brim.brim.seats.FixedSeat

class brim.brim.seats.FixedSeat(name: str)

Bases: PelvisInterPointMixin, SeatBase

Rider connection between the rear frame and the pelvis.

Explanation

The pelvis of the rider is fixed to the rear frame using a weld joint. This weld joint uses an intermediate frame oriented w.r.t. the rear frame. This intermediate is by default oriented with respect to the rear frame using a time-independent yaw-pitch-roll rotation.

Attributes

auxiliary_handler	Auxiliary data handler of the model.
descriptions	Descriptions of the objects.
load_groups	Load groups of the connection.
name	Name of the object.
pelvis	Pelvis of the rider.
pelvis_interpoint	Return the rotation point w.r.t.
rear_frame	Rear frame of the bicycle.
rear_interframe	Intermediate frame to which the pelvis is fixed.
required_models
submodels	Submodels of the connection.
system	System object used to store the information of the model itself.

Methods

__init__	Create a new instance of the connection.
add_load_groups	Add load groups to the connection.
define_constraints	Define the constraints on the connection.
define_kinematics	Define the kinematics of the connection.
define_loads	Define the loads on the connection.
define_objects	Define the objects in the connection.
get_all_symbols	Get all declared symbols of a model.
get_description	Get description of a given object.
get_param_values	Get a parameters mapping of a model based on a bicycle parameters object.
set_plot_objects	Set the symmeplot plot objects.

__init__(name: str) → None

Create a new instance of the connection.

Parameters:

name (str) – Name of the connection.

__repr__() → str

Return repr(self).

__str__() → str

Return str(self).

__weakref__

list of weak references to the object (if defined)

add_load_groups(*load_groups: LoadGroupBase) → None

Add load groups to the connection.

property auxiliary_handler: AuxiliaryDataHandler | None

Auxiliary data handler of the model.

define_constraints() → None

Define the constraints on the connection.

define_kinematics() → None

Define the kinematics of the connection.

define_loads() → None

Define the loads on the connection.

define_objects() → None

Define the objects in the connection.

property descriptions: dict[Any, str]

Descriptions of the objects.

get_all_symbols() → set[sympy.core.basic.Basic]

Get all declared symbols of a model.

get_description(obj: Any) → str

Get description of a given object.

get_param_values(bicycle_parameters: Bicycle) → dict[sympy.core.symbol.Symbol, float]

Get a parameters mapping of a model based on a bicycle parameters object.

property load_groups: tuple[brim.core.base_classes.LoadGroupBase]

Load groups of the connection.

property name: str

Name of the object.

property pelvis: PelvisBase

Pelvis of the rider.

property pelvis_interpoint: Vector | Point | None

Return the rotation point w.r.t. the pelvis.

Explanation

The pelvis interpoint can either be a vector w.r.t. the the center of mass of the pelvis or a point fixed on the pelvis body. This point will also get a zero velocity with respect to the saddle.

property rear_frame: RearFrameBase

Rear frame of the bicycle.

property rear_interframe: ReferenceFrame

Intermediate frame to which the pelvis is fixed.

set_plot_objects(plot_object: MplPlotBase) → None

Set the symmeplot plot objects.

property submodels: tuple[brim.core.base_classes.ModelBase]

Submodels of the connection.

property system: System | None

System object used to store the information of the model itself.

Notes

This system object is used to store the information of the model itself. It does not by definition contain any information about the submodels or connections. Therefore, one cannot use this system object to form the equations of motion. Instead, one should use the to_system() method to get the system object representing the entire model.