From 8bbc799672b95d71ff80759c0f8bf30bc11f9c19 Mon Sep 17 00:00:00 2001 From: Marius Peter Date: Tue, 11 Jun 2019 13:15:23 -0700 Subject: Final Stringer.add implementation --- creator.py | 105 ++++++++++++++++++++++++++++++++++--------------------------- 1 file changed, 58 insertions(+), 47 deletions(-) (limited to 'creator.py') diff --git a/creator.py b/creator.py index 5ac4c06..c6cae4e 100644 --- a/creator.py +++ b/creator.py @@ -78,19 +78,11 @@ class Coordinates: print('Chord length:', self.chord) print('Semi-span:', self.semi_span) print('============================') - print('x_u the upper x-coordinates:', - np.around(self.x_u, round), - sep='\n') - print('y_u the upper y-coordinates:', - np.around(self.y_u, round), - sep='\n') - print('x_l the lower x-coordinates:', - np.around(self.x_l, round), - sep='\n') - print('y_l the lower y-coordinates:', - np.around(self.y_l, round), - sep='\n') - print('\n') + print('x_u the upper x-coordinates:\n', np.around(self.x_u, round)) + print('y_u the upper y-coordinates:\n', np.around(self.y_u, round)) + print('x_l the lower x-coordinates:\n', np.around(self.x_l, round)) + print('y_l the lower y-coordinates:\n', np.around(self.y_l, round)) + # print('\n') return None def save_coord(self, save_dir_path): @@ -140,7 +132,6 @@ class Airfoil(Coordinates): Parameters: naca_num: 4-digit NACA wing - chord: wing chord length, in any unit Return: None @@ -284,22 +275,23 @@ class Spar(Coordinates): class Stringer(Coordinates): - """Contains the coordinates of stringer(s).""" + """Contains the coordinates of all stringers.""" global parent def __init__(self): super().__init__(parent.chord, parent.semi_span) - def add(self, airfoil_coord, spar_coord, den_u_1, den_u_2, den_l_1, - den_l_2): + def add(self, airfoil_coord, spar_coord, stringer_u_1, stringer_u_2, + stringer_l_1, stringer_l_2): """ - Add stringers to the wing from their density distribution. + Add equally distributed stringers to four airfoil locations + (upper nose, lower nose, upper surface, lower surface). Parameters: - den_u_1: upper nose stringer density (until first spar) - den_u_2: upper surface stringer density - den_l_1: lower nose stringer density (until first spar) - den_l_2: lower surface stringer density + stringer_u_1: upper nose number of stringers + stringer_u_2: upper surface number of stringers + stringer_l_1: lower nose number of stringers + stringer_l_2: lower surface number of stringers Returns: None @@ -311,39 +303,51 @@ class Stringer(Coordinates): airfoil_y_u = airfoil_coord[1] airfoil_x_l = airfoil_coord[2] airfoil_y_l = airfoil_coord[3] - # Spar coordinates # unpacked from 'coordinates' (list of lists in 'Coordinates'). - spar_x_u = spar_coord[0] - spar_y_u = spar_coord[1] - spar_x_l = spar_coord[2] - spar_y_l = spar_coord[3] - - # Find distance between leading edge and first upper stringer, - # from density parameter den_u_1. - interval = den_u_1 * spar_x_u[0] - # initialise first self.stringer_x_u at first interval. + try: + spar_x_u = spar_coord[0] + spar_y_u = spar_coord[1] + spar_x_l = spar_coord[2] + spar_y_l = spar_coord[3] + except: + print('Unable to initialize stringers. Were spars created?') + # Find distance between leading edge and first upper stringer + interval = spar_x_u[0] / (stringer_u_1 + 1) + # initialise first self.stringer_x_u at first interval x = interval - # Add upper stringers until first spar. - while x < spar_x_u[0]: + # Add upper stringers from leading edge until first spar. + for _ in range(0, stringer_u_1): # Index of the first value of airfoil_x_u > x index = bi.bisect_left(airfoil_x_u, x) - # Append the value of airfoil_x_u at index to stringer's coordinates + self.x_u.append(airfoil_x_u[index]) + self.y_u.append(airfoil_y_u[index]) + x += interval + # Add upper stringers from first spar until last spar + interval = (spar_x_u[-1] - spar_x_u[0]) / (stringer_u_2 + 1) + x = interval + spar_x_u[0] + for _ in range(0, stringer_u_2): + index = bi.bisect_left(airfoil_x_u, x) self.x_u.append(airfoil_x_u[index]) self.y_u.append(airfoil_y_u[index]) x += interval - # Find interval between leading edge and first lower stringer, - # from density parameter den_l_1. - interval = den_l_1 * spar_x_u[0] - # initialise first self.stringer_x_l at first interval. + # Find distance between leading edge and first lower stringer + interval = spar_x_l[0] / (stringer_l_1 + 1) x = interval - # Add lower stringers until first spar. - while x < spar_x_l[0]: - # Index of the first value of self.x_l > x + # Add lower stringers from leading edge until first spar. + for _ in range(0, stringer_l_1): index = bi.bisect_left(airfoil_x_l, x) - self.x_u.append(airfoil_x_u[index]) - self.y_u.append(airfoil_y_u[index]) + self.x_l.append(airfoil_x_l[index]) + self.y_l.append(airfoil_y_l[index]) + x += interval + # Add lower stringers from first spar until last spar + interval = (spar_x_l[-1] - spar_x_l[0]) / (stringer_l_2 + 1) + x = interval + spar_x_l[0] + for _ in range(0, stringer_l_2): + index = bi.bisect_left(airfoil_x_l, x) + self.x_l.append(airfoil_x_l[index]) + self.y_l.append(airfoil_y_l[index]) x += interval super().pack_coord() @@ -375,16 +379,23 @@ def plot(airfoil, spar, stringer): for _ in range(0, len(spar.x_u)): x = (spar.x_u[_], spar.x_l[_]) y = (spar.y_u[_], spar.y_l[_]) - plt.plot(x, y, '.-', color='b', label='spar') + plt.plot(x, y, '.-', color='b') plt.legend() except: print('Did not plot spars. Were they added?') # Plot stringers try: + # Upper stringers for _ in range(0, len(stringer.x_u)): - x = (spar.x_u[_], spar.x_l[_]) - y = (spar.y_u[_], spar.y_l[_]) + x = stringer.x_u[_] + y = stringer.y_u[_] + plt.plot(x, y, '.', color='y') + # Lower stringers + for _ in range(0, len(stringer.x_l)): + x = stringer.x_l[_] + y = stringer.y_l[_] + plt.plot(x, y, '.', color='y') except: print('Unable to plot stringers. Were they created?') -- cgit v1.2.3