CN111883902A - Method and structure for improving rigidity of subway vehicle antenna support - Google Patents
Method and structure for improving rigidity of subway vehicle antenna support Download PDFInfo
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- CN111883902A CN111883902A CN202010945623.1A CN202010945623A CN111883902A CN 111883902 A CN111883902 A CN 111883902A CN 202010945623 A CN202010945623 A CN 202010945623A CN 111883902 A CN111883902 A CN 111883902A
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- 238000000034 method Methods 0.000 title claims abstract description 31
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 105
- 239000010959 steel Substances 0.000 claims abstract description 105
- 229920000049 Carbon (fiber) Polymers 0.000 claims abstract description 69
- 239000004917 carbon fiber Substances 0.000 claims abstract description 69
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 68
- 238000003466 welding Methods 0.000 claims abstract description 16
- 238000003754 machining Methods 0.000 claims abstract description 3
- 238000005452 bending Methods 0.000 abstract description 38
- 230000008569 process Effects 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000005284 excitation Effects 0.000 description 8
- 230000006872 improvement Effects 0.000 description 6
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/27—Adaptation for use in or on movable bodies
- H01Q1/32—Adaptation for use in or on road or rail vehicles
- H01Q1/325—Adaptation for use in or on road or rail vehicles characterised by the location of the antenna on the vehicle
- H01Q1/3291—Adaptation for use in or on road or rail vehicles characterised by the location of the antenna on the vehicle mounted in or on other locations inside the vehicle or vehicle body
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Abstract
The invention discloses a method and a structure for improving the rigidity of an antenna bracket of a subway vehicle, wherein a carbon fiber reinforced pipe is arranged in a steel pipe of the antenna bracket, and the carbon fiber reinforced pipe is tightly attached to the steel pipe, and the method comprises the following specific steps: welding a steel pipe to form a frame of the antenna bracket; machining the inner wall of the steel pipe by using a steel pipe inner wall machine to enable the inner wall of the steel pipe to form a concave-convex surface, wherein the carbon fiber reinforced pipe is tightly attached to the inner wall of the steel pipe and is fixed in the steel pipe through a positioning block; welding the end support to complete the integral assembly of the antenna bracket; the method utilizes the characteristics of high specific modulus and low density of the carbon fiber, improves the bending rigidity of the antenna support under the conditions of not changing the overall dimension of the antenna support and not greatly increasing the structural quality of the antenna support, further improves the bending vibration dominant frequency of the antenna support, solves the problem of antenna support fracture, has simple structural design and mature structural process, and can meet the design and production requirements of the antenna support.
Description
Technical Field
The invention relates to the technical field of railway vehicles, in particular to a method for improving the rigidity of an antenna bracket of a subway vehicle.
Background
The subway vehicle antenna support has the advantages that the subway vehicle antenna support can be broken and failed in the service process, the reason for the problem is that 60Hz main frequency exists in wheel track excitation caused by an elastic track, the wheel track excitation main frequency is coupled with bending main frequency of the antenna support, the structure is vibrated and fatigue fracture occurs due to the coupling vibration of the structure, the vehicle line condition is determined, the rectification difficulty is high, the bending rigidity of the antenna support needs to be improved for avoiding the coupling vibration, the bending vibration main frequency of the antenna support is improved (the bending main frequency is improved to be more than 80 Hz), and the separation of the structural vibration main frequency and the wheel track excitation main frequency is realized.
According to the design thought of the traditional steel structure, if the bending rigidity of the structure is to be improved, the section size of the structure needs to be increased, the section size of the steel structure is increased while the mass of the steel structure is increased, and the dominant frequency of the structural mode is reduced due to the increase of the mass of the steel structure, so that if the bending dominant frequency of more than 80Hz is to be realized, the section size of the steel structure is large according to the design principle of the steel structure, and the mass of the steel structure is increased by more than 1.7 times of that of the original scheme; since the bogie is a key component for vehicle operation, and the end of the bogie frame is the most severely vibrated position on the bogie frame, the increased mass may cause a potential safety hazard to the structure, and therefore, the related mounting seat needs to be improved to adapt to the installation of the large-size and large-mass antenna bracket, which may greatly increase the structural improvement cost. Therefore, the improvement difficulty in the optimization and improvement of the antenna bracket is high by adopting the traditional steel structure optimization, the improvement effect is not ideal, and the improvement cost is high.
The antenna support is a support structure for mounting an antenna device on a metro vehicle bogie, and in a Chinese patent 'an antenna equipment fixing device for a railway vehicle' (patent number CN 201510635173.5), the antenna support is of a pure steel structure, is a beam-shaped support, is limited by factors such as quality and safety, cannot be designed to realize large bending rigidity, comprehensively considers the improvement requirement of the antenna support structure and the structural installation and operation environment, and the design idea of a steel structure in the scheme cannot meet the requirement.
Disclosure of Invention
The invention provides a method for improving the rigidity of an antenna support of a metro vehicle, aiming at the defects of the prior art, the method utilizes the characteristics of high specific modulus and low density of carbon fiber, improves the bending rigidity of the antenna support under the conditions of not changing the overall dimension of the antenna support and not greatly increasing the quality of the antenna support structure, further improves the bending vibration dominant frequency of the antenna support, solves the problem of fracture of the antenna support of the metro vehicle, and has simple structural design and mature structural process, thereby meeting the design and production requirements of the antenna support.
In order to solve the technical problems, the invention adopts the technical scheme that:
a method for improving rigidity of an antenna support of a metro vehicle is characterized in that a carbon fiber reinforced pipe is installed inside a steel pipe of the antenna support and is tightly attached to the steel pipe, and the method comprises the following specific steps:
step 1, welding a steel pipe of an antenna bracket: welding steel pipes to form a frame of the antenna bracket, and reserving mounting positions of end supports at two ends of the antenna bracket;
step 2, increasing the friction force of the inner wall of the steel pipe: machining the inner wall of the steel pipe welded in the step 1 by using the inner wall of the steel pipe to form a concave-convex surface on the inner wall of the steel pipe, wherein the concave-convex surface increases the friction force of the inner wall of the steel pipe;
step 3, arranging a carbon fiber reinforced pipe in the steel pipe: the carbon fiber reinforced pipe is tightly attached to the inner wall of the steel pipe and is fixed in the steel pipe through the positioning block;
step 4, welding the end support: and (3) welding the end support at the mounting position of the end support reserved in the step (1) to complete the integral assembly of the antenna support.
Preferably, in step 3, the carbon fiber reinforced pipe is continuously and uninterruptedly arranged in the steel pipe, and the thickness of the carbon fiber reinforced pipe is 5 mm.
Preferably, in step 3, the carbon fiber reinforced pipes are symmetrically distributed in the steel pipe in a multi-section mode, the lengths of the carbon fiber reinforced pipes are shortened in sequence from the middle to two ends of the steel pipe, and the carbon fiber reinforced pipes are fixed in position through the positioning blocks.
Preferably, the length of the carbon fiber reinforced pipe in the middle of the steel pipe is 600mm, and the thickness of the carbon fiber reinforced pipe is 6 mm.
By adopting any one of the above methods for improving the rigidity of the antenna support of the metro vehicle, a high-rigidity antenna support structure of the metro vehicle is designed, and the support structure comprises a steel pipe, an end support, a carbon fiber reinforced pipe and a positioning block; the steel pipe welding forms antenna boom, the inner wall of steel pipe is the concave-convex surface, the carbon fiber reinforced pipe closely laminates the inner wall setting at the steel pipe, and the carbon fiber reinforced pipe utilizes the locating piece to fix in the inside of steel pipe, end support fixed connection is at the both ends of steel pipe.
The invention has the following beneficial effects:
1. according to the method for improving the rigidity of the subway vehicle antenna support, disclosed by the invention, the bending rigidity of the antenna support is improved by utilizing the characteristics of high specific modulus and low density of carbon fibers under the conditions that the overall dimension of the antenna support is not changed and the quality of the antenna support structure is not greatly increased, so that the bending vibration dominant frequency of the antenna support is further improved, and the problem of breakage of the subway vehicle antenna support is solved.
2. When the carbon fiber reinforced pipe is arranged in the steel pipe continuously and uninterruptedly, the thickness of the carbon fiber reinforced pipe is 5mm, the bending vibration dominant frequency of the antenna bracket is 94Hz, and the design can meet the design requirement at the moment, and meanwhile, the process is simple, and the economy is good.
3. When the carbon fiber reinforced pipe is multistage formula symmetric distribution in the steel pipe, at the middle part to both ends of steel pipe, the length of carbon fiber reinforced pipe shortens in proper order, because the antenna boom middle part is the biggest region that rigidity changes, also is the region that the crackle appears, consequently the antenna boom middle part is the key position that rigidity intensity was strengthened, consequently, sets up the carbon fiber reinforced pipe of length 600mm, thickness 6mm in the antenna boom middle part, further increases the rigidity in antenna boom middle part.
4. Based on the method for improving the rigidity of the metro vehicle antenna support, the designed high-rigidity metro vehicle antenna support structure is simple and reasonable in structural design, replacement and installation are facilitated under the condition that the size of an interface of an original structure is not changed, bending rigidity is improved, structural performance is optimized, and the metro vehicle antenna support structure is suitable for metro vehicle bogies of various sizes.
Drawings
FIG. 1 is a diagram of a mounting position of an antenna bracket of a subway vehicle;
FIG. 2 is a flow chart of the steps of a method of improving the rigidity of an antenna support of a metro vehicle in accordance with the present invention;
FIG. 3 is a schematic structural view of the carbon fiber reinforced pipe of example 2 arranged in a steel pipe continuously and uninterruptedly;
FIG. 4 is a graph showing a bending mode of a steel pipe with a carbon fiber-reinforced pipe built therein;
FIG. 5 is a graph of wall thickness of a carbon fiber reinforced pipe versus bending modal frequency of the steel pipe;
fig. 6 is a structural schematic view of the carbon fiber reinforced pipe in embodiment 3 in a multi-stage symmetrical distribution in the steel pipe.
Among them are: 1. a metro vehicle bogie frame; 2. an antenna mount; 3. an antenna mount; 4. a steel pipe; 5. a carbon fiber reinforced tube; 51. a carbon fiber reinforced pipe I; 52. a second carbon fiber reinforced tube; 51. a third carbon fiber reinforced pipe; 6. an end support; 7. and (5) positioning the blocks.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific preferred embodiments.
In the description of the present invention, it is to be understood that the terms "left side", "right side", "upper part", "lower part", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and that "first", "second", etc., do not represent an important degree of the component parts, and thus are not to be construed as limiting the present invention. The specific dimensions used in the present example are only for illustrating the technical solution and do not limit the scope of protection of the present invention.
In the real operation of the subway, the subway vehicle antenna support 3 can have the fracture failure problem, the reason for the problem is analyzed and researched that the wheel rail excitation caused by the elastic track has 60Hz main frequency, the wheel rail excitation main frequency is coupled with the bending main frequency of the antenna support 3, the coupling vibration of the structure causes the vibration fatigue fracture of the structure, but the vehicle line condition is determined, the difficulty of rectifying and modifying the existing vehicle line is high, the bending rigidity of the antenna support 3 needs to be improved for avoiding the coupling vibration, so that the bending vibration main frequency (the bending vibration main frequency is improved to more than 80 Hz) of the antenna support 3 is improved, and the separation of the structural vibration main frequency and the wheel rail excitation main frequency is realized.
Example 1
As shown in fig. 1 and fig. 2, in order to solve the problems existing in the actual operation of the subway, a method for improving the rigidity of the antenna support 3 of the subway vehicle is proposed, the method utilizes the characteristics of high specific modulus and low density of carbon fiber, installs a carbon fiber reinforced pipe 5 inside a steel pipe 4 of the antenna support 3, improves the bending rigidity of the antenna support 3 without changing the external dimension of the antenna support 3 and greatly increasing the structural mass of the antenna support 3, and further improves the bending vibration dominant frequency of the antenna support 3, and the method of the embodiment specifically comprises the following steps:
step 1, welding a steel pipe 4 of an antenna bracket 3: welding a steel pipe 4 to form a frame of the antenna bracket 3, and reserving mounting positions of end supports 6 at two ends of the antenna bracket 3;
step 2, increasing the friction force of the inner wall of the steel pipe 4: in the steel pipe 4 welded in the step 1, the inner wall of the steel pipe 4 is machined by using the inner wall of the steel pipe 4, so that the inner wall of the steel pipe 4 forms a concave-convex surface, and the concave-convex surface increases the friction force of the inner wall of the steel pipe 4;
step 3, arranging a carbon fiber reinforced pipe 5 in the steel pipe 4: the carbon fiber reinforced pipe 5 is tightly attached to the inner wall of the steel pipe 4, and the carbon fiber reinforced pipe 5 is fixed in the steel pipe 4 through a positioning block 7;
step 4, welding the end support 6: and (3) welding the end support at the mounting position of the end support 6 reserved in the step (1) to complete the integral assembly of the antenna support 3.
In this embodiment, through set up carbon fiber reinforced pipe 5 inside steel pipe 4, improved antenna support 3's bending stiffness, and then improve antenna support 3's bending vibration dominant frequency for antenna support 3's bending vibration dominant frequency is greater than wheel rail excitation dominant frequency, has solved the condition of the 3 fracture inefficacy of subway vehicle antenna support that arouse because of the wheel rail excitation dominant frequency that the elastic track arouses.
Example 2
As shown in fig. 3, in step 3 of example 1, the carbon fiber reinforced pipes 5 are continuously and uninterruptedly disposed in the steel pipe 4, the carbon fiber reinforced pipes 5 with different thicknesses are disposed in the steel pipe 4, the lengths of the carbon fiber reinforced pipes 5 are all 1540mm, a bending mode vibration type experiment is performed to obtain a bending mode vibration type diagram as shown in fig. 4, and the relation between the wall thickness of the carbon fiber reinforced pipe 5 and the bending mode frequency as shown in fig. 5 is obtained by analyzing the bending mode vibration type experiment;
when the wall thickness of the carbon fiber reinforced pipe 5 is 3mm, the bending frequency of the steel pipe 4 is 70 Hz;
when the wall thickness of the carbon fiber reinforced pipe 5 is 4mm, the bending frequency of the steel pipe 4 is 84 Hz;
when the wall thickness of the carbon fiber reinforced pipe 5 is 5mm, the bending frequency of the steel pipe 4 is 94 Hz;
when the wall thickness of the carbon fiber reinforced pipe 5 is 6mm, the bending frequency of the steel pipe 4 is 101 Hz;
the analysis concludes that: the thicker the carbon fiber reinforced pipe 5 is, the larger the bending frequency of the steel pipe 4 is, and the bending frequency of the steel pipe 4 is required to reach more than 80Hz, so that the wall thickness of the carbon fiber reinforced pipe 5 is required to reach more than 4mm, in the embodiment, the carbon fiber reinforced pipe 5 with the wall thickness of 5mm is preferred, so that the design requirement can be met, and meanwhile, the process is simple and the economy is good.
Example 3
As shown in fig. 6, the difference from embodiment 2 is that in step 3 of embodiment 1, the carbon fiber reinforced pipes 5 are symmetrically distributed in a multi-stage manner in the steel pipe 4, and the lengths of the carbon fiber reinforced pipes 5 are sequentially shortened from the middle to the two ends of the steel pipe 4, and the carbon fiber reinforced pipes 5 are fixed in position by the positioning block 7.
In the bending mode shape diagram of fig. 4, the middle part of the steel tube 4 is a region with the largest change in stiffness, which is also a region with cracks, and the steel tube 4 has lower and lower requirements on the stiffness of the structure from the middle to the two ends, so the middle part of the steel tube 4 is a key reinforcing position of the structure, and the two ends of the steel tube 4 are non-key reinforcing positions.
Preferably, the length of the carbon fiber reinforced pipe 5 arranged in the middle of the steel pipe 4 is 600mm, and the thickness of the carbon fiber reinforced pipe 5 is 6 mm; the rigidity of the middle part of the steel pipe 4 is strengthened, and meanwhile, the production cost is reduced.
In conclusion, the invention designs a high-rigidity subway vehicle antenna support 3 structure, which comprises a steel pipe 4, an end support 6, a carbon fiber reinforced pipe 5 and a positioning block 7; the steel pipe 4 welds and forms antenna boom 3, the inner wall of steel pipe 4 is concave-convex form surface, carbon fiber reinforced tube 5 closely laminates the inner wall setting at steel pipe 4, and carbon fiber reinforced tube 5 utilizes locating piece 7 to fix in the inside of steel pipe 4, end support 6 fixed connection is at the both ends of steel pipe 4.
The high-rigidity subway vehicle antenna support 3 structure improves the bending rigidity of the antenna support 3 and optimizes the structural performance under the conditions that the overall dimension of the antenna support 3 is not changed and the quality of the antenna support 3 structure is not greatly increased, has simple and reasonable structural design, is convenient to replace and install, and is suitable for subway vehicle bogies of various sizes.
Although the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the details of the embodiments, and various equivalent modifications can be made within the technical spirit of the present invention, and the scope of the present invention is also within the scope of the present invention.
Claims (5)
1. A method for improving rigidity of an antenna bracket of a metro vehicle is characterized by comprising the following steps: the carbon fiber reinforced pipe is arranged inside the steel pipe of the antenna bracket and closely attached to the steel pipe, and the method comprises the following specific steps:
step 1, welding a steel pipe of an antenna bracket: welding steel pipes to form a frame of the antenna bracket, and reserving mounting positions of end supports at two ends of the antenna bracket;
step 2, increasing the friction force of the inner wall of the steel pipe: machining the inner wall of the steel pipe welded in the step 1 by using the inner wall of the steel pipe to form a concave-convex surface on the inner wall of the steel pipe, wherein the concave-convex surface increases the friction force of the inner wall of the steel pipe;
step 3, arranging a carbon fiber reinforced pipe in the steel pipe: the carbon fiber reinforced pipe is tightly attached to the inner wall of the steel pipe and is fixed in the steel pipe through the positioning block;
step 4, welding the end support: and (3) welding the end support at the mounting position of the end support reserved in the step (1) to complete the integral assembly of the antenna support.
2. The method for improving the rigidity of the antenna bracket of the metro vehicle according to claim 1, wherein the method comprises the following steps: in step 3, the carbon fiber reinforced pipe is continuously and uninterruptedly arranged in the steel pipe, and the thickness of the carbon fiber reinforced pipe is 5mm at the moment.
3. The method for improving the rigidity of the antenna bracket of the metro vehicle according to claim 1, wherein the method comprises the following steps: in step 3, the carbon fiber reinforced pipes are symmetrically distributed in the steel pipe in a multi-section mode, the length of the carbon fiber reinforced pipes is shortened in sequence from the middle to two ends of the steel pipe, and the carbon fiber reinforced pipes are fixed in position through the positioning blocks.
4. The method for improving the rigidity of the antenna bracket of the metro vehicle according to claim 3, wherein the method comprises the following steps: the length of the carbon fiber reinforced pipe in the middle of the steel pipe is 600mm, and the thickness of the carbon fiber reinforced pipe is 6 mm.
5. The utility model provides a railcar antenna boom structure of high rigidity which characterized in that: the subway vehicle antenna bracket structure is manufactured by adopting the method for improving the rigidity of the subway vehicle antenna bracket according to any one of claims 1 to 4, wherein the high-rigidity subway vehicle antenna bracket structure comprises a steel pipe, an end support, a carbon fiber reinforced pipe and a positioning block;
the steel pipe welding forms antenna boom, the inner wall of steel pipe is the concave-convex surface, the carbon fiber reinforced pipe closely laminates the inner wall setting at the steel pipe, and the carbon fiber reinforced pipe utilizes the locating piece to fix in the inside of steel pipe, end support fixed connection is at the both ends of steel pipe.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010945623.1A CN111883902A (en) | 2020-09-10 | 2020-09-10 | Method and structure for improving rigidity of subway vehicle antenna support |
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| CN202010945623.1A CN111883902A (en) | 2020-09-10 | 2020-09-10 | Method and structure for improving rigidity of subway vehicle antenna support |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1564376A (en) * | 2004-03-30 | 2005-01-12 | 北京科迪安科技有限公司 | Electromagnetic wave receiving antenna |
| US20050176513A1 (en) * | 2004-02-11 | 2005-08-11 | Illinois Tool Works Inc. | Steel automotive drive shaft with carbon fiber liner |
| CN103560330A (en) * | 2013-10-30 | 2014-02-05 | 中国电子科技集团公司第三十九研究所 | Carbon fiber antenna radiation beam and manufacturing method thereof |
| CN110425411A (en) * | 2019-07-31 | 2019-11-08 | 杭州一丞一木家居有限公司 | A kind of plate of bend resistance |
-
2020
- 2020-09-10 CN CN202010945623.1A patent/CN111883902A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050176513A1 (en) * | 2004-02-11 | 2005-08-11 | Illinois Tool Works Inc. | Steel automotive drive shaft with carbon fiber liner |
| CN1564376A (en) * | 2004-03-30 | 2005-01-12 | 北京科迪安科技有限公司 | Electromagnetic wave receiving antenna |
| CN103560330A (en) * | 2013-10-30 | 2014-02-05 | 中国电子科技集团公司第三十九研究所 | Carbon fiber antenna radiation beam and manufacturing method thereof |
| CN110425411A (en) * | 2019-07-31 | 2019-11-08 | 杭州一丞一木家居有限公司 | A kind of plate of bend resistance |
Non-Patent Citations (1)
| Title |
|---|
| 胡定祥等: "轮对提吊异常振动分析及改进", 《铁道机车车辆》 * |
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Application publication date: 20201103 |
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