Double-layer flexible vibration isolation device for ship sonar system

Abstract

The application discloses a double-layer flexible vibration isolation device for a ship sonar system, and relates to the technical field of sonar vibration isolation.The double-layer flexible vibration isolation device comprises an outer plate assembly, an intermediate vibration isolation frame and an inner plate assembly.The outer plate assembly comprises at least three outer frame connecting plates.The inner plate assembly comprises at least three array support plates.The intermediate vibration isolation frame comprises a plurality of inner side walls and a plurality of outer side walls, each of the inner side walls and the outer side walls is distributed in a circumferential direction around an axis of the intermediate vibration isolation frame, and the inner side walls and the outer side walls are in one-to-one correspondence.The array support plates are distributed on the inner side of the intermediate vibration isolation frame and in one-to-one correspondence with the inner side walls, and the array support plates and the inner side walls are connected through two symmetrical S-shaped flexible beams.The S-shaped flexible beam has an inner connecting end and an outer connecting end, the distance between the two inner connecting ends on the array support plate is different from the distance between the two outer connecting ends on the inner side wall, and the natural frequency of the S-shaped flexible beam is lower than the natural frequency of the first flexible connecting piece.The double-layer flexible vibration isolation device can provide high-performance vibration isolation and meet the application of limited installation space.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sonar vibration isolation, in particular to a double-layer flexible vibration isolation device for a ship sonar system. BACKGROUND

[0002] The ship sonar system is particularly sensitive to environmental vibration, because the sonar array is usually installed in the cabin or the hull, and is easily disturbed by low-frequency vibration of equipment such as the main engine, shafting and rudder. Moreover, with the continuous evolution of modern sonar technology towards higher sensitivity, wider frequency band and lower self-noise level, higher requirements are put forward for the stability of the operating environment.

[0003] The actual vibration faced by the ship sonar system is not single direction, and the equipment in the cabin section of the modern ship is dense, and the sonar installation space is limited. However, most of the existing vibration isolation structures for the ship sonar system adopt a single type of vibration isolation structure, which cannot simultaneously satisfy the condition of better vibration isolation effect and small size to adapt to the limited installation space of the ship sonar cabin. SUMMARY

[0004] The purpose of the present application is to provide a double-layer flexible vibration isolation device for a ship sonar system to solve the problems existing in the prior art, provide high-performance vibration isolation, and meet the application of limited installation space.

[0005] To achieve the above purpose, the present application provides the following solutions:

[0006] The application provides a double-layer flexible vibration isolation device for a ship sonar system, which comprises an outer plate assembly, an intermediate vibration isolation frame and an inner plate assembly; the outer plate assembly comprises at least three outer frame connecting plates, each of which is used for fixed connection with a ship body structure; the inner plate assembly comprises at least three array support plates, each of which is used for fixed connection with a sonar array module; the intermediate vibration isolation frame comprises a plurality of inner side walls and a plurality of outer side walls, each of the inner side walls is distributed in a circumferential direction of an axis of the intermediate vibration isolation frame, and each of the outer side walls is distributed in the circumferential direction of the axis of the intermediate vibration isolation frame, the inner side walls correspond to the outer side walls one by one; each of the outer frame connecting plates is distributed on an outer side of the intermediate vibration isolation frame, the outer frame connecting plates correspond to the outer side walls one by one, and the outer frame connecting plates and the outer side walls are connected through two symmetrical first flexible connecting pieces; the first flexible connecting pieces have opposite first connecting ends and second connecting ends; in a direction in which the outer frame connecting plate is close to or far away from the outer side wall, the first connecting ends and the second connecting ends have a buffer space therebetween; each of the array support plates is distributed on an inner side of the intermediate vibration isolation frame, the array support plates correspond to the inner side walls one by one, and the array support plates and the inner side walls are connected through two symmetrical S-shaped flexible beams; the S-shaped flexible beams have inner connecting ends used for connection with the array support plates and outer connecting ends used for connection with the inner side walls; on the array support plate, a spacing between the inner connecting end connection points of the two S-shaped flexible beams is a first spacing, on the inner side wall, a spacing between the outer connecting end connection points of the two S-shaped flexible beams is a second spacing, and the first spacing is different from the second spacing; the natural frequency of the S-shaped flexible beam is lower than the natural frequency of the first flexible connecting piece.

[0007] Preferably, the first flexible connecting piece has a U-shaped cross section, and the U-shaped cross section has two connecting branches at two ends thereof; in the direction in which the outer frame connecting plate is close to or far away from the outer side wall, the two connecting branches at the two ends of the U-shaped cross section are located on the same surface.

[0008] Preferably, in the axis direction of the intermediate vibration isolation frame, one end of each of the outer frame connecting plates is fixed on a mounting base; the mounting base is used for fixed connection with the ship body structure.

[0009] Preferably, in the axis direction of the intermediate vibration isolation frame, the lengths of the first flexible connecting piece, the intermediate vibration isolation frame and the S-shaped flexible beam are the same.

[0010] Preferably, a middle part of the mounting base is provided with a relief through hole; and in the axis direction of the intermediate vibration isolation frame, one end of the first flexible connecting piece, the intermediate vibration isolation frame and the S-shaped flexible beam close to the mounting base has the same spacing with the mounting base.

[0011] Preferably, the number of the outer frame connecting plates and the array supporting plates is 4, two of the outer frame connecting plates are oppositely arranged, and two of the array supporting plates are oppositely arranged.

[0012] The present application has the following technical effects relative to the prior art:

[0013] The application provides a double-layer flexible vibration isolation device for a ship sonar system, which is fixed to a ship body structure through at least three outer frame connecting plates in an outer plate assembly to provide a stable installation base for the overall device; the outer side wall of an intermediate vibration isolation frame is connected through two symmetrical first flexible connecting pieces, and the first connecting end and the second connecting end of the first flexible connecting piece are provided with a buffer air gap in the direction close to or away from the outer side wall, so that the first flexible connecting piece can adapt to transverse deformation through the buffer air gap, and the outer frame connecting plate is connected to a plurality of groups of first flexible connecting pieces which are symmetrically distributed and arranged in a peripheral direction outside the intermediate vibration isolation frame, so that the multi-directional vibration transmitted by the ship body can be effectively absorbed, the first flexible connecting piece has a relatively low equivalent stiffness in the horizontal direction perpendicular to the axis of the intermediate vibration isolation frame, and the natural frequency thereof is relatively high, so that the high-frequency vibration in the horizontal direction is effectively isolated; meanwhile, the first flexible connecting piece has a relatively high stiffness in the vertical direction parallel to the axis of the intermediate vibration isolation frame, so as to play a guiding role in limiting the vertical inclination and attitude deviation; the first flexible connecting piece can directly absorb vibration energy through the elastic deformation of the buffer air gap, and adjacent connecting pieces can assist in constraining vibration propagation; the intermediate vibration isolation frame is in one-to-one correspondence with the inner side wall and the outer side wall, so as to construct a transition connection structure of the outer plate assembly and the inner plate assembly, provide stable frame support for double-layer vibration isolation, and simultaneously serve as a fixed boundary of each S-shaped flexible beam in the inner layer; at least three array support plates in the inner plate assembly are fixed to a sonar array module, and the inner side wall of the intermediate vibration isolation frame is connected through two symmetrical S-shaped flexible beams to form a second-stage vibration isolation structure; the S-shaped structure itself has excellent elastic deformation capability, has extremely low dynamic stiffness in the horizontal direction perpendicular to the axis of the intermediate vibration isolation frame, has strong low-frequency vibration isolation capability, significantly attenuates low-frequency vibration generated by a main machine, a shaft system and the like through large and reversible elastic deformation under low-frequency excitation, and solves the core problem that the sonar system is sensitive to low-frequency vibration; the first flexible connecting piece of the outer layer and the S-shaped flexible beam of the inner layer jointly construct a two-stage flexible vibration isolation channel to form composite vibration isolation; in combination with modal response, force flow continuity and vibration energy transmission mechanism, different frequency bands of vibration loads are shared through each stage to achieve a broadband vibration suppression effect; and the compact layout of the outer plate assembly, the intermediate vibration isolation frame and the inner plate assembly directly connects each component through the connecting piece without redundant external structures, so that the multi-directional vibration isolation coverage is ensured, the structure is compact, the overall device volume is greatly compressed, the scene that the equipment is dense in the modern ship cabin section and the sonar installation space is limited is perfectly adapted, and finally the dual goals of effective multi-directional vibration isolation and small-size installation adaptation are realized, so as to meet the high requirements of a modern high-sensitivity, wide-band, low-self-noise sonar system on the stability of an operating environment. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to make the technical solutions in the embodiments of the present application or the prior art clearer, the accompanying drawings needed in the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description only need to be some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the premise of the accompanying drawings.

[0015] Fig. 1 The overall structure schematic diagram of the double-layer flexible vibration isolation device for the ship sonar system provided by the present application is shown in the figure.

[0016] Fig. 2 The structure schematic diagram of the double-layer flexible vibration isolation device for the ship sonar system provided by the present application is shown in the figure.

[0017] Fig. 3 The front view of the double-layer flexible vibration isolation device for the ship sonar system provided by the present application is shown in the figure.

[0018] In the figure: 1- mounting base; 2- outer frame connecting plate; 3- first flexible connecting piece; 4- intermediate vibration isolation frame; 5- array support plate; 6- S-shaped flexible beam; 7- buffer air gap. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without any creative effort belong to the scope of protection of the present application.

[0020] The purpose of the present application is to provide a double-layer flexible vibration isolation device for a ship sonar system to solve the problems in the prior art, provide high-performance vibration isolation, and meet the application of limited installation space.

[0021] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Embodiment one

[0023] The present embodiment provides a double-layer flexible vibration isolation device for a ship sonar system, which is particularly suitable for such application scenarios as ship sonar systems that are sensitive to low-frequency vibration and have limited installation space, such as Figs. 1-3As shown, the sonar array module includes an outer plate assembly, a middle vibration isolation frame 4, and an inner plate assembly; the outer plate assembly includes at least three outer frame connecting plates 2, each outer frame connecting plate 2 is used for fixed connection with the ship body structure; the inner plate assembly includes at least three array support plates 5, each array support plate 5 is used for fixed connection with the sonar array module; the middle vibration isolation frame 4 includes a plurality of inner side walls and a plurality of outer side walls, each inner side wall is distributed circumferentially around the axis of the middle vibration isolation frame 4, and each outer side wall is distributed circumferentially around the axis of the middle vibration isolation frame 4, the inner side wall and the outer side wall correspond one by one; each outer frame connecting plate 2 is distributed on the outer side of the middle vibration isolation frame 4, the outer frame connecting plate 2 and the outer side wall correspond one by one, and the outer frame connecting plate 2 and the outer side wall are connected through two symmetrical first flexible connecting pieces 3; the first flexible connecting piece 3 has opposite first and second connecting ends; in the direction of the outer frame connecting plate 2 approaching or moving away from the outer side wall, the first and second connecting ends have a buffer space 7 therebetween; each array support plate 5 is distributed on the inner side of the middle vibration isolation frame 4, the array support plate 5 and the inner side wall correspond one by one, and the array support plate 5 and the inner side wall are connected through two symmetrical S-shaped flexible beams 6; the S-shaped flexible beam 6 has an inner connecting end for connecting with the array support plate 5 and an outer connecting end for connecting with the inner side wall; on the array support plate 5, the spacing between the inner connecting end connecting points of the two S-shaped flexible beams 6 is a first spacing, and on the inner side wall, the spacing between the outer connecting end connecting points of the two S-shaped flexible beams 6 is a second spacing, the first spacing and the second spacing are different; the natural frequency of the S-shaped flexible beam 6 is lower than the natural frequency of the first flexible connecting piece 3.

[0024] The at least three outer frame connecting plates 2 in the outer plate assembly are fixed to the hull structure to provide a stable mounting base for the overall device; the outer side wall of the intermediate vibration isolation frame 4 is connected through two symmetric first flexible connecting pieces 3, and the first connecting end and the second connecting end of the first flexible connecting piece 3 are provided with a buffer air gap 7 in the direction close to or away from the outer side wall, which forms a first level vibration isolation structure of the outer layer, so that the first flexible connecting piece 3 can adapt to the transverse deformation through the buffer air gap 7, and the symmetric distribution characteristics and the outer circumferential arrangement of multiple groups of first flexible connecting pieces 3 connected with the outer frame connecting plate 2 can effectively absorb the multi-directional vibration transmitted by the hull. In the horizontal direction perpendicular to the axis of the intermediate vibration isolation frame 4, the first flexible connecting piece 3 has a relatively low equivalent stiffness, and its natural frequency is relatively high, which effectively isolates the high-frequency vibration in the horizontal direction; at the same time, in the vertical direction parallel to the axis of the intermediate vibration isolation frame 4, the first flexible connecting piece 3 maintains a high stiffness, which plays a guiding role in limiting the vertical inclination and attitude deviation; the first flexible connecting piece 3 can directly absorb vibration energy through the elastic deformation of the buffer air gap 7, and the adjacent connecting pieces can assist in constraining vibration propagation; the intermediate vibration isolation frame 4 is distributed in one-to-one correspondence through the inner side wall and the outer side wall, which constructs a transition connection structure of the outer plate assembly and the inner plate assembly, provides stable frame support for double-layer vibration isolation, and at the same time serves as a fixed boundary for each S-shaped flexible beam 6 in the inner layer; the at least three array support plates 5 in the inner plate assembly are fixed to the sonar array module, which is connected through two symmetric S-shaped flexible beams 6 with the inner side wall of the intermediate vibration isolation frame 4 to form a second level vibration isolation structure; the S-shaped structure itself has excellent elastic deformation capability, which has extremely low dynamic stiffness in the horizontal direction perpendicular to the axis of the intermediate vibration isolation frame 4, and has strong low-frequency vibration isolation capability. Under low-frequency excitation, it significantly attenuates the low-frequency vibration generated by the main machine, shafting and other equipment through large and reversible elastic deformation, solving the core problem that the sonar system is sensitive to low-frequency vibration; the first flexible connecting piece 3 of the outer layer and the S-shaped flexible beam 6 of the inner layer jointly construct a two-level flexible vibration isolation channel to form a composite vibration isolation; combined with modal response, force flow continuity and vibration energy transmission mechanism, different frequency bands of vibration load are shared through each level to achieve a wideband suppression effect on structural vibration; and the compact layout of the outer plate assembly, the intermediate vibration isolation frame 4 and the inner plate assembly, and the direct connection of each component through the connecting piece without redundant external structure, ensures the coverage of multi-directional vibration isolation while the structure is compact, which greatly compresses the overall device volume, perfectly adapts to the scene of dense equipment in modern ship cabin section and limited sonar installation space, and finally realizes the dual goals of effective isolation of multi-directional vibration and small volume installation adaptation, meeting the high requirements of modern high-sensitivity, wideband and low-self-noise sonar system on the stability of operating environment.

[0025] Specifically, the outer layer first flexible connecting piece 3 and the inner layer S-shaped flexible beam 6 jointly constitute a coaxial clamping cavity, realizing symmetrical clamping and pre-tightening of the sonar array module, avoiding rigid connection introduced by additional clamping structures, improving the structural integration and performance consistency of the overall vibration isolation system, and further reducing the structural vibration transmission risk.

[0026] Among them, the related setting of the outer plate assembly is as follows:

[0027] In the optional scheme of the embodiment, preferably, as shown in Figs. 1-3 In the axial direction of the intermediate vibration isolation frame 4, one end of each outer frame connecting plate 2 is fixed on the mounting base 1; the mounting base 1 is used for fixed connection with the ship body structure.

[0028] In the optional scheme of the embodiment, preferably, as shown in Fig. 1 and Fig. 2 The middle part of the mounting base 1 is provided with a avoiding through hole; and in the axial direction of the intermediate vibration isolation frame 4, the first flexible connecting piece 3, the intermediate vibration isolation frame 4 and the S-shaped flexible beam 6 close to one end of the mounting base 1 all have the same spacing with the mounting base 1.

[0029] Among them, the related setting of the first flexible connecting piece 3 is as follows:

[0030] In the optional scheme of the embodiment, preferably, as shown in Figs. 1-3 The cross section of the first flexible connecting piece 3 is U-shaped, and the two ends of the U-shaped structure have connecting branches; in the direction of the outer frame connecting plate 2 close to or away from the outer side wall, the two connecting branches of the two ends of the U-shaped structure are located on the same surface. The elastic deformation characteristics of the U-shaped structure strengthen the horizontal low stiffness advantage, improve the absorption capacity of the medium and high frequency vibration, and the connecting branches on the same surface ensure that the force transmission path between the outer frame connecting plate 2 and the outer side wall of the intermediate vibration isolation frame 4 is straight, avoiding uneven vibration transmission or local stress concentration caused by branch misplacement, and the compact form of the U-shaped structure can also reduce the occupied space of the connecting piece in the device, further adapting to the volume constraint of the ship sonar cabin.

[0031] Among them, the related setting of the S-shaped flexible beam 6 is as follows:

[0032] Specifically, a plurality of S-shaped flexible beam 6 structures are adopted, based on the quasi-zero stiffness principle, low dynamic stiffness characteristics are presented near the structural deformation balance point, quasi-zero stiffness response is realized, the system equivalent natural frequency is effectively reduced, the low frequency vibration isolation capacity is improved, and it is suitable for high sensitivity sonar equipment in complex low frequency excitation environment.

[0033] Among them, the related setting of the S-shaped flexible beam 6 is as follows:

[0034] In the optional scheme of the embodiment, preferably, as shown in Figs. 1-2As shown, the lengths of the first flexible connecting member 3, the intermediate vibration isolation frame 4 and the S-shaped flexible beam 6 are the same in the axial direction of the intermediate vibration isolation frame 4. The three are cooperated in the same axial height to avoid the constraint of high and low dislocation, effectively inhibit the tilt and deflection of the sonar array, and strengthen the stability of the running posture.

[0035] In the optional solution of the embodiment, preferably, as shown in the figure, Figs. 1-3 As shown, the number of the outer frame connecting plates 2 and the array support plates 5 is 4, two outer frame connecting plates 2 are oppositely arranged, and two array support plates 5 are oppositely arranged.

[0036] Specifically, the vibration isolation function is realized by adopting a double-layer flexible structure, wherein the outer layer is four pairs of symmetrically arranged first flexible connecting members 3, which mainly provide flexible isolation for the vibration in the transverse direction, and have high rigidity in the vertical direction, so as to limit the posture deviation such as pitch and yaw of the sonar array module, and improve the stability of the system; the inner layer is four pairs of symmetrically arranged S-shaped flexible beams 6, which constitute a low dynamic stiffness vibration isolation structure, and are used for isolating low-frequency vibration in the plane direction. The double-layer structure is coaxially arranged and cooperated, and effectively decouples and isolates in the multi-degree-of-freedom space.

[0037] The principles and implementation modes of the present application are described by using specific examples in the present application; the above embodiment is only used to help understand the method and core idea of the present application; meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation mode and application range will be changed. In conclusion, the content of the present application should not be understood as the limitation of the present application.

Claims

1. A double-layer flexible vibration isolation device for a shipborne sonar system, characterized in that: Includes outer panel assembly, intermediate vibration isolation frame and inner panel assembly; The outer plate assembly includes at least three outer frame connecting plates, each of which is used for fixed connection with the hull structure; the inner plate assembly includes at least three array support plates, each of which is used for fixed connection with the sonar array module. The intermediate vibration isolation frame includes multiple inner sidewalls and multiple outer sidewalls. Each inner sidewall is circumferentially distributed around the axis of the intermediate vibration isolation frame, and each outer sidewall is circumferentially distributed around the axis of the intermediate vibration isolation frame. The inner sidewalls and the outer sidewalls correspond one-to-one. Each of the outer frame connecting plates is distributed on the outside of the middle vibration isolation frame. Each outer frame connecting plate corresponds to one of the outer side walls. The outer frame connecting plates and the outer side walls are connected by two symmetrical first flexible connectors. Each first flexible connector has a first connecting end and a second connecting end. In the direction where the outer frame connecting plate is close to or away from the outer side wall, there is a buffer gap between the first connecting end and the second connecting end. Each of the array support plates is distributed on the inner side of the intermediate vibration isolation frame, and each array support plate corresponds to one of the inner sidewalls. The array support plates and the inner sidewalls are connected by two symmetrical S-shaped flexible beams. Each S-shaped flexible beam has an inner connecting end for connecting with the array support plate and an outer connecting end for connecting with the inner sidewall. On the array support plate, the distance between the connection points of the inner connecting ends of the two S-shaped flexible beams is a first distance, and on the inner sidewall, the distance between the connection points of the outer connecting ends of the two S-shaped flexible beams is a second distance. The first distance and the second distance are different. The natural frequency of the S-shaped flexible beam is lower than the natural frequency of the first flexible connector; The first flexible connector has a U-shaped cross-section, and the two ends of the U-shape have connecting branches respectively; in the direction of the outer frame connecting plate near or away from the outer side wall, the two connecting branches at both ends of the U-shape are located on the same plane; Along the axial direction of the intermediate vibration isolation frame, one end of each of the outer frame connecting plates is fixed to the mounting base; the mounting base is used for fixed connection with the hull structure. In the axial direction of the intermediate vibration isolation frame, the first flexible connector, the intermediate vibration isolation frame, and the S-shaped flexible beam have the same length; The mounting base has a through hole in the middle; and in the axial direction of the middle vibration isolation frame, the first flexible connector, the middle vibration isolation frame and the end of the S-shaped flexible beam near the mounting base all have the same distance from the mounting base.

2. The double-layer flexible vibration isolation device for a ship sonar system according to claim 1, characterized in that: The number of outer frame connecting plates and array support plates are both four, with two outer frame connecting plates arranged opposite each other and two array support plates arranged opposite each other.

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