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Update strain_optimization.py #384

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Dec 17, 2023
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Update strain_optimization.py #384

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12 changes: 7 additions & 5 deletions examples/2_Intermediate/strain_optimization.py
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Expand Up @@ -9,12 +9,14 @@
86 (2020), doi:10.1017/S0022377820001208.

The orientation of the tape is defined with respect to the Frenet-Serret Frame

Authors: Paul Huslage, Elizabeth Paul
"""

import numpy as np
from scipy.optimize import minimize
from simsopt.geo import CoilStrain, LPTorsionalStrainPenalty, LPBinormalCurvatureStrainPenalty
from simsopt.geo import FrameRotation, FramedCurveFrenet, CurveXYZFourier
from simsopt.geo import FrameRotation, FramedCurveCentroid, CurveXYZFourier
from simsopt.configs import get_hsx_data
from simsopt.util import in_github_actions

Expand All @@ -26,15 +28,15 @@
curve_scaled = CurveXYZFourier(curve.quadpoints, curve.order)
curve_scaled.x = curve.x * scale_factor # scale coil to magnify the strains
rot_order = 10 # order of the Fourier expression for the rotation of the filament pack
width = 1e-3 # tape width
width = 3e-3 # tape width

curve_scaled.fix_all() # fix curve DOFs -> only optimize winding angle
rotation = FrameRotation(curve_scaled.quadpoints, rot_order)

framedcurve = FramedCurveFrenet(curve_scaled, rotation)
framedcurve = FramedCurveCentroid(curve_scaled, rotation)

tor_threshold = 0.02 # Threshold for strain parameters
cur_threshold = 0.02
tor_threshold = 0.002 # Threshold for strain parameters
cur_threshold = 0.002

Jtor = LPTorsionalStrainPenalty(framedcurve, p=2, threshold=tor_threshold)
Jbin = LPBinormalCurvatureStrainPenalty(
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