VPG's Structure module allows the user to define LS-DYNA models which can be used for mechanical system analysis including tire model, suspension model and road surfaces. eta/VPG uses an analysis approach consistent with test environments dynamic non-linear analysis using real-time boundary conditions. Road Surface Models * Digitized from MGA proving ground roads * Any 3-D data can be used to generate road surfaces Tire Models * 3-D FEA models including the tire air pressure * Frictional Contact interface with road * Validated versus test data Vehicle Dynamics * Road Load Generation * Use of simplified models for event-based loads * Rigid and flexible members * Component or sub-system studies Full System & Component Durability / Fatigue Assessment * Time-domain transient stress and strain prediction * eta/VPG fatigue analysis tool included * Allows multiple material assignment * Provides a way to create user defined materials * Users can output files useful in other fatigue codes * Simulation of durability critical proving ground events * Calculate material damage of each event * Calculate the “occurrence” cycles * Accumulate damages per cycle to predict fatigue life.