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Two-Wheeler MDL Library
Front Suspension Systems
Front suspension systems support the wheels in the front with the help of strut rods.
Scooter - Front Telescopic Fork (Classic)

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Multibody Modeling
MotionView is a general pre-processor for Multibody Dynamics.
- MotionView Overview
  MotionView is a general pre-processor for Multibody Dynamics.
- Model Browser
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  - Vehicle Libraries
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    - Two-Wheeler MDL Library
      - Build a Two-Wheeler Model
        The vehicle library is installed as a part of the normal MotionView installation.
      - Front Suspension Systems
        Front suspension systems support the wheels in the front with the help of strut rods.
        Motorcycle Telescopic - Rigid and Deformable Strut Rod (Classic)
        Motorcycle Telescopic - Rigid and Deformable Strut Rod (Inverted)
        Scooter - Single Side Trailing Link
        Scooter - Double Side Trailing Link
        Scooter - Double Side Leading Link
        Scooter - Front Telescopic Fork (Classic)
      - Rear Suspension Systems
        Rear Suspension systems support the rear wheel with the help of a swingarm and coil springs.
      - Linear Torque Powertrain
        A powertrain based on a linear curve where the torque generated is directly proportional to throttle applied.
      - Jounce and Rebound Systems
        Jounce and Rebound bumpers restrict the upward and downward movement of suspension components.
      - Rider
        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 multibody dynamics model.
      - Driveline
        The driveline transmits the power from the power source to the driving wheel.
  - Components Library
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- Tcl/Tk Reference Guide
  Reference material for the scripting interface which is a set of Tcl/Tk commands.
- MDL Reference Guide
  Reference materials for the MotionView MDL Language, Tire Modeling, and the MDL Library.
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  Reference material detailing command statements, model statements, functions and the Subroutine Interface available in MotionSolve.
- Templex and Math Reference Guide
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- MotionView Python Reference Guide
  Reference materials for the MotionView Python Language.
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Scooter - Front Telescopic Fork (Classic)

This suspension has a primary barrel tube and a slider tube is placed inside of it, providing free movement to the later one. It is laden with a spring and shock absorber inside. In the telescopic suspension, the slider is connected to the yoke of the handle while the barrel tube or damping unit is connected to the wheel.

Figure 1. Front Telescopic Fork (Classic) with Steering

Model Use

The Front Telescopic Fork Suspension system can be used in two-wheeler full vehicle models. The default geometry and mass approximate a two wheeler scooter, however 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 the brake disks or drum. The wheel hub and brake system 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 browser view of the systems on a fully populated front suspension model.

Figure 2. Browser View of Front Telescopic Fork (Classic) Suspension

Points

Points locate the joints and bushings that connect the suspension bodies to one another. The image below shows the principal points for the Front Telescopic Fork Suspension.

Figure 3. Right Side Points – Front Telescopic Fork (Classic) Suspension

Bodies

The Front Telescopic Fork (Classic) Suspension is comprised of the bodies shown in the image below:

Figure 4. Bodies – Front Telescopic Fork (Classic) Suspension

Bushings and Joints

The table below describes the bodies, bushings, and joints for the Front Telescopic Fork Suspension:


Label	Type	Body 1	Body 2	Point
Fork Tube to Rod	Translate	Shock Rod	Shock Tube	Shock Upper CG
Rod to Fork Fix	Fixed	Shock Rod	Steering Column	Steering Column Bottom End
Spindle to Fork	Fixed	Spindle	Shock Tube	Wheel Center
Spindle to Wheel	Revolute	Front Wheel	Spindle	Front Wheel CG
Steering REV Joint	Revolute	Handle	Frame	Steering Axis Top
Handle_st_column	Fixed	Handle	Steering Column	Steering Axis Top

The following image shows the location of the joints and bushings in the suspension:

Figure 5. Joints - Front Telescopic Fork (Classic) Suspension