Ship tail moon pool wave absorbing system

Abstract

The invention relates to the field of underwater vehicle wave collecting and releasing design, and discloses a ship tail moon pool wave absorbing system which comprises a ship, the ship tail is provided with a collecting and releasing operation command room, a moon pool and a wave absorbing equipment room, the wave absorbing equipment room is close to the moon pool, and the ship tail moon pool wave absorbing system further comprises a flow direction and flow speed sensor, a wave absorbing centralized control facility, a ship-borne air compressor and a bubble generating device. The flow direction and flow velocity sensor is arranged in the middle of the bottom of the ship, the wave absorbing centralized control facility is arranged in a collecting and releasing operation command room, the shipborne air compressor is arranged in a wave absorbing equipment room, and the bubble generating device can form a bubble curtain wall with a certain width at the middle rear part of a moon pool. According to the method, the bubble curtain wall is generated in the moon pool, wave making in the moon pool is reduced, the sea condition in the open moon pool is improved, a guarantee can be provided for safe retracting and releasing operation of a scientific investigation underwater vehicle, the safety and reliability of retracting and releasing operation of the underwater vehicle are guaranteed, the operation difficulty is reduced, the attitude of the underwater vehicle is prevented from being out of control, and personnel safety is guaranteed.

Description

Technical Field

[0001] The invention relates to the field of submersible wave retraction and deployment design, and in particular to a ship stern moon pool wave absorption system. Background Art

[0002] The 21st century is the century of the ocean. Scientific research ships are one of the key means for my country to carry out marine scientific research missions. They not only shoulder special tasks such as investigating and studying ocean hydrology, geology, and biology, but also provide professional on-site support services for scientific research submersibles. Therefore, the ability to safely retract and launch scientific research submersible equipment is an important consideration in the design of scientific investigation ships.

[0003] In order to have the function of retracting and launching large scientific research submersibles, such scientific support ships often have an open moon pool structure at the rear. The rear moon pool is an open space. The environmental sea conditions, the movement of submersible equipment when entering and leaving the moon pool, and the movement of the hull itself will make the sea conditions in the moon pool more complicated; coupled with the influence of the moon pool wall and the superposition of waves, it is possible to stir up waves of a certain amplitude, increase the movement of the submersible equipment in the moon pool, cause mutual collision with the moon pool wall, cause the submersible to be damaged, and cannot operate normally, further affecting the safety of scientific research personnel.

[0004] In order to ensure the safe retrieval and launch of scientific research submersibles, scientific research support ships need to have a certain moon pool wave absorption capability to reduce waves in the moon pool, and be used in conjunction with a professional retrieval and launch system to ensure the safety of the retrieval and launch of the submersible, reduce the difficulty of the operation, avoid collision accidents between the submersible and the hull, and ensure the safety of personnel. Summary of the invention

[0005] The technical problem to be solved by the present invention is that due to the influence of the moon pool wall of the ship and the superposition of waves, waves of a certain amplitude may be stirred up, which will increase the movement of the submersible equipment in the moon pool, cause mutual collision with the moon pool wall, cause damage to the submersible, and make it unable to operate normally, thus affecting the safety of scientific research personnel.

[0006] In order to solve the above technical problems, the technical solution of the present invention is to provide a ship stern moon pool wave absorption system, including a ship, wherein the stern of the ship is provided with a retracting and launching operation command room, a moon pool and a wave absorption equipment room, wherein the wave absorption equipment room is close to the moon pool and also includes a flow direction and velocity sensor, a wave absorption centralized control facility, a ship-borne air compressor and a bubble generating device, wherein:

[0007] The flow velocity sensor is located in the middle of the bottom of the ship to measure the ship's velocity V t and the direction of seawater flow, and the ship's water speed V t and the seawater flow direction return wave-breaking centralized control facilities and the bridge;

[0008] The wave-breaking centralized control facility is arranged in the command room for the launching and retrieving operation. The wave-breaking centralized control facility is arranged according to the ship's water speed V t 2. The theoretical wave-breaking air supply is calculated based on the monthly statistics of wave wavelength λ and other data of the target sea area;

[0009] The shipboard air compressor is arranged in the wave-breaking equipment room and performs air compression according to the wave-breaking air supply volume instruction issued by the wave-breaking centralized control facility;

[0010] The bubble generating device comprises a gas pipeline and a high-pressure nozzle. The gas pipeline is connected to a ship-borne air compressor. The high-pressure nozzle is installed at the stern baseline of the ship. The high-pressure gas generated by the ship-borne air compressor is ejected along the length direction of the moon pool to generate a group of fine bubbles of a certain diameter, forming a bubble curtain wall of a certain width in the middle and rear part of the moon pool.

[0011] Optionally, it also includes an air supply valve, which is installed between the bubble generating device and the shipboard air compressor to control the air supply volume of the wave breaking system and prevent seawater from backflowing when the wave breaking system is not working.

[0012] Optionally, the theoretical air supply for wave elimination is Q0 = max{Q cr , Q m}, that is, the theoretical gas supply Q0 is Q cr , Q m The maximum value of the two is taken as the initial value of the air supply of the tail moon pool wave absorption system, where:

[0013]

[0014] g is the acceleration of gravity; P is the local atmospheric pressure; D is the depth of the high-pressure nozzle of the bubble generating device; Q cr is the air supply of the shipboard air compressor when offsetting the wave with the incident wavelength statistical value of λ; Q m The velocity of the horizontal flow is V t When , the air supply of the shipboard air compressor 3; K1 and K2 are correction coefficients.

[0015] Optionally, the ship also includes a first deck, a second deck and a lifting deck, the first deck is arranged below the second deck, the wave-breaking equipment room is arranged between the first deck and the second deck, the launching and retracting operation command room is arranged above the second deck, the lifting deck is located in the moon pool, and the lifting and lowering is monitored by the wave-breaking centralized control facility.

[0016] Optionally, the moon pool wave-breaking system at the rear of the vessel is functionally interlocked with the lifting deck, that is, the moon pool wave-breaking system can only be started when the lifting deck is lowered to less than half of the hull depth.

[0017] Optionally, the flow velocity sensor has a measurement accuracy of no more than 0.2% or 0.1 knot of the ship speed, a measurement range of -10.00 kn to 40.00 kn, and can work normally when the ship rolls 15° and pitches 5°.

[0018] Optionally, the wave-breaking centralized control facility is integrated on a control console in the rear retraction and deployment operation command room. There is a control panel on the console. The control panel displays in Chinese and has a touch screen. All functional units are equipped with corresponding buttons or knobs, and have an emergency stop button and a reset knob.

[0019] Optionally, the shipborne air compressor is equipped with a pressure gauge and a safety valve, and is provided with an adjustable parameter system and a pressure and temperature alarm system, a fault alarm system, a filter element blockage alarm system, an overload protection and a remote control system.

[0020] Optionally, the gas supply valve is an electrically controlled flow valve, which can remotely perform flow setting and switch control.

[0021] In summary, the present invention generates a bubble curtain wall in the moon pool to achieve moon pool wave absorption, reduce wave generation in the moon pool, and improve the sea conditions in the open moon pool. It can provide protection for the safe retrieval and deployment of scientific research submersibles, ensure the safety and reliability of the retrieval and deployment of submersibles, reduce the difficulty of operations, avoid loss of control of the submersible's attitude, and ensure the safety of personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of the working process of a ship stern moon pool wave absorption system provided by the present invention;

[0023] Figure 2 A side view of the arrangement of a moon pool wave-breaking system at the rear of a ship provided by the present invention;

[0024] Figure 3 A top view of the second deck arrangement of a ship stern moon pool wave-breaking system provided by the present invention;

[0025] Figure 4 A top view of a deck arrangement of a ship stern moon pool wave-breaking system provided by the present invention;

[0026] Figure 5 An operation interface diagram of a centralized wave-breaking control facility in a ship's stern moon pool wave-breaking system provided by the present invention;

[0027] In the figure: 2. Centralized control facilities for wave breaking; 3. Shipboard air compressor; 4. Bubble generating device; 5. Air supply valve; 6. Command room for retracting and launching operations; 7. Wave breaking equipment room; 8. First deck; 9. Second deck; 10. Lifting deck. DETAILED DESCRIPTION

[0028] The following combination Figure 1-5 The present invention is described in further detail.

[0029] The present invention discloses a ship stern moon pool wave absorption system, referring to Figure 2 and Figure 3 , including a ship, a command room 6 for launching and retracting operations, a moon pool and a wave-breaking equipment room 7 are arranged at the stern of the ship, the wave-breaking equipment room 7 is close to the moon pool, and also includes a flow direction and velocity sensor, a wave-breaking centralized control facility 2, a ship-borne air compressor 3, a bubble generating device 4 and an air supply valve 5, wherein,

[0030] The flow direction and velocity sensor is located in the middle of the bottom of the ship to measure the ship's water velocity Vt and the seawater flow direction, and returns the ship's water velocity Vt and the seawater flow direction to the wave-breaking centralized control facility 2 and the navigation cabin;

[0031] The wave-breaking centralized control facility 2 is arranged in the command room 6 for the launching and retracting operation. The wave-breaking centralized control facility 2 calculates the theoretical wave-breaking air supply according to the data such as the ship's water speed Vt and the wave wavelength λ obtained from the monthly statistics of the target sea area.

[0032] The shipboard air compressor 3 is arranged in the wave-breaking equipment room 7, and performs air compression according to the wave-breaking air supply quantity instruction issued by the wave-breaking centralized control facility 2;

[0033] The bubble generating device 4 includes a gas pipeline and a high-pressure nozzle. The gas pipeline is connected to the ship-borne air compressor 3. The high-pressure nozzle is installed at the stern baseline (before the lifting deck 10). The high-pressure gas generated by the ship-borne air compressor 3 is ejected along the length direction of the moon pool, and a group of fine bubbles with a certain diameter is generated, forming a bubble curtain wall with a certain width in the middle and rear part of the moon pool.

[0034] Reference Figure 4 The air supply valve 5 is installed between the bubble generating device 4 and the shipboard air compressor 3, and is used to control the air supply of the wave-breaking system and prevent seawater from flowing back when the wave-breaking system is not working;

[0035] It also includes a first deck 8, a second deck 9 and a lifting deck 10. The first deck 8 is arranged below the second deck 9. The wave-breaking equipment room 7 is arranged between the first deck 8 and the second deck 9. The retracting and releasing operation command room 6 is arranged above the second deck 9. The lifting deck 10 is located in the moon pool, and the lifting and lowering is monitored by the wave-breaking centralized control facility 2. The moon pool wave-breaking system at the rear of the ship is functionally interlocked with the lifting deck 10, that is, the moon pool wave-breaking system can only be started when the lifting deck 10 is lowered to less than half of the hull depth.

[0036] Example

[0037] In this embodiment, the flow direction and velocity sensor is installed in the middle of the bottom of the ship, and the ship's water velocity Vt and the seawater flow direction are measured by electromagnetic induction or acoustic principle, and the ship's water velocity Vt and the seawater flow direction are returned to the wave-breaking centralized control facility 2 and the cab. The cab controls the generation position of the stern bubble curtain wall by adjusting the speed and heading to achieve a better wave-breaking effect;

[0038] Specifically, the flow velocity sensor meets the requirements of IMO A.694 (17), MSC.96 (72), MSC.334 (90) and MSC.191 (79) (or meets the latest versions of the above-mentioned relevant specifications), the measurement accuracy is not greater than 0.2% of the speed or 0.1 knot, the measurement range is -10.00kn~40.00kn (or sufficient to cover the actual speed of the scientific research vessel), and it can work normally when the ship rolls 15° and pitches 5°. The flow velocity sensor must be installed to ensure watertightness, the electrodes and the planes on which they are located are not allowed to be painted, and the shielding performance is good.

[0039] like Figure 5 As shown, the wave-breaking centralized control facility 2 is arranged in the command room 6 for the retracting and launching operation, and includes a start-stop switch of the wave-breaking system, a start-stop switch of the ship-borne air compressor 3, a lifting deck 10 and a moon pool monitoring unit, an air supply calculation unit, an air supply valve 5 control knob and other devices. The wave-breaking centralized control facility 2 calculates the theoretical wave-breaking air supply according to the ship's water speed Vt (the flow velocity and the ship's speed are considered as the water speed), the wave wavelength λ obtained by monthly statistics of the target sea area and other data;

[0040] The theoretical air supply for wave elimination is Q0 = max{Q cr , Q m}, that is, the theoretical gas supply Q0 is Q cr , Q m The maximum value of the two is taken as the initial value of the air supply of the tail moon pool wave absorption system, where:

[0041]

[0042] g is the acceleration of gravity; P is the local atmospheric pressure; D is the depth of the high-pressure nozzle of the bubble generating device 4; Q cr is the air supply of the shipboard air compressor 3 when offsetting the wave with the incident wavelength statistical value of λ; Q m The velocity of the horizontal flow is V t When , the air supply of the shipboard air compressor 3; K1, K2 are correction coefficients (the default value is 1);

[0043] Specifically, the centralized wave-breaking control facility 2 is integrated on the control console of the rear retracting and launching operation command room 6. There is a control panel on the control console. The control panel displays in Chinese and has a touch screen. The functional units are equipped with corresponding buttons or knobs, and have an emergency stop button and a reset knob. The control panel of the centralized wave-breaking control facility 2 can display the exhaust pressure, temperature, maintenance reminders, high temperature and high pressure records of the operation history (for maintenance reference), and can provide manual and automatic functional modes, seawater flow velocity and direction monitoring, scientific research ship's water speed, shipboard air compressor air supply, etc. At the same time, the centralized wave-breaking control facility 2 can realize multiple joint control or single control of the shipboard air compressor 3, and any one of them can be used as the main engine.

[0044] The shipboard air compressor 3, i.e., the air compression device, is installed in the wave-breaking equipment room 7 near the moon pool at the stern of the hull. It has two control modes: control in the retracting and releasing operation command room 6 and on-site control. It can perform air compression work according to the air supply volume command issued by the wave-breaking centralized control facility 2;

[0045] Specifically, the shipboard air compressor 3 is equipped with a pressure gauge and a safety valve, and is equipped with an adjustable parameter system and a pressure and temperature alarm system, a fault alarm system, a filter blockage alarm system, an overload protection and a remote control system. It has the functions of adjusting parameters, system and pressure alarm, temperature alarm, fault alarm, filter blockage alarm, overload protection and remote control. The water-cooled shipboard air compressor 3 should be equipped with a low water pressure alarm protection device to ensure that the operating pressure of the shipboard air compressor 3 is stable, has good safety and reliability, and is easy to protect and maintain. The shipboard air compressor 3 has a reserved standard RS485 interface, which can realize direct communication connection with the wave-breaking centralized control facility 2. In addition, the oil content of the air after passing through the filter of the shipboard air compressor 3 is ≤0.001PPm and meets the discharge requirements of the latest relevant specifications and standards.

[0046] The gas pipeline of the bubble generating device 4 has good pressure resistance and corrosion resistance, and can ensure the smooth and efficient transmission of high-pressure gas in the pipeline. The high-pressure nozzle of the bubble generating device 4 has good streamlines on the outside of the hull and is evenly arranged in the direction of the ship width, which can meet the needs of generating a stable bubble curtain wall within the width of the rear moon pool.

[0047] The air supply valve 5 is an electrically controlled flow valve, and the flow setting and switch control can be performed remotely in the command room 6 for the retracting and launching operation, so as to realize manual adjustment of the air supply according to the rising height of the upper lifting deck 10 monitored by the centralized wave-breaking control facility 2 and the actual wave-breaking effect in the moon pool observed by the moon pool monitoring unit, so as to achieve the purpose of correcting the theoretical calculated value of the air supply in the centralized wave-breaking control facility 2, that is, the centralized wave-breaking control facility 2 will record the current operating sea conditions and ship speed, and correct and store the two coefficients K1 and K2 in the calculation formula according to the actual air supply, so that the initial value of the air supply calculated by the centralized wave-breaking control facility 2 during the next retracting and launching operation will be more reasonable.

[0048] When the present invention is in use, the components of the whole wave-breaking system have good reliability, high protection level, and certain waterproof and dustproof capabilities. To ensure that the moon pool wave-breaking system can work normally and that the bubble curtain wall is generated in the rear part of the stern moon pool, the research vessel should maintain a certain speed of top current navigation during the recovery of the submersible (or the water speed is positive and the heading and flow direction are kept in line);

[0049] like Figure 1 As shown, when performing the stern retraction and deployment operation, the first step is that the scientific research vessel maintains a certain speed and sails against the current; the second step is that when the stern lifting deck 10 runs to less than half of the hull depth, the moon pool wave-breaking centralized control facility 2 is started; the third step is that the flow direction and velocity sensor feeds back the seawater flow velocity, flow direction and other information to the wave-breaking centralized control facility 2 and the cab; the fourth step is that the wave-breaking centralized control facility 2 calculates the theoretical wave-breaking air supply according to the input data; the fifth step is that the wave-breaking centralized control facility 2 sends a start command to the shipboard air compressor 3, and the shipboard air compressor 3 is started; the sixth step is that the wave-breaking centralized control facility 2 controls the air supply valve 5 to realize the adjustment of the actual air supply volume; the seventh step is that the compressed gas is ejected through the high-pressure nozzle of the bubble generating device 4, and a bubble curtain wall of sufficient width is generated in the middle and rear part of the moon pool, so as to achieve the purpose of moon pool wave breaking, ensure the safety and reliability of the submersible retraction and deployment operation, reduce the difficulty of the operation, avoid the submersible attitude out of control, and ensure the safety of personnel.

[0050] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A ship stern moon pool wave absorption system, characterized in that: The invention comprises a ship, wherein the stern of the ship is provided with a command room for launching and retracting operations (6), a moon pool and a wave-breaking equipment room (7), wherein the wave-breaking equipment room (7) is close to the moon pool and further comprises a flow direction and velocity sensor, a wave-breaking centralized control facility (2), a ship-borne air compressor (3) and a bubble generating device (4), wherein: The flow velocity sensor is located in the middle of the bottom of the ship to measure the ship's velocity V t and the direction of seawater flow, and the ship's water speed V t and the direction of seawater flow back to the centralized wave-breaking control facility (2) and the navigation cabin; The wave-breaking centralized control facility (2) is arranged in the launching and retrieving operation command room (6). The wave-breaking centralized control facility (2) controls the speed of the ship against the water V t 2. Calculate the theoretical wave-breaking air supply based on the wave wavelength λ data of the target sea area collected monthly; The shipboard air compressor (3) is arranged in the wave-breaking equipment room (7) and performs air compression according to the wave-breaking air supply volume instruction issued by the wave-breaking centralized control facility (2); The bubble generating device (4) comprises a gas pipeline and a high-pressure nozzle. The gas pipeline is connected to the ship-borne air compressor (3). The high-pressure nozzle is installed at the stern baseline of the ship to spray the high-pressure gas generated by the ship-borne air compressor (3) along the length direction of the moon pool and generate a group of fine bubbles with a certain diameter, thereby forming a bubble curtain wall with a certain width in the middle and rear part of the moon pool.

2. The ship stern moon pool wave absorption system according to claim 1, characterized in that: It also includes an air supply valve (5), which is installed between the bubble generating device (4) and the shipboard air compressor (3) and is used to control the air supply volume of the wave-breaking system and prevent seawater from flowing back when the wave-breaking system is not working.

3. The ship stern moon pool wave absorption system according to claim 1, characterized in that: The theoretical air supply for wave elimination is Q0 = max{Q cr , Q m }, that is, the theoretical gas supply Q0 is Q cr , Q m The maximum value of the two is taken as the initial value of the air supply of the tail moon pool wave absorption system, where: g is the acceleration due to gravity; P is the local atmospheric pressure; D is the depth of the high-pressure nozzle of the bubble generating device (4); Q cr is the air supply of the shipboard air compressor when offsetting the wave with the incident wavelength statistical value of λ; Q m The velocity of the horizontal flow is V t When , the air supply of the shipboard air compressor 3; K1 and K2 are correction coefficients.

4. The ship stern moon pool wave absorption system according to claim 1, characterized in that: The ship further comprises a first deck (8), a second deck (9) and a lifting deck (10), wherein the first deck (8) is arranged below the second deck (9), the wave-breaking equipment room (7) is arranged between the first deck (8) and the second deck (9), the launching and retracting operation command room (6) is arranged above the second deck (9), and the lifting deck (10) is located in the moon pool, and the lifting and lowering of the lifting deck (10) is monitored by the wave-breaking centralized control facility (2).

5. The ship stern moon pool wave absorption system according to claim 4, characterized in that: The moon pool wave absorbing system at the rear of the ship is functionally interlocked with the lifting deck (10), that is, the moon pool wave absorbing system can only be started when the lifting deck (10) is lowered to less than half of the hull depth.

6. The ship stern moon pool wave absorption system according to claim 1, characterized in that: The flow velocity sensor has a measurement accuracy of no more than 0.2% or 0.1 knot of the ship speed, a measurement range of -10.00 kn to 40.00 kn, and can operate normally when the ship rolls 15° and pitches 5°.

7. The ship stern moon pool wave absorption system according to claim 1, characterized in that: The wave-breaking centralized control facility (2) is integrated on a control console of the tail retracting and releasing operation command room (6), and the control console is provided with a control panel, which is displayed in Chinese and has a touch screen. Each functional unit is provided with a corresponding button or knob, and has an emergency stop button and a reset knob.

8. The ship stern moon pool wave absorption system according to claim 1, characterized in that: The shipborne air compressor (3) is equipped with a pressure gauge and a safety valve, and is provided with an adjustable parameter system, a pressure and temperature alarm system, a fault alarm system, a filter element blockage alarm system, an overload protection system and a remote control system.

9. The ship stern moon pool wave absorption system according to claim 1, characterized in that: The gas supply valve (5) is an electrically controlled flow valve, which can be remotely set for flow and switch control.

Images