Vibration reduction and isolation bulkhead structure of underwater vehicle and design method of vibration reduction and isolation bulkhead structure

Abstract

The invention relates to a vibration reduction and isolation bulkhead structure of an underwater vehicle and a design method thereof, the vibration reduction and isolation bulkhead structure comprises a bulkhead main body panel, the bulkhead main body panel comprises an equipment mounting part, a core adjacent equipment part, a middle transition part and a peripheral vehicle connecting part which are arranged from inside to outside; the inner ring vibration-resistant ring is arranged between the core adjacent equipment part and the middle transition part; the outer ring vibration damping ring is arranged between the middle transition part and the peripheral aircraft connecting part; the inner groove of the inner ring vibration-resistant ring and the inner ring rotating groove form an inner ring integral rotating groove, and the inner groove of the outer ring vibration-resistant ring and the outer ring rotating groove form an outer ring integral rotating groove; a sleeve chain type vibration isolation ring is fixed in the inner ring integral rotating groove and the outer ring integral rotating groove; composite damping materials are laid on the surfaces of the sides, away from the inner ring rotating groove and the outer ring rotating groove, of the core adjacent equipment part and the middle transition part. According to the invention, underwater radiation noise generated by operation of mechanical equipment mounted on the bulkhead can be greatly reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of ship stealth, and in particular to a vibration-damping and isolating bulkhead structure for an underwater vehicle and a design method thereof. Background Art

[0002] The parallel midsection main structure of an underwater vehicle generally adopts a cylindrical hull type. To meet the requirements of functional zoning and watertightness, the interior of the main hull is divided into multiple compartments with different functional positioning. Each compartment is connected by a bulkhead structure; at the same time, mechanical equipment is hung on the bulkhead. The source vibration excitation generated by the operation of the mechanical equipment will propagate along the bulkhead structure to the main hull structure, causing the main hull structure to vibrate, and then excite the water body in contact with the wet surface of the hull to cause underwater radiation noise. As the noise of the main engine and propulsion system of underwater vehicles continues to decrease, the contribution of underwater noise caused by equipment mounted on the bulkhead to the total noise becomes more prominent, especially the characteristic line spectrum generated by the rated operation of the equipment. Reducing this noise component has become an important part of the acoustic stealth design of underwater vehicles.

[0003] The traditional underwater vehicle bulkhead structure generally includes bulkhead panels and longitudinal and transverse reinforcement ribs. There is no special vibration reduction and isolation design for the mechanical equipment installed thereon. Most of the vibration energy generated by the mechanical equipment is transmitted to the main shell, causing underwater radiation noise.

[0004] To this end, we propose a vibration isolation bulkhead structure for underwater vehicles and its design method. Summary of the Invention

[0005] In response to the shortcomings of the above-mentioned existing production technology, the applicant provides an underwater vehicle vibration reduction and isolation bulkhead structure and a design method thereof, which can significantly reduce the underwater radiation noise generated by the operation of mechanical equipment installed on the bulkhead.

[0006] The technical solutions adopted in the present invention are as follows:

[0007] A vibration-isolating bulkhead structure for an underwater vehicle, comprising:

[0008] The bulkhead main panel includes an equipment installation portion, a core adjacent equipment portion, an intermediate transition portion, and a peripheral aircraft connection portion arranged from the inside to the outside;

[0009] The inner ring vibration damping ring is set between the core adjacent equipment part and the middle transition part;

[0010] The outer vibration damping ring is arranged between the middle transition part and the outer vehicle connection part;

[0011] The inner ring vibration-blocking ring and the outer ring vibration-blocking ring are located on one side of the bulkhead main panel, and the inner ring rotation groove and the outer ring rotation groove are provided on the side of the bulkhead main panel away from the inner ring vibration-blocking ring and the outer ring vibration-blocking ring. The inner ring rotation groove is provided between the core adjacent equipment part and the middle transition part, and the outer ring rotation groove is provided between the middle transition part and the peripheral vehicle connection part.

[0012] An inner groove is provided on the side of the inner ring vibration-damping ring close to the inner ring rotation groove; an inner groove is also provided on the side of the outer ring vibration-damping ring close to the outer ring rotation groove; the inner groove of the inner ring vibration-damping ring and the inner ring rotation groove form an inner ring integral rotation groove, and the inner groove of the outer ring vibration-damping ring and the outer ring rotation groove form an outer ring integral rotation groove; a chain-type vibration isolation ring is fixed in the inner ring integral rotation groove and the outer ring integral rotation groove;

[0013] Composite damping material is applied on the surface of the core adjacent to the equipment portion and the middle transition portion away from the inner ring rotating groove and the outer ring rotating groove.

[0014] It is further characterized by:

[0015] The center of the equipment installation part is O 101 , the center of the bulkhead main panel is O 100 ; Inner ring vibration damping ring is O 101 As the center of the circle, the outer vibration damping ring is O 100 is the center of the circle.

[0016] The intermediate transition portion includes a first vibration damping function portion, a second vibration damping function portion, a third vibration damping function portion, a fourth vibration damping function portion, a fifth vibration damping function portion, a sixth vibration damping function portion, a seventh vibration damping function portion and an eighth vibration damping function portion.

[0017] The bulkhead main body panel is provided with a reinforcing rib on a side away from the inner vibration damping ring.

[0018] The present application also discloses a method for designing a vibration-isolating bulkhead structure for an underwater vehicle, comprising the following steps:

[0019] Step 1: The bulkhead main panel includes an equipment installation portion, a core adjacent equipment portion, an intermediate transition portion, and an outer vehicle connection portion arranged from the inside out; an inner vibration damping ring is arranged between the core adjacent equipment portion and the intermediate transition portion; an outer vibration damping ring is arranged between the intermediate transition portion and the outer vehicle connection portion; the equipment installation portion is determined by a rectangle formed by the maximum length and maximum width of the projection of the equipment installed on the bulkhead on the bulkhead main panel, and the center of the rectangle is the center of the equipment installation portion. 101 ;

[0020] Step 2: An inner ring rotation groove is provided on the side of the bulkhead main panel away from the inner ring vibration-proof ring, and an outer ring rotation groove is provided on the side of the bulkhead main panel away from the outer ring vibration-proof ring; an inner groove is provided on the side of the inner ring vibration-proof ring close to the inner ring rotation groove, and an inner groove is also provided on the side of the outer ring vibration-proof ring close to the outer ring rotation groove; the inner grooves of the inner ring vibration-proof ring are aligned with the edges of the inner ring rotation groove, and the inner grooves of the outer ring vibration-proof ring are aligned with the edges of the outer ring rotation groove; the inner grooves of the inner ring vibration-proof ring and the inner ring rotation groove form an inner ring integral rotation groove, and the inner grooves of the outer ring vibration-proof ring and the outer ring rotation groove form an outer ring integral rotation groove;

[0021] Step 3: A set of chain-type vibration isolation rings are fixed in the integral rotation groove of the inner ring and the integral rotation groove of the outer ring. The chain-type vibration isolation ring is a chain structure composed of cylindrical sleeves made of phononic crystal material cross-stacked, and the whole is in a circular ring state.

[0022] Step 4: Draw an O line through the center of the bulkhead body panel 100 and the center of the equipment installation department O 101 The first auxiliary straight line L1; the first auxiliary straight line L1 is the center of the equipment installation part O 101 The second auxiliary straight line L2, the third auxiliary straight line L3 and the fourth auxiliary straight line L4 are generated by rotating at 45° every time within the plane of the bulkhead main panel as the center; the surface of the middle transition part is divided into a first vibration reduction functional part, a second vibration reduction functional part, a third vibration reduction functional part, a fourth vibration reduction functional part, a fifth vibration reduction functional part, a sixth vibration reduction functional part, a seventh vibration reduction functional part and an eighth vibration reduction functional part by the first auxiliary straight line L1, the second auxiliary straight line L2, the third auxiliary straight line L3 and the fourth auxiliary straight line L4.

[0023] In the second step, the thickness of the three sides of the groove cross-section beam of the inner ring vibration damping ring and the outer ring vibration damping ring are equal and are all the same as the bulkhead main body panel thickness t 100 The radial width of the inner edge of the inner ring vibration damping ring and the outer ring vibration damping ring is 2t 100 The height of the inner and outer vibration damping rings are equal to the thickness of the bulkhead panel t 100 same.

[0024] In the second step, the outer radius R of the outer ring vibration damping ring on the bulkhead main panel plane is out_600 The calculation formula is R out_600 =R 100 -3t 100 ;

[0025] Inner radius R of the outer vibration damping ring on the bulkhead main panel plane in_600 The calculation formula is R in_600 =R out_600 -3t 100 ;

[0026] In the second step, the inner radius R of the inner vibration damping ring on the bulkhead main panel plane is in_500 The calculation formula is

[0027]

[0028] in,

[0029] Among them, P m Rated operating speed of the equipment installed on the bulkhead; t 100 is the bulkhead panel thickness; l 101 E is the diagonal length of the rectangular section where the equipment is installed; 100 is the elastic modulus of the bulkhead panel; ρ 100 is the density of the bulkhead main panel; 100 is the Poisson's ratio of the bulkhead body panel;

[0030] The outer radius R of the inner vibration damping ring on the bulkhead main panel plane out_500 The calculation formula is R out_500 =R in_500 +3t 100 .

[0031] In the third step, the diameter of each cylindrical sleeve of the chain vibration isolation ring is 2t 100 The height of each cylindrical sleeve of the chain type vibration isolation ring is 1.5t 100 .

[0032] In the fourth step, the thickness of the composite damping material laid adjacent to the core equipment is equal to the thickness of the bulkhead main panel t 100 same;

[0033] The thickness of the composite damping material laid on the first and eighth vibration damping function parts is 0.8t 100 The thickness of the composite damping material laid on the second and seventh vibration damping function parts is 0.6t 100 The thickness of the composite damping material laid on the third and sixth vibration damping function parts is 0.4t 100 The thickness of the composite damping material laid on the fourth and fifth vibration damping function parts is 0.2t 100 .

[0034] The beneficial effects of the present invention are as follows:

[0035] The present invention has a compact and reasonable structure and is easy to operate. Through the reasonable arrangement of the vibration transmission path, it is lightweight and has an improved noise reduction effect. The double-circle design of the discontinuous rotating groove and the vibration isolation ring can better block the vibration waves into the bulkhead body extending from the center of the equipment installation area. The regional variable thickness laying of the composite damping material can make more full use of the limited weight of the material to dissipate the propagation of the vibration wave. The chain-type vibration isolation ring can further suppress the vibration energy propagating to the edge of the bulkhead.

[0036] At the same time, the present invention also has the following advantages:

[0037] (1) The first vibration reduction function part, the second vibration reduction function part, the third vibration reduction function part, the fourth vibration reduction function part, the fifth vibration reduction function part, the sixth vibration reduction function part, the seventh vibration reduction function part and the eighth vibration reduction function part are respectively laid to match the thickness of the bulkhead main panel and to the center of the equipment installation part. 101 Distance-related variable thickness composite damping materials, regional variable thickness laying of composite damping materials can make fuller use of the limited weight of materials to dissipate the propagation of vibration waves.

[0038] (2) The inner ring rotation groove cooperates with the inner ring vibration damping ring, and the outer ring rotation groove cooperates with the outer ring vibration damping ring, which can better block the vibration waves generated by the operation of the equipment in the equipment installation part into the bulkhead body extending from the center of the equipment installation part. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 A three-dimensional schematic diagram of the present invention Figure 1 .

[0040] Figure 2 A three-dimensional schematic diagram of the present invention Figure 2 .

[0041] Figure 3 for Figure 2 Schematic diagram of the AA section.

[0042] Figure 4 It is a top view of the present invention.

[0043] Among them: 100, bulkhead main panel; 101, equipment installation part; 102, core adjacent equipment part; 103, intermediate transition part; 104, peripheral vehicle connection part; 200, inner ring rotation groove; 300, outer ring rotation groove; 400, reinforcement rib; 500, inner ring vibration isolation ring; 600, outer ring vibration isolation ring; 700, set chain vibration isolation ring; 800, inner ring integral rotation groove; 900, outer ring integral rotation groove;

[0044] 1031, first vibration reduction function unit; 1032, second vibration reduction function unit; 1033, third vibration reduction function unit; 1034, fourth vibration reduction function unit; 1035, fifth vibration reduction function unit; 1036, sixth vibration reduction function unit; 1037, seventh vibration reduction function unit; 1038, eighth vibration reduction function unit;

[0045] O 100 , the center of the bulkhead main panel; O 101 , the center of the equipment installation department;

[0046] L1, first auxiliary straight line; L2, second auxiliary straight line; L3, third auxiliary straight line; L4, fourth auxiliary straight line. DETAILED DESCRIPTION

[0047] The specific embodiments of the present invention will be described below with reference to the accompanying drawings.

[0048] A vibration-isolating bulkhead structure for underwater vehicles includes a bulkhead main panel 100. The bulkhead main panel 100 includes an equipment installation portion 101, a core adjacent equipment portion 102, an intermediate transition portion 103, and an outer vehicle connection portion 104 arranged from the inside to the outside.

[0049] A reinforcement rib 400 is arranged on one side of the bulkhead main panel 100 to enhance the strength and stability of the bulkhead structure. The reinforcement rib 400 is located away from the inner vibration damping ring 500.

[0050] In one embodiment, the cross section of the reinforcing rib 400 is T-shaped.

[0051] The reinforcing ribs 400 are cross-welded, that is, the reinforcing ribs 400 are arranged in a vertical and horizontal cross-arrangement.

[0052] An inner ring rotation groove 200 is provided between the core adjacent device portion 102 and the intermediate transition portion 103 , and the cross section of the inner ring rotation groove 200 is rectangular.

[0053] An outer ring rotation groove 300 is provided between the middle transition portion 103 and the outer vehicle connection portion 104 , and the cross section of the outer ring rotation groove 300 is rectangular.

[0054] The center of the device installation part 101 is O 101 The center of the bulkhead main panel 100 is O 100 .

[0055] An inner ring vibration damping ring 500 and an outer ring vibration damping ring 600 are provided on the side of the bulkhead main panel 100 away from the reinforcement rib 400. The bulkhead main panel 100 is fixed to the inner ring vibration damping ring 500 and the outer ring vibration damping ring 600 by welding.

[0056] Inner ring vibration damping ring 500 to O 101 As the center of the circle, the outer ring vibration damping ring is 600 with O100 is the center of the circle.

[0057] The inner ring rotating groove 200 cooperates with the inner ring vibration-damping ring 500, and the outer ring rotating groove 300 cooperates with the outer ring vibration-damping ring 600, which can better block the vibration waves generated by the operation of the equipment in the equipment installation part 101 into the bulkhead body extending from the center of the equipment installation part 101.

[0058] The inner ring vibration damping ring 500 has an inner groove near the inner ring rotation groove 200. The outer ring vibration damping ring 600 also has an inner groove near the outer ring rotation groove 300. The inner grooves of the inner ring vibration damping ring 500 align with the edges of the inner ring rotation groove 200, while the inner grooves of the outer ring vibration damping ring 600 align with the edges of the outer ring rotation groove 300.

[0059] The inner groove of the inner ring vibration damping ring 500 and the inner ring rotation groove 200 form an inner ring integral rotation groove 800 , and the inner groove of the outer ring vibration damping ring 600 and the outer ring rotation groove 300 form an outer ring integral rotation groove 900 .

[0060] The chain-type vibration isolation ring 700 is bonded and fixed in both the inner ring integral rotation groove 800 and the outer ring integral rotation groove 900. The chain-type vibration isolation ring 700 can further block the bending vibration wave and suppress the vibration energy propagating to the edge of the bulkhead.

[0061] The bulkhead body panel 100 is provided with a central portion O passing through the equipment mounting portion 101. 101 The first auxiliary straight line L1, the second auxiliary straight line L2, the third auxiliary straight line L3, and the fourth auxiliary straight line L4.

[0062] The intermediate transition portion 103 is divided into a first vibration damping function portion 1031, a second vibration damping function portion 1032, a third vibration damping function portion 1033, a fourth vibration damping function portion 1034, a fifth vibration damping function portion 1035, a sixth vibration damping function portion 1036, a seventh vibration damping function portion 1037 and an eighth vibration damping function portion 1038 by the first auxiliary straight line L1, the second auxiliary straight line L2, the third auxiliary straight line L3 and the fourth auxiliary straight line L4.

[0063] Composite damping material is applied on the surface of the core adjacent device portion 102 and the intermediate transition portion 103 away from the inner ring rotating groove 200 and the outer ring rotating groove 300 .

[0064] The first vibration reduction function portion 1031, the second vibration reduction function portion 1032, the third vibration reduction function portion 1033, the fourth vibration reduction function portion 1034, the fifth vibration reduction function portion 1035, the sixth vibration reduction function portion 1036, the seventh vibration reduction function portion 1037 and the eighth vibration reduction function portion 1038 are respectively laid to match the thickness of the bulkhead main panel 100 and to the center of the equipment installation portion 101. 101Distance-related variable thickness composite damping materials, regional variable thickness laying of composite damping materials can make fuller use of the limited weight of materials to dissipate the propagation of vibration waves.

[0065] A method for designing a vibration-isolating bulkhead structure for an underwater vehicle comprises the following steps:

[0066] Step 1: The bulkhead main panel 100 includes an equipment installation portion 101, a core adjacent equipment portion 102, an intermediate transition portion 103, and an outer vehicle connection portion 104, arranged from the inside out. An inner ring vibration damping ring 500 is provided between the core adjacent equipment portion 102 and the intermediate transition portion 103; an outer ring vibration damping ring 600 is provided between the intermediate transition portion 103 and the outer vehicle connection portion 104. The equipment installation portion 101 is defined by a rectangle formed by the maximum length and maximum width of the projection of the equipment installed on the bulkhead on the bulkhead main panel 100, with the center of the rectangle being the center of the equipment installation portion 101. 101 ;

[0067] Step 2: The bulkhead main panel 100 is provided with an inner ring rotation groove 200 on the side away from the inner ring vibration-damping ring 500, and the bulkhead main panel 100 is provided with an outer ring rotation groove 300 on the side away from the outer ring vibration-damping ring 600; the inner ring vibration-damping ring 500 is provided with an inner groove on the side close to the inner ring rotation groove 200, and the outer ring vibration-damping ring 600 is also provided with an inner groove on the side close to the outer ring rotation groove 300; the inner grooves of the inner ring vibration-damping ring 500 are aligned with the edges of the inner ring rotation groove 200, and the inner grooves of the outer ring vibration-damping ring 600 are aligned with the edges of the outer ring rotation groove 300; the inner grooves of the inner ring vibration-damping ring 500 and the inner ring rotation groove 200 form an inner ring integral rotation groove 800, and the inner grooves of the outer ring vibration-damping ring 600 and the outer ring rotation groove 300 form an outer ring integral rotation groove 900;

[0068] The thickness of the three sides of the groove cross-section beam of the inner ring vibration damping ring 500 and the outer ring vibration damping ring 600 are equal and are all the same as the thickness of the bulkhead main panel 100. 100 The radial width of the inner edge of the inner ring 500 and the outer ring 600 is 2t 100 The height of the inner vibration damping ring 500 and the outer vibration damping ring 600 are both equal to the thickness t of the bulkhead main panel 100. 100 same;

[0069] The outer radius R of the outer ring vibration damping ring 600 on the plane of the bulkhead main panel 100 is out_600 The overall radius R of the bulkhead body panel 100 is 100 and thickness t 100 The calculation formula is R out_600 =R 100 -3t 100 ;

[0070] The inner radius R of the outer ring vibration damping ring 600 on the plane of the bulkhead main panel 100 is in_600 , the calculation formula is R in_600 =R out_600 -3t 100 ;

[0071] The inner radius R of the inner vibration damping ring 500 on the plane of the bulkhead main panel 100 is in_500 , the rated operating speed P of the equipment installed on the bulkhead m 、Bulkhead main panel 100 thickness t 100 , the diagonal length l of the rectangular device installation part 101 101 , the inner radius R of the outer ring vibration damping ring 600 in_600 Determine, based on the elastic modulus E of the bulkhead body panel 100 100 , density ρ 100 Poisson's ratio 100 Calculate intermediate variables;

[0072]

[0073] The inner radius R of the inner ring vibration damping ring 500 in_500 The calculation formula is

[0074]

[0075] The outer radius R of the inner vibration damping ring 500 on the plane of the bulkhead main panel 100 is out_500 , and its calculation formula is

[0076] R out_500 =R in_500 +3t 100 .

[0077] Step 3: A chain-type vibration isolation ring 700 is fixed in the inner ring integral rotation groove 800 and the outer ring integral rotation groove 900; the chain-type vibration isolation ring 700 is a chain structure composed of cylindrical sleeves of phononic crystal material cross-stacked, and the whole is in a circular state; the diameter of each cylindrical sleeve of the chain-type vibration isolation ring 700 is 2t 100 The height of each cylindrical sleeve of the chain type vibration isolation ring 700 is 1.5t 100 ;

[0078] Step 4: Draw a line O through the center of the bulkhead body panel 100 100 and the center O of the device installation part 101 101 The first auxiliary straight line L1; the first auxiliary straight line L1 is the center of the device installation portion 101 O 101The second auxiliary straight line L2, the third auxiliary straight line L3 and the fourth auxiliary straight line L4 are generated by rotating at 45° every time within the plane of the bulkhead main panel 100 as the center; the surface of the intermediate transition portion 103 is divided into a first vibration reduction functional portion 1031, a second vibration reduction functional portion 1032, a third vibration reduction functional portion 1033, a fourth vibration reduction functional portion 1034, a fifth vibration reduction functional portion 1035, a sixth vibration reduction functional portion 1036, a seventh vibration reduction functional portion 1037 and an eighth vibration reduction functional portion 1038 by the first auxiliary straight line L1, the second auxiliary straight line L2, the third auxiliary straight line L3 and the fourth auxiliary straight line L4.

[0079] The thickness of the composite damping material laid on the core adjacent equipment part 102 is equal to the thickness t of the bulkhead main panel 100. 100 same.

[0080] The thickness of the composite damping material applied to the first vibration reduction function part 1031 and the eighth vibration reduction function part 1038 is 0.8t 100 The thickness of the composite damping material laid on the second vibration damping function portion 1032 and the seventh vibration damping function portion 1037 is 0.6t 100 The thickness of the composite damping material laid on the third vibration damping function portion 1033 and the sixth vibration damping function portion 1036 is 0.4t 100 The thickness of the composite damping material laid on the fourth vibration damping function portion 1034 and the fifth vibration damping function portion 1035 is 0.2t 100 .

[0081] In the third step, the phononic crystal material of the chain-type vibration isolation ring 700 has high damping characteristics and can be formed through technologies such as 3D printing; the inner ring and outer ring of the chain-type vibration isolation ring 700 are respectively embedded in the inner ring integral rotation groove 800 and the outer ring integral rotation groove 900, and are fixed with strong glue.

[0082] The composite damping material is rubber damping with hollow microspheres.

[0083] The above description is an explanation of the present invention, not a limitation of the present invention. The scope of the present invention is defined in the claims. Any modifications may be made within the scope of protection of the present invention.

Claims

1. A vibration-isolating bulkhead structure for an underwater vehicle, characterized in that: include: The bulkhead main body panel (100) includes an equipment installation portion (101), a core adjacent equipment portion (102), an intermediate transition portion (103), and an outer aircraft connection portion (104) arranged from the inside to the outside; An inner vibration damping ring (500) is arranged between the core adjacent device portion (102) and the intermediate transition portion (103); An outer vibration damping ring (600) is arranged between the intermediate transition portion (103) and the outer vehicle connection portion (104); The inner ring vibration-blocking ring (500) and the outer ring vibration-blocking ring (600) are located on one side of the bulkhead main panel (100); an inner ring rotation groove (200) and an outer ring rotation groove (300) are provided on the side of the bulkhead main panel (100) away from the inner ring vibration-blocking ring (500) and the outer ring vibration-blocking ring (600); the inner ring rotation groove (200) is provided between the core adjacent equipment part (102) and the middle transition part (103); and the outer ring rotation groove (300) is provided between the middle transition part (103) and the peripheral aircraft connection part (104); An inner groove is provided on one side of the inner ring vibration-blocking ring (500) close to the inner ring rotation groove (200); an inner groove is also provided on one side of the outer ring vibration-blocking ring (600) close to the outer ring rotation groove (300); the inner groove of the inner ring vibration-blocking ring (500) and the inner ring rotation groove (200) form an inner ring integral rotation groove (800), and the inner groove of the outer ring vibration-blocking ring (600) and the outer ring rotation groove (300) form an outer ring integral rotation groove (900); a set chain-type vibration isolation ring (700) is fixed in the inner ring integral rotation groove (800) and the outer ring integral rotation groove (900); Composite damping material is applied on the surface of the core adjacent device portion (102) and the intermediate transition portion (103) away from the inner ring rotation groove (200) and the outer ring rotation groove (300).

2. The underwater vehicle vibration reduction and isolation bulkhead structure according to claim 1, characterized in that: The center of the equipment installation part (101) is O 101 The center of the bulkhead main panel (100) is O 100 ; Inner ring vibration damping ring (500) with O 101 As the center of the circle, the outer vibration damping ring (600) is O 100 is the center of the circle.

3. The underwater vehicle vibration reduction and isolation bulkhead structure according to claim 1, characterized in that: The intermediate transition portion (103) includes a first vibration reduction function portion (1031), a second vibration reduction function portion (1032), a third vibration reduction function portion (1033), a fourth vibration reduction function portion (1034), a fifth vibration reduction function portion (1035), a sixth vibration reduction function portion (1036), a seventh vibration reduction function portion (1037) and an eighth vibration reduction function portion (1038).

4. The underwater vehicle vibration reduction and isolation bulkhead structure according to claim 2, characterized in that: A reinforcing rib (400) is provided on the side of the bulkhead main panel (100) away from the inner vibration damping ring (500).

5. A method for designing a vibration isolation bulkhead structure for an underwater vehicle, characterized in that: The steps include: The first step: the bulkhead main panel (100) includes an equipment installation portion (101), a core adjacent equipment portion (102), an intermediate transition portion (103) and an outer aircraft connection portion (104) arranged from the inside to the outside; an inner ring vibration damping ring (500) is arranged between the core adjacent equipment portion (102) and the intermediate transition portion (103); an outer ring vibration damping ring (600) is arranged between the intermediate transition portion (103) and the outer aircraft connection portion (104); the equipment installation portion (101) is determined by a rectangle formed by the maximum length and maximum width of the projection of the equipment installed on the bulkhead on the bulkhead main panel (100), and the center of the rectangle is the center of the equipment installation portion (101). 101 ; Step 2: The bulkhead main panel (100) is provided with an inner ring rotation groove (200) on a side away from the inner ring vibration-blocking ring (500), and the bulkhead main panel (100) is provided with an outer ring rotation groove (300) on a side away from the outer ring vibration-blocking ring (600); an inner groove is provided on a side of the inner ring vibration-blocking ring (500) close to the inner ring rotation groove (200), and an inner groove is also provided on a side of the outer ring vibration-blocking ring (600) close to the outer ring rotation groove (300); the inner grooves of the inner ring vibration-blocking ring (500) are aligned with the edges of the inner ring rotation groove (200), and the inner grooves of the outer ring vibration-blocking ring (600) are aligned with the edges of the outer ring rotation groove (300); the inner grooves of the inner ring vibration-blocking ring (500) and the inner ring rotation groove (200) form an inner ring integral rotation groove (800), and the inner grooves of the outer ring vibration-blocking ring (600) and the outer ring rotation groove (300) form an outer ring integral rotation groove (900); Step 3: A set of chain-type vibration isolation rings (700) are fixed in the inner ring integral rotation groove (800) and the outer ring integral rotation groove (900); the chain-type vibration isolation ring (700) is a chain structure composed of cross-stacked cylindrical sleeves made of phononic crystal material, and the whole is in a circular ring state; Step 4: Draw a line O through the center of the bulkhead body panel (100) 100 and the center O of the device installation part (101) 101 The first auxiliary straight line L1 is the center O of the equipment installation part (101). 101 A second auxiliary straight line L2, a third auxiliary straight line L3, and a fourth auxiliary straight line L4 are generated by rotating at 45° intervals within the plane of the bulkhead main panel (100) as the center; the surface of the intermediate transition portion (103) is divided into a first vibration reduction function portion (1031), a second vibration reduction function portion (1032), a third vibration reduction function portion (1033), a fourth vibration reduction function portion (1034), a fifth vibration reduction function portion (1035), a sixth vibration reduction function portion (1036), a seventh vibration reduction function portion (1037), and an eighth vibration reduction function portion (1038) by the first auxiliary straight line L1, the second auxiliary straight line L2, the third auxiliary straight line L3, and the fourth auxiliary straight line L4.

6. The method for designing a vibration-isolating bulkhead structure for an underwater vehicle according to claim 1, wherein: In the second step, the thickness of the three sides of the groove cross-section beam of the inner ring vibration damping ring (500) and the outer ring vibration damping ring (600) are equal and are all the same as the thickness t of the bulkhead main body panel (100). 100 The radial width of the inner edge of the inner ring vibration damping ring (500) and the outer ring vibration damping ring (600) is 2t 100 The heights of the inner vibration damping ring (500) and the outer vibration damping ring (600) are both equal to the thickness t of the bulkhead main panel (100). 100 same.

7. The method for designing a vibration-isolating bulkhead structure for an underwater vehicle according to claim 6, wherein: In the second step, the outer radius R of the outer ring vibration damping ring (600) on the plane of the bulkhead main panel (100) is out_600 The calculation formula is R out_600 =R 100 -3t 100 ; The inner radius R of the outer vibration damping ring (600) on the plane of the bulkhead main panel (100) in_600 The calculation formula is R in_600 =R out_600 -3t 100。 8. The method for designing a vibration-isolating bulkhead structure for an underwater vehicle according to claim 7, wherein: In the second step, the inner radius R of the inner vibration damping ring (500) on the plane of the bulkhead main panel (100) is in_500 The calculation formula is in, Among them, P m Rated operating speed of the equipment installed on the bulkhead; t 100 is the thickness of the bulkhead main panel (100); l 101 E is the diagonal length of the rectangle of the equipment installation part (101); 100 is the elastic modulus of the bulkhead main panel (100); ρ 100 is the density of the bulkhead main panel (100); 100 is the Poisson's ratio of the bulkhead body panel (100); The outer radius R of the inner vibration damping ring (500) on the plane of the bulkhead main panel (100) out_500 The calculation formula is R out_500 =R in_500 +3t 100 .

9. The method for designing a vibration-isolating bulkhead structure for an underwater vehicle according to claim 8, wherein: In the third step, the diameter of each cylindrical sleeve of the chain type vibration isolation ring (700) is 2t 100 The height of each cylindrical sleeve of the chain type vibration isolation ring (700) is 1.5t 100 .

10. A method for designing a vibration-isolating bulkhead structure for an underwater vehicle according to any one of claims 6 to 9, characterized in that: In the fourth step, the thickness of the composite damping material laid on the core adjacent equipment part (102) is equal to the thickness t of the bulkhead main panel (100). 100 same; The thickness of the composite damping material laid on the first vibration reduction function part (1031) and the eighth vibration reduction function part (1038) is 0.8t 100 The thickness of the composite damping material laid on the second vibration reduction function part (1032) and the seventh vibration reduction function part (1037) is 0.6t 100 The thickness of the composite damping material laid on the third vibration reduction function part (1033) and the sixth vibration reduction function part (1036) is 0.4t 100 The thickness of the composite damping material laid on the fourth vibration reduction function part (1034) and the fifth vibration reduction function part (1035) is 0.2t 100 .

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