25 lines
561 B
Python
25 lines
561 B
Python
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import sympy as sm
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import sympy.physics.mechanics as me
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me.init_vprinting()
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m1, m2, m3, m4 = sm.symbols('m1, m2, m3, m4')
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N = me.ReferenceFrame('N')
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r1 = 3*N.x + 4*N.y
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r2 = 3*N.y + 4*N.z
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r3 = 4*N.x + 4*N.z
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r4 = 3*N.y + 4*N.z
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first_moment = m1*r1 + m2*r2 + m3*r3 + m4*r4
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zeroth_moment = m1 + m2 + m3 + m4
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mass_center = first_moment / zeroth_moment
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print(mass_center)
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Ix = (m1 * me.cross(r1, me.cross(N.x, r1))
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+ m2 * me.cross(r2, me.cross(N.x, r2))
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+ m3 * me.cross(r3, me.cross(N.x, r3))
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+ m4 * me.cross(r4, me.cross(N.x, r4)))
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print(Ix)
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