 5.060E-07 8.019E-05 1.750E-04
44 1.437E+02 4.462E-04 7.383E-05 5.058E-05 3.486E-07 2.337E-04 5.247E-05
45 1.466E+02 1.208E-03 1.416E-04 3.066E-04 5.582E-06 5.746E-04 1.997E-04
46 1.480E+02 3.469E-04 1.304E-04 5.627E-04 1.710E-05 3.732E-04 2.015E-04
SUBCASE TOTAL 7.766E-01 4.068E-02 9.096E-01 9.811E-01 9.070E-01 7.169E-01
--------------------------------------------------------------------------------
,my question is how can we reduce the eff mass fraction for modes 3 and 5
thank you
BR
