CN111366332A - Three-degree-of-freedom decomposition mooring structure measurement experimental device - Google Patents
Three-degree-of-freedom decomposition mooring structure measurement experimental device Download PDFInfo
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Abstract
The invention relates to the technical field of measurement experiment equipment, in particular to a three-degree-of-freedom decomposition mooring structure measurement experiment device which comprises a device frame, a Z-direction measurement system, a Y-direction measurement system and an X-direction rotation measurement system. Under the action of waves, the device frame and the object to be measured move up and down along the z axis, and the object to be measured moves back and forth along the y axis and rotates along the x axis. The device has reasonable design and simple structure, and can effectively measure the three-degree-of-freedom motion and dynamic response of the object to be measured.
Description
Technical Field
The invention relates to the technical field of measurement experiment equipment, in particular to a three-degree-of-freedom decomposition mooring structure measurement experiment device.
Background
The motions of ships or offshore structures such as buoys, net cages, floating breakwaters and the like mainly have six forms: roll, pitch, yaw, heave, yaw, pitch. Among them, rolling occurs most easily, and the influence of the structure is the largest. In extreme cases, even structural damage can result. Most of the existing model test equipment simulates the shaking state of a structure through some mechanical structures, and has some differences with waves in a real state, so that a set of measuring system suitable for multiple degrees of freedom in a real wave state needs to be designed to solve the practical problem, and the mechanism for generating kinematic coupling is researched from the experiment. Ships or offshore structures need to face complex offshore working environments, and in the design process of the offshore structures, the motion and dynamic response of the structures need to be analyzed through model mooring experiments. Under the experimental conditions of unidirectional waves in the test flume, the model mainly has three degrees of freedom of motion: surge, heave and pitch. At present, most of model mooring experiments determine mooring conditions through preliminary estimation, and the experiment cost is high. Therefore, a three-degree-of-freedom decomposition mooring structure measurement experimental device needs to be designed, and is used for measuring the stress condition and the motion response of a model under experimental conditions and providing reference for model mooring condition analysis.
Disclosure of Invention
The invention aims to overcome at least one defect of the prior art and provides a three-degree-of-freedom decomposition mooring structure measurement experimental device which is reasonable in design and simple in structure, can effectively decompose and measure longitudinal and vertical displacement, stress, angular displacement and torque around a transverse axis and mooring force of a mooring structure, and meets the three-degree-of-freedom measurement requirements of a model mooring experiment of a floating structure.
The technical scheme adopted by the invention is as follows:
a three-degree-of-freedom decomposition mooring structure measurement experimental device is used for measuring the stress condition and motion response of an object to be measured; the device comprises a device frame, a Z-direction measuring system, a Y-direction measuring system and an X-direction rotation measuring system, wherein the water flow direction is set as a Y-axis, the direction vertical to the water surface is set as a Z-axis upwards, the X-axis is vertical to the Y-axis and the Z-axis, and the X-axis, the Y-axis and the Z-axis form a right-hand coordinate system. Under the action of waves, the device frame and the object to be measured move up and down along the z axis, and the object to be measured moves back and forth along the y axis and rotates along the x axis.
The experimental device can perform simulation measurement in a water pool. The device comprises a water tank, a device frame, a measuring model, a measuring device and a control device, wherein the water tank simulates the sea, the device frame is arranged in the water tank, an object to be measured simulates a real ship body, the device frame limits the movement of the object to be measured, the movement of the object to be measured is reasonably decomposed into surging, heaving and pitching, and the stress condition and the movement response of the measuring model under the experimental condition are measured by installing the measuring device, so that the reference is provided for the analysis of the mooring condition.
The device frame is formed by a plurality of cross rods and vertical rods in an enclosing manner; further, the device frame is surrounded to form a polygonal structure.
Furthermore, the device frame is provided with a first straight rod above the upward extension, the Z-direction measuring system comprises a vertical sliding block, a fixed guide rail and a sensor device, the first straight rod is connected with the lower end of the vertical sliding block, the sensor device is connected with the upper end of the vertical sliding block, the vertical sliding block slides in the fixed guide rail, and the device frame drives the object to be measured to move up and down along the Z axis under the influence of water waves.
Furthermore, the fixed guide rail comprises four vertical sub-guide rails and a fixed seat, the fixed seat is connected with the upper ends of the four vertical sub-guide rails, the four vertical sub-guide rails are erected in a direction parallel to the z-axis direction, the vertical sliding block moves on the four vertical sub-guide rails in the z-axis direction, limiting baffles are arranged at the lower ends of the four vertical sub-guide rails and used for fixing the vertical sliding block and the vertical sub-guide rails, and the vertical sliding block is prevented from being separated from the vertical sub-guide rails.
Further, the sensor device comprises a displacement sensor for measuring the motion response of the object to be measured and the device frame along the z axis, or the sensor comprises a tension and pressure sensing device which comprises a spring and a tension and pressure sensor, the spring is respectively connected with the vertical slide block and the fixed guide rail, and the dynamic response of the object to be measured is obtained by measuring the dynamic response of the spring.
Wherein for models with determined mooring conditions, the motion response may be measured by displacement sensors for further analysis. The displacement sensor is used for measuring the motion response of the object to be measured and the device frame along the z-axis.
In the technical scheme, as another implementation manner, for a model with undetermined mooring condition, the stress and the motion response under the constraint condition can be measured simultaneously through the spring and the pull pressure sensor. In the technical scheme, the device frame is influenced by waves, the force is transmitted to the vertical sliding block through the first straight rod, the vertical sliding block slides up and down in the vertical sub-guide rail, and the tension pressure sensor device in the vertical sliding block measures the power response of the vertical sliding block. The tension and pressure sensing device comprises a spring and a tension and pressure sensor, wherein the spring is respectively connected with the vertical sliding block and the fixed guide rail. The fixed seat is fixed above the vertical sub-guide rail, and the device frame is limited, so that the device frame can only move in the z-axis direction.
The springs are respectively connected with the vertical sliding blocks and the fixed seats on the fixed guide rails, the direction of the tensile pressure borne by the springs is along the vertical track, namely along the Z direction, and the tensile pressure sensing device measures the Z-direction mooring power response of the object to be measured under the spring constraint condition. The motion response under the constraint condition can be obtained because the spring has a good linear relation between force and displacement. After the dynamic response of the spring is obtained, the dynamic response rule of the object to be measured can be further analyzed and obtained according to the stress and motion relation between the spring and the object to be measured.
Furthermore, a second straight rod is arranged in the downward extending direction of the device frame, the Y-direction measuring system comprises a connecting seat, a horizontal guide rail and a horizontal sliding block, the connecting seat is sleeved on the second straight rod, the two ends of the connecting seat and the horizontal guide rail are respectively connected with the connecting seat, the horizontal guide rail and the horizontal sliding block are erected on the horizontal guide rail and are connected, the horizontal guide rail is erected on the second straight rod along the Y axis, an object to be measured is connected with the horizontal sliding block through a connecting shaft, and the object to be measured and the horizontal sliding block move back and forth along the Y axis together.
Because the device frame can only move in the z-axis direction, the arrangement of the horizontal guide rail can ensure that the object to be measured can move in the y-axis direction.
Furthermore, a displacement sensor is arranged on the connecting seat and used for measuring the motion response of the object to be measured and the horizontal sliding block along the y axis, or a tension and pressure sensing device is arranged on the connecting seat.
In the technical scheme, for the model with determined mooring conditions, the motion response of the object to be measured and the device frame along the y axis can be measured through the displacement sensor.
For a model with undetermined mooring condition, the motion response under the stress and the constraint condition can be measured simultaneously by pulling and pressing the pressure sensing device. The connecting socket itself is also a mooring mechanism that can be used to install mooring lines.
Further, the tension and pressure sensing device comprises a spring and a tension and pressure sensor, the spring is respectively connected with the horizontal sliding block and the connecting seat, the tension and pressure direction borne by the spring is along the horizontal track, namely along the Y direction, and the tension and pressure sensing device measures the Y direction mooring power response of the object to be measured under the spring constraint condition. The motion response under the constraint condition can be obtained because the spring has a good linear relation between force and displacement. After the dynamic response of the spring is obtained, the dynamic response rule of the object to be measured can be further analyzed and obtained according to the stress and motion relation between the spring and the object to be measured.
Furthermore, the connecting shaft and the horizontal sliding block are arranged on the X-direction rotation measuring system, one end of the connecting shaft is connected with the horizontal sliding block, the other end of the connecting shaft is connected with the object to be measured, and the object to be measured, the connecting shaft and the horizontal sliding block rotate along the X axis together under the action of waves; the upper end and the lower end of the horizontal sliding block are respectively connected with a wheel shaft, two ends of the wheel shaft are respectively connected with a bearing to form a pulley, and the pulley is connected with the horizontal guide rail.
Furthermore, the connecting shaft penetrates through the stable center of the object to be measured along the x-axis direction, the connecting shaft and the object to be measured rotate together, and the rotating sensor is mounted on the connecting shaft and used for measuring the rotating motion response of the object to be measured around the x-axis.
Furthermore, the horizontal sliding block comprises an outer ring and an inner ring, the inner ring of the horizontal sliding block is connected with the connecting shaft and does rotary motion around the x-axis direction together with the connecting shaft and the object to be measured, the horizontal guide rail comprises four horizontal sub-guide rails, every two pulleys are respectively arranged at the upper end and the lower end of the outer ring of the horizontal sliding block, and the horizontal sliding block, the connecting shaft and the object to be measured do front-and-back motion along the y-axis.
Further, the bottom of the second straight rod is provided with a mooring mechanism which can move relative to the device frame and is used for installing a mooring rope and measuring mooring force.
Preferably, the mooring point can be arranged on the horizontal measuring system connecting seat, and the magnitude of the mooring force can be partially reflected by the vertical measuring system and the horizontal measuring system.
Compared with the prior art, the invention has the beneficial effects that: by arranging three sets of subsystems, the measurement of the model surging, heaving and surging is realized respectively, and the slider is skillfully matched with the guide rail, so that an object to be measured and the device frame can freely move along the corresponding track. For a model with undetermined mooring condition, the motion response under the stress and the constraint condition can be measured simultaneously by pulling and pressing the pressure sensing device. For models with determined mooring conditions, further analysis can also be performed by measuring the mooring forces and the motion and dynamic response of the model, respectively. The device has reasonable design and simple structure, and can effectively carry out three-degree-of-freedom decomposition measurement on the experimental model.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is a schematic structural diagram of a Z-direction measuring system.
Fig. 3 is a schematic structural diagram of the Y-direction measurement system.
Fig. 4 is a cross-sectional view of the horizontal slider and the horizontal guide rail.
Fig. 5 is a schematic structural diagram of the X-direction rotation measuring system.
FIG. 6 is a schematic structural diagram of embodiment 2.
Description of reference numerals: 1-device frame, 2-Z direction measuring system, 3-Y direction measuring system, 4-X direction rotation measuring system, 5-fixed guide rail, 6-vertical slide block, 7-tension pressure sensing device, 8-first straight rod, 9-vertical sub guide rail, 10-fixed seat, 11-limit baffle, 12-connecting seat, 13-horizontal guide rail, 14-horizontal slide block, 15-second straight rod, 16-wheel shaft, 17-pulley, 18-horizontal sub guide rail, 19-connecting shaft, 20-object to be measured, 21-rotation sensor, 22-displacement sensor and 23-mooring mechanism.
Detailed Description
The drawings are only for purposes of illustration and are not to be construed as limiting the invention. For a better understanding of the following embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
Example 1
As shown in fig. 1, a three-degree-of-freedom decomposition mooring structure measurement experimental device includes a device frame 1, a Z-direction measurement system 2, a Y-direction measurement system 3, and an X-direction rotation measurement system 4, wherein a water flow direction is set as a Y-axis, a direction perpendicular to a water surface is set as a Z-axis, the X-axis is perpendicular to the Y-axis and the Z-axis, and the X-axis, the Y-axis and the Z-axis form a right-hand coordinate system. The right-hand coordinate system is one of the methods for defining a rectangular coordinate system in space. The positive directions of the x, y and z axes in this coordinate system are specified as follows: and when the thumb is arranged in the positive direction of the x axis and the index finger points to the positive direction of the y axis, the direction pointed by the middle finger is the positive direction of the z axis.
In this embodiment, the object 20 to be measured is simultaneously erected on the Y-direction measuring system 3 and the X-direction rotation measuring system 4 by the connecting shaft 19, the connecting shaft 19 passes through the center of the object 20 to be measured along the X-axis direction, and the connecting shaft 19 rotates together with the object 20 to be measured. Under the action of waves, the device frame 1 and the object to be measured 20 move up and down along the z axis, and the object to be measured 20 moves back and forth along the y axis and rotates along the x axis.
Preferably, the apparatus frame 1 is extended upward with a first straight bar 8, and the Z-direction measuring system 2 is provided above the first straight bar 8. The device frame 1 extends downwards to form a second straight rod 15, and the Y-direction measuring system 3 is arranged on the second straight rod 15.
Referring to fig. 1 and 2, the Z-direction measuring system 2 includes a vertical slider 6 and a fixed guide rail 5, a first straight rod 8 is connected to the lower end of the vertical slider 6, the vertical slider 6 slides in the fixed guide rail 5, and the device frame 1 drives the object 20 to be measured to move up and down along the Z-axis under the influence of water waves.
Wherein, the upper end of the vertical slide block 6 is connected with a tension and pressure sensor device which comprises a spring and a tension and pressure sensor and is used for measuring the dynamic response of the object 20 to be measured.
Further, the fixed guide rail 5 comprises four vertical sub-guide rails 9 and a fixed seat 10, the fixed seat 10 is connected with the upper ends of the four vertical sub-guide rails 9, the four vertical sub-guide rails 9 are erected in a direction parallel to the z axis, the vertical sliding block 6 moves on the four vertical sub-guide rails 9 along the z axis, limiting baffles 11 are arranged at the lower ends of the four vertical sub-guide rails 9, the limiting baffles 11 are used for fixing the vertical sliding block 6 and the vertical sub-guide rails 9, and the vertical sliding block 6 is prevented from being separated from the vertical sub-guide rails 9.
Referring to fig. 1 and 3, the Y-direction measuring system 3 includes a connecting seat 12, a horizontal guide rail 13 and a horizontal slider 14, and the X-direction rotation measuring system 4 and the Y-direction measuring system 3 share the horizontal slider 14, so that the measuring effect can be ensured and the design of the invention is more ingenious. The horizontal sliding block 14 comprises an outer ring and an inner ring, the inner ring of the horizontal sliding block 14 is connected with the connecting shaft 19, and the horizontal sliding block 14, the connecting shaft 19 and the object 20 to be measured rotate around the x-axis direction together.
The connecting seat 12 is sleeved on the second straight rod 15, two ends of the horizontal guide rail 13 are respectively connected with the connecting seat 12, the horizontal sliding block 14 is erected on the horizontal guide rail 13, and the horizontal guide rail 13 is erected on the second straight rod 15 along the y axis. One end of the connecting shaft 19 is connected with the horizontal sliding block 14, the other end of the connecting shaft passes through the object 20 to be measured, the object 20 to be measured is connected with the horizontal sliding block 14 through the connecting shaft 19, and under the action of waves, the object 20 to be measured and the horizontal sliding block 14 move back and forth along the y axis together.
Further, a tension and pressure sensing device is installed on the connection base 12 for measuring the dynamic response of the object 20 to be measured.
As shown in fig. 4, the upper end and the lower end of the horizontal sliding block 14 are respectively connected with a wheel shaft 16, the two ends of the wheel shaft 16 are respectively connected with a bearing to form a pulley 17, and the pulley 17 is connected with the horizontal guide rail 13; the horizontal guide rail 13 includes four horizontal sub-guide rails 18, and each two pulleys 17 are respectively disposed at upper and lower ends of an outer ring of the horizontal slider 14.
As shown in fig. 5, the connecting shaft 19 is provided with a rotation sensor 21 for measuring the rotational motion response and the dynamic response of the object 20 to be measured about the x-axis.
In this embodiment, the working principles of the X-direction rotation measuring system 4, the Y-direction measuring system 3, and the Z-direction measuring system 2 are as follows:
when the rotating motion response measurement in the X direction is carried out, a first straight rod 8 extending upwards from the device frame 1 is connected with a vertical sliding block 6 of the Z-direction measuring system, and then a connecting seat 12 of the Y-direction measuring system 3 is arranged at a second straight rod 15 extending downwards from the device frame 1. The object 20 to be measured, the connecting shaft 19 and the bearing inner ring of the horizontal sliding block 14 rotate together, and the rotating sensor 21 arranged on the connecting shaft 19 measures the rotating motion response of the object 20 to be measured around the X direction.
When the motion response measurement in the Y direction is carried out, a tension and pressure sensing device 7 is installed on a Y-direction measuring system 3, the tension and pressure sensing device 7 comprises a spring and a tension and pressure sensor, the spring is connected with a horizontal sliding block 14 and a connecting seat 12, an object to be measured 20, a connecting shaft 19 and the horizontal sliding block 14 move in the Y direction along a horizontal guide rail 13 on the Y-direction measuring system 3, a pulley 17 of the horizontal sliding block 14 can be matched with a horizontal sub-guide rail 13 on the Y-direction measuring system 3, so that the object to be measured 20 and the horizontal sliding block 14 move in the Y direction along the horizontal guide rail 13 together, the constraint action of unknown conditions on the object to be measured in the Y direction is simulated through the spring in the tension and pressure sensing device 7, the stress response of the object to be measured 20 in the Y direction is realized through the tension and pressure sensor in the tension and pressure sensing device 7, and the good linear relationship exists between mooring, under the condition of known spring hooke coefficient, the dynamic and motion response of the object 20 to be measured in the Y direction under the selected spring constraint condition can be obtained through the data change of the pulling pressure sensor.
When the Z-direction movement response measurement is carried out, a tension and pressure sensing device 7 is selectively installed on a Z-direction measuring system 2, a spring of the tension and pressure sensing device is connected with a fixed seat 10 and a vertical sliding block 6, an object 20 to be measured, a connecting shaft 19, a Y-direction measuring system 3 and a device frame 1 move in the Z direction along a vertical sub-guide rail 9 on the Z-direction measuring system 2, a connecting seat of the Y-direction measuring system 3 is fixed on a second straight rod 15 extending downwards from the device frame 1, the Y-direction measuring system 3 and the device frame 1 move simultaneously, a first straight rod 8 extending upwards from the device frame 1 is connected with the vertical sliding block 6 of the Z-direction measuring system 2, a pulley 17 of the vertical sliding block 6 is matched with the vertical sub-guide rail 9, so that the object 20 to be measured, the Y-direction measuring system 3 and the device frame 1 move in the Z direction along the vertical sub-guide rail 9 together, and, preventing the vertical slider 6 from sliding out of the guide rail. The restraint effect of unknown mooring conditions on the object to be measured in the Z direction is simulated through the springs in the tension and pressure sensing device 7, the stress response of the object to be measured 20 in the Z direction is realized through the tension and pressure sensors in the tension and pressure sensing device 7, and the power and motion response of the object to be measured 20 in the Z direction under the selected spring restraint condition are measured through the data change of the tension and pressure sensors under the condition of the known spring coefficient because the springs have good linear relation between the force and the displacement.
In this embodiment, the connection socket 12 in the Y-direction measurement system 3 may be used as a mooring point, the object 20 to be measured is moored to the connection socket 12 by a cable, and the mooring force of the object 20 to be measured can be partially reflected by the change in the readings of the pull pressure sensors in the Y-direction measurement system 3 and the Z-direction measurement system 2.
Example 2
As shown in fig. 6, the difference between this embodiment 2 and embodiment 1 is that a mooring mechanism 23 is selected to be added to the second straight rod 15 extending downward from the device frame 1, the tension and pressure sensing device 7 in the device frame 1 is replaced by a displacement sensor 21, the object 20 to be measured is moored to the mooring mechanism 23 by a cable, the tension and pressure sensor on the mooring cable is used to measure the mooring force of the object 20 to be measured in the experiment, and meanwhile, the motion responses of the object 20 to be measured in three degrees of freedom corresponding to the mooring condition are obtained by the X-rotation direction measuring system 4, the Y-direction measuring system 3 and the Z-direction measuring system 2.
In this embodiment, the mooring mechanism 23 and the device frame 1 are relatively movable, so that the device frame 1 can perform Z-directional displacement relative to the fixed mooring mechanism 23.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the technical solutions of the present invention, and are not intended to limit the specific embodiments of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention claims should be included in the protection scope of the present invention claims.
Claims (10)
1. A three-degree-of-freedom decomposition mooring structure measurement experimental device is used for measuring the stress condition and motion response of an object to be measured; the device is characterized by comprising a device frame (1), a Z-direction measuring system (2), a Y-direction measuring system (3) and an X-direction rotation measuring system (4), wherein the water flow direction is set as a Y-axis, the direction vertical to the water surface is set as a Z-axis upwards, the X-axis is vertical to the Y-axis and the Z-axis, and the X-axis, the Y-axis and the Z-axis form a right-hand coordinate system; under the action of waves, the device frame (1) and the object to be measured (20) move up and down along the z axis, and the object to be measured (20) moves back and forth along the y axis and rotates along the x axis.
2. The three-degree-of-freedom decomposition mooring structure measurement experiment device according to claim 1, characterized in that the device frame (1) is provided with a first straight rod (8) in an upward extending manner, the Z-direction measurement system (2) comprises a vertical slider (6), a fixed guide rail (5) and a sensor device, the first straight rod (8) is connected with the lower end of the vertical slider (6), the sensor device is connected with the upper end of the vertical slider (6), the vertical slider (6) slides in the fixed guide rail (5), and the device frame (1) drives the object (20) to be measured to move up and down along the Z-axis under the influence of water waves.
3. The three-degree-of-freedom decomposition mooring structure measurement experiment device according to claim 2, characterized in that the fixed guide rail (5) comprises four vertical sub-guide rails (9) and a fixed seat (10), the fixed seat (10) is connected with the upper ends of the four vertical sub-guide rails (9), the four vertical sub-guide rails (9) are erected in a direction parallel to the z-axis direction, so that the vertical sliding block (6) moves on the four vertical sub-guide rails (9) along the z-axis direction, limiting baffles (11) are arranged at the lower ends of the four vertical sub-guide rails (9), and the limiting baffles (11) are used for fixing the vertical sliding block (6) and the vertical sub-guide rails (9) and avoiding the vertical sliding block (6) and the vertical sub-guide rails (9) from being separated.
4. The three-degree-of-freedom decomposition mooring structure measurement experiment device according to claim 2, characterized in that the sensor device comprises a displacement sensor (22) for measuring the motion response of the object (20) to be measured and the device frame (1) along the z-axis, or the sensor comprises a tension and pressure sensing device (7) comprising a spring and a tension and pressure sensor, the spring is respectively connected with the vertical slide block (6) and the fixed guide rail (5) for measuring the dynamic response of the object (20) to be measured.
5. The three-degree-of-freedom decomposition mooring structure measurement experiment device according to any one of claims 1 to 4, characterized in that a second straight rod (15) extends downwards from the device frame (1), the Y-direction measurement system (3) comprises a connecting seat (12), a horizontal guide rail (13) and a horizontal slider (14), the connecting seat (12) is sleeved on the second straight rod (15), two ends of the horizontal guide rail (13) are respectively connected with the connecting seat (12), the horizontal slider (14) is erected on the horizontal guide rail (13), the horizontal guide rail (13) is erected on the second straight rod (15) along a Y-axis, an object to be measured (20) is connected with the horizontal slider (14) through a connecting shaft (19), and the object to be measured (20) and the horizontal slider (14) move back and forth along the Y-axis together.
6. The three-degree-of-freedom decomposition mooring structure measurement experiment device according to claim 5, characterized in that a displacement sensor (22) is installed on the connecting seat (12) and used for measuring the motion response of the object (20) to be measured and the horizontal slider (14) along the y-axis, or a tension and pressure sensing device is installed.
7. The three-degree-of-freedom decomposition mooring structure measurement experiment device according to claim 5, characterized in that the connecting shaft (19) and the horizontal slider (14) are arranged on the X-direction rotation measurement system (4), one end of the connecting shaft (19) is connected with the horizontal slider (14), the other end of the connecting shaft (19) penetrates through the object to be measured (20), and under the action of waves, the object to be measured (20) rotates along the X-axis together with the connecting shaft (19) and the horizontal slider (14); the upper end and the lower end of the horizontal sliding block (14) are respectively connected with a wheel shaft (16), the two ends of the wheel shaft (16) are respectively connected with a bearing to form a pulley (17), and the pulley (17) is connected with the horizontal guide rail (13).
8. The three-degree-of-freedom decomposition mooring structure measurement experiment device according to claim 7, characterized in that the connecting shaft (19) passes through a stable center of the object to be measured (20) along the x-axis direction, the connecting shaft (19) rotates together with the object to be measured (20), and the connecting shaft (19) is provided with a rotation sensor (21) for measuring the rotational motion response and the dynamic response of the object to be measured (20) around the x-axis.
9. The three-degree-of-freedom decomposition mooring structure measurement experiment device according to claim 8, characterized in that the horizontal slider (14) comprises an outer ring and an inner ring, the inner ring of the horizontal slider (14) is connected with the connecting shaft (19), the horizontal slider (14), the connecting shaft (19) and the object to be measured (20) perform rotational motion around the x-axis direction, the horizontal guide rail (13) comprises four horizontal sub-guide rails (18), every two pulleys (17) are respectively arranged at the upper end and the lower end of the outer ring of the horizontal slider (14), and the horizontal slider (14), the connecting shaft (19) and the object to be measured (20) perform forward and backward motion along the y-axis.
10. The three-degree-of-freedom decomposition mooring structure measurement experiment device according to claim 5, characterized in that a mooring mechanism (23) movable relative to the device frame (1) is arranged at the bottom of the second straight rod (15) and used for mounting mooring lines and measuring mooring force.
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| CN112985762A (en) * | 2021-02-22 | 2021-06-18 | 华南理工大学 | Seaworthiness device for ship model six-degree-of-freedom motion measurement |
| CN113533043A (en) * | 2021-07-08 | 2021-10-22 | 萍乡强盛电瓷制造有限公司 | Tension detection device for disc-type suspension porcelain insulator |
| CN114343641A (en) * | 2022-01-24 | 2022-04-15 | 广州熠华教育咨询服务有限公司 | Learning difficulty intervention training guidance method and system thereof |
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