pyyeti.ode.SolveNewmark.tsolve

SolveNewmark.tsolve(force, d0=None, v0=None)[source]

Solve time-domain 2nd order ODE equations

Parameters:

  • force (2d ndarray) – The force matrix; ndof x time

  • d0 (1d ndarray; optional) – Displacement initial conditions; if None, zero ic’s are used.

  • v0 (1d ndarray; optional) – Velocity initial conditions; if None, zero ic’s are used.

Returns:

  • A record (SimpleNamespace class) with the members

  • d (2d ndarray) – Displacement; ndof x time

  • v (2d ndarray) – Velocity; ndof x time

  • a (2d ndarray) – Acceleration; ndof x time

  • h (scalar) – Time-step

  • t (1d ndarray) – Time vector: np.arange(d.shape[1])*h

  • z (dictionary of 2d ndarrays; optional) – Only present if there are nonlinear force terms. The dictionary keys correspond to the keys used to define the nonlinear force terms in def_nonlin(). The values are the output of the functions that defined these force terms (see def_nonlin()).