A large depth touch bottom towed body for deploying L-shaped linear array

Abstract

This invention relates to a deep-sea towed body for deploying an L-shaped linear array, comprising a towed body shell, a slanted tail fin, a horizontal tail fin, a support frame, a horizontal linear array, a vertical linear array, a tow cable, a counterweight, an electronics compartment, a battery compartment, and heading and depth sensor compartments. The towed body shell is flat and teardrop-shaped, formed by horizontally laying out two standard airfoils of different lengths staggered forward and backward in the longitudinal and port / starboard sections of the towed body. The slanted tail fin is laid out at an angle based on the standard airfoils, and its interior is filled with pressure-resistant buoyancy material. This invention, using a tow cable, can be used to deploy an L-shaped linear array at depths up to 7000m, and to power the sensors within the array and facilitate signal acquisition and transmission.

Description

Technical fields:

[0001] This invention belongs to the field of underwater acoustic detection technology, specifically relating to a deep-sea towed body for deploying an L-shaped linear array. Background technology:

[0002] With the research and testing of reliable acoustic path detection technology in the underwater acoustics industry, the feasibility of placing deep-sea sonar nodes at extremely deep depths in international waters to achieve submarine detection over a wide area has been verified. Submarine detection technology has initially entered the stage of three-dimensional observation. However, to date, no equipment capability has been formed. One limiting factor is the insufficient equipment capability to deploy deep-sea, large-depth three-dimensional observation arrays.

[0003] Vertical linear arrays are deployed in a predetermined sea area using vertical array submersibles / buoys. The hydrophone arrays are vertically connected in series at a predetermined depth using submersible / buoy anchor blocks, cables, and floats. The vertical linear arrays themselves have zero buoyancy. During retrieval, the release device discards the anchor blocks, and the array rises to the surface with the floats for recovery. Horizontal linear arrays can be towed directly by the winch towing system on the experimental vessel, or connected to a dedicated towing body for depth-controlled towing; they can also be towed from submarines / unmanned underwater vehicles. These towing methods allow the linear arrays to be arranged in a horizontal formation in the water.

[0004] Combining horizontal and vertical linear arrays to form an L-shaped linear array allows multiple spatial nodes to work together, enabling submarine detection and tracking over a wider range. This is a pressing technical problem that needs to be solved. In particular, the towing system equipment used to support the deep-sea deployment of the L-shaped linear array urgently needs to be developed. The prerequisite for achieving this goal is that the towed body can deploy the L-shaped linear array at a depth of no less than 7,000 meters on the seabed to construct a deep-sea near-bottom bottom passive detection system. Summary of the Invention:

[0005] The technical problem to be solved by the present invention is to provide a deep-sea towed body for deploying L-shaped linear arrays. This deep-sea towed body, under the traction of a tow cable, can be used to deploy L-shaped linear arrays at depths of up to 7000m on the seabed, and realize the power supply of sensors within the linear array as well as the acquisition and transmission of signals.

[0006] The technical solution of this invention is to provide a deep-sea towed body for deploying an L-shaped linear array, comprising a towed body shell, a slanted tail fin, a horizontal tail fin, a support frame, a horizontal linear array, a vertical linear array, tow cables, a counterweight, an electronics compartment, a battery compartment, and heading and depth sensor compartments; wherein,

[0007] The tow body has a flat teardrop shape. It is formed by horizontally laying out two standard airfoils of different lengths with staggered front and rear sections on the longitudinal section and port and starboard sections of the tow body. The overall shape is smooth and continuous, with low drag and small hydrodynamic drift angle stability.

[0008] The oblique tail fin is based on the standard airfoil but is laid out at an angle, and the interior of the oblique tail fin is filled with pressure-resistant buoyancy material.

[0009] The horizontal stabilizer uses a combination of a fixed horizontal stabilizer and a trim wing. Both the fixed horizontal stabilizer and the trim wing are variable-thickness flat plate structures filled with pressure-resistant buoyancy material. The angle of attack of the trim wing can be changed by rotating the solenoid tube above the wing. One part is used to adjust the pitch and roll of the towed body due to machining imbalances, and the second part is an adjustable angle of attack to change the overall roll angle when the towed body is towed.

[0010] The supporting frame is a frame structure. The outer perimeter of the supporting frame and the inner side of the towing body shell are linearly aligned. The bottom truss of the supporting frame is equipped with a base for installing the electronic compartment and battery compartment.

[0011] The counterweights include bow counterweights and midship counterweights. The midship counterweights are located directly below the towing point at the bottom of the towing body, while the bow counterweights are located at the foremost point of the bow of the towing body. Both counterweights are fixed to the towing body support frame. Through the reasonable arrangement of the counterweights, the bow position is always maintained.

[0012] The horizontal linear array has microgravity as a whole, with a load-bearing watertight connector at the front end and a weight module at the rear end; the vertical linear array has microbuoyancy as a whole, with a watertight load-bearing connector at the lower end and a buoyancy module installed at the upper end; the horizontal linear array is located at the tail of the towed body shell, and the vertical linear array is located at the upper part of the towed body shell; in addition to hydrophones, several attitude and pressure sensors are also distributed in the two linear arrays; the electrical signals from the sensors in the horizontal and vertical linear arrays are transmitted to the electronics compartment and converted into optical signals, which are then transmitted to the water surface through optical fibers in the tow cable, and finally converted into readable electrical signals by the photoelectric conversion module;

[0013] The electronics compartment, battery compartment, heading and depth sensor compartment are connected by interconnecting cables. The electronics compartment is connected to the horizontal linear array and vertical linear array via watertight connectors, and the electronics compartment is connected to the optical tow cable at the bottom of the tow head via optical connectors. The electronics compartment is also connected to the battery compartment and the heading and depth sensor compartment via watertight connectors.

[0014] In use, the towed body is first dragged at low speed in the seawater under the traction of the tow cable. The tow cable is then released, and according to the transmitted attitude and depth data, after the horizontal array and the towed body come into contact with the seabed, the towing continues until the horizontal array is straightened horizontally and then stops. The vertical array returns to a vertical state under its own buoyancy, thus realizing the deployment of an L-shaped array on the seabed.

[0015] The towed body can tow two linear arrays by a single tow cable, and features two towing modes: the first is towing in seawater at different depths, and the second is bottom-touching towing at great depths; it can deploy L-shaped linear arrays at depths up to 7000 meters. In the first towing mode, the tow cable pulls the towed body at a low speed in the seawater. The horizontal linear array tilts downwards and backwards under its own weight and hydrodynamic forces, while the vertical linear array tilts upwards and backwards under its own buoyancy and hydrodynamic forces. The two linear arrays do not interfere with each other. In the second towing mode, as the tow cable is gradually released, the tail of the horizontal linear array contacts the seabed first. When the pressure and attitude data transmitted from the depth and attitude sensors within the towed body gradually remain constant, it indicates that the towed body and the horizontal linear array are fully in contact with the seabed. After towing for a further distance, the heading data transmitted from several attitude sensors distributed within the horizontal linear array remain consistent, indicating that the horizontal linear array has been straightened on the seabed, and towing stops; the vertical linear array returns to a vertical position under the influence of buoyancy. Two line arrays form an L-shaped array on the seabed.

[0016] As a preferred option, the outer shell of the towing body adopts a variable thickness design, with a thickness of 6mm on the front, top and sides, and a thickness of 10mm on the bottom, and is made of high-strength glass fiber reinforced plastic vacuum forming.

[0017] Preferably, the towing body shell includes a left front shell, a right front shell, a middle front shell, a middle rear shell, and a lower shell. The left front shell, right front shell, middle front shell, and middle rear shell can be disassembled independently to facilitate the installation of internal equipment.

[0018] Preferably, the tow body shell has several circular through holes on the top and bottom for water inlet and drainage inside the tow body during deployment and recovery, so as to maintain the pressure balance inside and outside the tow body cavity.

[0019] As a preferred option, the tow body shell is formed by simultaneously laying out two different lengths of the NACA0030 standard airfoil with staggered front and rear sections in the longitudinal section and port and starboard sections of the tow body to form an integral line shape; the oblique tail is based on the NACA00012 standard airfoil and is laid out at an angle of less than 45 degrees with the horizontal plane. The oblique tail is filled with pressure-resistant buoyancy material. This can not only avoid the collision between the vertical tail wing and the tail wing during towing, but also provide restoring moment for both the roll and pitch of the tow body.

[0020] As a preferred option, the supporting frame is a frame structure composed of welded and bolted titanium alloy plate beams, and several conformal reinforcing ribs are set at different positions on the cross section, longitudinal section and horizontal section of the tow body to ensure the overall structural strength in all directions.

[0021] Preferably, the base includes a battery compartment base and an electronics compartment base, with the battery compartment base arranged symmetrically from left to right. The electronics compartment base is located at the rear of the bottom of the support frame, and the heading and depth sensor compartment is located on the mid-longitudinal section of the front of the towed body. Midway counterweights and bow counterweights are located directly below the towing point at the bottom of the towed body and at the very front of the towed body, respectively, to lower the center of gravity and ensure that the towed body does not capsize during bottom towing. A towing frame is installed in the middle of the support frame, and the towing frame is bolted to the top of the towed body shell. The towing head interface is higher than the towed body shell, located at one-third of the towed body length. A vertical linear array interface is located directly behind the towing point at the rear of the towing frame. The base is bolted to the support frame and can be flexibly disassembled and replaced to accommodate other equipment. A horizontal linear array interface is also provided at the rear of the support frame, located at the intersection of the mid-longitudinal section and the horizontal symmetry plane of the towed body shell. Preferably, pins and baffles are used to install the vertical and horizontal array load-bearing connectors onto the towed body.

[0022] As a preferred embodiment, the electronics compartment, battery compartment, heading and depth sensor compartment are all watertight pressure-resistant compartments made of titanium alloy cylindrical bodies combined with two hemispherical covers. An outer ring rib is set in the middle of the cylindrical body, and a watertight connector is installed at the end of the hemispherical cover.

[0023] Furthermore, the two watertight connectors on the stern cover of the electronics compartment are connected to the horizontal and vertical arrays, respectively; the optical connector in the middle of the bow cover of the electronics compartment is connected to the optical tow cable at the lower end of the tow head; and the three watertight connectors around the circumference of the electronics compartment are connected to the two battery compartments and the heading and depth sensor compartments, respectively.

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] The towed body of this invention has a smooth and continuous overall shape, low resistance, and hydrodynamic stability with a small drift angle, maintaining a raised bow position during seawater and bottom towing. When pulled by a tow cable, the towed body can be deployed in an L-shaped linear array at depths up to 7000m, providing power to the sensors within the array and facilitating signal acquisition and transmission. Attached image description:

[0026] Figure 1 This is a schematic diagram of a deep-bottom-reaching tow body for deploying an L-shaped linear array according to the present invention;

[0027] Figure 2 This is a schematic diagram of the internal structure of a deep bottom-reaching tow body for deploying an L-shaped linear array, according to the present invention.

[0028] Figure 3 This is a schematic diagram of a deep bottom-reaching towing support frame for deploying an L-shaped linear array according to the present invention.

[0029] Figure 4 This is a schematic diagram of a deep-bottoming towed horizontal tail fin for deploying an L-shaped linear array, according to the present invention.

[0030] In the picture:

[0031] Right front shell of towed body 1-1; Left front shell of towed body 1-2; Middle front shell of towed body 1-3; Middle rear shell of towed body 1-4; Lower shell of towed body 1-5; Slanted tail fin 1-6; Horizontal tail fin 1-7; Adjustable fin 1-8; Tow head 1-9; Tow cable 1-10; Vertical line array 1-11; Horizontal line array 1-12.

[0032] Support frame 2-1; High-voltage battery compartment 2-2; Low-voltage battery compartment 2-3; Electronics compartment 2-4; Heading and depth sensor compartment 2-5; Bow ballast 2-6; Midships ballast 2-7.

[0033] Forward lower rib 3-1; Forward upper rib 3-2; Forward vertical bar 3-3; Forward transverse bottom rib 3-4; Center transverse bottom rib 3-5; Aft transverse bottom rib 3-6; Aft vertical bar 3-7; Aft upper rib 3-8; Aft deck longitudinal rib 3-9; Deck longitudinal rib 3-10; Bottom plate longitudinal rib 3-11; Forward support frame 3-12; Port side longitudinal rib 3-13; Starboard side longitudinal rib 3-14; Stern transverse rib 3-15; Forward drag plate 3-16; Port drag plate 3-17 Right trailer plate 3-18; Rear trailer plate 3-19; Front frame support 3-20; Rear frame support 3-21; Front support elbow plate 3-22; Rear support elbow plate 3-2; Right mid-longitudinal bone 3-24; Left mid-longitudinal bone 3-25; Attitude and depth sensor compartment base 3-26; Battery compartment front seat 3-27; Battery compartment rear seat 3-28; Electronics compartment front seat 3-29; Electronics compartment rear seat 3-30; Pin 3-31; Pin cover plate 3-32.

[0034] Adjusting seat 4-1; clockwise adjusting rod 4-2; counterclockwise adjusting rod 4-3; rotating screw sleeve 4-4. Detailed implementation method:

[0035] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0036] refer to Figures 1-4 This invention illustrates a deep-sea towed body for deploying an L-shaped linear array, comprising a towed body shell, oblique tail fins 1-6, horizontal tail fins 1-7, a support frame 2-1, an electronics compartment 2-4, a battery compartment, a heading and depth sensor compartment 2-5, a horizontal linear array 1-12, a vertical linear array 1-11, and tow cables 1-10, etc.

[0037] The tow body's outer shell shape is based on the NACA0030 standard airfoil. It is formed by horizontally laying out the mid-longitudinal section and the port and starboard longitudinal sections to create a flat, streamlined body. The upper part has a trapezoidal cross-section that runs through the bow and stern. The bulge is longitudinally obliquely cut at the stern, and the entire tow body body is transversely cut at the stern.

[0038] In this embodiment, the tow body outer shell consists of a right front shell 1-1, a right front shell 1-2, a middle front shell 1-3, a middle rear shell 1-4, and a lower shell 1-5. The right front shell 1-1, right front shell 1-2, middle front shell 1-3, and middle rear shell 1-4 are fixed to the support frame with countersunk screws for easy assembly and disassembly. The lower shell 1-5, the oblique tail fin 1-6, and the horizontal tail fin 1-7 are integrated. It is made of high-strength glass fiber reinforced plastic using vacuum molding, with a bottom thickness of 10mm and the remaining parts having a thickness of 6mm.

[0039] Several circular through holes are made in the right front shell 1-1, the left front shell 1-2, and the lower shell 1-5 of the towing body for water inlet and outlet of the internal cavity of the towing body. Rectangular holes are made on the upper part of the middle front shell 1-3 and the middle rear shell 1-4 of the towing body, and a rectangular hole is made in the middle rear. The edges of the holes are chamfered.

[0040] The oblique tail fins 1-6 at the tail of the tow body are laid out based on the standard airfoil of NACA00012, with an angle of about 55 degrees to the horizontal plane. The interior of the oblique tail fins is filled with pressure-resistant buoyancy material of glass microspheres.

[0041] The horizontal stabilizer is a fixed horizontal stabilizer 1-7 combined with an adjustable fin 1-8, both of which are variable-thickness flat plates filled with pressure-resistant buoyancy material. Two adjusting seats 4-1 are respectively embedded in the horizontal stabilizer 1-7 and the adjustable fin 1-8. A clockwise adjusting rod 4-2 and a counter-clockwise adjusting rod 4-3 are bolted to the top of each seat. The adjusting rods have clockwise and counter-clockwise threads at their ends, which are installed into rotating sleeves 4-4 with corresponding internal threads. By rotating the sleeves 4-4, the distance between the two adjusting seats is changed, thereby altering the angle of attack of the adjustable fin 1-8.

[0042] The support frame 2-1 is a frame structure composed of titanium alloy plate beams welded and bolted together. The outer perimeter of the support frame 2-1 and the inner side of the towing body shell are linearly conformal. Several conformal frame structures are set on several cross sections, longitudinal sections and horizontal sections of the towing body. The support frame 2-1 is symmetrical about the left and right along the middle longitudinal section.

[0043] The towing body has four sets of transverse frames on its cross section, consisting of the front lower rib plate 3-1, the front upper rib plate 3-2, the front vertical rod 3-3, the front transverse bottom rib plate 3-4, the middle transverse bottom rib plate 3-5, the rear transverse bottom rib plate 3-6, the rear vertical rod 3-7, the rear upper rib plate 3-8, and the base of the battery compartment and the electronics compartment.

[0044] The battery compartment and electronics compartment base consists of the front battery compartment seat 3-27, the rear battery compartment seat 3-28, the front electronics compartment seat 3-29, and the rear electronics compartment seat 3-30. The base is fixed to the support frame 2-1 by bolts and is detachable.

[0045] Furthermore, the horizontal bottom ribs 3-4 are machined from a single piece of sheet metal, with a flat upper surface and threaded holes for docking with the base; the lower surface is conformal to the bottom of the drag body and has through holes for the bottom longitudinal ribs.

[0046] The longitudinal section has two sets of longitudinal frames that are symmetrical from left to right, consisting of deck longitudinals 3-10, bottom plate longitudinals 3-11, front verticals 3-3, and rear verticals 3-7.

[0047] Among them, there is a horizontal frame in the horizontal section, which is welded together by the forward support frame 3-12, the port side longitudinal bone 3-13, the starboard side longitudinal bone 3-14, and the stern transverse rib 3-15.

[0048] Furthermore, the tail transverse rib plate 3-15 is a frame structure formed by machining a single piece of sheet metal, with its outer surface conforming to the shell and a horizontal line array tow head interface reserved in the middle.

[0049] A towing frame is set in the middle of the support frame. The towing frame consists of a front towing plate 3-16, a left towing plate 3-17, a right towing plate 3-18, and a rear towing plate 3-19. It is supported on the top of the towing body by a front frame bracket 3-20 and a rear frame bracket 3-21, and is connected to the deck longitudinal rib 3-10 by a front support elbow plate 3-22 and a rear support elbow plate 3-23.

[0050] Among them, the left drag plate 3-17 and the right drag plate 3-18 are provided with tractor head pin openings above them, and vertical line array tractor head pin openings are provided behind them.

[0051] Furthermore, the left middle longitudinal bone 3-24 and the right middle longitudinal bone 3-25 are arranged on the horizontal center plane of the tow body shell and are respectively bolted to the front frame support 3-20 and the rear frame support 3-21.

[0052] Furthermore, the left center longitudinal beam 3-24 and the right center longitudinal beam 3-25 are equipped with the heading and depth sensor cabin base 3-26, and multiple counterweight mounting points are set at the front and rear to mount and move the midship counterweight 2-7 and the bow counterweight 2-6 respectively. The counterweights are made of lead.

[0053] The battery compartment is divided into high-voltage battery compartment 2-2 and low-voltage battery compartment 2-3. High-voltage battery compartment 2-2, low-voltage battery compartment 2-3, electronics compartment 2-4, and heading and depth sensor compartment 2-5 are watertight pressure-resistant compartments made of titanium alloy cylindrical compartments combined with two hemispherical covers. Some compartments have reinforcing ring ribs in the middle. The cover and the compartment are sealed by a combination of one end face seal and two radial seals.

[0054] The battery compartment houses lithium batteries. The top of the first compartment cover is cut flat and fitted with two watertight connectors. One connector serves as a switch, and the other serves as a charging / discharging interface.

[0055] The electronics compartment 2-4 houses the power module and photoelectric conversion module. The tops of both the bow and stern covers of the electronics compartment are cut flat. Two watertight connectors on the stern cover connect to the horizontal linear array 1-11 and vertical linear array 1-12 adapter cables, respectively. The optical connector in the middle of the bow cover connects to the optical tow cable connector at the lower end of the tow head. Three circumferential watertight connections connect to the two battery compartments and the heading and depth sensor compartments 2-5, respectively.

[0056] The battery compartment, electronics compartment 2-4, and heading and depth sensor compartment 2-5 are all fixed to their respective bases by clamps and bolts.

[0057] The horizontal linear array 1-11 has microgravity as a whole, with a load-bearing watertight connector at the front end and weights installed at intervals; the vertical linear array 1-12 has positive buoyancy as a whole, with a load-bearing connector at the lower end and a float or float block installed at the upper end via a shackle.

[0058] Furthermore, both the horizontal and vertical linear array connectors have pin holes on both sides. First, using pins 3-31, the connectors for the vertical linear array 1-12 and horizontal linear array 1-11 can be assembled onto the trailing frame and tail cross rib 3-15, respectively. Then, the pin cover plate 3-32 is installed. The horizontal linear array 1-11 can swing up and down at a certain angle with the connector, and the vertical linear array 1-12 can swing back and forth at a certain angle with the connector.

[0059] The lower end of the towing cable 1-10 is vulcanized and assembled to the load-bearing tractor head 1-9. The load-bearing tractor head is assembled to the top of the towing frame through a pin and a pin cover plate 3-32. The towing cable can swing back and forth at a certain angle with the tractor head.

[0060] The electronic compartment 2-4 contains an electro-optical conversion module and an electronic element module. The electronic compartment is powered by a lithium battery. The tow cable consists of an optical fiber transmission line, an optical fiber protection tube, a Kevlar load-bearing rope, and a polyurethane watertight layer. Both ends are watertight load-bearing tow heads.

[0061] In use, the towed body is first dragged at low speed in the seawater under the traction of the tow cable. The tow cable is then released, and according to the transmitted attitude and depth data, after the horizontal linear array and the towed body make contact with the seabed, the towing continues until the horizontal linear array is straightened horizontally and then stops. The vertical linear array returns to a vertical state under its own buoyancy, thus realizing the deployment of an L-shaped linear array on the seabed.

[0062] The towed body can tow two linear arrays by a single tow cable, and features two towing modes: the first is towing in seawater at different depths, and the second is bottom-touching towing at great depths; it can deploy L-shaped linear arrays at depths up to 7000 meters. In the first towing mode, the tow cable pulls the towed body at a low speed in the seawater. The horizontal linear array tilts downwards and backwards under its own weight and hydrodynamic forces, while the vertical linear array tilts upwards and backwards under its own buoyancy and hydrodynamic forces. The two linear arrays do not interfere with each other. In the second towing mode, as the tow cable is gradually released, the tail of the horizontal linear array contacts the seabed first. When the pressure and attitude data transmitted from the depth and attitude sensors within the towed body gradually remain constant, it indicates that the towed body and the horizontal linear array are fully in contact with the seabed. After towing for a further distance, the heading data transmitted from several attitude sensors distributed within the horizontal linear array remain consistent, indicating that the horizontal linear array has been straightened on the seabed, and towing stops; the vertical linear array returns to a vertical position under the influence of buoyancy.

Claims

1. A large depth touch-down towed body for deploying an L-shaped line array, characterized in that: This includes the tow body shell, oblique tail fin, horizontal tail fin, support frame, horizontal linear array, vertical linear array, tow cable, counterweight, electronics compartment, battery compartment, and heading and depth sensor compartment; among which, The tow body shell is flat and teardrop-shaped, and the overall shape is formed by simultaneously laying out two standard airfoils of different lengths in the longitudinal section and the port and starboard sections of the tow body. The oblique tail fin is based on the standard airfoil but is laid out at an angle, and the interior of the oblique tail fin is filled with pressure-resistant buoyancy material. The horizontal tail fin adopts a layout combining a fixed horizontal tail fin and an adjustable fin. Both the fixed horizontal tail fin and the adjustable fin are variable thickness flat plate structures filled with pressure-resistant buoyancy material. The supporting frame is a frame structure. The outer perimeter of the supporting frame and the inner side of the towing body shell are linearly aligned. The bottom truss of the supporting frame is equipped with a base for installing the electronic compartment and battery compartment. The counterweights include bow counterweights and midship counterweights. The midship counterweights are located directly below the towing point at the bottom of the towing body, while the bow counterweights are located at the foremost point of the bow of the towing body. Both counterweights are fixed to the towing body support frame. The horizontal linear array has microgravity, with a load-bearing watertight connector at the front end and a weight module at the rear end; the vertical linear array has microbuoyancy, with a watertight load-bearing connector at the lower end and a buoyancy module installed at the upper end; the horizontal linear array is located at the rear of the tow body shell, and the vertical linear array is located at the upper part of the tow body shell. The electronics compartment, battery compartment, heading and depth sensor compartment are connected by interconnecting cables. The electronics compartment is connected to the horizontal and vertical linear arrays via watertight connectors, and to the tow cable via optical connectors. The electronics compartment is also connected to the battery compartment and the heading and depth sensor compartment via watertight connectors. In use, the towed body is first dragged in the seawater under the traction of the tow cable. After the tow cable is released, the horizontal array and the towed body continue to be dragged after they come into contact with the seabed until the horizontal array is straightened and then stops. The vertical array returns to a vertical state under its own buoyancy, thus realizing the deployment of an L-shaped array on the seabed.

2. The deep-penetrating tow body for deploying an L-shaped linear array according to claim 1, characterized in that: The outer shell of the towing body adopts a variable thickness design, with a thickness of 6mm on the front, top and sides, and 10mm on the bottom, and is made of high-strength glass fiber reinforced plastic vacuum forming.

3. The large depth touch-down towed body for deploying L-shaped line array of claim 2, wherein: The towing body shell includes the left front shell, the right front shell, the middle front shell, the middle rear shell, and the lower shell. The left front shell, the right front shell, the middle front shell, and the middle rear shell can be disassembled independently.

4. The large-depth touch-down towed body for deploying L-shaped line arrays of claim 3, wherein: Several circular through holes are provided on the top and bottom of the tow body shell for water inlet and drainage during deployment and recovery, so as to maintain the pressure balance inside and outside the tow body cavity.

5. The large depth touch-down towed body for deploying L-shaped line array of claim 1, wherein: The tow body shell consists of two different lengths of the NACA0030 standard airfoil with staggered front and rear ends. After being horizontally laid out simultaneously on the longitudinal section and port and starboard sections of the tow body, it forms an overall shape. The oblique tail fin is based on the NACA00012 standard airfoil and is laid out at an angle of less than 45 degrees with the horizontal plane. The oblique tail fin is filled with pressure-resistant buoyancy material.

6. The large-depth touch-down towed body for deploying L-shaped line arrays of claim 1, wherein: The supporting frame is a frame structure composed of welded and bolted titanium alloy plate beams, and several conformal reinforcing ribs are set at different positions on the cross section, longitudinal section and horizontal section of the tow body.

7. The large-depth touch-down towed body for deploying L-shaped line arrays of claim 6, wherein: The base includes a battery compartment base and an electronics compartment base. The battery compartment base is arranged symmetrically on the left and right, and the electronics compartment base is located at the bottom rear of the support frame. A towing frame is set in the middle of the support frame. The towing frame is fixed directly above the outer shell of the towing body. The towing head interface is higher than the outer shell of the towing body and is located one-third of the length of the towing body. A vertical line array interface is set directly behind the towing point at the tail of the towing frame.

8. The deep-penetrating tow body for deploying an L-shaped linear array according to claim 7, characterized in that: The rear of the support frame is also equipped with a horizontal linear array interface, which is located at the intersection of the longitudinal section and the horizontal symmetry plane in the outer shell of the tow body.

9. The large-depth touch-down towed body for deploying L-shaped line arrays of claim 1, wherein: The electronics compartment, battery compartment, heading and depth sensor compartment are all watertight pressure-resistant compartments made of titanium alloy cylindrical bodies combined with two hemispherical covers. The cylindrical body is provided with an outer ring rib in the middle, and the hemispherical covers are equipped with watertight connectors.

10. The large-depth touch-down towed body for deploying L-shaped line arrays of claim 1, wherein: The two watertight connectors on the stern cover of the electronics compartment are connected to the horizontal and vertical arrays, respectively; the optical connector in the middle of the bow cover of the electronics compartment is connected to the optical tow cable at the lower end of the tow head; the three watertight connectors around the electronics compartment are connected to the two battery compartments and the heading and depth sensor compartments, respectively.

Images