CN103018004B - Device and method for measuring hydrodynamic force of fishnet yarn - Google Patents
Device and method for measuring hydrodynamic force of fishnet yarn Download PDFInfo
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- CN103018004B CN103018004B CN201210427550.2A CN201210427550A CN103018004B CN 103018004 B CN103018004 B CN 103018004B CN 201210427550 A CN201210427550 A CN 201210427550A CN 103018004 B CN103018004 B CN 103018004B
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Abstract
The invention provides a device and a method for measuring hydrodynamic force of a fishnet yarn. The device comprises a cuboid-shaped fixing frame; two underwater force measuring devices which are connected with a lower transverse fixing cable are fixed to the bottom surface of one end of the frame; an upper transverse fixing cable is connected between another two underwater force measuring devices which are respectively fixed in clamping grooves at support pillars of the frame in a slide way or fixed to the bottom surface of the other end of the frame; and longitudinal yarns are fixed between the upper transverse fixing cable and the lower transverse fixing cable. The method for measuring the hydrodynamic force of the fishnet yarn comprises the following steps in sequence: adjusting the coming flow and the grids of the yarns to reach any required impulse angles; assembling four corners of the grids of the yarns on the underwater force measuring devices; placing the frame into a sink; and adjusting the positions of the two underwater force measuring devices at the top part of the frame, the length of the longitudinal yarns and the strength of the testing wave flow, so as to obtain the strength of the hydrodynamic force of a single yarn and the hydrodynamic force parameters of the yarn. The device for measuring the hydrodynamic force of the fishnet yarn is simple in structure, easy to assemble and convenient to operate, can be used for measuring the hydrodynamic force of fine yarns, and also can be used for measuring the hydrodynamic force of parts of fishing tools and flexible cylindrical structural matters, such as ropes and nettings.
Description
Technical field
The present invention relates to a kind ofly for measuring netting twine hydrodynamic apparatus and method for fishing, belong to sea fishery technical field.
Background technology
Hydrodynamics of fishing gears performance is one of leading indicator of weighing fishing gear transaction capabilities quality.What form the fishery facilities main parts such as net fishing gear, net cage is the etting being formed by netting twine braiding.Compare with other ocean engineering structures, the distinguishing feature of netting twine is its flexibility, cause thus the effect between fishing gear (etting) and current quite complicated, its change of shape influences each other, interdepends with the hydrodynamic force being subject to, be that hydrodynamic force on fishing gear (etting) and its shape after stressed are closely related, this is the difficult point facing in the Study on hydrodynamic performance of fishing gear (etting).
The method of research hydrodynamics of fishing gears mainly contains model test, marine actual measurement and theoretical calculating (main development is numerical simulation in recent years).Tradition mechanics of fishing gear mainly with net sheet as a whole structure study, by testing definite experimental formula, using this basis of calculating as theory.Due to the difference of experiment condition measuring equipment etc., the general limitation of use of experimental formula is larger.Along with the development of computer technology, combination model test and the theoretical fishing gear numbered analog simulation technology of calculating are also rapidly developed.The fishery facilities hydrodynamic forces such as numerical simulation calculation fishing gear (etting), net cage and shape be generally using mesh order pin (a bit of netting twine) as basic building block, by calculating stressed on each order pin, obtains whole stressing conditions.While calculating the hydrodynamic force on order pin, (compare smooth cylinder, netting twine has sth. made by twisting line to relate to resistance coefficient, lift coefficient and the sideway force coefficient of netting twine, thereby except resistance with rising, also there is side force), when there is nonstationary flow (as wave), also to relate to inertial force coefficient.Because netting twine is soft, diameter is little and the singularity of structure, the research of its hydrodynamic force coefficient needs accurately test design and measuring equipment, and this respect research have not been reported.The relevant achievement in research of the common circle of reference cylinder of these parameters, rete cord aspect, chooses empirical value or calculates or calculate according to the relation between rete cord and the angle of attack according to the relation of the hydrodynamic force coefficient of right cylinder, rete cord and Reynolds number at present.This is considered to carry out up to now the one of the main reasons that mechanics of fishing gear numerical simulation is difficult to reach ideal effect.
Therefore, in order to improve, take the precision of the fishery facilities Study on hydrodynamic performance result that netting twine (etting) is main body, be necessary to carry out the hydrodynamic measuring method exploitation of tiny netting twine, obtain netting twine hydrodynamic drag coefficient, lift coefficient and sideway force coefficient parameter, for the fishery facilities such as net fishing gear, net cage are theoretical, calculate and design and produce and provide support.
Summary of the invention
The object of this invention is to provide a kind ofly for measuring the hydrodynamic apparatus and method of netting twine, for the fishery facilities such as net fishing gear, net cage is theoretical, calculates and design and produce provides underlying parameter, to overcome the deficiencies in the prior art.
A kind of for measuring the hydrodynamic device of netting twine, comprise four device for measuring force under water, and respectively by the lateral column that (is first subject to stream for front) before two, front horizontal foundation, front horizontal fore-set, two square frames that after two, lateral column, rear horizontal foundation, backward fore-set form, is characterized in that two described square frames connect and the fixed frame of formation rectangular shape via two longitudinal fore-sets; In the middle of the lower surface of two described longitudinal fore-sets, respectively have together draw-in groove longitudinally; Wherein, laterally the upper surface two ends of foundation are respectively fixed with a device for measuring force under water, and described two are connected with lower horizontal antilift wire under water between device for measuring force; Two other under water device for measuring force be slidably fixed on respectively in two longitudinal fore-sets draw-in groove separately, or be individually fixed in the upper surface two ends of rear horizontal foundation, and described rear horizontal foundation moves up and down along rear lateral column, two other described in this is also connected with the upper horizontal antilift wire parallel with lower horizontal antilift wire under water between device for measuring force; Described upper, lower horizontal is to being fixed with the many longitudinal netting twines that are parallel to each other between antilift wire.
The cross sectional shape of the draw-in groove of above-mentioned longitudinal fore-set is dovetail groove.
In order to obtain better effect, above-mentioned forward and backward lateral column, forward and backward horizontal foundation, forward and backward horizontal fore-set and longitudinally four sides of fore-set all have dovetail groove; And between described forward and backward lateral column and forward and backward horizontal foundation and forward and backward horizontal fore-set, and be to interconnect by web member between longitudinal fore-set and two quadras, described web member comprises WeiLXing turning, a cross section, two sides, turning is inserted with bolt, and by embedding the bolt bolt head of draw-in groove, each cylinder is interfixed.
Above-mentioned two horizontal antilift wires and and many longitudinal netting twines form netting twine grids, netting twine grid and under water device for measuring force composition measuring system.Obviously can the angle of attack of adjusting incoming flow and netting twine grid can be realized easily by adjusting the height of above-mentioned rear end foundation, also the angle of attack of incoming flow and netting twine grid can be adjusted by adjusting the position of device for measuring force in the draw-in groove of longitudinal fore-set under water.
Above-mentioned device for measuring force under water can be realized by existing device for measuring force, as six component instrument under water, or land device for measuring force is transformed in water and is used, and measures netting twine grid stressed (X/Y/Z direction) of three directions in water.
Upper, lower horizontal is used the larger pallial siphuncles of rigidity such as wire rope to antilift wire, easily fix longitudinal netting twine, and in two maintenance levels between device for measuring force under water.
Said apparatus is used for measuring the hydrodynamic method of netting twine, it is characterized in that comprising the following steps:
First, device for measuring force is under water adjusted to the angle of attack of required incoming flow and netting twine grid;
Secondly, at upper, lower horizontal to being fixed with the many longitudinal netting twines that are parallel to each other between antilift wire;
Again four jiaos of netting twine grids are assemblied in to be fixed on framework four under water on device for measuring force;
Then, framework is placed in experimental tank, by adjusting two of frame roof position, longitudinal network line length and the test wave current size of device for measuring force under water, measuring netting twine grid is 0 degree to the hydrodynamic force under 90 degree and different Action of Wave Current at the angle of attack, thereby obtains hydrodynamic force size and the netting twine hydrodynamic parameter of single netting twine.
Longitudinally netting twine is assemblied in up and down laterally on antilift wire equably according to certain spacing, adjacent two netting twine spacing be greater than its diameter doubly more than, avoid the flow field that fluid produces through netting twine to disturb the impact on measurement effect.
The present invention is simple in structure, assembling easily, convenient operation, not only can be used for measuring tiny netting twine hydrodynamic force, also can be used for measuring fishing gear parts and the flexible column works hydrodynamic forces such as rope, etting, for research fishing gear parts and fishing gear and similar structures thing hydrodynamics characteristic, provide all new measurement mechanisms and measuring method.
Accompanying drawing explanation
Fig. 1 is general structure schematic diagram of the present invention (two under water device for measuring force be fixed on draw-in groove).
Fig. 2 is the cross-sectional structure schematic diagram of lateral column of the present invention, horizontal foundation, horizontal fore-set or longitudinal fore-set.
Fig. 3 is the schematic diagram that each cylinder of the present invention connects by web member.
Fig. 4 is netting twine grid artwork of the present invention.
Fig. 5 be of the present invention two under water device for measuring force be fixed on the structural representation on rear horizontal foundation.
Wherein, 1, anterolateral column, 2, front horizontal foundation, 3, front longitudinal fore-set, 4, rear lateral column, 5, rear horizontal foundation, 6, rear longitudinal fore-set, 7, longitudinal fore-set, 8, draw-in groove, 9, device for measuring force under water, 10, netting twine, 11, lower horizontal antilift wire, 12, upper horizontal antilift wire, 13, web member, 14, bolt.
Embodiment
As shown in Fig. 1～5, a kind of for measuring the hydrodynamic device of netting twine, comprise four device for measuring force 9 under water, and respectively by the lateral column 1 that (is first subject to stream for front) before two, front horizontal foundation 2, front horizontal fore-set 3, two square frames that after two, lateral column 4, rear horizontal foundation 5, backward fore-set 6 form, is characterized in that two described square frames connect and the fixed frame of formation rectangular shape via two longitudinal fore-sets 7; In the middle of the lower surface of two described longitudinal fore-sets 7, respectively have together draw-in groove 8 longitudinally; Wherein, laterally the upper surface two ends of foundation 2 are respectively fixed with a device for measuring force 9 under water, and described two are connected with lower horizontal antilift wire 11 under water between device for measuring force 9; Two other under water device for measuring force 9 be slidably fixed on respectively in two longitudinal fore-sets 7 draw-in groove 8 separately, or be individually fixed in the upper surface two ends of rear horizontal foundation 5, and described rear horizontal foundation 5 moves up and down along rear lateral column 4, two other described in this is also connected with the upper horizontal antilift wire 12 parallel with lower horizontal antilift wire 11 under water between device for measuring force 9; Described upper, lower horizontal is to being fixed with the many longitudinal netting twines 10 that are parallel to each other between antilift wire 11,12.
As shown in Figure 2,3, the cross sectional shape of the draw-in groove 8 of above-mentioned longitudinal fore-set 7 is dovetail grooves.
As shown in Figures 1 to 3, in order to obtain better effect, above-mentioned front and back lateral column 1,4, the horizontal foundation 2,5 in front and back, the horizontal fore-set 3,6 in front and back and longitudinally four sides of fore-set 7 all have dovetail groove; And between described forward and backward lateral column and forward and backward horizontal foundation and forward and backward horizontal fore-set, and be to interconnect by web member 13 between longitudinal fore-set 7 and two quadras, described web member 13 comprises WeiLXing turning, a cross section, two sides, turning is inserted with bolt 14, and by embedding the bolt 14 bolt heads of draw-in groove 8, each cylinder is interfixed.Obviously this design makes can adjust arbitrarily the size of quadra when actual measurement, until adjust to suitable degree, and very easy to use.
As shown in Fig. 1,4 and 5, the longitudinal netting twine 9 of above-mentioned two horizontal antilift wires 11,12 and Duo Gen forms netting twine grid, and netting twine grid and under water device for measuring force 9 form measuring system.Obviously by adjusting the height-adjustable incoming flow of above-mentioned rear horizontal foundation 5 and the angle of attack of netting twine grid, also can adjust by adjusting the position of device for measuring force 9 in the draw-in groove 8 of longitudinal fore-set 7 under water the angle of attack of incoming flow and netting twine grid.
Above-mentioned device for measuring force under water 9 is realized by existing device for measuring force, as six component instrument under water, or land device for measuring force is transformed in water and is used, and measures netting twine grid stressed (X/Y/Z direction) of three directions in water.
Said apparatus is used for measuring the hydrodynamic method of netting twine, it is characterized in that comprising the following steps:
First, device for measuring force 9 is under water adjusted to the angle of attack of required incoming flow and netting twine grid; Just as described above, by adjusting the height of rear horizontal foundation 5, can adjust the height of device for measuring force 9 under water, and then the angle of attack of adjustment incoming flow and netting twine grid, or by adjusting the position in the draw-in groove 8 of longitudinal fore-set 7 of device for measuring force 9 under water, adjust the angle of attack of incoming flow and netting twine grid, can realize the comprehensive adjusting of all angles of incoming flow and the netting twine grid angle of attack, and regulate accurate quick;
Owing to also can adopting web member 13 to connect between each cylinder of the present invention, make equal capable of regulating mutual alignment between each cylinder, be very easy to use;
Secondly, at upper, lower horizontal to being fixed with the many longitudinal netting twines 10 that are parallel to each other between antilift wire 11,12;
Just four jiaos of netting twine grids are assemblied in be fixed on framework four under water on device for measuring force again;
Then, framework is placed in experimental tank, by adjusting two of frame roof position, longitudinally netting twine 10 length and the test wave current size of device for measuring force 9 under water, measuring netting twine grid is 0 degree to the hydrodynamic force under 90 degree and different Action of Wave Current at the angle of attack, thereby utilize prior art to obtain the hydrodynamic force size of single netting twine, parse netting twine hydrodynamic parameter.
Embodiment
As shown in Fig. 1～5, a kind of for measuring netting twine hydrodynamic apparatus, by forward and backward lateral column 1,4, forward and backward horizontal foundation 2,5, forward and backward horizontal fore-set 3,6, longitudinally fore-set 7 forms fixed frame; Described each cylinder (1-7) structure can be identical, if each post (1-7) is four middle cylinders that all have dove-tail form draw-in groove 8 in surface.Between each cylinder (1-7), by L-type web member 13 and bolt 14 thereof, be fixed in the draw-in groove 8 at two ends, form the rectangular shape fixed frame of measurement mechanism.Have two under water device for measuring force 9 be fixed in the draw-in groove 8 at front end foundation 2 two ends; Adjacent lateral column 1 distance of device for measuring force 9 distance between center line is more preferably greater than more than 20cm, to reduce liquid boundary-layer to the impact of measuring under water; The front and back laterally long limit of foundation 2,5 (or forward and backward horizontal fore-set 3,6) are Y-direction, and the horizontal direction vertical with Y-direction is directions X, and Z direction is according to right-handed helix criterion.
Be positioned at the same side of a pair of forward and backward lateral column 1,3 of the same side on identical vertical plane, can be for pressing close to flume wall, guarantee that framework vertical direction is consistent with tank vertical direction Z, forward and backward horizontal fore-set 3,6 is with laterally foundation 2,4 is vertical with forward and backward lateral column 1,3, parallel for determining the directions X of device for measuring force 9 under water and incoming flow, unrestrained direction.Longitudinally fore-set 7 is fixed on forward and backward horizontal fore-set 3,6 by the draw-in groove 8 at two ends, forms measuring fixed frame.
Be fixed on front horizontal foundation 2 two the lower horizontal antilift wires 11 between device for measuring force 9 under water, the upper, lower horizontal between device for measuring force 9 is all parallel with Y-direction to antilift wire 11,12 under water with being fixed on backward foundation 4 two.Upper, lower horizontal is used the larger pallial siphuncles of rigidity such as fine wire ropes to antilift wire 11,12, easily fix longitudinal netting twine 10, and in upper and lower two pairs of maintenance levels between device for measuring force 9 under water.
Longitudinally netting twine 10 is assemblied in upper, lower horizontal on antilift wire 11,12 equably according to certain spacing, and adjacent two netting twine spacing are greater than the more than 10 times of its diameter, avoids the flow field that fluid produces through netting twine to disturb the impact on measurement effect.
By adjust the device for measuring force under water 9 on netting twine 10 length and the longitudinal fore-set draw-in groove 8 of parallel or adjust after the horizontal height of foundation 6 when device for measuring force 9 (assemble two under water), the angle of attack of capable of regulating netting twine grid and current.By different test wave currents is set, can record netting twine hydrodynamic force in 0 degree to 90 degree angle of attack situation, test figure is carried out to theoretical analysis, obtain netting twine hydrodynamic parameter.
Obviously, in practical application, this structure not only can be used for measuring tiny netting twine hydrodynamic force, also can be used for measuring the hydrodynamic forces such as the fishing gear parts such as rope, etting and flexible column works (cable), widens its usable range.When measuring compared with thick line cable, can directly use one of bottom under water one, device for measuring force 9 and top under water device for measuring force 9 directly cable is fixed on to its two ends and measures.In compared with shallow-water tank, can not use longitudinal fore-set 7, directly device for measuring force 9 is fixed on rear horizontal fore-set 5 under water, adjusts the angle of measuring object and current by horizontal fore-set 5 after mobile, carries out experiment measuring.
Claims (4)
1. one kind for measuring the hydrodynamic device of netting twine, comprise four device for measuring force (9) under water, and respectively by two anterolateral columns (1), front horizontal foundation (2), front horizontal fore-set (3), two quadras that lateral column after two (4), rear horizontal foundation (5), rear horizontal fore-set (6) form, is characterized in that two described quadras connect and the fixed frame of formation rectangular shape via two longitudinal fore-sets (7); In the middle of the lower surface of described two longitudinal fore-sets (7), respectively have together draw-in groove (8) longitudinally; Wherein, laterally the upper surface two ends of foundation (2) are respectively fixed with a device for measuring force (9) under water, and described two are connected with lower horizontal antilift wire (11) under water between device for measuring force (9); Two other under water device for measuring force (9) be slidably fixed on respectively in two longitudinal fore-sets (7) draw-in groove (8) separately, or be individually fixed in the upper surface two ends of rear horizontal foundation (5), and described rear horizontal foundation (5) moves up and down along rear lateral column (4), two other described in this is also connected with the upper horizontal antilift wire (12) parallel with lower horizontal antilift wire (11) under water between device for measuring force (9); Described upper, lower horizontal is to being fixed with the many longitudinal netting twines (10) that are parallel to each other between antilift wire (11,12).
2. as claimed in claim 1 for measuring the hydrodynamic device of netting twine, it is characterized in that the cross sectional shape of the draw-in groove (8) of above-mentioned longitudinal fore-set (7) lower surface is dove-tail.
3. as claimed in claim 1 or 2 for measuring the hydrodynamic device of netting twine, it is characterized in that above-mentioned forward and backward lateral column (1,4), forward and backward horizontal foundation (2,5), forward and backward horizontal fore-set (3,6) and longitudinally four sides of fore-set (7) all have dovetail groove; And between described forward and backward lateral column (1,4) and forward and backward horizontal foundation (2,5) and forward and backward horizontal fore-set (3,6), and be to interconnect by web member (13) between longitudinal fore-set (7) and two quadras, described web member (13) comprises WeiLXing turning, a cross section, two sides, turning is inserted with bolt (14), and by embedding bolt (14) the bolt head of draw-in groove (8), each cylinder is interfixed.
4. utilize the hydrodynamic method of measurement device netting twine described in claim 1, it is characterized in that comprising the following steps:
First, under water device for measuring force (9) is adjusted to the angle of attack of required incoming flow and netting twine grid;
Secondly, at upper, lower horizontal to being fixed with the many longitudinal netting twines (10) that are parallel to each other between antilift wire (11,12);
Again four jiaos of netting twine grids are assemblied in to be fixed on framework four under water on device for measuring force (9);
Then, framework is placed in experimental tank, by adjusting two of frame roof position, longitudinally netting twine (10) length and the test wave current size of device for measuring force (9) under water, measuring netting twine grid is 0 degree to the hydrodynamic force under 90 degree and different Action of Wave Current at the angle of attack, thereby obtains hydrodynamic force size and the netting twine hydrodynamic parameter of single netting twine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201210427550.2A CN103018004B (en) | 2012-10-31 | 2012-10-31 | Device and method for measuring hydrodynamic force of fishnet yarn |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210427550.2A CN103018004B (en) | 2012-10-31 | 2012-10-31 | Device and method for measuring hydrodynamic force of fishnet yarn |
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| CN103018004A CN103018004A (en) | 2013-04-03 |
| CN103018004B true CN103018004B (en) | 2014-11-26 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107843407A (en) * | 2017-12-05 | 2018-03-27 | 西南交通大学 | A kind of clump of piles apparatus for adjusting position for structure hydrodynamic experiment |
| CN110174236B (en) * | 2019-06-14 | 2020-10-02 | 大连海事大学 | Rope-driven-based bottom-sitting type multi-degree-of-freedom hydrodynamic force measuring system |
| CN113203542A (en) * | 2021-05-07 | 2021-08-03 | 中国船舶科学研究中心 | Netting hydrodynamic test device and test method |
| CN114847206B (en) * | 2022-05-31 | 2024-01-12 | 上海交通大学 | Rotatable netting device for studying hydrodynamic force |
| CN114894437B (en) * | 2022-06-07 | 2023-03-17 | 上海交通大学 | Test device for researching coupling hydrodynamic characteristics of stand column-netting structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| SU1405756A1 (en) * | 1986-09-18 | 1988-06-30 | Научно-Производственное Объединение По Технике Промышленного Рыболовства | Stand for spatial simulation of models of trawls in flume |
| CN101672741B (en) * | 2008-09-08 | 2011-09-21 | 中国水产科学研究院东海水产研究所 | Method for testing stress and deformation of meshes of fishing net |
| CN102313637B (en) * | 2011-08-12 | 2013-05-22 | 上海交通大学 | Bidirectional forced vibration experimental apparatus for FISHFARM buoy segment model under action of inclined uniform flow |
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