Purpose and scope. This standard specifies requirements to afford impact protection for occupants. This standard applies to passenger cars and to multipurpose passenger vehicles , trucks, and buses with a GVWR of 4, kilograms or less, except that the requirements of S6 do not apply to buses with a GVWR of more than 3, kilograms. Ambulance means a motor vehicle designed exclusively for the purpose of emergency medical care, as evidenced by the presence of a passenger compartment to accommodate emergency medical personnel, one or more patients on litters or cots, and equipment and supplies for emergency care at a location or during transport.
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This rule specifies improved upper interior head impact protection requirements for all vehicles with a GVWR of 10, lbs or less and buses under 8, lbs. The purpose of this new safety standard is to afford occupants within a vehicle additional protection to reduce the likelihood of severe head injury regardless of the type of vehicle collision.
This procedure includes information regarding set-up, targeting, testing, and data analysis. The targeting procedure, which locates all applicable target points on the upper interior trim of a vehicle, was written without being vehicle-specific. This test procedure is one of the most complex and time-consuming testing protocols developed in recent years.
The NHTSA test procedure calls out for measurements during the targeting procedure to be made manually without relying on OEM-specified target locations. Though this method is used currently, a second test method involving the use of a Coordinate Measurement Machine CMM in conjunction with some manual measurements may be a better alternative. This paper will present background information on FMVSS U testing, describe the vehicle targeting process in detail, provide data which compares the manual targeting method to a computer-aided targeting method using a CMM, and discuss the potential advantages of a computerized targeting procedure.
Author s : Helen A. Rychlewski, Jessica A. Cronkhite, Michael J.
Federal Motor Vehicle Safety Standards
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FMVSS 201U TESTING - VEHICLE TARGETING USING BOTH MANUAL AND COMPUTER-AIDED METHODS