Civil aircraft fuselage bottom structure based on impact strength tests

A technology for the bottom of the fuselage and civil aircraft, applied in the direction of the fuselage, aircraft parts, fuselage frame, etc., can solve the problems of long duration of high overload, high peak value of initial load, poor crashworthiness, etc., to improve crashworthiness crash performance, good crashworthiness, and good crash resistance

Inactive Publication Date: 2009-12-09
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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...

Method used

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  • Civil aircraft fuselage bottom structure based on impact strength tests
  • Civil aircraft fuselage bottom structure based on impact strength tests
  • Civil aircraft fuselage bottom structure based on impact strength tests

Examples

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Embodiment

[0035]In this example, the size of an improved foam structure at the bottom of the fuselage is given. The height of the middle position of the top bulkhead frame 2 of the foam 1 is 70mm, while the height of the bulkhead frame 2 on both sides of the foam 1 is 50.01mm, and the transverse half-width of the foam is 352mm , The side height of foam 1 is 22mm. The middle position of the top of the foam 1 is a "Z"-shaped cross-section long stringer, and the two sides of the top are approximately inverted "T"-shaped cross-section long stringers, and the distance from the center line of the fuselage is 150mm. The space between the foam 1 under the adjacent spacers 2 is half of the distance between the two spacers 2 , that is, the longitudinal length of the foam 1 is half of the space between the spacers 2 . The thickness of the top skin 9 of the foam 1 is 1 mm, while the thickness of the belly skin 10 is 0.8 mm. The cross-sectional shape of the bulkhead 2 is consistent with the traditi...

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PUM

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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...

Claims

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Application Information

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IPC IPC(8): B64C1/06B64C1/08
Inventor 向锦武罗漳平任毅如郑建强
Owner BEIHANG UNIV
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