CN113815825A - Efficient damping raft frame based on L-shaped continuation structure - Google Patents
Efficient damping raft frame based on L-shaped continuation structure Download PDFInfo
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- CN113815825A CN113815825A CN202111244565.0A CN202111244565A CN113815825A CN 113815825 A CN113815825 A CN 113815825A CN 202111244565 A CN202111244565 A CN 202111244565A CN 113815825 A CN113815825 A CN 113815825A
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- 238000013016 damping Methods 0.000 title claims description 13
- 230000035939 shock Effects 0.000 claims description 4
- 238000002955 isolation Methods 0.000 abstract description 19
- 230000005540 biological transmission Effects 0.000 abstract description 15
- 230000000694 effects Effects 0.000 abstract description 11
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- 238000005452 bending Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000005457 optimization Methods 0.000 description 3
- 230000002238 attenuated effect Effects 0.000 description 2
- 238000010835 comparative analysis Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63G—OFFENSIVE OR DEFENSIVE ARRANGEMENTS ON VESSELS; MINE-LAYING; MINE-SWEEPING; SUBMARINES; AIRCRAFT CARRIERS
- B63G13/00—Other offensive or defensive arrangements on vessels; Vessels characterised thereby
- B63G13/02—Camouflage
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63G—OFFENSIVE OR DEFENSIVE ARRANGEMENTS ON VESSELS; MINE-LAYING; MINE-SWEEPING; SUBMARINES; AIRCRAFT CARRIERS
- B63G13/00—Other offensive or defensive arrangements on vessels; Vessels characterised thereby
- B63G13/02—Camouflage
- B63G2013/022—Camouflage using means for reducing noise emission into air or water
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Abstract
The invention discloses an efficient vibration reduction raft frame based on an L-shaped continuation structure, which comprises a raft frame panel, a raft frame bottom plate, a raft frame longitudinal rib plate and a raft frame transverse rib plate which are oppositely arranged, wherein the raft frame transverse rib plate and the raft frame longitudinal rib plate are respectively transversely and longitudinally provided with a plurality of units to jointly form a plurality of unit lattice structures, at least one L-shaped continuation structure is arranged inside the raft frame transverse rib plate and/or the raft frame longitudinal rib plate, the L-shaped continuation structure comprises a first connecting plate and a second connecting plate vertical to the first connecting plate, the upper end of the first connecting plate is connected with the raft frame transverse rib plate and/or the raft frame longitudinal rib plate, and the lower end of the second connecting plate is connected with the raft frame transverse rib plate and/or the raft frame longitudinal rib plate. The efficient vibration reduction raft frame based on the L-shaped continuation structure increases the waveform conversion, scattering and reflection of vibration waves in the base, can improve the transmission impedance of the raft frame, and further improves the vibration isolation effect of a vibration isolation system.
Description
Technical Field
The invention relates to the technical field of ship sound stealth, in particular to an efficient damping raft frame based on an L-shaped continuation structure.
Background
The floating raft vibration isolation device has a good vibration isolation effect, can isolate the transmission of the vibration of mechanical equipment on the raft to a hull structure through the base, and has a good effect on reducing underwater radiation noise and improving the vitality of the equipment under an impact environment, so that a large number of floating raft vibration isolation devices are equipped on ships at home and abroad.
The raft frame structure is an important link in the design of the floating raft, and is not only an installation platform of equipment, but also a main channel for supporting vibration transmission attenuation in the direction. Therefore, how to improve the vibration attenuation of the raft frame structure under the condition of ensuring the limit of weight and overall dimension is an effective way for improving the performance of the floating raft vibration isolation device.
Disclosure of Invention
The invention mainly aims to provide an efficient vibration reduction raft frame based on an L-shaped continuation structure, and aims to improve the transmission impedance of the raft frame and further improve the vibration isolation effect of a vibration isolation system.
In order to achieve the purpose, the invention provides an efficient vibration reduction raft frame based on an L-shaped continuation structure, which comprises a raft frame panel, a raft frame bottom plate, a raft frame longitudinal rib plate and a raft frame transverse rib plate, wherein the raft frame longitudinal rib plate and the raft frame transverse rib plate are arranged oppositely, the raft frame transverse rib plate and the raft frame longitudinal rib plate are respectively and longitudinally arranged to form a plurality of unit lattice structures, at least one L-shaped continuation structure is arranged inside the raft frame transverse rib plate and/or the raft frame longitudinal rib plate, the L-shaped continuation structure comprises a first connecting plate and a second connecting plate vertical to the first connecting plate, the upper end of the first connecting plate is connected with the raft frame transverse rib plate and/or the raft frame longitudinal rib plate, and the lower end of the second connecting plate is connected with the raft frame transverse rib plate and/or the raft frame longitudinal rib plate.
Preferably, the thickness of the transverse rib plate of the raft frame is L1, the thickness of the longitudinal rib plate of the raft frame is L2, the thickness of the first connecting plate is L3, the thickness of the second connecting plate is L4, L1/L3>3, L1/L4>3, L2/L3>3 and L2/L4> 3.
Preferably, the first and second connection plates have the same thickness.
Preferably, each raft frame horizontal rib plate and/or raft frame longitudinal rib plate's length direction all is provided with two at least L type continuation type structures.
Preferably, the material of the L-shaped continuation structure is the same as that of the raft frame transverse rib plate and the raft frame longitudinal rib plate.
Preferably, the raft frame cross rib plate is internally provided with a square structure, and the upper end and the lower end of the square structure are respectively connected with the upper end and the lower end of the raft frame cross rib plate.
Preferably, the joints of the transverse rib plates and the longitudinal rib plates of the raft frame are provided with a square structure.
Compared with the traditional plate frame type raft frame, the efficient vibration reduction raft frame based on the L-shaped continuation structure can increase the waveform conversion, scattering and reflection of vibration waves in the base, and can greatly improve the transmission impedance of the floating raft frame, thereby improving the vibration isolation effect of a vibration isolation system. The efficient damping raft frame based on the L-shaped continuation structure also has the advantages of simple structure, reliable work and easiness in implementation.
Drawings
Fig. 1 is a schematic front view of a raft frame structure in the prior art (arrows in the figure indicate vibration wave transmission);
fig. 2 is a schematic side view of a raft frame structure in the prior art;
FIG. 3 is a schematic structural diagram of an L-type continuation structure;
FIG. 4 is a graph of transmission coefficient versus thickness ratio for an L-type continuation structure;
fig. 5 is a schematic view of the structure of the efficient shock absorbing raft frame based on the L-type continuation structure of the present invention;
fig. 6 is a schematic side view of an efficient shock absorbing raft frame based on an L-type continuation structure according to the present invention;
fig. 7 is a comparison of the vibration isolation effect of the raft frame.
In the figure, 1-raft frame panel, 2-raft frame bottom plate, 3-raft frame longitudinal rib plate, 4-raft frame transverse rib plate and 5-L type continuation structure.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It should be noted that in the description of the present invention, the terms "lateral", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Referring to fig. 5 and 6, in the preferred embodiment, an efficient vibration-damping raft frame based on an L-shaped continuation structure includes a raft frame panel 1 and a raft frame bottom plate 2 which are oppositely arranged, and a raft frame longitudinal rib plate 3 and a raft frame transverse rib plate 4 which are located between and fixedly connected to raft frame panel 1 and raft frame bottom plate 2, the raft frame transverse rib plate 4 and raft frame longitudinal rib plate 3 are respectively transversely and longitudinally provided with a plurality of pieces to form a plurality of cell structures together, the raft frame transverse rib plate 4 and/or raft frame longitudinal rib plate 3 are provided with at least one L-shaped continuation structure 5 in the middle (L-shaped continuation structure 5 divides raft frame transverse rib plate 4 and raft frame longitudinal rib plate 3 into upper and lower parts), the L-shaped continuation structure 5 includes a first connecting plate and a second connecting plate perpendicular thereto, the upper end of the first connecting plate is connected to upper half part of raft frame transverse rib plate 4 and/or raft frame longitudinal rib plate 3, the lower end of the second connecting plate is connected with the lower half part of the raft frame transverse rib plate 4 and/or the raft frame longitudinal rib plate 3.
As shown in fig. 3, assuming that a bending wave is incident from the rigid flat plate 1, impedance mismatch occurs at the corner, which causes reflection and transmission phenomena of the incident wave and attenuated near-field wave and waveform conversion, and the total wave field is composed of three parts, i.e., an incident sound field, a reflected sound field and a near-field wave attenuated sound field. The variation curve of the transmission coefficient with the thickness ratio (the thickness ratio is the ratio of the thickness of the flat plate 2 to the thickness of the flat plate 1) can be obtained according to the mechanical principle, as shown in fig. 4. As can be seen from fig. 4, as the thickness ratio increases, the transmission coefficient of the vibration wave increases first and then decreases, and when the thickness ratio is equal to 1, the transmission coefficient of the bending wave is maximum. Therefore, under the condition of meeting the requirement of the structural rigidity of the raft frame, through the optimization design of structural parameters of the raft frame, the scheme that the thickness ratio of the rib plates of the raft frame is larger than that of the first connecting plate or the second connecting plate is selected as much as possible, and the transmission coefficient of the bending waves passing through the raft frame is minimized as much as possible.
In this embodiment, when the thickness of the raft frame cross rib plate 4 is L1, the thickness of the raft frame longitudinal rib plate 3 is L2, the thickness of the first connecting plate is L3, and the thickness of the second connecting plate is L4, they satisfy the following conditions: L1/L3>3, L1/L4>3, L2/L3>3 and L2/L4>3, wherein the transmission coefficient of the raft frame is the minimum as possible.
Preferably, the first and second connector plates are of the same thickness to facilitate the production and manufacture of the L-shaped continuation 5.
Furthermore, each raft frame cross rib plate 4 and/or raft frame longitudinal rib plate 3's length direction all is provided with two at least L type continuation type structures 5 to improve the shock attenuation effect. Under the condition of limiting the weight and the overall dimension of the raft frame, the requirements of relevant manufacturing and mounting processes are met, the L-shaped continuation structures 5 are distributed in the raft frame as much as possible and are intensively distributed at the mounting position of the vibration isolator (namely the L-shaped continuation structures 5 are close to a raft frame bottom plate 2 as much as possible), and the bending vibration mode nodes of the raft frame are close to the mounting position of the vibration isolator as much as possible. Compared with the traditional plate frame type raft frame, the L-shaped continuation structure 5 can greatly improve the transmission impedance of the raft frame and improve the vibration isolation effect of a vibration isolation system.
Furthermore, the material of the L-shaped continuation structure 5 is the same as the material of the raft frame transverse rib plate 4 and the raft frame longitudinal rib plate 3.
In this embodiment, a square-shaped structure (i.e., including a plurality of L-shaped continuation structures 5, it can be seen that the left and right ends are formed by connecting two L-shaped continuation structures 5) is accommodated in raft frame transverse rib plate 4, and the upper and lower ends of the square-shaped structure are connected with the upper and lower ends of raft frame transverse rib plate 4. Of course, in other modified embodiments, the shape of the raft frame may be pentagonal or other polygonal shapes, as long as the raft frame has an L-shaped continuation structure 5, and the two ends of the L-shaped continuation structure 5 are connected to the raft frame transverse rib plate 4 or the raft frame longitudinal rib plate 3.
The joint of each raft frame transverse rib plate 4 and the raft frame longitudinal rib plate 3 is provided with a rectangular structure, so that the raft frame transverse rib plates 4 and the raft frame longitudinal rib plates 3 share the rectangular structure, and the manufacturing of the whole efficient vibration reduction raft frame is facilitated.
Referring to fig. 7, a comparative analysis of vibration isolation effect was carried out for the conventional grillage raft and the raft based on L-type continuation structure 5. Taking a certain raft frame as an example, the size of the raft frame is 1620mm × 1000mm × 130mm, the thickness of a raft frame panel 1 is 25mm, the thicknesses of a raft frame transverse rib plate 4 and a raft frame longitudinal rib plate 3 are both 15mm, the size of an L-shaped extension type structure 5 is 50mm × 50mm × 5mm, under the condition that the weight and the overall size of the raft frame are hardly changed, only the structure optimization design is carried out, and the full-frequency-band (10 Hz-3000 Hz) vibration isolation effect of the vibration isolation device is obviously improved, as shown in fig. 7.
The specific design process of the efficient damping raft frame is as follows.
(1) Determining a preliminary scheme of the raft frame according to parameters such as the shape, the size, the weight and the like of the equipment;
(2) according to the weight size and space requirements of the raft frame, determining the sizes and preliminary arrangement schemes of a raft frame panel 1, a raft frame bottom plate 2, a raft frame longitudinal rib plate 3, a raft frame transverse rib plate 4 and the like;
(3) under the condition of not increasing weight and size, carrying out optimization design of raft frame structural parameters, and selecting a scheme that the thickness ratio of a raft frame longitudinal rib plate 3 and a raft frame transverse rib plate 4 to an L continuation type structure is large as much as possible;
(4) optimizing the number and arrangement mode of the L continuation structure cells, intensively distributing the mass of the L continuation structure cells at the mounting position of the vibration isolator, and enabling the front two-step bending vibration mode nodes of the raft frame to be close to the mounting position of the vibration isolator as much as possible;
(5) after the design is finished, the performances of the vibration isolation system such as swinging, impact and the like are checked according to the design requirements and relevant marine specifications, and if the performances are not met, the steps are repeated until the relevant requirements are met.
Compared with the traditional plate frame type raft frame, the efficient vibration reduction raft frame based on the L-shaped continuation structure can increase the waveform conversion, scattering and reflection of vibration waves in the base, and can greatly improve the transmission impedance of the floating raft frame, thereby improving the vibration isolation effect of a vibration isolation system. The efficient damping raft frame based on the L-shaped continuation structure also has the advantages of simple structure, reliable work and easiness in implementation.
The above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the present specification and the drawings, or any other related technical fields, are intended to be covered by the scope of the present invention.
Claims (7)
1. The utility model provides a high-efficient damping raft frame based on L type continuation structure, a serial communication port, including raft frame panel and the raft frame bottom plate that sets up relatively, and be located raft frame longitudinal rib board and raft frame horizontal rib board between raft frame panel and the raft frame bottom plate, raft frame horizontal rib board and raft frame longitudinal rib board transversely and vertically set up many respectively in order to form a plurality of unit lattice structures jointly, raft frame horizontal rib board and/or the inside of raft frame longitudinal rib board are provided with at least one L type continuation structure, L type continuation structure includes first connecting plate and rather than perpendicular second connecting plate, the upper end of first connecting plate is connected with raft frame horizontal rib board and/or raft frame longitudinal rib board, the lower extreme of second connecting plate is connected with raft frame horizontal rib board and/or raft frame longitudinal rib board.
2. An efficient vibration-damping raft frame based on L-type continuation structures as claimed in claim 1, wherein the thickness of the transverse ribs of said raft frame is L1, the thickness of the longitudinal ribs of said raft frame is L2, the thickness of the first connecting plate is L3, the thickness of the second connecting plate is L4, L1/L3>3, L1/L4>3, L2/L3>3, L2/L4> 3.
3. The L-shaped continuation based highly efficient shock absorbing raft frame of claim 1, wherein said first and second connection plates are the same thickness.
4. An efficient damping raft frame based on L-shaped continuation structures according to claim 1, wherein each raft frame transverse rib plate and/or raft frame longitudinal rib plate is provided with at least two L-shaped continuation structures in the length direction.
5. The efficient damping raft frame based on the L-shaped continuation structure according to claim 1, wherein the L-shaped continuation structure is made of the same material as transverse rib plates and longitudinal rib plates of the raft frame.
6. An efficient vibration-damping raft frame based on L-shaped continuation structures as claimed in any one of claims 1 to 5, wherein a square-shaped structure is contained in the transverse rib plate of said raft frame, and the upper and lower ends of said square-shaped structure and the upper and lower ends of the transverse rib plate of said raft frame are connected.
7. An efficient vibration-damping raft frame based on L-shaped extension structures as claimed in claim 6, wherein each raft frame transverse rib plate is provided with a rectangular structure at the connection with a raft frame longitudinal rib plate.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111244565.0A CN113815825A (en) | 2021-10-26 | 2021-10-26 | Efficient damping raft frame based on L-shaped continuation structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111244565.0A CN113815825A (en) | 2021-10-26 | 2021-10-26 | Efficient damping raft frame based on L-shaped continuation structure |
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| CN113815825A true CN113815825A (en) | 2021-12-21 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9123644D0 (en) * | 1991-11-07 | 1992-01-02 | Orian Technology Ltd | Ship's hull vibration damper |
| CN102717885A (en) * | 2012-06-26 | 2012-10-10 | 上海交通大学 | Horizontal floating raft vibration isolation device |
| CN102748420A (en) * | 2012-06-26 | 2012-10-24 | 上海交通大学 | Mode conversion and vibration localization based chiral periodic structure buoyant raft |
| CN104595418A (en) * | 2015-02-02 | 2015-05-06 | 江苏高精机电装备有限公司 | Periodic-structure vibration isolation device based on bandgap filtration and waveform conversion |
| CN106402229A (en) * | 2016-06-20 | 2017-02-15 | 南京航空航天大学 | Shear type quasi zero rigidity vibration isolator and work method thereof |
| CN209083895U (en) * | 2018-11-19 | 2019-07-09 | 西安瑞霖电子科技有限公司 | A kind of zero stiffness isolation mounting of irrotational displacement |
-
2021
- 2021-10-26 CN CN202111244565.0A patent/CN113815825A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9123644D0 (en) * | 1991-11-07 | 1992-01-02 | Orian Technology Ltd | Ship's hull vibration damper |
| CN102717885A (en) * | 2012-06-26 | 2012-10-10 | 上海交通大学 | Horizontal floating raft vibration isolation device |
| CN102748420A (en) * | 2012-06-26 | 2012-10-24 | 上海交通大学 | Mode conversion and vibration localization based chiral periodic structure buoyant raft |
| CN104595418A (en) * | 2015-02-02 | 2015-05-06 | 江苏高精机电装备有限公司 | Periodic-structure vibration isolation device based on bandgap filtration and waveform conversion |
| CN106402229A (en) * | 2016-06-20 | 2017-02-15 | 南京航空航天大学 | Shear type quasi zero rigidity vibration isolator and work method thereof |
| CN209083895U (en) * | 2018-11-19 | 2019-07-09 | 西安瑞霖电子科技有限公司 | A kind of zero stiffness isolation mounting of irrotational displacement |
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Application publication date: 20211221 |
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