CN112197937A - Integral linear hydrodynamic response experimental device for ocean wind power dynamic cable - Google Patents
Integral linear hydrodynamic response experimental device for ocean wind power dynamic cable Download PDFInfo
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Abstract
The invention belongs to the technical field of experiment tests of marine flexible pipe cables, and particularly relates to an integral linear hydrodynamic response experimental device of a marine wind power dynamic cable. According to the invention, the circular flow of water is realized through the square-shaped structure of the water tank and the flow making mechanism, and the in-place operation working condition of various marine dynamic cables can be simulated by controlling the flow making device, the wave making device and the six-degree-of-freedom mechanism, so that the integral linear hydrodynamic response characteristic of the pipe cable can be simulated experimentally under a certain working condition and the complex condition of combination of various working conditions, and the integral linear hydrodynamic response characteristic of the marine dynamic cables under the condition of stable water flow can be tested and simulated.
Description
Technical Field
The invention belongs to the technical field of experiment tests of marine flexible pipe cables, and particularly relates to an integral linear hydrodynamic response experimental device of a marine wind power dynamic cable.
Background
With the increase of energy demand and the pursuit of renewable energy, offshore wind power gets more and more attention by virtue of the characteristics of stable energy, large scale and the like. The submarine cable plays an indispensable role in offshore wind power generation, and in a power system, electric energy output by a fan is collected to an offshore substation through a cable laid on the seabed, and then is connected with an onshore substation through the submarine cable and is merged into a power grid. In shallow sea water areas, wind power equipment is generally fixed on the seabed, and the submarine cable with static design can be used in shallow water environments; the floating platform is needed to be used in a deep water area, relative motion exists among all units during normal operation, and the submarine cable needs to bear more severe marine environmental load, so that the submarine cable needs to be dynamically analyzed when laid in the deep water environment. The dynamic cable is generally a composite cable, has dual functions of transmitting power and optical signals, and is generally formed by winding a plurality of cables, and is spirally wound with armor steel wires on the outer side.
The dynamic cable is a dynamic section from the floating body to the ground contact point, the integral structure form of the in-place running state of the tube cable is called the line type of the tube cable, the line type of the tube cable determines the response of the tube cable under dynamic load, and in order to enable the tube cable to meet the strength requirement of the tube cable under the action of various static and dynamic loads, the line type needs to be designed according to various conditions such as water depth, the floating body, sea conditions, tube cable performance and the like. The motion and the maximum displacement offset of the floating body under the action of waves are important factors influencing the design of the dynamic cable type, and the influence of waves and ocean currents is also considered by combining the motion characteristics of the floating body, so that the ocean currents, the ocean waves and the motion of the floating body are important dynamic conditions to be considered in the design of the dynamic cable type.
The underwater equipment has high maintenance difficulty and long maintenance period, the stability of the underwater equipment is ensured as much as possible in the design stage, the structural model is complex in consideration of the multilayer spiral winding structural characteristics of the pipe cable and the linear geometric nonlinear characteristics, and the accuracy of the underwater equipment is difficult to ensure by results obtained by a theoretical and numerical simulation method; the prototype experiment has long period, high cost and great experiment difficulty. Therefore, a scaling model experiment device capable of simulating ocean current, sea wave and floating body motion simultaneously is needed, the overall linear hydrodynamic response characteristics of the dynamic cable in-place operation are tested through an experiment method, the reasonability of linear design is ensured, the stability of in-place operation of the pipe cable is improved, and an optimized design scheme is provided for the linear design. At present, in the domestic scaling model experiment device for simulating the motion of the dynamic cable under the real sea condition, a device capable of simulating the motion of ocean current, ocean wave and floating body at the same time does not exist, so that a scaling model experiment device capable of completely reproducing the real in-place operation working condition of the pipe cable is urgently needed, the hydrodynamic response characteristic of the integral line type of the in-place operation of the marine wind power dynamic cable is researched, and an experiment method support is further provided for the line type design of the dynamic cable in China.
Disclosure of Invention
The invention aims to provide an integral linear hydrodynamic response experimental device for an ocean wind power dynamic cable.
The purpose of the invention is realized by the following technical scheme: the device comprises an experimental water tank, a six-degree-of-freedom motion platform and an experimental cable; a central platform is arranged in the center of the interior of the experimental water tank, chamfering devices are arranged at the corners of the periphery of the experimental water tank, and the overall horizontal cross section of the experimental water tank is in a shape of Chinese character 'hui'; the experimental water tank is internally provided with a closed loop consisting of two linear section areas and two semicircular areas, the front end and the rear end of one linear section area are provided with pore plates, the other linear section area is provided with a flow making system, and an area formed by the two pore plates, a central platform and the wall surface of the experimental water tank is set as an experimental area; the experimental region is internally provided with a wave making system, slide rails are arranged above the experimental region, on the upper ends of the central platform and the wall surface of the experimental water tank, and a screw rod is arranged above the slide rails; the six-degree-of-freedom motion platform comprises a six-degree-of-freedom actuator, a top mounting plate and a bottom mounting plate; the six-degree-of-freedom actuator is arranged at the lower end of the top mounting plate through a flexible hinge; the bottom mounting plate is mounted at the lower end of the six-degree-of-freedom actuator through a flexible hinge; two sides of the top mounting plate are respectively mounted on slide rails at the upper end of the experimental area through slide blocks, and the slide blocks are connected with the screw rods through screw rod nuts; the screw rod is connected with the output end of the linear motor through a coupler; experiment cable upper end install the lower extreme at the bottom mounting panel through preventing the curvedness ware, according to the experiment needs at experiment cable lower extreme installation floating block or positioner, make the experiment cable be in specific line type.
The present invention may further comprise:
the flow making system is composed of a row of flow making devices which are longitudinally arranged in parallel in the straight line section area at the opposite side of the experiment area; the flow making device comprises a rotating shaft, one end of the rotating shaft penetrates through the outer wall surface of the experimental water tank and is connected with the output end of the motor through a coupler, and the other end of the rotating shaft is provided with a propeller.
The wave making system comprises a wave making plate; the wave making plate is arranged in front of a pore plate on one side of the experimental area, a guide rail is longitudinally arranged at the upper part of the wave making plate, and a row of pneumatic push rods are arranged at the upper part of the pore plate; the pneumatic push rod is connected with the wave making plate sliding block in the guide rail through the connecting piece, the connecting piece is in pin connection with the wave making plate sliding block through bolts and nuts, the wave making plate sliding block is in sliding connection with the wave making plate, the pneumatic push rod pushes the connecting piece to drive the wave making plate sliding block during working, the wave making plate sliding block slides along the guide rail on the upper portion of the wave making plate, transverse pushing of the pneumatic push rod is converted into fixed-axis rotation of the wave making plate, and therefore the wave making plate is pushed to swing in a reciprocating mode, and water flow is pushed to form; the wave making plate is hinged with the wall surface of the experimental water tank through a rotating shaft; the rotating shaft is positioned at one third of the height of the experimental water tank, so that only the upper layer in the experimental water tank has waves, and the lower layer is stable water flow.
The invention has the beneficial effects that:
according to the invention, the circular flow of water is realized through the square-shaped structure of the water tank and the flow making mechanism, and the in-place operation working condition of various marine dynamic cables can be simulated by controlling the flow making device, the wave making device and the six-degree-of-freedom mechanism, so that the integral linear hydrodynamic response characteristic of the pipe cable can be simulated experimentally under a certain working condition and the complex condition of combination of various working conditions, and the integral linear hydrodynamic response characteristic of the marine dynamic cables under the condition of stable water flow can be tested and simulated.
Drawings
Fig. 1 is a schematic diagram of the overall spatial structure of the present invention.
Fig. 2 is a schematic space structure diagram of the flow-making system of the present invention.
Fig. 3 is a partially enlarged view of the wave generating system of the present invention.
Fig. 4 is a schematic space structure diagram of the wave making system of the present invention.
Fig. 5 is a schematic space structure diagram of the six-degree-of-freedom motion platform of the invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
The invention relates to an experimental test device for an ocean flexible pipe cable, in particular to an integral linear hydrodynamic response experimental device for an ocean wind power dynamic cable.
The utility model provides an ocean wind power dynamic cable whole line type hydrodynamic response experimental apparatus, includes: the loading device is used for driving the experiment cable to move in six-degree-of-freedom multi-direction and to linearly reciprocate in a large range;
the basin, the horizontal plane cross-section of basin is the font of returning, including two straight line section areas and two semicircle annular regions, forms a closed return ring, and water can realize that rivers make rivers control more steadily more easily at the transition of corner department through water tank chamfer device all around in the horizontal plane circulation flow. The area of the straight line section on the front surface of the water tank separated by the two pore plates is called an experimental area;
the flow making mechanism is used for driving water flow in the Chinese character 'hui' water tank to flow anticlockwise or clockwise;
the wave making mechanism is used for driving water flow in the experimental area to make waves so as to simulate sea waves in the sea;
experiment cable, loading device is connected to cable one end, and the other end stretches into in the transparent basin and is equipped with the pouring weight.
The loading device comprises a six-degree-of-freedom motion platform, the six-degree-of-freedom motion platform consists of a six-degree-of-freedom actuator, a top plate and a bottom plate, the six-degree-of-freedom actuator is positioned between the top plate and the bottom plate, and the six-degree-of-freedom actuator is connected with the top plate and the bottom plate through flexible hinges; the lower end of the bottom plate is provided with an anti-bending device connected with one end of the cable. The six-freedom-degree direction loading of the cable is realized by controlling the six-freedom-degree actuator to move.
The device also comprises a linear motor, a screw rod nut, a sliding block and a sliding rail; the output end of the linear motor is connected with the screw rod through a coupler, and the screw rod is provided with a screw rod nut fixedly connected with the six-freedom-degree motion platform top plate. A sliding block is fixedly arranged below the top plate and is in sliding connection with a linear sliding rail, and the sliding rail is positioned in a horizontal plane above the experimental area of the water tank and is respectively and fixedly arranged on the frames of the inner ring and the outer ring; the six-degree-of-freedom actuator and the bottom plate are driven to do linear motion through driving the top plate to do linear motion, and large-range linear reciprocating loading of the experimental cable is achieved.
The flow-making device is mainly located in a linear section area opposite to a water tank experiment area and comprises four groups of mechanisms which are longitudinally arranged in parallel, each group of mechanisms comprises a second motor and a propeller, the output end of the second motor is provided with a rotating shaft which is connected with the rotating shaft through a coupler, the rotating shaft penetrates through the outer ring wall of the water tank, and the propellers are fixedly connected with the rotating shaft through fastening nuts. By controlling the rotational speed or direction of rotation of the second motor, control of the flow rate or direction of the water can be achieved.
The wave making device is mainly located on one side of an experimental area of the water tank and comprises a wave making plate, a pneumatic push rod, a wave making plate sliding block and a connecting piece. The connecting piece and the artificial wave plate sliding block are in pin connection through bolts and nuts, the artificial wave plate sliding block is in sliding connection with the artificial wave plate, the pneumatic push rod is fixedly connected with the connecting piece, the pneumatic push rod pushes the connecting piece to drive the artificial wave plate sliding block during working, the artificial wave plate sliding block slides along a guide rail on the artificial wave plate, transverse pushing of the pneumatic push rod is changed into fixed-axis rotation of the artificial wave plate, and therefore the artificial wave plate is pushed to swing back and forth, and water flow is pushed to form artificial waves. The wave making plate is hinged with the wall of the water tank to enable the wave making plate to swing along the rotating shaft, the rotating shaft is located at the position of one third of the height of the water tank, the wave making plate can make the resistance received by the wave making plate smaller, only the upper layer of the water tank is provided with waves, and the lower layer of the water tank is stable water flow.
The outer surface of the transparent water tank is provided with scale marks, and the transparent water tank is made of an acrylic plate.
The experiment cable is of a spiral winding structure and is made of steel materials or polytetrafluoroethylene materials.
The four corners of the inner ring and the outer ring of the square-shaped water tank are chamfered, so that the backflow is smoother.
Be equipped with the orifice plate at the regional both ends of experiment, rivers stably flow into the experimental area through the left side orifice plate, and the wave flows out through the right side orifice plate again and becomes stable stream for the rivers are stable in the experimental area, avoid the turbulent interference experiment that annular region and screw department produced, and make whole basin only the experimental area have the wave, and this mechanism stable control rivers and wave make its both mutually not influence.
The method for carrying out the experiment test on the integral linear hydrodynamic response scaling model of the ocean wind power dynamic cable by using the experiment test device comprises the following steps:
obtaining the experimental testing device through assembly, wherein the cable is ensured to be in a vertical state, or a floating block or a positioning device is properly arranged on the cable so as to obtain a specific line type;
arranging and pasting tilt angle sensors on the surface of the cable at equal intervals, adhering strain gauge sensors on the cable component, and arranging tension and acceleration sensors at the connection part of the cable and the movable device;
after the sensors are installed, the experimental testing device is subjected to preliminary debugging: through loading device is right the cable carries out the loading of small amplitude to adjust and make a class mechanism motor and pneumatic push rod control valve regulation rivers and wave, the inclination and the curve of the strain change with time of analysis collection, after waiting to reach the test requirement, can develop the following experiment:
1. the six-freedom-degree actuator control cable realizes six-freedom-degree direction motion of rolling (rotating around an x axis), pitching (rotating around a y axis), yawing (rotating around a z axis), traversing (translating around the x axis), longitudinal moving (translating around the y axis) and heaving (translating around the z axis), and simulates the rolling, pitching, yawing, pitching and heaving motions of the floating body;
2. the first motor drives the screw rod to rotate, so that the cable and the six-degree-of-freedom platform move on the sliding rail transversely and greatly.
3. The water tank and the flow making mechanism can realize the circular flow of water, and the flow speed or the flow direction of the water can be adjusted by controlling the rotating speed or the rotating direction of a motor of the flow making device to simulate the flow of seawater with different flow speeds;
4. the wave making device pushes water flow to form waves, the pneumatic valve of the wave making mechanism is controlled, the pneumatic push rod pushes the wave making plate sliding block connected with the pneumatic push rod, the wave making plate sliding block moves on the wave making plate guide rail in a reciprocating mode, so that linear motion of the pneumatic push rod is changed into reciprocating rotation of the wave making plate, the wave making plate is located in one third of the whole water tank, resistance to the wave making device is smaller than that to the wave making device located at the bottom when the wave making device is driven, waves are made only on the surface of the water tank, and the lower portion of the water tank is still stable water. Different forms of artificial waves, including regular waves and random irregular waves with specific wave spectrums, can be produced by controlling the pneumatic push rods or changing the shape of the wave making plate. The artificial waves become stable water flow again by the wave after flowing out through the pore plate on the right side, so that the water tank only has the wave on the water surface of the test area and other areas all meet the experimental requirements of stable water flow, the cost is reduced, and the control difficulty of the water flow and the wave is reduced.
In each experiment process, one or more experiments can be carried out simultaneously, so that the marine environment can be simulated more truly, the experimental data are more accurate, the deformation form of the cable is recorded in the whole course of the period, the deformation data of the cable is read through the scale marks, meanwhile, the data of each sensor is collected, statistics and error analysis are carried out on the data, a reasonable test result is given, and the integral linear hydrodynamic response characteristic rule of the dynamic cable is analyzed.
Compared with the prior art, the invention has the beneficial effects that:
1. the water circulation flow can be realized through the square-shaped structure of returning the water tank and the flow making mechanism, the rotating speed or the steering of the motor of the flow making device can be controlled, the flow speed or the flow direction of water can be adjusted, the flow of seawater with different flow speeds can be simulated, and the integral linear hydrodynamic response characteristic of the ocean dynamic cable under the condition of stable water flow working condition can be tested and simulated.
2. The pneumatic valve of the wave making mechanism is controlled to convert the horizontal movement of the pneumatic push rod into the swing of the wave making plate, and the manual waves in different forms can be made by controlling the pneumatic push rod or changing the shape of the wave making plate, wherein the manual waves comprise regular waves with specific wave spectrums and random irregular waves, and the overall linear hydrodynamic response characteristics of the ocean dynamic cable under various wave working conditions can be tested and simulated. The water flow flows into a test area from the pore plate on the left side and is made into waves through the wave making mechanism, the turbulent flow flows out through the pore plate on the right side after passing through the test area and then is changed into stable water flow again, the whole water tank only has waves in the test area, and the wave making plate is located at one third of the height of the water tank, so that the difficulty of making the waves is greatly reduced.
3. The six-degree-of-freedom mechanism can realize the six-degree-of-freedom directional motion of rolling (rotating around an x axis), pitching (rotating around a y axis), yawing (rotating around a z axis), transverse moving (translating around the x axis), longitudinal moving (translating around the y axis) and heaving (translating around the z axis), simulate the rolling, pitching, yawing, pitching and heaving motions of the floating body, completely simulate the motion of the floating body in actual production, and can test the integral linear hydrodynamic response characteristics of the ocean dynamic cable under the condition of simulating the motion of the floating body.
4. The current-making device, the wave-making device and the six-degree-of-freedom mechanism are respectively controlled, so that the in-place operation working condition of various ocean dynamic cables can be simulated, the integral linear hydrodynamic response characteristic of the pipe cable can be simulated under a certain working condition or a complex condition of combination of various working conditions. Compared with a device which only simulates one working condition, the invention can simulate more complex working conditions.
5. By reasonably adjusting and installing the floating block and the positioning device at different positions of the cable, hydrodynamic responses of various line types can be tested and simulated; by adjusting the number and the positions of the floating blocks and the positioning devices, the influence of different arrangement modes of the pipe cable accessories on the overall linear hydrodynamic response of the pipe cable can be tested and simulated; the influence of the hydrodynamic response on the integral linear hydrodynamic response of the cable can be tested by adjusting the hydrodynamic response parameters of the cable accessories according to the novel cable accessories.
6. By means of the similarity ratio principle, the dynamic cable overall linear hydrodynamic response is simulated by means of small-scale indoor model experiments, so that the dynamic response mechanism of a prototype structure is disclosed, and the problems of difficult operation, time consumption and consumption of the prototype experiments are solved.
7. The experimental test method simulates the marine dynamic cable structure (such as steel materials or polytetrafluoroethylene) through a spiral winding structure processed by a certain material, and simulates and realizes models of dynamic cables with different bending rigidities. And replace cable weight with the balancing weight, use the geometric proportion weight to realize adjustable cable weight.
8. The dynamic cable scaling model spiral winding structure is connected with the movable device, is provided with a certain annular binding structure (annularly bound outside the cable and used for increasing the extrusion friction effect) and is used for applying extrusion force between internal components, so that simulation of different friction forces between the components is realized.
9. The experimental test device is novel and practical, each group of motors and pneumatic devices are mutually independent, the application of respective loads can be effectively controlled, and meanwhile, the random change of the loading sequence can be realized according to engineering and design requirements. The motors and the pneumatic valves can be accurately controlled and operated through self-programming, and the preset ship body and seawater movement can be simulated repeatedly. Meanwhile, the motion output data can be recorded, and errors can be conveniently adjusted to ensure the motion accuracy.
10. The water tank of the experimental testing device adopts the transparent acrylic plate, and the outer surface of the acrylic plate in the front experimental area is provided with scale marks, so that the deformation condition of the cable can be visually checked through the scale marks.
11. Can realize the big displacement motion of structure, linear guide is roughly the same with experimental area length, and mobile device can be at the experimental area top reciprocating motion on a large scale of basin.
12. The transparent water tank can be filled with water or other liquid, and can simulate the motion state under various liquid states.
13. The cable is big in space around, conveniently adds corresponding sensor and measures the record to the relevant physical quantity of test piece.
Based on the reasons, the device and the method can be widely popularized in the fields of marine dynamic cable experiment testing devices and methods and the like.
Example 1:
as shown in fig. 1 to 5, an experiment testing device for overall linear hydrodynamic response scaling model of ocean wind power dynamic cable includes: the loading device is used for driving the cable 1 to move in the direction of six degrees of freedom and to do reciprocating linear motion, the cable 1 with one end connected with the loading device is arranged on the loading device, and the other end of the cable 1 extends into the square-shaped water tank 2 and is provided with a weight 3; the loading device comprises a six-degree-of-freedom actuator 401, a top plate 402 and a bottom plate 403, wherein the top plate 402 is positioned above the six-degree-of-freedom actuator 401, the bottom plate 403 is positioned below the six-degree-of-freedom actuator 401, and the six-degree-of-freedom actuator 401 is connected with the top plate 402 and the bottom plate 403 through flexible hinges 404;
the loading device comprises a sliding block 5 connected with the six-degree-of-freedom platform mechanism and a lead screw nut 7 which can be connected with a lead screw 6, the six-degree-of-freedom platform 4 is connected with the sliding block 5 through a stud bolt, and the six-degree-of-freedom platform is connected with the detachable lead screw nut 7; the sliding block 5 is connected with the sliding rail 8 in a sliding fit manner, so that the movable device slides on the sliding rail to realize transverse movement; the screw nut 7 is connected with the screw 6 in a matching way, the screw 6 is connected with the coupling 9, and the coupling 9 is connected with the first motor 10; the first motor 10 drives the screw rod 6 to rotate to push the six-degree-of-freedom platform mechanism 4 to move horizontally; the screw 6 is matched with a screw support 11, the screw support 11 is fixed on a support block 12 through a screw, and the support block is welded on a plate 13; the plate 13 is fixed on the square-shaped water tank 2;
the wave making device is used for driving water flow in an experimental area to make waves to simulate sea waves in the sea and comprises a wave making plate 14, a wave making plate sliding block 15, a pneumatic push rod connecting piece 16 and a pneumatic push rod 17; the pneumatic push rod 17 is connected with the pneumatic push rod connecting piece 16, the connecting piece 16 is connected with the wave making plate sliding block 15 through a pin, so that the wave making plate sliding block 15 can rotate relative to the connecting piece 16, and the wave making plate sliding block 15 is connected with the wave making plate 14 in a sliding mode; the pneumatic push rod 17 pushes the slide block of the wave making plate to slide on the wave making plate 14 so as to push the wave making plate 14 to swing back and forth to push water flow to form artificial waves; the three pneumatic push rods 17 are fixed on angle steel 18, and the angle steel 18 is fixed on the square-shaped water tank, so that the wave making device is fixed;
the flow making device is used for driving water flow in the square-shaped water tank 2 to flow reversely or clockwise, and comprises a propeller 19, a fastening nut 20, a shaft 21, a coupling 22 and a second motor 23; the propeller 19 is arranged on a shaft 21 and is screwed by a fastening nut 20, the shaft 21 is connected with a coupler 22, the coupler 22 is connected with a second motor 23, the second motor 23 rotates the driving shaft 21 to rotate and drives the propeller 19 to rotate, and four groups of the flow making devices are longitudinally arranged to make water flow in the reversed-square water tank 2; two pore plates 24 are respectively installed at the positions of the plates 13, an experimental area is arranged between the two pore plates, waves exist in the whole wave-shaped water tank only in the experimental area, water flow enters through the pore plate at the left side, wave making is carried out through the wave making device, the waves are changed into water flow again through the pore plate at the right side, and the water flow is formed by backflow in the wave-shaped water tank 2; four chamfering devices 26 are respectively arranged in the four corners of the frame 25, so that the backflow is smoother; the four sides and the bottom of the water tank are made of acrylic plates. Two support plates 27 are welded at the bottom of the frame 25, and the support plates 27 are connected with the frame 28 through bolts to be fixed on the square-shaped water tank 2 and the frame 28; six wheels 29 are mounted on the bottom of the frame 28 and are bolted together.
A test method for carrying out an experiment of the integral linear hydrodynamic response scaling model of the ocean wind power dynamic cable by using the experiment test device comprises the following steps:
the experimental testing device is obtained through assembly, the first motor 10 and the second motor 23 are connected with a power supply, the control switches of the motors are closed, the corresponding motors are correspondingly opened according to the motion state required, and the motion control is carried out on the motors through a self-programming sequence; one end of a cable to be tested is fixed on the six-degree-of-freedom platform 4, and the other end of the cable is fixed on the heavy block 3, so that the cable is kept in a vertical state, or a floating block or a positioning device is properly arranged on the cable, and a specific line type is obtained; the pneumatic push rod 17 is connected with the air cylinder, the control valve switch is closed, the corresponding control valve is correspondingly opened according to the motion state required, and the motion control is carried out by listening to the self-programming sequence;
according to experimental requirements, inclination angle sensors are arranged and adhered to the surface of the cable 1 at equal intervals, strain gauge sensors are adhered to the component members of the cable 1, tension and acceleration sensors are arranged at the connecting part of the cable 1 and the movable device, meanwhile, one ends of flat cables connected to various sensors are fixed to the cable 1 through adhesive tapes, fluctuation of test data caused by shaking of the flat cables in the test process is prevented, and the other ends of the flat cables are connected to an acquisition system, so that real-time transmission of the strain data is realized;
after the sensors are installed, the experimental testing device is subjected to preliminary debugging: the cable 1 is loaded in a small amplitude through the loading device, the acquired curve of the change of the inclination angle along with time is analyzed, and after the test requirement is met, an experiment can be developed;
the first motor 10 is controlled to drive the screw 6 to rotate, the screw nut 7 is driven to drive the loading device to move horizontally, and the reciprocating motion is controlled by controlling the rotation of the first motor, so that only the reciprocating motion of the loading device is realized;
controlling an electromagnetic actuator of the six-degree-of-freedom platform, bending the flexible hinge to further control the degree of freedom of the platform, and realizing multi-directional degree of freedom control of the cable;
controlling a second motor 23, driving a shaft 21 to further control a propeller 19 to rotate, driving water flow in the square-shaped water tank 2 to flow, controlling the steering direction of the second motor 23 to control the flow direction of the water in the water tank to be clockwise or anticlockwise, controlling the rotating speed of the second motor 23 to control the flow speed of the water in the water tank, and realizing the control of the water flow in the square-shaped water tank 2;
the control valve of the pneumatic push rod 17 of the wave making device is controlled to control the movement of the pneumatic push rod 17, so that the connecting piece 16 is pushed, the wave making plate sliding block 15 and the connecting piece 16 rotate relatively, the wave making plate sliding block 15 slides on a sliding rail of the wave making plate 14, the wave making plate 14 swings back and forth, the experimental requirement that horizontal pushing is converted into relative swinging is realized, water flow is pushed to form sea waves of artificial waves simulating ocean, the requirement of simulating the sea waves is realized, and the water flow is converted into stable water flow again through a hole plate on the right side of a test area;
in each experimental process, the deformation state of the cable 1 is recorded through a whole-course video, the loop-shaped water tank 2 uses an acrylic plate, the outer surface of the loop-shaped water tank is provided with scale marks, the deformation data of the cable 1 can be read, meanwhile, the data of each sensor is collected, statistics and error analysis are carried out on the data, a reasonable test result is given, and the influence rule of the bending hysteresis effect of the cable section on the whole dynamic response is analyzed. The above experiments can be repeated several times to reduce errors.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. The utility model provides an ocean wind power developments cable whole line type hydrodynamic response experimental apparatus which characterized in that: the device comprises an experimental water tank, a six-degree-of-freedom motion platform and an experimental cable; a central platform is arranged in the center of the interior of the experimental water tank, chamfering devices are arranged at the corners of the periphery of the experimental water tank, and the overall horizontal cross section of the experimental water tank is in a shape of Chinese character 'hui'; the experimental water tank is internally provided with a closed loop consisting of two linear section areas and two semicircular areas, the front end and the rear end of one linear section area are provided with pore plates, the other linear section area is provided with a flow making system, and an area formed by the two pore plates, a central platform and the wall surface of the experimental water tank is set as an experimental area; the experimental region is internally provided with a wave making system, slide rails are arranged above the experimental region, on the upper ends of the central platform and the wall surface of the experimental water tank, and a screw rod is arranged above the slide rails; the six-degree-of-freedom motion platform comprises a six-degree-of-freedom actuator, a top mounting plate and a bottom mounting plate; the six-degree-of-freedom actuator is arranged at the lower end of the top mounting plate through a flexible hinge; the bottom mounting plate is mounted at the lower end of the six-degree-of-freedom actuator through a flexible hinge; two sides of the top mounting plate are respectively mounted on slide rails at the upper end of the experimental area through slide blocks, and the slide blocks are connected with the screw rods through screw rod nuts; the screw rod is connected with the output end of the linear motor through a coupler; experiment cable upper end install the lower extreme at the bottom mounting panel through preventing the curvedness ware, according to the experiment needs at experiment cable lower extreme installation floating block or positioner, make the experiment cable be in specific line type.
2. The marine wind power dynamic cable integral linear hydrodynamic response experimental device according to claim 1, characterized in that: the flow making system is composed of a row of flow making devices which are longitudinally arranged in parallel in the straight line section area at the opposite side of the experiment area; the flow making device comprises a rotating shaft, one end of the rotating shaft penetrates through the outer wall surface of the experimental water tank and is connected with the output end of the motor through a coupler, and the other end of the rotating shaft is provided with a propeller.
3. The marine wind power dynamic cable integral linear hydrodynamic response experimental device according to claim 1 or 2, characterized in that: the wave making system comprises a wave making plate; the wave making plate is arranged in front of a pore plate on one side of the experimental area, a guide rail is longitudinally arranged at the upper part of the wave making plate, and a row of pneumatic push rods are arranged at the upper part of the pore plate; the pneumatic push rod is connected with the wave making plate sliding block in the guide rail through the connecting piece, the connecting piece is in pin connection with the wave making plate sliding block through bolts and nuts, the wave making plate sliding block is in sliding connection with the wave making plate, the pneumatic push rod pushes the connecting piece to drive the wave making plate sliding block during working, the wave making plate sliding block slides along the guide rail on the upper portion of the wave making plate, transverse pushing of the pneumatic push rod is converted into fixed-axis rotation of the wave making plate, and therefore the wave making plate is pushed to swing in a reciprocating mode, and water flow is pushed to form; the wave making plate is hinged with the wall surface of the experimental water tank through a rotating shaft; the rotating shaft is positioned at one third of the height of the experimental water tank, so that only the upper layer in the experimental water tank has waves, and the lower layer is stable water flow.
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