CN113203542A - Netting hydrodynamic test device and test method - Google Patents
Netting hydrodynamic test device and test method Download PDFInfo
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- CN113203542A CN113203542A CN202110493214.7A CN202110493214A CN113203542A CN 113203542 A CN113203542 A CN 113203542A CN 202110493214 A CN202110493214 A CN 202110493214A CN 113203542 A CN113203542 A CN 113203542A
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- 238000012360 testing method Methods 0.000 title claims abstract description 44
- 238000010998 test method Methods 0.000 title claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000012530 fluid Substances 0.000 claims description 15
- 230000001133 acceleration Effects 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 4
- 238000013461 design Methods 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 description 3
- 238000009395 breeding Methods 0.000 description 2
- 230000001488 breeding effect Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009313 farming Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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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
- G01M10/00—Hydrodynamic testing; Arrangements in or on ship-testing tanks or water tunnels
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- General Physics & Mathematics (AREA)
- Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)
Abstract
The net water power test device comprises a flat plate, a plurality of spaced measuring devices are mounted on the top surface of the flat plate, a main frame is mounted on the bottom surface of the flat plate, and the main frame is structurally characterized in that: the horizontal bar and the vertical bars are encircled to form a quadrilateral structure, the horizontal bar positioned at the top is fixed with the bottom surface of the flat plate, a transverse supporting rod is arranged between the two vertical bars, and an inclined supporting rod is arranged at one end of the transverse supporting rod and the joint of the horizontal bar and the vertical bars; the vertical rod is sequentially provided with a plurality of supporting rods at intervals from top to bottom, one end of each supporting rod is provided with a clamping ring, the clamping ring is connected to the vertical rod through a fixing pin, the other end of each supporting rod is provided with a screw hole, the pipe wall of each screw hole is provided with a corresponding through hole, and a fixing cable penetrates through the through holes and is locked by a clamping pin; the netting is connected to the fixed cable, so that interference of the device to incoming flow and incoming waves can be avoided, and the test precision is improved; meanwhile, the net is convenient to replace in the test, and the test efficiency is improved.
Description
Technical Field
The invention relates to the technical field of hydrodynamic tests, in particular to a netting hydrodynamic test device and a test method.
Background
The netting is a key component of fishery breeding equipment, and the hydrodynamic characteristics of the netting are concerned about the safe use of the netting and the success or failure of fishery breeding. Fishery farming equipment is required to face the action of waves and water currents, and therefore experimental research is required on the hydrodynamic characteristics of the netting under the waves and the water currents.
When the hydrodynamic test of the netting is carried out, the netting is fixed at a specific position in a water tank or a water pool by adopting a frame structure at present, and then the hydrodynamic load borne by the netting and the deformation state of the netting are tested. The device has a certain disturbing effect on waves and currents, which has a certain influence on the test results, and changing netting is time consuming. Therefore, in order to improve the accuracy and the test efficiency of the net water power test, a net water power test device needs to be provided.
Disclosure of Invention
The applicant provides a netting water power test device and a test method aiming at the defects in the prior art, so that the interference of the device to incoming flow and incoming waves can be avoided, and the test precision is improved; meanwhile, the net is convenient to replace in the test, and the test efficiency is improved.
The technical scheme adopted by the invention is as follows:
a netting hydrodynamic test device comprises a flat plate, a plurality of spaced measuring devices are arranged on the top surface of the flat plate, a main frame is arranged on the bottom surface of the flat plate,
the main frame is structurally characterized in that: the horizontal bar and the vertical bars are encircled to form a quadrilateral structure, the horizontal bar positioned at the top is fixed with the bottom surface of the flat plate, a transverse supporting rod is arranged between the two vertical bars, and an inclined supporting rod is arranged at one end of the transverse supporting rod and the joint of the horizontal bar and the vertical bars;
the vertical rod is sequentially provided with a plurality of supporting rods at intervals from top to bottom, one end of each supporting rod is provided with a clamping ring, the clamping ring is connected to the vertical rod through a fixing pin, the other end of each supporting rod is provided with a screw hole, the pipe wall of each screw hole is provided with a corresponding through hole, and a fixing cable penetrates through the through holes and is locked by a clamping pin;
the netting is connected to the fixing rope.
The further technical scheme is as follows:
the included angle between the support rod and the plane of the main frame is adjusted at will through the snap ring.
The length of each strut is the same.
Each strut has a different length.
The supporting rod is of a long strip-shaped structure, a clamping ring is welded at one end of the supporting rod, a screw hole is formed in the other end of the supporting rod, a clamping pin is installed in the screw hole in a matched mode, and a pin with threads is screwed into the screw hole.
A test method of a netting hydrodynamic test device comprises the following operation steps:
the first step is as follows: cutting the netting into a design size according to the requirements of the test outline;
the second step is that: installing the transverse supporting rods and the inclined supporting rods on the main framework, wherein the transverse supporting rods and the inclined supporting rods enhance the rigidity of the main framework;
the third step: fixing the support rod to the main frame by using a fixing pin;
the fourth step: according to the size of the netting, the position of the support rod is adjusted to meet the installation requirement of the netting, and the clamp ring is locked;
the fifth step: the net is stretched and pulled on the supporting rod by adopting a fixing rope, the fixing rope uniformly penetrates through meshes on the edge of the net in the connection process, the fixing rope is a flexible rope with a smaller diameter, the fixing rope is stretched and fixed by the supporting rod, and the fixing rope can fix the net;
and a sixth step: further adjusting the position of the support rod, flattening the netting, and having initial pretension, and screwing down a bayonet lock to prevent the fixed rope from shifting, wherein the bayonet lock is a component used for limiting the fixed rope at the end part of the support rod, and the detachable fixed rope is screwed down or loosened by the bayonet lock;
the seventh step: installing a measuring device, wherein the measuring device is installed above the main frame through a connecting piece, and the measuring device is an instrument for measuring hydrodynamic load borne by the netting;
eighth step: installing the whole test device at the designated position of a water tank or a water pool, connecting a data acquisition system, and preparing to start a test;
the ninth step: starting a data acquisition system, and acquiring fluid load, fluid speed and acceleration of the netting when wave generation or flow generation is carried out;
the tenth step: and analyzing the fluid load borne by the netting, and calculating the resistance coefficient and the inertia coefficient of the netting according to the parameters of the netting, the fluid load, the fluid speed and the acceleration.
The invention has the following beneficial effects:
the invention has compact and reasonable structure and convenient operation, and can conveniently finish the test work of the water power of the netting by the cooperation of the main frame, the supporting rod, the measuring device and the like.
The invention reduces the interference effect of the frame and other members on the flow field and improves the accuracy of the netting hydrodynamic test. The invention can realize the measurement of the net water power under different included angles by adjusting the length difference of the supporting rods.
The invention has simple structure, realizes the spatial separation of the main frame and the netting, reduces the interference effect of the main frame rod piece on incoming flow and incoming waves, and can improve the hydrodynamic test precision of the netting.
Drawings
Fig. 1 is a front view of the present invention.
Fig. 2 is a side view of fig. 1.
Fig. 3 is a schematic structural view of the strut of the present invention.
Figure 4 is an exploded view of the strut of the present invention.
Figure 5 is a front view of the strut of the present invention.
Wherein: 1. a main frame; 2. a transverse stay bar; 3. a diagonal brace; 4. a strut; 5. a snap ring; 6. a fixed cable; 7. a fixing pin; 8. a bayonet lock; 9. penetrating through the hole; 10. a measuring device; 11. a flat plate; 12. a vertical rod; 13. a cross bar; 14. netting; 15. and a screw hole.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings.
As shown in fig. 1 to 5, the water power test device for netting of the present embodiment includes a plate 11, a plurality of spaced measuring devices 10 installed on a top surface of the plate 11, a main frame 1 installed on a bottom surface of the plate 11,
the main frame 1 has the structure that: the foldable support comprises a quadrilateral structure formed by enclosing two cross rods 13 and two vertical rods 12, wherein the cross rods 13 positioned at the top are fixed with the bottom surface of a flat plate 11, a transverse supporting rod 2 is arranged between the two vertical rods 12, and an inclined supporting rod 3 is arranged at one end of the transverse supporting rod 2 and the joint of the cross rods 13 and the vertical rods 12;
a plurality of supporting rods 4 are sequentially arranged on a vertical rod 12 from top to bottom at intervals, a clamping ring 5 is arranged at one end of each supporting rod 4, the clamping ring 5 is connected to the vertical rod 12 through a fixing pin 7, a screw hole 15 is formed in the other end of each supporting rod 4, a corresponding through hole 9 is formed in the pipe wall of each screw hole 15, a fixing cable 6 penetrates through each through hole 9, and the fixing cable is locked by a clamping pin 8;
the netting 14 is attached to the fixing cable 6.
The included angle between the support rod 4 and the plane of the main frame 1 is adjusted at will through the snap ring 5.
Each strut 4 is of the same length.
Each strut 4 is of different length.
The supporting rod 4 is of a long strip-shaped structure, a clamping ring 5 is welded at one end of the supporting rod 4, a screw hole 15 is formed in the other end of the supporting rod 4, a clamping pin 8 is installed in the screw hole 15 in a matched mode, and a pin with threads is screwed into the screw hole 15 at the position of the clamping pin 8.
The specific structure and function of the invention are as follows:
the device mainly comprises a main frame 1, a support rod 4, a clamping ring 5, a fixing rope 6, a fixing pin 7, a clamping pin 8, a measuring device 10 and a flat plate 11.
The main frame 1 is composed of vertical rods 12, cross rods 13, transverse supporting rods 2 and inclined supporting rods 3, and occupies a small space.
One end of the supporting rod 4 is provided with a clamping ring 5, the other end of the supporting rod is provided with a screw hole 15, the supporting rod 4 is connected to the main frame 1 through the clamping ring 5 and the fixing pin 7, and the included angle between the supporting rod 4 and the plane of the main frame 1 can be adjusted according to the test requirement.
The lengths of the supporting rods 4 at different positions on the main frame 1 can be the same or different, and the netting 14 and incoming waves or incoming flows can form different included angles by adjusting the lengths of the supporting rods 4, so that the test precision is ensured.
The netting 14 is attached to the fixing cable 6.
The fixing cable 6 is passed through the support rod 4 through the through hole 9, and the fixing cable 6 is fixed to the support rod 4 by a pin 8, wherein the pin 8 is a pin with screw threads which can be screwed into a screw hole 15 at the top end of the support rod 4, thereby fixing the fixing cable 6 to the support rod 4.
A flat plate 11 is arranged above the main frame 1, a measuring device 10 is arranged above the flat plate 11, and the position and the number of the measuring device 10 can be adjusted according to test requirements.
The number and the position of the supporting rods 4 can be adjusted according to the test requirements, and the supporting rods 4 can be arranged on the transverse supporting rods 2 and the inclined supporting rods 3.
The support rod 4 of the present invention needs to be firmly connected to the main frame 1.
The included angle between the supporting rod 4 and the plane of the main frame 1 can be adjusted at will, meanwhile, the lengths of the supporting rods 4 at different positions can be the same or different, and the netting and incoming waves or incoming flows can form different included angles by adjusting the lengths of the supporting rods 4.
The netting 14 of the invention is connected to the support rod 4 by the fixing rope 6, thus realizing the spatial separation with the main frame 1.
The main frame 1 comprises vertical rods 12, cross rods 13, transverse supporting rods 2, inclined supporting rods 3 and the like, a structural system with high rigidity is formed, and the main frame 1 can keep the shape unchanged under the action of water flow or waves.
The testing method of the netting water power testing device comprises the following operation steps:
the first step is as follows: cutting the netting 14 into a design size according to the requirements of the test outline;
the second step is that: installing the transverse supporting rods 2 and the inclined supporting rods 3 on the main framework 1, wherein the transverse supporting rods 2 and the inclined supporting rods 3 reinforce the rigidity of the main framework 1;
the third step: fixing the support rod 4 on the main frame 1 by using a fixing pin 7;
the fourth step: according to the size of the netting 14, the position of the support rod 4 is adjusted to meet the installation requirement of the netting 14, and the clamp ring 5 is locked;
the fifth step: the netting 14 is stretched on the supporting rod 4 by adopting the fixing rope 6, the fixing rope 6 uniformly penetrates through meshes on the edge of the netting 14 in the connection process, the fixing rope 6 is a flexible rope with a small diameter, the fixing rope is stretched and fixed by the supporting rod 4, and the netting 14 can be fixed by the fixing rope 6;
and a sixth step: further adjusting the position of the support rod 4, flattening the netting 14 and having an initial pre-tension, tightening the clamp 8 to prevent the fixing rope 6 from being displaced, wherein the clamp 8 is a component for limiting the fixing rope 6 at the end of the support rod 4, and the fixing rope 6 can be disassembled by tightening or loosening the clamp 8;
the seventh step: installing a measuring device 10, wherein the measuring device 10 is installed above the main frame 1 through a connecting piece, and the measuring device 10 is an instrument for measuring hydrodynamic load borne by the netting 14;
eighth step: installing the whole test device at the designated position of a water tank or a water pool, connecting a data acquisition system, and preparing to start a test;
the ninth step: starting a data acquisition system, and acquiring the fluid load and the fluid speed and acceleration of the netting 14 during wave generation or flow generation;
the tenth step: the fluid load experienced by the netting 14 is analyzed and the drag coefficient and inertial coefficient of the netting 14 are calculated from the parameters of the netting 14, the fluid load, the fluid velocity, and the acceleration.
The above description is intended to be illustrative and not restrictive, and the scope of the invention is defined by the appended claims, which may be modified in any manner within the scope of the invention.
Claims (6)
1. The utility model provides a netting hydrodynamic test device which characterized in that: comprises a flat plate (11), a plurality of spaced measuring devices (10) are arranged on the top surface of the flat plate (11), a main frame (1) is arranged on the bottom surface of the flat plate (11),
the main frame (1) is structurally characterized in that: the foldable support is characterized by comprising a quadrilateral structure formed by enclosing two cross rods (13) and two vertical rods (12), wherein the cross rods (13) positioned at the top are fixed with the bottom surface of a flat plate (11), a transverse stay bar (2) is arranged between the two vertical rods (12), and an inclined stay bar (3) is arranged at the joint of one end of the transverse stay bar (2) and the cross rods (13) with the vertical rods (12);
the vertical rod (12) is sequentially provided with a plurality of supporting rods (4) from top to bottom at intervals, one end of each supporting rod (4) is provided with a clamping ring (5), each clamping ring (5) is connected to the corresponding vertical rod (12) through a fixing pin (7), the other end of each supporting rod (4) is provided with a screw hole (15), the pipe wall of each screw hole (15) is provided with a corresponding through hole (9), and a fixing cable (6) penetrates through each through hole (9) and is locked by a clamping pin (8);
the netting (14) is connected to the fixing rope (6).
2. The net water power test device of claim 1, wherein: the included angle between the support rod (4) and the plane of the main frame (1) is adjusted at will through the snap ring (5).
3. The net water power test device of claim 1, wherein: the length of each strut (4) is the same.
4. The net water power test device of claim 1, wherein: the length of each strut (4) is different.
5. The net water power test device of claim 1, wherein: the supporting rod (4) is of a long strip-shaped structure, a clamping ring (5) is welded at one end of the supporting rod (4), a screw hole (15) is formed in the other end of the supporting rod (4), a clamping pin (8) is installed in the screw hole (15) in a matched mode, and a pin with threads is screwed into the screw hole (15) on the clamping pin (8).
6. A test method using the net water power test device according to claim 1, characterized in that: the method comprises the following operation steps:
the first step is as follows: cutting the netting (14) into a design size according to the requirements of the test outline;
the second step is that: installing the transverse supporting rod (2) and the inclined supporting rod (3) on the main frame (1), wherein the transverse supporting rod (2) and the inclined supporting rod (3) reinforce the rigidity of the main frame (1);
the third step: fixing the support rod (4) to the main frame (1) by a fixing pin (7);
the fourth step: according to the size of the netting (14), the position of the support rod (4) is adjusted to meet the installation requirement of the netting (14), and the snap ring (5) is locked;
the fifth step: the net (14) is stretched on the supporting rod (4) by adopting the fixing rope (6), the fixing rope (6) uniformly penetrates through meshes on the edge of the net (14) in the connection process, the fixing rope (6) is a flexible rope with a smaller diameter, the fixing rope is stretched and fixed by the supporting rod (4), and the fixing rope (6) can fix the net (14);
and a sixth step: further adjusting the position of the support rod (4), flattening the netting (14) and having initial pretension, tightening a clamping pin (8) to prevent the fixing rope (6) from shifting, wherein the clamping pin (8) is a component used for limiting the fixing rope (6) at the end part of the support rod (4), and the fixing rope can be disassembled by tightening or loosening the clamping pin (8);
the seventh step: installing a measuring device (10), and installing the measuring device (10) above the main frame (1) through a connecting piece, wherein the measuring device (10) is an instrument for measuring hydrodynamic load borne by the netting (14);
eighth step: installing the whole test device at the designated position of a water tank or a water pool, connecting a data acquisition system, and preparing to start a test;
the ninth step: starting a data acquisition system, and acquiring fluid load, fluid speed and acceleration on the netting (14) during wave generation or flow generation;
the tenth step: the fluid load to which the netting (14) is subjected is analyzed and the drag coefficient and the inertia coefficient of the netting (14) are calculated from the parameters of the netting (14), the fluid load, the fluid velocity and the acceleration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110493214.7A CN113203542A (en) | 2021-05-07 | 2021-05-07 | Netting hydrodynamic test device and test method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110493214.7A CN113203542A (en) | 2021-05-07 | 2021-05-07 | Netting hydrodynamic test device and test method |
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| Publication Number | Publication Date |
|---|---|
| CN113203542A true CN113203542A (en) | 2021-08-03 |
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ID=77030263
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110493214.7A Pending CN113203542A (en) | 2021-05-07 | 2021-05-07 | Netting hydrodynamic test device and test method |
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| Country | Link |
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| CN (1) | CN113203542A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114847206A (en) * | 2022-05-31 | 2022-08-05 | 上海交通大学 | Rotatable net device for researching hydrodynamic force |
| CN114894437A (en) * | 2022-06-07 | 2022-08-12 | 上海交通大学 | Test device for researching coupling hydrodynamic characteristics of stand column-netting structure |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103018004A (en) * | 2012-10-31 | 2013-04-03 | 中国海洋大学 | Device and method for measuring hydrodynamic force of fishnet yarn |
| CN204882030U (en) * | 2015-04-17 | 2015-12-16 | 上海海洋大学 | Experimental device for a water dynamic parameters for determining net piece and rete cord |
| CN209485407U (en) * | 2019-03-13 | 2019-10-11 | 上海海洋大学 | Detachable hydrodynamic parameter tests frame |
| CN111274728A (en) * | 2020-01-19 | 2020-06-12 | 中国船舶科学研究中心（中国船舶重工集团公司第七0二研究所） | Method for analyzing hydro-elastic response of netting and floating body coupling |
-
2021
- 2021-05-07 CN CN202110493214.7A patent/CN113203542A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103018004A (en) * | 2012-10-31 | 2013-04-03 | 中国海洋大学 | Device and method for measuring hydrodynamic force of fishnet yarn |
| CN204882030U (en) * | 2015-04-17 | 2015-12-16 | 上海海洋大学 | Experimental device for a water dynamic parameters for determining net piece and rete cord |
| CN209485407U (en) * | 2019-03-13 | 2019-10-11 | 上海海洋大学 | Detachable hydrodynamic parameter tests frame |
| CN111274728A (en) * | 2020-01-19 | 2020-06-12 | 中国船舶科学研究中心（中国船舶重工集团公司第七0二研究所） | Method for analyzing hydro-elastic response of netting and floating body coupling |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114847206A (en) * | 2022-05-31 | 2022-08-05 | 上海交通大学 | Rotatable net device for researching hydrodynamic force |
| CN114847206B (en) * | 2022-05-31 | 2024-01-12 | 上海交通大学 | Rotatable netting device for studying hydrodynamic force |
| CN114894437A (en) * | 2022-06-07 | 2022-08-12 | 上海交通大学 | Test device for researching coupling hydrodynamic characteristics of stand column-netting structure |
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Application publication date: 20210803 |