FreeExpansion

class sbpy.dynamics.models.FreeExpansion(**kwargs)

Bases: DynamicalModel

Equation of motion solver for particle motion in free space.

Parameters:

**kwargsdict

Arguments passed on to solve_ivp. Units are seconds, km, and km/s, e.g., max_step is a float value in units of seconds. For relative and absolute tolerance keywords, rtol and atol, 6-element arrays may be used, where the first three elements are for position, and the last three are for velocity.

Methods Summary

df_drv(t, rv, *args)
dx_dt(t, rv, *args)
solve(initial, t_final, *args)	Solve the equations of motion for a single particle.

Methods Documentation

classmethod df_drv(t: float, rv: ndarray, *args) → ndarray

classmethod dx_dt(t: float, rv: ndarray, *args) → ndarray

solve(initial: State, t_final: Time, *args) → State

Solve the equations of motion for a single particle.

The solution is calculated with scipy.integrate.solve_ivp.

Parameters:

initialState

Initial state (position and velocity at time) of the particle.

t_finalTime or Quantity

Time at which the solution is desired. Use of Time versus Quantity must match how time is defined in the initial state.

*args

Additional arguments passed to dx_dt and df_drv.

Returns:

finalState