CN115263993A - Sensor metamaterial vibration isolator for underwater vehicle - Google Patents
Sensor metamaterial vibration isolator for underwater vehicle Download PDFInfo
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- CN115263993A CN115263993A CN202210805706.XA CN202210805706A CN115263993A CN 115263993 A CN115263993 A CN 115263993A CN 202210805706 A CN202210805706 A CN 202210805706A CN 115263993 A CN115263993 A CN 115263993A
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- metamaterial
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- vibration isolator
- underwater vehicle
- metamaterial vibration
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- 238000002955 isolation Methods 0.000 claims abstract description 26
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- 150000003839 salts Chemical class 0.000 description 2
- 206010063385 Intellectualisation Diseases 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical group [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
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Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/04—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means
- F16F15/08—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means with rubber springs ; with springs made of rubber and metal
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63C—LAUNCHING, HAULING-OUT, OR DRY-DOCKING OF VESSELS; LIFE-SAVING IN WATER; EQUIPMENT FOR DWELLING OR WORKING UNDER WATER; MEANS FOR SALVAGING OR SEARCHING FOR UNDERWATER OBJECTS
- B63C11/00—Equipment for dwelling or working underwater; Means for searching for underwater objects
- B63C11/52—Tools specially adapted for working underwater, not otherwise provided for
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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
- B63G8/00—Underwater vessels, e.g. submarines; Equipment specially adapted therefor
- B63G8/39—Arrangements of sonic watch equipment, e.g. low-frequency, sonar
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F1/00—Springs
- F16F1/36—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers
- F16F1/3605—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers characterised by their material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F1/00—Springs
- F16F1/36—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers
- F16F1/373—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers characterised by having a particular shape
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
- F16M11/00—Stands or trestles as supports for apparatus or articles placed thereon Stands for scientific apparatus such as gravitational force meters
- F16M11/02—Heads
- F16M11/04—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
- F16M13/00—Other supports for positioning apparatus or articles; Means for steadying hand-held apparatus or articles
- F16M13/02—Other supports for positioning apparatus or articles; Means for steadying hand-held apparatus or articles for supporting on, or attaching to, an object, e.g. tree, gate, window-frame, cycle
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F2230/00—Purpose; Design features
- F16F2230/32—Modular design
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F2230/00—Purpose; Design features
- F16F2230/40—Multi-layer
Abstract
The invention discloses a sensor metamaterial vibration isolator for an underwater vehicle, which belongs to the technical field of metamaterial and vibration and noise reduction and is characterized by comprising a main body and a metamaterial vibration isolation component; the main body is a structural body used for loading a sensor, and comprises a front structural part used for installing the sensor, a rear structural part used for connecting an underwater vehicle and an intermediate structural part connected between the front structural part and the rear structural part; the metamaterial vibration isolation component is formed by periodically arranging metamaterial basic cells and is arranged between the front structure part and the rear structure part. The vibration isolator can effectively block the transmission of mechanical noise generated by the attitude adjusting unit of the underwater vehicle to the end of the acoustic sensor so as to improve the working performance of the acoustic sensor of the underwater vehicle.
Description
Technical Field
The invention belongs to the technical field of metamaterials and vibration and noise reduction, and particularly relates to a sensor metamaterial vibration isolator for an underwater vehicle.
Background
With the progress of modern industrial technology, various equipment is continuously developed towards intellectualization, miniaturization and precision, and the problem of vibration noise of high-precision equipment is increasingly prominent. In recent years, the appearance and development of the acoustic metamaterial technology are mature, and a new theoretical basis and a new technical approach are provided for realizing vibration and noise reduction under a light condition. The acoustic metamaterial is a material or structure formed by periodically arranging specially designed artificial structural units, is also called an artificial periodic structure, has supernormal acoustic properties which are not possessed by natural materials, and can realize artificial control on macroscopic physical parameters of the material, such as modulus, rigidity, density and the like on the premise of ensuring mechanical properties.
The underwater vehicle generally comprises a pressure-resistant main body unit, a task sensor unit, an attitude adjusting and energy source unit, a navigation control unit, a communication unit, a buoyancy driving unit, a propeller propelling unit and the like, wherein the propeller propelling, buoyancy driving and attitude adjusting unit of the underwater vehicle without optimized design can actively excite and generate noise in the sailing process, and influence the sensing and detection of an acoustic sensor serving as the task sensor unit to a certain extent. The attitude adjusting unit generates vibration noise due to actions of the pitching adjusting mechanism and the rolling adjusting mechanism and uneven load, the vibration noise is transmitted to the main shell of the aircraft through a fixed rib ring in the pressure-resistant main body unit, and finally the vibration noise is transmitted to a sensing unit of the acoustic sensor through a sensor fixed suspension and surrounding fluid and is picked up by the sensing unit to influence the working effect of the sensor.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the metamaterial vibration isolator for the underwater vehicle, which solves the problem that the working performance of an acoustic sensor is influenced by vibration noise generated by the existing underwater vehicle.
The invention is realized in such a way, and the metamaterial vibration isolator for the sensor of the underwater vehicle is characterized by comprising a main body and a metamaterial vibration isolating part; the main body is a structural body used for loading a sensor, and comprises a front structural part used for installing the sensor, a rear structural part used for connecting an underwater vehicle and an intermediate structural part connected between the front structural part and the rear structural part; the metamaterial vibration isolation component is formed by periodically arranging metamaterial basic cells and is arranged between the front structure part and the rear structure part.
In the above technical solution, preferably, an annular groove is formed among the periphery of the middle structural part, the front structural part and the rear structural part, and a plurality of metamaterial vibration isolation members are uniformly distributed circumferentially in the annular groove.
In the above technical solution, preferably, the metamaterial base cell is a six-sided frame structure formed by surrounding six walls, and the six walls include two lateral straight walls that are symmetrical left and right and four lateral oblique walls that are symmetrical up and down.
In the above technical solution, preferably, the metamaterial vibration isolation member includes two basic cells, the basic cells use symmetrical center lines of two straight walls on two sides as axes, the two basic cells are coaxially disposed, one end of each basic cell is connected to form the metamaterial vibration isolation member, and the other ends of the two basic cells are respectively connected to the front structural part and the rear structural part.
In the above technical solution, preferably, the front structural portion and the rear structural portion are annular disks, the middle structural portion is a cylinder connected between the front structural portion and the rear structural portion, and the front structural portion, the rear structural portion and the middle structural portion are coaxial and have an axis parallel to an axis of the foundation cell.
In the above technical solution, preferably, the front structure portion is provided with an ear plate for mounting the sensor, and the ear plate is circumferentially and uniformly distributed at an end of the front structure portion.
In the above technical solution, preferably, the two base cells and the front structural portion or the rear structural portion are connected by bolts.
The invention has the advantages and effects that:
the invention provides a metamaterial vibration isolator for a sensor of an underwater vehicle, which is characterized in that a metamaterial vibration isolation part is combined with a main body, the main body is used as the main body for carrying the sensor, and the metamaterial vibration isolation part and the main body are used for connecting the sensor and a front structure part and a rear structure part of the underwater vehicle to form a layered structure arranged along a vibration noise transmission path, so that the transmission of mechanical noise generated by an attitude adjusting unit of the underwater vehicle to an acoustic sensor end can be effectively blocked, and the working performance of the acoustic sensor of the underwater vehicle is improved. The metamaterial MCU100 adopted by the invention is a high-modulus high-strength low-creep polyurethane material developed through a GFKGJGJCL customs project, and the environmental suitability of oil resistance, salt spray resistance, ozone resistance, mould resistance, high and low temperature resistance, flame retardance and the like is detected by related national military standards. The metamaterial can effectively block noise in a specific frequency band, mechanical noise generated by an underwater vehicle is in the blocking frequency band of the metamaterial, and the mechanical noise is completely blocked when passing through the metamaterial vibration isolator in the transmission process.
Drawings
FIG. 1 is a schematic structural view of the vibration isolator of the present invention;
fig. 2 is a schematic diagram of a basic cell structure according to the present invention;
fig. 3 is a schematic structural view of a vibration isolating member according to the present invention;
FIG. 4 is a functional schematic diagram of the vibration isolator of the present invention;
fig. 5 is a view illustrating an example of installation of the vibration isolator according to the present invention;
FIG. 6 is a graph of the vibration isolation coefficient of the embodiment of the present invention at different input frequencies.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
In order to solve the problem that the working performance of an acoustic sensor can be influenced by vibration noise generated by the existing underwater vehicle, the invention particularly provides the metamaterial vibration isolator for the underwater vehicle. To further illustrate the structure of the present invention, the following detailed description is made with reference to the accompanying drawings:
referring to fig. 1, the sensor metamaterial vibration isolator for the underwater vehicle comprises a main body and a metamaterial vibration isolation component 1.
The main body is a structural body for loading a sensor, and the main body is used as a carrier for arranging the sensor on an underwater vehicle. The body comprises a front structural part 2 for mounting sensors, a rear structural part 3 for connection to an underwater vehicle and an intermediate structural part 4 connected between the front and rear structural parts. In this embodiment, specifically, the front structure portion and the rear structure portion are annular disks, the middle structure portion is a cylinder connected between the front structure portion and the rear structure portion, the front structure portion, the rear structure portion and the middle structure portion are coaxial, and the front structure portion, the rear structure portion and the middle structure portion are an integral aluminum structure. Circumferential grooves are formed among the periphery of the middle structure part, the front structure part and the rear structure part. The front structure part is provided with an ear plate 5 for mounting the sensor, and the four ear plates are uniformly distributed at the end part of the front structure part in the circumference. The lug plate is a plate body which extends outwards and is radially distributed, bolt holes for mounting the sensor are processed on the plate body, and the sensor is mounted on the lug plate through a bolt and nut assembly penetrating through the bolt holes.
The metamaterial vibration isolation component is formed by periodically arranging metamaterial basic cells and is arranged between the front structure part and the rear structure part.
The metamaterial is an artificial structural material and is formed by periodically arranging basic cells (small unit bodies), and the metamaterial has the characteristics which are not possessed by the traditional material. In the embodiment, the metamaterial is a high-modulus high-strength low-creep polyurethane material with the Young modulus E of a base material =100Mpa and the Poisson ratio v =0.475, and has the characteristics of oil resistance, salt mist resistance, ozone resistance, mould resistance, high and low temperature resistance, flame retardance and the like.
Referring to fig. 2 and 3, in the present embodiment, specifically, four dry metamaterial vibration isolation components are circumferentially and uniformly distributed in the circumferential groove of the main body. The structure of the metamaterial basic cell is as follows: six plate-shaped walls surround to form an axisymmetrical six-sided frame structure, and the six plate-shaped walls comprise two bilaterally symmetric straight walls and four vertically symmetric lateral inclined walls. The basic cell takes the symmetrical middle line of the two side straight walls as an axis. In the embodiment, the metamaterial basic cell unit is optimized in structural parameters by using a homogenization theory, and the length L1 of a side inclined wall (inclined arm) of the basic cell unit, the included angle alpha between the side inclined wall and a horizontal line, the thickness d2 of the side inclined wall, the axial height H3 of the basic cell unit, the height H2 of a central hole in a frame of the basic cell unit, the thickness d1 of a side straight wall (force arm) and the depth L2 of the basic cell unit are designed. The metamaterial formed by periodically arranging and connecting basic cells can change the macroscopic mechanical property of the metamaterial, realize a specific modulus matrix, customize the natural frequency of the vibration isolator and achieve the required vibration reduction effect.
In this embodiment, the metamaterial vibration isolation member includes two basic cells, and the two basic cells are arranged periodically: the two basic cells are coaxially arranged, and one end parts of the two basic cells are connected to form the metamaterial vibration isolation component. The other ends of the two basic cells are respectively connected with the front structure part and the rear structure part. In order to ensure reliable connection of the metamaterial vibration isolation member to the front structure portion and the rear structure portion, both end portions of the metamaterial vibration isolation member are manufactured to be in a planar end face shape by using the same material as the base cells, and the front structure portion or the rear structure portion of the two base cells are connected by bolts. In this embodiment, four grooves having a size corresponding to the end surface of the metamaterial vibration isolation member are uniformly circumferentially distributed on the inner annular end surfaces of the front structure part and the rear structure part of the annular disk body structure, two ends of the metamaterial vibration isolation member are respectively and fittingly installed in the grooves corresponding to the front structure part and the rear structure part, and two ends of the metamaterial vibration isolation member are connected with the front structure part and the rear structure part by bolts.
In this embodiment, the metamaterial vibration isolator can be simplified into a spring vibrator model, please refer to fig. 4, and plays roles of vibration isolation and buffering between the input end and the output end.
Referring to fig. 5, the mounting state of the vibration isolator is as follows: the metamaterial vibration isolator is arranged on the front end face of the acoustic connecting rod 6, the front structure part of the metamaterial vibration isolator is connected with the acoustic sensor, the rear end of the acoustic connecting rod is connected with the front cabin body of the underwater vehicle, and the front end of the acoustic connecting rod is connected with the rear structure part of the metamaterial vibration isolator. The vibration noise is transmitted to the metamaterial vibration isolator from the front cabin body of the underwater vehicle through the acoustic connecting rod, and is blocked by the metamaterial vibration isolator, so that the vibration noise is prevented from being transmitted to the acoustic sensor, and the working quality of the acoustic sensor is guaranteed.
Referring to fig. 6, in the present embodiment, in the parameters of the metamaterial vibration isolator, the natural frequency is 25.56Hz, and the damping ratio is 0.07, and experiments verify that a vibration isolation coefficient curve at different input frequencies can be obtained, and it can be seen that the vibration isolator has a good vibration isolation effect when the vibration frequency of the vibration source is greater than 40 Hz.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A sensor metamaterial vibration isolator for an underwater vehicle comprising:
a body that is a structure for carrying a sensor, the body comprising a front structure for mounting the sensor, a rear structure for connecting an underwater vehicle, and an intermediate structure connected between the front and rear structures;
and the metamaterial vibration isolation component is formed by periodically arranging metamaterial basic cells and is arranged between the front structure part and the rear structure part.
2. The sensor metamaterial vibration isolator for underwater vehicles as claimed in claim 1, wherein circumferential grooves are formed between the outer periphery of the middle structure, the front structure and the rear structure, and a plurality of metamaterial vibration isolation members are circumferentially and uniformly distributed in the circumferential grooves.
3. The sensor metamaterial vibration isolator for underwater vehicles as claimed in claim 2, wherein the metamaterial base cell is a six-sided frame structure formed by enclosing six shaped walls including two side straight walls that are symmetrical left and right and four side inclined walls that are symmetrical up and down.
4. The sensor metamaterial vibration isolator for underwater vehicles as claimed in claim 3, wherein the metamaterial vibration isolation member comprises two base cells, the base cells are arranged coaxially with a symmetrical center line of the two side straight walls as an axis, one end of each base cell is connected to form the metamaterial vibration isolation member, and the other end of each base cell is connected to the front structure part and the rear structure part respectively.
5. The sensor metamaterial vibration isolator for underwater vehicles as claimed in claim 4, wherein the front and rear structural portions are toroidal discs and the intermediate structural portion is a cylinder connected between the front and rear structural portions, the front, rear and intermediate structural portions being coaxial and having an axis parallel to the axis of the base cell.
6. The sensor metamaterial vibration isolator for underwater vehicles as claimed in claim 5, wherein the front structure is provided with ear plates for mounting sensors, the ear plates being circumferentially distributed at the ends of the front structure.
7. The sensor metamaterial vibration isolator for underwater vehicles as claimed in claim 6, wherein the two base cells are bolted to the front structural portion or the rear structural portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210805706.XA CN115263993A (en) | 2022-07-08 | 2022-07-08 | Sensor metamaterial vibration isolator for underwater vehicle |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210805706.XA CN115263993A (en) | 2022-07-08 | 2022-07-08 | Sensor metamaterial vibration isolator for underwater vehicle |
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| CN105650180A (en) * | 2016-03-04 | 2016-06-08 | 武汉第二船舶设计研究所 | Ultralow-frequency and shock-resistance metamaterial vibration isolating device |
| CN106567900A (en) * | 2016-11-01 | 2017-04-19 | 中国船舶重工集团公司第七〇九研究所 | Metamaterial vibration isolator |
| CN108860532A (en) * | 2018-07-11 | 2018-11-23 | 哈尔滨工程大学 | A kind of omnidirectional's revolution submarine navigation device |
| CN110439947A (en) * | 2019-08-16 | 2019-11-12 | 沈阳智振科技有限公司 | A kind of vibration isolator based on diamond shape periodic structure |
| KR20200063883A (en) * | 2018-11-28 | 2020-06-05 | 한양대학교 산학협력단 | Meta material to have negative poisson’s ratio and optimizing method to deduct optimal shape |
| CN112610646A (en) * | 2020-11-10 | 2021-04-06 | 武汉第二船舶设计研究所(中国船舶重工集团公司第七一九研究所) | Active and passive metamaterial vibration isolation method for structural coupling patch |
| CN113148073A (en) * | 2021-03-25 | 2021-07-23 | 天津大学 | Acoustic observation autonomous underwater vehicle |
-
2022
- 2022-07-08 CN CN202210805706.XA patent/CN115263993A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105650180A (en) * | 2016-03-04 | 2016-06-08 | 武汉第二船舶设计研究所 | Ultralow-frequency and shock-resistance metamaterial vibration isolating device |
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| CN108860532A (en) * | 2018-07-11 | 2018-11-23 | 哈尔滨工程大学 | A kind of omnidirectional's revolution submarine navigation device |
| KR20200063883A (en) * | 2018-11-28 | 2020-06-05 | 한양대학교 산학협력단 | Meta material to have negative poisson’s ratio and optimizing method to deduct optimal shape |
| CN110439947A (en) * | 2019-08-16 | 2019-11-12 | 沈阳智振科技有限公司 | A kind of vibration isolator based on diamond shape periodic structure |
| CN112610646A (en) * | 2020-11-10 | 2021-04-06 | 武汉第二船舶设计研究所(中国船舶重工集团公司第七一九研究所) | Active and passive metamaterial vibration isolation method for structural coupling patch |
| CN113148073A (en) * | 2021-03-25 | 2021-07-23 | 天津大学 | Acoustic observation autonomous underwater vehicle |
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