Abstract
Airborne noise levels have been measured in spaces adjacent to F-35B operations in proximity to the flight deck on Large Amphibious Assault Class ships (L Class). Noise levels observed in some manned spaces are hearing hazardous. The noise produced during high performance jet operations is intermittent to steady state in duration. Results reported here are only for vertical landings (VL) and do not include short takeoffs (STO); however, noise due to both VL and STO exhibit similar characteristics. Observed VL noise features include two prominent types of noise sources during aircraft decent as well as source directionality. These features are compared to LES CFD predictions for a supersonic jet impinging on a plate. Qualitative features observed in data have been included in a noise model to predict noise levels in Gallery deck compartments. Predicted noise levels are used to ascertain noise treatments and hearing protection on L Class ships during F-35B air operations. Motivations for controlling noise levels are to prevent or reduce hearing threshold shifts in crew members and to promote hearing recovery and communication intelligibility. Noise characteristics of F-35B landings and diagrams of predicted noise levels that address noise-induced hearing loss, hearing recovery, and communication intelligibility are shown.
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