Rider plays an important role in two wheeler dynamics. To capture the effects of rider on a vehicle, it is important
to have a good human body multi-body dynamics model.
This Suspension contains a Double Swing Arm which contains four pivot points each connected
to the Wheel, Damper, Steering Link, and Spring respectively. The wheel is suspended behind
the pivot point through a link. Since the link leads the pivot point in this case, it is
called a Trailing Link suspension.
Model Use
The Double Side Trailing Link Suspension system can be used in front half vehicle or full
vehicle models of a two wheeler. The default geometry and mass approximate that of a two
wheeler scooter, but the model and data can be revised to reflect any size two wheeler.
Note:
The wheel body represents the mass and inertia of the tire and
the rim.
The wheel hub body represents the mass and inertia of other rotating bodies such as
a brake rotor. The wheel hub and brake rotor have no associated graphics.
The wheel and wheel hub parts use the Wheel center location as the center of
gravity.
The image below shows the Project browser view of the systems on a fully populated front
suspension model. The Double Side Trailing Link Suspension system has six “child”
systems.
Points
Points locate the joints and bushings that connect the
suspension bodies to one another. The image below shows the principal points for
the Double Side Trailing Link Suspension.
Note: The image above omits the left side of the suspension, points
locating body centers of mass, and points that locate the optional subsystems (springs,
dampers, bump stops and stabilizer bar) for clarity.
Bodies
The Double Side Trailing Link Suspension is comprised of the bodies shown in the image
below:
Bushings and Joints
The table below describes the bodies, bushings, and joints for a Double Side Trailing Link
Suspension:
Label
Type
Body 1
Body 2
Point
Notes
Steering Swingarm Attachment Joint
Revolute
Swing Arm
Steering Column
Swingarm steering Att Point
Swingarm Spindle Att Joint
Fixed
Spindle
Swing Arm
Front Wheel CG
Spindle to Wheel
Revolute
Front Wheel
Spindle
Front Wheel CG
Steering REV Joint
Revolute
Handle
Frame
Steering Axis Top
Handle
Fixed
Handle
Steering Column
Steering Axis Top
The following image shows the location of the joints and bushings in the
suspension: