Super Cobra (AH-1Z) Human Vibration Evaluation

The purpose of this investigation was to characterize and assess human vibration on board the Super Cobra AH-1Z helicopter. The study was conducted to support the U.S. Marine Corp USMC H-1 Upgrade Program for the UH-1N Huey and AH-1W Super Cobra. H-1 Crew Environment Survey at the request of the Naval Air Warfare Center Aircraft Division NAWCAD. Human Systems Division AIR 4.6. Triaxial acceleration measurements were made on the rigid seat. the interfaces between the occupant and cockpit seat pan and seat back. and on the helmet during selected flight conditions at both the aft and forward seat. The acceleration levels associated with specific frequency components of interest were evaluated. The vibration exposures were assessed in accordance with the International Standards Organization Mechanical Vibration and Shock - Evaluation of Human Exposure to Whole-Body Vibration - Part I General Requirements ISO 2631-1 1997 1 with regard to comfort and health risk. The results indicated that exposure to vibration during operation of the Super Cobra AH-1Z is expected to cause aircrew discomfort to varying degrees. There was some indication that prolonged and repeated exposures may produce the potential for health risk in accordance with ISO 2631-1