Impact resistant structure for the helicopter and energy absorber used for the same
AssigneeKawasaki Jukogyo Kabushiki Kaisha
InventorTohru Hayashi
Life of this patent
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Abstract
An impact resistant structure of a helicopter having an energy absorber positioned under a floor of the helicopter and directly connected to a cabin frame of the helicopter. The energy absorber is arranged in accordance with a distribution of a ground reaction force on a general ground at a time of crash situation. The energy absorber also includes a plurality of independent hollow tubes of fiber reinforced composite material integrally formed by bundling only the hollow tubes. The hollow tubes are arranged so as to reduce a number of intersecting wall surfaces of the hollow tubes.
Claims14
An impact resistant structure of a helicopter, comprising a plurality of energy absorbers, each one of the energy absorbers is formed in a bundled-tube state, positioned under a floor of said helicopter and directly connected to a cabin frame of said helicopter, said energy absorbers being arranged in accordance with a distribution of a ground reaction force on a general ground surface at a time of crash situation so that said energy absorbers are positioned almost directly under a pair of side walls of said frame where impact loads are concentrated at said time of crash situation.
An energy absorber, comprising a plurality of independent hollow tubes of fiber reinforced composite material integrally formed by bundling only said hollow tubes of fiber reinforced composite material, said hollow tubes of fiber reinforced composite material being arranged so as to reduce a number of intersecting walls of said hollow tubes of fiber reinforced composite material, wherein each of said hollow tubes of fiber reinforced composite material is formed in a plurality of layers in a thickness direction, a film-shaped layer material having lower strength than that of a base material being inserted between end portions of said plurality of layers.
An energy absorber, comprising a plurality of independent hollow tubes of fiber reinforced composite material bundled by an outer layer of fiber reinforced composite material,
- wherein said hollow tubes of fiber reinforced composite material and said outer layer of fiber reinforced composite material are arranged so as to reduce a number of intersecting walls of at least one of said hollow tubes of fiber reinforced composite material and said outer layer of fiber reinforced composite material, wherein at least said outer layer of fiber reinforced composite material for bundling said hollow tubes are formed in a plurality of layers in a thickness direction, a film-shaped layer material having lower strength than that of a base material being inserted between end portions of said plurality of layers.
Dependencies are inferred from the claim text.