CN115447629B - Multi-pipe combined energy absorbing device with different heights and ripple phases - Google Patents
Multi-pipe combined energy absorbing device with different heights and ripple phases Download PDFInfo
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- CN115447629B CN115447629B CN202211167260.9A CN202211167260A CN115447629B CN 115447629 B CN115447629 B CN 115447629B CN 202211167260 A CN202211167260 A CN 202211167260A CN 115447629 B CN115447629 B CN 115447629B
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- 238000007789 sealing Methods 0.000 claims abstract description 3
- 239000006096 absorbing agent Substances 0.000 claims description 12
- 238000003466 welding Methods 0.000 claims description 3
- 238000010521 absorption reaction Methods 0.000 description 9
- 238000006073 displacement reaction Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 5
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 5
- 238000007906 compression Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000000418 atomic force spectrum Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003631 expected effect Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61F—RAIL VEHICLE SUSPENSIONS, e.g. UNDERFRAMES, BOGIES OR ARRANGEMENTS OF WHEEL AXLES; RAIL VEHICLES FOR USE ON TRACKS OF DIFFERENT WIDTH; PREVENTING DERAILING OF RAIL VEHICLES; WHEEL GUARDS, OBSTRUCTION REMOVERS OR THE LIKE FOR RAIL VEHICLES
- B61F19/00—Wheel guards; Bumpers; Obstruction removers or the like
- B61F19/04—Bumpers or like collision guards
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Vibration Dampers (AREA)
Abstract
The invention discloses a multi-tube combined energy absorbing device with different heights and ripple phases, which comprises a thin-wall shell with an inner cavity, a plurality of energy absorbing corrugated tubes arranged in the inner cavity, and a front end plate for sealing the inner cavity, wherein each energy absorbing corrugated tube has different heights, and the ripple curve of the side wall of each energy absorbing corrugated tube meets the following conditionsWherein i is the serial number of the energy absorbing corrugated pipe; the side wall of each energy-absorbing corrugated pipe is provided with a wave crest and a wave trough, and the wave crests and the wave troughs between two adjacent energy-absorbing corrugated pipes are arranged in a staggered manner; the initial peak load originally concentrated is separated by introducing the height difference configuration characteristic to enable the energy-absorbing corrugated pipes to be misplaced during initial deformation, so that the initial peak load of the whole device can be greatly reduced; the introduction of the corrugated phase difference configuration features changes the positions of the peaks and the troughs of the side wall sinusoidal curves, so that different pipe fittings compensate each other during deformation, and the subsequent load peaks of each pipe are fully separated, thereby obviously reducing the subsequent load fluctuation of the combined structure.
Description
Technical Field
The invention relates to the field of vehicle collision safety, in particular to a multi-pipe combined energy absorbing device with different heights and ripple phases.
Background
Along with the continuous improvement of the speed of the high-speed railway, the requirements on train safety are also higher and higher. The train collision is a serious accident, and the energy absorption protection device arranged on the train can protect the life and property safety of people at the first time. The thin-walled circular tube structure can absorb a large amount of energy when impacted, so as to absorb the impact caused by the impact. Although the energy absorption capacity of the energy absorption protection device can be improved by times by simply superposing the number of the pipe fittings, the energy absorption protection device has problems such as an initial load peak value, excessive load fluctuation and the like, and the problems can not well protect the life and property safety of people when accidents happen, so that unnecessary losses are caused.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects of the prior art and providing a multi-tube combined energy absorbing device with high energy dissipation, low initial peak value and small load fluctuation and different heights and ripple phases.
In order to solve the technical problems, the invention adopts the following technical scheme: a multi-tube combined energy absorbing device with different heights and ripple phases comprises a thin-wall shell with an inner cavity, a plurality of energy absorbing corrugated tubes arranged in the inner cavity, and a front end plate for sealing the inner cavity, wherein each energy absorbing corrugated tube has different heights;
the corrugated curve of the side wall of each energy-absorbing corrugated pipe meets the following conditions Wherein i is the serial number of the energy-absorbing corrugated pipe; the side wall of each energy-absorbing corrugated pipe is provided with a wave crest and a wave trough, and the wave crests and the wave troughs between two adjacent energy-absorbing corrugated pipes are arranged in a staggered mode.
As a further improvement of the above technical scheme:
The energy absorbing corrugated pipes are arranged in the inner cavity from high to low or from low to high at equal intervals.
The corrugated energy absorbing pipes are arranged in the inner cavity in multiple rows.
The energy-absorbing corrugated pipe is fixed in the inner cavity through welding.
The diameter of the bottom of the energy-absorbing corrugated pipe is 40mm, and the wall thickness is 2mm.
Compared with the prior art, the invention has the advantages that:
According to the multi-pipe combined energy absorbing device with different heights and ripple phases, the height difference configuration characteristics are introduced to enable the plurality of energy absorbing corrugated pipes to be dislocated in initial deformation, initial peak loads of the energy absorbing corrugated pipes are controlled to be compactly distributed at different time nodes, initial peak loads concentrated originally are separated, and the initial peak loads of the whole device can be greatly reduced; the positions of the peaks and the troughs of the side wall sinusoidal curves are changed by introducing the configuration features of the corrugated phase difference, the positions of the peaks and the troughs determine time nodes of fold deformation, the time nodes of fold deformation determine time nodes of subsequent peak loads, the whole device can be deformed by endowing each pipe with proper and different phases of corrugations, different pipe fittings can be mutually compensated in deformation at any moment, subsequent load peaks of each pipe are fully separated, thus the subsequent load fluctuation of a combined structure is obviously reduced, and the multi-pipe combined energy absorber has an impact force curve which is as stable as a honeycomb structure, so that perfect compatibility of excellent energy absorption characteristics such as high energy dissipation, low initial peak value, small load fluctuation and the like is realized.
Drawings
FIG. 1 is a schematic perspective view of a multi-tube combined energy absorber of the present invention.
FIG. 2 is a schematic perspective view of an arrangement of six energy absorbing bellows of the present invention.
Fig. 3 is a schematic perspective view of a typical uniformly distributed bellows (single or multiple high-level energy absorbing bellows).
FIG. 4 is a schematic view of a layout of a plurality of energy absorbing bellows of different heights according to the present invention.
Fig. 5 is a schematic diagram of a typical bellows compression stage (correlation between crest value, trough value, and pleat formation).
FIG. 6 is a graph of the expected effect of the multi-tube combined energy absorber of the present invention in combination with a height difference and a phase difference when subjected to a force.
Fig. 7 is a load-displacement schematic of the tubulars when only a level difference configuration is introduced.
Fig. 8 is a load-displacement schematic of each tubular when only the wave curve phase difference configuration is introduced.
Fig. 9 is a schematic diagram of load-displacement of each tube when the height difference and the ripple phase difference are simultaneously introduced.
FIG. 10 is a comparative schematic illustration of the result of a differently configured six-tube energy absorber device of the present invention versus a conventional six-tube energy absorber device of the same configuration.
FIG. 11 is a schematic diagram showing the impact performance comparison between a six-tube energy absorber of different configurations according to the present invention and a conventional six-tube energy absorber of the same configuration.
The reference numerals in the drawings denote:
1. a front end plate; 2. an energy absorbing bellows; 3. a thin-walled housing; 31. an inner cavity; a 1-A6, six energy-absorbing corrugated pipes.
Detailed Description
The invention will be described in further detail with reference to the drawings and the specific examples.
FIGS. 1-11 illustrate one embodiment of a multi-tube combined energy absorber device of the present invention having different heights and ripple phases, comprising a thin-walled housing 3 having an inner cavity 31, a plurality of energy absorbing bellows 2 disposed within the inner cavity 31, a front end plate 1 covering the inner cavity 31, the plurality of energy absorbing bellows 2 each having a different height; the corrugated curve of the side wall of each energy-absorbing corrugated pipe 2 meets the following conditionsWherein i is the serial number of the energy-absorbing corrugated pipe 2; the side walls of the energy-absorbing corrugated pipes 2 are provided with wave crests and wave troughs, and the wave crests and the wave troughs between two adjacent energy-absorbing corrugated pipes 2 are arranged in a staggered mode.
According to the multi-pipe combined energy absorbing device, the height difference configuration characteristic is introduced to enable the plurality of energy absorbing corrugated pipes 2 to be dislocated in initial deformation, initial peak loads of the energy absorbing corrugated pipes 2 are controlled to be compactly distributed at different time nodes, the initial peak loads which are originally concentrated are separated, and the initial peak load of the whole device can be greatly reduced; the positions of the peaks and the troughs of the side wall sinusoidal curves are changed by introducing the corrugated phase difference configuration features, the positions of the peaks and the troughs determine time nodes of fold deformation, the time nodes of fold deformation determine time nodes of subsequent peak loads, the whole device can be deformed by endowing each pipe with appropriate different phases of corrugations, different pipe fittings can be mutually compensated in deformation at any moment, subsequent load peaks of each pipe are fully separated, thus the subsequent load fluctuation of a combined structure is obviously reduced, and the multi-pipe combined energy absorber has an impact force curve which is as smooth as a honeycomb structure, so that perfect compatibility of excellent energy absorption characteristics such as high energy dissipation, low initial peak value, small load fluctuation and the like is realized (as shown in fig. 6).
In this embodiment, taking six energy absorbing bellows 2 ((a 1-A6) as an example, six corrugated energy absorbing bellows are arranged in two rows at a proper distance in equal distance in the inner cavity 31:
TABLE 1
H i is the height of each pipe fitting, deltaH is the height difference between the pipe fittings, the diameter D of each pipe fitting bottom circle is 40mm, and the wall thickness T is 2mm.
In this embodiment, the energy absorbing bellows 2 is secured within the inner cavity 31 by welding.
The energy-absorbing corrugated pipe 2 selected in this embodiment has weak structure at the positions of the peaks and the troughs of the sinusoidal curves on the side wall, and can be used as a deformation induction structure, so that the deformation time sequence of the pipe fitting can be controlled by controlling the positions of the peaks and the troughs in the pipe fitting, as shown in fig. 6, the pipe fitting has different heights and corrugated phases, and the deformation initiation and duration of the folds of the pipe fitting have different configuration characteristics in the compression process, so that a certain time sequence difference is generated between the load-displacement curves of the pipe fitting, namely the peak load of the pipe fitting is fully separated.
As shown in fig. 5, which is a typical bellows compression stage diagram, the peak load on the load-displacement curve is closely related to the corrugation forming process, and each deformed corrugation means that the load curve has corresponding peak and trough values. Because the configuration characteristics of the energy-absorbing corrugated pipe 2 are directly related to the deformation process of the folds, the purpose of controlling the peak load forming time sequence of the energy-absorbing pipe fitting according to actual requirements can be obviously achieved by endowing the energy-absorbing corrugated pipe 2 with proper configuration characteristics, the research of the existing multi-pipe combined energy-absorbing device is mainly based on the same configuration expansion, and the load curves of all the energy-absorbing corrugated pipes 2 can be completely overlapped in the combined energy-absorbing process. Although the energy dissipation capacity of the whole device is obviously improved after the direct combined application, the initial peak value and the subsequent load fluctuation of the combined structure are also obviously increased along with the number of the pipe fittings, which is obviously unfavorable for the stable dissipation of the impact kinetic energy.
Fig. 7 shows the load-displacement diagram of each tube when only a level difference configuration is introduced, and it can be found that although a certain time sequence difference is formed between the initial peak loads of each tube, the subsequent peak loads of each tube still have obvious overlapping phenomenon, and the goal of small load fluctuation cannot be obviously achieved.
Fig. 8 shows a load-displacement plot of each tube while only introducing a wave curve phase difference configuration, and it can be seen that the initial peak loads of each tube are fully overlapped despite the effective separation of the subsequent peak loads of each tube, obviously making it difficult to achieve the goal of a small initial peak load.
Fig. 9 shows a graph of load versus displacement for each tube while introducing both a height difference and a ripple phase difference, and it can be seen that all peak loads for each tube are sufficiently separated to minimize subsequent load fluctuations of the composite structure while maintaining a small initial load peak.
FIG. 10 shows the results of the six-tube combined energy absorbing device of the present invention in different configurations compared to a conventional six-tube combined energy absorbing device of the same configuration, and it can be found that the initial peak load and load fluctuations are significantly reduced without substantially reducing the energy absorbing capacity of the device, which is obviously more advantageous for protecting the safety of the occupant.
Fig. 11: the impact performance comparison of a conventional six-tube energy absorber of the same configuration and a six-tube energy absorber of a different configuration of the present invention is shown with specific data, where P 1 is the initial peak load, E d is the energy absorption, SEA is the specific energy absorption, fm is the average load, and FLU 0-100 is the load fluctuation. As can be seen by specific data comparison, compared with the traditional six-tube energy-absorbing device with the same configuration, the six-tube energy-absorbing device with different configurations provided by the invention has the advantages that under the condition that the energy-absorbing energy E d is reduced by 5.43% and the energy-absorbing SEA is reduced by 3.72%, the initial peak load P 1 is reduced by 28.76%, and the load fluctuation FLU 0-100 is reduced by 65.74%.
In this embodiment, only six energy-absorbing corrugated pipes 2 with different configurations are provided for energy absorption, and of course, the number i of the pipes, the initial height H 0 of the pipes, the height difference Δh, the amplitude a and the phase of the corrugated curve can be reasonably adjustedThe frequency a and other structural parameters are suitable for various complex application situations, so that the design target of reducing initial peak load and subsequent load fluctuation of the combined structure to the greatest extent under the condition of meeting energy dissipation capacity is realized.
While the invention has been described in terms of preferred embodiments, it is not intended to be limiting. Many possible variations and modifications of the disclosed technology can be made by anyone skilled in the art, or equivalent embodiments with equivalent variations can be made, without departing from the scope of the invention. Therefore, any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present invention shall fall within the scope of the technical solution of the present invention.
Claims (2)
1. A multitube combination formula energy-absorbing device with different height and ripple phase place, its characterized in that: the energy-absorbing corrugated pipe comprises a thin-wall shell (3) with an inner cavity (31), a plurality of energy-absorbing corrugated pipes (2) arranged in the inner cavity (31) and a front end plate (1) for sealing the inner cavity (31), wherein the energy-absorbing corrugated pipes (2) have different heights;
the ripple curve of the side wall of each energy-absorbing corrugated pipe (2) meets y=sin (0.3x+phi i), wherein i is the serial number of the energy-absorbing corrugated pipe (2); the side walls of the energy-absorbing corrugated pipes (2) are provided with wave crests and wave troughs, and the wave crests and the wave troughs between two adjacent energy-absorbing corrugated pipes (2) are arranged in a staggered mode;
The energy-absorbing corrugated pipes (2) are arranged in the inner cavity (31) from high to low or from low to high at equal intervals;
the energy-absorbing corrugated pipes (2) are arranged in the inner cavity (31) in multiple rows;
the energy-absorbing corrugated pipe (2) is fixed in the inner cavity (31) through welding.
2. A multi-tube combined energy absorber device having different heights and ripple phases according to claim 1, wherein: the diameter of the bottom of the energy-absorbing corrugated pipe (2) is 40mm, and the wall thickness is 2mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211167260.9A CN115447629B (en) | 2022-09-23 | 2022-09-23 | Multi-pipe combined energy absorbing device with different heights and ripple phases |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211167260.9A CN115447629B (en) | 2022-09-23 | 2022-09-23 | Multi-pipe combined energy absorbing device with different heights and ripple phases |
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| CN115447629A CN115447629A (en) | 2022-12-09 |
| CN115447629B true CN115447629B (en) | 2024-08-23 |
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| CN116066496B (en) * | 2023-01-10 | 2024-07-16 | 广州大学 | Energy-absorbing pipe with curved surface is crease in advance |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104462731A (en) * | 2015-01-07 | 2015-03-25 | 湖南大学 | Method for designing sinusoidal corrugated energy absorption tube |
| CN114454911A (en) * | 2022-03-25 | 2022-05-10 | 中南大学 | Multi-tube combined energy absorption device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2315039A1 (en) * | 1975-06-20 | 1977-01-14 | Berliet Automobiles | ENERGY ABSORPTION DEVICE, ESPECIALLY FOR VEHICLES |
| JP2003054442A (en) * | 2001-08-16 | 2003-02-26 | Nippon Light Metal Co Ltd | Shock absorbing body |
| JP2012107660A (en) * | 2010-11-16 | 2012-06-07 | Hitachi Ltd | Energy absorber, collision energy absorbing structure having the same, and railroad vehicle having the collision energy absorbing structure |
| CN109291951B (en) * | 2018-10-22 | 2019-09-27 | 中车青岛四方车辆研究所有限公司 | A kind of close-coupled anti-climbing energy-absorbing device |
| CN109159795B (en) * | 2018-10-23 | 2019-09-13 | 中南大学 | More born of the same parents' energy absorption devices and its application method, the rail traffic vehicles with it |
| CN114962511B (en) * | 2022-06-07 | 2023-04-21 | 江苏科技大学 | Double-tube thin-wall energy-absorbing structure containing shear thickening fluid and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104462731A (en) * | 2015-01-07 | 2015-03-25 | 湖南大学 | Method for designing sinusoidal corrugated energy absorption tube |
| CN114454911A (en) * | 2022-03-25 | 2022-05-10 | 中南大学 | Multi-tube combined energy absorption device |
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