Dear @jjonkman,
After listening to your answer, I have the following confusion :
- As mentioned above, there are 10 HtFract values in my ElastoDyn_ tower.dat file, which divides the tower into 9 segments, but the BModes_tower_ prop.dat file I found in github today seems to have 20 nodes ( as shown below ), so I want to delete it to be consistent with my file, but it involves two parameters, flap _ stff and edge _ stff.Are these two parameters the same as the TwFAStif and TwSSStif parameters in the ElastoDyn _ tower.dat file I mentioned earlier ?
- In the BMode file I found there is a BModes_ tower.echo file, in the Finite element discretization section of this file has some parameters, such as nselt value is 61, I do not know how to get 61, whether need to modify the parameters of the Finite element discretization section.
- Because my segmentation of the tower is not the same as the BMode file I found, in addition to the parameters mentioned in the first and second points, what else do I need to modify ?( (Attached below I found today in the BMode file of the three sub-files, BMode file source link is GitHub - ptrbortolotti/IEA15_BModes )
====================== BModes v3.00 Main Input File ==================
IEA15 tower
--------- General parameters ---------------------------------------------------------------------
True Echo Echo input file contents to *.echo file if true.
2 beam_type 1: blade, 2: tower (-)
0. romg: rotor speed (rpm), automatically set to zero for tower modal analysis
1.0 romg_mult: rotor speed muliplicative factor (-)
144.386 radius: rotor tip radius measured along coned blade axis OR tower height (m)
15. hub_rad: hub radius measured along coned blade axis OR tower rigid-base height (m)
0. precone: built-in precone angle (deg), automatically set to zero for a tower
0. bl_thp: blade pitch setting (deg), automatically set to zero for a tower
1 hub_conn: hub-to-blade connection [1: cantilevered; other options not yet available]
20 modepr: number of modes to be printed (-)
t TabDelim (true: tab-delimited output tables; false: space-delimited tables)
f mid_node_tw (true: output twist at mid-node of elements; false: no mid-node outputs)
--------- Blade-tip or tower-top mass properties --------------------------------------------
950057.799 tip_mass blade-tip or tower-top mass (see users’ manual) (kg)
-7.16870 cm_loc tip-mass c.m. offset from the tower axis measured along the tower-tip x reference axis (m)
4.584963 cm_axial tip-mass c.m. offset tower tip measures axially along the z axis (m)
3.7173e+08 ixx_tip blade lag or tower s-s mass moment of inertia about the tip-section x reference axis (kg-m^2)
2.6268e+08 iyy_tip blade flap or tower f-a mass moment of inertia about the tip-section y reference axis (kg-m^2)
3.5877e+08 izz_tip torsion mass moment of inertia about the tip-section z reference axis (kg-m^2)
0.0 ixy_tip cross product of inertia about x and y reference axes(kg-m^2)
1.6418e+07 izx_tip cross product of inertia about z and x reference axes(kg-m^2)
0.0 iyz_tip cross product of inertia about y and z reference axes(kg-m^2)
--------- Distributed-property identifiers --------------------------------------------------------
1 id_mat: material_type [1: isotropic; non-isotropic composites option not yet available]
‘BModes_tower_prop.dat’ sec_props_file name of beam section properties file (-)
Property scaling factors…
1.0 sec_mass_mult: mass density multiplier (-)
1.0 flp_iner_mult: blade flap or tower f-a inertia multiplier (-)
1.0 lag_iner_mult: blade lag or tower s-s inertia multiplier (-)
1.0 flp_stff_mult: blade flap or tower f-a bending stiffness multiplier (-)
1.0 edge_stff_mult: blade lag or tower s-s bending stiffness multiplier (-)
1.0 tor_stff_mult: torsion stiffness multiplier (-)
1.0 axial_stff_mult: axial stiffness multiplier (-)
1.0 cg_offst_mult: cg offset multiplier (-)
1.0 sc_offst_mult: shear center multiplier (-)
1.0 tc_offst_mult: tension center multiplier (-)
--------- Finite element discretization --------------------------------------------------
61 nselt: no of blade or tower elements (-)
Distance of element boundary nodes from blade or flexible-tower root (normalized wrt blade or tower length), el_loc()
0 0.003481894 0.010445682 0.017409471 0.024373259 0.031337047 0.038300836 0.045264624 0.052228412 0.059192201 0.066155989 0.073119777 0.080083565 0.087047354 0.094011142 0.10097493 0.107938719 0.114902507 0.121866295 0.128830084 0.135793872 0.13990 0.149721448 0.156685237 0.163649025 0.170612813 0.177576602 0.18454039 0.191504178 0.198467967 0.205431755 0.212395543 0.219359331 0.22632312 0.233286908 0.240250696 0.247214485 0.250696379 0.320334262 0.37971 0.424791072 0.45961 0.486635 0.51366 0.54068 0.5677 0.594715 0.62173 0.64875 0.67577 0.70279 0.72981 0.75683 0.78385 0.81087 0.83789 0.864905 0.89192 0.91894 0.94596 0.97298 1.0
--------- Properties of tower support subsystem (read only if beam_type is 2) ------------
0 tow_support: : aditional tower support [0: no additional support; 1: floating-platform or monopile with or without tension wires] (-)
0.0 draft : depth of tower base from the ground or the MSL (mean sea level) (m)
0.0 cm_pform : distance of platform c.m. below the MSL (m)
0.0 mass_pform : platform mass (kg)
Platform mass inertia 3X3 matrix (i_matrix_pform):
0. 0. 0.
0. 0. 0.
0. 0. 0.
0.0 ref_msl : distance of platform reference point below the MSL (m)
Platform-reference-point-referred hydrodynamic 6X6 matrix (hydro_M):
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
Platform-reference-point-referred hydrodynamic 6X6 stiffness matrix (hydro_K):
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
Mooring-system 6X6 stiffness matrix (mooring_K):
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
Distributed (hydrodynamic) added-mass per unit length along a flexible portion of the tower length:
0 n_secs_m_distr: number of sections at which added mass per unit length is specified (-)
0. 0. : z_distr_m [row array of size n_added_m_pts; section locations wrt the flexible tower base over which distributed mass is specified] (m)
0. 0. : distr_m [row array of size n_added_m_pts; added distributed masses per unit length] (kg/m)
Distributed elastic stiffness per unit length along a flexible portion of the tower length:
0 n_secs_k_distr: number of points at which distributed stiffness per unit length is specified (-)
Tension wires data
0 n_attachments: no of wire-attachment locations on tower [0: no tension wires] (-)
0 n_wires: no of wires attached at each location (must be 3 or higher) (-)
0 node_attach: node numbers of attacments location (node number must be more than 1 and less than nselt+2) (-)
0.e0 0.e0 wire_stfness: wire spring constant in each set (see users’ manual) (N/m)
0. 0. th_wire: angle of tension wires (wrt the horizontal ground plane) at each attachment point (deg)
END of Main Input File Data *********************************************************************
T Echo - Echo input file contents to *.echo file if true
2 beam_type - beam type, 1: blade; 2: tower
0.0000E+00 rot_rpm - rotor speed (rpm)
1.0000E+00 rpm_mult - rotor speed multiplicative factor
1.4439E+02 radius - rotor tip radius or tower height above ground (m)
1.5000E+01 rroot - hub radius or tower-base height (m)
0.0000E+00 btp - precone (deg)
0.0000E+00 bl_thp - blade pitch setting (deg)
1 hub_conn - hub-to-blade connectivity identifier
20 modepr - number of modes to be printed
T TabDelim - output format (t: std; f: tab-delimited)
F mid_node_tw - t: output twist at mid nodes; f: do otherwise
--------- Blade-tip or tower-top mass properties --------------------------------------------
9.5006E+05 tip_mass - tip mass
-7.1687E+00 cm_loc - tip-mass c.m. location wrt the reference axis
4.5850E+00 cm_axial - tip-mass c.m. axial offset wrt tip
3.7173E+08 ixx_tip - mass moment of inertia about x axis (wt-specific)
2.6268E+08 iyy_tip - mass moment of inertia about y axis
3.5877E+08 izz_tip - mass moment of inertia about z axis
0.0000E+00 ixy_tip - cross product of inertia
1.6418E+07 izx_tip - cross product of inertia
0.0000E+00 iyz_tip - cross product of inertia
--------- Distributed-property identifiers --------------------------------------------------------
1 id_mat - material isotropy identifier (not used; use later)
sec_props_file - name of beam section properties file (-)
“BModes_tower_prop.dat”
Property scaling factors…
1.0000E+00 sec_mass_mult - mass density multiplier (-)
1.0000E+00 flp_iner_mult - blade flap or tower f-a inertia multiplier (-)
1.0000E+00 lag_iner_mult - blade lag or tower s-s inertia multiplier (-)
1.0000E+00 flp_stff_mult - blade flap or tower f-a bending stiffness multiplier (-)
1.0000E+00 edge_stff_mult - blade lag or tower s-s bending stiffness multiplier (-)
1.0000E+00 tor_stff_mult - torsion stiffness multiplier (-)
1.0000E+00 axial_stff_mul - axial stiffness multiplier (-)
1.0000E+00 cg_offst_mult - cg offset multiplier (-)
1.0000E+00 sc_offst_mult - shear center multiplier (-)
1.0000E+00 tc_offst_mult - tension center multiplier (-)
--------- Finite element discretization --------------------------------------------------
61 nselt - number of blade or tower elements (-)
Distance of element boundary nodes from blade or flexible-tower root (normalized wrt blade or tower length), el_loc()
0.0000E+00 el_loc - array of normalized element locations (-)
3.4819E-03 el_loc - array of normalized element locations (-)
1.0446E-02 el_loc - array of normalized element locations (-)
1.7409E-02 el_loc - array of normalized element locations (-)
2.4373E-02 el_loc - array of normalized element locations (-)
3.1337E-02 el_loc - array of normalized element locations (-)
3.8301E-02 el_loc - array of normalized element locations (-)
4.5265E-02 el_loc - array of normalized element locations (-)
5.2228E-02 el_loc - array of normalized element locations (-)
5.9192E-02 el_loc - array of normalized element locations (-)
6.6156E-02 el_loc - array of normalized element locations (-)
7.3120E-02 el_loc - array of normalized element locations (-)
8.0084E-02 el_loc - array of normalized element locations (-)
8.7047E-02 el_loc - array of normalized element locations (-)
9.4011E-02 el_loc - array of normalized element locations (-)
1.0097E-01 el_loc - array of normalized element locations (-)
1.0794E-01 el_loc - array of normalized element locations (-)
1.1490E-01 el_loc - array of normalized element locations (-)
1.2187E-01 el_loc - array of normalized element locations (-)
1.2883E-01 el_loc - array of normalized element locations (-)
1.3579E-01 el_loc - array of normalized element locations (-)
1.3990E-01 el_loc - array of normalized element locations (-)
1.4972E-01 el_loc - array of normalized element locations (-)
1.5669E-01 el_loc - array of normalized element locations (-)
1.6365E-01 el_loc - array of normalized element locations (-)
1.7061E-01 el_loc - array of normalized element locations (-)
1.7758E-01 el_loc - array of normalized element locations (-)
1.8454E-01 el_loc - array of normalized element locations (-)
1.9150E-01 el_loc - array of normalized element locations (-)
1.9847E-01 el_loc - array of normalized element locations (-)
2.0543E-01 el_loc - array of normalized element locations (-)
2.1240E-01 el_loc - array of normalized element locations (-)
2.1936E-01 el_loc - array of normalized element locations (-)
2.2632E-01 el_loc - array of normalized element locations (-)
2.3329E-01 el_loc - array of normalized element locations (-)
2.4025E-01 el_loc - array of normalized element locations (-)
2.4721E-01 el_loc - array of normalized element locations (-)
2.5070E-01 el_loc - array of normalized element locations (-)
3.2033E-01 el_loc - array of normalized element locations (-)
3.7971E-01 el_loc - array of normalized element locations (-)
4.2479E-01 el_loc - array of normalized element locations (-)
4.5961E-01 el_loc - array of normalized element locations (-)
4.8663E-01 el_loc - array of normalized element locations (-)
5.1366E-01 el_loc - array of normalized element locations (-)
5.4068E-01 el_loc - array of normalized element locations (-)
5.6770E-01 el_loc - array of normalized element locations (-)
5.9471E-01 el_loc - array of normalized element locations (-)
6.2173E-01 el_loc - array of normalized element locations (-)
6.4875E-01 el_loc - array of normalized element locations (-)
6.7577E-01 el_loc - array of normalized element locations (-)
7.0279E-01 el_loc - array of normalized element locations (-)
7.2981E-01 el_loc - array of normalized element locations (-)
7.5683E-01 el_loc - array of normalized element locations (-)
7.8385E-01 el_loc - array of normalized element locations (-)
8.1087E-01 el_loc - array of normalized element locations (-)
8.3789E-01 el_loc - array of normalized element locations (-)
8.6491E-01 el_loc - array of normalized element locations (-)
8.9192E-01 el_loc - array of normalized element locations (-)
9.1894E-01 el_loc - array of normalized element locations (-)
9.4596E-01 el_loc - array of normalized element locations (-)
9.7298E-01 el_loc - array of normalized element locations (-)
1.0000E+00 el_loc - array of normalized element locations (-)
--------- Properties of tower support subsystem (read only if beam_type is 2) ------------
0 tow_support: : aditional tower support [0: no additional support; 1: floating-platform or monopile with or without tension wires] (-)
0 tow_support - aditional tower support (-)
Tower section properties
20 n_secs - number of blade or tower sections (-)
sec_loc str_tw tw_iner mass_den flp_iner edge_iner flp_stff edge_stff tor_stff axial_stff
(-) (deg) (deg) (kg/m) (kg-m) (kg-m) (Nm^2) (Nm^2) (Nm^2) (N)
0.00000 0.000 0.000 10314.844 0.000 0.000 3.07E+12 3.07E+12 1.00E+14 1.00E+14 0.000 0.000 0.000
0.10047 0.000 0.000 10314.844 0.000 0.000 3.07E+12 3.07E+12 1.00E+14 1.00E+14 0.000 0.000 0.000
0.10048 0.000 0.000 9523.819 0.000 0.000 2.83E+12 2.83E+12 1.00E+14 1.00E+14 0.000 0.000 0.000
0.20095 0.000 0.000 9453.084 0.000 0.000 2.77E+12 2.77E+12 1.00E+14 1.00E+14 0.000 0.000 0.000
0.20096 0.000 0.000 8761.306 0.000 0.000 2.57E+12 2.57E+12 1.00E+14 1.00E+14 0.000 0.000 0.000
0.30142 0.000 0.000 8333.524 0.000 0.000 2.21E+12 2.21E+12 1.00E+14 1.00E+14 0.000 0.000 0.000
0.30143 0.000 0.000 7943.340 0.000 0.000 2.11E+12 2.11E+12 1.00E+14 1.00E+14 0.000 0.000 0.000
0.40190 0.000 0.000 7428.459 0.000 0.000 1.72E+12 1.72E+12 1.00E+14 1.00E+14 0.000 0.000 0.000
0.40191 0.000 0.000 7087.214 0.000 0.000 1.64E+12 1.64E+12 1.00E+14 1.00E+14 0.000 0.000 0.000
0.50237 0.000 0.000 6538.098 0.000 0.000 1.29E+12 1.29E+12 1.00E+14 1.00E+14 0.000 0.000 0.000
0.50238 0.000 0.000 6197.175 0.000 0.000 1.22E+12 1.22E+12 1.00E+14 1.00E+14 0.000 0.000 0.000
0.60285 0.000 0.000 5616.516 0.000 0.000 9.12E+11 9.12E+11 1.00E+14 1.00E+14 0.000 0.000 0.000
0.60286 0.000 0.000 5253.478 0.000 0.000 8.53E+11 8.53E+11 1.00E+14 1.00E+14 0.000 0.000 0.000
0.70332 0.000 0.000 4910.276 0.000 0.000 6.97E+11 6.97E+11 1.00E+14 1.00E+14 0.000 0.000 0.000
0.70333 0.000 0.000 4334.168 0.000 0.000 6.15E+11 6.15E+11 1.00E+14 1.00E+14 0.000 0.000 0.000
0.80380 0.000 0.000 4232.817 0.000 0.000 5.73E+11 5.73E+11 1.00E+14 1.00E+14 0.000 0.000 0.000
0.80380 0.000 0.000 3673.388 0.000 0.000 4.98E+11 4.98E+11 1.00E+14 1.00E+14 0.000 0.000 0.000
0.90427 0.000 0.000 3577.283 0.000 0.000 4.60E+11 4.60E+11 1.00E+14 1.00E+14 0.000 0.000 0.000
0.90428 0.000 0.000 4120.141 0.000 0.000 5.29E+11 5.29E+11 1.00E+14 1.00E+14 0.000 0.000 0.000
1.00000 0.000 0.000 4074.837 0.000 0.000 5.12E+11 5.12E+11 1.00E+14 1.00E+14 0.000 0.000 0.000
Tower section properties
20 n_secs: number of blade or tower sections at which properties are specified (-)
sec_loc str_tw tw_iner mass_den flp_iner edge_iner flp_stff edge_stff tor_stff axial_stff cg_offst sc_offst tc_offst
(-) (deg) (deg) (kg/m) (kg-m) (kg-m) (Nm^2) (Nm^2) (Nm^2) (N) (m) (m) (m)
0.000000000000000E+00 0.0000 0.0000 1.031484441173360E+04 1.e-6 1.e-6 3.065446681730710E+12 3.065446681730710E+12 1.e+14 1.e+14 0.0 0.0 0.0
1.004745490238510E-01 0.0000 0.0000 1.031484441173360E+04 1.e-6 1.e-6 3.065446681730710E+12 3.065446681730710E+12 1.e+14 1.e+14 0.0 0.0 0.0
1.004822778353140E-01 0.0000 0.0000 9.523818531177400E+03 1.e-6 1.e-6 2.832084716093430E+12 2.832084716093430E+12 1.e+14 1.e+14 0.0 0.0 0.0
2.009490980477020E-01 0.0000 0.0000 9.453084405718950E+03 1.e-6 1.e-6 2.769450452002750E+12 2.769450452002750E+12 1.e+14 1.e+14 0.0 0.0 0.0
2.009568268591660E-01 0.0000 0.0000 8.761306059261840E+03 1.e-6 1.e-6 2.568166429175230E+12 2.568166429175230E+12 1.e+14 1.e+14 0.0 0.0 0.0
3.014236470715530E-01 0.0000 0.0000 8.333524388530640E+03 1.e-6 1.e-6 2.210055981076240E+12 2.210055981076240E+12 1.e+14 1.e+14 0.0 0.0 0.0
3.014313758830170E-01 0.0000 0.0000 7.943339505959190E+03 1.e-6 1.e-6 2.107286870484590E+12 2.107286870484590E+12 1.e+14 1.e+14 0.0 0.0 0.0
4.018981960954040E-01 0.0000 0.0000 7.428459476674180E+03 1.e-6 1.e-6 1.723500010954970E+12 1.723500010954970E+12 1.e+14 1.e+14 0.0 0.0 0.0
4.019059249068680E-01 0.0000 0.0000 7.087214160266680E+03 1.e-6 1.e-6 1.644879215976750E+12 1.644879215976750E+12 1.e+14 1.e+14 0.0 0.0 0.0
5.023727451192560E-01 0.0000 0.0000 6.538098082624470E+03 1.e-6 1.e-6 1.291405296742770E+12 1.291405296742770E+12 1.e+14 1.e+14 0.0 0.0 0.0
5.023804739307190E-01 0.0000 0.0000 6.197174861548130E+03 1.e-6 1.e-6 1.224548874057190E+12 1.224548874057190E+12 1.e+14 1.e+14 0.0 0.0 0.0
6.028472941431070E-01 0.0000 0.0000 5.616516314866140E+03 1.e-6 1.e-6 9.115849751112290E+11 9.115849751112290E+11 1.e+14 1.e+14 0.0 0.0 0.0
6.028550229545700E-01 0.0000 0.0000 5.253477923437150E+03 1.e-6 1.e-6 8.530980440238870E+11 8.530980440238870E+11 1.e+14 1.e+14 0.0 0.0 0.0
7.033218431669580E-01 0.0000 0.0000 4.910275969995680E+03 1.e-6 1.e-6 6.965892589608760E+11 6.965892589608760E+11 1.e+14 1.e+14 0.0 0.0 0.0
7.033295719784210E-01 0.0000 0.0000 4.334167603205980E+03 1.e-6 1.e-6 6.154309947959970E+11 6.154309947959970E+11 1.e+14 1.e+14 0.0 0.0 0.0
8.037963921908090E-01 0.0000 0.0000 4.232816565257490E+03 1.e-6 1.e-6 5.732589718113060E+11 5.732589718113060E+11 1.e+14 1.e+14 0.0 0.0 0.0
8.038041210022720E-01 0.0000 0.0000 3.673387789838780E+03 1.e-6 1.e-6 4.979639354642210E+11 4.979639354642210E+11 1.e+14 1.e+14 0.0 0.0 0.0
9.042709412146600E-01 0.0000 0.0000 3.577282612388080E+03 1.e-6 1.e-6 4.598937820986930E+11 4.598937820986930E+11 1.e+14 1.e+14 0.0 0.0 0.0
9.042786700261230E-01 0.0000 0.0000 4.120141253172980E+03 1.e-6 1.e-6 5.291723868157960E+11 5.291723868157960E+11 1.e+14 1.e+14 0.0 0.0 0.0
1.000000000000000E+00 0.0000 0.0000 4.074837331422720E+03 1.e-6 1.e-6 5.119078821628500E+11 5.119078821628500E+11 1.e+14 1.e+14 0.0 0.0 0.0
Thank you in advance,
Best wishes,