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Federal Motor Vehicle Safety Standard (FMVSS) 202A - Head Restraints sets forth the criteria pertaining to the dimensional and safety requirements for outboard head restraints in passenger vehicles, light multipurpose vehicles, trucks, and buses. On December 7, 2004, the National Highway Traffic Safety Administration (NHTSA) officially published the Final Rule for FMVSS 202A[1]. The new requirements, with compliance to either a static option or a dynamic option, become effective on September 1, 2008 for front seat outboard occupants. For rear seat outboard occupants, the effective date is September 1, 2010, through an amendment published on March 9, 2006. This paper will discuss the dynamic test option and the changes to the test procedure and method used to conduct the test. An accelerator-type sled system, along with a 50th percentile male Hybrid III test dummy specified in 49 CFR Part 572 Subpart E and other peripheral items, are used in this testing.

Some years ago development, in the auto industry, of routine measurement of sound intensity in vector form, brought about major changes in determining sound power, particularly in improved accuracy and use in an indoor work area. However sound power is not yet being fully utilized. Accuracies within ± 10 % or ± 0.4 dB can be expected and narrow-band spectral data and intensity distributions on the integration surface can be used to identify and quantify component noise sources. In this paper new results are presented. In particular it is shown that sound power based on vector sound intensity can be determined accurately in a reverberation room.