CN110263455B - Windmill-shaped thin-walled tube structure energy absorption system capable of realizing multi-dimensional self-locking and easy to assemble - Google Patents
Windmill-shaped thin-walled tube structure energy absorption system capable of realizing multi-dimensional self-locking and easy to assemble Download PDFInfo
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- CN110263455B CN110263455B CN201910555728.3A CN201910555728A CN110263455B CN 110263455 B CN110263455 B CN 110263455B CN 201910555728 A CN201910555728 A CN 201910555728A CN 110263455 B CN110263455 B CN 110263455B
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Abstract
The invention discloses an energy absorption system capable of being easily assembled in a multi-dimensional self-locking windmill-shaped thin-wall pipe structure, which is a windmill-shaped thin-wall pipe structure made of metal materials, wherein a combined structure is formed by staggered arrangement of a plurality of windmill-shaped thin-wall pipe sub-structures, each windmill-shaped thin-wall pipe sub-structure is formed by four blades, and the cross section of each blade is formed by connecting two parallel straight lines through circular arcs with a central angle of 270 degrees. According to the invention, through the design of simulating the outer contour of the windmill, self-locking between each adjacent windmill-shaped sub-structures in the process of impacting in any direction in space is realized, the defect that a traditional energy absorption system needs to be provided with a restraint device externally or a connecting device internally is processed is overcome, the time cost and the labor and material cost for assembly and disassembly are greatly reduced, the defect that the traditional dumbbell-shaped self-locking pipe energy absorption system can only deal with the impact in a specific single direction is also solved, the impact energy is converted into elastic deformation and plastic dissipation of the structure by utilizing the self-locking effect between the structures, and the impact energy can be effectively absorbed. According to the energy of the impact objects and the actual situation of the field, the number and the layers of the windmill-shaped thin-walled tube sub-structures arranged on each layer of the combined structure can be freely adjusted, and the utilization rate of the material is simply and effectively improved.
Description
Technical Field
The invention relates to the technical field of energy absorption systems, in particular to a windmill-shaped thin-walled tube structure capable of realizing multi-dimensional self-locking, which is easy to assemble and has important significance in the aspects of aerospace, transportation and anti-collision and shock absorption of important facilities.
Background
In recent years, with the rapid development of transportation vehicles such as airplanes, vehicles, ships and the like, safety accidents caused by collision and impact are greatly increased, and the safety of lives and property of people is seriously threatened. Therefore, how to design a flexible, convenient and fast impact-resistant energy-absorbing system with excellent mechanical properties according to the loaded characteristics of the structure becomes a research hotspot in the field of impact energy absorption.
Thin-walled tubular structures have been widely used for impact protection and energy absorption because of their advantages of easy processing, low cost, stable deformation, long deformation stroke, low initial peak force, etc. Therefore, most of the common impact-resistant energy-absorbing systems in daily life are formed by assembling a plurality of rows of round pipes.
However, under the condition of no external constraint, when an energy absorption system consisting of a plurality of rows of round pipes bears impact load, the round pipes can transversely splash, the energy absorption efficiency is greatly reduced, and secondary damage can be seriously caused. In engineering, baffles with extra high strength are usually installed at the boundary of a circular tube system, or a fixing device is added between circular tubes to restrict relative movement between the circular tubes, so that transverse splashing is avoided. However, both of these methods increase the installation time and labor cost to different degrees, and cannot quickly and conveniently cope with an accident. To address this deficiency of round tube systems, dumbbell-shaped thin-walled tube structures have been proposed previously, which reduce the time and labor costs of disassembly and assembly, but which can only handle impacts in a particular direction.
Therefore, it is a significant task to design an energy absorption system which can cope with the impact in any direction of space, is easy to assemble and disassemble, and is economical and practical. The method has important value for improving the material utilization rate, rapidly and efficiently dealing with sudden accidents and reducing the loss of lives and properties to the maximum extent.
Disclosure of Invention
The invention aims to provide an energy absorption system which can be assembled easily and has a multi-dimensional self-locking windmill-shaped thin-walled tube structure.
The technical scheme adopted by the invention is as follows: the utility model provides a but windmill form thin wall tubular structure of multidimension auto-lock easily assembles energy-absorbing system which characterized in that: each windmill-shaped thin-walled tube substructure consists of four blades, the cross section of each blade is formed by connecting two parallel straight lines through circular arcs with a central angle of 270 degrees, the whole substructure presents a central symmetry characteristic, a plurality of windmill-shaped thin-walled tube substructures are arranged in a staggered mode to form a multi-row and multi-column combined structure, and the self-locking effect of the two adjacent rows and two columns of structures can be achieved in the impact process;
the width w of the thin plate of the thin-wall pipe substructure is narrower, and the radius r of the thin-wall circular pipe meets the condition that w is more than or equal to 2 r;
the axial total length l of the thin-wall pipe substructure and the radius r of the thin-wall circular pipe meet that l is more than or equal to 9 r;
in order to ensure that the outer curved surface is continuous and smooth, the thin-wall pipe is divided into structures, chamfering is needed at the angular points, and the radius p of the chamfering and the radius r of the thin-wall circular pipe meet the condition that p is less than or equal to r;
furthermore, the windmill-shaped thin-walled tube sub-structures can be arranged to form an energy absorption system without installing a restraint device on the outside or processing a connecting device on the inside.
Furthermore, the radius r of the round pipe and the thickness t of the thin-wall pipe in the thin-wall pipe substructure meet the condition that r/t is more than 5.
Furthermore, when the windmill-shaped thin-wall pipe sub-structures are assembled into the multi-dimensional self-locking energy absorption system, only the circular pipes of all the sub-structures need to be ensured to face the same direction and be clockwise or anticlockwise.
The principle of the invention is as follows:
the energy absorbing system is a combined structure formed by a plurality of windmill-shaped thin-walled tubes made of metal materials in a staggered arrangement mode. Each substructure consists of four blades, the cross section of each blade is formed by connecting two parallel straight lines through circular arcs with a central angle of 270 degrees, and the whole substructure presents a centrosymmetric characteristic. The shape proportion of the windmill-shaped thin-walled tube enables the two adjacent rows and two adjacent columns of structures to achieve the self-locking effect in the process of impact in any direction. The number and the layer number of the windmill-shaped thin-walled tubes placed on each layer can be flexibly adjusted according to the energy of the impact object and the actual situation of the field.
Compared with the prior art, the invention has the advantages that:
1. the windmill-shaped thin-walled tube structure capable of realizing multi-dimensional self-locking can be easily assembled into an energy absorption system, can realize self-locking in the impact process in any direction of space, namely, a restraint device does not need to be arranged outside or a connecting device does not need to be processed inside, and has stronger economical efficiency.
2. The windmill-shaped thin-walled tube structure capable of realizing multi-dimensional self-locking is easy to assemble and absorb energy, the structure is easy to disassemble and assemble, a positioning device is not needed among all sub-structures in the assembling process, the installation is not technically difficult, the time consumption is low, and the impact resistance requirement in emergency can be met.
3. The invention relates to an energy absorption system capable of being assembled easily by a multi-dimensional self-locking windmill-shaped thin-walled tube structure, which consists of a plurality of windmill-shaped thin-walled tube sub-structures, can increase and decrease the number and the number of layers of the windmill-shaped thin-walled tube sub-structures according to the actual requirements of impact energy, fields and the like, can adjust the scale of the space multi-dimensional self-locking energy absorption system at any time, and has good flexibility and adjustability.
Drawings
Fig. 1 is a schematic view of a combined structure according to the present invention.
Fig. 2 is a schematic cross-sectional view of a composite structure according to the present invention.
Fig. 3 is a schematic view of the structure of a single pinwheel thin-walled tube according to the present invention.
FIG. 4 is a schematic diagram of a single pinwheel thin-walled tube with a front and back cross section chamfered in a split configuration according to the present invention.
Fig. 5 is a schematic diagram of the composite structure before lateral load deformation in the numerical simulation of example 1 according to the present invention.
Fig. 6 is a schematic diagram of the composite structure after lateral load deformation in the numerical simulation of example 1 according to the present invention.
Fig. 7 is a schematic diagram of a lateral load energy displacement curve of a composite structure in numerical simulation according to example 1 of the present invention.
Fig. 8 is a schematic view of the composite structure before longitudinal load deformation in the numerical simulation of example 2 according to the present invention.
Fig. 9 is a schematic view of the composite structure after longitudinal load deformation in the numerical simulation of example 2 according to the present invention.
Fig. 10 is a schematic diagram of a longitudinal load energy displacement curve of a composite structure in numerical simulation according to example 2 of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The invention relates to a multidimensional self-locking windmill-shaped thin-walled tube structure easy-assembly energy absorption system, which is a combined structure formed by arranging a plurality of windmill-shaped thin-walled tubes made of metal materials as shown in figure 1;
in order to achieve the expected self-locking effect, when the windmill-shaped thin-walled tube sub-structures are assembled into the spatial multi-dimensional self-locking energy absorption system, only the circular tubes of all the sub-structures need to be ensured to face the same direction, clockwise or anticlockwise, as shown in fig. 2, and the circular tubes of all the sub-structures face the same direction.
In order to achieve the expected self-locking effect, the size can be freely selected in a proportional range according to the requirement, and the requirements that the radius r of a round pipe and the thickness t of the thin-wall pipe in a thin-wall pipe substructure meet r/t & gt 5, and the width w of a thin plate of the thin-wall pipe substructure and the radius r of the thin-wall round pipe meet w & gt 2r are met;
example 1: lateral bearing condition analysis of windmill-shaped thin-walled tube structure easy-to-assemble energy absorption system capable of realizing multi-dimensional self-locking
And calculating the lateral bearing energy absorption effect of the corresponding multi-dimensional self-locking energy absorption system through simulation. The 36 windmill-shaped thin-wall pipes are arranged in a staggered mode to form a 6-row and 6-column combined structure. The individual substructure parameters are as follows: the radius r of the thin-wall round tube is 10mm, the width w of the narrow thin plate is 20mm, the chamfer radius p is 10mm, the thickness t is 0.5mm, and the axial length l is 367 mm. Dynamic simulations were performed using ABAQUS/Explicit.
Setting the speed per hour of the impact object as 72km/h as 20m/s, the mass m of the impact object as 133kg, and calculating the impact energy E as 1/2mv2＝1/2×133×202J＝2.66×104J. Obtaining a force-displacement curve according to numerical simulation, obtaining the energy absorbed by the composite structure through integration, and referring to the energy displacement curve laterally carried by the composite structure shown in the attached figure (figure 7), obtaining that the maximum energy absorbed is Emax＝2.41×104J, absorbs 90.6% of the total impact energy. If the traditional circular tube is adopted, under the constraint of the same boundary condition, the circular tube is directly scattered and irregularly splashed, and the capacity of absorbing energy is very small and can be ignored.
Example 2: longitudinal bearing condition analysis of windmill-shaped thin-walled tube structure easy-to-assemble energy absorption system capable of realizing multi-dimensional self-locking
And calculating the energy absorption effect of the corresponding multi-dimensional self-locking energy absorption system which is installed by simulation. The 36 windmill-shaped thin-wall pipes are arranged in a staggered mode to form a 6-row and 6-column combined structure. The individual substructure parameters are as follows: the radius r of the thin-wall round tube is 10mm, the width w of the narrow thin plate is 20mm, the chamfer radius p is 10mm, the thickness t is 0.5mm, and the axial length l is 367 mm. Dynamic simulations were performed using ABAQUS/Explicit.
The speed per hour of the impact object is set to be 144km/h 40m/s, and the mass of the impact object is set to be 266 kg. The total impact energy E is calculated to be 1/2mv2＝1/2×266×402J＝2.128×105J. Obtaining a force-displacement curve according to numerical simulation, obtaining the energy absorbed by the combined structure through integration, and referring to the energy displacement curve longitudinally carried by the combined structure shown in the attached figure (figure 10), knowing that the maximum energy absorbed is Emax＝2.05×105J, 96.33% of the total impact energy is absorbed. If the traditional circular tube is adopted, under the constraint of the same boundary condition, the circular tube is directly scattered and irregularly splashed, and the capacity of absorbing energy is very small and can be ignored.
The self-locking energy absorption system has the advantages that the energy absorption capacity is mainly determined by the geometric structure and the geometric dimension, and under the condition of keeping the structure of the windmill-shaped section unchanged, the structure dimension can be properly adjusted within the specified proportion range of the invention without changing the self-locking effect of the self-locking energy absorption system.
The invention has not been described in detail and is within the skill of the art.
The above description is only a part of the embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (2)
1. The utility model provides a but windmill form thin wall tubular structure of multidimension auto-lock easily assembles energy-absorbing system which characterized in that: each windmill-shaped thin-walled tube substructure consists of four blades, the cross section of each blade is formed by connecting two parallel straight lines through circular arcs with a central angle of 270 degrees, the whole substructure presents a central symmetry characteristic, a plurality of windmill-shaped thin-walled tube substructures are arranged in a staggered mode to form a multi-row and multi-column combined structure, and the self-locking effect of the two adjacent rows and two columns of structures can be achieved in the impact process;
the width w of the thin-wall tube sub-structure flat plate and the radius r of the thin-wall circular tube meet that w is more than or equal to 2 r;
the axial total length l of the thin-wall pipe substructure and the radius r of the thin-wall circular pipe meet that l is more than or equal to 9 r;
the radius r of the round pipe and the thickness t of the thin-wall pipe in the thin-wall pipe substructure meet the condition that r/t is more than 5;
in order to ensure that the outer curved surface is continuous and smooth, the thin-wall pipe is divided into structures, chamfering is needed at the angular points, and the radius p of the chamfering and the radius r of the thin-wall circular pipe meet the condition that p is less than or equal to r;
the windmill-shaped thin-walled tube sub-structures can be arranged to form an energy absorption system without installing a constraint device outside or processing a connecting device inside;
the thickness and the material of each windmill-shaped thin-wall single tube in the windmill-shaped thin-wall tube system can be independently designed, so that the mechanical response of the system is controlled, and different energy absorption performances are realized.
2. The energy absorbing system capable of being assembled easily with the multi-dimensional self-locking windmill-shaped thin-walled tube structure according to claim 1, is characterized in that: when the windmill-shaped thin-wall pipe sub-structures are assembled into the multi-dimensional self-locking energy absorption system, the circular pipes of all the sub-structures only need to be ensured to face the same direction and be clockwise or anticlockwise.
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| CN114857193B (en) * | 2022-04-19 | 2023-04-14 | 福建工程学院 | Clamping groove type thin-walled tube energy absorption system easy to disassemble and assemble and capable of achieving three-dimensional self-locking |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003320423A (en) * | 2002-05-08 | 2003-11-11 | National Institute Of Advanced Industrial & Technology | Impact energy absorbing structure |
| CN103398122A (en) * | 2013-08-05 | 2013-11-20 | 北京航空航天大学 | Easily-assembled self-locking energy-absorbing device of dumbbell-shaped thin-walled-tube structure |
| CN107687497A (en) * | 2016-08-05 | 2018-02-13 | 李洋 | One kind has concave polygon section and one end band energy-absorption box creasy |
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| CN105774052B (en) * | 2016-03-16 | 2018-02-02 | 邓安仲 | The core filled composite material of multiple-layer stacked curved surface scapus born of the same parents' structure |
| US10423734B2 (en) * | 2016-05-03 | 2019-09-24 | Hamid Reza Abbasi | Method for determining filler types for press bending of pipes |
| CN108397501B (en) * | 2018-03-01 | 2019-12-03 | 重庆大学 | A kind of comprehensive self-locking thin-walled energy-absorbing socket |
| CN109305120B (en) * | 2018-03-07 | 2020-07-24 | 华中科技大学 | Assembled self-locking multi-cell energy absorber |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003320423A (en) * | 2002-05-08 | 2003-11-11 | National Institute Of Advanced Industrial & Technology | Impact energy absorbing structure |
| CN103398122A (en) * | 2013-08-05 | 2013-11-20 | 北京航空航天大学 | Easily-assembled self-locking energy-absorbing device of dumbbell-shaped thin-walled-tube structure |
| CN107687497A (en) * | 2016-08-05 | 2018-02-13 | 李洋 | One kind has concave polygon section and one end band energy-absorption box creasy |
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