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