JP6979781B2 - Hull structure of a ship and manufacturing method of anti-vibration device - Google Patents
Hull structure of a ship and manufacturing method of anti-vibration device Download PDFInfo
- Publication number
- JP6979781B2 JP6979781B2 JP2017079127A JP2017079127A JP6979781B2 JP 6979781 B2 JP6979781 B2 JP 6979781B2 JP 2017079127 A JP2017079127 A JP 2017079127A JP 2017079127 A JP2017079127 A JP 2017079127A JP 6979781 B2 JP6979781 B2 JP 6979781B2
- Authority
- JP
- Japan
- Prior art keywords
- vibration
- plate
- vibration isolator
- ship
- hull
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 13
- 239000007788 liquid Substances 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 11
- 210000001015 abdomen Anatomy 0.000 claims description 4
- 238000002955 isolation Methods 0.000 claims 1
- 230000005855 radiation Effects 0.000 description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 239000002828 fuel tank Substances 0.000 description 5
- 238000013016 damping Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 239000013505 freshwater Substances 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000003187 abdominal effect Effects 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Images
Landscapes
- Vibration Prevention Devices (AREA)
Description
本発明は、船舶の船体構造及び防振器の製造方法に関する。 The present invention relates to a hull structure of a ship and a method for manufacturing a vibration isolator.
海洋研究船などの船舶は、一般に、その船体構造が単殻構造とされている。この船舶はの外板は、船底に配置されたタンクを介した船外への音響透過エネルギーが大きく、また、例えば数ｋＨｚ〜数百ｋＨｚのソナー周波数域での音響放射効率が大きい。 Ships such as marine research vessels generally have a single-shell structure. The outer panel of this ship has a large acoustic transmission energy to the outside of the ship through a tank arranged at the bottom of the ship, and has a large acoustic radiation efficiency in the sonar frequency range of, for example, several kHz to several hundred kHz.
また、例えば、特許文献１、特許文献２のように、船体の外板から放射される水中放射雑音を低減するための各種手段が提案、実用化されている。
Further, for example, as in
一方、船底には燃料タンク、清水タンクが配置されていることなどから、外板の制振処理が十分に行えない、あるいは不可能な場合がある。 On the other hand, since the fuel tank and the fresh water tank are arranged on the bottom of the ship, it may not be possible or impossible to sufficiently suppress the vibration of the outer panel.
例えば、海洋研究船などにおいては、主機関によって発生した振動エネルギーが船体構造へと伝搬し、さらに音響エネルギーとして水中に放射される。水中へ放射された音響エネルギーは、船体各部に配置された観測用音響機器（ソナー）位置まで伝搬し、ソナーの信号、雑音比（Ｓ／Ｎ）の低下要因となる。 For example, in an oceanographic research vessel, the vibration energy generated by the main engine propagates to the hull structure and is further radiated into the water as sound energy. The acoustic energy radiated into the water propagates to the positions of the observation acoustic devices (sonar) arranged in each part of the hull, and becomes a factor of lowering the sonar signal and the noise ratio (S / N).
ここで、振動する板から放射される音響強度Ｗは、板の振動速度Ｖ２、音響放射効率σの積に比例する（Ｗ∝σ（Ｖ２））。 Here, the acoustic intensity W radiated from the vibrating plate is proportional to the product of the vibration speed V 2 of the plate and the acoustic radiation efficiency σ (W ∝ σ (V 2 )).
また、放射効率σと周波数ｆの関係は、コインシデンス周波数ｆｃで放射効率σが最大となり、ｆ＞ｆｃでσ＝１となる。コインシデンス周波数ｆｃは、板の曲げ剛性Ｂ、面密度ｍ’、板厚ｈ、音響放射の対象となる媒質の音速ｃとしたとき、ｆｃ＝ｃ２／（２πｈ）・√（ｍ’／Ｂ）で表される。 Further, regarding the relationship between the radiation efficiency σ and the frequency f, the radiation efficiency σ becomes maximum at the coincidence frequency f c , and σ = 1 when f> f c. The coincidence frequency f c is f c = c 2 / (2πh) · √ (m'/, where the flexural rigidity B of the plate, the surface density m', the plate thickness h, and the sound velocity c of the medium to be acoustically radiated. It is represented by B).
そして、水中の音速をｃ＝１５００ｍ／ｓとし、船体外板の板厚をｈ＝１０〜２０ｍｍとすると、コインシデンス周波数はｆｃ＝２３〜１１．５ｋＨｚとなり、ソナー周波数とほぼ一致する。 Then, the water sound velocity and c = 1500 m / s, when the thickness of the hull and h = 10 to 20 mm, coincidence frequency substantially coincides with f c = 23~11.5kHz next, sonar frequency.
これにより、従来、ソナー周波数域の音響放射強度が増大し、主機関の防振材、外板制振処理などによる水中放射雑音低減効果、言い換えればＳ／Ｎ改善効果が十分に得られないケースがある。 As a result, the acoustic radiation intensity in the sonar frequency range has been increased, and the underwater radiation noise reduction effect, in other words, the S / N improvement effect, cannot be sufficiently obtained by the vibration damping material of the main engine and the outer panel vibration damping treatment. There is.
また、船底に設けられた燃料タンクや清水タンクの内部に制振処理を施そうとした場合に従来手法では制約が多く、十分な水中放射雑音低減効果を得ることが難しい。 Further, when it is attempted to apply vibration damping treatment to the inside of the fuel tank or the fresh water tank provided on the bottom of the ship, there are many restrictions by the conventional method, and it is difficult to obtain a sufficient effect of reducing underwater radiation noise.
本発明は上記課題に鑑みてなされたものであって、音響放射雑音を低減させ、高性能のソナー探査を実現することができる船舶の船体構造及び防振器の製造方法を提供することを目的とする。 The present invention has been made in view of the above problems, and an object of the present invention is to provide a hull structure of a ship and a method for manufacturing a vibration isolator capable of reducing acoustic radiation noise and realizing high-performance sonar exploration. And.
本発明の一態様に係る船舶の船体構造は、船体の構成要素の液体に浸かる部分に設けられる防振器を備える船舶の船体構造であって、前記防振器は、前記構成要素のパネル振動モードに応じた振動の腹の位置に固定して設けられる支柱と、板面が前記支柱の延在方向と交差するように、且つ、前記構成要素と間隔をあけて前記支柱に一体に設けられ、前記板面である一面から他面に貫通し、前記液体が通過する複数の孔を有するダンパ板とからなる。 The hull structure of a ship according to one aspect of the present invention is a hull structure of a ship provided with a vibration isolator provided in a portion of the hull that is immersed in a liquid, and the vibration isolator is a panel vibration of the component. A strut fixedly provided at the position of the antinode of vibration according to the mode and a strut are integrally provided on the strut so that the plate surface intersects the extending direction of the strut and at a distance from the component. , penetrates the other surface from one surface of said plate surface, wherein the liquid consists of a damper plate having a plurality of holes passing through.
船体構造の構成要素である外板などの水や油などの液体に浸かる部分に支柱及びダンパ板からなる防振器を取り付けることによって、液体中の防振器で音響エネルギーなどの振動エネルギーを減衰させることができる。これにより、液体中に配設した防振器で音響エネルギーなどの水中への透過損失を増大させることができる。 By attaching a vibration isolator consisting of columns and damper plates to the part of the hull that is immersed in liquid such as water or oil, such as the outer panel, the vibration isolator in the liquid attenuates vibration energy such as acoustic energy. Can be made to. As a result, it is possible to increase the transmission loss of acoustic energy or the like into water by the vibration isolator disposed in the liquid.
上記船舶の船体構造においては、前記ダンパ板が板面である一面から他面に貫通する複数の孔を備えていてもよい。 In the hull structure of the ship, the damper plate may be provided with a plurality of holes penetrating from one surface of the plate surface to the other surface.
上記船舶の船体構造においては、前記ダンパ板は、端部側の板厚が中央部の板厚よりも大きく形成されていてもよい。 In the hull structure of the ship, the damper plate may be formed so that the plate thickness on the end side is larger than the plate thickness on the central portion.
本発明の防振器の製造方法は、船体の構成要素の液体に浸かる部分に設けられる防振器であって、前記構成要素のパネル振動モードに応じた振動の腹の位置に固定して設けられる支柱と、板面が前記支柱の延在方向と交差するように、且つ、前記構成要素と間隔をあけて前記支柱に一体に設けられるダンパ板とからなり、前記ダンパ板は、板面である一面から他面に貫通し、液体が通過する複数の孔を有する防振器を製造する方法であって、前記構成要素のパネル振動モードにおける腹の位置を特定する工程と、前記構成要素の固有振動数を特定する工程と、前記防振器の剛性を決定する工程と、前記防振器の許容最大サイズに基づいて前記ダンパ板の大きさを決定する工程と、前記腹の位置に前記支柱を配置する工程と、を有する。 The method for manufacturing a vibration isolator of the present invention is a vibration isolator provided in a portion of a hull that is immersed in liquid, and is fixedly provided at the position of the antinode of vibration according to the panel vibration mode of the component. a post which is, as the plate surface intersects with the extending direction of the strut, and, Ri Do and a damper plate provided integrally with the strut at a said component and spacing, the damper plate, the plate surface penetrates the other surface from one surface is directed to a method of manufacturing the vibration isolating device that having a plurality of holes which liquid passes, and specifying the position of the antinodes of the panel vibration mode of the component, the identifying a natural frequency component, and determining the stiffness of the vibration isolators, and determining the magnitude of the vibration isolators the damper plate on the basis of the maximum allowable size of the abdominal It has a step of arranging the support column at a position.
また、本発明の防振器の製造方法においては、前記固有振動数と前記ダンパ板の大きさとに基づいて前記孔の大きさ及び数を決定する工程を備えることが望ましい。 In the vibration isolating device production method of the present invention, it is desirable to have a process for determining the size and number of the holes on the basis of the previous SL natural frequency and the size of the damper plate.
本発明によれば、音響放射雑音を低減させ、高性能のソナー探査を実現することができる。 According to the present invention, acoustic radiation noise can be reduced and high-performance sonar exploration can be realized.
以下、図１から図４を参照し、本発明の一実施形態に係る船舶の船体構造及び防振器の製造方法について説明する。なお、本実施形態は、海洋研究船などの水中放射雑音の低減が求められる船舶の船体構造に関するものである。 Hereinafter, with reference to FIGS. 1 to 4, a ship hull structure and a method for manufacturing a vibration isolator according to an embodiment of the present invention will be described. The present embodiment relates to a hull structure of a ship such as a marine research vessel, which is required to reduce underwater radiation noise.
本実施形態の船舶の船体構造Ａは、図１及び図２に示すように、船体１の構成要素のうち、水や油などの液体に浸かる部分（例えば、燃料タンクの内壁面）に一端を固定して設置される支柱３と、板面が支柱３の延在方向と交差するように、且つ船体１の構成要素と所定の間隔をあけて支柱に一体に設けられるダンパ板４とからなる防振器Ｂを備えて構成されている。
As shown in FIGS. 1 and 2, the hull structure A of the ship of the present embodiment has one end at a portion (for example, the inner wall surface of a fuel tank) of the components of the
本実施形態では、船体１の液体に浸かる構成要素が船体１の外板などであり、複数の防振器Ｂが分散配置して取り付けられている。例えば、図１に示すように、船底に主機関６を支持する支持板などが設けられ、この支持板や外板に複数の防振器Ｂが分散配置して取り付けられている。そして、これら複数の防振器Ｂは船舶の航行時に燃料タンクに貯留した燃料油等の液体に浸漬した状態になる。
In the present embodiment, the component immersed in the liquid of the
また、本実施形態のダンパ板４は、図２に示すように、一方の板面から他方の板面に貫通する複数の貫通孔５を備えて形成されている。なお、ダンパ板は円形の貫通孔５に限らず、切り込み（スリット：貫通孔）を備えて形成されていてもよい。 Further, as shown in FIG. 2, the damper plate 4 of the present embodiment is formed to have a plurality of through holes 5 penetrating from one plate surface to the other plate surface. The damper plate is not limited to the circular through hole 5, and may be formed with a notch (slit: through hole).
さらに、本実施形態のダンパ板４は、支柱３に固着される中央部よりも端部側の板厚を大にして形成されている。
Further, the damper plate 4 of the present embodiment is formed so that the plate thickness on the end portion side of the central portion fixed to the
このような防振器Ｂの規格を設定する（防振器Ｂを製造する）際には、まず、防振器Ｂを設置する振動物の固有振動数（低減しようとする音響の周波数）を特定する。そして、特定した固有振動数に基づいて防振器Ｂの剛性（バネ定数）を決定する。さらに、防振器Ｂの許容最大サイズに基づいてダンパ板４の大きさを決定する。また、振動物の音響の大きさに基づいてバネ先端の重量、貫通孔５の大きさ、位置、及び数を決定する。 When setting the standard of the vibration isolator B (manufacturing the vibration isolator B), first, the natural frequency (acoustic frequency to be reduced) of the vibrating object in which the vibration isolator B is installed is set. Identify. Then, the rigidity (spring constant) of the vibration isolator B is determined based on the specified natural frequency. Further, the size of the damper plate 4 is determined based on the maximum allowable size of the vibration isolator B. Further, the weight of the tip of the spring, the size, the position, and the number of the through holes 5 are determined based on the acoustic magnitude of the vibrating object.
そして、上記構成からなる本実施形態の防振器Ｂを設けた船舶の船体構造Ａにおいては、船体構造Ａの外板に防振器Ｂを分散して取り付けるとともに、この防振器Ｂを液体中に配設することによって、燃料タンク内などの音響エネルギー（振動エネルギー）の水中への透過損失を増大させることが可能になる。 Then, in the hull structure A of the ship provided with the vibration isolator B of the present embodiment having the above configuration, the vibration isolator B is dispersedly attached to the outer plate of the hull structure A, and the vibration isolator B is attached to the liquid. By arranging it inside, it becomes possible to increase the transmission loss of the acoustic energy (vibration energy) in the water such as in the fuel tank.
また、ダンパ板４に貫通孔５が設けられていることにより、液体がこの貫通孔５を通過することによって振動の抵抗が増加し、音響エネルギーを効果的に減衰させることができる。 Further, since the damper plate 4 is provided with the through hole 5, the resistance of vibration is increased by the liquid passing through the through hole 5, and the acoustic energy can be effectively attenuated.
さらに、図３に示すように、ダンパ板４の端部側が中央部よりも厚肉で形成されていることにより、振動エネルギーが伝搬するとともに端部側を共振（振幅）させ、音響エネルギーをより効果的に減衰させることが可能になる。 Further, as shown in FIG. 3, since the end side of the damper plate 4 is formed to be thicker than the center part, the vibration energy propagates and the end side is resonated (amplitude) to increase the acoustic energy. It becomes possible to attenuate effectively.
なお、図４に示すように、船体１の構成要素のパネル振動モード（振動周波数、及び、振動の“腹”の位置）を特定し、このパネル振動モードに応じた振動の“腹”の位置のそれぞれに防振器Ｂを配置することで、さらに効果的且つ効率的に音響エネルギーの減衰効果を得ることができる。なお、防振器Ｂの配置数（Ｘ個×Ｙ個）により、防振器Ｂの許容最大サイズが定められる。
As shown in FIG. 4, the panel vibration mode (vibration frequency and the position of the vibration "belly") of the constituent elements of the
また、追設の外板は強度部材としての外板に追設した音響反射面であるため、比強度の小さな制振鋼板を利用することができ、放射面の振動速度を低減させることができるとともに、ソナーのＳ／Ｎを向上させることが可能になる。 Further, since the additional outer plate is an acoustic reflection surface added to the outer plate as a strength member, a vibration damping steel plate having a small specific strength can be used, and the vibration speed of the radial surface can be reduced. At the same time, it becomes possible to improve the S / N of the sonar.
よって、本実施形態の船舶の船体構造Ａ及び防振器Ｂの製造方法によれば、音響放射雑音を大幅に低減させ、高性能のソナー探査を実現することが可能になる。 Therefore, according to the method for manufacturing the hull structure A and the vibration isolator B of the ship of the present embodiment, it is possible to significantly reduce the acoustic radiation noise and realize high-performance sonar exploration.
以上、本発明に係る船舶の船体構造及び防振器の製造方法の一実施形態について説明したが、本発明は上記の一実施形態に限定されるものではなく、その趣旨を逸脱しない範囲で適宜変更可能である。 Although the embodiment of the hull structure of the ship and the method of manufacturing the vibration isolator according to the present invention has been described above, the present invention is not limited to the above-mentioned embodiment and is appropriately used without departing from the spirit of the present invention. It can be changed.
１ 船体
３ 支柱
４ ダンパ板
５ 貫通孔
６ 主機関
Ａ 船舶の船体構造
Ｂ 防振器
1
Claims (4)
前記防振器は、前記構成要素のパネル振動モードに応じた振動の腹の位置に固定して設けられる支柱と、
板面が前記支柱の延在方向と交差するように、且つ、前記構成要素と間隔をあけて前記支柱に一体に設けられ、前記板面である一面から他面に貫通し、前記液体が通過する複数の孔を有するダンパ板とからなる、船舶の船体構造。 A hull structure of a ship equipped with a vibration isolator provided in a part of the hull that is immersed in liquid.
The vibration isolator includes a support column fixedly provided at the position of the antinode of vibration according to the panel vibration mode of the component, and a support.
As the plate surface intersects with the extending direction of the strut, and is provided integrally with the strut at a said component and spacing, penetrate the other surface from one surface of said plate surface, the liquid is passed The hull structure of a ship, consisting of a damper plate with multiple holes.
板面が前記支柱の延在方向と交差するように、且つ、前記構成要素と間隔をあけて前記支柱に一体に設けられるダンパ板とからなり、前記ダンパ板は、板面である一面から他面に貫通し、液体が通過する複数の孔を有する防振器を製造する方法であって、
前記構成要素のパネル振動モードにおける腹の位置を特定する工程と、
前記構成要素の固有振動数を特定する工程と、
前記防振器の剛性を決定する工程と、
前記防振器の許容最大サイズに基づいて前記ダンパ板の大きさを決定する工程と、
前記腹の位置に前記支柱を配置する工程と、を有する防振器の製造方法。 A vibration isolator provided in the part of the hull that is immersed in liquid, and a support that is fixedly provided at the position of the antinode of vibration according to the panel vibration mode of the component.
The plate surface is composed of a damper plate that is integrally provided on the support column so as to intersect the extending direction of the support column and at a distance from the component, and the damper plate is from one surface that is the plate surface to the other. A method of manufacturing a vibration isolator with multiple holes that penetrate a surface and allow a liquid to pass through.
The step of specifying the position of the belly in the panel vibration mode of the component, and
The process of specifying the natural frequency of the component and
The process of determining the rigidity of the vibration isolator and
The process of determining the size of the damper plate based on the maximum allowable size of the vibration isolator, and
A method for manufacturing a vibration isolator, comprising a step of arranging the support column at the position of the belly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017079127A JP6979781B2 (en) | 2017-04-12 | 2017-04-12 | Hull structure of a ship and manufacturing method of anti-vibration device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017079127A JP6979781B2 (en) | 2017-04-12 | 2017-04-12 | Hull structure of a ship and manufacturing method of anti-vibration device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2018176985A JP2018176985A (en) | 2018-11-15 |
| JP6979781B2 true JP6979781B2 (en) | 2021-12-15 |
Family
ID=64282332
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2017079127A Active JP6979781B2 (en) | 2017-04-12 | 2017-04-12 | Hull structure of a ship and manufacturing method of anti-vibration device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP6979781B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116374077A (en) * | 2023-04-07 | 2023-07-04 | 中国船舶科学研究中心 | Modular truss type floating raft vibration isolation device and vibration isolation and stability maintenance method |
Family Cites Families (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60188244U (en) * | 1984-05-23 | 1985-12-13 | 日立造船株式会社 | dynamic vibration absorber |
| JPS61122092A (en) * | 1984-11-16 | 1986-06-10 | Daihatsu Diesel Kk | Method for suppressing ship vibration and dynamic vibration absorption type vibration isolator for ships |
| JPS62194049A (en) * | 1986-02-18 | 1987-08-26 | Nippon Kokan Kk <Nkk> | Vibration absorbing device |
| JPH0645360B2 (en) * | 1988-11-22 | 1994-06-15 | 株式会社新来島どっく | Dynamic vibration absorber |
| JPH0282691U (en) * | 1988-12-14 | 1990-06-26 | ||
| JP3555035B2 (en) * | 1991-07-24 | 2004-08-18 | オイレス工業株式会社 | Dynamic vibration absorber |
| JPH06257638A (en) * | 1994-02-04 | 1994-09-16 | Komatsu Ltd | Liquid filled rubber mount |
| JP3192910B2 (en) * | 1995-02-27 | 2001-07-30 | 三菱重工業株式会社 | Tanker tank structure |
| JP4124835B2 (en) * | 1995-10-27 | 2008-07-23 | 一登 背戸 | Design method of multiple dynamic vibration absorber |
| JPH09150786A (en) * | 1995-11-30 | 1997-06-10 | Mitsubishi Heavy Ind Ltd | Ship having damping structure using liquid |
| JP3733187B2 (en) * | 1996-11-26 | 2006-01-11 | オイレス工業株式会社 | Variable dynamic vibration absorber |
| JP2002266940A (en) * | 2001-03-08 | 2002-09-18 | Alps Electric Co Ltd | Manufacturing method of dynamic vibration absorber and dynamic vibration absorber |
| JP3659920B2 (en) * | 2002-01-10 | 2005-06-15 | 三菱重工業株式会社 | Ship damping device mounting structure |
| JP2003205895A (en) * | 2002-01-10 | 2003-07-22 | Mitsubishi Heavy Ind Ltd | Ship provided with damping device |
| JP2010132112A (en) * | 2008-12-04 | 2010-06-17 | Ihi Marine United Inc | Power generation device using hull vibration |
| JP5804753B2 (en) * | 2011-04-07 | 2015-11-04 | 三菱重工業株式会社 | Floating body |
| KR101752653B1 (en) * | 2011-08-22 | 2017-06-30 | 현대중공업 주식회사 | Dynamic vibration absorber systen for low frequency sound insulation |
| JP2015120448A (en) * | 2013-12-24 | 2015-07-02 | 三菱重工業株式会社 | Antimotion device and ship |
-
2017
- 2017-04-12 JP JP2017079127A patent/JP6979781B2/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| JP2018176985A (en) | 2018-11-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3907062A (en) | Compliant blanket acoustic baffle | |
| JP6979781B2 (en) | Hull structure of a ship and manufacturing method of anti-vibration device | |
| CN101723078B (en) | Vibration isolation mass rigid vibration isolation structure for bulkhead of ship | |
| CN104776142B (en) | Tower Buoyant Raft Shock-resistant System | |
| Dylejko | Optimum resonance changer for submerged vessel signature reduction. | |
| CA2962492C (en) | Omnidirectional antenna | |
| Fischer et al. | Noise and Vibration Control on Ships | |
| JPH0854458A (en) | Array plate for craft | |
| KR20130021055A (en) | Dynamic vibration absorber systen for low frequency sound insulation | |
| KR20120089146A (en) | Acoustic Anechoic Rubber Tile And Underwater Vehicle Having The Same | |
| Pais et al. | Experimental and numerical analysis of absorber materials for steel decks | |
| CN109229278B (en) | Ship vibration reduction structure and ship | |
| JP3659920B2 (en) | Ship damping device mounting structure | |
| JP6497663B2 (en) | Ship | |
| JPH09150786A (en) | Ship having damping structure using liquid | |
| US20210062503A1 (en) | System and method of damping vibrations of tower structures | |
| Zhao et al. | Vibration and sound radiation of cylindrical shell covered with a skin made of micro floating raft arrays excited by turbulence | |
| Manuela et al. | THE INFLUENCE OF SHELL'S SHAPE IN SHIP DESIGN | |
| Kyungseop et al. | An experimental analysis of vibration-induced noise isolation characteristics of a sonar acoustic sensor | |
| Nechita et al. | The influence OF SHELL’s shape in SHIP design | |
| RU2718182C1 (en) | Vibration damping device of a shaft line vibration-insulated from a ship hull | |
| JPH06144376A (en) | Hull structure provided with vibration damping function | |
| JPH01126578A (en) | Sonar dome | |
| Gangemi et al. | Active control of the accordion modes of a submerged hull | |
| JP2014113927A (en) | Vibration reduction structure of craft |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A821 Effective date: 20170413 |
|
| RD03 | Notification of appointment of power of attorney |
Free format text: JAPANESE INTERMEDIATE CODE: A7423 Effective date: 20181109 |
|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20200110 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20201028 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20201104 |
|
| A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20210104 |
|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20210326 |
|
| A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20210531 |
|
| C60 | Trial request (containing other claim documents, opposition documents) |
Free format text: JAPANESE INTERMEDIATE CODE: C60 Effective date: 20210531 |
|
| A911 | Transfer to examiner for re-examination before appeal (zenchi) |
Free format text: JAPANESE INTERMEDIATE CODE: A911 Effective date: 20210607 |
|
| C21 | Notice of transfer of a case for reconsideration by examiners before appeal proceedings |
Free format text: JAPANESE INTERMEDIATE CODE: C21 Effective date: 20210608 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20210713 |
|
| A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20210913 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20211019 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20211116 |
|
| R150 | Certificate of patent or registration of utility model |
Ref document number: 6979781 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R150 |