Civil aircraft fuselage bottom structure based on impact strength tests

Abstract

The invention discloses a civil aircraft fuselage bottom structure considering impact strength, comprising bulkheads, outer panel skin, long purlins and foam; on the foundation of arc-shaped fuselage bulkheads, the contour of the fuselage remains unchanged, upper architraves and lower architraves of the bulkheads are hoisted upwards, the arc shape of the bulkhead bottom is changed to the flatbottom shape, the lower part of each bulkhead is symmetrically provided with a piece of foam, the ends at the two sides of the foam are provided with non-closed-angle-shaped structures in certain height, the lower part of the foam is supported by ventral outer panel skin, the top and sides of the foam adopt the outer panel skin for supporting, the two sides and the top of the foam are provided with long purlin structures which have the function of longitudinal reinforcement. The fuselage bottom foam structure of the invention can greatly improve the crash resistance of the fuselage structure, the new structure consisting of the outer panel skin and the foam contributes to bearing distributed load, as a result, the fuselage bottom structure of the invention not only has good crash resistance against ground crash but also has good crash resistance against water surface impact accidents.

Description

technical field [0001] The invention belongs to the technical field of fuselage structure design of civil aircraft, and in particular relates to the design of the bottom structure of the fuselage of civil aircraft based on crashworthiness design. Background technique [0002] The crashworthiness of the fuselage structure of civil aircraft is directly related to the safety of the occupants in the event of a crash, and is an important aspect of the structural design of civil aircraft. Maintaining the structural integrity of the fuselage and limiting the acceleration transmitted to the occupants within the range that can be tolerated by humans are the two main objectives of the crashworthiness design of the fuselage structure of civil aircraft. [0003] As people pay more and more attention to aviation safety, more and more scholars and scientific research institutions have begun to study various methods to improve the crashworthiness of civil aircraft. At present, the researc...

AI Technical Summary

Problems solved by technology

For ground impact, due to the high initial contact stiffness between the connecting part of the frame and the skin and the ground, during the impact process of the fuselage structure, the peak value of the initial load will be relatively high, and the duration of high overload will be relatively long, and the fuselage structure It cannot absorb the impact kinetic energy well, so the traditional civil aircraft fuselage structure has poor crash resistance

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