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Fix Example 12 #158

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Dec 20, 2021
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Fix Example 12 #158

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9 changes: 4 additions & 5 deletions weis/aeroelasticse/LinearFAST.py
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Original file line number Diff line number Diff line change
Expand Up @@ -139,17 +139,16 @@ def gen_linear_cases(self,inputs={}):
else: # if using fst_vt inputs from openfast_openmdao
rosco_inputs = self.fst_vt['DISCON_in']

# TODO: check this in below rated wind_speeds
k_opt = rosco_inputs['VS_Rgn2K']/ (30 / np.pi)**2 # openfast units
omega_rated_rpm = rosco_inputs['PC_RefSpd'] * 30 / np.pi * .9 # rpm, include slip percent
omega_rated_rpm = rosco_inputs['PC_RefSpd'] * 30 / np.pi * 0.9 # rpm, offset so torque not active above rated, someday do a pseudo setpoint-smoother here

if k_opt * omega_rated_rpm ** 2 > rosco_inputs['VS_RtTq']:
print('LinearFAST WARNING: need to rescale VS_Rgn2K to be legal in openfast')
k_opt = rosco_inputs['VS_RtTq'] / omega_rated_rpm ** 2
k_opt = 0.99 * rosco_inputs['VS_RtTq'] / omega_rated_rpm ** 2 # include slight reduction in k_opt so it always works

case_inputs[("ServoDyn","VS_RtGnSp")] = {'vals':[omega_rated_rpm], 'group':0} # convert to rpm and use 95% of rated
case_inputs[("ServoDyn","VS_RtGnSp")] = {'vals':[omega_rated_rpm], 'group':0}
case_inputs[("ServoDyn","VS_RtTq")] = {'vals':[rosco_inputs['VS_RtTq']], 'group':0}
case_inputs[("ServoDyn","VS_Rgn2K")] = {'vals':[k_opt] , 'group':0} # reduce so k\omega^2 < VS_RtTq
case_inputs[("ServoDyn","VS_Rgn2K")] = {'vals':[k_opt] , 'group':0}
case_inputs[("ServoDyn","VS_SlPc")] = {'vals':[10.], 'group':0}

# set initial pitch to fine pitch
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