Planar receiving transducer array for deep and far sea surveying and mapping and implementation method of planar receiving transducer array

Abstract

The invention provides a planar receiving transducer array for deep and far sea surveying and mapping and an implementation method thereof, and the method comprises the steps: fixing all spherical array elements of a multi-beam transducer array through a positioning mold, and carrying out the first potting through polyurethane; taking down the upper-end spherical positioning tool, cleaning the surface of the spherical element, preheating the spherical element in an oven at 80 DEG C for 1 hour, then coating the surface of the spherical element and the upper end surface of polyurethane with a coupling agent, placing the spherical element and the upper end surface of polyurethane in a constant-temperature oven at 80 DEG C for 1 hour, and pouring secondary polyurethane; the receiving transducer array is turned over, and after array lead welding is completed, third-time potting of the receiving transducer array is completed; preheating the receiving transducer array subjected to three-time potting for 1 hour, coating the surface with a coupling agent, putting the receiving transducer array into a fourth-time potting mold to complete fourth-time potting, putting the receiving transducer array into the 80-DEG C constant-temperature drying oven, curing for 8 hours, naturally cooling to room temperature, and removing the mold; and a fastening hoop is assembled on the embedded fastening stud of the receiving transducer array to obtain the planar receiving transducer array capable of being used for deep and far sea surveying and mapping.

Description

Technical Field

[0001] The present invention relates to the technical field of deep-sea topography detection, and in particular, to a planar receiving transducer array system for deep-sea mapping and an implementation method thereof, and more particularly, to a planar receiving transducer array system for large-angle beam scanning for deep-sea mapping and an implementation method thereof. Background Art

[0002] In ocean exploration and development activities, the first thing to do is to complete a comprehensive mapping of the seabed topography. The full-sea-depth multi-beam bathymetry system is a typical representative of completing the seabed topography and geomorphology mapping task. It can complete full coverage measurement of the survey area, and has the ability to accurately and quickly obtain underwater topography, as well as the ability to detect targets, identify seabed types and image recognition of seabed targets.

[0003] The underwater wet end of the deep-sea multi-beam detection system includes two modules: transmitting and receiving. Compared with the traditional detection system, the multi-beam detection system can simultaneously transmit and receive multiple beams with different pointing angles. Through multi-sector, multi-beam scanning and subsequent superposition processing, the real-time seabed topography image of the detection target sea area is obtained, which greatly improves the seabed mapping efficiency and accuracy. In order to achieve a larger sector multi-beam scanning, the underwater receiving transducer array of the deep-water multi-beam detection system mostly uses spherical elements as the basic array elements, and assists with sound-absorbing wedges or anti-sound baffles to achieve the large-angle receiving capability of the receiving transducer. This results in a complex structure of the receiving transducer array, which is prone to cracking and falling off during the array molding and long-term underwater work, affecting the watertight characteristics of the underwater wet end, thereby causing irreversible damage to the multi-beam test system. In severe cases, it needs to return to the dry end dock for overall replacement. It is very necessary to optimize the design of the receiving transducer array structure and molding process, improve the long-term watertight reliability of the receiving transducer, and extend the actual service life of the multi-beam detection system.

[0004] Patent document CN100339721C (application number: 200410066560.3) discloses a phased transducer array and a phase control method for an acoustic Doppler current profiler. In the phased transducer array, nearly a thousand transducers are evenly arranged in a circular plane at half-wavelength intervals. All transducers are grouped using the condition that the transducer array generates grating lobes. The group at the center of the phased transducer array is used as the reference group. The transducers with the same relative position in each group are connected in parallel with the relative transducers in the reference group to form 16 transducers. By controlling the phase and amplitude of the transmission and reception signals of the 16 transducer groups, four phased transmission beams and receiving beams with an oblique orthogonal structure that form an angle of 30° with the vertical line of the phased transducer array are realized. Summary of the invention

[0005] In view of the defects in the prior art, an object of the present invention is to provide a planar receiving transducer array for deep-sea mapping and an implementation method thereof.

[0006] A method for implementing a planar receiving transducer array for deep-sea mapping provided by the present invention includes:

[0007] Step S1: complete the preliminary assembly and bonding of the receiving transducer array body, the spherical element sits on the support screw, passes through the sound absorbing wedge and the rear support base plate, and leads the spherical element lead to the back of the support base plate;

[0008] Step S2: using a tooling mold to cover the receiving transducer array body, using the upper cover plate of the tooling mold to fix all the spherical elements of the receiving transducer array, using polyurethane for the first potting, and completing the positioning and installation of the spherical elements and the supporting screws;

[0009] Step S3: remove the upper cover plate, clean the surface of the spherical element and place it in an oven that meets the preset requirements for a preset time, then coat the coupling agent on the surface of the spherical element and the upper end surface of the polyurethane, and then place it in an oven that meets the preset requirements for a preset time and then pour polyurethane for the second time;

[0010] Step S4: removing the tooling mold and inverting the current receiving transducer array body, welding the array leads, and completing the third potting of the receiving transducer array after completing the array lead welding;

[0011] Step S5: preheating the receiving transducer array that has completed the third potting for a preset time, coating the surface with a coupling agent and then placing it in a fourth potting mold, installing the fastening studs and completing the fourth potting of the receiving transducer array, placing it in an oven that meets the preset requirements and curing it for a preset time, then naturally cooling it to room temperature before demolding;

[0012] Step S6: Assemble the fastening clamp onto the fastening studs of the potted receiving transducer array to obtain a planar receiving transducer array that can be used for deep-sea mapping.

[0013] Preferably, step S2 includes: using a tooling mold to cover the receiving transducer array body, the upper cover plate has several rows of spherical element positioning grooves to ensure the height of the spherical element and the array position accuracy, and the first room temperature polyurethane potting is completed horizontally, and the first potting surface is positioned to the lower end surface of the spherical element. After the potting is cured, the positioning of the supporting thin rod and the preliminary positioning of the spherical element can be achieved.

[0014] Preferably, the first potting in step S2 uses room temperature curing polyurethane, and the density of the room temperature curing polyurethane is 1.05 g / cm 3 .

[0015] Preferably, step S3 comprises: removing the upper cover plate, cleaning the surface of the spherical element, and preheating it in an 80° constant temperature oven for 1 hour, then coating the surface of the spherical element and the end face of the first potting with a coupling agent, placing it in an 80° constant temperature oven for 1 hour, and then pouring polyurethane for the second time, and after the second polyurethane potting is completed, placing it in an 80° constant temperature oven for curing for 8 hours, and then naturally cooling to room temperature, and the second potting is performed to the surface of the spherical element 1mm above the end face, and the precise positioning and installation of the spherical element is completed;

[0016] Preferably, the second pouring of polyurethane comprises: using watertight packaging polyurethane and using open pouring.

[0017] Preferably, step S4 includes: removing the tooling mold and inverting the current receiving transducer array body, installing a watertight cable, a bracket and four fastening bolts and completing the spherical element lead welding, installing the tooling mold to complete the third potting, the potting surface covers the lead-out wire and reaches 1 / 2 the height of the bracket, ensuring that there is a 5-8mm thickness margin on the back of the fourth potting.

[0018] Preferably, step S5 includes: placing the receiving transducer array body and the positioning studs in an 80° constant temperature oven for preheating for 1 hour, coating the coupling agent and accurately positioning them in the installation mold, completing the fourth potting, and after the fourth potting is completed, placing them in an 80° constant temperature oven for curing for 8 hours, and naturally cooling to room temperature for demolding.

[0019] Preferably, the fourth potting is watertight potting of the entire receiving transducer array, and before potting, the receiving transducer array is in a regular rectangular shape.

[0020] Preferably, after the fourth potting, a convex-shaped base array appearance is formed to ensure that the base array can be installed on the bottom of the ship or on the installation platform to achieve a smooth installation surface without bumps and depressions.

[0021] A planar receiving transducer array for deep-sea surveying and mapping provided by the present invention is obtained by using the above-mentioned method for realizing the planar receiving transducer array for deep-sea surveying and mapping.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The present invention adopts a four-time potting method. The first three pottings respectively complete the high-precision positioning of the receiving transducer array and the back lead packaging. Under the premise of not affecting the acoustic radiation performance of the array, the complex structure of the receiving transducer array is changed into a regular near-rectangular shape, ensuring the consistency of the thickness of each contact surface of the watertight packaging potting, greatly reducing the shrinkage stress in the polyurethane watertight packaging process, and improving the reliability of the transducer array for long-term underwater work;

[0024] 2. The positioning studs for array positioning and installation provided by the present invention have no physical structural contact with the main array surface of the receiving transducer, and the main body of the array is completely covered in watertight polyurethane rubber, which ensures the watertight integrity of the array and improves the reliability of the transducer array working underwater for a long time;

[0025] 3. The fastening clamp provided by the present invention fastens and protects the four fastening studs that are physically connected to the transducer array. The fastening studs have waterproof grooves. After being fastened by the clamp, the watertightness of the fastening studs can be further ensured, thereby improving the watertightness reliability of the transducer receiving array during long-term underwater operation.

[0026] 4. According to the structural characteristics of the receiving transducer of the multi-beam detection system, the different assembly process flows of the receiving transducer array are completed through multiple potting forms, and the high-precision installation positioning and watertight packaging of the receiving transducer array are completed to achieve long-term watertight reliability of the transducer array, thereby extending the actual service life of the transducer, receiving, compression resistance and sound insulation and decoupling capabilities. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0028] Figure 1 A cross-sectional view of the receiving transducer array.

[0029] Figure 2 This is a diagram showing the main body positioning of the receiving transducer array.

[0030] Figure 3 This is a view of the receiving transducer array body after the first potting.

[0031] Figure 4 This is a view of the receiving transducer array body after the second potting.

[0032] Figure 5 This is a main body view of the receiving transducer array after the third potting.

[0033] Figure 6 This is a main body view of the receiving transducer array after the fourth potting.

[0034] Figure 7 This is a main body view of the receiving transducer array after the fourth potting.

[0035] Figure 8 Physical picture of the planar receiving transducer array for deep-sea mapping. DETAILED DESCRIPTION

[0036] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0037] Example 1

[0038] A method for implementing a planar receiving transducer array for deep-sea mapping provided by the present invention includes:

[0039] Step 1: Complete the preliminary assembly and bonding of the receiving transducer array body. The spherical element sits on the support screw and passes through the sound absorbing wedge and the rear support base plate. The spherical element lead is introduced into the back of the support base plate.

[0040] Step 2: Use the tooling mold to cover the multi-beam transducer array body, use the upper cover plate of the tooling mold to fix all the spherical elements, position the spherical elements with high precision, use polyurethane for the first potting, and complete the positioning and installation of the spherical elements and the supporting screws;

[0041] Step 3: Remove the upper cover plate, clean the surface of the spherical element and place it in an 80° oven for preheating for 1 hour, then apply a coupling agent on the surface of the spherical element and the upper end face of the polyurethane, place it in an 80° constant temperature oven for 1 hour, and then pour the polyurethane for the second time;

[0042] Step 4: Remove the tooling mold and invert the current receiving transducer array body, weld the array leads, and complete the third potting of the receiving transducer array after completing the array lead welding;

[0043] Step 5: Preheat the receiving transducer array that has completed three potting for 1 hour, coat the surface with coupling agent and install it into the fourth potting mold, install the fastening studs to complete the fourth watertight packaging and potting of the receiving transducer array, put it in an 80° constant temperature oven for curing for 8 hours, and then remove the mold after it naturally cools to room temperature.

[0044] Step 6: Assemble four fastening clamps on the four fastening studs of the potted receiving transducer array, and finally obtain a planar receiving transducer array that can be used for deep-sea mapping.

[0045] Specifically, the first potting uses room temperature curing polyurethane, which has a density of 1.05g / cm3, small shrinkage and excellent fluidity.

[0046] The first potting is only performed to the connection position between the spherical array element and the screw, mainly to complete the initial precise positioning of the support screw and the spherical array element.

[0047] Specifically, the second potting uses watertight packaging polyurethane and adopts open pouring.

[0048] The second potting is only performed to 1 mm above the upper end surface of the spherical array element, completing the precise positioning and installation of the spherical array element.

[0049] Specifically, the third potting uses room temperature polyurethane potting to complete the coating of the back lead.

[0050] Specifically, the fourth potting is the watertight potting of the receiving transducer array as a whole. Before potting, the receiving transducer array is in a regular rectangular shape.

[0051] Specifically, the positioning stud is positioned with high precision by the positioning pin and the mold, and has no structural contact with the receiving transducer array.

[0052] After the fourth potting, a convex-shaped base array appearance is formed, ensuring that the base array can be installed on the bottom of the ship or on the installation platform with a smooth installation surface without bumps.

[0053] According to the present invention, a planar receiving transducer array that can be used for deep-sea surveying and mapping is obtained by using the above-mentioned method for realizing a planar receiving transducer array for deep-sea surveying and mapping. The planar receiving transducer array that can be used for deep-sea surveying and mapping includes: a transducer array body 1, 8 installation positioning studs 2 and four fastening studs 3.

[0054] Example 2

[0055] Embodiment 2 is a preferred embodiment of Embodiment 1

[0056] The present invention provides a method for realizing a planar receiving transducer array for deep-sea surveying and mapping, such as Figures 1 to 8 As shown, including:

[0057] Step S1: Figure 1 As shown, the receiving transducer array body has completed the preliminary assembly and bonding, the spherical element sits on the supporting thin rod, and the spherical element lead is introduced into the back of the supporting bottom plate through the sound absorbing wedge and the rear supporting bottom plate;

[0058] Step S2: Figure 2 As shown in the figure, the receiving transducer array body is covered with a tooling mold. The upper cover plate has several rows of spherical array element positioning grooves to ensure the height of the spherical array element and the array position accuracy. The first room temperature polyurethane potting is completed horizontally. The first potting cover is to the lower end surface of the spherical array element. After the potting is cured, the positioning of the supporting thin rod and the preliminary positioning of the spherical array element can be achieved. After potting, the attached Figure 3The receiving transducer array body shown in the figure; positioning can prevent the spherical array element from tilting and falling off and the screw from being installed in place, ensuring that the spherical array element has the same height in the horizontal, vertical and horizontal planes. The main purpose of the first potting is to initially fix the screw and spherical array element without affecting the main body sound absorption baffle effect.

[0059] Step S3: Remove the upper end cover plate, clean it, preheat it in a constant temperature oven at 80° for 1 hour, then apply coupling agent on the surface of the spherical array element and the end face of the first potting, and complete the second watertight polyurethane potting. After potting, put it in a constant temperature oven at 80° for curing for 8 hours and naturally cool it to room temperature. The second potting cover is 1mm above the upper end face of the spherical array element. After potting, the surface is obtained as shown in the attached figure. Figure 4 The main purpose of the second potting is to fix the spherical array elements without affecting the acoustic baffle effect of the main body, to prevent the subsequent processes from affecting and damaging the array elements, and to ensure the flatness of the main body surface.

[0060] Step S4: Remove the tooling mold and invert the current receiving transducer array body, install the watertight cable, bracket and four fastening bolts and complete the spherical element lead welding, install the mold to complete the third potting, the potting cover is submerged over the lead wire and reaches 1 / 2 of the bracket height, ensure that there is a 5-8mm thickness margin on the back of the fourth potting, forming the attached Figure 5 The main purpose of the third potting is to cover the rear array lead wires and ensure the flatness of the back of the main body.

[0061] Step S5: Place the receiving transducer array body and eight positioning studs in an 80° constant temperature oven for preheating for 1 hour, then apply the coupling agent and accurately position and install them in the mold, complete the fourth watertight packaging and potting, place them in an 80° constant temperature oven for curing for 8 hours, cool naturally to room temperature, demould, and fasten the four fastening hoops to the fastening studs on the back of the array to obtain the attached Figure 7 The actual planar receiving transducer array for large-angle beam scanning for deep-sea mapping is shown. The two sides of the receiving transducer array are concave, which is conducive to the flatness of the surface of the array installation in the later stage. The main purpose of the fourth potting is to watertightly cover the receiving transducer array to ensure the normal operation of the array underwater.

[0062] Through this example, a planar receiving transducer array for large-angle beam scanning for deep-sea surveying is produced. The planar receiving transducer array can be assembled in multiple pieces to achieve the installation of the planar receiving transducer array. Therefore, the planar receiving transducer array produced according to the method provided by the present invention achieves a good effect.

[0063] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A method for implementing a planar receiving transducer array for deep sea surveying and mapping, characterized in that: include: Step S1: complete the preliminary assembly and bonding of the receiving transducer array body, the spherical element sits on the support screw, passes through the sound absorbing wedge and the rear support base plate, and leads the spherical element lead to the back of the support base plate; Step S2: using a tooling mold to cover the receiving transducer array body, using the upper cover plate of the tooling mold to fix all the spherical elements of the receiving transducer array, using polyurethane for the first potting, and completing the positioning and installation of the spherical elements and the supporting screws; Step S3: remove the upper cover plate, clean the surface of the spherical element and place it in an oven that meets the preset requirements for a preset time, then coat the coupling agent on the surface of the spherical element and the upper end surface of the polyurethane, and then place it in an oven that meets the preset requirements for a preset time and then pour polyurethane for the second time; Step S4: removing the tooling mold and inverting the current receiving transducer array body, welding the array leads, and completing the third potting of the receiving transducer array after completing the array lead welding; Step S5: preheating the receiving transducer array that has completed the third potting for a preset time, coating the surface with a coupling agent and then placing it in a fourth potting mold, installing the fastening studs and completing the fourth potting of the receiving transducer array, placing it in an oven that meets the preset requirements and curing it for a preset time, then naturally cooling it to room temperature before demolding; Step S6: Assemble the fastening clamp onto the fastening studs of the potted receiving transducer array to obtain a planar receiving transducer array that can be used for deep-sea mapping.

2. The method for implementing a planar receiving transducer array for deep-sea mapping according to claim 1, characterized in that: The step S2 includes: using a tooling mold to cover the receiving transducer array body, the upper cover plate has several rows of spherical element positioning grooves to ensure the height of the spherical element and the array position accuracy, and the first room temperature polyurethane potting is completed horizontally. The first potting surface is positioned to the lower end surface of the spherical element. After the potting is cured, the positioning of the supporting thin rod and the preliminary positioning of the spherical element can be achieved.

3. The method for implementing a planar receiving transducer array for deep-sea mapping according to claim 1, characterized in that: The first potting in step S2 uses room temperature curing polyurethane, which has a density of 1.05 g / cm 3 .

4. The method for implementing a planar receiving transducer array for deep-sea mapping according to claim 1, characterized in that: The step S3 comprises: removing the upper cover plate, cleaning the surface of the spherical element, and preheating it in an 80° constant temperature oven for 1 hour, then coating the surface of the spherical element and the end face of the first potting with a coupling agent, placing it in an 80° constant temperature oven for 1 hour, and then pouring polyurethane for the second time. After the second polyurethane potting is completed, placing it in an 80° constant temperature oven for curing for 8 hours and then naturally cooling it to room temperature. The second potting is performed to 1 mm above the upper end face of the spherical element, and the precise positioning and installation of the spherical element is completed.

5. The method for implementing a planar receiving transducer array for deep-sea mapping according to claim 4, characterized in that: The second pouring of polyurethane comprises: using watertight packaging polyurethane and using open pouring.

6. The method for implementing a planar receiving transducer array for deep-sea mapping according to claim 1, characterized in that: The step S4 includes: removing the tooling mold and inverting the current receiving transducer array body, installing the watertight cable, bracket and four fastening bolts and completing the spherical element lead welding, installing the tooling mold to complete the third potting, the potting surface covers the lead-out wire and reaches 1 / 2 of the height of the bracket, ensuring that there is a 5-8mm thickness margin on the back of the fourth potting.

7. The method for implementing a planar receiving transducer array for deep-sea mapping according to claim 1, characterized in that: The step S5 includes: placing the receiving transducer array body and the positioning studs in an 80° constant temperature oven for preheating for 1 hour, coating the coupling agent and accurately positioning and installing them in the mold, completing the fourth potting, and after the fourth potting is completed, placing them in an 80° constant temperature oven for curing for 8 hours, and naturally cooling to room temperature for demolding.

8. The method for implementing a planar receiving transducer array for deep-sea mapping according to claim 7, characterized in that: The fourth potting is the overall watertight potting of the receiving transducer array. Before potting, the receiving transducer array is a regular rectangular parallelepiped.

9. The method for implementing a planar receiving transducer array for deep-sea mapping according to claim 1, characterized in that: After the fourth potting, a convex-shaped base array appearance is formed, ensuring that the base array can be installed on the bottom of the ship or on the installation platform to achieve a smooth installation surface without bumps.

10. A planar receiving transducer array that can be used for deep sea surveying and mapping, characterized in that: The method for implementing the planar receiving transducer array for deep-sea mapping as described in any one of claims 1 to 9 is obtained.

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