A MEASURED SOLUTION


time would be substantially less. Correlat- ing the vehicle’s doors and roof structural integrity with M&S also allowed an examination of various parameters for ditch aspects.


Further assumptions in comparison with actual rollovers included the condition of the vehicle’s tires making contact with surface, the type of surface, and the sys- tem’s sensors and algorithm parameters for side slip, roll rate, and acceleration.


SYSTEM PERFORMANCE In quantifying and qualifying the perfor- mance of the system, safety of the vehicle occupants is an operational requirement, - cal. Consideration also must be given to system characteristics relating to occupant human factors (such as accommodation, ingress, and egress), environmental con- straints, reliability, and maintainability.


DOLLY ROLLOVER (TOP)


This generic diagram shows the modeling and simulation (M&S) for a dolly rollover of the M1151A1 HMMWV.


DITCH ROLLOVER (BOTTOM)


This generic diagram shows the M&S for a lateral ditch rollover of the M1151A1 HMMWV. (Images courtesy of TK Holdings Inc.)


The requirements in AM General’s per-     components of the system as well as hav- ing the system installed in a vehicle. The supplier would handle the testing of its system components. The T&E of the system installed in a vehicle would be a collaboration among the government, AM General, and the supplier.


INVOLVING ATEC


for occupants without PPE vest and hel- met. Thus, the baseline excluded PPE, emphasizing the predetermined seating arrangements of occupants. Follow-up rollover T&E using instrumented ATDs 


FMVSS 208 and SAE J2114 readily applied to the M&S and T&E for vehicle


64


dolly rollovers. Assumptions were used for M&S of ditch rollovers when needed.  at 5 mph, yet decisions had to be made on whether the type of ditch would be along- side an embankment or hill, and at what height and angle. One of the supplier’s modelers realized that by doubling the vehicle speed, the computer processing


As the M&S effort moved along, plan- ning the rollover T&E required involving the U.S. Army Test and Evaluation Com- mand (ATEC) to address not only a test  system on a HMMWV.


Initial discussion with ATEC represen- tatives centered around how to properly test the reliability of the system, because ensuring that air bags will deploy is crucial, while having air bags deploy inad- vertently on occupants is not desirable.


Army AL&T Magazine


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