Calculate TwFAM1Sh(2-6) and TwFAM2Sh(2-6)

[Kazuya.Nishiyama]

Dear Jason.

Thank you for your response.

Linearization analysis was performed using the test14 file.
The results of the analysis are shown below.
・The value differs from the inertia described in this topic by about two orders of magnitude.Why is this?

Tower fore-aft modes shapes

Dear Yinping Yang, The equations you stated for cm_loc and cm_axial are correct. As I said in my prior post, I do not believe that the tower-top mass input data are specified correctly for the WindPACT 1.5-MW turbine in Test03_tower.bmi of the BModes CertTest. I need to ask Gunjit Bir about this. You are correct that setting ADAMSPrep equal to 2 or 3 will cause FAST to generate the ADAMS dataset. In order to find the cm_loc and cm_axial, you should select all of the tower-top PARTs and choo…

・In test14 I have no damping on the blades and tower, is it better to have no damping in the linearized analysis?

・Is it possible to calculate natural frequencies with BModes?

(M:6×6)
7.81E+04 0.00E+00 0 0 6553000 -0.01
0.00E+00 7.81E+04 0 -6553000 0 -95800.00
0.0 0.0 78060.000 0.0 95800.0 0.00
0.0 -6553000.0 0.008 553100000.0 0.0 7941000.00
6553000.0 0.0 95800.000 0.0 551900000.0 -0.76
0.0 -95800.0 0.000 7941000.0 -0.8 1815000.00

m=tip_mass=78060.000
x_g=cm_loc=-1.227
y_g=0.000
z_g=83.948
z_g-TowerHt=cm_axial=1.558
Ixx=553100000.00
Iyy=551900000.00
Izz=1815000.00
Ixy=0.01
Iyz=-0.76
Izx=7941000.00

Converted to top tower
Ixx=552910460.38
Iyy=551782429.95
Izz=1697428.39
Ixy=0.00
Iyz=0.00
Izx=63059480850720.10

・fst

・blade

・tower

・Ptfm

・wind

・linear.dat

・fsm