How to use the dymos.examples.brachistochrone.brachistochrone_ode.BrachistochroneODE function in dymos

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OpenMDAO / dymos / dymos / examples / brachistochrone / doc / test_doc_brachistochrone_tandem_phases.py View on Github

phase0.add_state('x', rate_source=BrachistochroneODE.states['x']['rate_source'],
                         units=BrachistochroneODE.states['x']['units'],
                         fix_initial=True, fix_final=False, solve_segments=False)

        phase0.add_state('y', rate_source=BrachistochroneODE.states['y']['rate_source'],
                         units=BrachistochroneODE.states['y']['units'],
                         fix_initial=True, fix_final=False, solve_segments=False)

        phase0.add_state('v', rate_source=BrachistochroneODE.states['v']['rate_source'],
                         targets=BrachistochroneODE.states['v']['targets'],
                         units=BrachistochroneODE.states['v']['units'],
                         fix_initial=True, fix_final=False, solve_segments=False)

        phase0.add_control('theta', continuity=True, rate_continuity=True,
                           targets=BrachistochroneODE.parameters['theta']['targets'],
                           units='deg', lower=0.01, upper=179.9)

        phase0.add_input_parameter('g', targets=BrachistochroneODE.parameters['g']['targets'],
                                   units='m/s**2', val=9.80665)

        phase0.add_boundary_constraint('x', loc='final', equals=10)
        phase0.add_boundary_constraint('y', loc='final', equals=5)

        # Add alternative timeseries output to provide control inputs for the next phase
        phase0.add_timeseries('timeseries2', transcription=tx1, subset='control_input')

        #
        # Second Phase: Integration of ArcLength
        #

        phase1 = dm.Phase(ode_class=BrachistochroneArclengthODE, transcription=tx1)

OpenMDAO / dymos / dymos / examples / brachistochrone / doc / test_doc_brachistochrone_tandem_phases.py View on Github

#
        # First Phase: Standard Brachistochrone
        #
        num_segments = 10
        transcription_order = 3
        compressed = False

        tx0 = dm.GaussLobatto(num_segments=num_segments,
                              order=transcription_order,
                              compressed=compressed)

        tx1 = dm.Radau(num_segments=num_segments*2,
                       order=transcription_order*3,
                       compressed=compressed)

        phase0 = dm.Phase(ode_class=BrachistochroneODE, transcription=tx0)

        p.model.add_subsystem('phase0', phase0)

        phase0.set_time_options(fix_initial=True, duration_bounds=(.5, 10))

        phase0.add_state('x', rate_source=BrachistochroneODE.states['x']['rate_source'],
                         units=BrachistochroneODE.states['x']['units'],
                         fix_initial=True, fix_final=False, solve_segments=False)

        phase0.add_state('y', rate_source=BrachistochroneODE.states['y']['rate_source'],
                         units=BrachistochroneODE.states['y']['units'],
                         fix_initial=True, fix_final=False, solve_segments=False)

        phase0.add_state('v', rate_source=BrachistochroneODE.states['v']['rate_source'],
                         targets=BrachistochroneODE.states['v']['targets'],
                         units=BrachistochroneODE.states['v']['units'],

OpenMDAO / dymos / dymos / glm / ozone / utils / test_utils.py View on Github

def test_partials(self, glm_formulation, glm_integrator):
        p = Problem(model=Group())
        phase = Phase('glm',
                      ode_class=BrachistochroneODE,
                      num_segments=2,
                      formulation=glm_formulation,
                      method_name=glm_integrator,
                      compressed=False)
        p.model.add_subsystem('phase0', phase)

        phase.add_control('theta', units='deg', dynamic=True,
                          rate_continuity=None, lower=0.01, upper=179.9)

        p.setup(force_alloc_complex=True)
        p.final_setup()

        p['phase0.t_initial'] = 0.0
        p['phase0.t_duration'] = 2.0
        phase.set_values('x', [0, 10])
        phase.set_values('y', [10, 5])

OpenMDAO / dymos / dymos / examples / brachistochrone / doc / test_doc_brachistochrone_tandem_phases.py View on Github

phase0 = dm.Phase(ode_class=BrachistochroneODE, transcription=tx0)

        p.model.add_subsystem('phase0', phase0)

        phase0.set_time_options(fix_initial=True, duration_bounds=(.5, 10))

        phase0.add_state('x', rate_source=BrachistochroneODE.states['x']['rate_source'],
                         units=BrachistochroneODE.states['x']['units'],
                         fix_initial=True, fix_final=False, solve_segments=False)

        phase0.add_state('y', rate_source=BrachistochroneODE.states['y']['rate_source'],
                         units=BrachistochroneODE.states['y']['units'],
                         fix_initial=True, fix_final=False, solve_segments=False)

        phase0.add_state('v', rate_source=BrachistochroneODE.states['v']['rate_source'],
                         targets=BrachistochroneODE.states['v']['targets'],
                         units=BrachistochroneODE.states['v']['units'],
                         fix_initial=True, fix_final=False, solve_segments=False)

        phase0.add_control('theta', continuity=True, rate_continuity=True,
                           targets=BrachistochroneODE.parameters['theta']['targets'],
                           units='deg', lower=0.01, upper=179.9)

        phase0.add_input_parameter('g', targets=BrachistochroneODE.parameters['g']['targets'],
                                   units='m/s**2', val=9.80665)

        phase0.add_boundary_constraint('x', loc='final', equals=10)
        phase0.add_boundary_constraint('y', loc='final', equals=5)

        # Add alternative timeseries output to provide control inputs for the next phase
        phase0.add_timeseries('timeseries2', transcription=tx1, subset='control_input')

OpenMDAO / dymos / dymos / examples / brachistochrone / ex_brachistochrone.py View on Github

p.driver.options['dynamic_simul_derivs'] = True

    if transcription == 'gauss-lobatto':
        t = GaussLobatto(num_segments=num_segments,
                         order=transcription_order,
                         compressed=compressed)
    elif transcription == 'radau-ps':
        t = Radau(num_segments=num_segments,
                  order=transcription_order,
                  compressed=compressed)
    elif transcription == 'runge-kutta':
        t = RungeKutta(num_segments=num_segments,
                       order=transcription_order,
                       compressed=compressed)

    phase = Phase(ode_class=BrachistochroneODE, transcription=t)

    p.model.add_subsystem('phase0', phase)

    phase.set_time_options(fix_initial=True, duration_bounds=(.5, 10))

    phase.set_state_options('x', fix_initial=True, fix_final=False, solve_segments=False)
    phase.set_state_options('y', fix_initial=True, fix_final=False, solve_segments=False)
    phase.set_state_options('v', fix_initial=True, fix_final=False, solve_segments=False)

    phase.add_control('theta', continuity=True, rate_continuity=True,
                      units='deg', lower=0.01, upper=179.9)

    phase.add_input_parameter('g', units='m/s**2', val=9.80665)

    phase.add_boundary_constraint('x', loc='final', equals=10)
    phase.add_boundary_constraint('y', loc='final', equals=5)

OpenMDAO / dymos / dymos / examples / run_temp_for_glm_integration.py View on Github

p.driver.options['optimizer'] = OPTIMIZER
        p.driver.opt_settings['Major iterations limit'] = 100
        p.driver.opt_settings['iSumm'] = 6
        # p.driver.opt_settings['Verify level'] = 3
    else:
        p.driver = ScipyOptimizeDriver()

    transcription = 'glm'
    formulation = 'optimizer-based'
    formulation = 'solver-based'
    formulation = 'time-marching'
    method_name = 'GaussLegendre6'
    method_name = 'ImplicitMidpoint'
    method_name = 'Lobatto4'
    phase = Phase(transcription,
                  ode_class=BrachistochroneODE,
                  num_segments=10,
                  formulation=formulation,
                  method_name=method_name)

    p.model.add_subsystem('phase0', phase)

    phase.set_time_options(initial_bounds=(0, 0), duration_bounds=(.5, 10))

    if 0:
        phase.set_state_options('x', fix_initial=True, fix_final=True)
        phase.set_state_options('y', fix_initial=True, fix_final=True)
        phase.set_state_options('v', fix_initial=True)
    else:
        phase.add_boundary_constraint('x', loc='initial', equals=0.)
        phase.add_boundary_constraint('x', loc='final', equals=10.)
        phase.add_boundary_constraint('y', loc='initial', equals=10.)

OpenMDAO / dymos / dymos / docs / feature_reference / transcriptions / figures / radau-pseudospectral / plot_radau-pseudospectral.py View on Github

import numpy as np

import matplotlib
matplotlib.use('Agg')
import matplotlib.pyplot as plt

import openmdao.api as om
import dymos as dm
from dymos.examples.brachistochrone.brachistochrone_ode import BrachistochroneODE

p = om.Problem(model=om.Group())
phase = dm.Phase(ode_class=BrachistochroneODE,
                 transcription=dm.Radau(num_segments=4, order=[3, 5, 3, 5]))
p.model.add_subsystem('phase0', phase)

p.setup()
p['phase0.t_initial'] = 1.0
p['phase0.t_duration'] = 9.0
p.run_model()

grid_data = phase.options['transcription'].grid_data

t_all = p.get_val('phase0.timeseries.time')
t_disc = t_all[grid_data.subset_node_indices['state_disc'], 0]
t_col = t_all[grid_data.subset_node_indices['col'], 0]


def f(x):  # pragma: no cover

OpenMDAO / dymos / dymos / examples / brachistochrone / ex_brachistochrone.py View on Github

p = Problem(model=Group())

    if optimizer == 'SNOPT':
        p.driver = pyOptSparseDriver()
        p.driver.options['optimizer'] = optimizer
        p.driver.opt_settings['Major iterations limit'] = 100
        p.driver.opt_settings['Major feasibility tolerance'] = 1.0E-6
        p.driver.opt_settings['Major optimality tolerance'] = 1.0E-6
        p.driver.opt_settings['iSumm'] = 6
    else:
        p.driver = ScipyOptimizeDriver()

    p.driver.options['dynamic_simul_derivs'] = dynamic_simul_derivs

    phase = Phase(transcription,
                  ode_class=BrachistochroneODE,
                  num_segments=num_segments,
                  transcription_order=transcription_order,
                  compressed=compressed)

    p.model.add_subsystem('phase0', phase)

    phase.set_time_options(fix_initial=True, fix_duration=True)

    phase.set_state_options('x', fix_initial=True, fix_final=False)
    phase.set_state_options('y', fix_initial=True, fix_final=False)
    phase.set_state_options('v', fix_initial=True, fix_final=False)

    phase.add_control('theta', opt=False, units='deg')

    phase.add_design_parameter('g', units='m/s**2', opt=False, val=9.80665)
    # phase.add_design_parameter('theta', units='deg', opt=False, val=45)

OpenMDAO / dymos / dymos / docs / feature_reference / transcriptions / figures / gauss-lobatto / plot_high_order_gauss_lobatto.py View on Github

import numpy as np

import matplotlib
matplotlib.use('Agg')
import matplotlib.pyplot as plt

import openmdao.api as om
import dymos as dm
from dymos.examples.brachistochrone.brachistochrone_ode import BrachistochroneODE

p = om.Problem(model=om.Group())
phase = dm.Phase(ode_class=BrachistochroneODE,
                 transcription=dm.GaussLobatto(num_segments=4, order=[3, 5, 3, 5]))
p.model.add_subsystem('phase0', phase)

p.setup()
p['phase0.t_initial'] = 1.0
p['phase0.t_duration'] = 9.0
p.run_model()

grid_data = phase.options['transcription'].grid_data

t_all = p.get_val('phase0.timeseries.time')
t_disc = t_all[grid_data.subset_node_indices['state_disc'], 0]
t_col = t_all[grid_data.subset_node_indices['col'], 0]


def f(x):  # pragma: no cover

How to use the dymos.examples.brachistochrone.brachistochrone_ode.BrachistochroneODE function in dymos

To help you get started, we’ve selected a few dymos examples, based on popular ways it is used in public projects.

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