Composite vibration reduction base based on acoustic black hole technology and suitable for large-scale equipment

Abstract

The invention discloses a composite vibration reduction base based on an acoustic black hole technology and suitable for large equipment. Belongs to the technical field of vibration reduction bases of acoustic black holes and particle dampers. The device comprises a base panel, an upper web plate, an upper toggle plate, a rigid vibration resistance connecting plate, a lower web plate, a lower toggle plate and a base bottom plate. Firstly, the rigid vibration-resistant connecting plate is of a three-layer structure, the upper and lower layers are steel plates, and a butyl rubber damping layer is laid between the upper and lower steel plates. A butyl rubber damping layer is also designed between the steel plates of the lower toggle plate; secondly, an acoustic black hole is additionally formed between the two lower toggle plates, and a cuboid particle damper is arranged in the center of the circular acoustic black hole; the particle damper shell is made of an iron box, the box is provided with a tungsten ball, and the size of the tungsten ball is approximately 2 / 3 of that of the iron box. And finally, the metal plate and the damping layer are connected through bolts, and Mn-Cu high-entropy alloy gaskets are arranged at the joints of screws and nuts. The damping base is simple, reasonable and novel in design, transverse damping and longitudinal damping are both considered, and the overall damping effect of the base is enhanced.

Description

Technical Field

[0001] This invention belongs to the technical field of vibration damping bases based on acoustic black holes and particle dampers, and relates to a composite vibration damping base suitable for large equipment based on acoustic black hole technology. Background Technology

[0002] With the rapid development of modern industry and technology, vibration problems generated by large equipment such as generator sets, central air conditioning units, and large compressors during operation are becoming increasingly prominent. These vibrations not only originate from unbalanced forces, impact forces, or hydrodynamics within the equipment, but also from the external environment. For example, during ship voyages, as speed increases, the high-speed operation of power equipment transmits vibrations to the hull, accelerating the wear of components such as bearings and couplings, increasing equipment failure rates. Some precision navigation equipment is sensitive to abnormal vibrations, which may lead to inaccurate readings or even structural fatigue damage. Secondly, the vibration reduction structures currently used in ship engine rooms, where major power equipment such as diesel engines and generators operate simultaneously, cause severe vibrations. The transmission of vibration waves through physical fasteners can cause severe vibrations in the crew quarters. When the rolling frequency is close to the human sensitive frequency range of 0.1-0.3Hz, seasickness symptoms may occur. Long-term vibration can also lead to vestibular dysfunction. Therefore, acoustic black hole technology can improve this situation and enhance comfort on board. Furthermore, the development of large-scale equipment is increasingly trending towards higher speeds and larger sizes, which in turn leads to more intense vibrations and severe noise radiation, reducing its acoustic stealth performance and causing damage to the marine environment. Summary of the Invention

[0003] Purpose of the invention: The purpose of this invention is to provide a composite vibration damping base suitable for large equipment loads, which not only has a reasonable structural design but also high efficiency and convenience. This base is based on acoustic black hole technology and integrates related technologies such as particle dampers, butyl rubber, and Mn-Cu high-entropy alloy gaskets.

[0004] The technical solution of the present invention is: a composite vibration reduction base based on acoustic black hole technology applicable to large equipment, the base comprising, from top to bottom, a base panel, an upper web plate, an upper elbow plate, a rigid vibration damping connecting plate, a lower web plate, a lower elbow plate and a base bottom plate; The base panel, rigid vibration damping connecting plate, lower web plate, and lower elbow plate are connected as one unit by welding. Bolt mounting holes are pre-set in the upper web plate, upper elbow plate, rigid vibration damping connecting plate, and lower web plate. These components are fastened by bolt mounting holes and matching bolt and nut assemblies. High-entropy alloy gaskets (Mn-Cu high-entropy alloy gaskets) are also added at the contact points between the bolt and nut assemblies and each plate.

[0005] Furthermore, several lower elbow plates are symmetrically installed on both sides of the lower web plate. A matching lower elbow plate damping layer is installed on the outer side of the lower elbow plate, and a matching constraint plate is installed on the outer side of the lower elbow plate damping layer. The lower elbow plates, lower elbow plate damping layers, and constraint plates are welded together by four sets of bolt and nut assemblies inserted through four pre-reserved fixing holes. High-entropy alloy gaskets are installed at the contact points between the bolt and nut assembly and the lower elbow plate, the lower elbow plate damping layer, and the constraint plate.

[0006] Furthermore, two matching lower elbow plate steel plates are installed on the top side of the lower elbow plate, and a 60mm thick butyl rubber damping layer is laid in the middle of the two lower elbow plate steel plates.

[0007] Furthermore, acoustic black holes are installed at both ends of the lower web plate and between two adjacent lower elbow plates on the outer side. The acoustic black holes are designed on one side of the lower web plate and located between the two lower elbow plates, with a total of two acoustic black holes installed. A particle damper is welded at the center of the acoustic black hole, a particle damper shell is installed on the outside of the particle damper, and several particle damping balls are placed inside the particle damper; the particle damper is installed by welding, directly welding the particle damper to the center of the acoustic black hole.

[0008] Furthermore, the spherical center of the acoustic black hole is deeply embedded into half of the lower web, and the other half of the lower web is used for load-bearing; the size of the acoustic black hole is approximately the width between the two lower elbow plates. The outer shell of the particle damper is welded to the exact center of the concave surface of the acoustic black hole, and the number of particle damping balls is 2 / 3 of the volume of the outer shell of the particle damper (the tungsten bead particle damping occupies about 2 / 3 of the space of the box).

[0009] Furthermore, the outer shell of the particle damper is made of rectangular stainless steel (rectangular metal box) with dimensions of 160mm*100mm*120mm. The diameter of the granular damping ball is 7 mm.

[0010] Furthermore, the upper elbow plate is installed longitudinally along the length direction of the upper web plate; The upper elbow plate adopts an integrated structure and is directly welded to the base panel, upper web plate, and rigid vibration damping connection plate. The upper elbow plate has a T-shaped side surface containing two right angles, and the rigid damping connecting plate, lower web plate and base are in the shape of an I-beam.

[0011] Furthermore, the base panel, upper web plate, and rigid vibration damping connecting plate are perpendicular to each other, and their sides present an I-shaped structure. The base panel, the rigid vibration damping connecting plate, and the base floor are arranged in parallel. The lower elbow plate, lower web plate, and base plate are all perpendicular to each other, and all three are connected by welding.

[0012] Furthermore, the rigid vibration damping connection plate adopts a three-layer structure, with the upper and lower layers being steel plates and a butyl rubber damping layer laid between the upper and lower steel plates, the thickness of which is 60mm.

[0013] Furthermore, the dimensions of the base panel are 5500mm*1700mm*200mm. The dimensions of the upper web are 5500mm*500mm*600mm. The rigid vibration damping connection plate measures 5500mm*1000mm*250mm. The dimensions of the lower web are 5500mm*500mm*1750mm. The dimensions of the base plate are 5500mm*4000mm*250mm.

[0014] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: First, the structural design of the present invention can control the propagation of bending waves in the lower web structure and reduce the transmission of structural sound; second, the vibration of the particle damper can enhance the overall vibration reduction performance of the base. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a perspective view of the present invention; Figure 3 This is a side view of the present invention; Figure 4 This is a top view of the present invention; Figure 5 This is a schematic diagram of the particle damper in this invention; In the diagram, 1 is the particle damping ball, 2 is the particle damper shell, 3 is the base panel, 4 is the upper web plate, 5 is the upper elbow plate, 6 is the rigid vibration damping connection plate, 7 is the lower elbow plate damping layer, 8 is the lower web plate, 9 is the constraint plate, 10 is the lower elbow plate steel plate, 11 is the bolt and nut assembly, 12 is the high entropy alloy gasket, and 13 is the base plate. Detailed Implementation

[0016] The specific technical solution of the present invention will be further described in detail below with reference to specific examples.

[0017] As shown in the figure, the composite vibration damping base based on acoustic black hole technology for large equipment described in this invention mainly comprises, from top to bottom, a particle damping ball 1, a particle damper shell 2, a base panel 3, an upper web plate 4, an upper elbow plate 5, a rigid vibration damping connection plate 6, a lower elbow plate, a lower elbow plate damping layer 7, a lower web plate 8, a constraint plate 9, a lower elbow plate steel plate 10, a bolt and nut assembly 11, a high-entropy alloy gasket 12, and a base plate 13.

[0018] The base panel 3, the rigid vibration damping connecting plate 6, the lower web plate 8 and the lower elbow plate are connected as one piece by welding. Bolt mounting holes are pre-set on the rigid vibration damping connection plate 6, upper web plate 4, upper elbow plate 5, lower web plate 8, lower elbow plate, butyl rubber damping layer, and constraint plate. These components are fastened by bolt mounting holes and matching bolt and nut assembly 11. High entropy alloy gaskets 12 (Mn-Cu high entropy alloy gaskets) are also added at the contact positions between the hexagonal head bolts (GB5-76, 100mm in diameter, 500mm in length) and each plate.

[0019] In the embodiment of the composite vibration damping base of the present invention, two integral upper elbow plates 5 are symmetrically provided on both sides of the upper web plate 8 along its length direction. At the same time, several lower elbow plates are provided at intervals on both sides of the lower web plate 8 along its length direction.

[0020] In the composite vibration damping base embodiment of the present invention, the base panel 3, upper web plate 4, upper elbow plate 5, upper and lower layers of rigid vibration damping connecting plate 6, lower web plate 8, lower elbow plate and base bottom plate 13 are all made of ultra-high strength steel. The dimensions of the base panel 3 are 5500mm*1700mm*200mm. The dimensions of the upper web plate 4 are 5500mm*500mm*600mm. The rigid vibration damping connection plate 6 has dimensions of 5500mm*1000mm*250mm. The dimensions of the lower web plate 8 are 5500mm*500mm*1750mm. The dimensions of the base plate 13 are 5500mm*4000mm*250mm; A 60mm thick butyl rubber damping layer is laid in the middle layer of the rigid vibration damping connection plate 6. A 60mm thick butyl rubber damping layer is also laid in the middle layer between the two lower elbow plate steel plates 10.

[0021] According to the design dimensions, the lower web plate 8, base panel 3, base bottom plate 13, rigid vibration damping connecting plate 6, and upper web plate 4 of the base are in the shape of an I-beam. The I-beam cross section concentrates the material on the upper and lower flanges away from the neutral axis, which significantly improves the moment of inertia of the cross section.

[0022] In the embodiment of the composite vibration damping base of the present invention, the acoustic black hole is disposed on one side of the lower web plate 8 and located between the two lower elbow plates; the base is designed with two acoustic black holes, which are generated on the surface of the lower web plate 8 according to a power law function, where is the coefficient, is the coefficient of, and m takes the value of 2.

[0023] The depth of its spherical center is half the thickness of the lower web plate 8, and the other half of the lower web plate 8 is used to bear the weight; the radius of the acoustic black hole is close to the width between the two lower elbow plates, with a radius of 320mm; the geometry of the acoustic black hole is a spherical concave surface, with the characteristics of being thin in the middle and thick around the edges, and its depth is 250mm, which is half the thickness of the lower web plate 8.

[0024] In an embodiment of the composite vibration damping base of the present invention, a particle damper equipped with particle damping is installed at the lowest point of the black hole spherical concave surface. Its outer shell (particle damper shell 2) is welded to the exact center of the acoustic black hole concave surface. The number of particle damping spheres 1 inside is approximately 2 / 3 of the volume of the particle damper shell 2. The particle damper shell 2 is made of rectangular stainless steel with dimensions of 160mm*100mm*120mm. The diameter of the particle damping spheres 1 is 7mm.

[0025] The upper elbow plate 5 is installed longitudinally along the length of the upper web plate 4; the upper elbow plate 5 adopts an integral structure and is directly welded to the base panel 3, the upper web plate 4, and the rigid vibration damping connecting plate 6. The side of the upper elbow plate 5 is a T-shaped surface containing two right angles; the sides of the base plate 3, the upper web plate 4, and the rigid vibration damping connection plate 6 are I-shaped.

[0026] The lower elbow plate is installed on both sides of the lower web plate 8 and is symmetrically arranged; the lower elbow plate, the base plate 13 and the lower web plate 8 are perpendicular to each other. The lower elbow plate and the lower web plate 8 are directly connected by welding. The lower elbow plate and the base plate 13 are directly connected by welding. The base panel 3, the upper web plate 4, and the rigid vibration damping connecting plate 6 are perpendicular to each other. The base panel 3, the rigid vibration damping connecting plate 6, and the base floor 13 are arranged in parallel from top to bottom. The sides of the base panel 3, upper web 4, and rigid vibration damping connection plate 6 are in the shape of an I-beam. The rigid damping connecting plate 6, the lower web plate 8, and the base 13 of the base are in the shape of an I-beam, and the use of I-beams has a good load-bearing capacity.

Claims

1. A composite vibration damping base based on acoustic black hole technology suitable for large equipment, characterized in that, The base consists of a base panel (3), an upper web plate (4), an upper elbow plate (5), a rigid vibration damping connection plate (6), a lower web plate (8), and a base bottom plate (13) from top to bottom. The upper web plate (4), upper elbow plate (5), rigid vibration damping connecting plate (6) and lower web plate (8) are welded together by bolt and nut assemblies (11) inserted through the reserved bolt mounting holes. High entropy alloy gaskets (12) are installed at the contact positions of the bolt and nut assemblies (11) with the upper web plate (4), upper elbow plate (5), rigid vibration damping connecting plate (6) and lower web plate (8).

2. The composite vibration damping base based on acoustic black hole technology suitable for large equipment according to claim 1, characterized in that, Several lower elbow plates are symmetrically installed on both sides of the lower web plate (8). A matching lower elbow plate damping layer (7) is installed on the outside of the lower elbow plate, and a matching constraint plate (9) is installed on the outside of the lower elbow plate damping layer (7). The lower elbow plate, the lower elbow plate damping layer (7) and the constraint plate (9) are welded together by four sets of bolt and nut assemblies (11) inserted through four reserved fixed holes. High-entropy alloy gaskets (12) are installed at the contact points between the bolt and nut assembly (11) and the lower elbow plate, the lower elbow plate damping layer (7) and the constraint plate (9).

3. The composite vibration damping base based on acoustic black hole technology suitable for large equipment according to claim 2, characterized in that, Two matching lower elbow plate steel plates (10) are installed on the top side of the lower elbow plate, and a 60mm thick butyl rubber damping layer is laid in the middle of the two lower elbow plate steel plates (10).

4. The composite vibration damping base based on acoustic black hole technology suitable for large equipment according to claim 1, characterized in that, Acoustic black holes are installed at both ends of the lower web (8) and between the two adjacent lower elbow plates on the outer side. A particle damper is welded at the center of the acoustic black hole, a particle damper shell (2) is installed on the outside of the particle damper, and a number of particle damping balls (1) are placed inside the particle damper.

5. The composite vibration damping base based on acoustic black hole technology suitable for large equipment according to claim 4, characterized in that, The spherical center of the acoustic black hole is embedded to half the depth of the lower abdominal plate (8); The particle damper shell (2) is welded to the center of the concave surface of the acoustic black hole, and the number of particle damping balls (1) is 2 / 3 of the volume of the particle damper shell (2).

6. The composite vibration damping base based on acoustic black hole technology suitable for large equipment according to claim 4, characterized in that, The outer shell (2) of the particle damper is made of rectangular stainless steel and its dimensions are 160mm*100mm*120mm. The diameter of the particle damping ball (1) is 7 mm.

7. The composite vibration damping base based on acoustic black hole technology suitable for large equipment according to claim 1, characterized in that, The upper elbow plate (5) is installed longitudinally along the length direction of the upper web plate (4); The upper elbow plate (5) is welded to the base panel (3), upper web plate (4), and rigid vibration damping connection plate (6) in an integral structure; The side of the upper elbow plate (5) is a T-shaped surface with two right angles, and the rigid damping connecting plate (6), the lower web plate (8) and the base (13) are in the shape of an I-beam.

8. The composite vibration damping base based on acoustic black hole technology suitable for large equipment according to claim 7, characterized in that, The base panel (3), upper web plate (4), and rigid vibration damping connecting plate (6) are perpendicular to each other, and their sides present an I-shaped structure. The base panel (3), the rigid vibration damping connecting plate (6), and the base floor (13) are arranged in parallel. The lower elbow plate, lower web plate (8) and base plate (13) are perpendicular to each other, and the connection between the three is welded.

9. The composite vibration damping base based on acoustic black hole technology suitable for large equipment according to claim 1, characterized in that, The rigid vibration damping connection plate (6) adopts a three-layer structure, with the upper and lower layers being steel plates and a butyl rubber damping layer laid between the upper and lower steel plates. The thickness of the butyl rubber damping layer is 60mm.

10. The composite vibration damping base based on acoustic black hole technology suitable for large equipment according to claim 1, characterized in that, The dimensions of the base panel (3) are 5500mm*1700mm*200mm. The dimensions of the upper web (4) are 5500mm*500mm*600mm. The rigid vibration damping connection plate (6) has dimensions of 5500mm*1000mm*250mm. The dimensions of the lower web (8) are 5500mm*500mm*1750mm. The dimensions of the base plate (13) are 5500mm*4000mm*250mm.

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