Rear Assembly: Swingarm Configuration 1

#
#                                  *U_SPRING_MOUNT
#                                 /                   \
#                                .                     .
#                               /                       \
#        /--------------       .         ___________-----* SA_LEFT
#       /                     /         /              /⁻\\
#      /                 ___ .________/                /// \
#     / sa_left_outer  /    /                               \
#    /     *----------/    *               ___________-------* SA_RIGHT
#    \      \            l_spring_mount   /                 /⁻\\
#  wheel center*            _____________/                  /// .
#     \       \            /                                     \
#      \       *----------/
#       \   SA_right_outer
#        \
#         \
#          \---*----------
#             Wheel center ground reference
#

Points Name	Description	Type
wheel center	Center of the Wheel	mobile
SA RIGHT	Swingarm Right	fixed
SA LEFT	Swingarm Left	fixed
sa right outer	Swingarm right outer	mobile
sa left outer	Swingarm left outer	mobile
U SPRING MOUNT	Upper spring mount	fixed
l spring mount	lower spring mount	mobile

Import necessary libraries

import os
import numpy as np

from pymycar.MotorCycleKinematic import rear_bike_base_cantilever
data = {
    # --- Front assembly ---
    "wheel_center_front": np.array([650.0,   0.0,   -520.0]),
    "STEERING_AXIS_BOTTOM": np.array([650.0, 0.0,  -100.0]),
    "STEERING_AXIS_TOP":    np.array([570.0, 0.0,  250.0]),
    "fork_right_upper":  np.array([570.0, -110.0, 250.0]),
    "fork_left_upper":   np.array([570.0,  110.0, 250.0]),
    "fork_right_bottom": np.array([650.0, -120.0, -520.0]),
    "fork_left_bottom":  np.array([650.0,  120.0, -520.0]),
    # --- Rear assembly ---
    "wheel_center_rear": np.array([-600.0,   0.0,  -520.0]),
    "SA_RIGHT": np.array([-100.0, -90.0, -300.0]),
    "SA_LEFT":  np.array([-100.0,  90.0, -300.0]),
    "sa_right_outer": np.array([-600.0, -110.0, -520.0]),
    "sa_left_outer":  np.array([-600.0,  110.0, -520.0]),
    "U_SPRING_MOUNT": np.array([-150.0, 0.0,  50.0]),
    "l_spring_mount": np.array([-420.0, 0.0, -350.0]),
}
# file_path = 'data.suspgeo'
# data = load_defined_geometry("double_whisbone_base/input_geometry.suspgeo")

Call the Solver

solution, wheel_variables = rear_bike_base_cantilever(data,
                                max_height_increase=400,
                                max_height_decrease=400,
                                height_step=1.0,
                                save_to_txt=True,
                                result_folder_name="bike",
                                path = None)


import pyvista as pv
from pymycar.Cad.MotorCycle.rear_assembly import swingarm_cad_base
from pymycar.Cad.MotorCycle.frame import frame_cad_base
from pymycar.Cad.MotorCycle.rear_assembly import rear_suspension_cantilever

frame = frame_cad_base(data, index=None)

last_meshes = []
def plot_frame(plotter, data, index=None):
    global last_meshes

    if index is None:
        index = data["index_reference"]

    # swingarm, wheel_center1 = swingarm_cad_base(data, index)
    swingarm = swingarm_cad_base(data, index)
    suspension = rear_suspension_cantilever(data, index)
    # Remove the last meshes
    for mesh in last_meshes:
        plotter.remove_actor(mesh)

    # Add new meshes
    last_meshes = [

        # plotter.add_mesh(wheel_center1, color="black"),
        plotter.add_mesh(frame, color="red"),
        plotter.add_mesh(swingarm, color="blue"),
        plotter.add_mesh(suspension, color="green"),
        # plotter.add_mesh(lower_control_arm, color="pink"),
        # plotter.add_mesh(direction, color="green"),
        # plotter.add_mesh(wheel, color="black", opacity=0.5)
    ]


plotter = pv.Plotter()
def create_mesh(value):
    res = np.abs(solution["wheel_center_rear"][:,2] - value).argmin()
    plot_frame(plotter, solution, index=res)

plotter.add_slider_widget(create_mesh,
                          rng=[solution["wheel_center_rear"][0, 2], solution["wheel_center_rear"][-1, 2]],
                          value=solution["wheel_center_rear"][solution["index_reference"]][2],
                          title='Jounce')
plotter.show()

Static Scene

Interactive Scene

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/home/docs/checkouts/readthedocs.org/user_builds/pymycar/checkouts/latest/src/pymycar/CarKinematic/functions.py:89: RuntimeWarning: The iteration is not making good progress, as measured by the
 improvement from the last ten iterations.
  initial_guess = fsolve(residual,
/home/docs/checkouts/readthedocs.org/user_builds/pymycar/checkouts/latest/src/pymycar/CarKinematic/functions.py:105: RuntimeWarning: The iteration is not making good progress, as measured by the
 improvement from the last ten iterations.
  initial_guess = fsolve(residual, initial_guess, args=(wheel_center_z), fprime=jacobian,col_deriv=0,
/home/docs/checkouts/readthedocs.org/user_builds/pymycar/checkouts/latest/src/pymycar/CarKinematic/functions.py:105: RuntimeWarning: The iteration is not making good progress, as measured by the
 improvement from the last five Jacobian evaluations.
  initial_guess = fsolve(residual, initial_guess, args=(wheel_center_z), fprime=jacobian,col_deriv=0,