o o ha@sZddlmZddlmZmZddlmZddlmZddl m Z dgZ GdddeZ dS) )S)crossdot)BodyBase)inertia_of_point_mass)sympy_deprecation_warningParticlecsPeZdZdZejZdfdd ZddZddZ d d Z d d Z d dZ Z S)ranA particle. Explanation =========== Particles have a non-zero mass and lack spatial extension; they take up no space. Values need to be supplied on initialization, but can be changed later. Parameters ========== name : str Name of particle point : Point A physics/mechanics Point which represents the position, velocity, and acceleration of this Particle mass : Sympifyable A SymPy expression representing the Particle's mass potential_energy : Sympifyable The potential energy of the Particle. Examples ======== >>> from sympy.physics.mechanics import Particle, Point >>> from sympy import Symbol >>> po = Point('po') >>> m = Symbol('m') >>> pa = Particle('pa', po, m) >>> # Or you could change these later >>> pa.mass = m >>> pa.point = po Ncst|||dS)N)super__init__)selfnamepointmass __class__t/var/www/html/construction_image-detection-poc/venv/lib/python3.10/site-packages/sympy/physics/mechanics/particle.pyr 1szParticle.__init__cCs|j|j|S)aLinear momentum of the particle. Explanation =========== The linear momentum L, of a particle P, with respect to frame N is given by: L = m * v where m is the mass of the particle, and v is the velocity of the particle in the frame N. Parameters ========== frame : ReferenceFrame The frame in which linear momentum is desired. Examples ======== >>> from sympy.physics.mechanics import Particle, Point, ReferenceFrame >>> from sympy.physics.mechanics import dynamicsymbols >>> from sympy.physics.vector import init_vprinting >>> init_vprinting(pretty_print=False) >>> m, v = dynamicsymbols('m v') >>> N = ReferenceFrame('N') >>> P = Point('P') >>> A = Particle('A', P, m) >>> P.set_vel(N, v * N.x) >>> A.linear_momentum(N) m*v*N.x )rr velr framerrrlinear_momentum4s%zParticle.linear_momentumcCs t|j||j|j|S)aAngular momentum of the particle about the point. Explanation =========== The angular momentum H, about some point O of a particle, P, is given by: ``H = cross(r, m * v)`` where r is the position vector from point O to the particle P, m is the mass of the particle, and v is the velocity of the particle in the inertial frame, N. Parameters ========== point : Point The point about which angular momentum of the particle is desired. frame : ReferenceFrame The frame in which angular momentum is desired. Examples ======== >>> from sympy.physics.mechanics import Particle, Point, ReferenceFrame >>> from sympy.physics.mechanics import dynamicsymbols >>> from sympy.physics.vector import init_vprinting >>> init_vprinting(pretty_print=False) >>> m, v, r = dynamicsymbols('m v r') >>> N = ReferenceFrame('N') >>> O = Point('O') >>> A = O.locatenew('A', r * N.x) >>> P = Particle('P', A, m) >>> P.point.set_vel(N, v * N.y) >>> P.angular_momentum(O, N) m*r*v*N.z )rr pos_fromrrr r rrrrangular_momentum[s *zParticle.angular_momentumcCs&tj|jt|j||j|S)aKinetic energy of the particle. Explanation =========== The kinetic energy, T, of a particle, P, is given by: ``T = 1/2 (dot(m * v, v))`` where m is the mass of particle P, and v is the velocity of the particle in the supplied ReferenceFrame. Parameters ========== frame : ReferenceFrame The Particle's velocity is typically defined with respect to an inertial frame but any relevant frame in which the velocity is known can be supplied. Examples ======== >>> from sympy.physics.mechanics import Particle, Point, ReferenceFrame >>> from sympy import symbols >>> m, v, r = symbols('m v r') >>> N = ReferenceFrame('N') >>> O = Point('O') >>> P = Particle('P', O, m) >>> P.point.set_vel(N, v * N.y) >>> P.kinetic_energy(N) m*v**2/2 )rHalfrrr rrrrrkinetic_energys$ zParticle.kinetic_energycCstdddd||_dS)Nz The sympy.physics.mechanics.Particle.set_potential_energy() method is deprecated. Instead use P.potential_energy = scalar z1.5zdeprecated-set-potential-energy)deprecated_since_versionactive_deprecations_target)rpotential_energy)r scalarrrrset_potential_energys  zParticle.set_potential_energycCst|j|j||S)aReturns an inertia dyadic of the particle with respect to another point and frame. Parameters ========== point : sympy.physics.vector.Point The point to express the inertia dyadic about. frame : sympy.physics.vector.ReferenceFrame The reference frame used to construct the dyadic. Returns ======= inertia : sympy.physics.vector.Dyadic The inertia dyadic of the particle expressed about the provided point and frame. )rrr rrrrr parallel_axisszParticle.parallel_axis)NN)__name__ __module__ __qualname____doc__r masscenterr r rrrr r! __classcell__rrrrr s$'-' N) sympyrsympy.physics.vectorrr!sympy.physics.mechanics.body_basersympy.physics.mechanics.inertiarsympy.utilities.exceptionsr__all__rrrrrs