203 lines
5.2 KiB
Python
203 lines
5.2 KiB
Python
"""
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This file describes the shapes of the wing shells. The joints are defined in
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`__init__.py`.
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"""
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import math
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import cadquery as Cq
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from nhf.parts.joints import HirthJoint
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def wing_root_profiles(
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base_sweep=150,
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wall_thickness=8,
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base_radius=60,
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middle_offset=30,
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conn_width=40,
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conn_height=100) -> tuple[Cq.Wire, Cq.Wire]:
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assert base_sweep < 180
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assert middle_offset > 0
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theta = math.pi * base_sweep / 180
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c, s = math.cos(theta), math.sin(theta)
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c_1, s_1 = math.cos(theta * 0.75), math.sin(theta * 0.75)
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c_2, s_2 = math.cos(theta / 2), math.sin(theta / 2)
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r1 = base_radius
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r2 = base_radius - wall_thickness
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base = (
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Cq.Sketch()
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.arc(
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(c * r1, s * r1),
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(c_1 * r1, s_1 * r1),
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(c_2 * r1, s_2 * r1),
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)
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.arc(
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(c_2 * r1, s_2 * r1),
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(r1, 0),
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(c_2 * r1, -s_2 * r1),
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)
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.arc(
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(c_2 * r1, -s_2 * r1),
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(c_1 * r1, -s_1 * r1),
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(c * r1, -s * r1),
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)
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.segment(
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(c * r1, -s * r1),
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(c * r2, -s * r2),
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)
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.arc(
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(c * r2, -s * r2),
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(c_1 * r2, -s_1 * r2),
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(c_2 * r2, -s_2 * r2),
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)
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.arc(
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(c_2 * r2, -s_2 * r2),
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(r2, 0),
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(c_2 * r2, s_2 * r2),
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)
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.arc(
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(c_2 * r2, s_2 * r2),
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(c_1 * r2, s_1 * r2),
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(c * r2, s * r2),
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)
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.segment(
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(c * r2, s * r2),
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(c * r1, s * r1),
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)
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.assemble(tag="wire")
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.wires().val()
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)
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assert isinstance(base, Cq.Wire)
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# The interior sweep is given by theta, but the exterior sweep exceeds the
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# interior sweep so the wall does not become thinner towards the edges.
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# If the exterior sweep is theta', it has to satisfy
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#
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# sin(theta) * r2 + wall_thickness = sin(theta') * r1
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x, y = conn_width / 2, conn_height / 2
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t = wall_thickness
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dx = middle_offset
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middle = (
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Cq.Sketch()
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# Interior arc, top point
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.arc(
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(x - t, y - t),
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(x - t + dx, 0),
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(x - t, -y + t),
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)
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.segment(
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(x - t, -y + t),
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(-x, -y+t)
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)
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.segment((-x, -y))
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.segment((x, -y))
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# Outer arc, bottom point
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.arc(
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(x, -y),
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(x + dx, 0),
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(x, y),
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)
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.segment(
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(x, y),
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(-x, y)
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)
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.segment((-x, y-t))
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#.segment((x2, a))
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.close()
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.assemble(tag="wire")
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.wires().val()
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)
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assert isinstance(middle, Cq.Wire)
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x, y = conn_width / 2, conn_height / 2
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t = wall_thickness
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tip = (
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Cq.Sketch()
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.segment((-x, y), (x, y))
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.segment((x, -y))
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.segment((-x, -y))
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.segment((-x, -y+t))
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.segment((x-t, -y+t))
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.segment((x-t, y-t))
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.segment((-x, y-t))
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.close()
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.assemble(tag="wire")
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.wires().val()
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)
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return base, middle, tip
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def wing_root(joint: HirthJoint,
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bolt_diam: int = 12):
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"""
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Generate the contiguous components of the root wing segment
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"""
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root_profile, middle_profile, tip_profile = wing_root_profiles()
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rotate_centre = Cq.Vector(-200, 0, -25)
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rotate_axis = Cq.Vector(0, 1, 0)
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terminal_offset = Cq.Vector(-80, 0, 80)
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terminal_rotate = Cq.Vector(0, -45, 0)
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#middle_profile = middle_profile.moved(Cq.Location((0, 0, -100)))
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#tip_profile = tip_profile.moved(Cq.Location((0, 0, -200)))
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middle_profile = middle_profile.rotate(
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startVector=rotate_centre,
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endVector=rotate_centre + rotate_axis,
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angleDegrees = 30,
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)
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antetip_profile = tip_profile.rotate(
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startVector=rotate_centre,
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endVector=rotate_centre + rotate_axis,
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angleDegrees = 60,
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)
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tip_profile = tip_profile.rotate(
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startVector=rotate_centre,
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endVector=rotate_centre + rotate_axis,
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angleDegrees = 90,
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)
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seg1 = (
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Cq.Workplane('XY')
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.add(root_profile)
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.toPending()
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.transformed(
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offset=terminal_offset,
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rotate=terminal_rotate)
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#.add(middle_profile.moved(Cq.Location((-15, 0, 15))))
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.add(middle_profile)
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.toPending()
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.loft()
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)
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seg2 = (
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Cq.Workplane('XY')
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.add(middle_profile)
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.toPending()
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.workplane()
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.add(antetip_profile)
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.toPending()
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.loft()
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)
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seg3 = (
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Cq.Workplane('XY')
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.add(antetip_profile)
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.toPending()
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.workplane()
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.add(tip_profile)
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.toPending()
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.loft()
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)
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result = seg1.union(seg2).union(seg3)
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result.faces("<Z").tag("base")
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result.faces(">X").tag("conn")
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j = (
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joint.generate(is_mated=True)
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.faces("<Z")
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.hole(bolt_diam)
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)
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result = (
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result
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.union(j.translate((0, 0, -10)))
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#.union(Cq.Solid.makeCylinder(57, 5).moved(Cq.Location((0, 0, -10))))
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.union(Cq.Solid.makeCylinder(20, 5).moved(Cq.Location((0, 0, -10))))
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.clean()
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)
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return result
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