A detachable pressure through-transmission device for longitudinal transducer measurement

Abstract

The utility model relates to a detachable pressure sound transmission device for longitudinal transducer measurement, which comprises a sealed cylinder, an openable sound transmission front cover and an openable bottom plate, which enclose a sealed measurement cavity and are filled with an acoustic impedance matching liquid. The bottom plate is provided with an engineering plastic positioning ring for fixing the transducer, and the transducer back cover plate is fixed by screwing the bolts around the positioning ring, thus achieving non-destructive clamping. The sound transmission front cover is provided with a pressure interface for pressurizing the cavity to simulate deep water static pressure and suppress cavitation. The device is also provided with a lifting structure connected with the hoist of the anechoic pool for facilitating directional measurement. The utility model realizes quick assembly and disassembly of the transducer and repeated testing, and can complete full parameter measurement of the sound source level, directivity and emission voltage response of high-power transducers in a shallow anechoic pool, thus significantly improving the testing efficiency and the excellent rate of prototype debugging.

Description

Technical Field

[0001] This utility model relates to the technical field of transducer structural components, and in particular to a detachable pressure-transmitting acoustic device for longitudinal transducer measurement. Background Technology

[0002] Longitudinal transducers (such as piston transducers) are commonly used acoustic devices in underwater acoustic systems. During their research and testing, accurate measurement of key electroacoustic performance parameters such as transmit voltage response, source level, and directivity is crucial. Currently, measurement methods for this type of transducer mainly face the following two problems:

[0003] Inconvenient clamping and difficult disassembly: In traditional testing, to ensure insulation and fixation, transducers are usually encapsulated with materials such as polyurethane. While this method achieves stable installation, once encapsulation is complete, the transducer is fixed to the test fixture as a single unit. If the test results are abnormal or the transducer malfunctions, disassembly is extremely difficult, easily causing damage to the transducer and seriously affecting R&D debugging efficiency and prototype yield.

[0004] Limited measurement environments and interference from cavitation: Sound source-level measurements are generally conducted in anechoic tanks. However, for high-power, low-frequency transducers, the radiated sound pressure is high, while the depth of the anechoic tank is limited, resulting in insufficient static pressure. When the negative pressure peak of the sound wave exceeds the ambient static pressure, cavitation is easily triggered, generating bubble clusters, leading to sound wave propagation distortion and energy loss, causing the measurement data to deviate significantly from the true value. To avoid the effects of cavitation, field tests are often conducted in open, deep water areas such as lakes and oceans, which is not only costly and time-consuming but also significantly constrained by environmental conditions such as weather and hydrology.

[0005] To address the aforementioned issues, there is currently no integrated measurement device that can achieve both rapid and non-destructive clamping of transducers and effectively suppress cavitation by simulating deep-water hydrostatic pressure environments under laboratory conditions.

[0006] Therefore, there is an urgent need for a new type of measuring device that can perform comprehensive performance testing of longitudinal transducers in a standard anechoic water tank, while also being easy to install and disassemble, with adjustable pressure and excellent acoustic transmission, in order to improve testing efficiency, reduce R&D costs and ensure measurement accuracy. Utility Model Content

[0007] To solve the above-mentioned technical problems, this utility model provides a detachable pressure-transmitting acoustic device for longitudinal transducer measurement, comprising:

[0008] A sealed cylinder with openings at both ends;

[0009] An openable acoustically transparent front cover, comprising an acrylic acoustically transparent window and an aluminum alloy plate, which are connected by fastening bolts and a pressing sealing ring;

[0010] An openable chassis is connected to the lower end of the sealing cylinder by a sealing ring and fastening bolts, and together with an openable sound-permeable front cover, forms a sealed measuring cavity.

[0011] The positioning ring, made of engineering plastic, is fixed to the chassis. Its inner shape is adapted to the outer contour of the rear cover plate of the longitudinal transducer to be tested. The side of the positioning ring is provided with through holes and threaded openings. It is fixed to the chassis by bolts passing through the through holes and by bolts being screwed into the threaded openings to tighten the rear cover plate of the transducer.

[0012] Both the pressurization port and the pressure relief port are located on the aluminum alloy plate, used to connect external pressurization equipment and adjust the pressure inside the cavity;

[0013] A pressure gauge, mounted on the aluminum alloy plate, is used to display the pressure inside the cavity;

[0014] The hoisting structure is fixed to the chassis and is used for connection with the anechoic water tank by a vehicle.

[0015] A watertight connector is provided on the sound-permeable front cover and is used to lead out the transducer cable.

[0016] In one embodiment of this invention, the measuring cavity is filled with a matching liquid whose acoustic impedance is close to that of water.

[0017] In one embodiment of this invention, the matching liquid is castor oil.

[0018] In one embodiment of this utility model, the inner side of the positioning ring is cylindrical or has a groove structure that matches the shape of the transducer rear cover plate.

[0019] In one embodiment of this utility model, the acrylic sound-transmitting window of the sound-transmitting front cover is connected to the aluminum alloy plate by bolts, a sealing ring is provided between the two, and the lower surface of the sound-transmitting window is flush with the lower surface of the aluminum alloy plate.

[0020] In one embodiment of this invention, the acoustically transparent front cover is made of pure acrylic material when only electroacoustic performance is measured.

[0021] In one embodiment of this utility model, the chassis is made of aluminum alloy and is connected to the sealing cylinder by bolts and is provided with a sealing ring.

[0022] In one embodiment of this utility model, the hoisting structure is a flange structure welded to the chassis, used to connect with the lifting and rotating mechanism of the crane.

[0023] In one embodiment of this utility model, the sealing cylinder is an acrylic cylindrical structure.

[0024] Compared with the prior art, the above-mentioned technical solution of this utility model has the following advantages: The pressure-transmitting sound device of this utility model adopts an engineering plastic positioning ring to achieve non-destructive and rapid assembly and disassembly of the transducer, avoiding the disassembly difficulties caused by traditional potting; by pressurizing the cavity to simulate the deep water static pressure environment, cavitation is effectively suppressed, enabling high-power transducers to complete the measurement of key parameters such as sound source level in shallow water anechoic tanks; the integrated hoisting structure facilitates cooperation with the water tank trolley to achieve directional automatic measurement; the matching liquid and the sound-transmitting window are acoustically optimized to ensure efficient sound wave transmission. The overall structure takes into account sealing performance, ease of operation, and measurement accuracy, significantly improving testing efficiency and prototype debugging success rate. Attached Figure Description

[0025] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0026] Figure 1 This is a three-dimensional structural diagram of the detachable pressure sound-transmitting device of this utility model;

[0027] Figure 2 This is an axial front sectional view (AA) of the pressure sound-transmitting device described in this utility model;

[0028] Figure 3 This is a cross-sectional view of the lower part of the pressure sound-transmitting device described in this utility model;

[0029] Figure 4 This is a schematic diagram of the engineering plastic positioning ring in this utility model.

[0030] In the diagram: 1-Sealed cylinder, 2-Sound-permeable front cover, 3-Acrylic sound-permeable window, 4-Aluminum alloy plate, 5-Openable chassis, 6-Positioning ring, 7-Longitudinal transducer under test, 8-Pressure port, 9-Pressure relief port, 10-Through hole, 11-Threaded opening, 12-Pressure gauge, 13-Lifting structure, 14-Fastening bolt, 15-Nut, 16-Watertight connector, 17-Sealing ring. Detailed Implementation

[0031] like Figure 1 and Figure 2 As shown, this embodiment provides a detachable pressure sound transmission device for longitudinal transducer measurement, including a sealed cylinder 1, an openable sound transmission front cover 2, an openable chassis 5, a positioning ring 6, a pressurization port 8, a pressure relief port 9, a pressure gauge 12, a hoisting structure 13, and a watertight connector 16.

[0032] The sealing cylinder 1 is an acrylic cylinder with openings at both ends. Its lower end is connected to the openable chassis 5 through a screw and a sealing ring at the groove. The chassis 5 is made of aluminum alloy.

[0033] The chassis 5 is made of aluminum alloy, and a positioning ring 6 made of engineering plastic is installed in the center. The inner side of the positioning ring 6 is a cylindrical groove that matches the shape of the rear cover plate of the longitudinal transducer 7 under test. The side of the positioning ring 6 is provided with a through hole 10 and a threaded opening 11. The chassis 5 is fixed by bolts passing through the through hole 10, and the rear cover plate of the transducer is tightened by bolts screwed into the threaded opening 11. Figure 4 As shown, this achieves non-destructive mechanical fixation and electrical insulation.

[0034] The openable acoustic front cover 2 is composed of an acrylic acoustic window 3 and an aluminum alloy plate 4, which are pressed together by multiple evenly distributed fastening bolts, with a sealing ring in the middle to ensure high-pressure sealing. The aluminum alloy plate 4 is machined with a pressure port 8, a pressure relief port 9, and a pressure gauge 12. The pressure port 8 is connected to an external pressure pump via a high-pressure hose to apply pressure to the cavity; the pressure relief port 9 is used to release pressure after testing; and the pressure gauge 12 is used to display the cavity pressure value in real time. In addition, a watertight connector 16 is installed on the aluminum alloy plate 4 for leading out the transducer cable and connecting it to an external excitation system.

[0035] The sealed cylinder 1, the sound-permeable front cover 2, and the chassis 5 together form a closed measuring chamber. The chamber is filled with castor oil as an acoustic impedance matching fluid to ensure that sound waves are efficiently transmitted from the transducer through the oil medium and the sound-permeable window to the external water body.

[0036] like Figure 3 As shown, the hoisting structure 13 is welded to the side of the chassis 5, and its end is a flange structure, which can be connected to the lifting and rotating mechanism of the silencing water tank trolley, so as to facilitate the hoisting, positioning and horizontal rotation of the device in the water to complete the directional measurement.

[0037] The specific working process of the pressure-driven acoustic device described in this embodiment is as follows:

[0038] Install the transducer; open the sound-transmitting front cover 2, align the rear cover plate of the longitudinal transducer 7 to be tested with and press it into the positioning ring 6 on the chassis, and tighten the side bolts to fix the transducer.

[0039] Oil filling and sealing: Fill the sealing cylinder 1 with castor oil until full, cover with the sound-permeable front cover 2, and tighten all fastening bolts to ensure the sealing ring is compressed. Lead the transducer cable out through the watertight connector 16 and connect it to the external drive system.

[0040] Pressurization and water immersion: Pressurize the cavity through pressurization port 8 and adjust to the preset pressure (e.g., 0.5 MPa, simulating a water depth of approximately 50 meters). Use a crane to lift the entire device through hoisting structure 13 and slowly immerse it in the silencing water tank.

[0041] Perform measurements; drive the transducer to work under pressure, and measure parameters such as the transducer's emission voltage response, sound source level, and horizontal directivity by moving the hydrophone or rotating the trolley.

[0042] Disassembly and recycling: After the measurement is completed, release the pressure inside the cavity through the pressure relief port 9, open the front cover, drain the castor oil, loosen the positioning ring bolts, and the transducer can be easily removed.

[0043] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A detachable pressure-transmitting acoustic device for longitudinal transducer measurement, characterized in that, include: A sealed cylinder (1) has openings at both ends; An openable acoustic front cover (2) includes an acrylic acoustic window (3) and an aluminum alloy plate (4), which are connected by fastening bolts and press against a sealing ring (17). An openable chassis (5) is connected to the lower end of the sealing cylinder (1) by a sealing ring and fastening bolts, and together with the openable sound-permeable front cover (2) forms a sealed measuring cavity. The positioning ring (6) is made of engineering plastic and is fixed on the chassis (5). Its inner shape is adapted to the outer contour of the rear cover plate of the longitudinal transducer (7) to be tested. The side of the positioning ring (6) is provided with a through hole (10) and a threaded opening (11). It is fixed to the chassis (5) by passing through the through hole (10) with bolts, and the rear cover plate of the transducer is tightened by screwing the bolts into the threaded opening (11). The pressurization port (8) and the pressure relief port (9) are both located on the aluminum alloy plate (4) and are used to connect external pressurization equipment and adjust the pressure inside the cavity; A pressure gauge (12) is mounted on the aluminum alloy plate (4) to display the pressure inside the cavity; The hoisting structure (13) is fixed on the chassis (5) and is used for connecting to the silencing water tank by a vehicle. A watertight connector (16) is provided on the sound-permeable front cover (2) for leading out the transducer cable.

2. The pressure-transmitting acoustic device according to claim 1, characterized in that, Its measuring chamber is filled with a matching fluid whose acoustic impedance is close to that of water.

3. The pressure-transmitting acoustic device according to claim 2, characterized in that, The matching liquid is castor oil.

4. The pressure-transmitting acoustic device according to claim 1, characterized in that, The inner side of the positioning ring (6) is cylindrical or has a groove structure that matches the shape of the transducer rear cover.

5. The pressure-transmitting acoustic device according to claim 1, characterized in that, The acrylic sound-transmitting window (3) of the sound-transmitting front cover (2) is connected to the aluminum alloy plate (4) by bolts, and a sealing ring (17) is provided between the two.

6. The pressure-transmitting acoustic device according to claim 1, characterized in that, The acoustically transparent front cover (2) is made of pure acrylic material when only the electroacoustic performance of the transducer is measured.

7. The pressure-transmitting acoustic device according to claim 1, characterized in that, The chassis (5) is made of aluminum alloy and is bolted to the sealing cylinder (1) and is equipped with a sealing ring.

8. The pressure-transmitting acoustic device according to claim 1, characterized in that, The hoisting structure (13) is a flange structure welded to the chassis (5).

9. The pressure-transmitting acoustic device according to claim 1, characterized in that, The sealing cylinder (1) is an acrylic cylindrical structure.

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