![]() ![]() The meshes themselves can be resized to match any vehicle dimensions. ![]() Virtual CRASH has many vehicle types that will likely match most use cases. It is common to need a vehicle for a given subject case only to not find it in a commercial accident reconstruction simulator’s model library. One of the many features that makes Virtual CRASH remarkable is its ability to modify the polygon meshes of the 3D objects within its library. The occupant and cargo options add additional mass to the vehicle system centered at the following locations depending on the option used:įront occupant: \( \left( 0.5 \cdot OAL 0.15 \cdot WB, y_\) is the \(x\), \(y\), or \(z\) moment of inertia after accounting for all additional masses. The “max steering angle” parameter controls the maximum allowed steering angle. The exact angle for each wheel is calculated assuming an Ackermann angle geometry. Generally the difference between the angles at each wheel (turning angle) is negligible. ![]() The actual angles of the wheels are automatically adjusted such that the equivalent turning radius is maintained (assuming no sideslip) for any track width. This will yield a specific turning radius which is directly dependent upon this angle as well as the vehicle wheelbase. The steering angle is defined at the axle the angle itself can be thought of as the angle of the wheel heading with respect to the local x-axis for an axle with zero-track-width. Note, in cases where the wheel displacement reaches the stop distance either in jounce or rebound, an effectively infinite force deflection model is assumed, where the wheel instantly comes to common velocity with the vehicle, after which the wheel suspension will return to equilibrium due to spring loading up to the stop value. ![]()
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