Performance Effects of Mounting a Helmet-Mounted Display on the ANVIS Mount of the HGU-56P Helmet (Reprint)
ARMY AEROMEDICAL RESEARCH LAB FORT RUCKER AL
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The U.S. Army, under the auspices of the Air Warrior Product Office, is developing a modular helmet-mounted display HMD for four aircraft series within its helicopter fleet. A design consideration is mounting the HMDs to the HGU-56P Aviators Night Vision Imaging System ANVIS mount. This particular mount is being considered, presumably due to its inherent cost savings, as the mount is already part of the helmet. Mounting the HMD in this position may have consequences for the daylight performance of these HMDs, as well as increasing the forward weight of the HMD. The latter would have consequences for helmet weight and center-of-mass biodynamic issues. Calculations were made of the increased luminance needed as a consequence of mounting the HMD in front of an HGU-56P tinted visor as opposed to mounting it behind the visor. By mounting in front of the helmets visor, the HMDs light output will be filtered as light coming from the outside world. Special consideration then would have to be given to the HMDs light source selection process, as not to select a source that would differentially reduce luminance by a mounted visor e.g., laser protection visor compared to the ambient light in the aviators field-of-view.
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