Mooring model rigidity calibration device and calibration measurement method

Abstract

The invention belongs to the field of ocean engineering hydrodynamic tests, and discloses a mooring model rigidity calibration device and a calibration measurement method.The calibration device comprises a fixed rack, a rack guide rail is installed on the fixed rack, a sliding rack is installed on the rack guide rail, a sliding table guide rail is installed on the sliding rack, and a sliding block is installed on the sliding table guide rail; the sliding block and the sliding table are fixedly connected and can move along the sliding table guide rail together. A laser displacement distance measuring sensor is installed on one side of the sliding table. A laser baffle is installed at one end of the sliding rack. The sliding table is also provided with a first tension sensor and a measuring rotating plate; a rope wheel mechanism corresponding to the measuring rotating plate is also mounted on the fixed rack; a second tension sensor and a tilt angle sensor are mounted on the measuring rotating plate; the laser displacement distance measuring sensor, the first tension sensor, the second tension sensor and the tilt angle sensor are all connected with a data collector through data lines, and the data collector is connected with a data processing control system. And continuous, two-way, automatic and accurate measurement can be realized.

Description

Technical Field

[0001] The invention belongs to the technical field of marine engineering hydrodynamic tests, and in particular relates to a mooring model stiffness calibration device and a calibration measurement method for marine engineering floating structure tank tests. Background Art

[0002] At present, the most commonly used positioning system at sea is the mooring system. The characteristics of the mooring system include static characteristics and dynamic characteristics. For the simulation of dynamic characteristics, the geometric parameters (such as diameter, length) and weight of the mooring cable are mainly considered to achieve it. The static characteristics reflect the stiffness characteristics of the mooring system, that is, the tension of the mooring end point changes with the change of position, which directly affects the accuracy of the test results. Therefore, the accuracy of the calibration of the static characteristics of the mooring directly affects the accuracy of the entire test.

[0003] In the existing model test technology, the mooring model stiffness calibration mostly uses simple fixed brackets, tension sensors, tape measures, scales and other tools. The measurement method is: fix the mooring end anchor point, mount the mooring head end on the bracket, determine the initial position of the bracket according to the horizontal and vertical distances between the mooring anchor point and the hanging point calculated by the design and numerical model, move the bracket to make the mooring hanging point produce horizontal displacement, obtain multiple corresponding axial forces, measure the length of the mooring suspension section, calculate the horizontal force component by the catenary equation, and thus obtain the displacement-load characteristic curve of the mooring system. This measurement method has simple equipment and does not require complex test equipment. It can be completed by manual operation only. It is suitable for model tests that only require horizontal stiffness calibration.

[0004] However, this measurement method also has some limitations: (1) The measurement errors in each link are large, and most data are obtained by manual measurement, which is time-consuming and labor-intensive; (2) The measuring device has poor adaptability. Horizontal and vertical calibration measurements in air and water require the rearrangement of the test device. (3) The displacement-load relationship obtained by measurement is scattered data, and a curve fitting is required in the end, so continuous measurement cannot be achieved.

[0005] The above problems will reduce the accuracy of drawing the displacement-load characteristic curve of the mooring system and reduce the reliability of the test results.

[0006] Chinese invention patent application CN109839312A discloses a static stiffness calibration device for mooring cables in air, a vertical screw, a vertical frame, a wall fixing plate, a vertical slide, a horizontal frame, a horizontal slide, a horizontal ball screw, a servo motor and a driver, a control cabinet, etc. The wall fixing plate is connected to the wall, the fixing plate is fixedly connected to the vertical frame, a vertical slider is arranged on the vertical frame, one end of the screw is connected to the mounting frame through a first bearing assembly, the other end of the screw extends into the motor mounting seat and is connected to the second bearing assembly, the driving wheel shaft is connected to the screw through a transmission assembly, the horizontal frame is connected to the vertical slider, one end of the horizontal ball screw is connected to the horizontal frame through a first bearing assembly, the other end of the horizontal ball screw extends into the motor mounting seat and is connected to the second bearing assembly, the driving wheel shaft is connected to the screw through a transmission assembly, and a horizontal slider is arranged on the horizontal frame. This patent can achieve horizontal and vertical displacement of the mooring point when measuring the stiffness of the mooring model, and uses a motor and a ball screw to complete the automatic operation of the two-way displacement, thereby improving the efficiency and accuracy of the mooring stiffness measurement. However, it has the following shortcomings: (1) The layout of the calibration device is relatively limited and needs to be fixed on a wall or an external support, and it is impossible to achieve underwater mooring stiffness measurement; (2) The measuring device can only complete the stiffness calibration of the mooring in the horizontal and vertical directions, and cannot simulate the motion characteristics of the mooring under the platform's bow pitch and roll.

[0007] Chinese invention patent application CN119023178A discloses a test device for the stiffness of a floating platform mooring system and a method for using the test device, which includes a floating platform model; at least three mechanical winches, on which retractable steel wire ropes are wound; the other ends of the plurality of steel wire ropes are passed around a guide pulley and connected to the same side of the floating platform model; and the steel wire ropes are connected to a tension sensor capable of measuring force. This patent uses a mechanical winch and a steel wire rope to force the floating platform to move, and uses a six-degree-of-freedom gyroscope to identify the posture of the floating platform, so that the floating platform moves in a single degree of freedom, reducing the impact of multiple degrees of freedom and improving the accuracy of mooring stiffness measurement. However, it has the following shortcomings: (1) Multiple mechanical winches need to be fixed on the same fixed platform, which has high requirements for the layout of the fixed platform, especially during underwater tests; (2) The tension sensor is arranged on the steel wire rope and cannot directly measure the mooring tension. When there is an angle between the steel wire rope and the horizontal plane, an additional angle measurement device needs to be added; (3) For the simulation of the bow roll and roll motion of the floating platform, the layout of the mechanical winch and the fixed platform needs to be reconsidered, and the measurement is more complicated.

[0008] Chinese invention patent application CN109696293A discloses a deep-sea multi-column moored floating platform vortex-induced motion pool test device, including a trailer, a longitudinal motion guide rail mechanism, a lateral motion guide rail mechanism, a bow roll rotation mechanism, an optical measurement mechanism, and a top plate for installing a floating platform model, a longitudinal elastic member for determining the longitudinal stiffness is also provided between the trailer and the lateral motion guide rail mechanism, a lateral elastic member for determining the lateral stiffness is also provided between the lateral motion guide rail mechanism and the bow roll rotation mechanism, and an elastic constraint member for determining the rotation stiffness is also provided between the bow roll rotation bracket and the connecting main shaft. This patent utilizes a guide rail mechanism, a bow roll rotation mechanism, and a connecting top plate to achieve the simulation of the longitudinal and lateral horizontal movement and bow roll motion of a floating platform. At the same time, a trailer-mounted test device can be used to simulate the underwater translation and bow roll motion of a floating platform, providing conditions for the calibration of the mooring stiffness. However, the following shortcomings exist: (1) Although the motion simulation of the floating platform is achieved, additional measurement equipment is still required for the calibration of the mooring stiffness. In addition, the test device is relatively complex, which increases the measurement cost of the mooring stiffness calibration. (2) It is impossible to simulate the motion characteristics of the mooring under the heave and roll of the platform.

[0009] In order to overcome these problems, there is an urgent need for a measurement device and scheme that can be applied to bidirectional and multi-scenario mooring model stiffness calibration, using a special mechanical device to load and control displacement and force, so as to improve the scientific nature of the test method and the reliability of the measurement data. Summary of the invention

[0010] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art and to provide a mooring model stiffness calibration device and a calibration measurement method, which can realize continuous, two-way, automatic and precise measurement, thereby meeting the requirements of mooring model stiffness calibration.

[0011] To achieve the above object, the present invention adopts the following technical solutions: A mooring model stiffness calibration device comprises a fixed frame, a frame guide rail is installed on the fixed frame, a sliding frame that can slide along the frame guide rail is installed on the sliding frame, a slide rail is installed on the sliding frame, a slider is installed on the slide rail, the slider is fixedly connected to the slide and can move along the slide rail together; a laser displacement ranging sensor is installed on one side of the slide, and a laser baffle corresponding to the laser displacement ranging sensor is installed on one end of the sliding frame; a first tension sensor and a rotatable measuring rotating plate are also installed on the slide; a rope pulley mechanism corresponding to the measuring rotating plate is also installed on the fixed frame; a second tension sensor and an inclination sensor are installed on the measuring rotating plate; the laser displacement ranging sensor, the first tension sensor, the second tension sensor and the inclination sensor are all connected to a data collector through a data line, and the data collector is connected to a data processing and control system.

[0012] The upper part of the fixed frame is a square frame structure, which is installed on the foldable and telescopic legs through leg clamps, and universal wheels are installed at the bottom of the foldable and telescopic legs.

[0013] The left and right side frames of the square frame structure are respectively provided with rack guide rails; and the rear end frame of the square frame structure is provided with a rope pulley mechanism.

[0014] There are two sliding racks, which are respectively installed on two rack guide rails through locking knobs, and the front ends of the two sliding racks are connected with handles.

[0015] There are two slide rails, which are respectively mounted on two slide racks; there are two slide blocks, which are respectively clamped on the slide rails and can be locked by a locking knob.

[0016] Both ends of the slide rail are respectively provided with rail end covers to prevent the slider from derailing.

[0017] The slide table is one, and two ends thereof are respectively fixedly mounted on two sliding blocks.

[0018] A groove is opened in the slide part located in the middle of the slide rail, and the rotating shafts at both ends of the measuring turntable are installed in the groove through bearings. A positioning gear is installed at the end of the rotating shaft at one end, and the slide is provided with a positioning key that cooperates with the positioning gear to limit the rotation of the measuring turntable.

[0019] The rope pulley mechanism comprises a servo motor mounted on a rear end frame of a square frame structure, the output shaft of the servo motor is connected to the input shaft of a gear box through a coupling, a rope pulley is mounted on the input shaft of the gear box, and a rope is wound around the rope pulley.

[0020] A turntable is installed on the output shaft of the gear box, and a fairlead hole is arranged on the turntable.

[0021] The first tension sensor is provided with a rope hole corresponding to the rope wheel.

[0022] The second tension sensor is installed in a slot on the measuring rotating plate, and a support plate is installed on the upper part of the slot.

[0023] A calibration measurement method for a mooring model stiffness calibration device, comprising: A. Measuring sliding friction: The turntable is not installed, the position and height of the stiffness calibration device are fixed, a thin rope is drawn out from the rope wheel and connected to the first tension sensor, the rope wheel is fixed so that it cannot rotate, and the handle is pulled. At this time, the sliding frame slides relative to the fixed frame and the slide table, and the slide table is stationary relative to the fixed frame under the traction of the thin rope. The tension collected by the first tension sensor is the sliding friction between the slider and the slide table guide rail; B. Horizontal stiffness calibration of mooring model in air: without installing a turntable, fix the end anchor point of the mooring model, mount the head end of the mooring model on the second tension sensor, move the stiffness calibration device horizontally, adjust the telescopic legs to change the height of the stiffness calibration device, so that the horizontal distance and vertical distance between the mooring hanging point and the anchor point are consistent with the distance calculated by numerical simulation; the data processing control system controls the operation of the servo motor, the servo motor drives the rope wheel to rotate step by step or continuously, and then uses the thin rope to drive the slide and the slider to slide step by step or continuously along the slide rail, the laser displacement ranging sensor cooperates with the laser baffle to measure the horizontal displacement of the mooring hanging point, at the same time, the first tension sensor measures the horizontal tension, the second tension sensor measures the mooring axial tension, and the inclination sensor measures the angle between the mooring axial direction and the horizontal direction; the corresponding displacement and mooring axial force of the mooring model are measured, and the horizontal force and vertical force of the mooring hanging point can be calculated according to the mooring axial force and the angle between the mooring axial direction and the horizontal direction, and finally the displacement-horizontal force characteristic curve of the mooring model is drawn to obtain the horizontal stiffness characteristics of the mooring model; C. Vertical stiffness calibration of mooring model in air: without installing a turntable, the stiffness calibration device is arranged vertically by rotating and folding the telescopic legs, the anchor point at the end of the mooring model is fixed, the head end of the mooring model is mounted on the second tension sensor, the stiffness calibration device is moved horizontally, and the telescopic legs are adjusted to change the height of the stiffness calibration device, so that the horizontal and vertical distances between the mooring hanging point and the anchor point are consistent with the distances calculated by numerical simulation; the data processing control system controls the servo motor to work, and the servo motor drives the rope wheel to rotate step by step or continuously, and then uses the thin rope to drive the slide and the slider along the The guide rail of the slide table moves in steps or slides continuously, and the laser displacement ranging sensor cooperates with the laser baffle to measure the vertical displacement of the mooring hanging point. At the same time, the first tension sensor measures the vertical tension, the second tension sensor measures the mooring axial tension, and the inclination sensor measures the angle between the mooring axial direction and the horizontal direction. The corresponding displacement and mooring axial force of the mooring model are measured, and the horizontal force and vertical force of the mooring hanging point can be calculated according to the mooring axial force and the angle between the mooring axial direction and the horizontal direction. Finally, the displacement-vertical force characteristic curve of the mooring model is drawn to obtain the vertical stiffness characteristics of the mooring model. D. Stiffness calibration of the mooring model in water: The method is the same as the stiffness calibration method of the mooring model in air. The mooring model and the stiffness calibration device are placed in the test pool. The test is repeated in the horizontal and vertical arrangements in turn to measure the horizontal and vertical stiffness characteristics of the mooring model in water without the need for additional equipment and devices. E. Simulate the dynamic response of mooring under the rolling and pitching motion of floating structure: install the turntable, remove the slide frame, slider, slide table and measuring turntable, fix the anchor point at the end of the mooring model, connect the third tension sensor at the head end of the mooring model, mount the third tension sensor on the fairlead hole of the turntable, move the stiffness calibration device horizontally, adjust the telescopic legs to change the height of the stiffness calibration device, so that the horizontal and vertical distances between the mooring hanging point and the anchor point are consistent with the distances calculated by numerical simulation; the data processing and control system controls the operation of the servo motor, and the servo motor drives the turntable to reciprocate in the plane, and uses the third tension sensor to measure the axial tension of the mooring to realize the dynamic response simulation of the mooring model under the rolling and pitching motion of floating structure.

[0024] The beneficial effects of the present invention are: 1. The device has a compact and reasonable structure and is easy to operate. According to the mooring operation depth and displacement requirements, the device can be lifted and lowered and automatically displaced, reducing human intervention; 2. Accurate measurement, using sensors to collect data, improving data accuracy and reliability, and eliminating the influence of human factors; 3. Widely used. The device can be used for the calibration of mooring stiffness in the air or in the water pool. It can meet the displacement requirements in both horizontal and vertical directions. The device can also be used to simulate the dynamic response of mooring under the rolling and bowing motion of floating structures. 4. The present invention utilizes a slide table and a tension sensor to improve the sliding friction measurement method, thereby avoiding the human error of manually applying uniform motion to measure sliding friction, making the corrected measurement value more accurate. At the same time, a servo motor is used to achieve continuous displacement of the mooring point, and the displacement-load relationship obtained through data acquisition can more accurately reflect the characteristics of the mooring model. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the supporting part of the present invention; Figure 3 It is a schematic diagram of the sliding part of the present invention; Figure 4 It is a schematic diagram of the measurement part of the present invention; Figure 5 This is a schematic diagram of the measuring part of the present invention without the support plate and the inclination sensor; Figure 6 It is a schematic diagram of the calibration measurement of the horizontal stiffness of the mooring model in air of the present invention; Figure 7 It is a schematic diagram of the vertical stiffness calibration measurement of the mooring model in air of the present invention; Figure 8 This is a schematic diagram of the arrangement for simulating the rolling dynamic response of a floating structure according to the present invention; Fig. 9 The schematic diagram of the arrangement for simulating the dynamic response of the bow roll of a floating structure according to the present invention; Fig.10 It is a schematic diagram of the data acquisition system of the present invention; Among them, 1-fixed frame, 2-handle, 3-sliding frame, 4-slider, 5-slide, 6-leg clamp, 7-folding telescopic leg, 8-universal wheel, 9-frame guide rail, 10-servo motor, 11-coupling, 12-pulley, 13-gear box, 14-turntable, 15-laser baffle, 16-slide rail, 17-laser displacement ranging sensor, 18-guide rail end cover, 19-bearing, 20-measuring turntable, 21-first tension sensor, 22-rope hole, 23-positioning card key, 24-positioning gear, 25-support plate, 26-tilt sensor, 27-second tension sensor, 28-data collector, 29-computer host, 30-display. DETAILED DESCRIPTION

[0026] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0027] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical contents disclosed by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical contents.

[0028] like Figure 1-Figure 10 As shown, the mooring model stiffness calibration device includes a mooring model stiffness calibration device body and a data acquisition and analysis system.

[0029] Among them, a rack guide rail 9 is installed on the fixed frame 1, and the rack guide rail 9 is fixedly connected to the fixed frame 1 by hexagon socket bolts. A sliding frame 3 is installed on the frame guide rail 9, and the end of the sliding frame 3 is connected to the handle 2 by bolts. Pulling the handle 2 can make the sliding frame 3 slide along the rack guide rail 9, and the position of the sliding frame 3 can be fixed by using the locking knob of the sliding frame 3. A slide rail 16 is installed on the sliding frame 3, and the slide rail 16 is fixedly connected to the sliding frame 3 by hexagon socket bolts. A slider 4 is installed on the slide rail 16, and the slider 4 is fixedly connected to the slide 5 by hexagon socket bolts. The slide 5 and the slider 4 can slide along the slide rail 16 together, and the position of the slider 4 and the slide 5 can be fixed by using the locking knob of the slider 4. Guide rail end covers 18 are installed at both ends of the slide rail 16 to prevent the slider 4 from derailing.

[0030] A servo motor 10 and a gear box 13 are arranged at the rear end of the fixed frame 1. The servo motor 10 and the gear box 13 are connected by a coupling 11. The gear box 13 has an input end and an output end. A pulley 12 is installed on the input shaft, and a turntable 14 is installed on the output end. A cable guide hole is arranged on the turntable 14.

[0031] A groove is provided on the slide 5, and three bearings 19 and a positioning key 23 are installed in the groove accordingly. The rotating shaft of the measuring turntable 20 is installed in cooperation with the bearing 19, and the measuring turntable 20 can rotate around the rotating shaft. A positioning gear 24 is installed at one end of the rotating shaft of the measuring turntable 20, and the positioning gear 24 cooperates with the positioning key 23 on the slide 5 to limit the rotation of the measuring turntable 20. The first tension sensor 21 is fixed behind the rope hole 22 by a hexagon socket bolt, the second tension sensor 27 is fixed under the support plate 25 by a hexagon socket bolt, the inclination sensor 26 is fixed to the measuring turntable 20 by a hexagon socket bolt, the laser displacement ranging sensor 17 is installed on the left side of the slide 5, and the laser baffle 15 is fixed to the front end of the left frame of the sliding frame 3 by a hexagon socket bolt.

[0032] There are four groups of foldable and telescopic legs 7 as supports below the fixed frame 1. The foldable and telescopic legs 7 are fixedly connected to the leg clamps 6 by hexagon socket bolts. The leg clamps 6 are clamped under the fixed frame 1. The foldable and telescopic legs 7 can be axially extended or fixed in position, and can also be rotated within a right angle range along the rotating shaft through an arc-shaped notch mechanism. Universal wheels 8 are installed at the bottom of the foldable and telescopic legs 7, and the universal wheels 8 can be turned or fixed in a horizontal plane.

[0033] The head end of the mooring model is mounted on the second tension sensor 27, and the thin rope led out from the rope wheel 12 on the gearbox input shaft is connected to the first tension sensor 21; The laser displacement ranging sensor 17, the first tension sensor 21, the inclination sensor 26 and the second tension sensor 27 are all connected to the data collector 28 via data cables. The data collector 28 collects the analog signals output by the sensors and converts them into digital signals, and then transmits the digital signals to the computer host 29 to realize automatic and continuous data collection and analysis. The computer host 29 is connected to the display 30.

[0034] The specific working process of the present invention is as follows: Measure the sliding friction: do not install the turntable 14, fix the position and height of the stiffness calibration device, lead out a thin rope from the pulley 12 and connect it to the first tension sensor 21, fix the pulley 12 so that it cannot rotate, pull the handle 2, at this time the sliding frame 3 slides relative to the fixed frame 1 and the slide 5, the slide 5 is stationary relative to the fixed frame 1 under the traction of the thin rope, and the tension collected by the first tension sensor 21 is the sliding friction between the slider 4 and the slide guide rail 16.

[0035] Calibration of horizontal stiffness of mooring model in air: Figure 6 , do not install the turntable 14, fix the anchor point at the end of the mooring model, mount the head end of the mooring model on the second tension sensor 27, move the stiffness calibration device horizontally, adjust the telescopic legs to change the height of the stiffness calibration device, so that the horizontal distance and vertical distance between the mooring hanging point and the anchor point are consistent with the distance obtained by numerical simulation calculation; give operation instructions through the human-machine interface of the operating table computer, and the PLC controller receives the control instructions through serial communication to control the servo motor 10 to work, and the servo motor 10 drives the rope wheel 12 to rotate step by step or continuously, and then use the thin rope to drive the slide 5 and the slider 4 to slide step by step or continuously along the slide rail 16, and the laser displacement ranging sensor 17 cooperates with the laser baffle 15 to measure the horizontal displacement of the mooring hanging point. At the same time, the first tension sensor 21 measures the horizontal tension, the second tension sensor 27 measures the mooring axial tension, and the inclination sensor 26 measures the angle between the mooring axial direction and the horizontal direction; the corresponding displacement and mooring axial force of the mooring model are measured, and the horizontal force and vertical force of the mooring hanging point can be calculated according to the magnitude of the mooring axial force and the angle between the mooring axial direction and the horizontal direction. Finally, the displacement-horizontal force characteristic curve of the mooring model is drawn to obtain the horizontal stiffness characteristics of the mooring model; Calibration of vertical stiffness of mooring model in air: Figure 7, without installing the turntable 14, the stiffness calibration device is arranged vertically by rotating and folding the telescopic legs 7, the anchor point at the end of the mooring model is fixed, the head end of the mooring model is mounted on the second tension sensor 27, the stiffness calibration device is moved horizontally, and the telescopic legs are adjusted to change the height of the stiffness calibration device, so that the horizontal distance and vertical distance between the mooring hanging point and the anchor point are consistent with the distance calculated by numerical simulation. The operation instructions are given through the human-machine interface of the operating table computer, and the PLC controller receives the control instructions through serial communication to control the servo motor 10 to work, and the servo motor 10 drives the rope wheel 12 to rotate step by step or continuously, and then uses the thin rope to drive the slide 5 and the slider 4 to slide step by step or continuously along the slide rail 16, and the laser displacement ranging sensor 17 cooperates with the laser baffle 15 to measure the vertical displacement of the mooring hanging point. At the same time, the first tension sensor 21 measures the vertical tension, the second tension sensor 27 measures the mooring axial tension, and the inclination sensor 26 measures the angle between the mooring axial direction and the horizontal direction; the corresponding displacement and mooring axial force of the mooring model are measured, and the horizontal force and vertical force of the mooring hanging point can be calculated from the magnitude of the mooring axial force and the angle between the mooring axial direction and the horizontal direction. Finally, the displacement-vertical force characteristic curve of the mooring model is plotted to obtain the vertical stiffness characteristics of the mooring model.

[0036] Stiffness calibration of the mooring model in water: The method is the same as the stiffness calibration method of the mooring model in air. The mooring model and the stiffness calibration device are placed in the test pool. The test is repeated in horizontal and vertical arrangements in turn to measure the horizontal and vertical stiffness characteristics of the mooring model in water without the need for additional equipment and devices.

[0037] Simulate the dynamic response of the mooring under the rolling and pitching motion of the floating structure: Figure 8 , Fig. 9 , install the turntable 14, remove the sliding measurement part (including the sliding frame 3, the slider 4, the slide 5, the measuring turntable 20, etc.), fix the anchor point at the end of the mooring model, connect the third tension sensor at the head end of the mooring model, mount the third tension sensor on the fairlead hole of the turntable 14, move the stiffness calibration device horizontally, adjust the telescopic legs to change the height of the stiffness calibration device, so that the horizontal distance and vertical distance between the mooring hanging point and the anchor point are consistent with the distance calculated by numerical simulation; give operation instructions through the human-machine interface of the operating table computer, receive the control instructions through the serial port communication, control the servo motor 10 to work, the servo motor 10 drives the turntable 14 to reciprocate in the plane, use the third tension sensor to measure the mooring axial tension, and realize the dynamic response simulation of the mooring model under the rolling and bow pitching motion of the floating structure; Figure 8 , Fig. 9 They are schematic diagrams of roll and bow roll simulation arrangements respectively; In summary, the mooring model stiffness calibration device for marine engineering floating structure tank test proposed in the present invention can realize continuous, two-way, automatic and precise measurement of the mooring model stiffness calibration.

[0038] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. A mooring model stiffness calibration device, characterized in that: The invention comprises a fixed frame, a frame guide rail is installed on the fixed frame, a sliding frame which can slide along the frame guide rail is installed on the sliding frame, a slide rail is installed on the sliding frame, a slider is installed on the slide rail, the slider is fixedly connected to the slide and can move along the slide rail together; a laser displacement ranging sensor is installed on one side of the slide, and a laser baffle corresponding to the laser displacement ranging sensor is installed on one end of the sliding frame; a first tension sensor and a rotatable measuring turntable are also installed on the slide; a rope pulley mechanism corresponding to the measuring turntable is also installed on the fixed frame; a second tension sensor and an inclination sensor are installed on the measuring turntable; the laser displacement ranging sensor, the first tension sensor, the second tension sensor and the inclination sensor are all connected to a data collector through a data line, and the data collector is connected to a data processing and control system.

2. The mooring model stiffness calibration device according to claim 1, characterized in that: The upper part of the fixed frame is a square frame structure, which is installed on the foldable and telescopic legs through leg clamps, and universal wheels are installed at the bottom of the foldable and telescopic legs; the left and right side frames of the square frame structure are respectively installed with frame guide rails; and the rear end frame of the square frame structure is installed with a rope pulley mechanism.

3. The mooring model stiffness calibration device according to claim 1, characterized in that: There are two sliding racks, which are respectively installed on two rack guide rails through locking knobs, and the front ends of the two sliding racks are connected with handles.

4. The mooring model stiffness calibration device according to claim 1, characterized in that: There are two slide rails, which are respectively mounted on two slide racks; there are two slide blocks, which are respectively clamped on the slide rails and can be locked by a locking knob.

5. The mooring model stiffness calibration device according to claim 1, characterized in that: Both ends of the slide rail are respectively provided with rail end covers to prevent the slider from derailing.

6. The mooring model stiffness calibration device according to claim 1, characterized in that: There is one slide, and its two ends are fixedly mounted on two sliders respectively; a groove is opened in the slide part located in the middle of the slide rail, and the rotating shafts at both ends of the measuring turntable are installed in the groove through bearings, and a positioning gear is installed at the end of the rotating shaft at one end, and the slide is provided with a positioning card key that cooperates with the positioning gear to limit the rotation of the measuring turntable.

7. The mooring model stiffness calibration device according to claim 1, characterized in that: The rope pulley mechanism comprises a servo motor mounted on a rear end frame of a square frame structure, the output shaft of the servo motor is connected to the input shaft of a gear box through a coupling, a rope pulley is mounted on the input shaft of the gear box, and a rope is wound around the rope pulley.

8. The mooring model stiffness calibration device according to claim 7, characterized in that: A turntable is installed on the output shaft of the gear box, and a fairlead hole is arranged on the turntable.

9. The mooring model stiffness calibration device according to claim 7, characterized in that: The first tension sensor is provided with a rope hole corresponding to the rope wheel; the second tension sensor is installed in a slot on the measuring rotating plate, and a supporting plate is installed on the upper part of the slot.

10. A calibration measurement method for a mooring model stiffness calibration device, characterized in that: include: A. Measuring sliding friction: The turntable is not installed, the position and height of the stiffness calibration device are fixed, a thin rope is drawn out from the rope wheel and connected to the first tension sensor, the rope wheel is fixed so that it cannot rotate, and the handle is pulled. At this time, the sliding frame slides relative to the fixed frame and the slide table, and the slide table is stationary relative to the fixed frame under the traction of the thin rope. The tension collected by the first tension sensor is the sliding friction between the slider and the slide table guide rail; B. Horizontal stiffness calibration of mooring model in air: without installing a turntable, fix the end anchor point of the mooring model, mount the head end of the mooring model on the second tension sensor, move the stiffness calibration device horizontally, adjust the telescopic legs to change the height of the stiffness calibration device, so that the horizontal distance and vertical distance between the mooring hanging point and the anchor point are consistent with the distance calculated by numerical simulation; the data processing control system controls the operation of the servo motor, the servo motor drives the rope wheel to rotate step by step or continuously, and then uses the thin rope to drive the slide and the slider to slide step by step or continuously along the slide rail, the laser displacement ranging sensor cooperates with the laser baffle to measure the horizontal displacement of the mooring hanging point, at the same time, the first tension sensor measures the horizontal tension, the second tension sensor measures the mooring axial tension, and the inclination sensor measures the angle between the mooring axial direction and the horizontal direction; the corresponding displacement and mooring axial force of the mooring model are measured, and the horizontal force and vertical force of the mooring hanging point can be calculated according to the mooring axial force and the angle between the mooring axial direction and the horizontal direction, and finally the displacement-horizontal force characteristic curve of the mooring model is drawn to obtain the horizontal stiffness characteristics of the mooring model; C. Vertical stiffness calibration of mooring model in air: without installing a turntable, the stiffness calibration device is arranged vertically by rotating and folding the telescopic legs, the anchor point at the end of the mooring model is fixed, the head end of the mooring model is mounted on the second tension sensor, the stiffness calibration device is moved horizontally, and the telescopic legs are adjusted to change the height of the stiffness calibration device, so that the horizontal and vertical distances between the mooring hanging point and the anchor point are consistent with the distances calculated by numerical simulation; the data processing control system controls the servo motor to work, and the servo motor drives the rope wheel to rotate step by step or continuously, and then uses the thin rope to drive the slide and the slider along the The guide rail of the slide table moves in steps or slides continuously, and the laser displacement ranging sensor cooperates with the laser baffle to measure the vertical displacement of the mooring hanging point. At the same time, the first tension sensor measures the vertical tension, the second tension sensor measures the mooring axial tension, and the inclination sensor measures the angle between the mooring axial direction and the horizontal direction. The corresponding displacement and mooring axial force of the mooring model are measured, and the horizontal force and vertical force of the mooring hanging point can be calculated according to the mooring axial force and the angle between the mooring axial direction and the horizontal direction. Finally, the displacement-vertical force characteristic curve of the mooring model is drawn to obtain the vertical stiffness characteristics of the mooring model. D. Stiffness calibration of the mooring model in water: The method is the same as the stiffness calibration method of the mooring model in air. The mooring model and the stiffness calibration device are placed in the test pool. The test is repeated in the horizontal and vertical arrangements in turn to measure the horizontal and vertical stiffness characteristics of the mooring model in water. No additional equipment or devices are required. E. Simulate the dynamic response of mooring under the rolling and pitching motion of floating structure: install the turntable, remove the slide frame, slider, slide table, and measurement turntable module, fix the end anchor point of the mooring model, connect the head end of the mooring model to the third tension sensor, mount the tension sensor on the turntable fairlead hole, move the stiffness calibration device horizontally, adjust the telescopic legs to change the height of the stiffness calibration device, so that the horizontal and vertical distances between the mooring hanging point and the anchor point are consistent with the distances calculated by numerical simulation; the data processing and control system controls the operation of the servo motor, and the servo motor drives the turntable to reciprocate in the plane. The third tension sensor is used to measure the axial tension of the mooring to realize the dynamic response simulation of the mooring model under the rolling and pitching motion of the floating structure.

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