CN114894437A - Test device for researching coupling hydrodynamic characteristics of stand column-netting structure - Google Patents
Test device for researching coupling hydrodynamic characteristics of stand column-netting structure Download PDFInfo
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- CN114894437A CN114894437A CN202210636659.0A CN202210636659A CN114894437A CN 114894437 A CN114894437 A CN 114894437A CN 202210636659 A CN202210636659 A CN 202210636659A CN 114894437 A CN114894437 A CN 114894437A
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/16—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring several components of force
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- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/80—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in fisheries management
- Y02A40/81—Aquaculture, e.g. of fish
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Abstract
The invention discloses a test device for researching the coupling hydrodynamic characteristics of an upright post-netting structure, which comprises an integral supporting frame, a netting angle adjusting device, a netting moving device, a telescopic rod, a six-component force sensor, a connecting rod, a netting frame, a netting and an upright post, wherein the netting angle adjusting device is arranged on the integral supporting frame; the integral supporting frame plays a supporting role for the experimental device; the included angle between the netting can be accurately adjusted through the netting angle adjusting device; the netting moving device is arranged on the integral supporting frame and can move on the integral supporting frame; the other end of the telescopic rod is fixedly connected with the six-component force sensor; the six-component force sensor is fixedly connected with the connecting rod; the connecting rod is fixedly connected with the netting frame; two ends of the upright post are respectively fixedly connected with the connecting rod; the netting is fixed in the netting frame. The invention realizes various combinations of the upright post structure and the netting structure through modular and detachable design, and provides a test device with more functions to meet the required test working condition.
Description
Technical Field
The invention relates to the field of ship and ocean engineering, in particular to a test device for researching the coupling hydrodynamic characteristics of a deep and open sea aquaculture equipment upright post-netting structure.
Background
In recent years, the net cage culture industry is rapidly developed, and the research on the net cages is started in China. Due to limitations in offshore farming space and increasingly serious environmental problems, mariculture is gradually advancing to the deep sea field. The semi-submersible type cultivation equipment is a typical deep and open sea cultivation equipment and is structurally characterized by being of a combined structure of an integral rigid frame and multiple meshes. The research on the specific hydrodynamic characteristics of the net cage in the marine environment is still limited, and at present, the hydrodynamic calculation of the net cage generally solves the external frame and the net structure separately, and then the overall structure stress is obtained by superposition, and the hydrodynamic interaction between the frame and the net is not considered. Most of the net cage frames at home and abroad are cylindrical structures, and the whole net cage frame is composed of a plurality of net clothes-upright posts-net clothes structures from local view, so that the understanding of the coupling hydrodynamic characteristics of the upright posts-net clothes structures is a current research hotspot.
In studying the hydrodynamic characteristics of the netting structure, model testing is a very critical research method. In general, research on the hydrodynamic force of the netting is generally divided into flow field and force measurement, that is, the change of the flow field before and after the water flow passes through the structure of the netting and the change of the force applied to the netting are researched. The devices to be used are force sensors and PIV gauges. At present, model devices used at home and abroad mainly adopt a single-net device, the device is simple and easy to install, but the net devices cannot meet the test conditions in consideration of more net parameters and environment variables, such as included angles between nets and flows, multi-net systems, combination of nets and other structures and the like. Therefore, in studying the hydrodynamic characteristics of the pillar-netting structure, a more versatile test apparatus is needed to meet the required test conditions.
Therefore, those skilled in the art are dedicated to develop a novel test device for studying the hydrodynamic characteristics of the column-net structure coupling of deep-open sea farming equipment.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the technical problem to be solved by the present invention is how to implement various combinations of a pillar structure and a net structure by a modular and detachable design, so as to provide a testing device with more functions to meet the required testing conditions in the research of hydrodynamic characteristics of the pillar-net structure.
In order to achieve the aim, the invention provides a test device for researching the hydrodynamic characteristics of a column-netting structure coupling, which is characterized by comprising an integral supporting frame, a netting angle adjusting device, a netting moving device, a telescopic rod, a six-component force sensor, a connecting rod, a netting frame, a netting and a column; the integral supporting frame is of a frame type structure and plays a supporting role for the experimental device; one end of the netting angle adjusting device is fixedly connected with the netting moving device, the other end of the netting angle adjusting device is fixedly connected with the telescopic rod, and the included angle between the netting can be accurately adjusted through the netting angle adjusting device; the netting moving device is arranged on the integral supporting frame and can move on the integral supporting frame; the telescopic rod is fixedly connected with the six-component force sensor; the six-component force sensor is fixedly connected with the connecting rod; the connecting rod is fixedly connected with the netting frame; the netting is fixed in the netting frame; the two ends of the upright post are respectively fixedly connected with the connecting rod.
Furthermore, the whole supporting frame is composed of an aluminum alloy frame, the length direction of the upper end of the whole supporting frame is long, the cross beams extending out of the two ends of the whole supporting frame can be transversely arranged on the water tank and used for being placed in a suspension mode, and the bottom of the whole supporting frame is provided with a foot pad and can be used for being placed in a bottom sitting mode.
Furthermore, the netting angle adjusting device is provided with an angle scale at the top and the bottom of each netting frame, so that the included angle between two netting frames can be accurately adjusted, the netting angle adjusting device further comprises a lantern ring, the lantern ring is matched with the telescopic rod, the telescopic rod can rotate in the lantern ring, and the lantern ring is fixedly connected with the netting moving device through an elastic thread, so that the rotating function is realized.
Further, a set of the netting moving devices is respectively arranged at the top and the bottom of each netting frame, each netting moving device comprises a sliding beam, a sliding plate and a sliding block, the sliding beams are fixedly connected with the integral supporting frame through bolts which can be screwed, the sliding plates are fixed on the sliding beams through the sliding blocks and the bolts embedded in grooves of the sliding beams, and the netting is moved by moving the sliding beams and the sliding plates.
Furthermore, the telescopic rod is made of a plurality of hollow round rods with the diameters being reduced in sequence, the nested hollow round rods can move mutually and are fixed through bolts, and an indicating arrow is arranged at the top end of the telescopic rod close to one end of the netting angle adjusting device and used for displaying the current angle.
Furthermore, the six-component force sensor can measure stress and bending moment in three directions under the current state, the top and the bottom of the netting frame and the upright post are respectively provided with one sensor, and two ends of the six-component force sensor are respectively fixedly connected with the telescopic rod and the connecting rod through bolts.
Further, the netting frame is made of stainless steel, the cross section of the frame is circular to reduce the influence on the surrounding flow state, and small holes are formed in the inner side of the frame and used for fixing the netting.
Further, the net is printed by the resin material 3d, and may be replaced by other materials.
The net-upright column structure comprises a whole supporting frame, a rod piece and a guide structure, wherein the whole supporting frame is provided with a water inlet and a water outlet, the guide structure is arranged to wrap the underwater part of the whole supporting frame, and the influence of water flow change near the rod piece on the hydrodynamic force of the net-upright column structure is reduced through a streamline design.
Furthermore, the upright post is of a hollow unsealed structure and is fixedly connected with the connecting rod through screw holes at the upper end and the lower end.
Compared with the traditional method and device, the invention has the following beneficial effects:
the invention combines the upright post structure and the netting structure based on modularized and detachable design in a hydrodynamic experiment for measuring the upright post-netting structure. The angle and position of the netting can be adjusted, the netting can adapt to various working conditions, and the placing mode of the device can be changed to adapt to different test places; the fixing of the netting frames with different sizes is realized by changing the length of the telescopic rod, so that the working condition of the netting test has high expandability. In an actual test, research on hydrodynamic interaction between the netting and the stand column is realized based on three working conditions, namely, the netting and the stand column are arranged at the same time, and only the netting and only the stand column are arranged.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
Drawings
FIG. 1 is a schematic front view of a preferred embodiment of the present invention;
FIG. 2 is a perspective view of a preferred embodiment of the present invention;
FIG. 3 is a schematic view of a device for adjusting the angle of a net according to a preferred embodiment of the present invention;
FIG. 4 is a schematic view of a bottom end netting shifting apparatus according to a preferred embodiment of the present invention;
fig. 5 is a schematic view of an upper netting moving device according to a preferred embodiment of the present invention.
The device comprises a supporting frame 1, a netting angle adjusting device 2, a netting moving device 3, a telescopic rod 4, a six-component force sensor 5, a connecting rod 6, a netting frame 7, a netting 8, a flow guide structure 9 and an upright post 10.
Detailed Description
The technical contents of the preferred embodiments of the present invention will be more clearly and easily understood by referring to the drawings attached to the specification. The present invention may be embodied in many different forms of embodiments and the scope of the invention is not limited to the embodiments set forth herein.
In the drawings, structurally identical elements are represented by like reference numerals, and structurally or functionally similar elements are represented by like reference numerals throughout the several views. The size and thickness of each component shown in the drawings are arbitrarily illustrated, and the present invention is not limited to the size and thickness of each component. The thickness of the components may be exaggerated where appropriate in the figures to improve clarity.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims at a novel test device for researching the coupling hydrodynamic characteristics of a stand column-netting structure of deep and open sea aquaculture equipment, and aims to provide a test device with more functions to meet the working conditions required by a stand column-netting combined structure test.
In the actual hydrodynamic process of measuring the upright post-netting structure, the whole device is placed in a circulating water tank, and the netting and the upright post structure are immersed below the water surface by a certain height to avoid the influence of the free liquid level. And meanwhile, a pitot tube arranged in front of the device, a force sensor connected with the netting and the stand column and a PIV measuring instrument can realize measurement of the whole flow field, flow velocity, the netting and the stand column stress. The device mainly comprises an integral supporting frame, a netting angle adjusting device, a netting moving device, a telescopic rod, a six-component force sensor, a connecting rod, a netting frame, a netting, a guide plate, an upright post and the like. The integral supporting frame has two supporting modes, and a test device can be placed in a bottom sitting mode and a suspension mode; the netting angle adjusting device is connected with the integral supporting frame through the netting moving device and can move on the supporting frame, the netting angle adjusting device is provided with a dial for displaying an angle, and a rod connected with the netting is rotated by controlling the tightness of a screw; the telescopic rod is connected with the netting angle adjusting device and the six-component force sensor, and the fixing device can be used for fixing netting frames of different sizes through adjusting the length of the telescopic rod; the six-component force sensor is used for measuring the stress of the netting and the upright post; the netting frame is used for fixing the netting and is connected with the whole device; the diversion structure reduces the influence of the water flow change near the rod on the hydrodynamic force of the netting-upright post structure through a streamline design.
The invention is realized by the following technical scheme, as shown in figure 1, the device of the invention comprises: the device comprises an integral supporting frame 1, a netting angle adjusting device 2, a netting moving device 3, a telescopic rod 4, a six-component force sensor 5, a connecting rod 6, a netting frame 7, a netting 8, a flow guide structure 9 and a stand column 10. Wherein: the integral supporting frame 1 is a fixed support of the whole netting test device and is connected with an internal netting structure through a netting moving device 3; the netting angle adjusting device 2 is an important module for realizing the function of changing the included angle of two netting, the top and the bottom of each netting frame are respectively provided with a set of device, one end of the device is fixed on the netting moving device 3, and the other end of the device is connected with the netting frame 7 through the telescopic rod 4; the telescopic rod 4 is connected with the netting moving device 3 and the six-component force sensor 5; the connecting rod 6 is connected with the six-component force sensor 5 and the netting frame 7; the netting 8 is fixed in the netting frame 7; the flow guide structure 9 is arranged to be wrapped on the underwater part of the integral supporting frame 1; the two ends of the upright post 10 are fixedly connected with the connecting rod 6.
Whole braced frame 1 comprises aluminum alloy frame, and the length direction of upper end is longer, and the crossbeam that stretches out at both ends can transversely be arranged on the basin for the suspension type is placed, and the bottom is equipped with a plurality of callus on the sole, can be used to sit the end formula and place.
As shown in fig. 3, the netting angle adjusting device 2 is provided with an angle scale at the top and the bottom of each netting, and can accurately adjust the included angle between the two netting, the netting angle adjusting device 2 comprises a lantern ring, the lantern ring is matched with the telescopic rod 4, the telescopic rod 4 can rotate in the lantern ring, and the lantern ring is fixedly connected to the sliding plate of the netting moving device 3 through screws capable of being loosened, so that the rotating function is realized.
As shown in fig. 4 and 5, the netting moving device 3 is composed of a sliding beam, a sliding plate and a sliding block, wherein a set is arranged at the top and the bottom of the netting moving device, the sliding beam is fixed on the main cross beam of the integral supporting frame 1 through a bolt which can be screwed, and the sliding plate is fixed on the sliding beam through the sliding block and the bolt which are embedded in the groove of the sliding beam. The movement of the netting is achieved by moving the sliding beam and the sliding plate which is fixedly connected with the netting angle adjusting device 2.
The telescopic rod 4 is made of a plurality of hollow round rods with the diameters reduced in sequence, the nested hollow round rods can move mutually and are fixed through bolts, the top end of the telescopic rod at the top is provided with an indicating arrow for displaying the current angle, and the tail end of the telescopic rod is connected with the six-component force sensor 5.
The six-component force sensor 5 can measure the stress and bending moment in three directions under the current state, and is respectively assembled at the top and the bottom of the netting frame 7 and the upright post 10 and connected with the telescopic rod 4 and the connecting rod 6 through bolts.
The connecting rod 6 is made of a solid thin iron rod, has certain rigidity, is provided with a screw hole at the tail end and is fixedly connected with the netting frame 7.
The netting frame 7 is made of stainless steel and the frame cross section is circular to reduce the effect on the surrounding flow pattern. The inner side of the frame is provided with a small hole for fixing the netting 8.
The net 8 is printed with the resin material 3d, and may be replaced with another material.
As shown in fig. 2, the diversion structure 9 may be subdivided into a streamline flow guide plate wrapped on four vertical columns of the support frame 1 and a streamline rubber diversion strip wrapping all bottom frames of the support frame 1, and the diversion structure 9 reduces the influence of the water flow change near the rod members on the hydrodynamic force of the netting-vertical column structure through a streamline design.
The upright post 10 is a hollow unsealed structure and is fixedly connected with the connecting rod 6 through screw holes at the upper end and the lower end.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (10)
1. A test device for researching the coupling hydrodynamic characteristics of an upright post-netting structure is characterized by comprising an integral supporting frame, a netting angle adjusting device, a netting moving device, a telescopic rod, a six-component force sensor, a connecting rod, a netting frame, a netting and an upright post; the integral supporting frame is of a frame type structure and plays a supporting role for the experimental device; one end of the netting angle adjusting device is fixedly connected with the netting moving device, the other end of the netting angle adjusting device is fixedly connected with the telescopic rod, and the included angle between the netting can be accurately adjusted through the netting angle adjusting device; the netting moving device is arranged on the integral supporting frame and can move on the integral supporting frame; the telescopic rod is fixedly connected with the six-component force sensor; the six-component force sensor is fixedly connected with the connecting rod; the connecting rod is fixedly connected with the netting frame; the netting is fixed in the netting frame; the two ends of the upright post are respectively fixedly connected with the connecting rod.
2. The experimental device for studying the hydrodynamic characteristics of the column-netting structure coupling according to claim 1, wherein the integral supporting frame is made of an aluminum alloy frame, the upper end of the integral supporting frame is longer in length direction, the cross beams extending from the two ends of the integral supporting frame can be transversely arranged on the water tank for hanging placement, and the bottom of the integral supporting frame is provided with a foot pad for sitting-bottom placement.
3. The experimental device for studying the hydrodynamic characteristics of a column-netting structure coupling according to claim 1, wherein said netting angle adjusting device comprises a set at the top and bottom of each netting frame and an angle scale for precisely adjusting the angle between two netting frames, said netting angle adjusting device further comprises a sleeve ring, said sleeve ring is engaged with said telescopic rod, said telescopic rod is rotatable in said sleeve ring, said sleeve ring is fixedly connected with said netting moving device by a thread capable of being loosened, thereby realizing a rotating function.
4. The test device for studying the hydrodynamic characteristics of the column-net structure coupling according to claim 1, wherein each of the net frames is provided with a set of net moving devices at the top and bottom thereof, the net moving devices comprise a sliding beam, a sliding plate and a sliding block, the sliding beam is fixedly connected with the integral supporting frame through a screw bolt, the sliding plate is fixed on the sliding beam through the sliding block and the screw bolt embedded in the sliding beam groove, and the movement of the net is realized by moving the sliding beam and the sliding plate.
5. The experimental device for studying the hydrodynamic characteristics of a column-netting structure coupling according to claim 1, wherein said telescopic rod is made of a plurality of hollow round rods with successively decreasing diameters, the nested hollow round rods can move relative to each other and are fixed by bolts, and said telescopic rod is provided with an indication arrow at a top end near one end of said netting angle adjusting device for displaying a current angle.
6. The test device for studying the hydrodynamic characteristics of a column-netting structure coupling according to claim 1, wherein the six-component force sensor is capable of measuring forces and bending moments in three directions under the current condition, the six-component force sensor is respectively assembled on the top and the bottom of the netting frame and the column, and two ends of the six-component force sensor are respectively fixedly connected with the telescopic rod and the connecting rod through bolts.
7. The experimental apparatus for studying the hydrodynamic characteristics of a column-netting structure coupling as claimed in claim 1, wherein said netting frame is made of stainless steel, the cross-section of the frame is circular to reduce the influence on the surrounding flow pattern, and the inner side of the frame is provided with small holes for fixing said netting.
8. The experimental device for studying the hydrodynamic characteristics of a column-net structure coupling according to claim 1, wherein the net is printed with a resin material 3 d.
9. The experimental apparatus for studying the hydrodynamic characteristics of a column-netting structure coupling according to claim 1, further comprising a flow guiding structure configured to wrap around the underwater portion of the integral support frame, wherein the flow guiding structure is streamlined to reduce the influence of the flow variation near the rod on the hydrodynamic characteristics of the netting-column structure.
10. The experimental device for studying the hydrodynamic characteristics of the column-netting structure coupling according to claim 1, wherein the column is a hollow unsealed structure and is fixedly connected with the connecting rod through screw holes at the upper end and the lower end.
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