A testing apparatus and method for the influence of vortex-induced oscillations on suspended sections of submarine cables.

Abstract

This invention discloses a testing device and method for the influence of vortex-induced oscillations on suspended sections of submarine cables. The device includes: a submarine cable connection module, a vortex-induced oscillation motion generation module, and a force-displacement sensing module. The submarine cable connection module sets the bending angle and span of the suspended section of the submarine cable to a preset bending angle and a preset span, respectively. The vortex-induced oscillation motion generation module applies a preset external force to the suspended section of the submarine cable and controls the direction of motion and the corresponding motion time. The force-displacement sensing module acquires the stress and displacement of the suspended section of the submarine cable under the preset bending angle, preset span, preset external force, direction of motion, and motion time. By implementing this invention, the influence of vortex-induced oscillations on suspended sections of high-voltage submarine cables can be tested.

Description

Technical Field

[0001] This invention relates to the field of submarine cable testing technology, and in particular to a testing device and method for the effect of vortex-induced oscillation on the suspended section of a submarine cable. Background Technology

[0002] With the rapid development of marine energy development and submarine power transmission technology, the demand for high-voltage submarine cables in future power systems is increasing. Submarine cables are a crucial component of marine power system engineering, and their safety and reliability directly affect the stable operation of the entire system. However, in the complex marine environment, submarine cables often have suspended sections exposed to ocean currents, making them prone to vortex-induced oscillations. Vortex-induced oscillations are vibrations caused by the periodic shedding of vortices. Frequent and intense vortex-induced oscillations, especially vortex-induced resonance at specific frequencies, can lead to fatigue damage, structural deformation, and even breakage of submarine cables, severely impacting their lifespan and functionality.

[0003] Currently, research on vortex-induced oscillations of submarine cables mainly focuses on theoretical analysis and numerical simulation, while experimental testing methods rely on laboratory water tanks to simulate the marine environment. However, the experimental cases of this method can only be used to test submarine cables with lower voltage levels.

[0004] Therefore, how to test the impact of vortex-induced oscillations on the suspended section of a high-voltage submarine cable is an urgent problem to be solved. Summary of the Invention

[0005] This invention provides a testing device and method for the influence of vortex-induced oscillation on the suspended section of a submarine cable, which can realize the testing of the influence of vortex-induced oscillation on the suspended section of a high-voltage submarine cable.

[0006] An embodiment of the present invention provides a testing device for the effect of vortex-induced oscillation on the suspended section of a submarine cable, comprising: a submarine cable connection module, a vortex-induced oscillation motion generation module, and a force-displacement sensing module;

[0007] The aforementioned submarine cable connection module includes: a first position adjustable groove, a second position adjustable groove, a left sliding sleeve, a right sliding sleeve, and a semi-arched track; the aforementioned submarine cable connection module is used to set the bending angle of the suspended section of the submarine cable under test to a preset bending angle and fix it on the semi-arched track through the aforementioned left sliding sleeve and the aforementioned right sliding sleeve, and to set the span of the suspended section of the submarine cable under test to a preset span through the aforementioned first position adjustable groove and the aforementioned second position adjustable groove;

[0008] The aforementioned vortex-induced oscillation motion generating module includes: a vortex-induced oscillation motion generating arm, a first motion control motor, a second motion control motor, a first rotating shaft, and a second rotating shaft. The vortex-induced oscillation motion generating module is used to control the vortex-induced oscillation motion generating arm to apply a preset external force to the suspended section of the submarine cable under test via the first motion control motor and the second motion control motor, and to control the first rotating shaft via the first motion control motor and the second rotating shaft via the second motion control motor, thereby controlling the motion direction of the suspended section of the submarine cable under test and the corresponding motion time.

[0009] The aforementioned force-displacement sensing module includes: a first displacement sensor, a second displacement sensor, a first stress sensor, and a second stress sensor; the first displacement sensor and the second displacement sensor are respectively embedded at both ends of the aforementioned vortex-induced oscillation motion generating arm, and the first stress sensor and the second stress sensor are respectively located on both sides of the outer protective sleeve of the submarine cable under test; the force-displacement sensing module is used to obtain the stress and displacement of the suspended section of the submarine cable under test under the aforementioned preset bending angle, the aforementioned preset span, the aforementioned preset external force, the aforementioned direction of movement, and the aforementioned time of movement based on the aforementioned first displacement sensor, the second displacement sensor, the aforementioned first stress sensor, and the aforementioned second stress sensor.

[0010] Furthermore, the aforementioned submarine cable connection module also includes: a first base, a second base, and a semi-arched submarine cable frame; the aforementioned first position adjustable groove is installed in the first base, the aforementioned second position adjustable groove is installed in the second base, and the two ends of the aforementioned semi-arched submarine cable frame are perpendicular to the ground and fixed in the aforementioned first position adjustable groove and the aforementioned second position adjustable groove.

[0011] Furthermore, the aforementioned submarine cable connection module also includes: a limiter; the aforementioned semi-arched track is fixed parallel to the aforementioned semi-arched submarine cable frame, and the aforementioned limiter is installed on the aforementioned semi-arched submarine cable frame.

[0012] Furthermore, the aforementioned vortex-induced oscillation motion generating module also includes:

[0013] The system comprises a first height adjustable frame, a second height adjustable frame, a first support column, a second support column, a first rotatable periodic motion slide rail table, a second rotatable periodic motion slide rail table, a motion controller, a first slide rail base plate, a second slide rail base plate, a first slide rail, and a second slide rail.

[0014] The aforementioned vortex-induced oscillation motion generating arm is fixed on the aforementioned first rotatable periodic motion slide rail and the aforementioned second rotatable periodic motion slide rail. The aforementioned first height-adjustable frame is connected to the aforementioned first slide rail base plate via the aforementioned first support column. The aforementioned second height-adjustable frame is connected to the aforementioned second slide rail base plate via the aforementioned second support column. The aforementioned first rotating shaft is located in the middle of the aforementioned first slide rail. The aforementioned second rotating shaft is located in the middle of the aforementioned second slide rail. The aforementioned first slide rail base plate and the aforementioned second slide rail base plate are respectively located at both ends of the aforementioned vortex-induced oscillation motion generating arm. The aforementioned vortex-induced oscillation motion generating arm is respectively connected to the aforementioned first rotating shaft and the aforementioned second rotating shaft. The aforementioned first end and the aforementioned second end of the motion controller are respectively connected to one end of the aforementioned first motion control motor and the aforementioned second motion control motor. The aforementioned other end of the aforementioned first motion control motor and the aforementioned second motion control motor are connected to the aforementioned vortex-induced oscillation motion generating arm.

[0015] Furthermore, the aforementioned vortex-induced oscillation motion generation module also includes: a human-machine interface; the aforementioned human-machine interface is connected to the third end of the aforementioned motion controller.

[0016] Furthermore, the aforementioned force displacement sensing module also includes: a signal processor and a data processing visualization device; one end of the first stress sensor, the second stress sensor, the first displacement sensor, and the second displacement sensor is connected to one end of the signal processor, and the other end of the signal processor is connected to the data processing visualization device.

[0017] Based on the above-mentioned device, the present invention provides a corresponding embodiment of a test method.

[0018] This invention provides a test method for the impact of vortex-induced oscillations on suspended sections of submarine cables, applicable to any of the above-mentioned apparatuses for testing the impact of vortex-induced oscillations on suspended sections of submarine cables, comprising:

[0019] Using the above-mentioned submarine cable connection module, the bending angle of the suspended section of the submarine cable under test is set to a preset bending angle, and the span of the suspended section of the submarine cable under test is set to a preset span.

[0020] The aforementioned vortex-induced oscillation motion generation module applies a preset external force to the suspended section of the submarine cable under test and controls the direction of motion of the suspended section of the submarine cable under test and the corresponding motion time.

[0021] The stress and displacement of the suspended section of the submarine cable under test are obtained through the aforementioned force and displacement sensing module under the aforementioned preset bending angle, the aforementioned preset span, the aforementioned preset external force, the aforementioned direction of movement, and the aforementioned movement time.

[0022] The embodiments of the present invention have the following beneficial effects:

[0023] This invention provides a testing device and method for the influence of vortex-induced oscillation on suspended sections of submarine cables. The device includes a submarine cable connection module, a vortex-induced oscillation motion generation module, and a force-displacement sensing module. The submarine cable connection module sets the bending angle and span of the suspended section of the submarine cable to a preset bending angle and a preset span, respectively. The vortex-induced oscillation motion generation module applies a preset external force to the suspended section of the submarine cable and controls the direction of motion and the corresponding motion time. The force-displacement sensing module acquires the stress and displacement of the suspended section of the submarine cable under the preset bending angle, preset span, preset external force, direction of motion, and motion time. This invention allows the cable connection module to set the bending angle of the suspended section of the cable under test to a preset bending angle and the span of the suspended section to a preset span. A preset external force is applied to the suspended section via a vortex-induced oscillation generation module, and the movement direction and corresponding movement time of the suspended section are controlled. Finally, a force-displacement sensing module acquires the stress and displacement of the suspended section under the preset bending angle, preset span, preset external force, movement direction, and movement time, thereby enabling the testing of the vortex-induced oscillation effect on the suspended section of a high-voltage submarine cable. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a test device for testing the effect of vortex-induced oscillation on the suspended section of a submarine cable, provided in one embodiment of the invention.

[0025] Figure 2 This is a schematic diagram of the structure of the vortex-induced oscillation motion generation module and the force displacement sensing module provided in one embodiment of the invention;

[0026] Figure 3 This is a flowchart illustrating a test method for assessing the impact of vortex-induced oscillations on the suspended section of a submarine cable, provided by an embodiment of the present invention.

[0027] Explanation of reference numerals in the attached drawings: 1. First base; 2. Vortex-induced oscillation motion generating module; 3. Force displacement sensing module; 4. Second base; 5. First position adjustable groove; 6. Second position adjustable groove; 7. Semi-arched cable frame; 8. Left sliding sleeve; 9. Right sliding sleeve; 10. Limiter; 11. Semi-arched track; 12. Suspended section of the cable to be tested; 201. First height adjustable frame; 202. Second height adjustable frame; 203. First rotatable periodic motion slide rail; 204. Second rotatable periodic motion slide rail; 205. Vortex-induced oscillation motion generating arm; 206. First... Motion control motor 206, second motion control motor 207, motion controller 208, human-machine interface 209, first support column 210, second support column 211, first slide rail 212, second slide rail 213, first slide rail base plate 214, second slide rail base plate 215, first rotating shaft 216, second rotating shaft 217, first displacement sensor 301, second displacement sensor 302, first stress sensor 303, second stress sensor 304, signal processor 305, data processing visualization device 306. Detailed Implementation

[0028] The technical solutions of this invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0029] like Figure 1 As shown, an embodiment of the present invention provides a testing device for the influence of vortex-induced oscillations on the suspended section of a submarine cable, comprising:

[0030] Submarine cable connection module, vortex-induced oscillation motion generation module 2, and force displacement sensing module 3;

[0031] The aforementioned submarine cable connection module includes: a first position adjustable groove 5, a second position adjustable groove 6, a left sliding sleeve 8, a right sliding sleeve 9, and a semi-arched track 11; the aforementioned submarine cable connection module is used to set the bending angle of the suspended section 12 of the submarine cable under test to a preset bending angle and fix it on the semi-arched track 11 through the left sliding sleeve 8 and the right sliding sleeve 9, and to set the span of the suspended section 12 of the submarine cable under test to a preset span through the first position adjustable groove 5 and the second position adjustable groove 6;

[0032] Specifically, the first adjustable groove 5 and the second adjustable groove 6 can adjust the left and right span of the suspended section 12 of the submarine cable under test from 5 to 12 meters. By sliding and adjusting the position of the left sliding sleeve 8 and the right sliding sleeve 9 on the semi-arched track 11, the bending angle of the suspended section 12 of the submarine cable under test can be adjusted. The left sliding sleeve 8 and the right sliding sleeve 9 can fix the suspended section 12 of the submarine cable under test through their respective ring clamps and bolts. The semi-arched track 11 is used to place the fixed suspended section 12 of the submarine cable under test.

[0033] Specifically, the structure of the vortex-induced oscillation motion generation module 2 and the force-displacement sensing module 3 is as follows: Figure 2 As shown, the aforementioned vortex-induced oscillation motion generating module 2 is arranged in pairs before and after the suspended section 12 of the submarine cable under test, enabling synchronous application of force at different positions on the suspended cable. The aforementioned vortex-induced oscillation motion generating arm 205 is arc-shaped, ensuring uniform force distribution on the suspended section 12 of the submarine cable under test. The aforementioned first motion control motor 206 and second motion control motor 207 drive the aforementioned first rotating shaft 216 and second rotating shaft 217, enabling the suspended section 12 of the submarine cable under test to perform linear periodic motion parallel to any direction of the cable cross-section. The number of vortex-induced oscillation motion generating modules 2 can be changed according to experimental requirements, generating localized and overall force application modes.

[0034] The aforementioned vortex-induced oscillation motion generating module 2 includes: a vortex-induced oscillation motion generating arm 205, a first motion control motor 206, a second motion control motor 16, a first rotating shaft 216, and a second rotating shaft 217. The aforementioned vortex-induced oscillation motion generating module 2 is used to control the aforementioned vortex-induced oscillation motion generating arm 205 to apply a preset external force to the aforementioned suspended section 12 of the submarine cable under test through the aforementioned first motion control motor 206 and the aforementioned second motion control motor 207, and to control the aforementioned first rotating shaft 216 and the aforementioned second rotating shaft 217 through the aforementioned first motion control motor 206, thereby controlling the motion direction of the aforementioned suspended section 12 of the submarine cable under test and the motion time corresponding to the motion direction.

[0035] The force-displacement sensing module 3 includes: a first displacement sensor 301, a second displacement sensor 302, a first stress sensor 303, and a second stress sensor 304; the first displacement sensor 301 and the second displacement sensor 302 are respectively embedded in both ends of the vortex-induced oscillation motion generating arm 205, and the first stress sensor 303 and the second stress sensor 304 are respectively located on both sides of the outer protective sleeve of the submarine cable under test; the force-displacement sensing module 3 is used to obtain the stress and displacement of the suspended segment 12 of the submarine cable under test under the preset bending angle, the preset span, the preset external force, the motion direction, and the motion time based on the first displacement sensor 301, the second displacement sensor 302, the first stress sensor 303, and the second stress sensor 304.

[0036] Specifically, the first displacement sensor 301 and the second displacement sensor 302 can acquire the displacement of the submarine cable under test in real time, and the first stress sensor 303 and the second stress sensor 304 can acquire the stress of the submarine cable under test in real time.

[0037] The aforementioned submarine cable connection module further includes: a first base 1, a second base 4, and a semi-arched submarine cable frame 7; the first position adjustable groove 5 is installed in the first base 1, the second position adjustable groove 6 is installed in the second base 4, and the two ends of the semi-arched submarine cable frame 7 are perpendicular to the ground and fixed in the first position adjustable groove 5 and the second position adjustable groove 6, respectively.

[0038] Specifically, the first base 1 and the second base 4 are used together with the first groove and the second groove to fix the two ends of the suspended section 12 of the submarine cable to be tested, which is placed in the semi-arched track 11 in the middle of the semi-arched submarine cable frame 7.

[0039] The aforementioned submarine cable connection module further includes: a limiter 10; the aforementioned semi-arched track 11 is fixed in parallel on the aforementioned semi-arched submarine cable frame 7, and the aforementioned limiter 10 is installed on the aforementioned semi-arched submarine cable frame 7.

[0040] Specifically, the aforementioned limiter 10 can limit the left sliding sleeve 8 and the right sliding sleeve 9 to a set position on the track.

[0041] The aforementioned vortex-induced oscillation motion generating module 2 further includes:

[0042] First height adjustable frame 201, second height adjustable frame 202, first support column 210, second support column 211, first rotatable periodic motion slide rail table 203, second rotatable periodic motion slide rail table 204, motion controller 208, first slide rail base plate 214, second slide rail base plate 215;

[0043] The aforementioned vortex-induced oscillation motion generating arm 205 is fixed on the aforementioned first rotatable periodic motion slide rail 203 and the aforementioned second rotatable periodic motion slide rail 204. The aforementioned first height-adjustable frame 201 is connected to the aforementioned first slide rail base plate 214 via the aforementioned first support column 210, and the aforementioned second height-adjustable frame 202 is connected to the aforementioned second slide rail base plate 215 via the aforementioned second support column 211. The aforementioned first rotating shaft 216 is located in the middle of the aforementioned first slide rail 212, and the aforementioned second rotating shaft 217 is located in the middle of the aforementioned second slide rail 213. A slide rail base plate 214 and a second slide rail base plate 215 are respectively located at both ends of the vortex-induced oscillation motion generating arm 205. The vortex-induced oscillation motion generating arm 205 is respectively connected to the first rotating shaft 216 and the second rotating shaft 217. The first end and the second end of the motion controller 208 are respectively connected to one end of the first motion control motor 206 and the second motion control motor 207. The other end of the first motion control motor 206 and the second motion control motor 207 is connected to the vortex-induced oscillation motion generating arm 205.

[0044] Specifically, the first height-adjustable frame 201 and the second height-adjustable frame 202 can be used to control the suspended sections of the submarine cable at different suspension heights. Simultaneously, in conjunction with the first rotatable periodic motion slide rail 203 and the second rotatable periodic motion slide rail 204, the movement direction of the suspended section 12 of the submarine cable under test is controlled by controlling the movement direction of the vortex-induced oscillation motion generating arm 205. The first height-adjustable frame 201 and the second height-adjustable frame 202 are respectively connected by bolts to the first support column 210. The second support column 211 is connected to the first slide rail base plate 214 and the second slide rail base plate 215 on the first rotatable periodic motion slide rail table 203 and the second rotatable periodic motion slide rail table 204. The vortex-induced oscillation motion generating arm 205 applies a preset external force to the suspended section 12 of the submarine cable under test. The preset external force includes the frequency and amplitude of the external force. The motion controller 208 is used to control the first motion control motor 206 and the second motion control motor 207 to apply the external force with the set frequency and amplitude to the suspended section 12 of the submarine cable under test.

[0045] The aforementioned vortex-induced oscillation motion generation module 2 further includes: a human-machine interface 209; the aforementioned human-machine interface 209 is connected to the third end of the aforementioned motion controller 208.

[0046] Specifically, the aforementioned human-computer interaction interface 209 is used to set the frequency, amplitude, and duration of the external force applied to the suspended section 12 of the submarine cable under test, based on the cable voltage level and the laying and operation status of the sea area.

[0047] The aforementioned force displacement sensing module 3 also includes:

[0048] Signal processor 305 and data processing visualization device 306;

[0049] One end of the first stress sensor 303, the second stress sensor 304, the first displacement sensor 301, and the second displacement sensor 302 are connected to one end of the signal processor 305, and the other end of the signal processor 305 is connected to the data processing visualization device 306.

[0050] Specifically, the signal processor 305 is used to amplify and eliminate interference signals in the signals acquired by the first stress sensor 303, the second stress sensor 304, the first displacement sensor 301, and the second displacement sensor 302, and convert the interference-free signal into a digital signal, and then transmit the digital signal to the data processing visualization device 306. The data processing visualization device 306 is used to display the signal in the form of a curve on the computer, which is the force-displacement curve.

[0051] Based on the above-described apparatus embodiments, the present invention provides corresponding method embodiments.

[0052] Indicative, such as Figure 3 As shown, another embodiment of the present invention provides a test method for the influence of vortex-induced oscillation on the suspended section of a submarine cable. The above method is applicable to the test apparatus for the influence of vortex-induced oscillation on the suspended section of a submarine cable described in any of the above embodiments, and includes:

[0053] Step S101: Using the above-mentioned submarine cable connection module, set the bending angle of the suspended section of the submarine cable to be tested to a preset bending angle, and set the span of the suspended section of the submarine cable to be tested to a preset span.

[0054] In this step, the bending angle of the suspended section of the submarine cable under test is set to a preset bending angle by using the left and right sliding sleeves in the submarine cable connection module, and the span of the suspended section of the submarine cable under test is set to a preset span by using the first and second position adjustable grooves.

[0055] Step S102: Apply a preset external force to the suspended section of the submarine cable under test through the above-mentioned vortex-induced oscillation motion generation module, and control the motion direction of the suspended section of the submarine cable under test and the motion time corresponding to the motion direction.

[0056] In this step, the first and second motion control motors in the vortex-induced oscillation motion generation module control the vortex-induced oscillation generating arm to apply a preset external force to the suspended section of the submarine cable under test. The first and second rotating shafts control the direction of motion of the suspended section of the submarine cable under test and the corresponding motion time.

[0057] Step S103: Using the force displacement sensing module, obtain the stress and displacement of the suspended section of the submarine cable under test under the preset bending angle, preset span, preset external force, preset direction of movement, and preset time.

[0058] In this step, the stress of the suspended section of the submarine cable under test is obtained by the first stress sensor and the second stress sensor in the force displacement sensing module under preset bending angle, preset span, preset external force, direction of movement and movement time. The displacement of the suspended section of the submarine cable under test is obtained by the first displacement sensor and the second displacement sensor under preset bending angle, preset span, preset external force, direction of movement and movement time.

[0059] By implementing the above embodiments of the present invention, it is possible to test the influence of vortex-induced oscillations in the suspended section of a high-voltage submarine cable.

[0060] The above are preferred embodiments of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications are also considered to be protected by the present invention.

Claims

1. A testing device for the influence of vortex-induced oscillations on suspended sections of submarine cables, characterized in that, include: Submarine cable connection module, vortex-induced oscillation motion generation module, and force-displacement sensing module; The submarine cable connection module includes: a first position adjustable groove, a second position adjustable groove, a left sliding sleeve, a right sliding sleeve, and a semi-arched track; the submarine cable connection module is used to set the bending angle of the suspended section of the submarine cable under test to a preset bending angle and fix it on the semi-arched track through the left sliding sleeve and the right sliding sleeve, and to set the span of the suspended section of the submarine cable under test to a preset span through the first position adjustable groove and the second position adjustable groove; The submarine cable connection module further includes: a first base, a second base, and a semi-arched submarine cable frame; the first position adjustable groove is installed in the first base, the second position adjustable groove is installed in the second base, and the two ends of the semi-arched submarine cable frame are perpendicular to the ground and fixed in the first position adjustable groove and the second position adjustable groove, respectively. The vortex-induced oscillation motion generating module includes: a vortex-induced oscillation motion generating arm, a first motion control motor, a second motion control motor, a first rotating shaft, and a second rotating shaft. The vortex-induced oscillation motion generating module is used to control the vortex-induced oscillation motion generating arm to apply a preset external force to the suspended section of the submarine cable under test through the first motion control motor and the second motion control motor, and to control the first rotating shaft through the first motion control motor and the second rotating shaft through the second motion control motor, thereby controlling the motion direction of the suspended section of the submarine cable under test and the motion time corresponding to the motion direction. The force-displacement sensing module includes: a first displacement sensor, a second displacement sensor, a first stress sensor, and a second stress sensor; the first displacement sensor and the second displacement sensor are respectively embedded at both ends of the vortex-induced oscillation motion generating arm, and the first stress sensor and the second stress sensor are respectively located on both sides of the outer protective sleeve of the submarine cable under test; the force-displacement sensing module is used to obtain the stress and displacement of the suspended segment of the submarine cable under test under the preset bending angle, the preset span, the preset external force, the direction of movement, and the movement time based on the first displacement sensor, the second displacement sensor, the first stress sensor, and the second stress sensor.

2. The testing device for the influence of vortex-induced oscillation on the suspended section of a submarine cable according to claim 1, characterized in that, The submarine cable connection module further includes: a limiter; the semi-arched track is fixed parallel to the semi-arched submarine cable frame, and the limiter is installed on the semi-arched submarine cable frame.

3. The testing device for the influence of vortex-induced oscillation on the suspended section of a submarine cable according to claim 1, characterized in that, The vortex-induced oscillation motion generating module further includes: The system comprises a first height adjustable frame, a second height adjustable frame, a first support column, a second support column, a first rotatable periodic motion slide rail table, a second rotatable periodic motion slide rail table, a motion controller, a first slide rail base plate, a second slide rail base plate, a first slide rail, and a second slide rail. The vortex-induced oscillation motion generating arm is fixed on the first rotatable periodic motion slide rail and the second rotatable periodic motion slide rail. The first height-adjustable frame is connected to the first slide rail base plate through the first support column, and the second height-adjustable frame is connected to the second slide rail base plate through the second support column. The first rotating shaft is located in the middle of the first slide rail, and the second rotating shaft is located in the middle of the second slide rail. The first slide rail base plate and the second slide rail base plate are respectively located at both ends of the vortex-induced oscillation motion generating arm. The vortex-induced oscillation motion generating arm is connected to the first rotating shaft and the second rotating shaft respectively. The first end and the second end of the motion controller are respectively connected to one end of the first motion control motor and the second motion control motor, and the other end of the first motion control motor and the second motion control motor are connected to the vortex-induced oscillation motion generating arm.

4. The testing device for the influence of vortex-induced oscillation on the suspended section of a submarine cable according to claim 3, characterized in that, The vortex-induced oscillation motion generation module further includes: a human-machine interface; the human-machine interface is connected to the third end of the motion controller.

5. The testing device for the influence of vortex-induced oscillation on the suspended section of a submarine cable according to claim 4, characterized in that, The force displacement sensing module further includes: a signal processor and a data processing visualization device; one end of the first stress sensor, the second stress sensor, the first displacement sensor, and the second displacement sensor is connected to one end of the signal processor, and the other end of the signal processor is connected to the data processing visualization device.

6. A method for testing the influence of vortex-induced oscillation on the suspended section of a submarine cable, using the testing apparatus for the influence of vortex-induced oscillation on the suspended section of a submarine cable as described in any one of claims 1-5, characterized in that, include: The bending angle of the suspended section of the submarine cable under test is set to a preset bending angle, and the span of the suspended section of the submarine cable under test is set to a preset span, through the submarine cable connection module. The vortex-induced oscillation motion generation module applies a preset external force to the suspended section of the submarine cable under test and controls the direction of motion of the suspended section of the submarine cable under test and the corresponding motion time. The force-displacement sensing module acquires the stress and displacement of the suspended section of the submarine cable under test under the preset bending angle, preset span, preset external force, preset direction of movement, and preset time of movement.

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