CN112197937B - 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 marine flexible pipe cable experimental tests, and particularly relates to an integral linear hydrodynamic response experimental device for a marine wind power dynamic cable. The invention realizes the circulating flow of water through the back-shaped structure of the water tank and the flow-making mechanism, and can simulate the in-place operation working condition of various ocean dynamic cables by controlling the flow-making device, the wave-making device and the six-degree-of-freedom mechanism, not only can simulate a certain working condition by experiment, but also can simulate the integral linear hydrodynamic response characteristic of the pipe cable under the complex condition of various working condition combinations by experiment, and can test the integral linear hydrodynamic response characteristic of the ocean dynamic cable under the steady water flow working condition.
Description
Technical Field
The invention belongs to the technical field of marine flexible pipe cable experimental tests, and particularly relates to an integral linear hydrodynamic response experimental device for a marine wind power dynamic cable.
Background
With the increase of energy demand and the pursuit of renewable energy sources, offshore wind power is getting more and more attention by virtue of the characteristics of stable energy sources, 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 transformer station through a cable laid on the seabed, and then is connected with the onshore transformer station through the submarine cable and is integrated into a power grid. In a shallow sea area, wind power equipment is generally fixed on the sea bottom, and can be used in a shallow water environment through a submarine cable with static design; in deep water, a floating platform is needed, and relative motion exists among units in normal operation, so that submarine cables need to bear more serious marine environmental load, and dynamic analysis is needed when the submarine cables are laid in the deep water environment. The dynamic cable is generally a composite cable and has the dual functions of transmitting electric power and optical signals, and the structure is generally formed by winding a plurality of cables, and the outer side of the dynamic cable is spirally wound with armoured steel wires.
The dynamic cable is a dynamic section from the floating body to the touchdown point, the integral structure form of the pipe cable in the in-place running state is called as the line type of the pipe cable, the line type of the pipe cable determines the response of the pipe cable under dynamic load, and in order to enable the pipe cable to meet the strength requirement of the pipe cable under various static and dynamic loads, the line type is required to be designed in a targeted manner according to various conditions such as water depth, floating body, sea condition, pipe 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 of the pipe, and meanwhile, the influence of waves and ocean currents is considered by combining the motion characteristics of the floating body, so that ocean currents, 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 maintenance difficulty of the underwater equipment is high, the maintenance period is long, the stability of the underwater equipment is ensured as much as possible in the design stage, the multi-layer spiral winding structural characteristics of the pipe cable and the linear geometric nonlinear characteristics are considered, the structural model is complex, and the accuracy of the result obtained by a theoretical and numerical simulation method is difficult to ensure; and the prototype experiment has long period, high cost and great experiment difficulty. Therefore, a scaling model experimental device capable of simultaneously simulating the motions of ocean currents, ocean waves and floating bodies is needed, the integral linear hydrodynamic response characteristics of the dynamic cable in-situ operation are tested through an experimental method, the reasonability of linear design is ensured, the in-situ operation stability of the pipe cable is improved, and an optimal design scheme is provided for the linear design. At present, a device capable of simulating the motions of sea currents, sea waves and floating bodies simultaneously does not exist in a domestic scaling model experimental device similar to the motion of a dynamic cable under the condition of simulating real sea conditions, and a scaling model experimental device capable of completely reproducing the real on-site operation working condition of a pipe cable is needed to study hydrodynamic response characteristics of the on-site operation integral line type of a marine wind power dynamic cable, so that experimental method support is 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 aim of the invention is realized by the following technical scheme: the device comprises an experiment water tank, a six-degree-of-freedom motion platform and an experiment cable; the center of the inside of the experiment water tank is provided with a center platform, the corners of the periphery of the experiment water tank are provided with chamfering devices, and the whole horizontal cross section of the experiment water tank is in a shape like a Chinese character 'Hui'; the experimental water tank is internally provided with a closed loop consisting of two straight line section areas and two semicircular annular areas, wherein the front end and the rear end of one straight line section area are provided with pore plates, the other straight line section area is provided with a flow generating system, and an area surrounded by the two pore plates, a central platform and the wall surface of the experimental water tank is used as an experimental area; the experimental area is internally provided with a wave making system, a slide rail is arranged above the experimental area, the upper ends of the central platform and the wall surface of the experimental water tank are provided with a screw rod above the slide rail; 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 arranged at the lower end of the six-degree-of-freedom actuator through a flexible hinge; the two sides of the top mounting plate are respectively arranged on a sliding rail at the upper end of the experimental area through sliding blocks, and the sliding blocks are connected with the screw rod through screw rod nuts; the screw rod is connected with the output end of the linear motor through a coupler; the upper end of the experimental cable is arranged at the lower end of the bottom mounting plate through the bending prevention device, and a floating block or a positioning device is arranged at the lower end of the experimental cable according to experimental requirements, so that the experimental cable is in a specific line type.
The invention may further include:
the flow making system consists of a row of flow making devices longitudinally and parallelly arranged in the opposite side straight line section area of the experimental area; the flow making device comprises a rotating shaft, one end of the rotating shaft penetrates through the outer side wall surface of the experiment water tank and is connected with the output end of the motor through a coupling, and a propeller is arranged at the other end of the rotating shaft.
The wave making system comprises a wave making plate; the wave making plate is arranged in front of the orifice plate at one side of the experimental area, a guide rail is longitudinally arranged at the upper part of the wave making plate, and an exhaust movable push rod is arranged at the upper part of the orifice 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 and the wave making plate sliding block are connected through bolts and nuts to form pins, the wave making plate sliding block is connected with the wave making plate in a sliding mode, the pneumatic push rod pushes the connecting piece to drive the wave making plate sliding block to slide along the guide rail at the upper part of the wave making plate when in operation, the transverse pushing of the pneumatic push rod is converted into fixed shaft rotation of the wave making plate, and accordingly the wave making plate is pushed to swing in a reciprocating mode, and water flow is pushed to form artificial waves; 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 of the experimental water tank has waves, and the lower layer is stable water flow.
The invention has the beneficial effects that:
the invention realizes the circulating flow of water through the back-shaped structure of the water tank and the flow-making mechanism, and can simulate the in-place operation working condition of various ocean dynamic cables by controlling the flow-making device, the wave-making device and the six-degree-of-freedom mechanism, not only can simulate a certain working condition by experiment, but also can simulate the integral linear hydrodynamic response characteristic of the pipe cable under the complex condition of various working condition combinations by experiment, and can test the integral linear hydrodynamic response characteristic of the ocean dynamic cable under the steady water flow working condition.
Drawings
Fig. 1 is a schematic view of the general spatial structure of the present invention.
Fig. 2 is a schematic diagram of the spatial structure of the current generating system in the present invention.
Fig. 3 is an enlarged view of a part of the wave making system according to the invention.
Fig. 4 is a schematic view of the spatial structure of the wave making system according to the present invention.
Fig. 5 is a schematic diagram of a spatial structure of a six-degree-of-freedom motion platform according to the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
The invention relates to an experimental testing device for an ocean flexible pipe cable, in particular to an experimental device for an ocean wind power dynamic cable integral line type hydrodynamic response.
An experimental device for marine wind power dynamic cable integral line type hydrodynamic response, comprising: the loading device is used for driving the experimental cable to move in six-degree-of-freedom multi-direction and move in a linear reciprocating manner in a large range;
the horizontal plane cross section of basin is the back font, including two straightway regions and two semicircle annular regions, forms a closed ring, and water can circulate the water through water tank peripheral chamfer device in the horizontal plane and realize the transition of rivers in the corner and make rivers more steady easier control. The area of the front straight line section of the water tank separated by the two pore plates is called an experimental area;
the flow generating mechanism is used for driving water flow in the character-returning water tank to flow anticlockwise or clockwise;
the wave generating mechanism is used for driving water flow in the experimental area to generate waves so as to simulate sea waves in the ocean;
the 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, wherein 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 a bending prevention device connected with one end of the cable. And the six-degree-of-freedom directional loading of the cable is realized by controlling the motion of the six-degree-of-freedom actuator.
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 a screw rod through a coupler, and a screw rod nut fixedly connected with the top plate of the six-degree-of-freedom motion platform is arranged on the screw rod. A sliding block is fixedly arranged below the top plate, the sliding block is in sliding connection with a linear sliding rail, the sliding rail is positioned in a horizontal plane above the water tank experiment area, and the sliding rail is respectively and fixedly arranged on the frames of the inner ring and the outer ring; the top plate is driven to linearly move, the six-degree-of-freedom actuator and the bottom plate are driven to linearly move, and large-range linear reciprocating loading of the experimental cable is achieved.
The flow making device is mainly located in a straight line section area on the opposite side of the water tank experimental 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 second motor through a coupling, 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 the turning direction of the second motor, control of the flow speed or the flow 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 wave making plate sliding block are connected through a bolt and a nut to form a pin, the wave making plate sliding block is connected with the wave making plate in a sliding way, the pneumatic push rod is fixedly connected with the connecting piece, the pneumatic push rod pushes the connecting piece to drive the wave making plate sliding block to slide along a guide rail on the wave making plate during operation, and the transverse pushing of the pneumatic push rod is converted into fixed shaft rotation of the wave making plate, so that the wave making plate is pushed to swing in a reciprocating way, 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 positioned at one third of the height of the water tank, the wave making plate can make waves to enable the resistance to be smaller, only the upper layer of the water tank has waves, and the lower layer 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 experimental cable is of a spiral winding structure, and is made of steel materials or polytetrafluoroethylene materials.
Chamfering is carried out at four corners of the inner ring and the outer ring of the circular water tank, so that the backflow is smoother.
The experimental area is provided with the pore plates at two ends, water flows into the experimental area through the left pore plate stably, waves flow out through the right pore plate and become stable flow, so that the water flow in the experimental area is stable, turbulent flow interference experiments generated by the annular area and the propeller are avoided, the whole water tank only has waves in the experimental area, and the mechanism stably controls the water flow and the waves to ensure that the water flow and the waves are not influenced by each other.
The experimental testing method for the marine wind power dynamic cable integral line type hydrodynamic response scaling model by using the experimental testing device comprises the following steps:
the experimental testing device is obtained 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;
the inclination angle sensors are equidistantly arranged and stuck on the surface of the cable, the strain gauge sensors are stuck on the cable component, and the tension and acceleration sensors are arranged at the joint of the cable and the movable device;
after the sensors are installed, the experimental testing device is subjected to preliminary debugging: the loading device is used for loading the cable in a small amplitude, adjusting the motor of the flow making mechanism and the pneumatic push rod control valve to adjust water flow and waves, analyzing the collected inclination angle and the curve of the strain changing along with time, and after the testing requirement is met, carrying out the following experiment:
1. the six-degree-of-freedom actuator control cable realizes 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), traversing (translating around the x axis), longitudinal shifting (translating around the y axis) and heaving (translating around the z axis) and simulates rolling, pitching, swaying 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 transversely and greatly on the sliding rail.
3. The water tank and the flow-making mechanism can realize the circulation flow of water, and the flow speed or the flow direction of the water can be regulated by controlling the rotation speed or the rotation direction of the motor of the flow-making device so as 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 valve, and the wave making plate sliding block moves back and forth on the wave making plate guide rail, so that the linear motion of the pneumatic push rod is changed into the back and forth rotation of the wave making plate, the wave making plate is positioned at one third of the whole water tank, the resistance of the wave making plate is smaller than that of the wave making device positioned at the bottom when the wave making device is driven, waves are made on the surface of the water tank, and the lower part of the water tank is still stable water flow. Different forms of artificial waves can be manufactured by controlling the pneumatic push rods or changing the shape of the wave making plate, including regular waves with a specific wave spectrum and random irregular waves. The artificial waves flow out through the pore plate on the right side and then are changed into stable water flow by the waves again, so that the experimental requirement that the water tank only has waves on the water surface of the test area and the other areas are stable water flow is realized, the cost is reduced, and the control difficulty of the water flow and the waves is reduced.
In the experimental process, one or more experiments can be carried out simultaneously, so that the marine environment can be simulated more truly, experimental data are more accurate, the deformation form of the cable is recorded in a whole-course video recording mode, the deformation data of the cable are read through the scale marks, meanwhile, data of each sensor are collected, statistics and error analysis are carried out on the data, reasonable test results are 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 circulating flow of water can be realized through the back-shaped structure of the water tank and the flow-making mechanism, the flow speed or the flow direction of water can be regulated by controlling the rotating speed or the rotating direction of the motor of the flow-making device, the sea water flow at different flow speeds can be simulated, and the integral linear hydrodynamic response characteristics of the ocean dynamic cable under the condition of simulating stable water flow working conditions can be tested.
2. The horizontal movement of the pneumatic push rod is converted into the swing of the wave making plate by controlling the pneumatic valve of the wave making mechanism, and artificial waves in different forms can be manufactured by controlling the pneumatic push rod or changing the shape of the wave making plate, including regular waves with specific wave spectrums and random irregular waves, so that the integral linear hydrodynamic response characteristics of the ocean dynamic cable under the condition of simulating various wave working conditions can be tested. The water flow flows into the test area from the left hole plate and waves are produced by the wave producing mechanism, after passing through the test area, turbulent flow flows out through the right hole plate and then becomes stable water flow again, so that the whole water tank only has waves in the test area, and the wave producing plate is positioned at one third of the height of the water tank, thereby greatly reducing the difficulty of producing waves.
3. The six-degree-of-freedom mechanism can realize six-degree-of-freedom directional movements of rolling (rotating around an x axis), pitching (rotating around a y axis), yawing (rotating around a z axis), sideslip (translating around the x axis), longitudinal shifting (translating around the y axis) and heaving (translating around the z axis), simulate rolling, pitching, bowing, swaying and heaving movements of the floating body, completely simulate the movement of the floating body in actual production, and can test the integral linear hydrodynamic response characteristics of the marine dynamic cable under the working condition of the simulated movement of the floating body.
4. Through controlling the flow making device, the wave making device and the six-degree-of-freedom mechanism respectively, the on-site operation working condition of various ocean dynamic cables can be simulated, not only can a certain working condition be simulated experimentally, but also the integral linear hydrodynamic response characteristics of the pipe cable can be simulated experimentally under the complex condition of various working condition combinations. Compared with a device for simulating only one working condition, the device can simulate more complex working conditions.
5. The hydrodynamic response of various lines can be tested and simulated by reasonably adjusting and installing the floating blocks and the positioning devices at different positions of the cable; the influence of different pipe cable accessory arrangement modes on the overall linear hydrodynamic response of the pipe cable can be tested and simulated by adjusting the number and the positions of the floating blocks and the positioning devices; the influence of the hydrodynamic response parameters of the pipe cable accessory on the overall linear hydrodynamic response of the pipe cable can be tested for the novel pipe cable accessory by adjusting the hydrodynamic response parameters of the pipe cable accessory.
6. By means of the similarity ratio principle, the whole linear hydrodynamic response of the dynamic cable is simulated by means of the small-scale indoor model experiment, so that the dynamic response mechanism of the prototype structure is revealed, and the difficulties of difficult operation and time consumption of the prototype experiment are avoided.
7. According to the experimental test method, the spiral winding structure processed by a certain material is used for simulating the ocean dynamic cable structure (such as steel materials or polytetrafluoroethylene and the like), and the model of the dynamic cable with different bending stiffness is simulated. And replace cable weight with the balancing weight, use the equal proportion weight to realize adjustable cable weight.
8. The dynamic cable shrinkage model spiral winding structure is connected with the movable device, and is provided with a certain annular binding structure (annular binding is arranged outside the cable and used for increasing the extrusion friction effect) for applying extrusion force between internal components, so that simulation of different friction forces between the components is realized.
9. The experimental testing device is novel and practical, and each group of motors and the pneumatic device are mutually independent, so that 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, so that the motion of the ship body and the sea water which are preset in a simulation mode is reproduced. Meanwhile, the motion output data can be recorded, so that errors can be conveniently adjusted, and the motion accuracy is ensured.
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 the scale marks, so that the deformation condition of the cable can be visually checked through the scale marks.
11. The large displacement movement of the structure can be realized, the length of the linear guide rail is approximately the same as that of the experimental area, and the movable device can reciprocate in a large range above the experimental area of the water tank.
12. The transparent water tank can be filled with water or other liquid, and can simulate the motion state under various different liquid states.
13. The space around the cable is larger, so that the corresponding sensor can be conveniently added to record the relative physical quantity of the test piece.
Based on the reasons, the invention can be widely popularized in the fields of ocean dynamic cable experimental test devices, ocean dynamic cable experimental test methods and the like.
Example 1:
as shown in fig. 1-5, an experimental testing device for a marine wind power dynamic cable integral linear hydrodynamic response scaling model comprises: the loading device is used for driving the cable 1 to move in the six-degree-of-freedom direction and reciprocate in a linear manner, a cable 1 with one end connected with the cable 1 is arranged on the loading device, and the other end of the cable 1 goes deep into the character-returning 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 a six-degree-of-freedom platform mechanism and a screw nut 7 capable of being connected with a screw 6, wherein the six-degree-of-freedom platform 4 is connected with the sliding block 5 through a stud, and the six-degree-of-freedom platform is connected with the detachable 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 matched and connected with the screw 6, the screw 6 is connected with the coupler 9, and the coupler 9 is connected with the first motor 10; the first motor 10 drives the screw rod 6 to rotate so as to push the six-degree-of-freedom platform mechanism 4 to horizontally move; the screw rod 6 is matched with a screw rod support 11, the screw rod 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 character-returning water tank 2;
the wave generating device is used for driving water flow in the experimental area to generate waves so as to simulate sea waves in the sea and comprises a wave generating plate 14, a wave generating 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 in sliding connection with the wave making plate 14; the pneumatic push rod 17 pushes the wave making plate sliding block to slide on the wave making plate 14 so as to push the wave making plate 14 to swing reciprocally to push water flow to form artificial waves; three pneumatic push rods 17 are fixed on angle steel 18, and the angle steel 18 is fixed on a return-word water tank, so that the wave making device is fixed;
the flow generating device is used for driving water flow in the character-returning 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 to drive the shaft 21 to rotate and drive the propeller 19 to rotate, and four groups of flow-making devices are longitudinally arranged to make water flow in the word-returning water tank 2; two pore plates 24 are respectively arranged at the plate 13, an experimental area is arranged between the two pore plates, only the experimental area of the whole character-return water tank is provided with waves, water flows enter through the left pore plate, waves are generated through the wave generating device, the waves are changed into water flows again through the right pore plate, and the water flows back in the character-return water tank 2 to form water flows; four chamfering devices 26 are respectively arranged in four corners of the frame 25, so that the backflow is smoother; acrylic plates are used for the materials of the four sides and the bottom surface of the water tank. 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 fix the character-returning water tank 2 and the frame 28; six wheels 29 are mounted at the bottom of the frame 28, and the two wheels are connected through bolts.
The experimental testing method for the marine wind power dynamic cable integral line type hydrodynamic response scaling model by using the experimental testing 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 motor control switches are closed, the corresponding motors are correspondingly opened according to the motion state required to be performed, and the motion control is performed on the motors through self-programming; 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 weight 3, so that the cable is ensured to be kept in a vertical state, or a floating block or a positioning device is properly arranged on the cable, so that a specific line type is obtained; the pneumatic push rod 17 is connected with the air cylinder, the switch of the control valve is closed, the corresponding control valve is correspondingly opened according to the motion state required to be carried out, and the motion control is carried out by hearing a self-programming program;
according to experimental requirements, the inclination angle sensors are equidistantly arranged and stuck on the surface of the cable 1, the strain gauge sensors are adhered to the component members of the cable 1, the tension and acceleration sensors are arranged at the joint of the cable 1 and the movable device, meanwhile, one ends of flat cables connected with various sensors are fixed on the cable 1 by using 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 with 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 loading device is used for loading the cable 1 in a small amplitude, analyzing the collected curve of the inclination angle changing along with time, and carrying out experiments after the test requirement is met;
the first motor 10 is controlled, the screw rod 6 is driven to rotate, the screw rod nut 7 is driven to drive the loading device to horizontally move, and the reciprocating motion is controlled by controlling the rotation of the first motor, so that the reciprocating motion of the loading device is only realized;
controlling an electromagnetic actuator of the six-degree-of-freedom platform, bending the flexible hinge to control the degree of freedom of the platform, and realizing multi-directional degree-of-freedom control of the cable;
the second motor 23 is controlled, the driving shaft 21 further controls the propeller 19 to rotate and drives the water flow in the character-returning water tank 2 to flow, the steering of the second motor 23 is controlled to control the water flow direction in the water tank to be clockwise or anticlockwise, the rotating speed of the second motor 23 is controlled to control the water flow speed in the water tank, and the control of the water flow in the character-returning water tank 2 is realized;
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 the 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 achieved, water flow is pushed to form artificial waves to simulate sea waves, the requirement that the sea waves are simulated is achieved, and the water flow is changed into stable water flow again through the pore plate on the right side of the test area;
in each experimental process, the deformation form of the cable 1 is recorded through whole-course video recording, the acrylic plate is used by the return-word water tank 2, graduation marks are arranged on the outer surface of the return-word water tank, deformation data of the cable 1 can be read, meanwhile, data of each sensor are collected, statistics and error analysis are carried out on the data, reasonable test results are given, and the influence rule of the bending hysteresis effect of the cable section on the whole dynamic response is analyzed. Each of the above experiments may be repeated multiple times to reduce errors.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (1)
1. The utility model provides an ocean wind power dynamic cable whole line type hydrodynamic response experimental apparatus which characterized in that:
the device comprises an experiment water tank, a six-degree-of-freedom motion platform and an experiment cable;
the center of the inside of the experiment water tank is provided with a center platform, the corners of the periphery of the experiment water tank are provided with chamfering devices, and the whole horizontal cross section of the experiment water tank is in a shape like a Chinese character 'Hui'; the experimental water tank is internally provided with a closed loop consisting of two straight line section areas and two semicircular annular areas, wherein the front end and the rear end of one straight line section area are provided with pore plates, the other straight line section area is provided with a flow generating system, and an area surrounded by the two pore plates, a central platform and the wall surface of the experimental water tank is used as an experimental area;
the experimental area is internally provided with a wave making system, a slide rail is arranged above the experimental area, the upper ends of the central platform and the wall surface of the experimental water tank are provided with a screw rod above the slide rail;
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 arranged at the lower end of the six-degree-of-freedom actuator through a flexible hinge; the two sides of the top mounting plate are respectively arranged on a sliding rail at the upper end of the experimental area through sliding blocks, and the sliding blocks are connected with the screw rod through screw rod nuts; the screw rod is connected with a coupler, and the coupler is connected with a first motor; the first motor drives the screw rod to rotate so as to push the six-degree-of-freedom motion platform to horizontally move; the upper end of the experimental cable is arranged at the lower end of the bottom mounting plate through a bending prevention device, and a cable accessory is arranged at the lower end of the experimental cable according to experimental requirements, so that the experimental cable is in a specific line type; the pipe cable accessory comprises a floating block and a positioning device; testing and simulating hydrodynamic responses of various lines by installing cable accessories at different positions of the experimental cable; the influence of different tube cable accessory arrangement modes on the integral linear hydrodynamic response of the experimental cable is tested and simulated by adjusting the number and the positions of the tube cable accessories, and the influence of the tube cable accessories on the integral linear hydrodynamic response of the experimental cable is tested by adjusting hydrodynamic response parameters of the tube cable accessories;
the flow-making system consists of a row of flow-making devices which are longitudinally and parallelly arranged in the opposite side straight line section area of the experimental area and are used for driving water flow in the character-returning water tank to flow reversely or clockwise; comprises a propeller, a fastening nut, a shaft, a coupling and a second motor; the propeller is arranged on a shaft and is screwed by a fastening nut, the shaft is connected with a coupler, the coupler is connected with a second motor, the second motor rotates to drive a driving shaft to rotate and drive the propeller to rotate, and four groups of flow-making devices are longitudinally arranged to manufacture water flow in a word-returning water tank; the rotation speed or the rotation direction of the motor of the flow manufacturing device is controlled, the flow speed or the flow direction of water is regulated, the sea water flow with different flow speeds is simulated, and the integral linear hydrodynamic response characteristic of the ocean dynamic cable under the condition of simulating stable water flow can be tested; the water flow enters through the left hole plate, waves are generated through the wave generating device, and the waves are changed into water flow again through the right hole plate and flow back in the water return tank to form water flow;
the wave making system comprises a wave making plate; the wave making plate is arranged in front of the orifice plate at one side of the experimental area, a guide rail is longitudinally arranged at the upper part of the wave making plate, and an exhaust movable push rod is arranged at the upper part of the orifice 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 and the wave making plate sliding block are connected through bolts and nuts to form pins, the wave making plate sliding block is connected with the wave making plate in a sliding mode, the pneumatic push rod pushes the connecting piece to drive the wave making plate sliding block to slide along the guide rail at the upper part of the wave making plate when in operation, the transverse pushing of the pneumatic push rod is converted into fixed shaft rotation of the wave making plate, and accordingly the wave making plate is pushed to swing in a reciprocating mode, and water flow is pushed to form artificial waves; 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 of the experimental water tank has waves, and the lower layer is stable water flow;
simulating the in-place operation working conditions of various marine dynamic cables by respectively controlling the flow manufacturing device, the wave manufacturing device and the six-degree-of-freedom motion platform, and experimentally simulating a certain working condition and the integral linear hydrodynamic response characteristics of the pipe cable under the complex condition of various working condition combinations;
the above device was tested based on the following method: the experimental device is obtained through assembly, the first motor and the second motor are connected with a power supply, the motor control switches are closed, and corresponding motors are correspondingly opened according to the motion state required to be carried out;
one end of the experiment cable is fixed on the six-degree-of-freedom motion platform, and the other end of the experiment cable is fixed on the weight, so that the experiment cable is ensured to keep a vertical state, or a floating block or a positioning device is properly arranged on the experiment cable, so that a specific line type is obtained; the pneumatic push rod is connected with the air cylinder, the switch of the control valve is closed, and the corresponding control valve is correspondingly opened according to the motion state required to be carried out;
according to experimental requirements, the inclination angle sensors are equidistantly arranged and stuck on the surface of the experimental cable, the strain gauge sensors are adhered to the experimental cable component, the tension and acceleration sensors are arranged at the joint of the experimental cable and the six-degree-of-freedom motion platform, meanwhile, one ends of flat cables connected with various sensors are fixed on the experimental cable by using 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 with the acquisition system, so that real-time transmission of the strain data is realized;
after the sensors are installed, the experimental device is subjected to preliminary debugging: loading the experimental cable in a small amplitude through the six-degree-of-freedom motion platform, analyzing the collected curve of the dip angle changing along with time, and carrying out the experiment after the test requirement is met;
the first motor is controlled to drive the screw rod to rotate, the screw rod nut is driven to drive the six-degree-of-freedom motion platform to horizontally move, and the reciprocating motion is controlled by controlling the rotation of the first motor, so that the reciprocating motion of the six-degree-of-freedom motion platform is only realized;
controlling an electromagnetic actuator of the six-degree-of-freedom motion platform, bending the flexible hinge to control the degree of freedom of the platform, and realizing multi-directional degree-of-freedom control of the experiment cable;
controlling a second motor, driving a shaft to further control the rotation of a propeller, driving water flow in a character-returning water tank to flow, controlling the direction of the second motor to control the water flow direction in the water tank to be clockwise or anticlockwise, and controlling the rotating speed of the second motor to control the water flow speed in the water tank to control the water flow in the character-returning water tank; the control valve of the pneumatic push rod of the wave making device is controlled to control the movement of the pneumatic push rod, so that the connecting piece is pushed, the wave making plate sliding block and the connecting piece rotate relatively, the wave making plate sliding block slides on the sliding rail of the wave making plate, the wave making plate swings back and forth, the experimental requirement that horizontal pushing is changed into relative swinging is achieved, water flow is pushed to form artificial waves to simulate ocean waves, the requirement that the waves are simulated is achieved, and the water flow is changed into stable water flow again through the pore plate on the right side of the test area.
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