A clamp type vibration isolation device for an underwater vehicle stern propulsion motor

Abstract

The application discloses a clamp type vibration isolation device of a stern propulsion motor of an underwater vehicle and belongs to the technical field of metamaterial vibration reduction and noise reduction. The vibration isolation device comprises a clamp ring and a vibration isolator, the clamp ring comprises an upper clamp ring and a lower clamp ring, and the vibration isolator is made of metamaterial with a periodic structure; the upper clamp ring and the lower clamp ring are fixedly connected together through bolts, the vibration isolator is fixedly connected at the fixed connection position of the upper clamp ring and the lower clamp ring, and parallel intervals are left between the upper clamp ring and the lower clamp ring. The vibration isolation device has excellent vibration isolation effect, requires small installation space, has a long service life, and has controllable vibration isolation frequency bands and easy assembly, and the structure thereof can be popularized and used in various cylindrical stern motors and maturely manufactured underwater vehicle stern vibration isolation devices, so that the control on vibration sound radiation of the underwater vehicle is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of metamaterial vibration and noise reduction, and particularly relates to a clamp type vibration isolation device of a stern propulsion motor of an underwater vehicle. BACKGROUND

[0002] Since the early 1950s, foreign scholars have carried out researches on stern structure vibration of underwater vehicles, but because the power of the ship power equipment at that time was small, the stern structure vibration and sound radiation problem was not prominent, and no high vibration isolation requirement was made on the stern structure. With the large-scale and high-power of the underwater vehicle structure, the stern structure vibration and sound radiation problem gradually becomes prominent, and the stern vibration isolation of the underwater vehicle becomes an important problem. In the 21st century, as the era of the ocean, the demand for sea hydrological survey and territorial control of countries is growing, and the underwater vehicle as an important ocean structure in the ocean has received more and more attention and economic investment. With the enrichment of the functions of the underwater vehicle, the performance requirements for the structure are more stringent, especially the quietness requirement of some underwater vehicles represented by submarines makes the vibration sound radiation level need to be effectively controlled. The stern of the underwater vehicle generally has wings, rudders, propellers and other structures, so the vibration sound radiation here is more intense. Therefore, the stern of the underwater vehicle becomes the key and focus of the underwater vehicle vibration sound radiation control, and the vibration sound radiation level of this region seriously affects the vibration sound radiation level of the overall structure of the underwater vehicle. However, the current technology in this field cannot effectively achieve the required vibration isolation effect.

[0003] At present, the vibration isolation measures for the stern propulsion motor of the underwater vehicle mainly include adding periodic rib plates and ribbed plates at the stern motor of the underwater vehicle, using a whole isolation cabin to wrap the stern, and adopting a clamp type double-layer vibration isolator.

[0004] The use of periodic rib plates and ribbed plates has poor vibration isolation effect and can make the vibration sound radiation of the stern of the underwater vehicle more complex.

[0005] The full-wrapping type vibration isolation cabin can reduce vibration transmission, but requires a large space and cannot be universally installed and used on various stern motors. The stern of the underwater vehicle has a small space, complex vibration sound radiation, and other problems, so many vibration isolation devices cannot meet the requirements.

[0006] The clamp type double-layer vibration isolator requires more space, and the use of traditional rubber vibration isolation materials has poor corrosion resistance and vibration isolation effect, and a short service life. SUMMARY

[0007] Therefore, the application provides a clamp type vibration isolation device for a stern propulsion motor of an underwater vehicle, which has excellent vibration isolation effect, requires small installation space, has long service life, controllable vibration isolation frequency band and easy assembly, and can be widely used in various cylindrical stern motors and mature underwater vehicle stern vibration isolation devices to improve the control of vibration sound radiation of the underwater vehicle.

[0008] A clamp type vibration isolation device for a stern propulsion motor of an underwater vehicle, the vibration isolation device comprising a clamp ring and a vibration isolator, the clamp ring comprising an upper clamp ring and a lower clamp ring, and the vibration isolator being made of metamaterials with a periodic structure; the upper clamp ring and the lower clamp ring are fixedly connected together by bolts, the vibration isolator is fixedly connected at the fixed connection of the upper clamp ring and the lower clamp ring, and parallel spacing is left between the upper clamp ring and the lower clamp ring.

[0009] Further, the parallel spacing between the upper clamp ring and the lower clamp ring is 1.5 mm.

[0010] Further, the vibration isolator internally connects two vibration isolators, the two vibration isolators are parallel and spaced apart by 5 mm, and the periodic mesh structure inside the vibration isolator is discontinuously continuous.

[0011] Further, the vibration isolator comprises an upper bottom plate, a lower bottom plate, a vibration isolator and an insertion skeleton; the insertion skeleton is inserted into the mesh closest to the end face at the upper and lower ends of the vibration isolator, the upper and lower bottom plates are located at the upper and lower ends of the vibration isolator, and screws pass through the counterbores on the upper and lower bottom plates and the through holes on the end faces of the upper and lower ends of the vibration isolator and are connected with the insertion skeleton, so that the upper and lower bottom plates and the vibration isolator are fixedly connected together.

[0012] Further, the vibration isolator is assembled by applying CH213 glue for bonding.

[0013] Beneficial effects:

[0014] 1. The vibration isolation device comprises a clamp ring and a vibration isolator, the clamp ring comprises an upper half ring and a lower half ring, and the vibration isolator is made of metamaterials with a periodic structure; the upper half ring and the lower half ring are fixedly connected together by bolts, the vibration isolator is fixedly connected to the mounting surface of the upper half ring, and parallel spacing of 1.5 mm is left between the upper clamp ring and the lower clamp ring. The clamp ring can be prevented from being severely deformed under certain vibration, and has good safety; the connection in the vibration isolator is kept tight, so that the vibration isolation performance of the metamaterial vibration isolator is fully utilized.

[0015] 2. The vibration isolator internally connects two vibration isolators, the two vibration isolators are parallel and spaced apart by 5 mm, and the periodic mesh structure inside the vibration isolator is discontinuously continuous, which can prevent the entire vibration isolator from being broken when the shape of the vibration isolator is deformed, and improve the safety thereof.

[0016] 3、The clamp ring of the present application is tightly connected with the vibration isolator by screws, so that the vibration energy is well transmitted to the vibration isolator, rather than being released and consumed at the connection, causing the parts to loosen and fall off, while having a good vibration isolation effect while supporting and impact buffering the propulsion motor.

[0017] 4、The vibration isolation body of the present application is a mesh structure, which belongs to a periodic structure material of metamaterials. Its characteristic is to control classical waves in various media through materials or structures, especially to prohibit the propagation of elastic waves in a certain direction and frequency band by introducing band gap engineering, thereby achieving the effect of shock absorption. The vibration isolation body designed in the device can realize adjustable vibration isolation frequency by changing its internal structure and material, and the internal gap design not only improves the material utilization rate and reduces the device quality, but also ensures the safety of the device with a large deformation margin. Compared with traditional vibration isolation rubber and other materials, the use of metamaterial polyurethane (MUC100) is more environmentally friendly. Its vibration isolation performance is also more excellent.

[0018] 5、The clamp type vibration isolation device of the present application can be adapted to any cylindrical propulsion motor body, and through the clamp method, without adding any external structure to the propulsion motor, the vibration isolation device can be installed on the propulsion motor, and the product has strong adaptability. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a three-dimensional view of the clamp type vibration isolation device in the embodiment of the present application;

[0020] Figure 2 is an exploded view of the clamp type vibration isolation device in the embodiment of the present application;

[0021] Figure 3 is a structural schematic view of the vibration isolator in the embodiment of the present application;

[0022] Figure 4 is a structural schematic view of the vibration isolation body in the embodiment of the present application;

[0023] Figure 5 is a structural schematic view of the clamp ring in the embodiment of the present application;

[0024] Figure 6 is a structural schematic view of the clamp type vibration isolation device of the sealed cabin applied to the sealed cabin of the motor of the underwater vehicle in the embodiment of the present application.

[0025] Among them, 1 is a clamp ring, 11 is an upper clamp ring, 12 is a lower clamp ring, 2 is a vibration isolator, 21 is a vibration isolation body, 22 is a lower bottom plate, 23 is an upper bottom plate, 3 is a screw, and 4 is an insertion skeleton. DETAILED DESCRIPTION

[0026] The present application will be described in detail below in conjunction with the drawings and examples.

[0027] This invention provides a clamp-type vibration isolation device for the stern propulsion motor of an underwater vehicle, including a clamp ring 1 and a vibration isolator 2. The clamp ring includes an upper clamp ring 11 and a lower clamp ring 12. When the upper clamp ring 11 and the lower clamp ring 12 are assembled, a parallel gap of 1.5mm is left. The upper and lower clamp rings are connected by bolts (GB / T5782-2000, M20×45), flat washers, and spring washers, ensuring that the clamp ring will not undergo severe deformation under certain vibration, thus providing good safety. This gap can be... Figure 1 Observed from. From Figure 1 3D structure diagram and Figure 2 The exploded view shows that the clamp ring 1 and the vibration isolator 2 are tightly connected by screws, ensuring that vibration energy is effectively transferred to the isolator rather than being released and dissipated at the connection point, preventing parts from loosening and falling off. This provides both support and impact buffering for the propulsion motor while also offering good vibration isolation. From... Figure 1 It can be seen that the installed underwater vehicle motor should be cylindrical, and its axis should coincide with that of the vibration isolation device to ensure the vibration isolation effect.

[0028] Figure 5 These are the front view, top view, and sectional view of the clamp ring. Figure 5 The clamp ring has an inner diameter of 180mm and an outer diameter of 204mm. It is made of titanium alloy TC4, a material known for its high strength, high thermal strength, good corrosion resistance, and mature manufacturing process. Ear-shaped fixing plates are designed at both ends of the diameter division between the upper and lower clamp rings for secure connection. Preferably, the upper clamp ring 11 and the lower clamp ring 12 have a 1.5mm parallel gap to ensure that the clamp ring will not deform drastically under certain vibrations, providing good safety. Simultaneously, its 180mm inner diameter should be precision machined after the upper clamp ring 11 and lower clamp ring 12 are spliced ​​and tightened to ensure that the overall inner diameter accuracy of the ring meets the requirements. The ear-shaped fixing plates and the outer surface of the ring are designed with 6mm stiffeners, making the entire component more stable. The ear-shaped fixing plate is designed with five threaded holes. Four of these holes are distributed at the vertices of a rectangle and are used to connect with the vibration isolator by countersunk hexagonal screws. One threaded hole is located at the center of the ear-shaped fixing plate and is used to connect with the upper and lower clamping rings by bolts (GB / T5782-2000, M20×45). Preferably, the furthest vertical plane of the ear-shaped fixing plate is 162mm from the axis.

[0029] Figure 3The vibration isolator is shown in a top view and a sectional view, and comprises a vibration isolation body 21, a lower bottom plate 22, an upper bottom plate 23, a screw 3 and an inserted skeleton 4, the inserted skeleton 4 is inserted into the mesh closest to the end face at the upper and lower ends of the vibration isolation body 21 respectively, the upper and lower bottom plates 23 are located at the upper and lower ends of the vibration isolation body 21 respectively, the screw 3 is connected with the inserted skeleton 4 after being matched with the counterbores on the upper and lower bottom plates 23 and 22 and the through holes on the end faces of the upper and lower ends of the vibration isolation body 21, so that the upper and lower bottom plates 23 and 22 are fixedly connected with the vibration isolation body 21.

[0030] The vibration isolation body is a structural material of a metamaterial polyurethane (MUC100), has a good vibration isolation effect and can realize vibration isolation of different frequency bands by adjusting the internal structure and the material.

[0031] Figure 4 The vibration isolation body 21 is shown in an isometric view, a front view and a sectional view. The vibration isolation body 21 has a cubic structure, and the length, width and height thereof are 50 mm, 40 mm and 47.5 mm respectively. The hole shape of the internal mesh structure of the vibration isolation body 21 is obtained by a simple deformation of a straight slot. The radius of the circular arc at the two ends of the slot is 2.45 mm, and the length of the slot is 17 mm. The material of the vibration isolation body 21 is polyurethane (MUC100), which has excellent mechanical properties, modulus and damping performance.

[0032] Each vibration isolator is fixedly connected with two metamaterial vibration isolation bodies. Preferably, the two metamaterial vibration isolation bodies are parallel and spaced apart by 5 mm, but the mesh structures thereof are discontinuously continuous, so that the vibration isolation body is prevented from being broken due to deformation when the shape of the whole vibration isolation body is too large. The safety is improved. Preferably, a set of two, a total of two sets of four screws are used to fixedly connect the cover plate and the vibration isolation member, the vibration isolation body and the clamp ring, and CH213 glue (Loder Chemical) is applied for bonding during assembly of the vibration isolation body. The excellent bonding strength and shear bonding strength of the CH213 glue make the stability and safety of the vibration isolation body enhanced. The materials of other components are also titanium alloy (TC4), which has high strength, high thermal strength and good corrosion resistance, and the manufacturing process is mature. Each cover plate is designed with four threaded holes matched with the internal hexagonal countersunk head screws (M6x10) to be connected with the two vibration isolation bodies.

[0033] The vibration isolation principle of the present application is that when the motor vibrates to generate a displacement, the upper clamp ring 11 and the lower clamp ring 12 will generate a displacement and a force. The vibration isolation body 21 at the left and right fixed positions of the clamp ring 1 will store the kinetic energy as potential energy of deformation after deformation. In the reverse displacement, the potential energy is released to offset the energy generated by the new vibration displacement. Most of the vibration energy is consumed in the vibration isolation body 21, so that the effect of vibration reduction and vibration isolation is achieved.

[0034] In addition, the application also discloses a sealing cabin clamp vibration isolation device, which has similar structure and principle with the shaft shell clamp device. The sealing cabin installed on the motor of the underwater vehicle can further enhance the vibration isolation effect of the stern of the underwater vehicle. The three-dimensional structure is shown in Figure 6 The structure, principle and connection assembly are basically the same, and thus will not be described in detail.

[0035] To sum up, the above is only a preferred embodiment of the application, and is not used to limit the protection scope of the application. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the application shall be included in the protection scope of the application.

Claims

1. A clamp-type vibration isolation device for the stern propulsion motor of an underwater vehicle, characterized in that, The vibration isolation device includes a clamping ring and a vibration isolator. The clamping ring includes an upper clamping ring and a lower clamping ring. The vibration isolator is made of a metamaterial with a periodic structure. The upper clamping ring and the lower clamping ring are fixedly connected together by bolts. The vibration isolator is fixedly connected at the fixed connection point of the upper clamping ring and the lower clamping ring. A parallel gap is left between the upper clamping ring and the lower clamping ring. The vibration isolator is fixedly connected to the mounting surface of the upper retaining ring, and a parallel gap of 1.5mm is left between the upper retaining ring and the lower retaining ring; The vibration isolator is internally connected to two vibration isolators, which are parallel and spaced 5mm apart. The periodic mesh structure inside the vibration isolator is discontinuous and continuous.

2. The clamp-type vibration isolation device for the stern propulsion motor of an underwater vehicle as described in claim 1, characterized in that, The vibration isolator includes an upper base plate, a lower base plate, a vibration isolator body, and an insert frame. The insert frame is inserted into the mesh holes closest to the end face at the upper and lower ends of the vibration isolator body. The upper base plate and the lower base plate are located at the upper and lower ends of the vibration isolator body respectively. Screws are connected to the insert frame after passing through the countersunk holes on the upper and lower base plates and the through holes on the end faces of the upper and lower ends of the vibration isolator body, so that the upper base plate and the lower base plate are fixedly connected to the vibration isolator body.

3. The clamp-type vibration isolation device for the stern propulsion motor of an underwater vehicle as described in claim 1 or 2, characterized in that, The vibration isolators are bonded together using CH213 adhesive during assembly.

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