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Alternative Title:Traffic accident simulation.
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Abstract:The purpose of this research was to determine if HVOSM (Highway Vehicle Object Simulation Model) could be used to model a vehicle with a modern front (or rear) suspension system such as a McPherson strut and have the results of the dynamic model be valid. To accomplish this task, the types of suspension systems modeled in HVOSM and how they were mathematically represented in the equations of motion that govern the dynamics of the vehicle in the simulation were investigated.
HVOSM constrains the motion of the center of the wheel to translate along a straight line that is perpendicular to the X-Y plane of the coordinate system attached to the vehicle (SAE Standard Coordinates). Tire forces, shock forces, spring forces, anti-pitch and anti-roll forces are calculated and applied to the body of the vehicle. Tire forces caused by the deviation from the straight line motion of the center of the wheel that are a result of the actual geometry of the suspension system are experimentally measured and included in the appropriate body forces.
To determine if a vehicle with a McPherson strut could be accurately modeled in HVOSM, both the McPherson strut and the double a-arm suspension were evaluated kinematically. How each system influenced the change in track width and camber angle through the vertical motion of wheel were compared.
It was determined that a wheel on a vehicle with a McPherson strut suspension system has a "straighter" straight line motion than does a wheel on a vehicle with a double a-arm suspension system.
To results of the study enable the user of HVOSM to model a vehicle with a McPherson strut suspension system and be confident that the simulation is as accurate as if the vehicle had a double a-arm suspension system.
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