Jackstay energy-absorption device at lower part of passenger cabin floor of civil aircraft

Abstract

The invention discloses a jackstay energy-absorption device at the lower part of a passenger cabin floor of a civil aircraft, and belongs to the field of aircraft structure design. The device comprises a shrinkage pipe and hinged joints, wherein the shrinkage pipe adopts a core structure of the jackstay energy-absorption device, is mainly used for dissipating impact kinetic energy, is respectively connected with a passenger cabin floor bearer and an airframe reinforcing frame through the hinged joints, the shrinkage pipe adopts a round or square sectional structure, and comprises a plurality of pipe sections of different sectional sizes, when the section is round, the length of the upper part of the shrinkage pipe doubles that of the lower part thereof, when the section is square, the length of the upper part of the shrinkage pipe is equal to that of the lower part thereof, and the hinged joints can ensure that the shrinkage pipe always bears the axial compression load during the impact process, so that the purposes of improving the failure mode and improving the energy absorption efficiency are achieved. The jackstay energy-absorption device provided by the invention can be applied to structure design of large and medium civil aircrafts.

Description

technical field [0001] The invention belongs to the technical field of aircraft structure design, and in particular relates to an energy-absorbing device for struts at the lower part of the cabin floor of civil aircraft, which can be applied to the crashworthiness design of the fuselage structure of civil aircraft. Background technique [0002] Despite the continuous development and progress of aviation science and technology, it is still impossible to prevent the occurrence of accidents, and most of the accidents occur during the take-off and landing stages, where the crash speed is low, and the survival probability of the occupants can be improved through reasonable structural design . Therefore, how to protect the safety of the occupants in the event of a crash has become an important issue in the design of civil aircraft. The aviation administrations of countries around the world, including China, have formulated airworthiness regulations related to the safety of civil ...

AI Technical Summary

Problems solved by technology

Traditional civil aircraft strut structures often adopt a fixed connection method. In this case, the torsional failure mode generally occurs, and it is difficult to achieve the specified failure mode, which limits the energy absorption efficiency of the strut structure.

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