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PDOFPrincipal Direction of Force
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The Ford Escape struck the back of a 2013 Ford F150 at 0[degrees] PDOF, with an EDR-recorded longitudinal delta-V of 50 km/h (31 mph) resulting in a maximum crush of 43 cm.
Furthermore, if the derivative of the state x(t) (or the output y(t)) is accessible during the control process, a proportional and derivative state feedback (PDSF) (or proportional and derivative output feedback (PDOF)) controller can be equipped to stabilize the closed-loop descriptor systems [32-37].
This was inconsistent with the laws of physics, which dictate that all occupants will move toward the same principle direction of force (PDOF) in a collision, which, in this case, would be in a rearward direction.