AU2021103947A4 - A falling body slamming test device and method for hull structure based on impacting acceleration - Google Patents
A falling body slamming test device and method for hull structure based on impacting acceleration Download PDFInfo
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- AU2021103947A4 AU2021103947A4 AU2021103947A AU2021103947A AU2021103947A4 AU 2021103947 A4 AU2021103947 A4 AU 2021103947A4 AU 2021103947 A AU2021103947 A AU 2021103947A AU 2021103947 A AU2021103947 A AU 2021103947A AU 2021103947 A4 AU2021103947 A4 AU 2021103947A4
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- bracket
- hull
- heavy object
- frame
- falling body
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- 230000001133 acceleration Effects 0.000 title claims abstract description 24
- 230000003116 impacting effect Effects 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 40
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 238000010998 test method Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/08—Shock-testing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B71/00—Designing vessels; Predicting their performance
- B63B71/20—Designing vessels; Predicting their performance using towing tanks or model basins for designing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M10/00—Hydrodynamic testing; Arrangements in or on ship-testing tanks or water tunnels
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T70/00—Maritime or waterways transport
- Y02T70/10—Measures concerning design or construction of watercraft hulls
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)
Abstract
The present invention discloses a falling body slamming test device for a hull structure based on
impacting acceleration, comprising a frame, a bracket, and a heavy object. The said bracket and
the heavy object are movably connected to the said frame. The said heavy object is arranged
above the said bracket, a pool is arranged below the said frame, and a hull is arranged below the
said bracket. Test method: Lift the heavy object to a certain height, immerse the bottom of the
hull beneath the water surface of the pool; adjust the inclination angle between the hull and the
water surface; release the heavy object; release the bracket when the heavy object reaches the set
position; the heavy object hits the bracket, making the hull enter the water at the target speed and
impact. The present invention discloses a falling body slamming test device and method for a
hull structure based on impacting acceleration. Compared with the existing falling body test
device, the device utilizes a high-speed falling heavy object to hit the hull test model with the
bottom immersed in the water surface, thereby enabling the hull test model to obtain a large
acceleration, reaching the target impact speed, so as to successfully complete the test.
Description
[0001] Technical Field
[0002] The present invention relates to the hull slamming test field, in particular to a falling body slamming test device and method for the hull structure based on impacting acceleration.
[0003] Description of Related Art
[0004] The falling body test technology is one of the main test measures in the research on ship slamming load. Compared with the slamming load test using a three-dimensional ship model in waves, the falling body test model is simpler, and it is easier to observe the physical details of the mutual impact effect between the local hull and the water body during the test. In the falling body slamming test, the impact velocity of the falling body model and the water body is required to approximately simulate the impact velocity between the local structure of the hull and the waves.
[0005] The existing falling body slamming load test technology generally uses the falling body motion of the model to obtain the water entry impact velocity of the model. In order to achieve a certain water entry velocity, the model usually has to be raised to a certain height above the water surface. In the actual ship slamming phenomenon, there are two situations where water comes out from the bottom of the hull and no water comes out. The flow field characteristics of the two situations may be significantly different. Moreover, when the ship sails in waves, even if the bottom of the slammed bow and stern has no water coming out, due to the influence of the overall movement of the ship, the local structure of the bow and stem will impact the water body at a relatively high impact velocity.
[0006] With the existing falling body test technology, when water does not come out of the bottom from the main body of the test model, due to the limitation of the model falling height, it is difficult to obtain a sufficiently high impact velocity by using the falling body motion, and the test cannot be completed.
[0007] The invention provides a falling body slamming test device and method for the hull structure based on impacting acceleration to overcome the above technical problems.
[0008] A falling body slamming test device for the hull structure based on impacting acceleration, comprising: a frame, a bracket and a heavy object, the said bracket and the heavy object are movably connected to the frame, the said heavy object is set above the said bracket, a pool is arranged below the said frame, and a hull is arranged below the bracket.
[0009] Further, the said frame comprises a top frame and a side frame, the said heavy object is connected to the said top frame through a detacher, and the said bracket is connected to the side frame through an electromagnet.
[0010] Further, the said top frame is provided with a motor, the said heavy object is connected to the said motor through a steel wire rope.
[0011] Further, the bottom of the hull enters beneath the water surface of the pool, a photoelectric sensor is provided on the side frame, and the said photoelectric sensor detects the object moving to the upper surface of the bracket.
[0012] Further, the said frame comprises a vertically arranged guide rail, and the said bracket and the heavy object move along the guide rail.
[0013] Further, the said bracket comprises a first bracket, a second bracket, and at least two adjusting rods. The said first bracket is connected to the side frame of the said frame through an electromagnet. The said hull is fixed below the said second bracket, the said adjusting rod is arranged between the said first bracket and the said second bracket, and the length of the said adjusting rod between the said first bracket and the said second bracket can be adjusted.
[0014] Further, the said adjusting rod is a stud with threads at both ends, and the directions of the threads at the two ends of the said stud are different.
[0015] A falling body slamming test device for the hull structure based on impacting acceleration, comprising the following steps:
[0016] Si. Lift the heavy object to a certain height, and immerse the bottom of the hull beneath the water surface of the pool;
[0017] S2. Adjust the inclination angle between the hull and the water surface;
[0018] S3. Release the heavy object;
[0019] S4. When the heavy object reaches the set position, release the bracket;
[0020] S5. The heavy object hits the bracket, enabling the hull to enter the water and impact at the target speed.
[0021] The present invention discloses a falling body slamming test device and method for a hull structure based on impacting acceleration. Compared with the existing falling body test device, the device utilizes a high-speed falling heavy object to hit the hull test model with the bottom immersed in the water surface, thereby enabling the hull test model to obtain a large acceleration, reaching the target impact speed, so as to successfully complete the test.
[0022] In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the accompanying drawings required in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention, and a person of ordinary skill in the art can still derive other drawings according to these accompanying drawings without creative efforts.
[0023] Fig. 1 is the structure diagram of the falling body slamming test device for the hull structure based on impacting acceleration disclosed in the invention of the present invention;
[0024] Fig. 2 is the structure diagram for the bracket disclosed in the invention of the present invention;
[0025] Fig. 3 is the structure diagram of the falling body slamming test device for the hull structure based on impacting acceleration disclosed in the invention of the present invention, and it shows the state that the heavy object just impacts the bracket;
[0026] Fig. 4 is the structure diagram of the falling body slamming test device for the hull structure based on impacting acceleration disclosed in the invention of the present invention, and it shows the state before the bracket and the heavy object fall simultaneously;
[0027] Description of Numbers in Drawings 1. Frame; 101. Top frame; 102. Side frame; 2. Bracket; 201. First bracket; 202. Second bracket; 203. Adjusting rod; 3. Heavy object; 4. Pool; 5. Hull; 6. Detacher; 7. Electromagnet; 8. Motor; 9. Photoelectric sensor; 10. Guide rail.
[0028] To make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments. Obviously, the embodiments described are partial embodiments of the invention and not all embodiments. On the basis of the embodiments in the invention, all other embodiments obtained by a person skilled in the field without making creative labor are covered by the protection of the invention.
[0029] As shown in Fig. 1, a falling body slamming test device for the hull structure based on impacting acceleration, comprising: the frame 1, the bracket 2 and the heavy object 3, the said bracket 2 and the heavy object 3 are movably connected to the said frame 1, the said heavy object 3 is set above the said bracket 2, the pool 4 is arranged below the said frame 1, and the hull 5 is arranged below the bracket 2.
[0030] The hull 5 is fixed below the bracket 2 and is connected to the frame 1 through the bracket 2. Through the difference of the connecting position between the bracket 2 and the frame, the test can be carried out in the conditions of water coming out and not coming out of the bottom of the hull. When carrying out the test with water coming out of the bottom of the hull, fix the bracket and the hull at a higher height, and then make the bracket fall, or make the heavy object and the bracket fall at the same time, then the test can be carried out with water coming out of the bottom of the hull; and when carrying out the test with water not coming out of the bottom of the hull, fix the bracket and the hull at a lower height, and make the bottom of the hull enter beneath the water surface, and then make the heavy object 3 fall, enabling the heavy object 3 to hit the bracket, so that the hull obtains a greater acceleration to contact with water at a higher speed. This device uses a high-speed falling heavy object to hit the hull test model with the bottom immersed in the water, enabling the hull test model to obtain a greater acceleration and reach the target impact speed, so as to successfully complete the slamming test for the hull with water not coming out of the bottom.
[0031] In the invention, the said frame 1 comprises a top frame 101 and a side frame 102, the said heavy object 3 is connected to the said top frame 101 through the detacher 6, and the said bracket 2 is connected to the side frame 102 through the electromagnet 7.
[0032] The said top frame 101 is provided with a motor 8, the said heavy object 3 is connected to the said motor 8 through a steel wire rope.
[0033] The motor 8 pulls up the heavy object 3 through a wire rope, facilitating multiple executions of the test. The heavy object 3 is connected to the top frame 101 through the detacher, facilitating the release of the heavy object 3. The bracket 2 is connected to the side frame 102 through the electromagnet 7, facilitating the control on the release of the bracket 2.
[0034] In order to accurately control the release time point of the bracket 2, the side frame 102 is provided with a photoelectric sensor 9, and the said photoelectric sensor 9 detects the object moving to the upper surface of the said bracket 2. When the heavy object 3 falls above the bracket 2, at the moment the bracket 2 hits, the photoelectric sensor 9 sends out a signal, which is transmitted to the control unit, and the control unit sends out a signal to power off the electromagnet and release the bracket 2.
[0035] In order to ensure the movement trajectory of the bracket and the heavy object, the said frame 1 in the invention comprises a vertically arranged guide rail 10, and the said bracket 2 and the heavy object 3 move along the said guide rail 10. The bracket 2 is provided with a sliding block, which can move along the guide rail. The heavy object 3 is fixed on the connecting frame, which is provided with a sliding block to be connected with the guide rail.
[0036] During the slamming process of the ship, an inclination angle may exist between the local structure of the ship and the free surface of the water body. In order to further realize the slamming test when the inclination angle exists, the posture of the hull model is adjusted through the bracket 2 in the invention. As shown in Fig. 2, the said frame 2 comprises afirst bracket 201, a second bracket 202, and at least two adjusting rods 203. The said first bracket 201 is connected to the side frame 102 of the said frame 1 through the electromagnet 7, the said hull 5 is fixed under the said second bracket 202, the said adjusting rod 203 is arranged between the said first bracket 201 and the second bracket 202. The length of the said adjusting rod 203 between the said bracket 201 and the second bracket 202 can be adjusted. In this invention, the said adjusting rod 203 is a stud with threads at both ends, and the directions of the threads at both ends of the stud are different. The first bracket and the second bracket are provided with internal threads opposite to the stud. By rotating the stud, the angle between the first bracket and the second bracket is adjusted, and the posture of the hull is further adjusted.
[0037] The present invention discloses a falling body slamming test method for the hull structure based on impacting acceleration, comprising the following steps:
[0038] Si. Lift the heavy object to a certain height, and immerse the bottom of the hull beneath the water surface of the pool;
[0039] S2. Adjust the inclination angle between the hull and the water surface;
[0040] S3. Release the heavy object;
[0041] S4. When the heavy object reaches the set position, release the bracket;
[0042] S5. The heavy object hits the bracket, enabling the hull to enter the water and impact at the target speed.
[0043] Start the motor, lift the heavy object through the steel wire rope, then hang the heavy object on the detacher, connect the bracket to the side frame through the electromagnet, and make the bottom of the hull enter beneath the water surface and maintain a proper height.
[0044] Adjust the stud to make the hull model have a proper water entry posture.
[0045] Open the detacher, and release the heavy object.
[0046] When the heavy object falls to the upper surface of the bracket, the photoelectric sensor sends out a signal to power off the electromagnet and release the bracket.
[0047] The heavy object hits the bracket, making the bracket and the hull obtain a larger instantaneous acceleration. The hull enters the water at the target speed and impacts, which realize the slamming load test in the scenario with water not coming out of the bottom of the hull.
[0048] The test device disclosed in the present invention can also be used for carrying out the slamming test for the hull with water coming out of the bottom. The slamming test can be completed only by fixing the bracket on a higher height to separately release the bracket or simultaneously release the heavy object and the bracket which are fixed and connected in accordance with the test requirements.
[0049] It should be understood that although the present description is described in terms of the implementation, not every implementation includes only one separate technical solution, and such a description mode of the description is merely for the sake of clarity. A person skilled in the art should take the description as a whole, and the technical solutions in all the embodiments may be appropriately combined to form other implementations that can be understood by a person skilled in the art. Such modifications or substitutions do not detract the nature of the corresponding technical solutions from the scope of the technical solutions in the embodiments of the present invention.
Claims (5)
1. A falling body slamming test device for the hull structure based on impacting acceleration, comprising: a frame, a bracket and a heavy object, the said bracket and the heavy object are movably connected to the frame, the said heavy object is set above the said bracket, a pool is arranged below the said frame, and a hull is arranged below the bracket.
2. The falling body slamming test device for the hull structure based on impacting acceleration according to claim 1, the said frame comprises a top frame and a side frame, the said heavy object is connected to the said top frame through a detacher, and the said bracket is connected to the side frame through an electromagnet.
3. The falling body slamming test device for the hull structure based on impacting acceleration according to claim 2, the said top frame is provided with a motor, the said heavy object is connected to the said motor through a steel wire rope.
4. The falling body slamming test device for the hull structure based on impacting acceleration according to claim 2, the bottom of the hull enters beneath the water surface of the pool, a photoelectric sensor is provided on the side frame, and the said photoelectric sensor detects the object moving to the upper surface of the bracket.
5. A falling body slamming test device for the hull structure based on impacting acceleration, comprising the following steps: Si. Lift the heavy object to a certain height, and immerse the bottom of the hull beneath the water surface of the pool; S2. Adjust the inclination angle between the hull and the water surface; S3. Release the heavy object; S4. When the heavy object reaches the set position, release the bracket; S5. The heavy object hits the bracket, enabling the hull to enter the water and impact at the target speed.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2021106806543 | 2021-06-18 | ||
| CN202110680654.3A CN113405757B (en) | 2021-06-18 | 2021-06-18 | Ship structure falling body slamming test device and method based on impact acceleration |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AU2021103947A4 true AU2021103947A4 (en) | 2021-10-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| AU2021103947A Ceased AU2021103947A4 (en) | 2021-06-18 | 2021-07-07 | A falling body slamming test device and method for hull structure based on impacting acceleration |
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| Country | Link |
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| CN (1) | CN113405757B (en) |
| AU (1) | AU2021103947A4 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2902025B2 (en) * | 2021-11-17 | 2023-01-05 | Univ Madrid Politecnica | Fluid cyclic impact device for materials testing |
| CN116331431A (en) * | 2023-03-23 | 2023-06-27 | 武汉理工大学 | Device and method for three-dimensional ship bow oblique water-entering slamming experiment |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101767216B1 (en) * | 2016-04-06 | 2017-08-10 | 한국해양과학기술원 | Slamming load measuring device for model tests |
| CN106248343B (en) * | 2016-07-07 | 2019-08-06 | 哈尔滨工程大学 | A kind of two dimensional motion slamming experimental rig |
| CN106556504B (en) * | 2016-11-21 | 2019-01-25 | 武汉理工大学 | A kind of falling bodies slamming experimental rig |
| CN207163687U (en) * | 2017-09-07 | 2018-03-30 | 西安东仪综合技术实验室有限责任公司 | A kind of increase impact energy device for drop type shock table |
| CN107607292B (en) * | 2017-09-11 | 2019-08-06 | 哈尔滨工程大学 | A kind of high speed joining WTO effect experimental rig |
| CN108760537A (en) * | 2018-05-27 | 2018-11-06 | 山西大学 | A kind of large size drop impact device |
| CN111024425A (en) * | 2019-12-10 | 2020-04-17 | 中国特种飞行器研究所 | Vertical water inlet test device and test method for model |
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- 2021-06-18 CN CN202110680654.3A patent/CN113405757B/en active Active
- 2021-07-07 AU AU2021103947A patent/AU2021103947A4/en not_active Ceased
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| Publication number | Publication date |
|---|---|
| CN113405757A (en) | 2021-09-17 |
| CN113405757B (en) | 2022-05-31 |
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| FGI | Letters patent sealed or granted (innovation patent) | ||
| MK22 | Patent ceased section 143a(d), or expired - non payment of renewal fee or expiry |