\h tSSKJr SSKJrJrJrJr SSKJr /SQr S Sjr Sr "SS\"SS S /55r g ) )sympify)PointDyadicReferenceFrameouter) namedtuple)inertiainertia_of_point_massInertiacH[U[5(d [S5e[U5[U5[U5p2n[U5[U5[U5penU[ UR UR 5-U[ UR UR 5--U[ UR UR5--U[ UR UR 5--U[ UR UR 5--U[ UR UR5--U[ URUR 5--U[ URUR 5--U[ URUR5--$)aSimple way to create inertia Dyadic object. Explanation =========== Creates an inertia Dyadic based on the given tensor values and a body-fixed reference frame. Parameters ========== frame : ReferenceFrame The frame the inertia is defined in. ixx : Sympifyable The xx element in the inertia dyadic. iyy : Sympifyable The yy element in the inertia dyadic. izz : Sympifyable The zz element in the inertia dyadic. ixy : Sympifyable The xy element in the inertia dyadic. iyz : Sympifyable The yz element in the inertia dyadic. izx : Sympifyable The zx element in the inertia dyadic. Examples ======== >>> from sympy.physics.mechanics import ReferenceFrame, inertia >>> N = ReferenceFrame('N') >>> inertia(N, 1, 2, 3) (N.x|N.x) + 2*(N.y|N.y) + 3*(N.z|N.z) z%Need to define the inertia in a frame) isinstancer TypeErrorrrxyz)frameixxiyyizzixyiyzizxs W/var/www/auris/envauris/lib/python3.13/site-packages/sympy/physics/mechanics/inertia.pyr r sNJ e^ , ,?@@CL'#, cCCL'#, cC egguww' '#eEGGUWW.E*E E egguww' ' (*-eEGGUWW.E*E F egguww' ' (*-eEGGUWW.E*E F egguww' ' (+.eEGGUWW.E*E F egguww' '  ()cU[URUR5[URUR5-[URUR5-UR U5-[X5- -$)aInertia dyadic of a point mass relative to point O. Parameters ========== mass : Sympifyable Mass of the point mass pos_vec : Vector Position from point O to point mass frame : ReferenceFrame Reference frame to express the dyadic in Examples ======== >>> from sympy import symbols >>> from sympy.physics.mechanics import ReferenceFrame, inertia_of_point_mass >>> N = ReferenceFrame('N') >>> r, m = symbols('r m') >>> px = r * N.x >>> inertia_of_point_mass(m, px, N) m*r**2*(N.y|N.y) + m*r**2*(N.z|N.z) )rrrrdot)masspos_vecrs rr r 8ss4  uww uww  ! uww  ! W  "'w!8 9 ::rc\^\rSrSrSrSrU4Sjr\SSj5rSr Sr \ r \ r Sr U=r$) r YaInertia object consisting of a Dyadic and a Point of reference. Explanation =========== This is a simple class to store the Point and Dyadic, belonging to an inertia. Attributes ========== dyadic : Dyadic The dyadic of the inertia. point : Point The reference point of the inertia. Examples ======== >>> from sympy.physics.mechanics import ReferenceFrame, Point, Inertia >>> N = ReferenceFrame('N') >>> Po = Point('Po') >>> Inertia(N.x.outer(N.x) + N.y.outer(N.y) + N.z.outer(N.z), Po) ((N.x|N.x) + (N.y|N.y) + (N.z|N.z), Po) In the example above the Dyadic was created manually, one can however also use the ``inertia`` function for this or the class method ``from_tensor`` as shown below. >>> Inertia.from_inertia_scalars(Po, N, 1, 1, 1) ((N.x|N.x) + (N.y|N.y) + (N.z|N.z), Po) c>[U[5(a[U[5(aXp[U[5(d [S5e[U[5(d [S5e[TU]XU5$)Nz'Reference point should be of type Pointz-Inertia value should be expressed as a Dyadic)r rrrsuper__new__)clsdyadicpoint __class__s rr$Inertia.__new__}sd fe $ $E6)B)B"6%''EF F&&))KL LwsE22rc ,U"[X#XEXgU5U5$)aSimple way to create an Inertia object based on the tensor values. Explanation =========== This class method uses the :func`~.inertia` to create the Dyadic based on the tensor values. Parameters ========== point : Point The reference point of the inertia. frame : ReferenceFrame The frame the inertia is defined in. ixx : Sympifyable The xx element in the inertia dyadic. iyy : Sympifyable The yy element in the inertia dyadic. izz : Sympifyable The zz element in the inertia dyadic. ixy : Sympifyable The xy element in the inertia dyadic. iyz : Sympifyable The yz element in the inertia dyadic. izx : Sympifyable The zx element in the inertia dyadic. Examples ======== >>> from sympy import symbols >>> from sympy.physics.mechanics import ReferenceFrame, Point, Inertia >>> ixx, iyy, izz, ixy, iyz, izx = symbols('ixx iyy izz ixy iyz izx') >>> N = ReferenceFrame('N') >>> P = Point('P') >>> I = Inertia.from_inertia_scalars(P, N, ixx, iyy, izz, ixy, iyz, izx) The tensor values can easily be seen when converting the dyadic to a matrix. >>> I.dyadic.to_matrix(N) Matrix([ [ixx, ixy, izx], [ixy, iyy, iyz], [izx, iyz, izz]]) )r ) r%r'rrrrrrrs rfrom_inertia_scalarsInertia.from_inertia_scalarssf75s3?GGrcv[SURRSURRS35e)Nz$unsupported operand type(s) for +: '' and ''rr(__name__selfothers r__add__Inertia.__add__@ NN3345!OO445Q89 9rcv[SURRSURRS35e)Nz$unsupported operand type(s) for *: 'r.r/r0r2s r__mul__Inertia.__mul__r7rrrr)r1 __module__ __qualname____firstlineno____doc__ __slots__r$ classmethodr+r5r9__radd____rmul____static_attributes__ __classcell__)r(s@rr r YsH BI3JK!"2H2Hh9 9 HHrr r&r'Nr;) sympyrsympy.physics.vectorrrrr collectionsr__all__r r r r!rrrJs<EE" 9-)`:BnjXw$78nr