evaluator.Airfoil class & class methods

1 files changed, 120 insertions, 51 deletions

diff --git a/evaluator.py b/evaluator.py
index 2b61348..6965895 100644
--- a/evaluator.py
+++ b/evaluator.py
@@ -13,60 +13,129 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
+import sys
+import os.path
+import numpy as np
 from math import sin, cos, atan, sqrt
 
 
-def get_total_mass(*component):
-    total_mass = float()
-    for _ in component:
-        total_mass += _.mass
-    return total_mass
+class Airfoil:
+    '''Performs structural evaluations for the airfoil passed as argument.'''
+
+    def __init__(self, airfoil):
+        self.airfoil = airfoil
+        # Global dimensions
+        self.chord = airfoil.chord
+        self.semi_span = airfoil.semi_span
+        # mass and area
+        self.mass_total = float()
+        self.mass_dist = []
+
+        self.lift_rectangular = []
+        self.lift_elliptical = []
+        self.lift = []
+
+        self.drag = []
+
+    def __str__(self):
+        return type(self).__name__
+
+    def print_info(self, round):
+        """
+        Print all the component's evaluated data to the terminal.
+
+        This function's output is piped to the 'save_data' function below.
+        """
+        print('============================')
+        print('       EVALUATOR DATA       ')
+        print('Evaluating:', str(self.airfoil))
+        print('Chord length:', self.chord)
+        print('Semi-span:', self.semi_span)
+        print('Total airfoil mass:', self.mass_total)
+        print('============================')
+        print('Rectangular lift:\n', np.around(self.lift_rectangular, round))
+        print('Elliptical lift:\n', np.around(self.lift_elliptical, round))
+        print('Combined lift:\n', np.around(self.lift, round))
+        print('Distribution of mass:\n', np.around(self.mass_dist, round))
+        print('Drag:\n', np.around(self.drag, round))
+        return None
+
+    def save_info(self, save_dir_path, number):
+        """
+        Save all the object's coordinates (must be full path).
+        """
+
+        file_name = '{}_{}.txt'.format(self, number)
+        full_path = os.path.join(save_dir_path, file_name)
+        try:
+            with open(full_path, 'w') as sys.stdout:
+                self.print_info(2)
+                # This line required to reset behavior of sys.stdout
+                sys.stdout = sys.__stdout__
+                print('Successfully wrote to file {}'.format(full_path))
+        except IOError:
+            print('Unable to write {} to specified directory.\n'
+                  .format(file_name),
+                  'Was the full path passed to the function?')
+        return None
+
+    def get_mass_total(airfoil):
+        total_mass = airfoil.mass + airfoil.spar.mass + airfoil.stringer.mass
+        return total_mass
+
+    # All these functions take integer arguments and return lists.
+
+    def get_lift_rectangular(airfoil, lift):
+        L_prime = [lift / (airfoil.semi_span * 2)
+                   for x in range(airfoil.semi_span)]
+        return L_prime
+
+    def get_lift_elliptical(airfoil, L_0):
+        L_prime = [L_0 * sqrt(1 - (y / airfoil.semi_span) ** 2)
+                   for y in range(airfoil.semi_span)]
+        return L_prime
+
+    def get_lift(rectangular, elliptical):
+        F_z = [(rectangular[_] + elliptical[_]) / 2
+               for _ in range(len(rectangular))]
+        return F_z
+
+    def get_mass_distribution(airfoil, total_mass):
+        F_z = [total_mass / airfoil.semi_span
+               for x in range(0, airfoil.semi_span)]
+        return F_z
+
+    def get_drag(airfoil, drag):
+        # Transform semi-span integer into list
+        semi_span = [x for x in range(0, airfoil.semi_span)]
+
+        # Drag increases after 80% of the semi_span
+        cutoff = round(0.8 * airfoil.semi_span)
+
+        # Drag increases by 25% after 80% of the semi_span
+        F_x = [drag for x in semi_span[0:cutoff]]
+        F_x.extend([1.25 * drag for x in semi_span[cutoff:]])
+        return F_x
+
+    def evaluate(self):
+        self.drag = self.get_drag(self.airfoil, 10)
+
+        self.lift_rectangular = self.get_lift_rectangular(10)
+        self.lift_elliptical = self.get_lift_elliptical(15)
+        self.lift = self.get_lift(self.lift_rectangular, self.lift_elliptical)
+
+        self.mass_total = self.get_mass_total()
+        self.mass_dist = self.get_mass_distribution(self.total_mass)
+        return None
+
+# def get_centroid(airfoil):
+#     area = airfoil.stringer.area
+#     top_stringers = airfoil.stringer
+#     bottom_stringers =
+#     nose_top_stringers =
+#     nose_bottom_stringers =
+#     for _ in airfoil.stringer[1]:
+#         centroid.x +=
 
-
-# All these functions take integer arguments and return lists.
-
-def get_lift_rectangular(airfoil, lift):
-    L_prime = [lift / (airfoil.semi_span * 2)
-               for x in range(airfoil.semi_span)]
-    return L_prime
-
-
-def get_lift_elliptical(airfoil, L_0):
-    L_prime = [L_0 * sqrt(1 - (y / airfoil.semi_span) ** 2)
-               for y in range(airfoil.semi_span)]
-    return L_prime
-
-
-def get_lift(rectangular, elliptical):
-    F_z = [(rectangular[_] + elliptical[_]) / 2
-           for _ in range(len(rectangular))]
-    return F_z
-
-
-def get_mass_distribution(airfoil, total_mass):
-    F_z = [total_mass / airfoil.semi_span
-           for x in range(0, airfoil.semi_span)]
-    return F_z
-
-
-def get_drag(airfoil, drag):
-    # Transform semi-span integer into list
-    semi_span = [x for x in range(0, airfoil.semi_span)]
-    cutoff = round(0.8 * airfoil.semi_span)
-
-    F_x = [drag for x in semi_span[0:cutoff]]
-    F_x.extend([1.25 * drag for x in semi_span[cutoff:]])
-    # for x in semi_span[cutoff:]:
-    #     drag_distribution.append(1.25 * drag)
-    return F_x
-
-
-def get_centroid(airfoil):
-    area = airfoil.stringer.area
-    numerator = float()
-    for _ in airfoil.stringer.x_u:
-        numerator += _ * area
-    for _ in airfoil.stringer.x_l:
-        numerator += _ * area
     # denominator
     # z_c =