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HVE Simulation Technology:

Advanced Tire-Terrain Models

Three advanced tire-terrain models in HVE allow accident reconstructionists and safety researchers to study vehicle handling and safety issues that arise when tires travel over non-rigid and uneven surfaces. During a simulation, SIMON incorporates the forces and moments produced by these models into its equations of motion, providing valuable prediction of the vehicle response to tire-terrain conditions involving curb impacts and soft soil. Detailed information about the tire-terrain models is available in HVE-WP-2005-6, "Simulation of Tire Interaction with Curbs and Irregular Terrain."

Radial Spring Tire Model • This model allows for simulating tires mounting curbs and rolling over potholes. The tire is modeled as a series of springs lying in the tire plane and projecting radially outward from the wheel center.

A validation of this tire model is available in SAE 2008-01-0158, "Vehicle Speed Change and Acceleration Associated with Curb Impacts and a Comparison to Computer Simulation with a Multi-Point Radial Spring Tire Model."

Sidewall Impact Tire Model• This model is an extension of the Radial Spring Tire Model and allows for a rigorous modeling of the force applied to the sidewall of a tire such as occurs in a curb-tripped rollover. Each radial spring has springs projecting laterally from the wheel plane to the tire sidewall plane.

A validation of this tire model is available in SAE 2009-01-0464, "Computer Simulation of Pavement Edge Traversal."

Soft Soil Tire Model • This model allows for calculating tire drag for a vehicle that has left the roadway and is traveling through soft dirt, sand or similar material. The model is based on research performed by M.G. Bekker at the University of Michigan. In the model, tire sinkage into the soil is calculated using an empirical model developed by Bekker.

The Advanced Tire-Terrain Models are just one of the many advanced simulation technologies available in the HVE (Human-Vehicle-Environment) simulation software suite used by motor vehicle crash reconstructionists in over 30 countries. To learn more about HVE Version 9.1, contact EDC or call 888.768.6216.

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