An underwater vibration and sound isolation cabin section structure suitable for a UUV propulsion device

Abstract

An underwater vibration and sound isolation cabin section structure suitable for UUV propulsion device, mainly comprising a fairing cabin body, a tail end cover, a vibration blocking mass, a vibration isolation suspension, a hinge hole screw, and a damping sound absorption plate, a propulsion motor and the like; the structure is used for arranging the UUV propulsion device and greatly weakening the noise radiated by the propulsion device to the surrounding flow field through the shell, mainly realizing the non-rigid connection between the propulsion motor and the boat body structure through the vibration isolation suspension, isolating the direct sound of the propulsion motor through the vacuum layer of the fairing cabin body, supporting the vacuum shell through the vibration blocking mass and isolating the vibration, and attenuating the sound wave energy and inhibiting the inner wall vibration through the damping sound absorption plate on the inner wall surface of the fairing cover. The application has simple and reliable structure, good vibration isolation and sound isolation effect.

Description

Technical Field

[0001] This invention relates to the field of UUV vibration reduction and noise reduction technology, and in particular to an underwater vibration isolation and sound insulation compartment structure suitable for UUV propulsion devices. Background Technology

[0002] When a UUV is operating at low speed underwater, the noise from the propulsion section is the primary source of its underwater radiated noise. UUV propulsion sections often employ a modular integrated design, housing the main mechanical systems in a single section, and are typically designed as a single-shell structure, allowing mechanical noise to radiate directly into the water through the hull. With limited auxiliary equipment, propulsion system noise becomes the most significant noise source and the most effective target characteristic signal for identifying a UUV. Therefore, the stern of the UUV is a key and critical area for vibration and noise radiation control, as the level of structural vibration and sound radiation at this location significantly impacts the overall vibration and sound radiation level of the UUV.

[0003] One study proposed a design method for a motor soundproof enclosure, which uses a heavy enclosure to enclose the motor and lays damping sound-absorbing plates to reduce radiated noise. However, this method adds a significant amount of mass to the aircraft, affecting maneuverability and navigation performance. Furthermore, the motor and the soundproof enclosure are rigidly connected, making it easy for vibrations on the motor surface to be directly transmitted to the enclosure, thus radiating noise and affecting the sound insulation effect.

[0004] Due to the size and weight constraints and compact design of UUVs, it is difficult to afford the application of vibration reduction and sound absorption materials such as floating rafts and sound-absorbing wedges. Traditional vibration isolation treatments and sound-absorbing and sound-insulating material laying measures have limited effectiveness. In order to effectively reduce the radiated noise of the propulsion device, it is necessary to propose an underwater vibration isolation and sound insulation compartment structure suitable for UUV propulsion devices. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies, this disclosure provides an underwater vibration isolation and sound insulation section structure suitable for UUV propulsion devices. The structure is simple, easy to load and unload, low in cost, and can meet the vibration isolation and sound insulation requirements of UUV propulsion devices.

[0006] The vibration isolation and sound insulation section structure disclosed herein mainly includes a rectifier body, a tail end cover, a vibration damping mass block, a vibration isolation suspension, a hinge hole screw, and a propulsion motor.

[0007] The rectifier compartment has a streamlined shape; when assembled with the tail end cover, it forms a semi-enclosed propulsion section with water permeability inside, and the propulsion motor is a water-immersed pressure-resistant motor.

[0008] The inner layer of the rectifier chamber is evacuated, and the vacuum layer can completely cover the length of the motor along the axial direction.

[0009] Vibration damping mass blocks are uniformly arranged along the axial and circumferential directions within the vacuum layer of the rectifier chamber.

[0010] The vibration isolation suspension is used to flexibly connect the propulsion device. The X-shaped vibration isolation suspension is fixed to the inside of the rectifier body by key and keyway cooperation and radially arranged hinged hole screws.

[0011] Preferably, the vibration damping mass block includes a first cylinder, a hollow disk, and a second cylinder, which are coaxially welded together in this order. The first cylinder and the second cylinder are solid structures with the same shape, and the hollow disk is a hollow structure.

[0012] The vibration damping mass block is welded to the vacuum interlayer of the rectifier chamber shell through the outer end face of the first cylinder and the outer end face of the second cylinder.

[0013] Preferably, the vibration damping mass blocks are arranged in 5 rings along the axial direction in the vacuum interlayer of the rectifier chamber, with 8 blocks evenly distributed in each ring.

[0014] Preferably, the vibration damping mass block is made of stainless steel.

[0015] Preferably, the aforementioned vibration isolation suspension includes an annular bracket and four rubber vibration isolators, with the angle between each pair of isolators being 90 degrees; the rubber vibration isolators can bear loads and limit movement in the X, Y, and Z directions. The outer ring of the annular bracket is fixed to the inner wall of the rectifier cabin shell by the fit of a key and a keyway, as well as by radially arranged reamed hole screws.

[0016] Preferably, several vibration isolation suspensions can be provided, distributed in parallel along the axial direction of the rectifier body.

[0017] As a preferred option, damping sound-absorbing panels are also included, which are bonded to the inner wall of the rectifier chamber using high-strength adhesives.

[0018] Compared with the prior art, the beneficial effects of this disclosure are: (1) The compartment structure is compact, easy to assemble, and has high space utilization. It is suitable for noise protection of UUV propulsion devices, can effectively reduce the vibration noise of propulsion devices, and improve the overall self-noise level of UUV platforms.

[0019] (2) The rectifier cabin utilizes its internal vacuum layer to control the propulsion motor radiated noise within the cabin section, greatly reducing the noise radiation to the outside of the cabin. Combined with the damping sound-absorbing plate on the inner wall of the rectifier cabin, it can effectively suppress the vibration of the inner wall and absorb the reverberation inside the cabin.

[0020] (3) The vibration damping mass block can support the vacuum layer and reflect and dissipate the vibration wave energy transfer from the inner shell of the rectifier cabin to the outer shell. The density, damping and other parameters of the vibration damping mass block are constants, and its vibration isolation performance can be accurately calculated by software, making it highly designable.

[0021] (4) The X-shaped vibration isolation suspension realizes the non-rigid connection between the propulsion motor and the UUV structure. Without changing the structural characteristics, the diameter of the ring bracket and the model of the vibration isolator can be changed to adapt to motors of various sizes. It has high applicability and can be widely promoted. Attached Figure Description

[0022] The above and other objects, features and advantages of this disclosure will become more apparent from the more detailed description of exemplary embodiments of this disclosure taken in conjunction with the accompanying drawings, in which the same reference numerals generally represent the same components.

[0023] Figure 1 This is a schematic diagram of an exemplary underwater vibration isolation and sound insulation compartment structure suitable for UUV propulsion devices;

[0024] Figure 2 This is a schematic diagram of an exemplary vibration-damping mass block structure;

[0025] Figure 3 This is a schematic diagram of the radial cross-sectional structure of the rectifier cabin at an exemplary vibration isolation suspension.

[0026] Among them: 1-rectifier cabin, 2-tail end cover, 3-vibration damping mass block, 301-first cylinder, 302-cavity disk, 303-second cylinder, 4-damping sound-absorbing plate, 5-X-shaped vibration isolation suspension, 501-ring bracket, 502-rubber vibration isolator, 6-ream hole screw, 7-propulsion motor. Detailed Implementation

[0027] Preferred embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While preferred embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art.

[0028] This disclosure provides an underwater vibration and sound insulation compartment structure suitable for UUV propulsion devices, an exemplary embodiment of which is attached. Figure 1 As shown, it mainly includes: 1. Rectifier cabin, 2. Tail end cover, 3. Vibration damping mass block, 4. Damping sound-absorbing plate, 5. X-shaped vibration isolation suspension, 6. Hinge hole screw, and 7. Propulsion motor.

[0029] (1) The rectifier body 1 has a streamlined shape and is made of titanium alloy. The vacuum layer can completely cover the length of the motor along the axial direction. After the rectifier body 1 and the titanium alloy tail cover 2 are assembled, they form a semi-enclosed propulsion section, and the propulsion motor 7 is in direct contact with the water. Based on this structure, the radiated noise caused by the vibration of the propulsion motor 7 housing excites the water medium and the electromagnetic noise generated by the propulsion motor 7 can be effectively blocked and reflected back into the rectifier body 1. There are 4 keys on the ring rib at the position where the X-shaped vibration isolation suspension 5 is installed on the rectifier body 1, which are used to fix the X-shaped vibration isolation suspension 5 in the circumference and transmit torque.

[0030] (2) The vibration damping mass block 3 is made of stainless steel, such as Figure 2 As shown, the system comprises a first cylinder 301, a hollow disk 302, and a second cylinder 303, which are coaxially welded together in this order. The first cylinder 301 is welded to the interior of the rectifier compartment 1 via its upper end face and the second cylinder 303's lower end face, serving as vibration isolation and support. Therefore, the thickness of the inner and outer shells of the rectifier compartment 1 can be significantly reduced, achieving weight reduction advantages. The first cylinder 301 and the second cylinder 303 are both solid cylindrical structures, while the hollow disk 302 is a closed cylindrical shell structure with air filling the space between them. Preferably, the vibration-damping mass blocks 3 are arranged in five rings along the axial direction in the vacuum layer of the rectifier compartment 1, with eight blocks evenly distributed at 45° intervals in each ring.

[0031] The vibration damping mechanism of the vibration damping mass block 3 includes the following three aspects: the impedance at the interface of the first cylinder 301, the cavity disk 302, and the second cylinder 303 structure changes abruptly, forming a bending wave reflection; the cavity disk 302 structure increases the rotation angle, which aggravates the impedance mismatch of the structure; the vibration wave is first decomposed into two transmission paths along the cavity disk 302, and when they converge, they can be superimposed to cause partial energy cancellation.

[0032] (3) Due to the compact installation structure, there is a large amount of space on the inner wall of the rectifier 1 for the damping sound-absorbing plate 4. Therefore, the damping sound-absorbing plate 4 is pasted on the inner wall as much as possible with high-strength adhesive. The damping sound-absorbing plate 4 has the dual functions of sound absorption and vibration reduction, which can effectively absorb the noise radiated by the motor and suppress the vibration of the application part.

[0033] (4) such as Figure 3 As shown, the X-shaped vibration isolation suspension 5 consists of a ring bracket 501 and rubber vibration isolators 502. The rubber vibration isolators 502 have multi-directional limiting and load-bearing capabilities. The angle between the isolators is 90°, and they are arranged symmetrically in an X-shape within the ring bracket 501. One end of the suspension is installed to the motor end plate with four bolts, and the other end is connected to the rectifier body 1 with eight reamed hole screws 6. The reamed hole screws 6 have strong lateral load-bearing capacity, thus able to withstand the thrust generated when the propulsion motor 7 is working. Simultaneously, the reamed hole screws 6 should be offset from the vibration-damping mass block 3 by 22.5°. Figure 3It can be seen that the suspension should be axially aligned with the UUV propulsion motor 7 to ensure vibration isolation.

[0034] The above technical solutions are merely exemplary embodiments of the present invention. For those skilled in the art, based on the application methods and principles disclosed in the present invention, it is easy to make various types of improvements or modifications, and not limited to the methods described in the specific embodiments of the present invention. Therefore, the methods described above are only preferred and not restrictive.

Claims

1. A structure for an underwater vibration isolation and sound insulation compartment suitable for a UUV propulsion device, characterized in that, include: The fairing hull, tail cap, vibration damping mass, and vibration isolation suspension; among which: The fairing has a streamlined shape. When assembled with the tail cap, the fairing forms a semi-enclosed propulsion section for housing the propulsion motor. The rectifier cabin shell is equipped with a vacuum interlayer that covers the length of the propulsion motor along the axial direction; Vibration-damping mass blocks are arranged along the axial and / or circumferential directions inside the vacuum interlayer, and the two ends of the vibration-damping mass blocks support the two side walls of the vacuum interlayer respectively. The vibration isolation suspension is ring-shaped and radially fixed to the inner wall of the rectifier compartment. X-shaped vibration isolators are installed inside the ring, and the end of the vibration isolator pointing to the center of the ring is fixed to the propulsion motor. The vibration isolation suspension and the propulsion motor are axially aligned. The vibration damping mass block includes: a first cylinder, a hollow disk, and a second cylinder, which are coaxially welded together in sequence. The first cylinder and the second cylinder are solid structures with the same shape, and the hollow disk is a hollow structure. The vibration damping mass block is welded to the vacuum interlayer of the rectifier chamber shell through the outer end face of the first cylinder and the outer end face of the second cylinder. The vibration isolation suspension includes: a ring bracket and four X-shaped rubber vibration isolators, with the angle between each pair of vibration isolators being 90 degrees; The outer ring of the annular bracket is fixed to the inner wall of the rectifier cabin shell by the cooperation of a key and a keyway, as well as by radially arranged reamed hole screws.

2. The structure according to claim 1, characterized in that, The vibration damping mass blocks are arranged in 5 rings along the axial direction in the vacuum interlayer of the rectifier chamber, with 8 blocks evenly distributed in each ring.

3. The structure according to claim 1 or 2, characterized in that, The vibration damping mass block is made of stainless steel.

4. The structure according to claim 1, characterized in that, It includes several vibration isolation suspensions, distributed along the axial direction of the rectifier body.

5. The structure according to claim 1, characterized in that, Also includes: Damping sound-absorbing panels are bonded to the inner wall of the rectifier compartment.

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