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Abstract The helicopter emergency flotation system consists of a buoy installation mechanism, a high-pressure gas bottle, and an electronic control starting device. The buoy assembly cabin is an important part of the buoy installation mechanism. During the flotation test, openings and cracks appeared in the pontoon assembly cabin due to insufficient strength. To avoid the occurrence of openings and cracks, methods such as rounding corners at the locations of openings and cracks, carbon fiber cross-laying technology, and changing cross-sections at stress concentration locations are adopted. The improved method was applied to the buoy cabin of the emergency flotation system, and the damage coefficient in the front and back states was simulated. The simulation results showed that the damage coefficient was reduced by 59%. After the improved cabin was subjected to the emergency flotation system flotation test, the openings and cracks in the pontoon assembly cabin disappeared, indicating that the improvement method was effective and could improve the strength and performance of the cabin.
Li et al. (Wed,) studied this question.