Dynamic testing device and testing method for axial combination performance of cable and application

Abstract

The invention discloses a cable axial combination performance dynamic testing device which comprises a supporting frame, one end of the supporting frame is a stretching end, the other end of the supporting frame is a torsion end, and tracks are arranged on the two sides of the supporting frame. The stretching end is provided with a tensile machine, a stretching cross beam and a stretching connecting assembly, one end of the tensile machine is fixed to the stretching end, the other end of the tensile machine is fixedly connected with the stretching cross beam, and the two ends of the stretching cross beam are slidably connected with the rails; the torsion end is provided with torsion equipment and a torsion connecting assembly; the torsion equipment is fixed with the torsion end, and the torsion connecting assembly is in coupling connection with the torsion equipment; one end of a to-be-tested cable is connected with the stretching connection assembly, the other end of the to-be-tested cable is connected with the torsion connection assembly, and the cable is connected with a monitoring and detecting system which is used for monitoring indexes such as torsion angle change, optical fiber performance change, conductor resistance change and insulation resistance change of the cable in real time. The device can be used for deeply carrying out mechanism research on stretching and twisting of the cable.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, and in particular to a device, a method and a use for dynamically testing the axial combination performance of cables. Background Art

[0002] Cables are essential engineering equipment in marine engineering, scientific research, exploration and other marine technology fields. They are mainly used to connect surface ships and underwater systems, and provide power transmission, data signal transmission, chemical agent and hydraulic fluid delivery for underwater system equipment. In recent years, with the advancement of the country's deep-sea strategy, the types and functions of cables have continued to increase, and the application depth has continued to increase, which has put forward higher requirements for the safety risks of cables. In offshore construction and application, cables will be subjected to severe tests caused by ship movement and environmental loads such as waves and currents, such as stretching, bending, torsion and extreme instantaneous stretching and bending. Especially in the process of cable laying and installation in deep-water environments, cables must also withstand torsional loads caused by installation equipment. Since the internal units of cables such as steel wire, aramid, cable, optical cable, etc. are all spirally twisted structures, excessive torsion can easily cause cable damage.

[0003] With the development of deepwater fields, cables can not only provide functions such as power transmission, data signal transmission, chemical agent and hydraulic fluid transportation for underwater system equipment, but also have the function of traction, deployment and recovery for underwater equipment installation. Due to the large-scale and heavy-duty equipment, the mechanical properties of cables are increasingly required, and the application risks under the combined action of tension and torsion are becoming increasingly prominent. At present, in the field of cable technology in China, the evaluation methods for its torsional performance are relatively simple, such as simply evaluating its torsional stiffness by applying torque to the cable, or determining its free torsion angle by stretching. There is no in-depth evaluation of the comprehensive mechanical properties of the cable under the combined action of tension and torsion. Therefore, there is an urgent need for a testing method and platform that can comprehensively evaluate the comprehensive mechanical properties of cables, especially umbilical cables under complex working conditions. Summary of the invention

[0004] The present invention aims to overcome at least one defect of the above-mentioned prior art, and provides a cable axial combination performance dynamic test device, test method and use, so as to realize tensile test under free torsion, tensile test under constrained torsion, tensile test under specific torsion, torsion test under zero tension, torsion test under specific tension, and at the same time, the stability of the photoelectric transmission inside the cable can be monitored in real time during the test process, so as to study the comprehensive performance of the cable under the axial tensile torsion combination. The present invention mainly takes the umbilical cable as the research object.

[0005] Specifically, the present invention provides a dynamic test device for the axial combination performance of cables, including a support frame, one end of the support frame is a tensile end, the other end is a torsion end, and tracks are arranged on both sides; the tensile end is provided with a tensile machine, a tensile beam and a tensile connection assembly, one end of the tensile machine is fixed to the tensile end, and the other end is fixedly connected to the tensile beam, and both ends of the tensile beam are slidably connected to the track; the torsion end is provided with a torsion device and a torsion connection assembly; the torsion device is fixed to the torsion end, and the torsion connection assembly is fixed to the torsion device; one end of the cable to be tested is connected to the tensile connection assembly, and the other end is connected to the torsion connection assembly. A monitoring and detection system is connected to the cable, which is used to monitor the torsion angle change, optical fiber performance change, conductor resistance change, insulation resistance change and other indicators of the cable in real time.

[0006] The support frame is fixed on the ground, and tracks are arranged in the front-to-back direction inside the support frame, and the tensile beam can move forward and backward along the track. The dynamic test method for the axial tensile-torsion combined performance of the cable can monitor the torsion angle, torque, fiber attenuation, fiber continuity, insulation resistance, DC resistance and other parameters of the cable during the test in real time through the monitoring and detection system to reflect the damage caused to the cable by the torsion or tensile limit test. The test device of the present invention can be used to carry out various combination tests on cables, especially the tensile mechanics and torsion mechanics of cables, and conduct in-depth research on the mechanism of cable tension and torsion. In actual engineering, the damage of cables during the installation process is mainly caused by torsional damage under tension. The present invention can effectively simulate the mechanical response generated by the combined state of tension and torsion that occurs during the installation and transportation of actual projects, and provide guidance and safety guarantees for engineering construction operations.

[0007] Furthermore, the stretching end of the cable passes through the stretching connection assembly, including a stretching end cable tail line and a stretching end optical cable tail line; the monitoring and detection system includes an insulation resistance meter and an optical power meter, the insulation resistance meter is arranged at the end of the stretching end cable tail line; the optical power meter is arranged at the end of the stretching end optical cable tail line.

[0008] Furthermore, the stretching connection assembly includes a first flange and a first load-bearing joint; one end of the first flange is connected to the stretching beam, and the other end is connected to the first load-bearing joint, and the stretching end cable tail wire and the stretching end optical cable tail wire pass through the first load-bearing joint and extend from the side of the first flange. The first flange is completely fixed to the stretching beam, and the rotation of the first flange can be limited because the stretching beam is constrained by the track.

[0009] Furthermore, the torsion end of the cable passes through the torsion connection assembly, including a torsion end cable tail line and a torsion end optical cable tail line; the monitoring and detection system also includes a DC resistance meter and a test light source, the DC resistance meter is arranged at the end of the torsion end cable tail line; the test light source is arranged at the end of the torsion end optical cable tail line.

[0010] The test light source is connected to the twisted end cable tail or the stretched end cable tail to provide the excitation light source, and the optical power meter is connected to the stretched end cable tail or the twisted end cable tail on the other side to monitor the changes in the optical fiber performance in the cable. The DC resistance meter and the insulation resistance meter are connected to the twisted end cable tail and the stretched end cable tail respectively to monitor the changes in the conductor resistance and insulation resistance in the cable.

[0011] Furthermore, the torsion connection assembly includes a primary connected rotating bearing, a second flange, and a second load-bearing joint; the torsion end of the support frame is also provided with a fixed beam, the outer side of the rotating bearing is connected and fixed to the fixed beam, and the inner side is connected to the second flange; one side of the second flange is fixedly constrained in the front and rear directions by the fixed beam, and the other side is free to rotate through the rotating bearing.

[0012] The torsion device of the present invention can apply torque to the second flange provided at one end of the cable by means of gears or pulleys, so that one end of the cable can be rotated or restricted from rotating, thereby generating a torsion angle and torque. Moreover, by releasing the connection between the torsion device and the second flange, one end of the cable can be freely rotated under the action of tension without being restricted by torsion. Moreover, the present invention is provided with a rotating bearing between the second flange and the fixed crossbeam, so as to realize the free rotation of the cable. The structure of the second flange and the first flange designed by the present invention is a cylindrical structure, with flange plates at both ends and a cylinder in the middle, and a hole is opened on the side of the cylinder for the cable, especially the tail wire of the cable of the present invention, to extend out.

[0013] Furthermore, the monitoring and detection system includes an angle monitor, a first angle sensor and a second angle sensor, the first angle sensor and the second angle sensor are respectively tied and fixed on cables, and the angle monitor is connected to the first angle sensor and the second angle sensor via cables.

[0014] During the test, the torsion angle of the cable can be measured by the first angle sensor and the second angle sensor, and the relative torsion angle within the calibrated length of the cable can be recorded by the angle monitor. The first angle sensor and the second angle sensor are tied and fixed on the cable, symmetrically tied in the middle of the cable, and the spacing is generally 1~2m.

[0015] Furthermore, a hydraulic pipeline is integrated in the cable, and both ends of the hydraulic pipeline extend out through the sides of the torsion connection component and the tension connection component respectively. Either end is sealed and the other end is connected to a water pressure device, so that the pressure state of the hydraulic pipeline can be monitored in real time while applying tension or torque.

[0016] The present invention also provides a dynamic testing method for the axial combination performance of cables, including a testing method for applying axial tension under free torsion of the cable, a testing method for applying axial tension under constrained torsion of the cable, and a testing method for applying axial tension under a specified torsion angle of the cable; a testing method for applying a specified torque or torsion angle under zero axial tension of the cable, and a testing method for applying a specified torque or torsion angle under a specified axial tension of the cable.

[0017] Furthermore, the test method for applying axial tension when the cable is freely twisted is: S1: Disconnect the torsion device from the second flange so that the torsion end of the cable can rotate freely without torsion constraint; S2: Start the tensile testing machine, and pull the tensile beam forward and backward by extending and retracting the pull rod of the tensile testing machine. The tensile beam applies axial tension to the cable by driving the first flange and the first load-bearing joint; S3: applying different tension values ​​to make the cable generate corresponding torsional angles, measuring the torsional angles of the cable by the first angle sensor and the second angle sensor respectively, and recording the relative torsional angle within the calibrated length of the cable by the angle monitor; S4: The test light source is connected to the twisted end cable tail or the stretched end cable tail to provide an excitation light source, and the optical power meter is connected to the stretched end cable tail or the twisted end cable tail on the other side to monitor the changes in the optical fiber performance in the cable; the DC resistance meter and the insulation resistance meter are connected to the twisted end cable tail and the stretched end cable tail respectively to monitor the changes in the conductor resistance and insulation resistance in the cable; The step S4 is to realize dynamic monitoring under different tension values ​​during the step S3, and the step S4 and the step S3 are not in any particular order; The test method for applying axial tension when the cable is torsionally constrained is: The torsion device locks the second flange through a gear or a pulley to limit the rotation of the torsion end of the cable; the tensile machine is started to apply axial tension to the cable, and different tension values ​​are applied. The torque value generated by the different tensions is fed back through the torsion device. At the same time, the photoelectric signal in the cable is monitored in real time while gradually increasing the tension value. The real-time monitoring step is the same as step S4; The test method for applying axial tension to the cable at a specified torsion angle is: The torsion device is connected to the second flange through a gear or a pulley, the torsion device is started, the cable is rotated to a specified angle using the second flange, and the tensile machine is started to apply axial tension to the cable; different tension values ​​are applied, and the torque values ​​generated by different tensions are fed back through the torsion device. At the same time, the photoelectric signal in the cable is monitored in real time while the tension value is gradually increased. The real-time monitoring step is the same as step S4; The test method for applying a specified torque or torsion angle to the cable under zero axial tension is: The axial tension of the cable is adjusted to zero or close to zero by adjusting the tensile machine, and the cable is kept horizontal; the torsion device is started, the cable is subjected to torque through the second flange, the cable is slowly twisted to a certain angle or torque, and the photoelectric signal in the cable is monitored in real time. The real-time monitoring step is the same as step S4; The test method for applying a specified torque or torsion angle to the cable under a specified axial tension is: The cable is stretched to a specified tension value by adjusting the tensile machine, and then the torsion device is started. The cable is subjected to torque through the second flange, and the cable is slowly twisted to a certain angle or torque. The photoelectric signal in the cable is monitored in real time. The real-time monitoring step is the same as step S4.

[0018] The present invention also provides a use of a cable axial combination performance dynamic test device, including the above-mentioned cable axial combination performance dynamic test device and cable axial combination performance dynamic test method, wherein the cable is a cable or a marine flexible pipe cable, wherein the marine flexible pipe cable includes a submarine cable, a submarine optical cable, and a flexible pipe.

[0019] Compared with the prior art, the present invention has the following beneficial effects: The present invention proposes a set of dynamic testing methods suitable for the axial combination performance of cables, and designs a set of dynamic testing platforms for the axial combination performance of cables. Cables include but are not limited to cables, submarine cables, submarine optical cables, flexible pipes, etc. Through the device, various combination tests of tensile mechanics and torsional mechanics of cables can be carried out, especially for cables, in-depth research on the mechanism of tension and torsion of cables can be carried out. Due to the damage of cables during installation in actual engineering, torsional damage under tension is one of the main factors. At present, according to the requirements of industry standards and specifications, only tensile tests under free torsion and tensile tests under constrained torsion are carried out for cables, and there are no tensile tests under specific torsion states or torsion tests under specific tension. The dynamic testing method and platform for the axial combination performance of cables proposed in the present invention can effectively simulate the mechanical response generated by the combined state of tension and torsion that occurs during the installation and transportation of actual projects, and provide guidance and safety guarantees for engineering construction operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1It is a structural schematic diagram of the umbilical cable axial combination performance dynamic testing device of the present invention.

[0021] Figure 2 It is a schematic diagram of the internal structure of the dynamic testing device for the axial combination performance of the umbilical cable of the present invention.

[0022] Figure 3 It is a schematic diagram of the partially enlarged structure of the torsion end of the umbilical cable axial combination performance dynamic testing device of the present invention.

[0023] Figure 4 It is a schematic diagram of the connection structure of the umbilical cable assembly and the monitoring and detection system of the present invention.

[0024] Figure 5 This is the tensile performance curve of the umbilical cable under the torsion restriction condition of Example 8.

[0025] Figure 6 This is the tensile performance curve of Example 8 under free torsion conditions.

[0026] Figure 7 This is the free torsion angle curve under different tensions of Example 8.

[0027] Figure numerals: 1. support frame, 2. tensile testing machine, 3. stretching beam, 4. fixed beam, 5. torsion device, 6. rotating bearing, 7. second flange, 8. first flange, 9. umbilical cable, 10. first load-bearing joint, 11. second load-bearing joint, 12. torsion end cable tail, 13. torsion end optical cable tail, 14. stretching end cable tail, 15. stretching end optical cable tail, 16. first angle sensor, 17. second angle sensor, 18. DC resistance meter, 19. test light source, 20. angle monitor, 21. insulation resistance meter, 22. optical power meter. DETAILED DESCRIPTION

[0028] The drawings in the embodiments provide a more detailed description of the technical solutions in the embodiments of the present invention. In the drawings, the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The described embodiments are part of the embodiments of the present invention, not all of them. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limitations on the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. The embodiments of the present invention are described in detail below in conjunction with the drawings.

[0029] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0030] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0031] Example 1

[0032] This embodiment provides an umbilical cable axial combination performance dynamic test device, including a test loading module, an umbilical cable assembly, a connection tooling and a monitoring and detection system; Figure 1 and 2 As shown, The test loading module mainly provides support, constraint, tension loading and torque loading functions for the test, including a support frame 1, a tensile testing machine 2, a tensile beam 3, a fixed beam 4, and a torsion device 5, wherein the support frame 1 is fixed on the ground, and tracks are arranged on the front and rear sides of the support frame 1, and the tensile beam 3 can move forward and backward along the tracks.

[0033] The umbilical cable assembly includes an umbilical cable 9, a first load-bearing joint 11, a second load-bearing joint 10, a torsion end cable tail 12, a torsion end optical cable tail 13, a tension end cable tail 14, and a tension end optical cable tail 15. The first load-bearing joint 11 and the second load-bearing joint 10 are respectively connected to the two ends of the umbilical cable 9, and can transmit the axial tension borne by the umbilical cable 9.

[0034] Connecting tooling, combining Figure 3As shown, it includes a rotating bearing 6, a second flange 7 and a first flange 8. The second flange 7 is used to connect the second load-bearing joint 10 and the fixed beam 4, and the first flange 8 is used to connect the first load-bearing joint 11 and the tensile beam 3. The rotating bearing 6 is connected and fixed to the fixed beam 4 on the outside, and connected and fixed to the neck of the second flange 7 on the inside. One side of the second flange 7 is fixed and constrained in the front and rear directions by the fixed beam 4, but can rotate freely through the rotating bearing 6. The first flange 8 is completely fixed to the tensile beam 3. Since the tensile beam 3 is constrained by the track, the rotation of the first flange 8 can be limited. The structure of the second flange 7 and the first flange 8 is a cylindrical structure, with flange plates at both ends and a cylinder in the middle, and a hole is opened on the side of the cylinder to allow the tail line of the umbilical cable 9 to extend.

[0035] Combination Figure 4 As shown, the monitoring and detection system includes a DC resistance meter 18, a test light source 19, a first angle sensor 16, a second angle sensor 17, an angle monitor 20, an insulation resistance meter 21, and an optical power meter 22. The first angle sensor 16 and the second angle sensor 17 are respectively tied and fixed on the umbilical cable 9, symmetrically tied in the middle of the umbilical cable 9, and the spacing is 1-2m.

[0036] The tensile testing machine 2 moves the tensile beam 3 forward and backward by extending and retracting the pull rod, and the tensile beam 3 applies tension to the umbilical cable 9 by driving the first flange 8 and the first load-bearing joint 11. At the same time, the torsion device 5 applies torque to the second flange 7 by means of gears or pulleys, etc., which can rotate or restrict the rotation of one end of the umbilical cable 9, thereby generating a torsion angle and torque. In addition, by releasing the connection between the torsion device 5 and the second flange 7, the umbilical cable 9 can rotate freely at one end under the action of tension without being restricted by torsion. The angle monitor 20 is connected to the first angle sensor 16 and the second angle sensor 17 respectively through cables. During the test, the torsion angle of the umbilical cable 9 can be measured by the first angle sensor 16 and the second angle sensor 17 respectively, and the relative torsion angle within the calibrated length of the umbilical cable 9 can be recorded by the angle monitor 20.

[0037] The monitoring and detection system can be used to monitor the torsion angle, torque, fiber attenuation, fiber continuity, insulation resistance, DC resistance and other parameters of the umbilical cable in real time during the test to reflect the damage caused to the umbilical cable by the torsion or tensile limit test. Specifically, the test light source 19 provides an excitation light source by connecting to the torsion end optical cable tail line 13 or the tensile end optical cable tail line 15, and the optical power meter 22 can monitor the changes in the optical fiber performance in the umbilical cable 9 by connecting to the tensile end optical cable tail line 15 or the torsion end optical cable tail line 13 on the other side. At the same time, the DC resistance meter 18 and the insulation resistance meter 21 are connected to the torsion end cable tail line 12 and the tensile end cable tail line 14 respectively to monitor the changes in the conductor resistance and insulation resistance in the umbilical cable 9.

[0038] Example 2

[0039] The difference between this embodiment and embodiment 1 is that a hydraulic pipeline is integrated in the umbilical cable 9, and the tail line of the hydraulic pipeline can extend through the side openings of the second flange 7 and the first flange 8. The tail line at one end is sealed and connected to a water pressure device at the other end. The pressure state of the hydraulic pipeline can be monitored in real time while applying tension or torque.

[0040] Example 3

[0041] This embodiment provides a method for testing the application of axial tension when the umbilical cable assembly is freely twisted. The twisting device 5 is separated from the second flange 7, and the twisted end of the umbilical cable 9 can rotate freely without being constrained by twisting. The tensile machine 2 is started, and the tensile beam 3 is pulled forward and backward by the extension and contraction of the pull rod. The tensile beam 3 applies axial tension to the umbilical cable 9 by driving the first flange 8 and the first load-bearing joint 11. When different tension values ​​are applied, the umbilical cable 9 will produce corresponding torsion angles. The torsion angles of the umbilical cable 9 can be measured by the first angle sensor 16 and the second angle sensor 17 respectively, and the relative torsion angle within the calibrated length of the umbilical cable 9 can be recorded by the angle monitor 20. At the same time, the photoelectric signal in the umbilical cable can be monitored in real time when the tension value is gradually increased. The test light source 19 is connected to the twisting end optical cable tail line 13 or the stretching end optical cable tail line 15 to provide an excitation light source, and the optical power meter 22 is connected to the stretching end optical cable tail line 15 or the twisting end optical cable tail line 13 on the other side to monitor the performance changes of the optical fiber in the umbilical cable 9. The DC resistance meter 18 and the insulation resistance meter 21 are respectively connected to the torsion end cable tail line 12 and the tension end cable tail line 14 to monitor the changes of the conductor resistance and the insulation resistance in the umbilical cable 9.

[0042] Example 4

[0043] This embodiment provides a method for applying axial tension test under the condition of constrained torsion of the umbilical cable assembly. The torsion device 5 locks the second flange 7 by means of gears or pulleys to limit the rotation of the torsion end of the umbilical cable 9. The tensile machine 2 is started to apply axial tension to the umbilical cable 9. By applying different tension values, the torque values ​​generated by different tensions can be fed back through the torsion device 5. At the same time, the photoelectric signal in the umbilical cable can be monitored in real time while gradually increasing the tension value. The specific monitoring method is the same as that in Example 3.

[0044] Example 5

[0045] This embodiment provides a method for testing an axial tension applied under a specified torsion angle of the umbilical cable. The torsion device 5 is connected to the second flange 7 by means of gears or pulleys, the torsion device 5 is started, the second flange 7 is rotated to a specified angle, and the tensile machine 2 is started to apply an axial tension to the umbilical cable 9. By applying different tension values, the torque values ​​generated by different tensions can be fed back through the torsion device 5. At the same time, the photoelectric signal in the umbilical cable can be monitored in real time while gradually increasing the tension value. The specific monitoring method is the same as that in Example 3.

[0046] Example 6

[0047] This embodiment provides a test method for applying a specified torque or torsion angle under zero axial tension of the umbilical cable, by adjusting the tensile machine 2 to make the axial tension of the umbilical cable 9 zero or close to zero, and keep the umbilical cable 9 horizontal. Start the torsion device 5, apply torque to the second flange 7, slowly twist the umbilical cable 9 to a certain angle or torque, and synchronously monitor the photoelectric signal in the umbilical cable 9. The specific monitoring method is the same as that in Example 3.

[0048] Example 7

[0049] This embodiment provides a test method for applying a specified torque or torsion angle under a specified axial tension of the umbilical cable, and the umbilical cable 9 is stretched to a specified tension value by adjusting the tension machine 2. Then the torsion device 5 is started to apply torque to the second flange 7, and the umbilical cable 9 is slowly twisted to a certain angle or torque, and the photoelectric signal in the umbilical cable 9 is synchronously monitored. The specific monitoring method is the same as that in Example 3.

[0050] The cable axial combination performance dynamic testing device and testing method proposed in the present invention can also be used for testing other marine flexible cables, such as submarine cables, submarine optical cables, and flexible pipes. The operation method is the same as that of the umbilical cable. The flexible pipe does not have an integrated photoelectric unit and cannot monitor the photoelectric signal. It can only measure mechanical parameters such as tension, torque, and torsion angle. The testing of different marine flexible cables using the testing device of the present invention is within the protection scope of the present invention.

[0051] Example 8

[0052] In this embodiment, the tensile stiffness test of the umbilical cable under the condition of restricted torsion and the tensile stiffness test under the condition of free torsion were carried out respectively. Since the various units in the umbilical cable, including steel pipes and fillers, are spirally wound structures, and the layers are in contact and friction with each other, the mechanical behavior is complex. The spiral winding has a great influence on the torsion, and the torsion performance of the umbilical cable has a significant impact on the engineering application of the umbilical cable. In order to measure the influence of torsion on the performance of the umbilical cable, the tensile torsion performance test of the umbilical cable was carried out.

[0053] In the tensile stiffness test under limited torsion conditions, the torsion equipment locks the second flange through the gear to limit the rotation of the torsion end of the umbilical cable. The tensile machine is started to apply and record the axial tension to the umbilical cable, increase the tension at a constant rate, and synchronously measure and record the axial elongation displacement of the umbilical cable. At the same time, the changes of other sensors are observed to prevent damage to the umbilical cable and its internal components during the test. This test is repeated three times.

[0054] In the tensile stiffness test under free torsion conditions, the torsion device is separated from the second flange so that the torsion end of the umbilical cable can rotate freely without torsion constraints. The tensile machine is started to apply axial tension to the umbilical cable, increasing the tension at a constant rate, and synchronously measuring and recording the axial elongation displacement of the umbilical cable and the angle difference formed by the first angle sensor and the second angle sensor monitored by the angle monitor. This test is repeated three times.

[0055] Through the test, the tensile performance curve of the umbilical cable under the condition of limited torsion, the tensile performance curve under the condition of free torsion, and the free torsion angle curve under different tensions are obtained, which are displayed in the form of coordinates. The test results are shown in the following figure. Figures 5 to 7 shown.

[0056] The above data provide sufficient data support for the theoretical research of umbilical cables, and provide data support for protective measures and emergency methods against the possible torsion of umbilical cables in engineering installation applications.

[0057] The above embodiments are only used to illustrate the technical solution of the present invention and are not intended to limit it. Although the present invention is described in detail with reference to the above preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention. Those skilled in the art may also make other changes within the spirit of the present invention and apply them to the design of the present invention, as long as they do not deviate from the technical effects of the present invention. These changes made according to the spirit of the present invention should be included in the scope of protection claimed by the present invention.

Claims

1. A cable axial combination performance dynamic test device, characterized in that: include A support frame (1), wherein one end of the support frame (1) is a tension end, the other end is a torsion end, and rails are provided on both sides; The stretching end is provided with a tensile machine (2), a tensile beam (3) and a tensile connection assembly, one end of the tensile machine (2) is fixed to the stretching end, and the other end is fixedly connected to the tensile beam (3), and both ends of the tensile beam (3) are slidably connected to the track; The torsion end is provided with a torsion device (5) and a torsion connection assembly; the torsion device (5) is fixed to the torsion end, and the torsion connection assembly is coupled to the torsion device (5); One end of the cable to be tested is connected to the tensile connection assembly, and the other end is connected to the torsion connection assembly; The cable is connected with a monitoring and detection system for real-time monitoring of changes in the torsion angle of the cable, changes in the optical fiber performance, changes in the conductor resistance and changes in the insulation resistance.

2. The cable axial combination performance dynamic test device according to claim 1 is characterized in that: The stretching end of the cable passes through the stretching connection assembly, and comprises a stretching end cable tail wire (14) and a stretching end optical cable tail wire (15); the monitoring and detection system comprises an insulation resistance meter (21) and an optical power meter (22); the insulation resistance meter (21) is arranged at the end of the stretching end cable tail wire (14); the optical power meter (22) is arranged at the end of the stretching end optical cable tail wire (15).

3. The cable axial combination performance dynamic test device according to claim 2 is characterized in that: The stretch connection assembly comprises a first flange (8) and a first load-bearing joint (11); one end of the first flange (8) is connected to the stretch beam (3), and the other end is connected to the first load-bearing joint (11); the stretch-end cable tail wire (14) and the stretch-end optical cable tail wire (15) pass through the first load-bearing joint (11) and extend from the side of the first flange (8).

4. The cable axial combination performance dynamic test device according to claim 1 is characterized in that: The twisted end of the cable passes through the twisted connection assembly, comprising a twisted end cable tail wire (12) and a twisted end optical cable tail wire (13); the monitoring and detection system also comprises a DC resistance meter (18) and a test light source (19); the DC resistance meter (18) is arranged at the end of the twisted end cable tail wire (12); the test light source (19) is arranged at the end of the twisted end optical cable tail wire (13).

5. The cable axial combination performance dynamic test device according to claim 4 is characterized in that: The torsion connection assembly comprises a primary connected rotation bearing (6), a second flange (7), and a second load-bearing joint (10); the torsion end of the support frame (1) is also provided with a fixed crossbeam (4); the outer side of the rotation bearing (6) is connected and fixed to the fixed crossbeam (4), and the inner side is connected to the second flange (7); one side of the second flange (7) is fixedly constrained in the front-rear direction by the fixed crossbeam (4), and the other side is freely rotatable by the rotation bearing (6).

6. The cable axial combination performance dynamic test device according to claim 1 is characterized in that: The monitoring and detection system comprises an angle monitor (20), a first angle sensor (16) and a second angle sensor (17); the first angle sensor (16) and the second angle sensor (17) are respectively tied and fixed on cables; and the angle monitor (20) is respectively connected to the first angle sensor (16) and the second angle sensor (17) via cables.

7. The cable axial combination performance dynamic test device according to claim 1 is characterized in that: The cable is integrated with a hydraulic pipeline, and both ends of the hydraulic pipeline extend out through the sides of the torsion connection component and the tension connection component respectively. Either end is sealed and the other end is connected to a water pressure device, so that the pressure state of the hydraulic pipeline can be monitored in real time while applying tension or torque.

8. A method for dynamically testing the axial combination performance of a cable, using the dynamic testing device for axial combination performance of a cable according to any one of claims 1 to 7 for testing, characterized in that: It includes the test method of applying axial tension to the cable under free torsion, the test method of applying axial tension to the cable under constrained torsion, and the test method of applying axial tension to the cable under a specified torsion angle; the test method of applying a specified torque or torsion angle to the cable under zero axial tension, and the test method of applying a specified torque or torsion angle to the cable under a specified axial tension.

9. The cable axial combination performance dynamic test method according to claim 8, characterized in that: The test method for applying axial tension when the cable is freely twisted is: S1: Disconnecting the torsion device (5) from the second flange (7) so that the torsion end of the cable can rotate freely without being constrained by torsion; S2: starting the tensile testing machine (2), and pulling the tensile beam (3) forward and backward by extending and retracting the pull rod of the tensile testing machine (2), so that the tensile beam (3) applies axial tension to the cable by driving the first flange (8) and the first load-bearing joint (11); S3: applying different pulling force values ​​to cause the cable to generate a corresponding torsion angle, measuring the torsion angle of the cable respectively by means of a first angle sensor (16) and a second angle sensor (17), and recording the relative torsion angle within a calibrated length of the cable by means of an angle monitor (20); S4: A test light source (19) is connected to the twisted end optical cable tail line (13) or the stretched end optical cable tail line (15) to provide an excitation light source, and an optical power meter (22) is connected to the stretched end optical cable tail line (15) or the twisted end optical cable tail line (13) on the other side to monitor the change in the optical fiber performance in the cable; a DC resistance meter (18) and an insulation resistance meter (21) are connected to the twisted end cable tail line (12) and the stretched end cable tail line (14) respectively to monitor the change in the conductor resistance and insulation resistance in the cable; The step S4 is to realize dynamic monitoring under different tension values ​​during the step S3, and the step S4 and the step S3 are not in any particular order; The test method for applying axial tension when the cable is torsionally constrained is: The torsion device (5) locks the second flange (7) through a gear or a pulley to limit the rotation of the torsion end of the cable; the tension machine (2) is started to apply axial tension to the cable, and different tension values ​​are applied. The torque values ​​generated by the different tensions are fed back through the torsion device (5). At the same time, the photoelectric signal in the cable is monitored in real time while the tension value is gradually increased. The real-time monitoring step is the same as step S4; The test method for applying axial tension to the cable at a specified torsion angle is: The torsion device (5) is connected to the second flange (7) via a gear or a pulley, the torsion device (5) is started, the cable is rotated to a specified angle using the second flange (7), and the tensile machine (2) is started to apply axial tension to the cable; Apply different pulling force values, and use the torsion device (5) to feed back the torque values ​​generated by the different pulling forces. At the same time, the photoelectric signal in the cable is monitored in real time while the pulling force value is gradually increased. The real-time monitoring step is the same as step S4; The test method for applying a specified torque or torsion angle to the cable under zero axial tension is: The axial tension of the cable is adjusted to zero or close to zero by adjusting the tension machine (2), and the cable is kept horizontal; the torsion device (5) is started, and the cable is subjected to torque through the second flange (7), and the cable is slowly twisted to a certain angle or torque, and the photoelectric signal in the cable is monitored in real time. The real-time monitoring step is the same as step S4; The test method for applying a specified torque or torsion angle to the cable under a specified axial tension is: The cable is stretched to a specified tension value by adjusting the tension machine (2), and then the torsion device (5) is started. The cable is subjected to torque through the second flange (7), and the cable is slowly twisted to a certain angle or torque. The photoelectric signal in the cable is monitored in real time. The real-time monitoring step is the same as step S4.

10. Use of a cable axial combination performance dynamic test device, comprising the cable axial combination performance dynamic test device according to any one of claims 1 to 7 or the cable axial combination performance dynamic test method according to claim 9, characterized in that: The cable is an umbilical cable (9) or a marine flexible pipe cable, wherein the marine flexible pipe cable includes a submarine cable, a submarine optical cable, and a flexible pipe.

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