Components Library

The vehicle dynamic tools in MotionView model components commonly used in cars, trucks, and buses - like springs and bushings.
All auto entities share the following features:
  • They apply equal but opposite forces on two bodies.
  • The force depends on the displacement and velocity of one body relative to the other.
  • The parameters, for example stiffness, used to compute the force are stored in a property file that is independent of the MotionView MDL file and the MotionSolve input deck.
  • You must supply a property file for each auto entity employed in a MotionView model. A reference (path and name) to the property file is stored in the MotionView MDL file and in the MotionSolve input deck written by MotionView. Currently, only MotionSolve is supported.
  • Property files are:
    • Text files which may be viewed and edited using any common text editor (TextPad, WordPad, Vim, Emacs, UltraEdit, Notepad++, etc.).
    • Compatible with Adams/Car; property files from Adams/Car may be reused with the Auto Entities in MotionView.
    • Read by MotionSolve just prior to analysis.
Table 1. Available Auto Entities
Entity Function Features Uses
Bump-stop
AutoBumpStop
Limit suspension bump or jounce travel.
  • Exerts a force along a line to repel two bodies when the distance between the bodies is less the a threshold
  • Non-linear force verses deflection interpolated using Akima’s method from tabular data
  • Linear Damping
  • Vehicle Dynamics
  • Durability
Bushing
AutoBush
Elastically mount suspension arms, links, sub-frames, engines, gearboxes, etc. to vehicle chassis.
  • Exerts force and torque all directions.
  • Non-linear force/torque verses deflection interpolated using Akima’s method from tabular data
  • Linear damping
  • Suspension kinematic and compliance analysis
  • Vehicle Dynamics
Frequency Dependent Bushing
AutoBushFD
Elastically mount suspension arms, links, sub-frames, engines, gearboxes, etc. to vehicle chassis.
  • Exerts force and torque in all directions.
  • Stiffness and damping dependent on amplitude and frequency of bushing displacement
  • Non-linear static force/torque verses deflection
  • Ride comfort
  • Durability
Damper
AutoDamper
Dissipate energy stored in springs and damp chassis motions.
  • Exerts a force along a line between two bodies
  • Non-linear force verses velocity interpolated using Akima’s method from tabular data stored in a property file
  • Vehicle Dynamics
  • Ride Comfort
  • Durability
Rebound-stop
AutoReboundstop
Limit suspension rebound travel.
  • Exerts a force along a line to attract two bodies with the distance between the bodies exceeds a threshold
  • Non-linear force verses deflection interpolated using Akima’s methods from tabular data
  • Linear Damping
  • Vehicle Dynamics
  • Durability
Spring Air
AutoAirSpring
  • Limit force in suspension components
  • Maintain ride height for large variations in load
  • Isolate chassis by absorbing energy from vertical road inputs
  • Exerts a force along a line between two bodies
  • Non-linear force verses deflection at different static inflation pressures
  • Set the initial load and spring height to determine the static inflation pressure
  • Suspension Kinematics and Compliance
  • Vehicle Dynamics
  • Ride Comfort
  • Durability
Spring Coil
AutoSpring
  • Limit forces in suspension components
  • Isolate chassis by absorbing energy from vertical road inputs
  • Exerts a force along a line between two bodies
  • Non-linear force verses deflection interpolated using Akima’s methods from tabular data
  • Optionally set the initial load or length of the spring at vehicle input position
  • Suspension Kinematics and Compliance
  • Vehicle Dynamics
  • Ride Comfort
  • Durability
Tire
AutoTire
Generate forces for steering, accelerating, and braking. Isolate the vehicle from small road irregularities.
  • COSIN FTIRE (flexible ring) and Pacejka 2000 Magic Formula tire model
  • Supports family of CD-Tire models (flexible ring)
  • MF-TYRE
  • SWIFT-TYRE (rigid-ring)
  • 3D and 2D Road Models including Curved Gridded Road (CRG) and COSIN RGR
  • FTIRE: Ride Comfort & Durability
  • Pacejka 2000: Vehicle Dynamics
  • Vehicle Dynamics
  • Ride Comfort
  • Durability
  • MF-Tyre: Vehicle Dynamics
  • SWIFT-Tyre: Vehicle Dynamics & Ride Comfort