Dear Jason.
Thank you for your answer.
I referred to this forum.
(Tower fore-aft modes shapes - #9 by Jason.Jonkman)
I did a linear analysis and the RNA mass matrix is shown below.
The weight and moment of inertia are larger than the values given in the forum and I am trying to figure out why.
Since it was based on the WP1.5MW model and I did not make any major changes (just a few dimensions, no weight changes), I expected to get almost the same results.
However, the results were very different.
Is there something wrong with my settings?
*When I check the .fsm file, the RNA weight is 83670kg even though I did not change anything in the WP1.5MW model and did the analysis.
However, even if the weight is correct, I believe the moment of inertia is too large.
[mass matrix].
83670.00 0.00 0.00 0.00 5401000.00 0.00
0.00 83670.00 0.00 -5401000.00 0.00 -146900.00
0.00 0.00 83670.00 0.00 146900.00 0.00
0.00 -5401000.00 0.00 351500000.00 0.01 9393000.00
5401000.00 0.00 146900.00 0.01 350500000.00 -0.33
0.00 -146900.00 0.00 9393000.00 -0.33 1925000.00
Changes
・fst file
OverHang (change of several tens of cm)
NacCMx,y,z,n (change of several tens of cm)
Twr2Shft(change of tens of cm)
TowerHT(TwrRBHt+0.01)
TwrRBHt(20m shorter than WP1.5MW model)
※fsmを確認するとRotor Inertia=2953255.5kg-m^2
・AD File
HH(TowerHt+Twr2Shft+OverHang*SIN(ShftTilt))
・Tower file
TMassDen=0.01
TwFA,TwSSStiff=0.01
