Submarine cable anti-suspension protection and detection device based on optical fiber sound wave vibration sensing

Abstract

The invention relates to the technical field of submarine cable laying, and discloses a submarine cable anti-suspension protection and detection device based on optical fiber sound wave vibration sensing, and the device monitors the vibration data of a submarine cable in real time through an optical fiber sound wave vibration sensing system, analyzes the vibration characteristics, and precisely judges whether the submarine cable is suspended or not and the suspension length. In an anti-suspension protection structure of the linkage device, two rows of symmetrical bases and inhaul cable mechanisms on the bases are arranged, through the design that one ends of cables are wound around the bases, and the other ends of the cables fix the submarine cables, the cables are tightened to dynamically adjust the tightening degree and the position of the submarine cables so as to improve the suspension state; and finally, the related problems of insufficient linkage of an existing submarine cable fixing device and a fault detection system and the like are solved. The submarine cable suspension detection device has a submarine cable suspension detection function of optical fiber sound wave vibration sensing, a protection device is linked according to a detection result to improve a suspension state, and the problems that an existing submarine cable fixing device and a fault detection system are insufficient in linkage, poor in buffering performance, remarkable in water flow interference, poor in base installation adaptability and incapable of dynamically adjusting the tightening degree are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of submarine cable laying, in particular to a submarine cable anti-suspension protection and detection device based on optical fiber acoustic wave vibration sensing. BACKGROUND

[0002] The background technology focuses on the field of submarine cable protection, especially the submarine cable fixing and protection technology that cooperates with the submarine cable fault detection equipment connector. As the core infrastructure of marine energy transmission and communication, the long-term stable operation of submarine cables directly depends on reliable fixing and protection systems and accurate fault detection systems. Among them, the submarine cable fault detection equipment connector plays a key role in signal transmission and fault data feedback, and needs to be linked with the submarine cable fixing device to ensure that the detection and adjustment mechanism can be triggered in time when the submarine cable appears position abnormalities (such as suspension), so as to avoid the expansion of faults.

[0003] The current submarine cable fixing and protection technology mainly adopts "cover plate type rigid fixing" or "single base binding" scheme, which can realize basic fixing, but has many defects in complex marine environment. Combined with the application requirements of the submarine cable fault detection equipment connector, the following core problems need to be solved: The linkage of submarine cable suspension detection and adjustment is insufficient, and the existing fixing device lacks deep cooperation with the fault detection system. Even if the submarine cable fault detection equipment connector detects that the submarine cable is suspended due to foundation collapse, the fixing device cannot adjust in real time: the cover plate type fixing cannot dynamically adjust the position of the submarine cable due to its rigid structure, and the single base binding cannot change the tension of the submarine cable, resulting in that the submarine cable in the suspended state is long-term impacted by water flow, which not only easily damages the submarine cable body, but also may pull the fault detection equipment connector, affecting the stability of the detection signal transmission.

[0004] The fixing method lacks buffering performance, shortens the service life of the equipment, and the cover plate type fixing uses metal or concrete rigid structure to directly press the submarine cable. The flow impact and tidal fluctuation in the marine environment will cause hard friction between the submarine cable and the fixed structure, on the one hand accelerating the wear of the outer layer of the submarine cable, and on the other hand easily causing the connection between the fault detection equipment connector and the submarine cable to loosen; at the same time, the rigid fixing cannot absorb the impact energy, and the long-term stress accumulation will shorten the overall service life of the fixing device and the fault detection equipment, increasing the maintenance cost.

[0005] The water flow resistance significantly interferes with the fixed system. The existing fixed structure (such as large cover plate and multiple convex base) has a large projected area in water, and the water flow passing through easily generates vortex and resistance: on the one hand, the resistance will continuously impact the fixing device, which may cause the base to loosen and the foundation to further collapse; on the other hand, when the water flow swings the submarine cable, it will indirectly affect the installation accuracy of the submarine cable fault detection equipment connector, causing the detection data to deviate and unable to accurately judge the state of the submarine cable.

[0006] The adaptability of the base installation is poor, the seabed foundation environment is complex (such as the existence of rock protrusions in some areas, silt accumulation), and the existing fixed device requires the base to be accurately installed at the "preset fixed point" - if the preset point has no stable foundation (such as a soft silt area), the installation cannot be completed; and the position of the submarine cable cannot be adjusted after installation, and if the submarine cable deviates from the preset track due to laying deviation, the base needs to be adjusted, which not only increases the construction difficulty, but also may damage the connection stability of the connector of the submarine cable fault detection device due to repeated operation.

[0007] 5. The dynamic adjustment ability of the tension of the submarine cable is missing, and the length of the submarine cable may change slightly due to temperature changes (such as the expansion of the submarine cable due to the warming of seawater in summer) and tidal traction in long-term operation. The existing fixed device cannot dynamically adjust the tension: too loose may cause the submarine cable to sag and increase the risk of suspension, and too tight may cause excessive stress damage to the submarine cable; and if the tension anomaly cannot be adjusted in time, the "vibration signal" detected by the connector of the submarine cable fault detection device will be distorted, making it difficult to distinguish between tension anomaly and actual fault, and affecting the accuracy of fault judgment. SUMMARY

[0008] (I) Technical problems solved In view of the shortcomings of the prior art, the present application provides a submarine cable anti-suspension protection and detection device based on optical fiber acoustic wave vibration sensing, which uses an optical fiber acoustic wave vibration sensing system to monitor the suspension state of the submarine cable, and then adjusts the anti-suspension protection device to improve the suspension state of the submarine cable. It has the advantages of adjustable submarine cable tension, buffering effect, small water flow resistance, easy installation, solves the problems of insufficient linkage of existing submarine cable fixing device and fault detection system, lack of buffering performance, significant water flow interference, poor base installation adaptability and inability to dynamically adjust the tension.

[0009] (II) Technical solutions To achieve the above-mentioned purpose, the present application provides the following technical solutions: A detection device based on optical fiber acoustic wave vibration sensing is composed of three parts: a simulation module, a distributed optical fiber acoustic wave vibration monitoring system and a data processing module, which cooperatively realize accurate monitoring of the suspension state and length of the submarine cable.

[0010] A submarine cable anti-suspension protection device based on optical fiber acoustic wave vibration sensing is used to fix the submarine cable on the foundation, which includes two rows of bases fixed on the foundation, the submarine cable passes between the two rows of bases, each base is provided with another corresponding base at a symmetrical position relative to the submarine cable, the base is provided with a cable mechanism, the cable mechanism includes a cable, one end of the cable is wound in the base, the other end is fixed on the submarine cable, the cable is tightened by the cable mechanism, and the tension and position of the submarine cable are adjusted.

[0011] Preferably, the base is installed in the installation hole arranged on the foundation, the base comprises a T-shaped cylinder, a counterweight and a movable block, the T-shaped cylinder comprises a horizontal cross cylinder and a vertical vertical cylinder, the cross cylinder and the vertical cylinder form a T shape, the cross cylinder is located at the bottom of the installation hole, the counterweight is sleeved outside the vertical cylinder, the outside of the counterweight is matched with the inside of the installation hole, the movable block comprises an inner cylinder at the bottom and a dome at the top, the inner cylinder is inserted into the vertical cylinder, and the dome is located at the top of the base.

[0012] Preferably, the cable mechanism comprises a winding device arranged in the cross cylinder, the winding device comprises a winding motor and a winding drum, the winding drum is used for winding the cable, and the winding motor is fixed in the cross cylinder.

[0013] Preferably, the movable block is provided with a displacement sensor, the inner cylinder is provided with a lock plate and a lock column, the lock plate comprises two symmetrical pressing plates which are rotationally connected in the movable block, the rotationally connected point on the pressing plate is higher than the contact point of the pressing plate and the submarine cable, the pressing plate of the lock plate is further provided with an inner magnetic block, and the movable block is provided with a lock plate electromagnetic device corresponding to the position of the inner magnetic block; the lock column comprises a plurality of bolts which are circumferentially arranged on the movable block and slidably arranged in the movable block, and the movable block is provided with a lock column electromagnetic device corresponding to the position of the bolt; the winding drum is provided with a telescopic lock block, and the end of the cable is fixed on the lock block.

[0014] Preferably, the movable block is further provided with a submarine cable fault detection device connector, which is used for transmitting fault signals to the outside.

[0015] Preferably, the submarine cable is fixed with a fixing device, the end of the cable is fixed on the fixing device so as to be fixed with the submarine cable, the fixing device comprises a fixing ring, the fixing ring comprises two half rings which are fixed by bolts so as to clamp the fixing ring outside the submarine cable, a connecting plate is fixed on the fixing ring by bolts, and the connecting plate is provided with a through hole for the cable.

[0016] Preferably, the fixing device is provided with two fixing rings, and the fixing device is further provided with a power taking ring, the power taking ring is located between the two fixing rings.

[0017] Preferably, the power taking ring is a waterproof power taking device, the power taking ring is used for extracting electricity on the submarine cable and providing electricity to the base; the power taking ring is connected to the movable block by wires, the movable block and the T-shaped cylinder are electrically connected through electrode contact, and the T-shaped cylinder supplies electricity to the winding device.

[0018] Preferably, the base comprises two T-shaped cylinders, two movable blocks, one counterweight and two cables, and two fixing devices fixed with the two cables are respectively located on the front and rear sides of the base.

[0019] (Three) beneficial effects Compared with the prior art, the application provides a submarine cable anti-hanging protection and detection device based on optical fiber acoustic wave vibration sensing, which has the following beneficial effects: 1. The submarine cable anti-hanging protection and detection device based on optical fiber acoustic wave vibration sensing, by setting two rows of bases, uses the cable-stayed mechanism on the base to fix the submarine cable, which can tighten the submarine cable and adjust the tightness of the submarine cable, the fixing mode of the cable-stayed mechanism is more elastic than the cover plate type fixing mode, which has a buffering effect and prolongs the service life of the device, the cable-stayed mechanism can combine optical fiber acoustic wave vibration sensing to adjust the tightness of the submarine cable in real time, the resistance of the cable in water is small, and the impact force of the water flow is small, the base is easy to install, which is equivalent to directly fixing the submarine cable on the foundation, the base does not need to accurately fix the submarine cable at a specific position, and the position of the submarine cable can be adjusted by the cable-stayed mechanism, avoiding the lack of fixed foundation at some fixed positions.

[0020] 2. The submarine cable anti-hanging protection and detection device based on optical fiber acoustic wave vibration sensing, by setting a counterweight on the base, the T-shaped cylinder is fixed by the weight of the counterweight, which is simple and convenient to install, and the installation between the T-shaped cylinder, the counterweight and the movable block does not require tools, is stable and not easy to fall off, compared with the traditional way of fixing by bolts, this way uses the weight of the counterweight and the friction force of the counterweight in the installation hole to fix the base, reduces the falling off of the base due to geological loosening, and improves the stability of the device.

[0021] 3. The submarine cable anti-hanging protection and detection device based on optical fiber acoustic wave vibration sensing, a lock plate for fixing the submarine cable and a lock column for fixing the movable block are arranged in the movable block, a lock block for fixing the cable is arranged on the winding device, when the foundation moves or the base falls off from the foundation, the movable block is fixed on the cable and separated from the base, which avoids the base moving or the geological movement tearing the submarine cable, the movable block is hung at the bottom of the submarine cable through the cable, which has the effect of weight increasing and shockproof, and when the movable block is hung at the bottom of the submarine cable, the submarine cable fault detection equipment connector in the movable block can continuously transmit fault signals to the outside. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the application.

[0023] Figure 2 It is a structural schematic diagram of the foundation of the application.

[0024] Figure 3 It is a structural schematic diagram of the fixing device of the application.

[0025] Figure 4 Structure diagram of the base of the present application.

[0026] Figure 5 Sectional view of the base of the present application.

[0027] Figure 6 Exploded view of the base of the present application.

[0028] Figure 7 Sectional view of the T-shaped cylinder of the present application.

[0029] Figure 8 Structure diagram of the winding device of the present application.

[0030] Figure 9 Structure diagram of the movable block of the present application.

[0031] Figure 10 Sectional view of the movable block of the present application.

[0032] Figure 11 Principle diagram of the optical fiber acoustic vibration sensing system for detecting submarine cable.

[0033] In the figure: 1, foundation; 2, submarine cable; 3, base; 4, cable; 5, fixing device; 11, mounting hole; 31, T-shaped cylinder; 311, horizontal cylinder; 312, vertical cylinder; 313, winding device; 3131, winding motor; 3132, winding cylinder; 3133, locking block; 32, counterweight block; 33, movable block; 331, inner cylinder; 332, dome; 333, locking column; 334, locking column electromagnetic device; 335, locking plate; 3351, inner magnetic block; 336, locking plate electromagnetic device; 3321, outer magnetic block; 51, fixing ring; 52, power taking ring; 53, connecting plate. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0035] In the description of the present application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0036] In addition, the fixed connection refers to the connection after fixing the parts or components without any relative movement; the transmission connection refers to a connection mode of transmitting mechanical movement or torque to other working components through a transmission member; the sliding connection refers to a connection mode that two objects are in contact but not fixed, and the two objects can slide relative to each other; and the rotating connection refers to a connection mode that two objects are in contact but not fixed, and the two objects can rotate relative to each other.

[0037] In addition, the terms "first" and "second" are only used for description purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0038] Embodiment one: The embodiment provides a submarine cable anti-suspension protection and detection device based on optical fiber acoustic wave vibration sensing, which has the following technical features.

[0039] Please refer to Figure 11 A detection device based on optical fiber acoustic wave vibration sensing is composed of three parts: a simulation module, a distributed optical fiber acoustic wave vibration monitoring system, and a data processing module. The three parts work together to accurately monitor the suspension state and length of the submarine cable.

[0040] Please refer to Figures 1-10 A submarine cable anti-suspension protection and detection device based on optical fiber acoustic wave vibration sensing is used to fix the submarine cable 2 on the foundation 1, which includes two rows of bases 3 fixed on the foundation 1, and the submarine cable 2 passes between the two rows of bases 3. Each base 3 is provided with another corresponding base 3 at a symmetrical position relative to the submarine cable 2, and a cable tensioning mechanism is arranged on the base 3. The cable tensioning mechanism includes a cable 4, one end of which is wound in the base 3, and the other end is fixed on the submarine cable 2. By tightening the cable 4 through the cable tensioning mechanism, the tightness and position of the submarine cable 2 can be adjusted.

[0041] It should be noted that when installing, the tightness of the submarine cable 2 can be adjusted by the cable tensioning mechanism on the bases 3 on both sides. When the foundation 1 partially collapses and causes the submarine cable 2 to be suspended, the submarine cable 2 is detected to be suspended by the optical fiber acoustic wave vibration sensing, and the submarine cable 2 is tightened by the cable tensioning mechanism to avoid being deviated by excessive water flow impact when suspended.

[0042] Further, the optical fiber acoustic wave vibration sensing is detected by using one core of the existing submarine cable.

[0043] In an alternative embodiment, the base 3 is installed in the installation hole 11 provided on the foundation 1, the base 3 comprises a T-shaped cylinder 31, a counterweight 32 and a movable block 33, the T-shaped cylinder 31 comprises a horizontal cross cylinder 311 and a vertical vertical cylinder 312, the cross cylinder 311 and the vertical cylinder 312 form a T shape, wherein the cross cylinder 311 is located at the bottom of the installation hole 11, the counterweight 32 is sleeved outside the vertical cylinder 312, the outside of the counterweight 32 is matched with the inside of the installation hole 11, and the movable block 33 comprises an inner cylinder 331 at the bottom and a dome 332 at the top, the inner cylinder 331 is inserted into the vertical cylinder 312 downward, and the dome 332 is located at the top of the base 3.

[0044] It should be noted that during installation, first, a hole is formed in the foundation 1 to form the installation hole 11, then the counterweight 32 is sleeved on the T-shaped cylinder 31, then the movable block 33 is inserted on the T-shaped cylinder 31, and finally the installed base 3 is directly placed in the installation hole 11, and the weight of the counterweight 32 is used to fix the base 3.

[0045] Further, the counterweight 32 is made of concrete.

[0046] In an alternative embodiment, the cable mechanism comprises a winding device 313 arranged in the cross cylinder 311, the winding device 313 comprises a winding motor 3131 and a winding drum 3132, the winding drum 3132 is used for winding the cable 4, and the winding motor 3131 is fixed in the cross cylinder 311.

[0047] In an alternative embodiment, the movable block 33 is provided with a displacement sensor, the inner cylinder 331 is provided with a lock plate 335 and a lock column 333, the lock plate 335 comprises two symmetrical pressing plates rotatably connected in the movable block 33, the rotation connection point on the pressing plate is higher than the contact point between the pressing plate and the submarine cable 2, and the pressing plate of the lock plate 335 is further provided with an inner magnetic block 3351, and the movable block 33 is provided with a lock plate electromagnetic device 336 at a position corresponding to the inner magnetic block 3351. The lock column 333 comprises a plurality of bolts circumjacent to the movable block 33, the bolts are slidingly arranged in the movable block 33, and the movable block 33 is provided with a lock column electromagnetic device 334 at a position corresponding to the bolts. The winding drum 3132 is provided with a telescopic lock block 3133, and the end of the cable 4 is fixed on the lock block 3133.

[0048] Further, the lock block 3133 is controlled to be telescopic by an electromagnetic device, the end of the cable 4 is annular, and the end of the cable 4 is sleeved on the lock block 3133.

[0049] It should be noted that when installing, the lock post electromagnetic device 334 is passed through a positive current to make the lock post electromagnetic device 334 adsorb the lock post 333, so that the lock post 333 is hidden in the movable block 33. At this time, the inner cylinder 331 can be smoothly inserted into the vertical cylinder 312. After insertion, a reverse current is passed through the lock post electromagnetic device 334 to make the lock post electromagnetic device 334 repel the lock post 333, so that the lock post 333 protrudes from the movable block 33, thereby fixing the movable block 33 in the T-shaped cylinder 31.

[0050] It should be noted that when the cable mechanism is working, the lock plate electromagnetic device 336 adsorbs the inner magnetic block 3351 to make the lock plate 335 separate from the submarine cable 2, so that the submarine cable 2 can freely stretch and retract. When the cable mechanism stops working, the lock plate electromagnetic device 336 repels the inner magnetic block 3351 to make the inner magnetic block 3351 clamp the submarine cable 2 to prevent the submarine cable 2 from extending outward.

[0051] It should be noted that when the displacement sensor detects that the base 3 moves, it indicates that the foundation 1 may have undergone geological changes, or the base 3 may have fallen off the foundation 1. At this time, the lock plate electromagnetic device 336 is controlled to make the lock plate 335 clamp the submarine cable 2, the lock post electromagnetic device 334 is controlled to make the lock post 333 retract into the movable block 33, the lock block 3133 is controlled to retract, the end of the cable 4 is separated from the winding cylinder 3132, and the winding motor 3131 is controlled to pay out the cable. Finally, the movable block 33 is fixed on the cable 4 to separate from the base 3.

[0052] Further, the side of the dome 332 is also provided with an outer magnetic block 3321.

[0053] It should be noted that when the two movable blocks 33 are hung together at the same time, they are adsorbed together by the outer magnetic block 3321.

[0054] In an optional embodiment, the movable block 33 is also provided with a subsea cable fault detection device connector for transmitting fault signals to the outside world.

[0055] It should be noted that after the movable block 33 separates from the counterweight block 32, the T-shaped cylinder 31 is powered off, and the movable block 33 is still connected to the power taking ring 52 for power supply.

[0056] In an optional embodiment, the submarine cable 2 is fixed with a fixing device 5, and the end of the cable 4 is fixed on the fixing device 5 to be fixed with the submarine cable 2. The fixing device 5 includes a fixing ring 51, and the fixing ring 51 includes two half rings which are fixed by bolts to clamp the fixing ring 51 outside the submarine cable 2. The fixing ring 51 is fixed with a connecting plate 53 by bolts, and the connecting plate 53 is provided with a through hole for passing through the cable 4.

[0057] It should be noted that the fixing device 5 and the two bases 3 fixed with the fixing device 5 form a triangle.

[0058] In an optional embodiment, the base 3 comprises two T-shaped cylinders 31, two movable blocks 33, a counterweight 32 and two cables 4, and two fixed devices 5 connected with the two cables 4 are respectively located on the front and rear sides of the base 3.

[0059] It should be noted that the two fixed devices 5 and the two bases 3 fixed with the fixed devices 5 form a quadrilateral structure.

[0060] Further, the submarine cable fault detection device connector comprises a waterproof signal interface and a wireless transmission module. The waterproof signal interface is connected with the signal core of the submarine cable 2 through a shielded cable. The wireless transmission module transmits the fault signal to the shore-based monitoring terminal in a water acoustic communication or underwater electromagnetic induction communication mode. The outer side of the dome 332 of the movable block 33 is wrapped with a corrosion-resistant coating, which is made of polytetrafluoroethylene or ceramic coating.

[0061] It should be noted that the corrosion-resistant design is added to adapt to the complex submarine environment and solve the problems of unclear transmission of fault signals and easy corrosion of the structure.

[0062] Further, the inner wall of the mounting hole 11 is provided with an annular anti-skid groove, and the outer side of the counterweight 32 is provided with an elastic protrusion corresponding to the position of the annular anti-skid groove. The elastic protrusion is made of rubber material and is clamped in the annular anti-skid groove. The bottom of the counterweight 32 is further provided with a buffer pad layer made of polyurethane foam material, and the buffer pad layer is attached to the bottom of the mounting hole 11.

[0063] It should be noted that the connection stability of the counterweight and the mounting hole is enhanced by the "anti-skid groove + elastic protrusion", and the buffer pad layer is used to absorb geological vibration or water flow impact, thereby solving the problem of insufficient stability of the base relying only on friction force.

[0064] Further, the submarine cable fault detection device further comprises an optical fiber acoustic vibration sensing assembly. The optical fiber acoustic vibration sensing assembly comprises a distributed optical fiber sensor and a control module. The distributed optical fiber sensor is laid along the length direction of the submarine cable 2, and the signal output end of the distributed optical fiber sensor is electrically connected with the control module. The control module is fixed in the movable block 33, and the control module is electrically connected with the winding motor 3131. When the distributed optical fiber sensor detects that the vibration frequency of the submarine cable 2 exceeds a preset threshold value, the control module drives the winding motor 3131 to rotate, so as to adjust the tightness of the cable 4.

[0065] It should be noted that the specific structure, installation position and control logic of the optical fiber acoustic vibration sensing assembly and the cable mechanism are specified, the "sensing-detection-adjustment" closed loop is completed, and the problem of lack of correlation between the sensing device and the actuator is solved.

[0066] Further setting, the inner wall of the fixing ring 51 is provided with an anti-skid rubber pad, an arc-shaped groove is formed in the inner side of the anti-skid rubber pad, and the arc-shaped groove is attached to the outer wall of the submarine cable 2; the through hole of the connecting plate 53 is provided with a wear-resistant sleeve, the wear-resistant sleeve is made of stainless steel, and the rope 4 is arranged in the wear-resistant sleeve.

[0067] Need to be explained, the anti-skid rubber pad enhances the fit of the fixing ring and the submarine cable, avoiding the submarine cable from sliding; the wear-resistant sleeve reduces the friction loss between the rope and the connecting plate, prolongs the service life of the rope, and solves the problem of easy slipping of the fixing device and easy wear of the rope in the original scheme.

[0068] Further setting, the optical fiber acoustic vibration sensing is composed of a simulation module, a distributed optical fiber acoustic vibration monitoring system and a data processing module, and the three parts cooperate to realize accurate monitoring of the submarine cable suspension state and suspension length.

[0069] Specifically, the simulation module first obtains the inherent frequency and mode of the submarine cable in water through ANSYSWorkbench platform by doing wet modal analysis (building a submarine cable solid domain and fluid domain model, setting a parameter boundary, and fluid-structure coupling calculation), then determines the resonance frequency by doing acoustic harmonic response analysis, repeatedly simulates the vibration frequency of different suspension lengths, and finally obtains the “suspension length-vibration frequency” relationship.

[0070] Specifically, the distributed optical fiber acoustic vibration monitoring system includes a narrow linewidth laser (producing 1550nm, 3kHz linewidth, 20mw power laser), a fiber coupler (dividing optical signals), an acousto-optic modulator (modulating optical signals) and other components, and the components work together: after the laser is divided, modulated and amplified, it is transmitted into the submarine cable fiber to be tested, and then the Rayleigh scattering signal of the optical fiber is received, and after filtering, detection and conversion, the vibration curve of the submarine cable fiber is obtained by the acquisition module.

[0071] Specifically, the data processing module substitutes the obtained vibration curve into the “suspension length-vibration frequency” relationship simulated in advance to predict whether the submarine cable is suspended and the suspension length, realizing high-precision, low-cost and real-time monitoring.

[0072] Further setting, the cooperation and linkage method of the optical fiber acoustic vibration sensing system and the submarine cable suspension protection device includes: Signal transmission and triggering mechanism: the data analysis module of the fiber optic acoustic vibration sensing system and the controller of the protection device communicate with each other through Ethernet. When the sensing system determines that the submarine cable is suspended, it will immediately send a digital signal containing the suspension parameters (position, length, risk level) to the central controller. After receiving the signal, the controller first checks the signal (to avoid false triggering caused by transmission interference), and then triggers the corresponding protection action according to the preset linkage logic, such as triggering the local cable adjustment mechanism for low-risk suspension, and starting multiple cable adjustment mechanisms for high-risk suspension. The triggering time and suspension parameters are recorded synchronously to facilitate subsequent operation and maintenance.

[0073] Differential protection control based on suspension parameters: the central controller accurately controls the cable adjustment mechanism on the base in the corresponding area according to the suspension length feedback from the sensing system, achieving on-demand adjustment. Suspension position positioning and cable selection: the sensing system determines the specific position of the suspended section (such as the 100-102m section of the submarine cable) through distributed monitoring, and the controller selects the base on both sides of the section (such as the left base at 100m and the right base at 102m) accordingly, and only starts the cable adjustment mechanism on these bases, avoiding energy waste and excessive pulling of the submarine cable caused by unrelated mechanism action. Dynamic adjustment of cable tension: set the tension value of the cable according to the suspension length to ensure that the submarine cable is moderately tightened to eliminate the suspension. During the adjustment process, the sensing system continuously monitors the vibration frequency of the submarine cable, and sends a "adjustment complete" signal to the controller when the frequency returns to the normal range. The central controller then controls the cable adjustment mechanism to stop winding and lock the cable position, completing the protection action. State feedback after adjustment and secondary optimization: after the protection device performs cable adjustment, the fiber optic acoustic vibration sensing system will perform secondary detection on the state of the submarine cable. If the vibration frequency has returned to normal, it is determined that the protection is successful, and the controller records the execution parameters of this protection (cable tension, adjustment time, final state). If secondary detection still finds that there is partial suspension (such as local sections that have not been completely eliminated due to irregular foundation collapse), the sensing system will generate revised suspension parameters and feed them back to the central controller. The controller adjusts the action of the cable adjustment mechanism according to the new parameters (such as increasing the cable tension of adjacent bases or fine-tuning the cable winding length), until the submarine cable returns to normal state, forming a closed-loop control of "detection-adjustment-re-detection-re-optimization", ensuring the reliability of the protection effect.

[0074] Emergency linkage under abnormal conditions. When the sensing system detects extreme conditions, in addition to triggering the emergency tightening of the cable, it will also send an "emergency signal" to the central controller. The controller will then start the sound and light alarm device (installed on the shore operation station or offshore platform) and push the warning information (including real-time monitoring data and on-site location) to the mobile APP of the operation personnel. At the same time, the sensing system will increase the sampling frequency to 200 kHz to strengthen the monitoring of the submarine cable vibration state and continuously feed back data to the controller to provide real-time dynamic support for the on-site disposal of the operation personnel, avoiding further expansion of the accident.

[0075] Embodiment two: The embodiment provides a submarine cable anti-hanging protection and detection device based on optical fiber acoustic wave vibration sensing. In addition to the technical solution of embodiment one, the device has the following technical features.

[0076] In an optional embodiment, two fixing rings 51 are arranged on the fixing device 5, and a power taking ring 52 is further arranged on the fixing device 5, and the power taking ring 52 is located between the two fixing rings 51. The power taking ring 52 is a waterproof power taking device, and is used to extract power on the submarine cable 2 and provide the power to the base 3. The power taking ring 52 is connected to the movable block 33 through an electric wire, and the movable block 33 is electrically connected to the T-shaped cylinder 31 through electrode contact, and the T-shaped cylinder 31 supplies power to the winding device 313.

[0077] Further, a waterproof sealing assembly is arranged at the electrode contact part between the movable block 33 and the T-shaped cylinder 31, and the waterproof sealing assembly comprises a sealing ring and conductive paste. The sealing ring is sleeved outside the electrode, and the conductive paste is filled between the electrode and the contact end. A backup battery is further arranged in the movable block 33, and the backup battery is electrically connected to the power taking ring 52. When the power supply of the power taking ring 52 is interrupted, the backup battery supplies power to the winding device 313, the displacement sensor and the fault detection equipment, and the endurance time is not less than 72 hours.

[0078] It should be noted that the waterproof sealing structure of the optimized electrode contact and the power supply of the device solve the problems of poor electrode contact and low power supply reliability under water, and ensure the normal operation of the device in the event of power failure.

[0079] Embodiment three: The embodiment provides a submarine cable anti-hanging protection and detection device based on optical fiber acoustic wave vibration sensing. In addition to the technical solution of embodiment one, the device has the following technical features.

[0080] In an optional embodiment, a backup battery is arranged in the movable block 33 and the T-shaped cylinder 31 respectively, and a water current power generation device is further arranged at the top of the base 3. The water current power generation device generates power by using the submarine water current to supplement the power of the backup battery.

[0081] Further provided, the top of the dome 332 of the base 3 is fixed with a water flow power generation device, the water flow power generation device comprises a flow guide cover, an impeller, a generator and a rectifier and voltage stabilizing module; the flow guide cover is a conical structure with open ends, the large-diameter end faces the water flow direction, and the small-diameter end faces away from the water flow direction, the impeller is rotationally arranged in the flow guide cover, and the rotating shaft of the impeller is coaxially fixed with the input shaft of the generator; the generator and the rectifier and voltage stabilizing module are fixed in the mounting groove at the top of the dome 332, the input end of the rectifier and voltage stabilizing module is electrically connected with the generator, and the output end is electrically connected with the backup battery in the movable block 33 and the base battery in the T-shaped cylinder 31 respectively.

[0082] It should be noted that the technical solution in Example Three can be parallel to Example Two, or can exist simultaneously with Example.

[0083] In summary, the submarine cable anti-hanging protection and detection device based on optical fiber acoustic wave vibration sensing, by setting two rows of bases 3, uses the cable-stayed mechanism on the base 3 to fix the submarine cable 2, first, the symmetrical cable-stayed mechanism can tighten the submarine cable 2, adjusting the tightness of the submarine cable 2; second, the fixing method of the cable-stayed mechanism is more flexible than the cover plate type fixing method, which has a buffering effect and prolongs the service life of the device; third, the cable-stayed mechanism can combine optical fiber acoustic wave vibration sensing to adjust the tightness of the submarine cable 2 in real time; fourth, the resistance of the cable in water is small, and the impact force of the water flow is small; fifth, the base 3 is easy to install, which is equivalent to directly fixing the submarine cable 2 on the foundation 1, and the base 3 does not need to accurately fix the submarine cable 2 at a specific position, and the position of the submarine cable 2 can be adjusted by the cable-stayed mechanism, avoiding the lack of fixed foundation at some fixed positions.

[0084] The submarine cable anti-hanging protection and detection device based on optical fiber acoustic wave vibration sensing, by setting a counterweight 32 on the base 3, uses the weight of the counterweight 32 to fix the T-shaped cylinder 31, first, the installation is simple and convenient, and the installation between the T-shaped cylinder 31, the counterweight 32 and the movable block 33 does not require tools; second, it is stable and not easy to fall off, compared with the traditional method of fixing by bolts, this method uses the weight of the counterweight 32 and the friction force of the counterweight 32 in the mounting hole 11 to fix the base 3, reducing the falling of the base 3 due to geological loosening and improving the stability of the device.

[0085] The submarine cable anti-hanging protection and detection device based on the optical fiber acoustic wave vibration sensing, the lock plate 335 for fixing the submarine cable 2 and the lock column 333 for fixing the movable block 33 are arranged in the movable block 33, the lock block 3133 for fixing the cable 4 is arranged on the winding device 313, when the foundation 1 moves or the base 3 falls off from the foundation 1, the movable block 33 is fixed on the cable 4 and separated from the base 3, first, the base 3 is prevented from moving or the geological movement from tearing the submarine cable 2; second, the movable block 33 is hung on the bottom of the submarine cable 2 through the cable 4, and the effect of weight and shock absorption is achieved; third, when the movable block 33 is hung on the bottom of the submarine cable 2, the submarine cable fault detection equipment connector in the movable block 33 can continuously transmit the fault signal to the outside.

[0086] It should be noted that the relational terms herein such as first and second and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any such actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element preceded by "comprises... a" does not, without more limitations, foreclose the existence of additional identical elements in the process, method, article, or apparatus that comprises the recited element.

[0087] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, alternatives, and variations can be made in the embodiments without departing from the spirit and scope of the present application as defined by the appended claims and their equivalents.

Claims

1. A detection device based on optical fiber acoustic wave vibration sensing, characterized in that: The simulation module, the distributed optical fiber acoustic vibration monitoring system and the data processing module are cooperated to realize accurate monitoring of the suspension state and the suspension length of the submarine cable.

2. The submarine cable anti-suspension protection device based on the optical fiber acoustic vibration sensing, based on the detection device based on the optical fiber acoustic vibration sensing in claim 1, is used for fixing the submarine cable (2) on the ground foundation (1), and is characterized by comprising: two rows of bases (3) fixed on the ground foundation (1), wherein the submarine cable (2) passes between the two rows of bases (3), and each base (3) is provided with another corresponding base (3) at a symmetrical position relative to the submarine cable (2); a cable tensioning mechanism is arranged on the base (3), the cable tensioning mechanism comprises a cable (4), one end of the cable (4) is wound in the base (3), and the other end of the cable (4) is fixed on the submarine cable (2), the cable (4) is tensioned through the cable tensioning mechanism, and the tension and position of the submarine cable (2) are adjusted.

3. The anti-spanning protection device for submarine cable based on fiber optic acoustic vibration sensing according to claim 2, characterized in that, The base (3) is installed in the mounting hole (11) arranged on the ground foundation (1), and the base (3) comprises a T-shaped cylinder (31), a counterweight (32) and a movable block (33). The T-shaped cylinder (31) comprises a horizontal horizontal cylinder (311) and a vertical vertical cylinder (312), the horizontal cylinder (311) and the vertical cylinder (312) are in T-shaped, the horizontal cylinder (311) is located at the bottom of the mounting hole (11), the counterweight (32) is sleeved outside the vertical cylinder (312), the outside of the counterweight (32) is attached to the inside of the mounting hole (11), and the movable block (33) comprises an inner cylinder (331) at the bottom and a dome (332) at the top.

4. The anti-spanning protection device for submarine cable based on fiber optic acoustic vibration sensing according to claim 3, characterized in that, The cable tensioning mechanism comprises a winding device (313) arranged in the horizontal cylinder (311), the winding device (313) comprises a winding motor (3131) and a winding drum (3132), the winding drum (3132) is used for winding the cable (4), and the winding motor (3131) is fixed in the horizontal cylinder (311).

5. The anti-spanning protection device for submarine cable based on fiber optic acoustic vibration sensing according to claim 4, characterized in that, A displacement sensor is arranged in the movable block (33), and a lock plate (335) and a lock column (333) are arranged in the inner cylinder (331). The lock plate (335) comprises two symmetrical pressing plates rotatably connected in the movable block (33), the rotation connection point on the pressing plate is higher than the contact point between the pressing plate and the submarine cable (2), and an inner magnetic block (3351) is further arranged on the pressing plate of the lock plate (335). The lock column (333) comprises a plurality of bolts circumjacent to the movable block (33), the bolts are slidingly arranged in the movable block (33), and the movable block (33) is provided with a lock column electromagnetic device (334) corresponding to the position of the bolts. A telescopic lock block (3133) is arranged on the winding drum (3132), and the end of the cable (4) is fixed on the lock block (3133).

6. The anti-spanning protection device for submarine cable based on fiber optic acoustic vibration sensing according to claim 5, characterized in that, The active block (33) is further provided with a submarine cable fault detection device connector for transmitting a fault signal to the outside.

7. The anti-spanning protection device for submarine cable based on fiber optic acoustic vibration sensing according to claim 5, characterized in that, The submarine cable (2) is fixed with a fixing device (5), and the end of the cable (4) is fixed on the fixing device (5) to be fixed with the submarine cable (2); the fixing device (5) comprises a fixing ring (51), the fixing ring (51) comprises two half rings, the two half rings are fixed by bolts to clamp the fixing ring (51) outside the submarine cable (2), and the fixing ring (51) is fixed with a connecting plate (53) by bolts, and the connecting plate (53) is provided with a through hole for the cable (4) to pass through.

8. The anti-spanning protection device for submarine cable based on fiber optic acoustic vibration sensing according to claim 7, characterized in that, The fixing device (5) is provided with two fixing rings (51), and the fixing device (5) is further provided with a power taking ring (52), and the power taking ring (52) is located between the two fixing rings (51).

9. The anti-spanning protection device for submarine cable based on fiber optic acoustic vibration sensing according to claim 8, characterized in that, The power taking ring (52) is a waterproof power taking device, and the power taking ring (52) is used for extracting power on the submarine cable (2) and providing the base (3); The power taking ring (52) is connected to the active block (33) by wires, and the active block (33) and the T-shaped cylinder (31) are electrically connected by electrode contact, and the T-shaped cylinder (31) supplies power to the winding device (313).

10. The anti-spanning protection device for submarine cable based on fiber optic acoustic vibration sensing according to claim 5, characterized in that, The base (3) comprises two T-shaped cylinders (31), two active blocks (33), a counterweight (32) and two cables (4), and the two fixing devices (5) fixed with the two cables (4) are respectively located on the front and rear sides of the base (3).

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