CN102582821A - Energy absorption scheme and layout mode of lower square tube supporting rod structure of passenger cabin floor of civil aircraft - Google Patents
Energy absorption scheme and layout mode of lower square tube supporting rod structure of passenger cabin floor of civil aircraft Download PDFInfo
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- CN102582821A CN102582821A CN2012100610412A CN201210061041A CN102582821A CN 102582821 A CN102582821 A CN 102582821A CN 2012100610412 A CN2012100610412 A CN 2012100610412A CN 201210061041 A CN201210061041 A CN 201210061041A CN 102582821 A CN102582821 A CN 102582821A
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Abstract
The invention discloses an energy absorption scheme and a layout mode of a lower square tube supporting rod structure of a passenger cabin floor of a civil aircraft. A square tube is used as a structure with high energy absorption efficiency and is applied to design of an energy absorption structure for the body of the civil aircraft. The supporting rod structure is positioned on the lower part of the passenger cabin floor and has the main effect of supporting the passenger cabin floor; the upper part and the lower part of the supporting rod structure are riveted with the lower parts of a passenger cabin floor beam and a body bulkhead respectively; and the lower part of the supporting rod is connected with the body bulkhead by using a reinforcing ribbed plate. The layout mode of the supporting rod structure is that the supporting rod is vertically arranged, and the junction of the lower part of the supporting rod structure and the body bulkhead is positioned at a position of quarter circular arc of the lower bulkhead of the passenger cabin floor of the body. The invention provides the scheme in which the square tube structure is used as the lower supporting rod of the passenger cabin floor, so that the crashworthiness of the body structure can be greatly improved, and the structural design of the original body is not required to be changed.
Description
Technical field
The invention belongs to the airframe structure design field of civil aircraft, be specifically related to the energy absorbing conceptual design and the location problem thereof of floor level bottom pole structure.
Background technology
Crash-worthiness is the essential key issue that solves in the civil aircraft design and research process; It is a main aspect of civil aircraft development and design; Relevant mechanism has formulated the air worthiness regulation about the civil aircraft crash-worthiness; Therefore press for and solve civil aircraft crash-worthiness design problem, and the energy absorbing structure design is one of civil aircraft fuselage structure crash-worthiness design-calculated key problem.
Be widely used in the crash-worthiness design of civil aircraft Landing Gear System, airframe structure and seat system like various high performance energy absorbing structures such as corrugated beams, foam and thin-wall pipe structures.For big-and-middle-sized civil aircraft, the design of the energy absorbing structure of airframe structure is the most important.In the energy absorbing structure design of fuselage, mainly start with from three aspects of design of fuselage bulkhead, fuselage bottom structure and floor level bottom pole structure.The fuselage bulkhead is to weigh down to hit the main energy absorbing structure in the process, also is one of most important structure in the civil aircraft structure simultaneously, relates to the main quiet dynamics of fuselage, and is can improved aspect smaller.Fuselage bottom structure is an important structure in small stationary wing aircraft and the design of helicopter crash-worthiness; But for big-and-middle-sized civil aircraft; The design of fuselage bottom structure energy absorbing structure is not a most important parts; Main effect is the initial load peak value that reduces in the civil aircraft collision process, and absorbs a part of impact kinetic energy.Floor level bottom pole structure is as the important structure parts of big-and-middle-sized civil aircraft fuselage bottom, mainly is used for supporting floor level, hits floor level bottom pole structure in the accident in bob the shock dynamics characteristic of airframe structure is had bigger influence.Through appropriate design, possibly can improve the crash-worthiness of civil aircraft greatly, and needn't change the design type of other civil aircraft structure member except that pole structure pole structure.But adopting the pole structure of which kind of structural shape and placement scheme thereof is a very important problem.
Summary of the invention
The present invention is directed to the energy absorbing structure design problem of present civil aircraft fuselage structure, the energy absorbing scheme and the layout type thereof of floor level bottom pole structure are studied.Calculate through a large amount of scientific simulations, the present invention proposes a kind of energy absorbing scheme and layout type thereof that adopts square tube as floor level bottom strut.This scheme only changes the structure and layout mode of strut, does not change original airframe structure design, can guarantee the Essential Performance Requirements of civil aircraft, can make airframe structure have better crashworthiness performance simultaneously.
The present invention is directed to the metal civil aircraft energy absorbing scheme and the layout type thereof of the pole structure of a kind of civil aircraft floor level bottom are provided; Do not change the design of the miscellaneous parts such as fuselage bulkhead of original airframe structure, but design floor level bottom pole structure pattern and position thereof again.Adopt rhs-structure as strut in the scheme of the present invention, the square tube upper and lower side is riveted with floor level beam and fuselage bulkhead respectively, and the bottom adopts deep floor and fuselage bulkhead to fix.Strut adopts vertical structures arranged pattern, and the lower end is positioned near the fuselage floor level lower fuselage bulkhead quadrntnt arc position.The airframe structure of this moment has crashworthiness performance preferably.In addition, in order further to improve the energy absorption efficiency of floor level bottom pole structure, can on the pole structure of floor level bottom, arrange trigger mechanism.
The invention has the advantages that:
(1) the energy absorbing scheme and the layout type thereof of fuselage floor level provided by the invention bottom pole structure can improve the energy absorption capacity of airframe structure, thereby improve airframe structure crashworthiness performance.
(2) the strut design plan of the present invention's proposition needn't change original airframe structure pattern, therefore can pneumatic, the strength and stiffness characteristic of airframe structure not exerted an influence, and the operation and maintenance performance does not change with having before changing.
Description of drawings
Fig. 1 is the airframe structure scheme drawing of existing civil aircraft band floor level bottom strut;
Fig. 2 be existing strut open the cross-section structure cross sectional drawing;
Fig. 3 is the cross sectional drawing of the rhs-structure that adopts of the present invention;
Fig. 4 is the triangle trigger mechanism on rhs-structure and top thereof;
Fig. 5 is the quadrangle trigger mechanism on rhs-structure and top thereof;
Fig. 6 is the position view of trigger mechanism on rhs-structure;
Fig. 7 is the position relation of strut and the floor level beam and the fuselage bulkhead of floor level bottom;
Fig. 8 is the schematic layout pattern of the pole structure of floor level bottom.
Among the figure:
1, fuselage bulkhead 2, strut 3, floor level 4, floor level beam
5, cargo deck 6, deep floor 7, outline 8, fuselage line of centers
9, underbelly center of arc's point 10, rhs-structure 11, open cross-section structure
The specific embodiment
Be elaborated below in conjunction with the energy absorbing scheme and the layout type thereof of accompanying drawing to the civil aircraft floor level bottom square tube pole structure of the present invention's proposition.
The research of energy absorbing structure is of crucial importance for the design of civil aircraft fuselage structure crash-worthiness with design.Hit in the process in the fuselage bob, airframe structure absorbs impact kinetic energy to ensure occupant's safety through plastic deformation or composite failure.In the design of fuselage energy absorbing structure, fuselage bulkhead, bottom construction and floor level bottom pole structure are most important parts.The fuselage bulkhead is most important energy absorbing member, and in big-and-middle-sized civil aircraft collision conquassation process, the fuselage bulkhead can absorb nearly 50% impact kinetic energy.Fuselage bottom structure reduces initial impact load and has vital function, and can absorb a part of impact kinetic energy for slowing down the fuselage initial impact.Floor level bottom pole structure mainly is used for supporting floor level, but in the design of civil aircraft crash-worthiness, can be used as energy absorbing device, and needn't change the crash-worthiness that other structures of fuselage just can be improved airframe structure greatly; And can also improve the energy absorption capacity of fuselage bulkhead through the appropriate design pole structure, so the energy absorbing structure pattern of fuselage floor level bottom strut and placement scheme thereof are to civil aircraft crash-worthiness design and important.
The present invention proposes the scheme of a kind of later-model employing square tube as floor level pole structure and layout thereof, specific embodiments is following:
As shown in Figure 1, the civil aircraft fuselage structure comprises fuselage bulkhead 1, strut 2, floor level 3, floor level beam 4 and cargo deck 5 etc.Big-and-middle-sized civil aircraft floor level 3 lower fuselage outlines 7 are circular arc, and the present invention keeps airframe structure other structural shapes except that floor level 3 bottom struts 2 structures constant, and rhs-structure 10 is applied to 2 designs of fuselage floor level 3 bottom struts.Traditional floor level 3 bottom struts 2 are for opening cross-section structure 11, and cross sectional drawing distributes as shown in Figure 3, opens cross-section structure 11 and has flanging, and at each corner round-corner transition is arranged.On each fuselage bulkhead 1, all adopt strut 2 to support floor level 3, strut 2 is symmetrical distribution about fuselage line of centers 8.Rhs-structure 10 cross sectional shapes that the present invention adopts are shown in 3, and there is round-corner transition the square-section of rhs-structure 10 for having the closed section structure at the place, right angle of square-section.Like Fig. 1 and shown in Figure 7, rhs-structure 10 is during as strut 2, its top and 4 riveted joints of floor level beam, and bottom and 1 riveted joint of fuselage bulkhead, and adopt a strengthening rib 6 fixing, described strengthening rib 6 is fixed on strut 2 and fuselage bulkhead 1 bonded assembly position.
When adopting rhs-structure 10 as floor level 3 bottom struts 2; The layout type of strut 2 adopts the mode like Fig. 8; The lower extreme point of strut 2 (promptly and the coupling end of fuselage bulkhead 1) and the line and the angle between the horizon of underbelly center of arc's point 9 are β, and the angle of strut 2 and horizontal surface is α.In the present invention, the layout type of strut 2 is vertical layout, and promptly α is 90 °; Angle beta is about 45 ° in the layout type of strut 2, promptly in floor level 3 lower fuselage bulkheads 1 quadrntnt arc position.The airframe structure of this moment has crashworthiness performance preferably.Approximate " Z ", " C ", " J " or " I " type cross sectional shape can be adopted in the cross section of the fuselage bulkhead 1 that is adopted.
Structure member used among the present invention all adopts the metallic aluminium alloy material; Rhs-structure 10 is the overall crashworthiness performances of rhs-structure 10 raising airframe structures through the high-energy absorption rate as the main purpose of strut 2, and can improve the energy absorption capacity of fuselage bulkhead 1.On rhs-structure 10, arrange and further to improve the pole structure energy absorption capacity like Fig. 4 and triangle or quadrangle trigger mechanism shown in Figure 5.As shown in Figure 6, described trigger mechanism is arranged on the outer wall of rhs-structure 10, and in the course of processing, the thickness of pipe of the rhs-structure 10 of assurance trigger mechanism placement is constant.Also can satisfy the structure design needs as required in strut 2 perforates of rhs-structure.
Claims (6)
1. the energy absorbing scheme of civil aircraft floor level bottom square tube pole structure; It is characterized in that: civil aircraft fuselage structure floor level pole structure is designed to rhs-structure; Keep other structure Design of civil aircraft fuselage constant; Strut two ends is up and down riveted with floor level beam and fuselage bulkhead respectively, and the lower end has also adopted deep floor to be fixed on the fuselage bulkhead; The cross section of described rhs-structure is the sealing square-section.
2. the energy absorbing scheme of civil aircraft floor level according to claim 1 bottom square tube pole structure is characterized in that: the material selection metallic aluminium alloy material of rhs-structure.
3. the energy absorbing scheme of civil aircraft floor level according to claim 1 bottom square tube pole structure is characterized in that: the rectangle drift angle chamfering of rhs-structure.
4. the energy absorbing scheme of civil aircraft floor level according to claim 1 bottom square tube pole structure; It is characterized in that: triangle or quadrangle trigger mechanism are set, on the rhs-structure to induce the higher failure mode of strut produce power absorption efficiency under the floor level.
Civil aircraft floor level bottom square tube pole structure layout type, it is characterized in that: the angle of strut and horizontal surface is 90 °, and strut lower end and fuselage bulkhead junction are positioned at floor level lower fuselage bulkhead quadrntnt arc position.
6. the layout type of civil aircraft floor level according to claim 5 bottom square tube pole structure is characterized in that: the line of described strut lower end and underbelly center of arc's point, and the angle between the horizon is 45 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100610412A CN102582821A (en) | 2012-03-09 | 2012-03-09 | Energy absorption scheme and layout mode of lower square tube supporting rod structure of passenger cabin floor of civil aircraft |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100610412A CN102582821A (en) | 2012-03-09 | 2012-03-09 | Energy absorption scheme and layout mode of lower square tube supporting rod structure of passenger cabin floor of civil aircraft |
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| CN102582821A true CN102582821A (en) | 2012-07-18 |
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| CN2012100610412A Pending CN102582821A (en) | 2012-03-09 | 2012-03-09 | Energy absorption scheme and layout mode of lower square tube supporting rod structure of passenger cabin floor of civil aircraft |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108860563A (en) * | 2018-04-04 | 2018-11-23 | 上海交通大学 | Anti- pendant hits energy-absorbing pillar under a kind of airplane floor |
| CN112380618A (en) * | 2020-10-30 | 2021-02-19 | 中国直升机设计研究所 | Rapid design method for internal shape of passenger cargo compartment of transport helicopter |
| CN112373672A (en) * | 2020-11-10 | 2021-02-19 | 中国商用飞机有限责任公司 | Energy absorption structure of lower structure of cargo compartment floor of airplane |
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| CN101432190A (en) * | 2006-04-25 | 2009-05-13 | 空中客车德国有限公司 | Floor structure for a fuselage |
| CN201633641U (en) * | 2010-02-01 | 2010-11-17 | 纽贝耳汽车(杭州)有限公司 | Electric integrated mounting support of electric vehicle |
| US20110001006A1 (en) * | 2009-07-02 | 2011-01-06 | Airbus Operations | Process for making an aircraft having a floor |
| CN102159380A (en) * | 2008-09-29 | 2011-08-17 | 空中客车作业有限公司 | Fiber composite component for energy absorption in the event of a crash for an aircraft or spacecraft, fuselage structural section of an aircraft or spacecraft, and aircraft or spacecraft |
| US20110233339A1 (en) * | 2010-03-23 | 2011-09-29 | Be Aerospace, Inc. | Passenger seat assembly and associated floor panel structure |
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2012
- 2012-03-09 CN CN2012100610412A patent/CN102582821A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101432190A (en) * | 2006-04-25 | 2009-05-13 | 空中客车德国有限公司 | Floor structure for a fuselage |
| CN102159380A (en) * | 2008-09-29 | 2011-08-17 | 空中客车作业有限公司 | Fiber composite component for energy absorption in the event of a crash for an aircraft or spacecraft, fuselage structural section of an aircraft or spacecraft, and aircraft or spacecraft |
| US20110001006A1 (en) * | 2009-07-02 | 2011-01-06 | Airbus Operations | Process for making an aircraft having a floor |
| CN201633641U (en) * | 2010-02-01 | 2010-11-17 | 纽贝耳汽车(杭州)有限公司 | Electric integrated mounting support of electric vehicle |
| US20110233339A1 (en) * | 2010-03-23 | 2011-09-29 | Be Aerospace, Inc. | Passenger seat assembly and associated floor panel structure |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108860563A (en) * | 2018-04-04 | 2018-11-23 | 上海交通大学 | Anti- pendant hits energy-absorbing pillar under a kind of airplane floor |
| CN112380618A (en) * | 2020-10-30 | 2021-02-19 | 中国直升机设计研究所 | Rapid design method for internal shape of passenger cargo compartment of transport helicopter |
| CN112380618B (en) * | 2020-10-30 | 2022-11-18 | 中国直升机设计研究所 | Rapid design method for internal shape of passenger cargo compartment of transport helicopter |
| CN112373672A (en) * | 2020-11-10 | 2021-02-19 | 中国商用飞机有限责任公司 | Energy absorption structure of lower structure of cargo compartment floor of airplane |
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Application publication date: 20120718 |