CN108058794B - Port tug bow fender and bracket structure - Google Patents
Port tug bow fender and bracket structure Download PDFInfo
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- CN108058794B CN108058794B CN201810050859.1A CN201810050859A CN108058794B CN 108058794 B CN108058794 B CN 108058794B CN 201810050859 A CN201810050859 A CN 201810050859A CN 108058794 B CN108058794 B CN 108058794B
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- bracket
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- panel
- arc plate
- arc
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 19
- 239000010959 steel Substances 0.000 claims abstract description 19
- 239000012779 reinforcing material Substances 0.000 claims abstract description 11
- 230000007704 transition Effects 0.000 claims abstract description 9
- 238000005192 partition Methods 0.000 claims description 27
- 238000000034 method Methods 0.000 abstract description 6
- 230000008569 process Effects 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000012423 maintenance Methods 0.000 abstract description 3
- 238000009435 building construction Methods 0.000 abstract description 2
- 238000004364 calculation method Methods 0.000 description 12
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 210000000988 bone and bone Anatomy 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 101100272667 Xenopus laevis ripply2.2 gene Proteins 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B59/00—Hull protection specially adapted for vessels; Cleaning devices specially adapted for vessels
- B63B59/02—Fenders integral with waterborne vessels or specially adapted therefor, e.g. fenders forming part of the hull or incorporated in the hull; Rubbing-strakes
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Bridges Or Land Bridges (AREA)
- Body Structure For Vehicles (AREA)
Abstract
The invention discloses a port-acting tug bow fender and bracket structure, which comprises a bracket arc plate for supporting a rubber fender, wherein the upper end of the bracket arc plate is connected with a bracket upper panel through transition round steel, the lower end of the bracket arc plate is connected with a bracket lower panel through transition round steel, and the other sides of the bracket upper panel and the bracket lower panel are main hulls; the bracket comprises a bracket upper panel, a bracket lower panel, a baffle plate, an arc plate supporting plate, a bracket arc plate supporting plate and a reinforcing material, wherein the baffle plate is connected between the bracket upper panel and the bracket lower panel, the arc plate supporting plate is connected with the bracket arc plate, the bracket arc plate is a straight line tangent to the arc at an included angle of 25-30 degrees with the horizontal angle, and the reinforcing material is arranged at the bracket arc plate; the baffle plate is provided with lightening holes. The invention reduces the maintenance cost of the ship; the ship building construction process is improved, the production efficiency is improved, and the ship building cost is reduced.
Description
Technical Field
The invention relates to a port tug bow fender and bracket structure.
Background
The port towing operation is used as a tie for connecting ship transportation and port production, and plays a very important role. Most large ships entering and exiting ports are moored, off-moored and transferred with the assistance of tugs. Therefore, the tug has important significance for ensuring the sailing safety of the ship at the port, the turnover speed of the ship, the operation efficiency of the port, maintaining the sailing order and protecting the water area environment of the port. The full-rotation tug for the port of the domestic port is mainly in a pushing operation mode when the tug is supported by the large wheel, and the tug pushing operation is relatively stable when no surge exists on the sea surface. However, when the vehicle works in severe weather, the tug wheel and the supporting large wheel can move up and down relatively. The frequency amplitude of the float is related to the surge, and when the surge is large, the float amplitude of the tug is large. The relative movement during pushing operation can lead the bracket to be unwelded due to extrusion, thereby directly affecting the service life of the tug operation and the rubber backing bar. Therefore, it is necessary to calculate the stress state of the tug bracket when there is a surge, and analyze the cause of the bracket damage. To reduce maintenance costs of the vessel; improving the ship construction process, improving the production efficiency and reducing the shipbuilding cost.
The profile of the existing carrier bow and the distribution of the partitions are shown in figure 1. The cross section of the bracket is shown in fig. 2, and the bracket consists of a baffle plate 1, a plate thickness of 8mm, a lightening hole panel 2, flat steel with the specification of 10X100, a bracket upper panel 3, a plate thickness of 12mm, a reinforcing material 4, a plate thickness of 12mm, a transition round steel 5, a plate thickness of 10mm and other structures, and the transverse supporting plate and the circular arc supporting plate cannot be welded due to the limitation of the manufacturing process.
Disclosure of Invention
The invention aims to provide a port tug bow fender and bracket structure, which are used for solving the problems of the existing bracket bow line type and bracket structure.
And analyzing the damage reason of the bracket by calculating the stress state of the bracket of the tug when the surge exists. The calculation is based on finite element calculation software Femap & NX Nastran to establish a bracket calculation model, the bracket adopts units such as Plate, bar and the like to simulate, the stress of the bracket structure is calculated and analyzed, the bracket structure is optimized according to the calculation result, and the feasibility of an optimization scheme is verified.
1. Establishing a tug bow geometric model as shown in fig. 3;
Because the ship body is bilaterally symmetrical, a model of the starboard side of the tug is built for improving the calculation efficiency. The bracket finite element model uses Plate, bar, rigid and Gap types of units.
(1) Plate unit
The volume size of the ship body such as steel plates of decks, transverse bulkheads, transverse strong frames and the like is far larger than the thickness dimension, and the ship body can be simplified into a thin Plate structure by adopting a Plate unit;
(2) Bar unit
The length dimensions of the longitudinal bones, the trusses and the stiffening materials are far larger than the section dimensions, so that the longitudinal bones, the trusses and the stiffening materials can be simplified into a rod-beam structure, and Bar units are adopted.
(3) Rigid units
And a rigid body unit for simulating the process of transmitting the collision force to the rubber fender.
(4) Gap unit
Considering the deformation and energy absorption effects of the rubber fender when the rubber fender is extruded, a Gap unit is added between each baffle plate and Rigid units to simulate the deformation process of the rubber fender.
According to the specifications of the rubber fender in the chemical industry standard of the people's republic of China:
When the deformation amount of the 800X1000 rubber fender reaches 50%, the reaction force is 237.4KN.
Deformation amount: delta = 50% d = 400mm;
Reaction force: f=237.4kn= 237400N
Gap unit number at each separator: n=15
Compression stiffness of each Gap cell: therefore, the compression stiffness of the Gap unit in the model takes 39N/mm.
2. Constraint
Applying symmetrical plane constraint on the middle longitudinal section of the ship body; applying a fixed constraint on the cross section of the tail end of the model; a fixed constraint in the longitudinal direction of the carriage is imposed at the index node of each Rigid unit.
3. Load of
The maximum thrust of the "2942kW" tug is 52 tons. The maximum jacking force is not used when the pushing operation is normally carried out, and the load is selected to be 52t maximum jacking force for safety. The rubber backrest 10 of the tug has a vertical sliding trend with the outer plate of the tug, the steel and the rubber have static friction, and the friction coefficient mu of the rubber backrest is 0.6 in consideration of the lubrication action of water.
The normal force FN in the direction of the diaphragm is equal to the maximum thrust, i.e
FN＝509.6kN
Vertical component fz=μfn= 305.76kN
4. Calculation results and analysis
The partition board and the circular arc supporting board are the main force transmission structure of the bracket. In actual operation, the tug is placed vertically or nearly vertically with the large ship, the bracket structure near the longitudinal section in the tug mainly bears the load action, and the partition plate and the circular arc supporting plate at the corresponding positions are damaged and deformed. Therefore, the strength of the arc supporting plate between the partition plates between P0 and P3 and between two adjacent partition plates is checked.
5. Baffle strength check
Divide into 2 operating modes and check the baffle: working condition 1-load is borne by only one bulkhead; working condition 2-load is borne by the partition plate and the two adjacent rows of arc supporting plate units.
(1) Working condition 1 intensity check
Considering the deformation and energy absorption effects of the rubber fender when the rubber fender is extruded, a Gap unit is added between each baffle plate and Rigid units to simulate the deformation process of the rubber fender, and the compression rigidity of the Gap unit is 39N/mm. The same number 3 load is applied to each partition response position Rigid unit Independent node. For the convenience of observation, the upper panel of the bracket is hidden and displayed, and the calculation results are shown in the following table.
It is thus seen that the maximum stress is concentrated at the location where the top end of the diaphragm is connected to the upper panel of the bracket and exceeds the yield strength of the material. This situation corresponds to the actual damage situation of the carrier.
(2) Working condition 2 intensity check
When the partition plate and a row of left and right adjacent circular arc supporting plate units bear acting force at the same time, namely, 1/3 of the load with the same number 3 is respectively applied to three Rigid units of Inependent nodes of the partition plate and the left and right adjacent circular arc supporting plates. The calculation results are shown in the following table.
From the calculation result, the maximum stress of the separator under the working condition 2 is within the yield strength, namely, the separator is not damaged. When only one baffle plate bears the load under the working condition 1, the structure of the baffle plate can be damaged; when the adjacent R plates (arc supporting plates) and the partition plates bear load under the working condition 2, the structure of the partition plates cannot be damaged. Therefore, it is necessary to modify the tug bow bracket line shape to avoid the relative sharp angle, so that the contact between the rubber fender and the pushed large wheel is more uniform, and the collision force is more uniformly dispersed on the bracket through the rubber fender, so as to avoid the concentration of the acting force on one partition plate.
6. R plate strength check
The R plate is checked under two working conditions:
namely, the working condition 3-a row of units in the middle of an R plate between two adjacent partition plates bear load;
working condition 4-load is borne by two adjacent columns of units in the middle of the R plate between two adjacent partition plates.
Working condition 3 intensity check
The load with the same number 3 is applied to a row of units, namely two rows of nodes, in the middle of the arc supporting plate between two adjacent partition plates, and the calculation results are shown in the following table.
| Load position | P00-P01 | P01-P02 | P02-P03 | P03-P04 |
| Equivalent stress (MPa) | 310.0 | 295.0 | 292.9 | 320.2 |
The calculation result shows that the maximum stress position in the working condition 3 is positioned at the middle upper part of the R plate and is consistent with the actual damage condition, and the maximum Von-Mises stress on the R plate exceeds the yield strength.
Working condition 4 intensity check
The load with the same number 3 is applied to two rows of units in the middle of the arc supporting plate between two adjacent partition plates, namely, two rows of nodes, and the calculation results are shown in the following table.
The calculation result shows that the maximum stress of the circular arc supporting plate under the working condition 4 is within the yield strength, namely the circular arc supporting plate cannot be damaged.
7. Conclusion of original protocol for bracket
When a load is applied to only one of the separators, the separator structure is broken. Therefore, it is necessary to optimize the tug bow cradle line shape to avoid relatively sharp corners, making contact between the rubber fender and the pushed large wheel more uniform, thereby distributing the collision force more uniformly to the cradle through the rubber fender.
The maximum stress of the partition board is located at the position where the top end of the partition board is connected with the upper panel of the bracket, and the impact force is transmitted along the horizontal upward direction due to the friction force between the rubber fender and the pushed large wheel. Therefore, it is necessary to optimize the shape of the separator and alleviate the stress concentration at the upper end of the separator.
And under the working condition 3, the stress on the R plate reaches the yield strength, and the structure and the plate of the R plate are required to be optimized.
Through the above experiments, the invention proposes the following technical scheme to achieve the purpose of the invention:
The invention relates to a port-acting tug bow fender and bracket structure, which comprises a bracket arc plate for supporting a rubber fender, wherein the upper end of the bracket arc plate is connected with a bracket upper panel through transition round steel, the lower end of the bracket arc plate is connected with a bracket lower panel through transition round steel, and the other sides of the bracket upper panel and the bracket lower panel are main hulls; the bracket comprises a bracket upper panel, a bracket lower panel, a baffle plate, a circular arc plate supporting plate, a bracket arc plate supporting plate and a reinforcing material, wherein the baffle plate is connected between the bracket upper panel and the bracket lower panel, the circular arc plate supporting plate is connected with the bracket arc plate, the bracket arc plate is a straight line tangent to the circular arc at an included angle of 25-30 degrees with the horizontal angle, and the reinforcing material is arranged at the bracket arc plate; the baffle is provided with lightening holes.
Wherein, the wall of the lightening hole is provided with a lightening hole panel.
The shape of the lightening hole is a waist round hole, and the waist round length and the diameter of the round hole are determined by the size of the partition plate.
Wherein the lightening hole panel is made of flat steel, and the thickness of the lightening hole panel is 1-2 mm greater than that of the partition plate.
Wherein, the reinforcing material between the cross bracing plate and the upper panel is angle steel.
Wherein the thickness of the partition board is 10 mm-12 mm.
Wherein the thickness of the arc supporting plate is 12 mm-14 mm.
Due to the adoption of the technical scheme, the port tug bow fender and bracket structure reduces the maintenance cost of the ship; the ship building construction process is improved, the production efficiency is improved, and the ship building cost is reduced.
Drawings
FIG. 1 illustrates a prior art bracket bow pattern and spacer distribution;
FIG. 2 is a cross-sectional view of a prior art bracket;
FIG. 3 tug bow geometry model;
FIG. 4 is a fore-aft comparison of fore-aft profile optimization;
Figure 5 is a cross-sectional view of a bracket of the present invention.
Wherein: 1, a partition board; 2, lightening the hole panel; 3, a bracket upper panel; 4, reinforcing materials; 5, transitional round steel; 6, an arc plate supporting plate; 7, a bracket lower panel; 8, a bracket arc plate; 9, a main hull; 10, rubber rest; 11, optimizing the line type; 12, original line type.
Detailed Description
The invention is further described below with reference to the drawings and the detailed description:
As shown in fig. 4 and 5, the port tug bow fender and bracket structure of the invention comprises a bracket arc plate 8 for supporting a rubber fender, wherein the upper end of the bracket arc plate 8 is connected with a bracket upper panel 3 through a transition round steel 5, the lower end of the bracket arc plate 8 is connected with a bracket lower panel 7 through the transition round steel 5, and the other sides of the bracket upper and lower panels are main ship bodies 9; the bracket comprises a bracket upper panel 3, a bracket lower panel 7, a partition plate 1, a bracket arc plate support plate 6, a bracket arc plate 8, a reinforcing material 4 and a bracket arc plate 8, wherein the partition plate 1 is connected between the bracket upper panel 3 and the bracket lower panel 7; the baffle 1 is provided with a lightening hole, the shape of the lightening hole is a waist round hole, the waist round length and the diameter of the round hole are determined by the size of the baffle, the wall of the lightening hole is provided with a lightening hole panel, the lightening hole panel is flat steel, and the thickness of the lightening hole panel is 1-2 mm greater than the thickness of the baffle.
Wherein the reinforcing material 4 is angle steel.
Wherein, the thickness of the baffle is 10 mm-12 mm.
Wherein the thickness of the bracket arc plate 8 is 12 mm-14 mm.
The foregoing detailed description is exemplary only and is not intended to limit the scope of the patent so that others skilled in the art may better understand the patent; any equivalent alterations or modifications made in accordance with the spirit of the disclosure fall within the scope of the disclosure.
Claims (5)
1. A port tug bow fender and bracket structure comprises a bracket arc plate for supporting a rubber fender, wherein the upper end of the bracket arc plate is connected with an upper bracket panel through transition round steel, the lower end of the bracket arc plate is connected with a lower bracket panel through transition round steel, and the other sides of the upper bracket panel and the lower bracket panel are main hulls; still including connecting baffle, the baffle that is connected with the circular arc board of bracket on the baffle between bracket top panel and the bracket bottom plate are backup pad, its characterized in that: the arc plate of the bracket is a straight line tangent to the arc at an included angle of 25-30 degrees with the horizontal angle, the straight line faces upwards, and reinforcing materials are arranged at the straight line; the partition plate is provided with a lightening hole;
a lightening hole panel is arranged on the wall of the lightening hole;
the shape of the lightening hole is a waist round hole.
2. The port tug bow fender and bracket structure of claim 1, wherein: the lightening hole panel is made of flat steel, and the thickness of the lightening hole panel is greater than that of the partition plate by 1-2 mm.
3. The port tug bow fender and bracket structure of claim 1, wherein: the reinforcing material is angle steel.
4. The port tug bow fender and bracket structure of claim 1, wherein: the thickness of the partition board is 10 mm-12 mm.
5. The port tug bow fender and bracket structure of claim 1, wherein: the thickness of the bracket arc plate is 12 mm-14 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810050859.1A CN108058794B (en) | 2018-01-18 | 2018-01-18 | Port tug bow fender and bracket structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810050859.1A CN108058794B (en) | 2018-01-18 | 2018-01-18 | Port tug bow fender and bracket structure |
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| Publication Number | Publication Date |
|---|---|
| CN108058794A CN108058794A (en) | 2018-05-22 |
| CN108058794B true CN108058794B (en) | 2024-06-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810050859.1A Active CN108058794B (en) | 2018-01-18 | 2018-01-18 | Port tug bow fender and bracket structure |
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| CN (1) | CN108058794B (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2060202C1 (en) * | 1992-09-03 | 1996-05-20 | Товарищество с ограниченной ответственностью - предприятие "Ком-Кон" | Rubber |
| JPH11286921A (en) * | 1998-04-03 | 1999-10-19 | Penta Ocean Constr Co Ltd | Mooring device for large-sized floating body |
| US6289836B1 (en) * | 2000-03-13 | 2001-09-18 | Michael Tellex | Marine fender |
| JP2011245945A (en) * | 2010-05-25 | 2011-12-08 | Nishi-F Co Ltd | Fender, and ship provided with the same |
| CN202593828U (en) * | 2012-03-30 | 2012-12-12 | 宋学刚 | Connecting structure of tubular fender |
| CN203581346U (en) * | 2013-11-18 | 2014-05-07 | 江苏省镇江船厂（集团）有限公司 | Binding structure of full-rotary tugboat rubber fender |
| CN105129047A (en) * | 2015-09-07 | 2015-12-09 | 中船黄埔文冲船舶有限公司 | Fixing device and fixing method of O-shaped outboard rubber fender for ship |
| CN205293018U (en) * | 2015-12-28 | 2016-06-08 | 江苏省镇江船厂（集团）有限公司 | Rubber fender frame of towboat bow turns around entirely |
| CN205293019U (en) * | 2015-12-28 | 2016-06-08 | 江苏省镇江船厂（集团）有限公司 | Rubber fender ligature area protection device |
| CN205293017U (en) * | 2015-12-28 | 2016-06-08 | 江苏省镇江船厂（集团）有限公司 | Circular rubber fender center chain both ends protection device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150144047A1 (en) * | 2013-11-25 | 2015-05-28 | Adam Ayash | Fender holder and assembly |
-
2018
- 2018-01-18 CN CN201810050859.1A patent/CN108058794B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2060202C1 (en) * | 1992-09-03 | 1996-05-20 | Товарищество с ограниченной ответственностью - предприятие "Ком-Кон" | Rubber |
| JPH11286921A (en) * | 1998-04-03 | 1999-10-19 | Penta Ocean Constr Co Ltd | Mooring device for large-sized floating body |
| US6289836B1 (en) * | 2000-03-13 | 2001-09-18 | Michael Tellex | Marine fender |
| JP2011245945A (en) * | 2010-05-25 | 2011-12-08 | Nishi-F Co Ltd | Fender, and ship provided with the same |
| CN202593828U (en) * | 2012-03-30 | 2012-12-12 | 宋学刚 | Connecting structure of tubular fender |
| CN203581346U (en) * | 2013-11-18 | 2014-05-07 | 江苏省镇江船厂（集团）有限公司 | Binding structure of full-rotary tugboat rubber fender |
| CN105129047A (en) * | 2015-09-07 | 2015-12-09 | 中船黄埔文冲船舶有限公司 | Fixing device and fixing method of O-shaped outboard rubber fender for ship |
| CN205293018U (en) * | 2015-12-28 | 2016-06-08 | 江苏省镇江船厂（集团）有限公司 | Rubber fender frame of towboat bow turns around entirely |
| CN205293019U (en) * | 2015-12-28 | 2016-06-08 | 江苏省镇江船厂（集团）有限公司 | Rubber fender ligature area protection device |
| CN205293017U (en) * | 2015-12-28 | 2016-06-08 | 江苏省镇江船厂（集团）有限公司 | Circular rubber fender center chain both ends protection device |
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| CN108058794A (en) | 2018-05-22 |
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