50 lines
2.6 KiB
Python
50 lines
2.6 KiB
Python
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import sympy.physics.mechanics as _me
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import sympy as _sm
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import math as m
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import numpy as _np
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frame_a = _me.ReferenceFrame('a')
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c1, c2, c3 = _sm.symbols('c1 c2 c3', real=True)
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a = _me.inertia(frame_a, 1, 1, 1)
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particle_p1 = _me.Particle('p1', _me.Point('p1_pt'), _sm.Symbol('m'))
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particle_p2 = _me.Particle('p2', _me.Point('p2_pt'), _sm.Symbol('m'))
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body_r_cm = _me.Point('r_cm')
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body_r_f = _me.ReferenceFrame('r_f')
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body_r = _me.RigidBody('r', body_r_cm, body_r_f, _sm.symbols('m'), (_me.outer(body_r_f.x,body_r_f.x),body_r_cm))
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frame_a.orient(body_r_f, 'DCM', _sm.Matrix([1,1,1,1,1,0,0,0,1]).reshape(3, 3))
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point_o = _me.Point('o')
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m1 = _sm.symbols('m1')
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particle_p1.mass = m1
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m2 = _sm.symbols('m2')
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particle_p2.mass = m2
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mr = _sm.symbols('mr')
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body_r.mass = mr
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i1 = _sm.symbols('i1')
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i2 = _sm.symbols('i2')
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i3 = _sm.symbols('i3')
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body_r.inertia = (_me.inertia(body_r_f, i1, i2, i3, 0, 0, 0), body_r_cm)
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point_o.set_pos(particle_p1.point, c1*frame_a.x)
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point_o.set_pos(particle_p2.point, c2*frame_a.y)
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point_o.set_pos(body_r_cm, c3*frame_a.z)
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a = _me.inertia_of_point_mass(particle_p1.mass, particle_p1.point.pos_from(point_o), frame_a)
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a = _me.inertia_of_point_mass(particle_p2.mass, particle_p2.point.pos_from(point_o), frame_a)
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a = body_r.inertia[0] + _me.inertia_of_point_mass(body_r.mass, body_r.masscenter.pos_from(point_o), frame_a)
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a = _me.inertia_of_point_mass(particle_p1.mass, particle_p1.point.pos_from(point_o), frame_a) + _me.inertia_of_point_mass(particle_p2.mass, particle_p2.point.pos_from(point_o), frame_a) + body_r.inertia[0] + _me.inertia_of_point_mass(body_r.mass, body_r.masscenter.pos_from(point_o), frame_a)
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a = _me.inertia_of_point_mass(particle_p1.mass, particle_p1.point.pos_from(point_o), frame_a) + body_r.inertia[0] + _me.inertia_of_point_mass(body_r.mass, body_r.masscenter.pos_from(point_o), frame_a)
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a = body_r.inertia[0] + _me.inertia_of_point_mass(body_r.mass, body_r.masscenter.pos_from(point_o), frame_a)
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a = body_r.inertia[0]
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particle_p2.point.set_pos(particle_p1.point, c1*frame_a.x+c2*frame_a.y)
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body_r_cm.set_pos(particle_p1.point, c3*frame_a.x)
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body_r_cm.set_pos(particle_p2.point, c3*frame_a.y)
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b = _me.functions.center_of_mass(point_o,particle_p1, particle_p2, body_r)
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b = _me.functions.center_of_mass(point_o,particle_p1, body_r)
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b = _me.functions.center_of_mass(particle_p1.point,particle_p1, particle_p2, body_r)
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u1, u2, u3 = _me.dynamicsymbols('u1 u2 u3')
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v = u1*frame_a.x+u2*frame_a.y+u3*frame_a.z
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u = (v+c1*frame_a.x).normalize()
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particle_p1.point.set_vel(frame_a, u1*frame_a.x)
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a = particle_p1.point.partial_velocity(frame_a, u1)
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m = particle_p1.mass+body_r.mass
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m = particle_p2.mass
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m = particle_p1.mass+particle_p2.mass+body_r.mass
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