A wind tunnel test system for vortex-induced vibration measurement and pressure measurement of a cable segment model

Abstract

The present invention provides a vortex-induced vibration measurement and pressure measurement wind tunnel test system for a cable segment model, which belongs to the technical field of wind tunnel test, and includes a support frame, a wind deflection angle adjustment frame, an inclination angle adjustment frame, a plurality of pressure tube adjustment brackets, a plurality of laser displacement meters and a pressure measurement scanning valve. The wind deflection angle adjustment frame is slidably connected to the support frame and has a rotational freedom around the Z axis. The inclination angle adjustment frame is slidably connected to the wind deflection angle adjustment frame and has a sliding freedom in the horizontal plane. The inclination angle adjustment frame is used to connect the cable segment model and adjust its posture; a plurality of laser displacement meters are respectively connected to a plurality of pressure tube adjustment brackets, and the laser displacement meter is used to monitor the displacement of the cable segment model in the wind tunnel test; and the pressure measurement scanning valve is used to monitor the wind pressure around the model surface. The present invention has the technical effects of being able to flexibly adjust the posture of the cable segment model in multiple dimensions, being able to simultaneously perform vibration measurement and pressure measurement tests, having accurate test data, and high test efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of wind tunnel tests, and more specifically, relates to a wind tunnel test system for measuring vortex-induced vibration and pressure of a stayed cable segment model. Background Art

[0002] In recent years, my country's large-span cable-stayed bridges have developed rapidly, breaking world records. The number of large-span cable-stayed bridges has increased, and the scale has also increased. As an important component of cable-stayed bridges, the cable-stayed cable has also developed towards an ultra-long cable structure, and the wind load and wind-induced vibration problems of the cable-stayed cable have become more prominent. The cable-stayed cable itself has the characteristics of large aspect ratio, low stiffness and low resistance, which makes it more prone to wind-induced vibration under the action of wind.

[0003] Vortex-induced vibration of cable-stayed cables has attracted extensive attention in recent years. Through actual bridge testing, many scholars have found that long-term and high-frequency vortex-induced vibration has caused obvious fatigue damage to the cable, such as cracking of the surface PE sleeve and damage to the end sleeve. Long-term and high-frequency vibration has caused serious interference to driving and pedestrians, affecting safety. Vortex-induced vibration of cable-stayed cables has become a research hotspot.

[0004] As one of the main research methods for vortex-induced vibration and wind load problems of cable-stayed cables, the vortex-induced vibration wind tunnel test requires changing the inclination and wind deflection of the cable segment model in the wind tunnel laboratory, considering the working environment of the cable in actual engineering, so as to restore the three-dimensional flow field of the cable in actual engineering. The vortex-induced vibration of the cable mainly studies the vibration in the in-plane and out-of-plane directions (orthogonal). Therefore, when conducting the vortex-induced vibration wind tunnel test of the cable segment model, it is necessary to flexibly change the test inclination and wind deflection according to different working conditions, not only to ensure the synchronous measurement of in-plane and out-of-plane vibrations, but also to perform synchronous dynamic wind pressure measurements. These tests require a special test suspension system to ensure the normal and efficient conduct of the test.

[0005] The wind tunnel test equipment or devices used in the prior art to support the vortex-induced vibration of the cable segment model are not easy to achieve multi-dimensional directional adjustment or regulation of the cable, resulting in inaccurate measured test data; and the existing equipment or devices cannot simultaneously achieve vibration measurement and pressure measurement wind tunnel tests on the cable. Summary of the invention

[0006] The purpose of the present invention is to provide a wind tunnel test system for vortex-induced vibration measurement and pressure measurement of a cable segment model, aiming to solve the technical problems that the test equipment used in the prior art is difficult to achieve multi-dimensional directional adjustment of the cable and is difficult to perform vibration and pressure measurement tests simultaneously.

[0007] To achieve the above object, the technical solution adopted by the present invention is: to provide a wind tunnel test system for vortex-induced vibration measurement and pressure measurement of a cable segment model, comprising:

[0008] Support frame;

[0009] A windage angle adjustment frame is arranged inside the support frame, the upper end and the lower end of the windage angle adjustment frame are both slidably connected to the support frame and have a rotational freedom around the Z-axis of the three-dimensional coordinate system;

[0010] An inclination adjustment frame is arranged inside the windage angle adjustment frame, the upper end and the lower end of the inclination adjustment frame are both slidably connected to the windage angle adjustment frame and have the freedom to slide in the horizontal plane, the inclination adjustment frame itself has the freedom to telescope along the Z axis, and the inclination adjustment frame is used to connect the inclined cable segment model and adjust the posture;

[0011] A plurality of pressure measuring tube adjustment brackets, all connected to the inclination adjustment frame;

[0012] A plurality of laser displacement meters, respectively connected to the plurality of pressure tube adjustment brackets, the laser displacement meters having a degree of freedom of movement along the length direction of the pressure tube adjustment bracket, and used to monitor the displacement of the inclined cable segment model in the wind tunnel test;

[0013] The pressure scanning valve is connected to the inclined cable segment model and is used to monitor the wind pressure around the surface of the inclined cable segment model.

[0014] In a possible implementation, circular slides are connected to the top and bottom of the inner side of the support frame, the wind angle adjustment frame includes an upper frame and a lower frame, the upper end of the upper frame and the lower end of the lower frame are respectively slidably connected to two groups of circular slides, the upper end of the inclination adjustment frame is slidably connected to the bottom end of the upper frame, the lower end of the inclination adjustment frame is slidably connected to the top end of the lower frame, and the inclination adjustment frame can be upper-limited on the upper frame and / or the lower frame.

[0015] In a possible implementation, two linear slides spaced apart and arranged in parallel are provided at the bottom end of the upper frame and the top end of the lower frame, and the linear slides are located in a horizontal plane. The upper end and the lower end of the inclination adjustment frame are respectively slidably connected to a plurality of the linear slides, and the inclination adjustment frame has the freedom to slide in the horizontal plane to adjust the posture of the inclined cable segment model, and the inclination adjustment frame can be upper-limited on the linear slides.

[0016] In a possible implementation, the tilt angle adjustment framework includes:

[0017] Two groups of upper telescopic columns are both vertical and spaced apart, and both have the freedom of telescopic extension along the Z axis. The upper ends of the two groups of upper telescopic columns correspond to the two linear slideways slidably connected to the upper frame, and the two groups of upper telescopic columns telescope at the same time.

[0018] Two groups of lower telescopic columns are both vertical and spaced apart, and both have the freedom of telescopic extension along the Z axis. The lower ends of the two groups of lower telescopic columns correspond to the two linear slideways slidably connected to the lower frame, and the two groups of lower telescopic columns telescope at the same time.

[0019] Two groups of fixed components, two ends of one group of fixed components are respectively connected to the lower ends of the two upper telescopic columns, and two ends of the other group of fixed components are respectively connected to the upper ends of the two lower telescopic columns, the fixed components are connected to the upper telescopic columns or the lower telescopic columns at the connection to form a rotation connection, the two ends of the inclined cable segment model are respectively connected to the two groups of fixed components, and the spacing between the two groups of fixed components is adjusted by sliding the two groups of upper telescopic columns and / or the two groups of lower telescopic columns;

[0020] The heights of the two groups of fixed components are adjusted by controlling the extension and retraction of the two groups of upper telescopic columns and the two groups of lower telescopic columns, so as to adjust the inclination of the inclined cable segment model.

[0021] In a possible implementation, the fixing component includes:

[0022] The ends of the circular ring frame are respectively rotatably connected to the ends of the two upper telescopic columns or the lower telescopic columns;

[0023] A plurality of hook plates are evenly connected to the inner wall of the circular frame along the circumference of the circular frame, and the plurality of hook plates form a circle;

[0024] A plurality of suspension springs are arranged corresponding to the plurality of hook plates one by one, one end of which is connected to the plurality of hook plates and the other end is used to hang the end of the inclined cable segment model, and the plurality of suspension springs are arranged in a circular array.

[0025] In a possible implementation, there are four pressure measuring tube adjustment brackets, two of which are arranged on each group of the circular ring frames, one end of the pressure measuring tube adjustment bracket is fixedly connected to the outer wall of the circular ring frame, and the other end is a free end, the pressure measuring tube adjustment bracket is arranged in a rod shape and the length direction is parallel to the radial direction of the circular ring frame, the length direction of the two pressure measuring tube adjustment brackets on each group of the circular ring frames is vertically arranged, and the pressure measuring tube adjustment bracket is provided with a slide rail along its length direction, and a fixed panel is slidably connected to the slide rail, the laser displacement meter is connected to the fixed panel, and the fixed panel can be limited on the slide rail, and the laser displacement meter monitors the position by means of the sliding adjustment of the fixed panel.

[0026] In a possible implementation, a circular slide groove is formed on the side wall of the circular ring frame along its circumference, and the plurality of hook plates are slidably connected to the circular slide groove, and the position of the hook plate in the circular slide groove can be adjusted and limited.

[0027] In a possible implementation, the pressure measuring scanning valve includes a plurality of pressure measuring tubes, a scanning valve and a wind pressure data instrument. Both ends of the inclined cable segment model are open and a plurality of pressure measuring holes are evenly distributed on the surface. One ends of the plurality of pressure measuring tubes are respectively connected to the plurality of pressure measuring holes one by one, and the other ends of the plurality of pressure measuring tubes are led out from the end of the inclined cable segment model and connected to the scanning valve. The pressure measuring tubes led out from the end of the inclined cable segment model are connected with the scanning valve to form a whole and are fixed on the steel pipe inside the inclined cable segment model. The plurality of pressure measuring tubes guide the airflow on the surface of the inclined cable segment model into the scanning valve. The scanning valve is used to monitor the wind pressure around the surface of the inclined cable segment model. The wind pressure data instrument is located outside the wind tunnel laboratory and is connected to the scanning valve through the pressure measuring tube. The pressure measuring tube is connected to the pressure measuring tube adjustment bracket.

[0028] In a possible implementation, the wind angle adjustment frame is connected to a driver, a power output end of the driver is connected to the circular slide, and the driver is used to drive the wind angle adjustment frame to slide in the circular slide.

[0029] In a possible implementation, the wind angle adjustment frame is connected to an electric pusher, one end of the electric pusher is connected to the wind angle adjustment frame, and the other end is connected to the tilt angle adjustment frame, and the electric pusher is used to push the tilt angle adjustment frame to slide.

[0030] The beneficial effects of the vortex-induced vibration measurement and pressure measurement wind tunnel test system for a cable segment model provided by the present invention are as follows: compared with the prior art, the vortex-induced vibration measurement and pressure measurement wind tunnel test system for a cable segment model provided by the present invention comprises a support frame, a windage angle adjustment frame, an inclination angle adjustment frame, a plurality of pressure measuring tube adjustment brackets, a plurality of laser displacement meters and a pressure measuring scanning valve, the windage angle adjustment frame is arranged inside the support frame, the upper and lower ends of the windage angle adjustment frame are both slidably connected to the support frame and have a rotational freedom around the Z-axis direction of the three-dimensional coordinate system; the inclination angle adjustment frame is arranged inside the windage angle adjustment frame, the upper and lower ends of the inclination angle adjustment frame are both slidably connected to the windage angle adjustment frame and have a sliding freedom in a horizontal plane, and the inclination angle adjustment frame itself has a telescopic freedom along the Z-axis direction, The inclination adjustment frame is used to connect the inclined cable segment model and adjust its posture; multiple pressure tube adjustment brackets are connected to the inclination adjustment frame; multiple laser displacement meters are respectively connected to the multiple pressure tube adjustment brackets, the laser displacement meter has the freedom to move along the length direction of the pressure tube adjustment bracket, and the laser displacement meter is used to monitor the displacement of the inclined cable segment model in the wind tunnel test; the pressure scanning valve is connected to the inclined cable segment model and is used to monitor the flow field pressure, which solves the technical problems that the test equipment used in the prior art is difficult to achieve multi-dimensional directional adjustment of the inclined cable and difficult to perform vibration and pressure tests at the same time, and has the technical effects of being able to flexibly adjust the posture of the inclined cable segment model in multiple dimensions, being able to perform vibration and pressure tests at the same time, and having accurate test data and high test efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 A schematic structural diagram of a wind tunnel test system for vortex-induced vibration measurement and pressure measurement of a cable segment model provided by an embodiment of the present invention;

[0033] Figure 2 A schematic diagram of a wind tunnel test system for vortex-induced vibration measurement and pressure measurement of a stay cable segment model provided by an embodiment of the present invention in a test posture;

[0034] Figure 3 A schematic diagram of the connection structure between the lower frame and the circular slideway of a wind tunnel test system for vortex-induced vibration measurement and pressure measurement of a cable segment model provided by an embodiment of the present invention;

[0035] Figure 4A schematic diagram of the connection structure between the lower telescopic column and the fixed assembly of a wind tunnel test system for vortex-induced vibration measurement and pressure measurement of a cable segment model provided by an embodiment of the present invention;

[0036] Figure 5 A schematic diagram of the pressure measuring tube adjustment bracket structure of a vortex-induced vibration measurement and pressure measurement wind tunnel test system for a stayed cable segment model provided in an embodiment of the present invention.

[0037] Description of reference numerals:

[0038] 1. Support frame; 2. Windage angle adjustment frame; 21. Upper frame; 22. Lower frame; 23. Linear slide; 24. Slide plate; 3. Inclination angle adjustment frame; 31. Upper telescopic column; 32. Lower telescopic column; 33. Fixed assembly; 331. Ring frame; 332. Hook plate; 333. Suspension spring; 334. Circular slide; 34. Rotating part; 4. Pressure measuring tube adjustment bracket; 41. Slide rail; 42. Fixed panel; 5. Laser displacement meter; 6. Circular slide; 7. Pressure measuring tube; 8. Pressure measuring hole. DETAILED DESCRIPTION

[0039] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0040] Please also read Figures 1 to 5, a wind tunnel test system for vortex-induced vibration measurement and pressure measurement of a cable segment model provided by the present invention is now described. The wind tunnel test system for vortex-induced vibration measurement and pressure measurement of a cable segment model comprises a support frame 1, a wind angle adjustment frame 2, an inclination adjustment frame 3, a plurality of pressure measuring tube adjustment brackets 4, a plurality of laser displacement meters 5 and a pressure measuring scanning valve. The wind angle adjustment frame 2 is arranged inside the support frame 1, and the upper and lower ends of the wind angle adjustment frame 2 are both slidably connected to the support frame 1 and have a rotational freedom around the Z-axis direction of the three-dimensional coordinate system; the inclination adjustment frame 3 is arranged inside the wind angle adjustment frame 2, and the upper and lower ends of the inclination adjustment frame 3 are both slidably connected to the wind angle adjustment frame 2 and have a rotational freedom in the horizontal plane. The internal sliding freedom, the inclination adjustment frame 3 itself has the freedom of telescopic extension along the Z axis, and the inclination adjustment frame 3 is used to connect the inclined cable segment model and adjust the posture; multiple pressure measuring tube adjustment brackets 4 are connected to the inclination adjustment frame 3; multiple laser displacement meters 5 are respectively connected to multiple pressure measuring tube adjustment brackets 4, and the laser displacement meters 5 have the freedom of movement along the length direction of the pressure measuring tube adjustment bracket 4. The laser displacement meter 5 is used to monitor the displacement of the inclined cable segment model in the wind tunnel test; the pressure scanning valve is connected to the inclined cable segment model and is used to monitor the wind pressure around the surface of the inclined cable segment model. In the present invention, a Cartesian three-dimensional coordinate system is used, and the length direction of the support frame 1 is defined as the X axis, the width direction of the support frame 1 is defined as the Y axis, and the height direction of the support frame 1 is defined as the Z axis.

[0041] The present invention provides a vortex-induced vibration measurement and pressure measurement wind tunnel test system for a cable segment model. Compared with the prior art, the wind deflection angle adjustment frame 2 can be enabled to rotate in a circular direction, so that the posture of the cable can be adjusted, the inclination angle (the angle formed with the horizontal plane) of the cable can be adjusted by the inclination angle adjustment frame 3, the displacement of the cable in the wind tunnel test can be monitored by multiple laser displacement meters 5, and the flow field pressure can be monitored or measured by the pressure measurement scanning valve, thereby solving the technical problems that the test equipment used in the prior art is difficult to achieve multi-dimensional directional adjustment of the cable and difficult to perform vibration measurement and pressure measurement tests at the same time. The system has the technical effects of being able to flexibly adjust the posture of the cable segment model in multiple dimensions, being able to perform vibration measurement and pressure measurement tests at the same time, and having accurate test data and high test efficiency.

[0042] The support frame 1 is composed of a plurality of steel materials combined and spliced ​​together, and the connection between the plurality of steel materials is bolted, so that the support frame 1 is detachable. In this embodiment, the support frame 1 is in the shape of a rectangular parallelepiped, and the interior thereof is a cavity, and the wind angle adjustment frame 2 is located inside the cavity. Preferably, a plurality of running wheels (not shown in the figure) can be provided at the bottom of the support frame 1, so that the support frame 1 can be moved to different positions to conduct wind tunnel tests at different positions, so that the support frame 1 can be flexibly moved. The laser displacement meter 5 adopts the existing technology and can monitor or measure the displacement of the inclined cable or the test model. The pressure scanning valve is a pressure scanning valve in the existing technology, which can monitor the pressure of the flow field in real time, or the wind pressure acting on the inclined cable segment model. In the present invention, through the coordinated operation of the wind angle adjustment frame 2 and the inclination adjustment frame 3, the various postures and dimensions or directions of the inclined cable can be adjusted, and then the wind tunnel test can be carried out.

[0043] In some embodiments, see Figures 1 to 3 The top and bottom of the inner side of the support frame 1 are connected with circular slides 6 (in a circular shape, with a slide set at the upper end, and the depth direction of the slide extends toward the inside of the circular slide 6 along the Y-axis). The wind angle adjustment frame 2 includes an upper frame 21 and a lower frame 22. The upper end of the upper frame 21 and the lower end of the lower frame 22 are respectively slidably connected to two groups of circular slides 6. The upper end of the inclination adjustment frame 3 is slidably connected to the bottom end of the upper frame 21, and the lower end of the inclination adjustment frame 3 is slidably connected to the top of the lower frame 22. The inclination adjustment frame 3 can be limited by the upper frame 21 and / or the lower frame 22. There are two groups of circular slideways 6. The upper end of the upper frame 21 and the lower end of the lower frame 22 (preferably the lower ends of the four end angles) are connected with a slide plate 24. The lower end of the slide plate 24 is rotatably connected with a roller (the roller is placed inside the slideway to achieve rolling or sliding), and the roller is rotatably connected in the circular slideway 6, so that the upper frame 21 and the lower frame 22 can be slidably connected to the circular slideway 6. The side wall of the circular slideway 6 is provided with scale lines, so that the position or sliding stroke of the upper frame 21 or the lower frame 22 after sliding can be seen. In this embodiment, the upper frame 21 and the lower frame 22 slide at the same time, and the sliding direction is the same. The wind deflection angle of the wind tunnel test can be adjusted by sliding and limiting.

[0044] In this embodiment, the upper frame 21 and the lower frame 22 are both rectangular, aligned up and down, and in the same vertical direction.

[0045] In some embodiments, see Figures 1 to 3The bottom end of the upper frame 21 and the top end of the lower frame 22 are both provided with two linear slideways 23 spaced apart and arranged in parallel. The linear slideways 23 are located in the horizontal plane. The upper end and the lower end of the inclination adjustment frame 3 are respectively connected to the plurality of linear slideways 23 in a sliding manner. The inclination adjustment frame 3 has the freedom to slide in the horizontal plane to adjust the posture of the inclined cable segment model. The inclination adjustment frame 3 can be limited on the linear slideway 23. The inclination adjustment frame 3 slides on the linear slideway 23 to adjust the connection position of the inclined cable. Limiting blocks are provided at both ends of the linear slideway 23 to prevent the inclination adjustment frame 3 from slipping off the linear slideway 23.

[0046] In some embodiments, see Figures 1 to 4 The tilt adjustment frame 3 includes two groups of upper telescopic columns 31, two groups of lower telescopic columns 32 and two groups of fixed components 33. The two groups of upper telescopic columns 31 are both vertical and spaced apart, and both have the freedom of telescopic extension along the Z axis. The upper ends of the two groups of upper telescopic columns 31 correspond to the two linear slideways 23 slidably connected to the upper frame 21, and the two groups of upper telescopic columns 31 telescope at the same time; the two groups of lower telescopic columns 32 are both vertical and spaced apart, and both have the freedom of telescopic extension along the Z axis. The lower ends of the two groups of lower telescopic columns 32 correspond to the two linear slideways 23 slidably connected to the lower frame 22, and the two groups of lower telescopic columns 32 telescope at the same time; one fixed component The two ends of the component 33 are respectively connected to the lower ends of the two upper telescopic columns 31, and the two ends of the other set of fixed components 33 are respectively connected to the upper ends of the two lower telescopic columns 32. The fixed components 33 are connected to the upper telescopic columns 31 or the lower telescopic columns 32 at the connection to form a rotation connection. The two ends of the inclined cable segment model are respectively connected to the two sets of fixed components 33. The spacing between the two sets of fixed components 33 is adjusted by sliding the two sets of upper telescopic columns 31 and / or the two sets of lower telescopic columns 32; wherein, the height of the two sets of fixed components 33 is adjusted by controlling the extension and contraction of the two sets of upper telescopic columns 31 and the two sets of lower telescopic columns 32 to adjust the inclination of the inclined cable segment model. In this embodiment, the lower ends of the two upper telescopic columns 31 and the upper ends of the two lower telescopic columns 32 are connected with a rotating component 34. The rotating component 34 can be a structural component with rotational freedom such as a bearing component and a rotating disk. After being connected to the upper telescopic column 31 (lower telescopic column 32) and the fixed component 33, the relative rotational movement of the two can be realized.

[0047] In this embodiment, the upper telescopic column 31 and the lower telescopic column 32 are both telescopic columns, which are composed of multiple sections of mutually telescopically plugged columns. By adjusting the length of the upper telescopic column 31 or the lower telescopic column 32, the inclination angle of the inclined cable (the angle between the axial direction of the inclined cable and the horizontal plane) can be adjusted to simulate the use state of the inclined cable in actual applications. The inclination angle of the inclined cable can be adjusted by adjusting the upper telescopic column 31 and the lower telescopic column 32 themselves and sliding on the linear slide 23. When the upper telescopic column 31 and the lower telescopic column 32 are extended and retracted, the fixing assembly 33 can rotate around the connection with the upper telescopic column 31 and the lower telescopic column 32, so that the adjustment angle of the inclined cable can be guaranteed.

[0048] Preferably, the upper telescopic column 31 and the lower telescopic column 32 can adopt the electric telescopic rod in the prior art, and the inclination angle of the inclined cable can be automatically adjusted by control. The present invention also includes a control panel, which is electrically connected to the upper telescopic column 31 and the lower telescopic column 32 and controls the operation respectively.

[0049] In some embodiments, see Figure 1 , Figure 2 and Figure 4 The fixing assembly 33 includes a circular frame 331, a plurality of hook plates 332 and a plurality of suspension springs 333. The ends of the circular frame 331 are respectively connected to the ends of the two upper telescopic columns 31 or the lower telescopic columns 32 by rotation; the plurality of hook plates 332 are evenly connected to the inner wall of the circular frame 331 along the circumference of the circular frame 331, and the plurality of hook plates 332 are arranged in a circle; the plurality of suspension springs 333 are arranged one by one with the plurality of hook plates 332, one end of which is connected to the plurality of hook plates 332, and the other end is used to hang the end of the inclined cable segment model, and the plurality of suspension springs 333 are arranged in an annular array. The circular frame 331 is in the shape of a circular ring. When it is arranged in a vertical shape, the left and right ends of the circular frame 331 are both connected to the two upper telescopic columns 31 or the two lower telescopic columns 32 by rotation. The axial direction of the circular frame 331 is always coaxial with the axial direction of the inclined cable. One end of the suspension spring 333 is connected to the inclined cable segment model, so that the inclined cable segment model can be fixed, and the inclined cable segment model is not in contact with the laser displacement meter 5.

[0050] Specifically, the suspension spring 333 is a spring, one end of which can be hung on the end of the inclined cable and the other end of which can be hung in the through hole on the hook plate 332.

[0051] In some embodiments, see Figure 1 , Figure 2 and Figure 5There are four piezometric tube adjustment brackets 4, and two piezometric tube adjustment brackets 4 are arranged on each group of circular ring frames 331. One end of the piezometric tube adjustment bracket 4 is fixedly connected to the outer wall of the circular ring frame 331, and the other end is a free end. The piezometric tube adjustment bracket 4 is arranged in a rod shape and its length direction is parallel to the radial direction of the circular ring frame 331. The length direction of the two piezometric tube adjustment brackets 4 on each group of circular ring frames 331 is arranged vertically. A slide rail 41 is arranged on the piezometric tube adjustment bracket 4 along its length direction. A fixed panel 42 is slidably connected to the slide rail 41. The laser displacement meter 5 is connected to the fixed panel 42. The fixed panel 42 can be limited on the slide rail 41. The laser displacement meter 5 adjusts the monitoring position with the help of the sliding of the fixed panel 42. By setting the fixed panel 42, the monitoring position of the laser displacement meter 5 can be adjusted, so that the movement amount of the inclined cable at different positions can be measured. It should be noted that the piezometric tube adjustment bracket 4 is located on the outer wall of the circular ring frame 331 and does not contact the inclined cable segment model. By setting two laser displacement meters 5 that move in perpendicular directions, the Y-axis movement and the Z-axis movement of the inclined cable can be monitored or measured, and the movement of the inclined cable in various radial directions can be measured. When the position of the laser displacement meter 5 is adjusted, the fixed panel 42 can be locked on the slide rail 41, that is, the position of the laser displacement meter 5 is fixed. There are also four laser displacement meters 5, which are correspondingly set on the four pressure measuring tube adjustment brackets 4.

[0052] In some embodiments, see Figure 4 The side wall of the circular frame 331 is formed with a circular groove 334 along its circumference, and a plurality of hook plates 332 are slidably connected to the circular groove 334. The position of the hook plate 332 in the circular groove 334 can be adjusted and limited. The circular groove 334 can provide the hook plate 332 with 360° rotation to adjust the hooking position of the suspension spring 333 and the inclined cable segment model.

[0053] In this embodiment, if the connection position between the suspension spring 333 and the inclined cable segment model is to be adjusted, the hook plate 332 can be slid in the circular slide 334 to adjust the position of the hook plate 332, thereby adjusting the position of the suspension spring 333 relative to the inclined cable. The position of the hook plate 332 in this embodiment after sliding in the circular slide 6 can be locked, so that the connection position between the suspension spring 333 and the inclined cable can be adjusted, which is conducive to fixing the inclined cable. In this embodiment, there are four hook plates 332 and four suspension springs 333, which are arranged in a cross shape.

[0054] In some embodiments, the pressure scanning valve includes a plurality of pressure measuring tubes 7, a scanning valve and a wind pressure data instrument (not shown in the figure). Both ends of the inclined cable segment model are open and the surface is uniformly provided with a plurality of pressure measuring holes 8. One end of the plurality of pressure measuring tubes 7 is respectively connected to the plurality of pressure measuring holes 8 in a one-to-one correspondence. The other end of the plurality of pressure measuring tubes 7 is led out from the end of the inclined cable segment model and connected to the scanning valve. The pressure measuring tubes 7 led out from the end of the inclined cable segment model are connected to the scanning valve to form a whole and are fixed on the steel pipe inside the inclined cable segment model. The plurality of pressure measuring tubes 7 guide the airflow on the surface of the inclined cable segment model into the scanning valve. The scanning valve is used to monitor the wind pressure around the surface of the inclined cable segment model. The wind pressure data instrument is located outside the wind tunnel laboratory and is connected to the scanning valve through the pressure measuring tube 7. The pressure measuring tube 7 is connected to the pressure measuring tube adjustment bracket 4. The wind pressure data instrument is a wind pressure meter in the prior art, which can monitor the size of the wind pressure around the flow. The pressure measuring tube 7 is set to avoid the laser displacement meter 5. The pressure measuring tube 7 is a prior art, connected to the scanning valve, and can measure the size of the wind pressure of the flow around the cable segment model. The pressure measuring tube 7 can be fixed in the groove of the pressure measuring tube adjustment bracket 4 (a structure provided on the pressure measuring tube adjustment bracket 4, used to accommodate part of the pressure measuring tube 7, and play a role in sorting and fixing). The method for monitoring wind pressure in this embodiment can also adopt the prior art.

[0055] In some embodiments, the wind angle adjustment frame 2 is connected to a driver (not shown in the figure), and the power output end of the driver is connected to the circular slide 6. The driver is used to drive the wind angle adjustment frame 2 to slide in the circular slide 6. The driver is two and both are one type of motors, one end of which is connected to the upper frame 21 and the lower frame 22, and the power output end is connected to the circular slide 6. By rotating, the upper frame 21 and the lower frame 22 can be driven to slide in the circular slide 6, thereby realizing automatic control and improving the automation level of the wind tunnel test.

[0056] In some embodiments, the windage angle adjustment frame 2 is connected to an electric pusher (not shown in the figure), one end of the electric pusher is connected to the windage angle adjustment frame 2, and the other end is connected to the tilt angle adjustment frame 3, and the electric pusher is used to push the tilt angle adjustment frame 3 to slide. The electric pusher is also a prior art, specifically an electric telescopic push rod, which can push the tilt angle adjustment frame 3 (upper telescopic column 31 and lower telescopic column 32) to move through telescoping, thereby realizing the electric adjustment of the inclination of the inclined cable.

[0057] The beneficial effects of the present invention mainly include:

[0058] 1) The circular slide 6 can realize 360° rotation of the wind angle adjustment frame 2 in the horizontal plane, thereby realizing flexible adjustment of the wind angle adjustment frame 2 and flexible change of the wind attack angle.

[0059] 2) Through the horizontal sliding of the inclination adjustment frame 3 and its own expansion and contraction along the Z axis, the inclination of the cable can be adjusted, and the inclination angle can be flexibly adjusted from 0 to 80°, or even to 90°, to meet the inclination angle of any cable segment model wind tunnel test.

[0060] 3) The position of the hook plate 332 on the circular frame 331 can be adjusted arbitrarily, and can also be removed from the circular frame 331, so as to facilitate the connection and installation and fixation of the inclined cables in different positions or postures.

[0061] 4) The present invention can realize the synchronous test of pressure measurement and vibration measurement of the inclined cable, thereby improving the test efficiency.

[0062] 5) In the present invention, a 1.8-2.0 m long cable segment model is used, and the length of the wind angle adjustment frame 2 is 2078 mm, ensuring the angle adjustment of the longest 2 m cable segment model, wherein the length of the cable segment model can be reasonably selected according to actual conditions.

[0063] 6) By setting up a driver and an electric ejector, the automatic adjustment of the wind tunnel test is realized, and the automation level of the test is improved.

[0064] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A wind tunnel test system for vortex-induced vibration measurement and pressure measurement of a cable segment model, characterized in that: include: Support frame; A windage angle adjustment frame is arranged inside the support frame, the upper end and the lower end of the windage angle adjustment frame are both slidably connected to the support frame and have a rotational freedom around the Z-axis of the three-dimensional coordinate system; An inclination adjustment frame is arranged inside the windage angle adjustment frame, the upper end and the lower end of the inclination adjustment frame are both slidably connected to the windage angle adjustment frame and have the freedom to slide in the horizontal plane, the inclination adjustment frame itself has the freedom to telescope along the Z axis, and the inclination adjustment frame is used to connect the inclined cable segment model and adjust the posture; A plurality of pressure measuring tube adjustment brackets, all connected to the inclination adjustment frame; A plurality of laser displacement meters, respectively connected to the plurality of pressure tube adjustment brackets, the laser displacement meters having a degree of freedom of movement along the length direction of the pressure tube adjustment bracket, and used to monitor the displacement of the inclined cable segment model in the wind tunnel test; A pressure scanning valve is connected to the cable segment model to monitor the wind pressure around the cable segment model surface; The top and bottom of the inner side of the support frame are connected to circular slides, the wind angle adjustment frame includes an upper frame and a lower frame, the upper end of the upper frame and the lower end of the lower frame are respectively slidably connected to two groups of circular slides, the upper end of the inclination adjustment frame is slidably connected to the bottom end of the upper frame, the lower end of the inclination adjustment frame is slidably connected to the top end of the lower frame, and the inclination adjustment frame can be upper-limited on the upper frame and / or the lower frame.

2. A wind tunnel test system for vortex-induced vibration measurement and pressure measurement of a cable segment model according to claim 1, characterized in that: The bottom end of the upper frame and the top end of the lower frame are each provided with two linear slides spaced apart and arranged in parallel, the linear slides are located in a horizontal plane, the upper end and the lower end of the inclination adjustment frame are respectively slidably connected to a plurality of the linear slides, the inclination adjustment frame has the freedom to slide in a horizontal plane to adjust the posture of the inclined cable segment model, and the inclination adjustment frame can be upper-limited on the linear slides.

3. A wind tunnel test system for vortex-induced vibration measurement and pressure measurement of a cable segment model according to claim 2, characterized in that: The tilt adjustment frame comprises: Two groups of upper telescopic columns are both vertical and spaced apart, and both have the freedom of telescopic extension along the Z axis. The upper ends of the two groups of upper telescopic columns correspond to the two linear slideways slidably connected to the upper frame, and the two groups of upper telescopic columns telescope at the same time. Two groups of lower telescopic columns are both vertical and spaced apart, and both have the freedom of telescopic extension along the Z axis. The lower ends of the two groups of lower telescopic columns correspond to the two linear slideways slidably connected to the lower frame, and the two groups of lower telescopic columns telescope at the same time. Two groups of fixed components, two ends of one group of fixed components are respectively connected to the lower ends of the two upper telescopic columns, and two ends of the other group of fixed components are respectively connected to the upper ends of the two lower telescopic columns, the fixed components are connected to the upper telescopic columns or the lower telescopic columns at the connection to form a rotation connection, the two ends of the inclined cable segment model are respectively connected to the two groups of fixed components, and the spacing between the two groups of fixed components is adjusted by sliding the two groups of upper telescopic columns and / or the two groups of lower telescopic columns; The heights of the two groups of fixed components are adjusted by controlling the extension and retraction of the two groups of upper telescopic columns and the two groups of lower telescopic columns, so as to adjust the inclination of the inclined cable segment model.

4. A wind tunnel test system for vortex-induced vibration measurement and pressure measurement of a cable segment model according to claim 3, characterized in that: The fixing assembly comprises: The ends of the circular ring frame are respectively rotatably connected to the ends of the two upper telescopic columns or the lower telescopic columns; A plurality of hook plates are evenly connected to the inner wall of the circular frame along the circumference of the circular frame, and the plurality of hook plates form a circle; A plurality of suspension springs are arranged one by one corresponding to the plurality of hook plates, one end of which is connected to the plurality of hook plates and the other end is used to hang the end of the inclined cable segment model. The plurality of suspension springs are arranged in a circular array.

5. A wind tunnel test system for vortex-induced vibration measurement and pressure measurement of a cable segment model according to claim 4, characterized in that: There are four pressure measuring tube adjustment brackets, two of which are arranged on each group of the circular ring frames, one end of the pressure measuring tube adjustment bracket is fixedly connected to the outer wall of the circular ring frame, and the other end is a free end, the pressure measuring tube adjustment bracket is arranged in a rod shape and the length direction is parallel to the radial direction of the circular ring frame, the length direction of the two pressure measuring tube adjustment brackets on each group of the circular ring frames is vertically arranged, the pressure measuring tube adjustment bracket is provided with a slide rail along its length direction, a fixed panel is slidably connected to the slide rail, the laser displacement meter is connected to the fixed panel, the fixed panel can be limited on the slide rail, and the laser displacement meter monitors the position by means of the sliding adjustment of the fixed panel.

6. A wind tunnel test system for vortex-induced vibration measurement and pressure measurement of a cable segment model according to claim 4, characterized in that: The side wall of the circular ring frame is formed with a circular slide groove along its circumference, and the plurality of hook plates are slidably connected to the circular slide groove, and the position of the hook plate in the circular slide groove can be adjusted and limited.

7. A wind tunnel test system for vortex-induced vibration measurement and pressure measurement of a cable segment model according to claim 1, characterized in that: The pressure measuring scanning valve includes a plurality of pressure measuring tubes, a scanning valve and a wind pressure data instrument. Both ends of the inclined cable segment model are open and a plurality of pressure measuring holes are evenly distributed on the surface. One ends of the plurality of pressure measuring tubes are respectively connected to the plurality of pressure measuring holes one by one, and the other ends of the plurality of pressure measuring tubes are led out from the end of the inclined cable segment model and connected to the scanning valve. The pressure measuring tubes led out from the end of the inclined cable segment model are connected with the scanning valve to form a whole and are fixed on the steel pipe inside the inclined cable segment model. The plurality of pressure measuring tubes guide the airflow on the surface of the inclined cable segment model into the scanning valve; the scanning valve is used to monitor the wind pressure around the surface of the inclined cable segment model. The wind pressure data instrument is located outside the wind tunnel laboratory and is connected to the scanning valve through the pressure measuring tube. The pressure measuring tube is connected to the pressure measuring tube adjustment bracket.

8. A wind tunnel test system for vortex-induced vibration measurement and pressure measurement of a cable segment model according to claim 1, characterized in that: The wind deflection angle adjustment frame is connected to a driver, a power output end of the driver is connected to the circular slide, and the driver is used to drive the wind deflection angle adjustment frame to slide in the circular slide.

9. A wind tunnel test system for vortex-induced vibration measurement and pressure measurement of a cable segment model according to claim 1, characterized in that: The wind deflection angle adjustment frame is connected to an electric pusher, one end of the electric pusher is connected to the wind deflection angle adjustment frame, and the other end is connected to the inclination angle adjustment frame. The electric pusher is used to push the inclination angle adjustment frame to slide.

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