Non-contact floating tunnel model dynamic response and wake flow field combined measurement method

Abstract

The invention discloses a non-contact floating tunnel model dynamic response and wake flow field combined measurement method. The method comprises the following steps: constructing a floating tunnel pipe section model; a plurality of visual identification mark points are arranged on the outer surface of the model, a binocular stereoscopic vision system is arranged outside the test environment, and the translation displacement, the rotation angle and the anchor cable dynamic tension of the model are obtained and serve as dynamic response information; arranging a particle image velocity measurement system and a wave height measurement device in a flow field area around the model, and obtaining a velocity vector field of a wake flow area of the model and wave surface elevation information before and after the model as wake flow field information; time synchronization setting is carried out on the binocular stereo vision system, the particle image velocity measurement system and the wave height measurement device, and dynamic response information and wake flow field information are located in the same space-time coordinate system; and carrying out a loading test under the action of waves, ocean currents or coupling thereof, and synchronously collecting and recording dynamic response information and wake flow field information of the pipe section model. The method has high universality and adaptability.

Description

Technical Field

[0001] This invention relates to the field of hydrodynamic testing and marine engineering structure testing technology, and in particular to a method for joint measurement of dynamic response and wake field of a non-contact suspended tunnel model. Background Technology

[0002] Anchored suspended tunnels, as a novel type of cross-sea transportation structure, show significant application prospects in engineering scenarios such as deep-water strait crossings and island connections. Due to their long-term exposure to complex marine environments, these structures exhibit significant dynamic responses under environmental loads such as waves and ocean currents, accompanied by complex wake field evolution processes. The dynamic response characteristics of suspended tunnel structures and their coupling relationship with the surrounding flow field are key issues in structural safety assessment and optimization design.

[0003] Currently, the measurement of structural dynamic response in hydrodynamic model tests primarily employs contact measurement methods such as accelerometers, displacement sensors, or strain gauges. However, these methods typically require the placement of sensors or the extension of wires on the model surface, which not only interferes with the flow state on the model surface but may also alter the dynamic characteristics of the structure, especially in small-scale model tests. Furthermore, contact measurements struggle to simultaneously acquire multi-degree-of-freedom motion information of the structure. Additionally, the dynamic tension of the mooring system is difficult to measure.

[0004] For truncated model tests of moored suspended tunnels, the models typically need to be adjusted to simulate different prototype working conditions by adjusting parameters such as the buoyancy ratio and mooring angle. However, in existing tests, the measurement of structural dynamic response largely relies on contact sensors. The arrangement of these sensors and their leads is easily affected by adjustments to the model parameters, which not only increases the complexity of the test setup but also adversely affects the stability and consistency of the measurement results when the model's buoyancy ratio or mooring geometry changes.

[0005] In terms of flow field measurement, particle image velocimetry (PIV) technology has been widely used in the study of flow around and wake structures. However, in existing experiments, flow field measurement and structural motion measurement are often independent of each other, lacking a unified time series and coordinate system, making it difficult to achieve synchronous acquisition and comparative analysis of structural dynamic response and wake field evolution.

[0006] Therefore, the existing technologies generally have the following shortcomings: First, the measurement data of the structural dynamic system is not comprehensive and cannot meet the requirements of the overall structural response and the coupling analysis of each component; second, the measurement of structural dynamic response and wake field are mostly carried out separately and are difficult to synchronize; third, contact measurement methods are prone to interfering with the model motion and flow field and are difficult to adjust structural parameters; fourth, there is a lack of a measurement method suitable for suspended tunnel model tests that can acquire structural dynamic response and wake field information in the same test system without contact. Summary of the Invention

[0007] To address the technical problems existing in the prior art, this invention proposes a non-contact method for joint measurement of the dynamic response and wake field of a suspended tunnel model. By synchronizing the time and unifying the coordinates of a binocular stereo vision system, a particle image velocimetry system, and a wave height measurement device, the structural motion information and the flow field information are placed in the same spatiotemporal coordinate system. This provides a joint measurement method with a clear measurement process, flexible layout, and adaptability to different test conditions for experimental research on the dynamic characteristics of suspended tunnel segments and their interaction with the wake field.

[0008] To achieve the above objectives, this invention provides a method for joint measurement of the dynamic response and wake field of a non-contact suspended tunnel model, comprising:

[0009] A suspended tunnel segment model is constructed, which includes a pipe body, an anchoring system, and a bottom support structure. The pipe body is used to adjust the buoyancy ratio, the anchoring system is used to adjust the natural frequency of the model, and the bottom support structure is used to adjust the connection angle of the anchoring system.

[0010] Several visual recognition markers are set on the outer surface of the suspended tunnel segment model, and a binocular stereo vision system is set up outside the test environment. Using the binocular stereo vision system, the translational displacement, rotation angle and anchor cable dynamic tension of the segment model are obtained through image acquisition and spatial coordinate reconstruction, as dynamic response information.

[0011] A particle image velocimetry system and a wave height measurement device are arranged in the flow field region around the pipe segment model to synchronously acquire the velocity vector field of the wake region of the model and the wave surface elevation information before and after the model, as wake field information;

[0012] The binocular stereo vision system, the particle image velocimetry system, and the wave height measurement device are time-synchronized to place the dynamic response information and the wake field information in the same spatiotemporal coordinate system.

[0013] Loading tests were conducted under the influence of waves, ocean currents, or their coupling effects, and the dynamic response information and wake field information of the pipe section model were collected and recorded simultaneously.

[0014] Preferably, the tube is made of a rigid, light-transmitting material, and detachable counterweight components are provided on both sides inside the tube. By changing the mass of the counterweight, the buoyancy ratio of the model can be adjusted without changing the shape of the model.

[0015] The mooring system includes flexible connecting cables and elastic elements;

[0016] The bottom support structure is a steel plate, and the steel plate is provided with several adjustable connecting mechanisms for adjusting the connection angle of the mooring system.

[0017] Preferably, a plurality of visual recognition markers are provided, including:

[0018] The first marker point is located at the center of the pipe body, the second marker point is located at a set distance from the center of the pipe body, the third marker point is located on the left anchor cable connecting ring of the pipe body, and the fourth marker point is located on the right anchor cable connecting ring of the pipe body.

[0019] Preferably, the binocular stereo vision system includes two high-resolution camera devices whose spatial position relationship has been calibrated, and reconstructs the three-dimensional motion trajectory of the marker points through the principle of parallax and image matching algorithm.

[0020] Preferably, the translational displacement of the pipe segment model is determined by the displacement array of the first marker points; the rotation angle of the pipe body is determined by the angle formed by the displacements of the first marker point and the second marker point; and the dynamic tension of the anchor cable is obtained by calculating the change in anchor cable length caused by the displacement of the third marker point and / or the fourth marker point using Hooke's law.

[0021] Preferably, the dynamic response information of the suspended tunnel segment model includes:

[0022] ;

[0023] In the formula, Spring stiffness, expressed in N / m; This is the initial length of the anchor cable, in meters (m). This represents the change in length of the left anchor cable, in meters. This represents the change in length of the right-side anchor cable, in meters. This is the horizontal distance between the anchor cable connecting ring and the bottom connection, in meters. This is the vertical distance between the anchor cable connecting ring and the bottom connection, in meters (m). The horizontal displacement of the central circular sticker is expressed in meters (m). The vertical displacement of the central circular sticker is measured in meters (m). The horizontal displacement of the side five-pointed star sticker is shown in meters. The vertical displacement of the side five-pointed star sticker is shown in meters. This represents the horizontal displacement of the left anchor cable connection ring, in meters (m). This represents the vertical displacement of the left anchor cable connection ring, in meters (m). This represents the horizontal displacement of the right anchor cable connection ring, in meters (m). This represents the vertical displacement of the right anchor cable connection ring; This represents the horizontal displacement of the pipe, in meters (m). This represents the vertical displacement of the pipe, expressed in meters (m). The angle of twist of the pipe body is expressed in degrees (°). This represents the dynamic tension of the left anchor cable, in N. This represents the dynamic tension of the right-side anchor cable, expressed in N.

[0024] Preferably, the particle image velocimetry system includes a high-speed camera, a continuous laser for forming a sheet light source, and tracer particles added to the fluid, wherein the tracer particles are hollow glass microspheres; the wave height measurement device is a wave height meter arranged at preset positions before and after the suspended tunnel section model.

[0025] Preferably, the time synchronization settings for the binocular stereo vision system, the particle image velocimetry system, and the wave height measurement device include:

[0026] Based on the PCI data acquisition card and its expansion program, a pulse generator is used to synchronously trigger the binocular stereo vision system and the particle image velocimetry system to acquire data, and the data of the wave height measurement device is synchronously recorded through the data acquisition card.

[0027] Preferably, the loading test is conducted under the influence of waves, ocean currents, or their coupling, including:

[0028] S1. Record the initial position of the suspended tunnel segment model in still water;

[0029] S2. Generate waves and / or uniform flow, and start synchronously collecting wave surface changes after the flow field stabilizes;

[0030] S3. Use the processing program of the binocular stereo vision system to verify whether the model motion is two-dimensional planar motion;

[0031] S4. Stop generating waves and / or uniform flow, and wait for the water surface to return to stillness;

[0032] S5. Repeat steps S2~S4 to start the next working condition.

[0033] Compared with the prior art, the present invention has the following advantages and technical effects:

[0034] (1) The present invention measures the translation, rotation and dynamic tension of the tube body and the anchor cable in terms of structural response, and measures the front and rear wave surface elevation and wake velocity field of the model in terms of flow field information, thus achieving full coverage of detailed structural-flow field dynamic information;

[0035] (2) The present invention uses a non-contact measurement method to obtain the dynamic response information of the suspended tunnel segment model, which avoids the interference of sensors and wires on the model motion and the surrounding flow field, and improves the authenticity of the test results;

[0036] (3) By integrating dynamic response measurement and wake field measurement into the same test system, this invention achieves the synchronous acquisition of structural motion and flow field evolution, which is beneficial for studying the coupling relationship between structure and flow field;

[0037] (4) This invention is applicable to different wave, ocean current and their coupling conditions, and has strong versatility and adaptability. It can provide a reliable measurement method for hydrodynamic tests of suspended tunnels and similar marine engineering structures. Attached Figure Description

[0038] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0039] Figure 1 This is a schematic diagram of four visual recognition markers set on the outer surface of the suspended tunnel segment model in an embodiment of the present invention;

[0040] Figure 2 This is a schematic diagram of the response of a suspended tunnel segment model according to an embodiment of the present invention;

[0041] Figure 3 This is a schematic diagram of the wave height meter arrangement according to an embodiment of the present invention;

[0042] Figure 4 This is a schematic diagram of a particle image velocimetry system according to an embodiment of the present invention;

[0043] Figure 5 This is a schematic diagram of a binocular stereo vision system according to an embodiment of the present invention. Detailed Implementation

[0044] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0045] It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowchart, in some cases the steps shown or described may be executed in a different order than that shown here.

[0046] This embodiment proposes a method for joint measurement of the dynamic response and wake field of a non-contact suspended tunnel model, including:

[0047] A suspended tunnel segment model is constructed, which includes a pipe body, an anchoring system, and a bottom support structure. The pipe body is used to adjust the buoyancy ratio, the anchoring system is used to adjust the natural frequency of the model, and the bottom support structure is used to adjust the connection angle of the anchoring system.

[0048] Several visual recognition markers are set on the outer surface of the suspended tunnel segment model, and a binocular stereo vision system is set up outside the test environment. Using the binocular stereo vision system, the translational displacement, rotation angle and anchor cable dynamic tension of the segment model are obtained through image acquisition and spatial coordinate reconstruction, as dynamic response information.

[0049] A particle image velocimetry system and a wave height measurement device are arranged in the flow field region around the pipe segment model to synchronously acquire the velocity vector field of the wake region of the model and the wave surface elevation information before and after the model, as wake field information;

[0050] The binocular stereo vision system, the particle image velocimetry system, and the wave height measurement device are time-synchronized to place the dynamic response information and the wake field information in the same spatiotemporal coordinate system.

[0051] Loading tests were conducted under the influence of waves, ocean currents, or their coupling effects, and the dynamic response information and wake field information of the pipe section model were collected and recorded simultaneously.

[0052] This embodiment constructs a test system for a suspended tunnel segment model suitable for joint measurement. By combining non-contact visual measurement technology and flow field measurement technology, it achieves the synchronous acquisition of multi-degree-of-freedom dynamic response (translation, rotation, and anchor cable dynamic tension) and surrounding wake field information (front and rear wave surface elevation and wake velocity vector field) of the suspended tunnel segment model under wave, ocean current, and their coupling effects without direct contact with the model and mooring system. This avoids interference from contact sensors and their arrangement on the model's motion state and local flow field.

[0053] Furthermore, the tube is made of rigid, light-transmitting material, and detachable counterweight components are provided on both sides inside the tube. By changing the mass of the counterweight, the buoyancy ratio of the model can be adjusted without changing the shape of the model.

[0054] The mooring system includes flexible connecting cables and elastic elements;

[0055] The bottom support structure is a steel plate, and the steel plate is provided with several adjustable connecting mechanisms for adjusting the connection angle of the mooring system.

[0056] Specifically, a suspended tunnel segment model for joint measurement is constructed, comprising a tube body, an anchoring system, and a bottom support structure. The tube body is made of a material with good rigidity and light transmission properties. Removable counterweight components are installed on both sides inside the tube body. By changing the mass of the counterweights, the buoyancy ratio of the model can be adjusted without altering its shape, thereby meeting the measurement requirements under different experimental conditions.

[0057] The mooring system includes flexible connecting cables and elastic elements, allowing for adjustment of the model's natural frequency.

[0058] The bottom support structure is made of thin steel plate and is equipped with multiple adjustable connection mechanisms, allowing the connection angle between the mooring system and the suspended tunnel segment model to be adjusted according to experimental needs to simulate different mooring angle conditions. The adjustment processes for the buoyancy ratio and mooring angle are all completed without deploying any contact sensors, thus ensuring that subsequent dynamic response measurements and wake field measurements are unaffected by structural parameter adjustments.

[0059] Furthermore, several visual recognition markers are set, including:

[0060] The first marker point is located at the center of the pipe body, the second marker point is located at a set distance from the center of the pipe body, the third marker point is located on the left anchor cable connecting ring of the pipe body, and the fourth marker point is located on the right anchor cable connecting ring of the pipe body.

[0061] Specifically, such as Figure 1 The dynamic response non-contact measurement system is set up with 4 visual recognition markers on the outer surface of the suspended tunnel segment model. The markers are respectively located at (1) the center of the tube body, (2) a distance d from the center of the tube body. s (3) Anchor cable connecting ring on the left side of the pipe body, (4) Anchor cable connecting ring on the right side of the pipe body. The translation, rotation and dynamic tension of the anchor cable were measured using a binocular stereo vision (BSV) system.

[0062] Furthermore, such as Figure 5 The binocular stereo vision system includes two high-resolution camera devices whose spatial position relationship has been calibrated, and reconstructs the three-dimensional motion trajectory of the marked points through the parallax principle and image matching algorithm.

[0063] Specifically, a binocular stereo vision (BSV) system was used to measure the translational and rotational motion of the pipe body and the dynamic tension of the anchor cables. Two high-resolution cameras were placed outside the test tank to form a binocular vision measurement system. Based on the parallax principle, the corresponding points of the images were obtained using the cross-correlation method to reconstruct the three-dimensional coordinates of the target object. The motion images of the model were acquired synchronously from different perspectives. The camera equipment was spatially calibrated before the experiment to establish a unified three-dimensional coordinate system.

[0064] The binocular stereo vision system identifies the specific position of the measurement point in the image by grayscale features, thereby determining the displacement change. By determining the position of the measurement point in each photo, the displacement arrays (x1, y1) of the circular sticker, (x2, y2) of the five-pointed star sticker, and (x3, y3) and (x4, y4) of the left and right anchor cable connecting rings can be obtained.

[0065] Furthermore, the translational displacement of the pipe segment model is determined by the displacement array of the first marker points; the rotation angle of the pipe body is determined by the angle formed by the displacements of the first marker point and the second marker point; the dynamic tension of the anchor cable is obtained by calculating the change in anchor cable length caused by the displacement of the third marker point and / or the fourth marker point using Hooke's law.

[0066] Specifically, the translational motion S of the tube body is consistent with the displacement array (x1, y1), the torsion of the tube body is determined by the angle formed by the displacements of the two measuring points, and the dynamic tension of the anchor cable is calculated using Hooke's law.

[0067] Furthermore, such as Figure 2 The dynamic response information of the suspended tunnel segment model includes:

[0068] ;

[0069] In the formula, Spring stiffness, expressed in N / m; This is the initial length of the anchor cable, in meters (m). This represents the change in length of the left anchor cable, in meters. This represents the change in length of the right-side anchor cable, in meters. This is the horizontal distance between the anchor cable connecting ring and the bottom connection, in meters. This is the vertical distance between the anchor cable connecting ring and the bottom connection, in meters (m). The horizontal displacement of the central circular sticker is expressed in meters (m). The vertical displacement of the central circular sticker is measured in meters (m). The horizontal displacement of the side five-pointed star sticker is shown in meters. The vertical displacement of the side five-pointed star sticker is shown in meters. This represents the horizontal displacement of the left anchor cable connection ring, in meters (m). This represents the vertical displacement of the left anchor cable connection ring, in meters (m). This represents the horizontal displacement of the right anchor cable connection ring, in meters (m). This represents the vertical displacement of the right anchor cable connection ring; This represents the horizontal displacement of the pipe, in meters (m). This represents the vertical displacement of the pipe, expressed in meters (m). The angle of twist of the pipe body is expressed in degrees (°). This represents the dynamic tension of the left anchor cable, in N. This represents the dynamic tension of the right-side anchor cable, expressed in N.

[0070] The camera's sampling frequency is 22Hz, and the image spatial resolution is 4096×3000 pixels. This embodiment uses a three-step calibration algorithm based on diagonal length to ensure that the relative error of displacement recognition is within 0.27%.

[0071] Furthermore, the particle image velocimetry system includes a high-speed camera, a continuous laser for forming a sheet light source, and tracer particles added to the fluid, wherein the tracer particles are hollow glass microspheres; the wave height measurement device is a wave height meter arranged at preset positions before and after the suspended tunnel section model.

[0072] Specifically, for flow field measurement, wave height meters were placed 1m in front of and behind the model to monitor the elevation of the incident waves and the wave surface behind the structure. Figure 3 As shown; PIV technology is used to monitor the flow field around the model, such as particle image velocimetry systems. Figure 4 As shown.

[0073] The particle image velocimetry system comprises a high-speed camera, a continuous-wave laser, tracer particles of appropriate concentration, and an image correlation algorithm. A 20W continuous-wave solid-state laser, positioned below the water tank, emits an approximately two-dimensional triangular measurement plane to ensure sufficient imaging results within a relatively short exposure time. The measurement plane is filled with tracer particles approximately 10μm in diameter. Hollow glass microspheres (density 1.03g / cm³) are used as tracer particles to ensure flow field tracking. The high-speed camera (pco.dmax HS series) captures images at a frame rate of 200–800 Hz. The measurement area covers 4.33D × 4.33D (tube diameter) to ensure complete capture of near-field wake information. The image resolution is set to 2000 × 2000 pixels. A multi-channel algorithm based on the open-source OpenPIV software is used to calculate the vector field by performing cross-correlation calculations on image pairs. The initial query window size for the first channel is 52×52 pixels with an overlap of 50%, while the final query window size for the fourth channel is 26×26 pixels with an overlap of 50%.

[0074] Furthermore, time synchronization settings are performed on the binocular stereo vision system, the particle image velocimetry system, and the wave height measurement device, including:

[0075] Based on the PCI data acquisition card and its expansion program, a pulse generator is used to synchronously trigger the binocular stereo vision system and the particle image velocimetry system to acquire data, and the data of the wave height measurement device is synchronously recorded through the data acquisition card.

[0076] Specifically, based on the PCI data acquisition card and its extension program, the data obtained by the wave height meter is recorded, and the BNC®575 pulse generator is used to synchronously trigger the PIV device and the binocular camera for acquisition, so as to realize the synchronous measurement of dynamic response, wake vector and wavefront elevation.

[0077] Furthermore, loading tests are conducted under the influence of waves, ocean currents, or their coupling effects, including:

[0078] (1) Record the initial position of the suspended tunnel segment model in still water;

[0079] (2) Generate waves and / or uniform flow, and start recording wave surface changes after the flow field stabilizes;

[0080] (3) Record the motion and flow field changes of the model;

[0081] (4) Use the BSV system's processing program to check whether the model is a two-dimensional motion;

[0082] (5) Stop generating waves and / or uniform flow, and wait for the water surface to return to stillness;

[0083] (6) Repeat steps (2) to (5) to start the next working condition.

[0084] This embodiment measures the translational and rotational motion of the tube and the dynamic tension of the anchor cables in terms of structural response, and measures the front and rear wavefront elevations and wake velocity fields of the model in terms of flow field information, achieving full coverage of detailed structural-flow field dynamic information. A non-contact measurement method is used to acquire the dynamic response information of the suspended tunnel segment model, avoiding interference from sensors and wires on the model's motion and the surrounding flow field, thus improving the accuracy of the experimental results. By integrating the dynamic response measurement and wake field measurement into the same experimental system, the synchronous acquisition of structural motion and flow field evolution is achieved, which is beneficial for studying the coupling relationship between the structure and the flow field.

[0085] The above are merely preferred embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for joint measurement of dynamic response and wake field of a non-contact suspended tunnel model, characterized in that, include: A suspended tunnel segment model is constructed, which includes a pipe body, an anchoring system, and a bottom support structure. The pipe body is used to adjust the buoyancy ratio, the anchoring system is used to adjust the natural frequency of the model, and the bottom support structure is used to adjust the connection angle of the anchoring system. Several visual recognition markers are set on the outer surface of the suspended tunnel segment model, and a binocular stereo vision system is set up outside the test environment. Using the binocular stereo vision system, the translational displacement, rotation angle and anchor cable dynamic tension of the segment model are obtained through image acquisition and spatial coordinate reconstruction, as dynamic response information. A particle image velocimetry system and a wave height measurement device are arranged in the flow field region around the pipe segment model to synchronously acquire the velocity vector field of the wake region of the model and the wave surface elevation information before and after the model, as wake field information; The binocular stereo vision system, the particle image velocimetry system, and the wave height measurement device are time-synchronized to place the dynamic response information and the wake field information in the same spatiotemporal coordinate system. Loading tests were conducted under the influence of waves, ocean currents, or their coupling effects, and the dynamic response information and wake field information of the pipe section model were collected and recorded simultaneously.

2. The method for joint measurement of dynamic response and wake field of a non-contact suspended tunnel model according to claim 1, characterized in that, The tube is made of rigid, light-transmitting material. Detachable counterweight components are installed on both sides inside the tube. By changing the weight of the counterweight, the buoyancy ratio of the model can be adjusted without changing the shape of the model. The mooring system includes flexible connecting cables and elastic elements; The bottom support structure is a steel plate, and the steel plate is provided with several adjustable connecting mechanisms for adjusting the connection angle of the mooring system.

3. The method for joint measurement of dynamic response and wake field of a non-contact suspended tunnel model according to claim 1, characterized in that, Several visual recognition markers are set, including: The first marker point is located at the center of the pipe body, the second marker point is located at a set distance from the center of the pipe body, the third marker point is located on the left anchor cable connecting ring of the pipe body, and the fourth marker point is located on the right anchor cable connecting ring of the pipe body.

4. The method for joint measurement of dynamic response and wake field of a non-contact suspended tunnel model according to claim 3, characterized in that, The binocular stereo vision system includes two high-resolution camera devices whose spatial position relationship has been calibrated, and reconstructs the three-dimensional motion trajectory of the marked points through the principle of parallax and image matching algorithm.

5. The method for joint measurement of dynamic response and wake field of a non-contact suspended tunnel model according to claim 4, characterized in that, The translational displacement of the pipe segment model is determined by the displacement array of the first marker point; the rotation angle of the pipe body is determined by the angle formed by the displacements of the first marker point and the second marker point; the dynamic tension of the anchor cable is obtained by calculating the change in anchor cable length caused by the displacement of the third marker point and / or the fourth marker point using Hooke's law.

6. The method for joint measurement of dynamic response and wake field of a non-contact suspended tunnel model according to claim 5, characterized in that, The dynamic response information of the suspended tunnel segment model includes: ； In the formula, Spring stiffness, expressed in N / m; This is the initial length of the anchor cable, in meters (m). This represents the change in length of the left anchor cable, in meters. This represents the change in length of the right-side anchor cable, in meters. This is the horizontal distance between the anchor cable connecting ring and the bottom connection, in meters. This is the vertical distance between the anchor cable connecting ring and the bottom connection, in meters (m). The horizontal displacement of the central circular sticker is expressed in meters (m). The vertical displacement of the central circular sticker is measured in meters (m). The horizontal displacement of the side five-pointed star sticker is shown in meters. The vertical displacement of the side five-pointed star sticker is shown in meters. This represents the horizontal displacement of the left anchor cable connection ring, in meters (m). This represents the vertical displacement of the left anchor cable connection ring, in meters (m). This represents the horizontal displacement of the right anchor cable connection ring, in meters (m). This represents the vertical displacement of the right anchor cable connection ring; This represents the horizontal displacement of the pipe, in meters (m). This represents the vertical displacement of the pipe, expressed in meters (m). The angle of twist of the pipe body is expressed in degrees (°). This represents the dynamic tension of the left anchor cable, in N. This represents the dynamic tension of the right-side anchor cable, expressed in N.

7. The method for joint measurement of dynamic response and wake field of a non-contact suspended tunnel model according to claim 1, characterized in that, The particle image velocimetry system includes a high-speed camera, a continuous laser for forming a sheet light source, and tracer particles added to the fluid, wherein the tracer particles are hollow glass microspheres; the wave height measurement device is a wave height meter arranged at preset positions before and after the suspended tunnel section model.

8. The method for joint measurement of dynamic response and wake field of a non-contact suspended tunnel model according to claim 1, characterized in that, The time synchronization settings for the binocular stereo vision system, the particle image velocimetry system, and the wave height measurement device include: Based on the PCI data acquisition card and its expansion program, a pulse generator is used to synchronously trigger the binocular stereo vision system and the particle image velocimetry system to acquire data, and the data of the wave height measurement device is synchronously recorded through the data acquisition card.

9. The method for joint measurement of dynamic response and wake field of a non-contact suspended tunnel model according to claim 1, characterized in that, Loading tests are conducted under the influence of waves, ocean currents, or their coupling effects, including: S1. Record the initial position of the suspended tunnel segment model in still water; S2. Generate waves and / or uniform flow, and start synchronously collecting wave surface changes after the flow field stabilizes; S3. Use the processing program of the binocular stereo vision system to verify whether the model motion is two-dimensional planar motion; S4. Stop generating waves and / or uniform flow, and wait for the water surface to return to stillness; S5. Repeat steps S2~S4 to start the next working condition.

Images