CN110263454B - Multi-dimensional self-locking thin-wall ball string energy absorption system - Google Patents
Multi-dimensional self-locking thin-wall ball string energy absorption system Download PDFInfo
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- CN110263454B CN110263454B CN201910555727.9A CN201910555727A CN110263454B CN 110263454 B CN110263454 B CN 110263454B CN 201910555727 A CN201910555727 A CN 201910555727A CN 110263454 B CN110263454 B CN 110263454B
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Abstract
The invention discloses a multi-dimensional self-locking thin-wall ball string energy absorption system, which is a thin-wall ball string structure made of metal materials, wherein a combined structure is formed by staggered arrangement of a plurality of thin-wall ball string sub-structures, and each thin-wall ball string sub-structure is formed by connecting a thin and long thin-wall circular tube in series with a plurality of equally-spaced thin-wall balls. According to the invention, through the structural design of the thin-wall ball strings, self-locking among the branch structures of each thin-wall ball string 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 restraining device externally or a connecting device internally is processed is overcome, the manpower and material cost and the time cost of assembly and disassembly are greatly reduced, the defect that a dumbbell-shaped thin-wall pipe energy absorption system can only deal with the self-locking of 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 among the structures, and the impact energy can be effectively absorbed. According to the impact energy and the actual situation of the field, the number and the layer number of the thin-wall ball string substructures placed 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 multi-dimensional self-locking thin-wall ball string energy absorption system which is suitable for an anti-impact shock absorption protection system of vehicles, trains and other vehicles, spacecrafts, air-dropped articles or an anti-explosion impact protection system of nuclear energy facilities.
Background
Accidents such as collision, impact and explosion can cause the structure to be damaged under the action of strong impact load, so that serious life and property loss is caused, so how to put forward a reasonable design scheme and make fixed or temporary installation effective protection measures according to the overall performance of the structure after impact, and designing an impact-resistant energy-absorbing device with excellent performance becomes a hot problem in structural safety protection.
Under the design concept of introducing buffering and energy absorption mechanisms, the metal ring structure is practically applied to engineering application and national defense engineering and obtains good economic and social benefits by the advantages of stable deformation, high specific energy consumption, stable bearing capacity, long deformation stroke, small initial impact force, convenient material taking, easy replacement and the like. Therefore, the impact-resistant energy-absorbing device in the existing design is mostly assembled by a plurality of rows of round tubes.
However, during impact, the lateral splashing of the pipe reduces the energy absorption efficiency and may cause secondary damage. To overcome this drawback, two methods are generally adopted in engineering: firstly, mounting a fixed baffle with high strength at the boundary of the circular tube array to restrain the transverse expansion of the circular tube array; secondly, the circular tubes are fixed by welding or bolts, and the relative movement between the circular tubes is restrained. However, both of these approaches add to varying degrees time and labor costs to the installation, and are not ideal, particularly in emergency situations and the like. In order to overcome the defect of the flexibility of a round tube system, a self-locking dumbbell-shaped thin-walled tube structure is proposed previously, the system can form an energy absorption device through staggered arrangement, a boundary constraint and a connecting device are not needed, the system can deal with specific unidirectional impact, and splashing can still be generated when the system is dealt with impact in other directions.
Therefore, an energy absorption structure which can cope with the impact in any direction of the space and is convenient to disassemble and assemble is found, the impact protection in any direction of the space can be coped with, the material, time and labor cost of disassembly and assembly can be reduced, an impact-resistant protection system can be quickly and efficiently set up according to the requirement, the energy absorption structure is a significant work, and the energy absorption structure has important values for improving the material utilization rate, quickly setting up the impact-resistant protection system and reducing the loss of lives and properties.
Disclosure of Invention
The invention aims to provide a multi-dimensional self-locking thin-wall ball string energy absorption system, which is an energy absorption device which is easy to disassemble and assemble, is economical and practical, and provides more convenient, rapid, economical and safe guarantee for protecting against impact collision and explosion.
The technical scheme adopted by the invention is as follows: the utility model provides a thin wall ball cluster energy-absorbing system of multidimension degree auto-lock which characterized in that: the thin-wall ball string structure is formed by connecting a long thin-wall round pipe in series with a plurality of equally-spaced thin-wall balls, and a plurality of thin-wall ball string structures are arranged in a staggered manner in a horizontal-vertical layered mode to form a multi-row and multi-column combined structure, so that the self-locking effect of the adjacent two-row structure in the impact process is achieved;
the outer diameter D of the round ball and the outer diameter D of the round pipe in the thin-wall ball string structure meet the condition that D/D is more than or equal to 5;
the center distance l between adjacent round balls in the thin-wall ball string structure, the outer diameter D of the round balls and the outer diameter D of the round pipe meet the requirements
The axial total length L, the center distance L and the number N of the spheres of the thin-wall sphere string structure meet the condition that L is (N-1) L + D;
furthermore, the staggered arrangement of the thin-wall ball string sub-structures can be arranged to form an energy absorption system without installing a restraint device at the outside or adding a connecting device at the inside.
The principle of the invention is as follows:
the utility model provides a thin wall ball cluster energy-absorbing system of multidimension degree auto-lock, wholly for the integrated configuration that a plurality of thin wall ball clusters of metal material made are crisscross range of horizontal and vertical layering. Each thin-wall ball string is formed by connecting a long thin-wall round pipe in series with a plurality of equally-spaced thin-wall balls, the combined structure is formed by arranging a plurality of thin-wall ball strings in a staggered mode, the shape proportion of the thin-wall ball strings enables two adjacent rows of structures to be locked with each other in a locked mode, and the self-locking effect is achieved in the impact process in any direction. The number and the number of layers of the thin-wall ball strings placed on each layer can be flexibly adjusted according to the impact energy and the actual situation of the field.
Compared with the prior art, the invention has the advantages that:
1. according to the multi-dimensional self-locking thin-wall ball string energy absorption system, no boundary constraint or reinforcing fastener is needed, self-locking can be achieved in the impact process in any direction of space, the cost of manpower and material resources for applying constraint or reinforcing the fastener is saved, and the economical efficiency is high.
2. The multidimensional self-locking thin-wall ball string energy absorption system is easy to disassemble and assemble, positioning devices are 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 a multi-dimensional self-locking thin-wall ball string energy absorption system which is composed of a plurality of thin-wall ball string sub-structures, the number of the thin-wall ball string sub-structures can be increased or decreased according to the actual requirements of impact energy, fields and the like, the scale of a multi-directional self-locking energy absorption device can be adjusted at any time, and the multi-dimensional self-locking thin-wall ball string energy absorption system 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 diagram of a thin-wall ball string structure according to the present invention.
Fig. 3 is a schematic cross-sectional view of a thin-walled ball string structure according to the present invention through an axis.
FIG. 4 is a schematic view of a composite structure before longitudinal impact in numerical simulation according to example 1 of the present invention.
FIG. 5 is a schematic view of a composite structure subjected to a longitudinal impact in a numerical simulation according to example 1 of the present invention.
Fig. 6 is a schematic diagram of a longitudinal load energy displacement curve of a composite structure in numerical simulation according to example 1 of the present invention.
Fig. 7 is a schematic view of the composite structure before side impact in the numerical simulation of example 2 according to the present invention.
Fig. 8 is a schematic view of the composite structure subjected to a side impact in the numerical simulation of example 2 according to the present invention.
Fig. 9 is a schematic diagram of a lateral 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 thin-wall ball string energy absorption system, which is a combined structure formed by arranging a plurality of thin-wall ball strings made of metal materials as a whole as shown in figure 1;
the thin-wall ball string is of a single sub-structure in a combined structure, all the adjacent thin-wall pipes in the same row are arranged on the same horizontal plane, or transversely or longitudinally, and the round pipes in the adjacent rows are arranged in a transversely and longitudinally staggered manner.
In order to achieve the expected self-locking effect and energy absorption performance, the size can be freely selected in a proportion range according to requirements, and the requirements that the outer diameter D of a round ball and the outer diameter D of a round pipe in a thin-wall pipe division structure meet that D/D is more than or equal to 5, and the central distance l between two adjacent round balls, the outer diameter D of the round ball and the outer diameter D of the round pipe meet
The total axial length L, the center distance L and the number N of the balls satisfy the following conditions: l ═ N-1) L + D.
Example 1: longitudinal bearing condition analysis of multi-dimensional self-locking thin-wall ball string energy absorption system
The energy absorption effect of the corresponding multidirectional self-locking energy absorption device which needs to be installed when the speed per hour v of the impact object is 72km/h is 20m/s and the mass of the impact object is 133kg is calculated through simulation. The selected combined structure is formed by arranging 36 thin-wall tubes imitating the sugarcoated haws in a staggered way in 12 rows. The individual substructure parameters are as follows: the outer diameter D of the round ball is 20mm, the thickness T of the round ball is 0.3mm, the outer diameter D of the round pipe is 1mm, the thickness T of the round pipe is 0.4mm, the number N of the round balls is 3, and the axial length L of the round pipe is 121 mm. Dynamic simulations were performed using ABAQUS/Explicit.
The force-displacement curve is obtained according to numerical simulation, the energy absorbed by the combined structure can be obtained through integration, and the change graph of the absorbed energy E of the combined structure along with the compression displacement U can be referred to in the attached figure 8, so that the system can stably and continuously absorb the energy and does not splash. If the traditional circular tube is adopted, under the same boundary condition constraint, the circular tube is directly scattered, and the energy absorption capacity is very small and can be ignored.
Example 2: analysis of lateral bearing condition of multi-dimensional self-locking thin-wall ball string energy absorption system
The energy absorption effect of the corresponding multidirectional self-locking energy absorption device which needs to be installed when the speed per hour v of the impact object is 72km/h is 20m/s and the mass of the impact object is 133kg is calculated through simulation. The selected combined structure is formed by arranging 36 thin-wall tubes imitating the sugarcoated haws in a staggered way in 12 rows. The individual substructure parameters are as follows: the outer diameter D of the round ball is 20mm, the thickness T of the round ball is 0.3mm, the outer diameter D of the round pipe is 1mm, the thickness T of the round pipe is 0.4mm, the number N of the round balls is 3, and the axial length L of the round pipe is 121 mm. Dynamic simulations were performed using ABAQUS/Explicit.
The force-displacement curve is obtained according to numerical simulation, the energy absorbed by the combined structure can be obtained through integration, and the change graph of the absorbed energy E of the combined structure along with the compression displacement U can be referred to in the attached figure 8, so that the system can stably and continuously absorb the energy and does not splash. If the traditional circular tube is adopted, under the same boundary condition constraint, the circular tube is directly scattered, and the energy absorption capacity is very small and can be ignored.
The capacity of the thin-wall ball string energy absorption system for absorbing energy is mainly determined by a geometric structure and geometric dimensions, and under the condition of keeping the section dimension to be periodically changed, the structural dimension can be properly adjusted within the specified proportion range of the invention, and the self-locking effect of the self-locking energy absorption device is not changed.
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 (3)
1. The utility model provides a thin wall ball cluster energy-absorbing system of multidimension degree auto-lock which characterized in that: the thin-wall ball string structure is formed by connecting a plurality of equally-spaced thin-wall balls in series with a thin-wall round tube, a plurality of thin-wall ball string structures are arranged in a staggered manner transversely and longitudinally to form a multi-row and multi-column combined structure, all adjacent thin-wall round tubes in the same row are arranged on the same horizontal plane, or are arranged transversely or longitudinally, and round tubes in adjacent rows are arranged transversely and longitudinally in a staggered manner, so that the adjacent two-row structure achieves a multi-directional self-locking effect in the impact process;
the section of the thin-wall ball string structure passing through the axis is formed by connecting a plurality of circles with equal intervals through straight lines, and the center distance l between every two adjacent circles is larger than the outer diameter D of the circle.
2. The multidimensional self-locking thin-wall ball string energy absorption system according to claim 1, characterized in that: the staggered arrangement among the thin-wall ball string sub-structures can be randomly arranged to form an energy absorption system without installing a restraint device at the outside or adding a connecting device at the inside.
3. The multidimensional self-locking thin-wall ball string energy absorption system according to claim 1, characterized in that: the outer diameter D of the round ball and the outer diameter D of the round pipe in the thin-wall ball string structure meet that D/D is more than or equal to 5, and the center distance l between two adjacent round balls, the outer diameter D of the round section and the outer diameter D of the round pipe meet
The total axial length L, the center distance L and the number N of the round balls satisfy L ═ N-1L + D.
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| JP7264042B2 (en) * | 2019-12-20 | 2023-04-25 | トヨタ自動車株式会社 | Manufacturing method of shock absorbing member |
| CN113090694B (en) * | 2021-04-16 | 2022-02-18 | 中山大学 | Energy-absorbing protective device capable of being flexibly disassembled and rapidly expanded |
| 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 (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2003320423A (en) * | 2002-05-08 | 2003-11-11 | National Institute Of Advanced Industrial & Technology | Impact energy absorbing structure |
| CN206386431U (en) * | 2017-01-11 | 2017-08-08 | 深圳市乾行达科技有限公司 | A kind of staggered porous energy absorber |
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| CN107451347B (en) * | 2017-07-25 | 2020-06-09 | 中南大学 | Active control method for inducing energy absorption of thin-wall pipe fitting |
| CN109707985A (en) * | 2018-12-06 | 2019-05-03 | 西北工业大学 | Endergonic structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2003320423A (en) * | 2002-05-08 | 2003-11-11 | National Institute Of Advanced Industrial & Technology | Impact energy absorbing structure |
| CN206386431U (en) * | 2017-01-11 | 2017-08-08 | 深圳市乾行达科技有限公司 | A kind of staggered porous energy absorber |
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