JPH03149431A - Device for damping longitudinal vibration of marine propeller shaft - Google Patents
Device for damping longitudinal vibration of marine propeller shaftInfo
- Publication number
- JPH03149431A JPH03149431A JP28837989A JP28837989A JPH03149431A JP H03149431 A JPH03149431 A JP H03149431A JP 28837989 A JP28837989 A JP 28837989A JP 28837989 A JP28837989 A JP 28837989A JP H03149431 A JPH03149431 A JP H03149431A
- Authority
- JP
- Japan
- Prior art keywords
- longitudinal vibration
- vibration
- drive shaft
- longitudinal
- propeller shaft
- 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.)
- Pending
Links
- 238000013016 damping Methods 0.000 title claims description 19
- 238000001514 detection method Methods 0.000 claims description 4
- 230000001360 synchronised effect Effects 0.000 claims description 4
- 230000000694 effects Effects 0.000 description 7
- 125000006850 spacer group Chemical group 0.000 description 4
- 230000001133 acceleration Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000000696 magnetic material Substances 0.000 description 2
- 230000005415 magnetization Effects 0.000 description 2
- 240000008564 Boehmeria nivea Species 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000004308 accommodation Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Landscapes
- Vibration Prevention Devices (AREA)
Abstract
Description
【発明の詳細な説明】
「産業上の利用分野」
本発明は、舶用駆動軸の縦振動減衰装置に関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a longitudinal vibration damping device for a marine drive shaft.
「従来の技術」 第３図は大型船舶の後尾部分の概略を示すものである。"Conventional technology" Figure 3 schematically shows the rear part of a large ship.
該船舶において、原動ａｔの回転力を推進プロペラ２に
伝達するための駆動軸３には、原動機Ｉにクランク部が
存在すること等によって、駆動軸３に軸方向の振動、い
わゆる縦振動が発生し、この縦振動は基本周波数成分の
他に高次周波数成分（高調波成分）を含んで、原動機ｌ
のエンジンルームへの取り付は部分等を経由して、居住
室や甲板等に伝達されるとともに、時には騒音を発生し
、末た、振動の伝達経路における各種構成材の機械的強
度及び疲労強度を低下させる要因となる。In this ship, vibration in the axial direction, so-called longitudinal vibration, occurs in the drive shaft 3 for transmitting the rotational force of the prime mover AT to the propulsion propeller 2 due to the presence of a crank portion in the prime mover I. However, this longitudinal vibration contains high-order frequency components (harmonic components) in addition to the fundamental frequency component, and
When installed in the engine room, the vibration is transmitted to the accommodation room, deck, etc. via parts, etc., and sometimes generates noise, which also causes damage to the mechanical strength and fatigue strength of various components in the vibration transmission path. This is a factor that reduces the
従来、このような縦振動を低減するために、駆動輪３の
船首側の端部を突出させ、第４図に示すように、突出輪
部３ａにオイルダンパ４を取り付けて、突出輪部３ａと
一体のピストン５が、矢印で示すように往復移動させら
れるときに、支持構造物６にピストン５を囲んで支持さ
れるケーシング７に収納されている油８が、連通孔９を
経由して流れることによってエネルギを消費させ、これ
により縦振動を減衰させるようにしている。なお、第４
図において符号ｌＯはシール部である。Conventionally, in order to reduce such longitudinal vibration, the bow end of the drive wheel 3 is made to protrude, and as shown in FIG. 4, an oil damper 4 is attached to the protruding ring part 3a. When the piston 5, which is integrated with the The flow consumes energy, thereby damping longitudinal vibrations. In addition, the fourth
In the figure, the symbol 1O is a seal portion.
「発明が解決しようとする課題」
しかしながら、一般にオイルダンパ４は、急激な変位を
妨げる緩衝機能を持つものであるが、振動の吸収や減衰
効果が少なく、かつ、原動機ｌの回転数によって変化し
たり、振動の周波数成分が複数含まれていると、減衰効
果が著しく低下する傾向がある。したがって、駆動軸３
の縦振動減衰効果を大きくしようとするとオイルダンパ
４が大型で複雑なものとなり易く、かつ、使用中におけ
る油の温度上昇や酸化等の経年変化によって、特性低下
を招く等の課題が残されている。``Problems to be Solved by the Invention'' However, although the oil damper 4 generally has a buffering function that prevents sudden displacement, it has little vibration absorption or damping effect and does not change depending on the rotation speed of the prime mover l. Or, if multiple frequency components of vibration are included, the damping effect tends to decrease significantly. Therefore, drive shaft 3
If an attempt is made to increase the longitudinal vibration damping effect of the oil damper 4, the oil damper 4 tends to be large and complicated, and problems remain, such as deterioration of characteristics due to aging of the oil such as temperature rise and oxidation during use. There is.
本発明は、このような課題を解決するものであり、縦振
動の振動数、振動周波数成分、振動の大きさに自動的に
追従し、かつ、振動減衰効果が高い舶用駆動軸の縦振動
減衰装置の提供を目的としている。The present invention solves these problems and provides longitudinal vibration damping for marine drive shafts that automatically follows the frequency, vibration frequency component, and magnitude of longitudinal vibration and has a high vibration damping effect. The purpose is to provide equipment.
「課題を解決するための手段」
本発明に係る舶用駆動軸の縦振動減衰装置は、推進プロ
ペラの駆動軸に取り付けられ軸方向の振動を検出する縦
振動センサと、該縦振動センサの検出信号を解析し縦振
動波形と同期する電流を発生させる制御部と、該制御部
と前記駆動軸との間に介在し前記軸方向の振動に対して
逆位相の振動を駆動軸に及ぼす電磁ダンパとを具備する
ものである。"Means for Solving the Problems" A longitudinal vibration damping device for a marine drive shaft according to the present invention includes a longitudinal vibration sensor that is attached to the drive shaft of a propulsion propeller and detects vibration in the axial direction, and a detection signal of the longitudinal vibration sensor. a control unit that generates a current that is synchronized with a longitudinal vibration waveform by analyzing the vibration waveform; and an electromagnetic damper that is interposed between the control unit and the drive shaft and applies vibration to the drive shaft that is in an opposite phase to the vibration in the axial direction. It is equipped with the following.
「作用」
駆動軸に伝達された軸方向の振動は、縦振動センサによ
って検出されて、制御部において解析されるとともに、
縦振動波形に対応する電流を生じさせて、電磁ダンパに
よって当初の軸方向の振動と振動方向が逆の関係を有す
る電磁振動を発生させ、振動を相殺させることにより、
当初の軸方向の振動を減衰させるものである。"Operation" The axial vibration transmitted to the drive shaft is detected by the longitudinal vibration sensor, analyzed in the control section, and
By generating a current corresponding to the longitudinal vibration waveform and using an electromagnetic damper to generate electromagnetic vibration whose vibration direction is opposite to the original axial vibration, the vibration is canceled out.
This dampens the initial axial vibration.
「実施例」
以下、第１図及び第２図に基づいて、本発明に係る舶用
駆動軸の縦振動減衰装置の一実施例について説明する。"Embodiment" Hereinafter, an embodiment of the longitudinal vibration damping device for a marine drive shaft according to the present invention will be described based on FIGS. 1 and 2.
これら第１図及び第２図において、符号Ｘは縦振動減衰
装置、１１は縦振動センサ、１２は制御部、１３は電磁
ダンパである。1 and 2, reference numeral X indicates a longitudinal vibration damping device, 11 a longitudinal vibration sensor, 12 a control section, and 13 an electromagnetic damper.
縦振動減衰装置Ｘは、駆動軸３の回りに配設される縦振
動センサ１１の部分、制御部１２を中心とする電気回路
の部分、電磁制動力を駆動軸３に及ぼす電磁ダンパ１３
の部分を具備している。The longitudinal vibration damping device
It has a part.
前記縦振動センサ１１は、第１図に示すように、例えば
、駆動軸３の外周面に取り付けられた永久磁石１４と、
該永久磁石１４の駆動軸３の縦方向移動により生じる磁
気特性の変化を検出コイル１５において電気量の変化と
して検出するものである。As shown in FIG. 1, the longitudinal vibration sensor 11 includes, for example, a permanent magnet 14 attached to the outer peripheral surface of the drive shaft 3;
Changes in the magnetic properties caused by the vertical movement of the drive shaft 3 of the permanent magnet 14 are detected by the detection coil 15 as changes in the amount of electricity.
前記電気回路の部分は、バイパスフィルタ１６と制御部
１２と磁化電流発生部１７とを有しており、縦振動セン
サｉｔの出力信号中に含まれる振動情報のうち、波のう
ねり等に基づく抵抗力の変化によって生じる低周波成分
をバイパスフィルタ１６よって除去し、該バイパスフィ
ルタ！６の出力信号を受けた制御部１２において、縦振
動波形の解析及び演算を行なうとともに、縦振動波形と
同期する電気信号を出力し、該ａｍ部１２の出力信号を
受けた磁化電流発生部１７において、縦振動波形と同期
しかつ必要な大きさの電流を発生させて電磁ダンパ１３
に伝送するものである。The electric circuit section includes a bypass filter 16, a control section 12, and a magnetizing current generation section 17, and among the vibration information included in the output signal of the longitudinal vibration sensor IT, resistance based on wave undulation, etc. Low frequency components caused by changes in force are removed by the bypass filter 16, and the bypass filter ! The control section 12 that receives the output signal from the am section 12 analyzes and calculates the longitudinal vibration waveform, and outputs an electric signal that is synchronized with the longitudinal vibration waveform. , a current of a necessary magnitude is generated in synchronization with the longitudinal vibration waveform to drive the electromagnetic damper 13.
It is intended to be transmitted to
前記電磁ダンパ１３は、回転部分と固定部分とを有し、
回転部分には、駆動軸３に対して溶接等によって一体に
取り付けられるドラム１８と、該ドラム１８に一体に取
り付けられ非磁性体からなる取り付はブラケット１９と
、該取り付はブラケット１９にＮ極及びＳ極を駆動軸３
の軸方向に対して平行にかつ両方向に向けてそれぞれ取
り付けられる多数個の永久磁石２０と、該多数個の永久
磁石２０の間に介在させられるスペーサ２１と、永久磁
石２０及びスペーサ２１の外周に配される押さえスリー
ブ２２とが備えられ、固定部分には、駆動軸３の回りに
適宜配置した支持構造物２３と、該支持構造物２３に一
体に取り付けられた固定ブラケット２４と、該固定ブラ
ケット２４に取り付けられ前述の永久磁石２０に対向状
態に配置される複数個の電磁石２５と、該電磁石２５を
作動させるため前記磁化電流発生部１７に接続されてい
る電磁コイル２５−ａとを備えている。The electromagnetic damper 13 has a rotating part and a fixed part,
The rotating part includes a drum 18 that is integrally attached to the drive shaft 3 by welding or the like, a mounting bracket 19 that is integrally attached to the drum 18 and made of a non-magnetic material, and a mounting bracket 19 that is integrally attached to the drum 18 and made of a non-magnetic material. Pole and S pole to drive shaft 3
A large number of permanent magnets 20 are attached parallel to the axial direction and in both directions, a spacer 21 is interposed between the large number of permanent magnets 20, and the outer periphery of the permanent magnet 20 and the spacer 21 is The fixed part includes a support structure 23 appropriately arranged around the drive shaft 3, a fixation bracket 24 integrally attached to the support structure 23, and a fixation bracket 22 arranged around the drive shaft 3. A plurality of electromagnets 25 are attached to the permanent magnet 24 and arranged to face the permanent magnet 20, and an electromagnetic coil 25-a is connected to the magnetizing current generating section 17 to operate the electromagnets 25. There is.
そして、永久磁石２０は、第２図に示すように、駆動輪
３の回りに多数個がスペーサ２１を介在させた状態で配
され、内外位置における磁極の極性をそろえるよう設定
され、原動機ｌのシリンダ数等の仕様や高次振動も考慮
して、永久磁石２０によって形成される磁場の周方向の
むらを少なくするように、例えば駆動軸一回転あたりの
高次振動数の数倍程度に分割数を多くするように設定す
る。一方の電磁石２５は、少なくとも３個以上とされ、
永久磁石２０の数に対して少なく設定することができる
。なお、第２図において、符号２６は、ボルト・ナツト
等の締結具である。As shown in FIG. 2, a large number of permanent magnets 20 are arranged around the driving wheel 3 with spacers 21 interposed therebetween, and are set so that the polarity of the magnetic poles at the inner and outer positions are aligned. Considering specifications such as the number of cylinders and high-order vibrations, the number of divisions is divided into several times the high-order vibration frequency per rotation of the drive shaft, for example, to reduce unevenness in the circumferential direction of the magnetic field formed by the permanent magnet 20. Set to increase. One electromagnet 25 is at least three or more,
The number can be set smaller than the number of permanent magnets 20. In addition, in FIG. 2, the reference numeral 26 indicates a fastener such as a bolt or nut.
このように構成されている舶用駆動軸の縦振動減衰装置
では、駆動軸３が軸方向の振動を伴うものであると、い
わゆる縦振動が縦振動センサ１１によって検出されて、
信号の有効データ部分が制御部１２に送られることによ
り、制御部１２において解析及び演算がなされて、磁化
電流発生部１７により縦振動波形と同期する磁化電流を
発生させ、これを電磁ダンパ１３における電磁コイル２
５ａに供給することにより、電磁石２５を作動させて縦
振動と相殺する振動を発生させる。In the longitudinal vibration damping device for a marine drive shaft configured as described above, when the drive shaft 3 is accompanied by vibration in the axial direction, the so-called longitudinal vibration is detected by the longitudinal vibration sensor 11.
The valid data portion of the signal is sent to the control unit 12, where it is analyzed and calculated, and the magnetization current generation unit 17 generates a magnetization current that is synchronized with the longitudinal vibration waveform. Electromagnetic coil 2
5a, the electromagnet 25 is activated to generate vibrations that cancel out the longitudinal vibrations.
さらに詳細を説明すると、ある瞬間に駆動軸３が第１図
の右方向に移動するとともに、この移動によって電磁ダ
ンパ１３の永久磁石２５も右方向に移動した場合である
と、この移動が縦振動センサｌｌによって検出されて、
制御部１２を経由して処理することにより、電磁ダンパ
１３の電磁石２５に第１図に（Ｓ）（Ｎ）で示す極性の
磁極が生じて、縦振動を減衰させるように機能する。To explain the details further, if the drive shaft 3 moves to the right in FIG. detected by sensor ll,
By processing via the control unit 12, magnetic poles of polarities shown as (S) and (N) in FIG. 1 are generated in the electromagnet 25 of the electromagnetic damper 13, and function to damp longitudinal vibration.
つまり、第１図の右側部分では、永久磁石２０のＮ極及
びＳ極と電磁石２５の極性が同一になることによる反発
力が生じる一方、第１図の左側部分では、永久磁石２０
のＮ極及びＳ極と電磁石２５の極性が異なることによる
吸引力が生じて、駆動軸３の移動を抑制する力が発生す
る。この場合、駆動軸３の縦振動波形が高次成分を含ん
でいても、縦振動センサ１１において、縦振動の変位量
及び加速度変化を波形化して検出することにより、縦振
動と反対の相似振動を電磁ダンパ１３によって発生させ
て、振動を減衰させる相殺を行なうことができ、第！図
の左側方向への駆動軸３の移動時にも同様に機能し、往
復移動、即ち振動に対して減衰させる相殺方向に相似振
動を発生させる。この場合の相殺の程度は、磁化電流発
生部１７からの供給電流の大きさ及びその波形によって
設定することができる。That is, in the right part of FIG. 1, a repulsive force occurs because the N and S poles of the permanent magnet 20 and the electromagnet 25 have the same polarity, while in the left part of FIG.
An attractive force is generated due to the polarity of the electromagnet 25 being different from the N and S poles of the electromagnet 25, and a force that suppresses the movement of the drive shaft 3 is generated. In this case, even if the longitudinal vibration waveform of the drive shaft 3 includes high-order components, the longitudinal vibration sensor 11 detects a similar vibration opposite to the longitudinal vibration by converting the displacement amount and acceleration change of the longitudinal vibration into waveforms and detecting them. can be generated by the electromagnetic damper 13 to attenuate and offset the vibration. It functions similarly when the drive shaft 3 moves to the left in the figure, and generates similar vibrations in the direction of canceling the reciprocating movement, that is, damping the vibrations. The degree of cancellation in this case can be set by the magnitude and waveform of the current supplied from the magnetizing current generator 17.
しかして、駆動軸３が縦振動を伴う場合は、その振動方
向と反対でかつ振動波形が相似する振動を駆動軸３に付
与して、駆動軸３の縦振動を減衰させようとする制御が
行なわれる。Therefore, when the drive shaft 3 is accompanied by longitudinal vibration, control is performed to attenuate the longitudinal vibration of the drive shaft 3 by applying vibration to the drive shaft 3 that is opposite to the vibration direction and has a similar vibration waveform. It is done.
［他の実施ａ様］
なお、本発明にあっては、次のような実施態様を採用す
ることができる。[Other Embodiments a] In the present invention, the following embodiments can be adopted.
（イ）縦振動センサ１１を加速度センサや歪みセンサ等
に置き換えること。(a) Replacing the longitudinal vibration sensor 11 with an acceleration sensor, strain sensor, or the like.
（ロ）縦振動センサ１１から電磁ダンパ１３までの信号
及びデータの処理をアナログ／デジタル変換またはデジ
タル／アナログ変換して行なうこと。(b) Processing the signals and data from the longitudinal vibration sensor 11 to the electromagnetic damper 13 by performing analog/digital conversion or digital/analog conversion.
（ハ）振動の相殺量を数１０％とすること、また、振動
の基本周波数等の特定周波数成分を主として減衰させる
こと。(c) The amount of vibration cancellation should be several tens of percent, and specific frequency components such as the fundamental frequency of vibration should be mainly attenuated.
（ニ）オイルダンパ等の振動抑制手段と併用すること。(d) Use in combination with vibration suppression means such as oil dampers.
（ホ）電磁石２５の数を永久磁石２０と同様に多数とす
ること。(e) The number of electromagnets 25 should be as large as the number of permanent magnets 20.
「発明の効果」
以上説明したように、本発明に係る舶用駆動軸の縦振動
減衰装置は、次のような優れた効果を奏するものである
。"Effects of the Invention" As explained above, the longitudinal vibration damping device for a marine drive shaft according to the present invention has the following excellent effects.
■駆動軸の縦振動を検出して、電磁ダンパによって反対
位相の振動を発生させ、縦振動と相殺するようにしてい
るので、振動数に関係なく縦振動の減衰を効果的に行な
うことができる。■The longitudinal vibration of the drive shaft is detected and an electromagnetic damper generates vibration of the opposite phase to cancel out the longitudinal vibration, so longitudinal vibration can be effectively damped regardless of the frequency. .
■縦振動をその振動波形を勘案して相殺するものである
ために、高次振動が含まれている場合の減衰効果が高く
、縦振動に基づく不具合現象の発生を防止することがで
きる。(2) Since longitudinal vibrations are canceled by taking into consideration the vibration waveform, the damping effect is high when higher-order vibrations are included, and it is possible to prevent the occurrence of malfunctions due to longitudinal vibrations.
■駆動軸の途中に設置することにより、従来例のオイル
ダンパと比較して機関室の長さを短縮することができる
。■By installing it midway along the drive shaft, the length of the engine room can be shortened compared to conventional oil dampers.
第１図は本発明に係る舶用駆動軸の縦振動減衰装置の一
実施例を示すブロック図を併記した縦断面図、、第２図
は第１図のト」線矢視図、第３図は大型船舶の後尾部分
の概略を示す側面図、第４図はオイルダンパの従来例を
示す縦断面図である。
Ｘ・・・−・・縦振動減衰装置、
！・・・・・・原動機、
２・・・・・・推進プロペラ、
３・・・・・・駆動軸、
３ａ・・・・・・突出輪部、
１１・・・・・・縦振動センサ、
１２・−・・・・ｔｓｍ部、
１３・・・・・−電磁ダンバ、
１４・・・・・・永久磁石、
１５・・・・・・検出コイル、
１６・・・・・・ハイパスフィルタ、
１７・−・・・磁化電流発生部、
１８・・・・・・ドラム、
１Ｆ・・・・・取り付はブラケット、
２０・・・・・・永久磁石、
２１・・・・・・スペーサ、
２２・・・・・・押さえスリーブ、
２３・・・・・・支持構造物、
２４・・・・・・固定ブラケット、
２５・・・・・・電磁石、
２５ａ・・・・・・電磁コイル、
２６・・・・・・締結具。
出願人 石川島播磨重工業株式会社
第１図
２ 苧 １
「
１９ 旧
第３図
１ １１目 Ｉ1 is a vertical sectional view with a block diagram showing an embodiment of the longitudinal vibration damping device for a marine drive shaft according to the present invention, FIG. 2 is a view taken along the line T in FIG. 1, and FIG. 4 is a side view schematically showing the rear portion of a large ship, and FIG. 4 is a longitudinal sectional view showing a conventional example of an oil damper. X...---Longitudinal vibration damping device, ! .... Prime mover, 2 .... Propulsion propeller, 3 .... Drive shaft, 3a .... Protruding ring part, 11 ..... Longitudinal vibration sensor, 12...TSM section, 13...-Electromagnetic damper, 14...Permanent magnet, 15...Detection coil, 16...High-pass filter, 17... Magnetizing current generator, 18... Drum, 1F... Mounting bracket, 20... Permanent magnet, 21... Spacer, 22... Holding sleeve, 23... Support structure, 24... Fixed bracket, 25... Electromagnet, 25a... Electromagnetic coil, 26... Fastener. Applicant Ishikawajima Harima Heavy Industries Co., Ltd. Figure 1 2 Ramie 1 "19 Former Figure 3 1 Item 11 I
Claims (1)
出する縦振動センサと、該縦振動センサの検出信号を解
析し縦振動波形と同期する電流を発生させる制御部と、
該制御部と前記駆動軸との間に介在し前記軸方向の振動
に対して逆位相の振動を駆動軸に及ぼす電磁ダンパとを
具備することを特徴とする舶用駆動軸の縦振動減衰装置
。a longitudinal vibration sensor that is attached to the drive shaft of the propulsion propeller and detects vibration in the axial direction; a control unit that analyzes the detection signal of the longitudinal vibration sensor and generates a current that is synchronized with the longitudinal vibration waveform;
A longitudinal vibration damping device for a marine drive shaft, comprising: an electromagnetic damper that is interposed between the control section and the drive shaft and applies vibration to the drive shaft in a phase opposite to the vibration in the axial direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28837989A JPH03149431A (en) | 1989-11-06 | 1989-11-06 | Device for damping longitudinal vibration of marine propeller shaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28837989A JPH03149431A (en) | 1989-11-06 | 1989-11-06 | Device for damping longitudinal vibration of marine propeller shaft |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03149431A true JPH03149431A (en) | 1991-06-26 |
Family
ID=17729439
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28837989A Pending JPH03149431A (en) | 1989-11-06 | 1989-11-06 | Device for damping longitudinal vibration of marine propeller shaft |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03149431A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5921149A (en) * | 1994-02-28 | 1999-07-13 | Isad Electronic Systems Gmbh & Co. Kg | System and process for active vibration damping |
| GB2490358A (en) * | 2011-04-28 | 2012-10-31 | Relgold Ltd | Display with concave faces formed from foldable blank with reinforcing strut panels |
| US10953968B2 (en) | 2016-06-28 | 2021-03-23 | Abb Schweiz Ag | Control of propeller shaft movement |
| CN114802671A (en) * | 2022-04-28 | 2022-07-29 | 武汉理工大学 | Axial vibration reduction device and system for shaftless rim propeller |
-
1989
- 1989-11-06 JP JP28837989A patent/JPH03149431A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5921149A (en) * | 1994-02-28 | 1999-07-13 | Isad Electronic Systems Gmbh & Co. Kg | System and process for active vibration damping |
| GB2490358A (en) * | 2011-04-28 | 2012-10-31 | Relgold Ltd | Display with concave faces formed from foldable blank with reinforcing strut panels |
| US10953968B2 (en) | 2016-06-28 | 2021-03-23 | Abb Schweiz Ag | Control of propeller shaft movement |
| EP3475163B1 (en) * | 2016-06-28 | 2022-03-23 | ABB Schweiz AG | Control of propeller shaft movement |
| CN114802671A (en) * | 2022-04-28 | 2022-07-29 | 武汉理工大学 | Axial vibration reduction device and system for shaftless rim propeller |
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