JP2832144B2 - Adjustment method of passive vibration suppression device - Google Patents
Adjustment method of passive vibration suppression deviceInfo
- Publication number
- JP2832144B2 JP2832144B2 JP621494A JP621494A JP2832144B2 JP 2832144 B2 JP2832144 B2 JP 2832144B2 JP 621494 A JP621494 A JP 621494A JP 621494 A JP621494 A JP 621494A JP 2832144 B2 JP2832144 B2 JP 2832144B2
- Authority
- JP
- Japan
- Prior art keywords
- building
- vibration damping
- damping device
- vibration
- natural frequency
- 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.)
- Expired - Fee Related
Links
Landscapes
- Vibration Prevention Devices (AREA)
- Buildings Adapted To Withstand Abnormal External Influences (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、流体式制振装置などの
パッシブ制振装置を建物の実際の固有周期に同調させる
ための調整方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adjustment method for tuning a passive vibration damping device such as a fluid vibration damping device to an actual natural period of a building.
【０００２】[0002]
【従来の技術】流体式制振装置は断面凹形タンク内に水
を収納したもので、建物の屋上などに設置され、建物の
振動によりタンク内の水が移動し、建物振動の周期に対
して時間遅れでタンクの内壁に水が衝突するエネルギー
により振動を相殺するものであり、振り子式制振装置な
どに比べて外見上可動部分がないことや、水は非常時の
飲料水として利用することができる利点がある。2. Description of the Related Art A fluid type vibration damping device is a device in which water is stored in a tank having a concave cross section, and is installed on a roof of a building or the like, and the water in the tank moves due to the vibration of the building. The vibration is offset by the energy of water colliding with the inner wall of the tank with a time delay.There is no apparently movable part compared to pendulum type vibration dampers, etc., and water is used as drinking water in an emergency. There are advantages that can be.
【０００３】ところで、この種の制振装置をパツシブタ
イブまたはパッシブタイプに駆動装置を加えたハイブリ
ッドタイプにして、建物の振動を防止しようとする場
合、建物の固有周期と制振装置の固有振動数を一致させ
る必要があり、実用に当たって建物の固有周期は主体構
造の計算によって概略の値を算出し、それに応じて流体
式制振装置の固有振動数も設計されるもので設計振動数
に応じてタンク寸法や容量、収納される水量などが計算
され、その設計のものが屋上またはその近傍などに据え
付けられる。By the way, when this type of vibration damping device is a passive type or a hybrid type in which a driving device is added to a passive type to prevent the vibration of a building, the natural period of the building and the natural frequency of the vibration damping device are determined. In practical use, the natural period of the building must be roughly calculated by calculating the main structure, and the natural frequency of the fluid-type vibration damping device is designed accordingly. The dimensions and capacity, the amount of water to be stored, and the like are calculated, and the design is installed on the roof or in the vicinity thereof.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、厳密に
は建物完成時でないと実際の固有周期を決めることは出
来ない。つまり、内装工事や、設計変更、模様替えなど
に応じて建物重量は増加方向に変化するため、実際の建
物固有周期はその都度微妙に変化する。また、完成後で
あっても重量やその配分などの変化に応じて固有周期は
変化する。However, strictly speaking, the actual natural period cannot be determined unless the building is completed. That is, the weight of the building changes in the increasing direction according to the interior work, the design change, the pattern change, and the like, so that the actual natural period of the building slightly changes each time. Also, even after completion, the natural period changes according to changes in weight, distribution, and the like.
【０００５】したがって、当初設計に応じて作られた制
振装置ではその固有振動数が建物自体のそれに完全に同
調せず、当初から制振効果が低減したり、或いはその後
の重量配分の変化などによって制振効果が順次低減する
場合もある。[0005] Therefore, in a vibration damping device made according to the initial design, its natural frequency is not completely synchronized with that of the building itself, and the vibration damping effect is reduced from the beginning, or the weight distribution changes after that. In some cases, the damping effect is sequentially reduced.
【０００６】また、このような点の解決のためにある程
度この種の変化を見越した設計をし、水量や内部圧力を
加減することも考えられるが、このような場合には調節
作業自体が面倒で大掛かりなものとなる欠点が生ずる。In order to solve such a problem, it is conceivable to design the device to allow for this kind of change to some extent and to adjust the amount of water and the internal pressure. However, in such a case, the adjustment operation itself is troublesome. This causes a large-scale disadvantage.
【０００７】本発明は以上の問題を解決するものであっ
て、その目的は建物の実際の固有周期に応じた制振装置
の固有振動数の微調整作業を簡単、かつ迅速に行えるよ
うにしたパッシブ制振装置の調整方法を提供するもので
ある。SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to make it possible to easily and quickly fine-tune the natural frequency of a vibration damping device according to the actual natural period of a building. An object of the present invention is to provide a method of adjusting a passive vibration damping device.
【０００８】[0008]
【課題を解決するための手段】前記目的を達成するた
め、請求項１にかかる発明は、建物の上部に設置される
下部タンクの両側上部にこれと連通する一対の立ち上げ
部を立設した断面凹状の貯留タンクと、前記各立ち上げ
部の上方空間同士を連通するダクトを介して連通する中
間貯留部と、前記貯留タンク及び中間貯留部の内部に上
部に空間を設けて収容された制振用の液体と、前記中間
貯留部内に回動可能に配置され前記液体を二つに仕切る
回転板を備え、前記建物の設計固有周期に応じた固有振
動数に設定されたパッシブ制振装置において、該制振装
置は前記回転板の回転軸に連結される固有振動数の外部
調節手段を備え、振動測定器により測定される前記建物
の実際の固有周期に応じて前記外部調節手段を調整して
該制振装置の固有振動数を前記建物の実固有周期に同調
させることを特徴とするものである。In order to achieve the above object, the invention according to claim 1 has a pair of rising portions communicating with the lower tank installed on the upper side of the lower tank installed on the upper part of the building. A storage tank having a concave cross-section, an intermediate storage portion communicating through a duct communicating the spaces above the rising portions, and a space provided with an upper space provided inside the storage tank and the intermediate storage portion. In the passive vibration damping device, comprising: a shaking liquid; a rotating plate rotatably arranged in the intermediate storage section to partition the liquid into two; and a natural frequency set in accordance with a design natural cycle of the building. Wherein the vibration damping device comprises external adjusting means for the natural frequency connected to the rotation axis of the rotating plate, and adjusts the external adjusting means according to the actual natural period of the building measured by a vibration measuring device. Of the vibration suppression device It is characterized in that tuning the number to the actual natural period of the building.
【０００９】また、請求項２にかかる発明は、建物の上
部に設置されるパッシブ制振装置において、前記建物の
完成前には設計固有周期に応じた固有振動数に設定し、
建物完成後に、前記建物の上部に設けた振動測定装置か
ら得られる振動周期に一致するよう前記制振装置の固有
振動数を調整することを特徴とするものである。According to a second aspect of the present invention, in the passive vibration damping device installed above a building, a natural frequency according to a design natural period is set before the completion of the building.
After completion of the building, the natural frequency of the vibration damping device is adjusted to match the vibration period obtained from the vibration measuring device provided at the top of the building.
【００１０】[0010]
【作用】以上の調整方法によれば、測定結果に合わせて
外部調節手段の調整作業のみにより制振装置の固有振動
数をその時点における建物の固有周期に同調させること
ができる。According to the above adjustment method, the natural frequency of the vibration damping device can be tuned to the natural period of the building at that time only by adjusting the external adjusting means in accordance with the measurement result.
【００１１】[0011]
【実施例】以下本発明の一実施例を図面を用いて詳細に
説明する。図１はこの発明方法を適用したパッシブ制振
装置を示すものである。図における制振装置は、建物Ｔ
の屋上などに設置されるものであり、貯留タンク１と、
貯留タンク１の中間位置の上部に配置された中間貯留部
２とを備えている。DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a passive vibration damping device to which the method of the present invention is applied. In the figure, the building T
The storage tank 1
And an intermediate storage section 2 disposed above an intermediate position of the storage tank 1.
【００１２】貯留タンク１は、下部タンク３の両側上部
にこれと連通した一対の立ち上げ部４を立設した断面凹
状のもので、内部に制振用の水５を収容し、立ち上げ部
４の中間程度まで満たしたものである。The storage tank 1 has a concave cross section in which a pair of rising portions 4 communicating with the lower tank 3 are provided on upper sides on both sides thereof. The storage tank 1 stores water 5 for vibration damping therein. It was filled up to the middle of 4.
【００１３】そして、この各立ち上げ部４の上方空間同
士を連通するダクト６を設け、このダクトを前記中間貯
留部２の上部両側に接続している。A duct 6 is provided for communicating the spaces above the rising sections 4 with each other. The duct 6 is connected to both upper sides of the intermediate storage section 2.
【００１４】前記中間貯留部２は下部半円形をしたもの
であり、その内部中央の垂れ壁状の仕切り板５ａによっ
てＵ字型に形成した内部空間に水５を仕切り板の下端よ
り上まで満たし、また細管７を介して貯留タンク１に連
通し、水位を同一に保持している。The intermediate storage section 2 has a lower semicircular shape, and fills an inner space formed in a U-shape by a hanging wall-shaped partition plate 5a at the center of the inside with water 5 above the lower end of the partition plate. In addition, it communicates with the storage tank 1 through the thin tube 7 to maintain the same water level.
【００１５】この中間貯留部２内には水５の流動を受け
て回動変位する回転板８が垂直に配置され、この回転板
８の回転軸９はコイルバネ１０に連繋し、このコイルバ
ネ１０のバネ定数に応じて回転板８の回動抵抗を設定し
ている。A rotary plate 8 that rotates and receives the flow of water 5 is vertically disposed in the intermediate storage section 2, and a rotary shaft 9 of the rotary plate 8 is connected to a coil spring 10. The turning resistance of the rotating plate 8 is set according to the spring constant.
【００１６】前記回転軸９は図２，３に示すように中間
貯留部２の両側部に水密軸受１１を介して回動可能に軸
受され、回転軸９の突出端にはこれと直交してボルト軸
１２が鉛直方向に一体に垂設されている。As shown in FIGS. 2 and 3, the rotating shaft 9 is rotatably supported on both sides of the intermediate storage section 2 via watertight bearings 11, and the projecting end of the rotating shaft 9 is perpendicular to the rotating shaft. The bolt shaft 12 is vertically suspended integrally in the vertical direction.
【００１７】このボルト軸１２には回転慣性モーメント
および復元力、すなわち固有振動数の外部調整手段とし
ての回動抵抗調整用の重り１４が螺合され、その軸方向
に沿って移動調整可能としている。また、１５は重り１
４の上下に配置された回転止め用のナットである。A weight 14 for turning resistance adjustment as external adjustment means for the rotational inertia moment and the restoring force, that is, the natural frequency, is screwed to the bolt shaft 12, and can be moved and adjusted along the axial direction. . 15 is weight 1
4 are nuts for rotation prevention arranged above and below the nut 4.
【００１８】なお、下部タンク３の上部は図と直交する
方向も同じ一対の立ち上げ部４、ダクト６、中間貯留部
２が配置され、これにより水平２方向の振動に対処して
制振動作を行う。The upper portion of the lower tank 3 is provided with a pair of rising portions 4, a duct 6, and an intermediate storage portion 2 which are also arranged in the same direction perpendicular to the figure, thereby suppressing vibrations in two horizontal directions. I do.
【００１９】この構造のパッシブ制振装置にあっては、
貯留タンク１内の水５の動きと中間貯留水の動きを同一
方向にするように図１のダクト６にかえて点線で示すダ
クト６´をつなぐことにより、より小型で大きな制振効
果を得ることができる。In the passive vibration damping device having this structure,
By connecting the duct 6 'shown by a dotted line in place of the duct 6 in FIG. 1 so that the movement of the water 5 in the storage tank 1 and the movement of the intermediate stored water are in the same direction, a smaller and larger vibration damping effect is obtained. be able to.
【００２０】次に以上のパッシブ制振装置を用いた調整
方法を説明する。Next, an adjustment method using the above passive damping device will be described.
【００２１】まず、静止状態では前記回転板８は中立位
置にあり、水位も同一に保たれている。First, in the stationary state, the rotary plate 8 is at the neutral position, and the water level is kept the same.
【００２２】この状態から振動が生ずることで水４が貯
留タンク１及び中間貯留部２内を移動し、また、空気も
移動して中間貯留部２内を圧する。これにより回転板８
をその移動方向に圧し、回転板８は回動する。このとき
の中間貯留部２の振動数は前記コイルバネ１０のバネ定
数に加え、前記重り１４の位置に応じた回転軸まわりの
回転慣性モーメント及び復元力により決まり、制振装置
全体の振動数も調整される。When vibration is generated from this state, the water 4 moves in the storage tank 1 and the intermediate storage section 2, and also the air moves to pressurize the intermediate storage section 2. Thereby, the rotating plate 8
Is pressed in the moving direction, and the rotating plate 8 rotates. At this time, the frequency of the intermediate storage unit 2 is determined by the rotational inertia moment around the rotation axis and the restoring force according to the position of the weight 14, in addition to the spring constant of the coil spring 10, and the frequency of the entire vibration damping device is also adjusted. Is done.
【００２３】すなわち、ボルト軸１２に対する重り１４
の重量の固定位置に応じて前記回転軸９に回転モーメン
トが生じ、これが回転板８に対する回動抵抗としてコイ
ルバネ１０による抵抗値に加算され、重り１４が回転軸
９に近い位置に固定されている場合では、その回転モー
メントは小さく、回転板８の回動抵抗は小さくなり、そ
の逆に回転軸９から遠い位置に固定されている場合には
回転モーメントが大きくなり、回転板８の回動抵抗は大
きくなる。そしてこの回動抵抗に応じて固有振動数が変
化する。That is, the weight 14 with respect to the bolt shaft 12
The rotation moment is generated on the rotating shaft 9 according to the fixed position of the weight, and this is added to the resistance value of the coil spring 10 as the rotating resistance to the rotating plate 8, and the weight 14 is fixed at a position close to the rotating shaft 9. In this case, the rotational moment is small, and the rotational resistance of the rotary plate 8 is small. Conversely, when the rotary plate 8 is fixed at a position far from the rotary shaft 9, the rotational moment is large, and the rotational resistance of the rotary plate 8 is large. Becomes larger. The natural frequency changes according to the rotation resistance.
【００２４】それゆえ、最初は重り１４を付ない状態に
おける建物Ｔの全体の振動を図示しない振動測定器によ
って測定する。なお、測定器は地震等の大きな揺れが生
じなくとも風などのわずかな振動（常時微動）でも測定
でき、その測定された周期が建物全体の周期に等しいの
で、常時周期を測定できる。Therefore, at first, the whole vibration of the building T without the weight 14 is measured by a vibration measuring device (not shown). Note that the measuring device can measure even a slight vibration (always microtremor) such as a wind even if a large shaking such as an earthquake does not occur. Since the measured cycle is equal to the cycle of the entire building, the measuring apparatus can always measure the cycle.
【００２５】次いで重り１４をボルト軸１２の最も回転
軸９に近い位置に固定した状態でボルト軸１２を手動で
自由振動させて再度振動周期を測定し、順次移動しなが
ら測定を繰返すことによって回転板７の回動を建物の固
有周期と同調させ、そのときの建物の上部に設置した振
動計に表示される振幅が最低値であることを確認し、そ
の位置においてナット１５を締め付ければ、微調整作業
が完了することになる。Next, while the weight 14 is fixed at the position closest to the rotating shaft 9 of the bolt shaft 12, the bolt shaft 12 is manually freely vibrated to measure the vibration period again, and the measurement is repeated while sequentially moving, thereby rotating the bolt shaft 12. Synchronizing the rotation of the plate 7 with the natural period of the building, confirming that the amplitude displayed on the vibrometer installed at the top of the building at that time is the minimum value, and tightening the nut 15 at that position, The fine adjustment work is completed.
【００２６】また、ボルト軸１２の長さでは調整範囲を
越える場合には、重り１４を重量の異るものと交換し、
再度測定しつつ移動調整を行えば、最適な値を得ること
になる。If the length of the bolt shaft 12 exceeds the adjustment range, the weight 14 is replaced with a different weight.
If the movement is adjusted while measuring again, an optimum value will be obtained.
【００２７】なお、前記実施例ではボルト軸１２を回転
板８と同様に回転軸９に対して垂下状態に配置してお
り、この場合には重り１４が回転軸９から遠ざかるにつ
れ、回転板８の回動抵抗はコイルバネ１０のバネ定数に
加算されることになるが、ボルト軸１２を回転軸９に対
して立設状態に配置することにより、回転板８の回動抵
抗は前記とは逆にコイルバネ１０のバネ定数から減算さ
れることになり、必要に応じていずれかを選択できる。In the above embodiment, the bolt shaft 12 is disposed so as to hang down from the rotating shaft 9 like the rotating plate 8. In this case, as the weight 14 moves away from the rotating shaft 9, the rotating plate 8 Is added to the spring constant of the coil spring 10, but by arranging the bolt shaft 12 upright with respect to the rotating shaft 9, the rotating resistance of the rotating plate 8 is opposite to that described above. Is subtracted from the spring constant of the coil spring 10, and either one can be selected as needed.
【００２８】また、実施例ではコイルバネをメインと
し、重りを調整用として用いたが、前記実施例では重り
のみとして用いることができる。In the embodiment, the coil spring is used as the main body, and the weight is used for adjustment. However, in the embodiment, the weight can be used only as the weight.
【００２９】[0029]
【発明の効果】以上実施例によって詳細に説明したよう
に、本発明にかかるパッシブ制振装置の調整方法におい
ては、建物完成後に建物の上部に設けた振動測定器の振
動周期に合わせるため、従来に比べて建物の振幅をより
小さくすることができる。さらに、本発明にかかるパッ
シブ制振装置の調整方法にあっては、測定結果に合わせ
て外部調節手段の調整作業のみにより制振装置の固有振
動数をその時点における建物の固有周期に同調させるこ
とができるため、従来に比べて建物固有周期に応じた制
振装置の振動数の微調整作業を簡単、かつ迅速に行うこ
とができる。また固有周期の変動などにもただちに対処
できる利点がある。As described in detail in the above embodiments, in the method for adjusting the passive vibration damping device according to the present invention, since the vibration period of the vibration measuring device provided on the upper part of the building after completion of the building is matched, The amplitude of the building can be made smaller as compared with. Further, in the method for adjusting the passive vibration damping device according to the present invention, the natural frequency of the vibration damping device is tuned to the natural period of the building at that time only by adjusting the external adjusting means in accordance with the measurement result. Therefore, the fine adjustment operation of the vibration frequency of the vibration damping device according to the natural period of the building can be performed easily and quickly as compared with the related art. In addition, there is an advantage that a fluctuation of the natural period can be dealt with immediately.
【図１】本発明方法を適用したパッシブ制振装置の全体
構成を示す断面図である。FIG. 1 is a cross-sectional view showing an overall configuration of a passive vibration damping device to which the method of the present invention is applied.
【図２】同要部側面図である。FIG. 2 is a side view of the main part.
【図３】図２のＡ−Ａ線断面図である。FIG. 3 is a sectional view taken along line AA of FIG. 2;
１ 貯留タンク ２ 中間貯留部 ３ 下部タンク ４ 立ち上げ部 ５ 制振用の液体（水） ６ ダクト ８ 回転板 ９ 回転軸 １２ ボルト軸 １４ 重り（外部調整手段） Ｔ 建物 DESCRIPTION OF SYMBOLS 1 Storage tank 2 Intermediate storage part 3 Lower tank 4 Start-up part 5 Liquid (water) for vibration suppression 6 Duct 8 Rotating plate 9 Rotating shaft 12 Bolt shaft 14 Weight (external adjustment means) T Building
───────────────────────────────────────────────────── フロントページの続き (72)発明者 寺村 彰 東京都清瀬市下清戸４丁目640番地 株 式会社大林組技術研究所内 (58)調査した分野(Int.Cl.6，ＤＢ名) E04H 9/02──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Akira Teramura 4-640 Shimoseito, Kiyose-shi, Tokyo Inside Obayashi Corporation Technical Research Institute Co., Ltd. (58) Field surveyed (Int.Cl. 6 , DB name) E04H 9/02
Claims (2)
側上部にこれと連通する一対の立ち上げ部を立設した断
面凹状の貯留タンクと、前記各立ち上げ部の上方空間同
士を連通するダクトを介して連通する中間貯留部と、前
記貯留タンク及び中間貯留部の内部に上部に空間を設け
て収容された制振用の液体と、前記中間貯留部内に回動
可能に配置されて前記液体を二つに仕切る回転板を備
え、前記建物の設計固有周期に応じた固有振動数に設定
されたパッシブ制振装置において、 該制振装置は前記回転板の回転軸に連結される固有振動
数の外部調節手段を備え、振動測定器により測定される
前記建物の実際の固有周期に応じて前記外部調節手段を
調整して該制振装置の固有振動数を前記建物の実固有周
期に同調させることを特徴とするパッシブ制振装置の調
整方法。1. A storage tank having a concave cross-section in which a pair of rising portions communicating with the lower tank installed on an upper portion on both sides of a lower tank installed in an upper portion of a building, and upper spaces of the rising portions communicate with each other. An intermediate storage unit communicating through a duct, a liquid for vibration damping provided with a space provided in an upper part of the storage tank and the intermediate storage unit, and a rotatably disposed inside the intermediate storage unit; A passive vibration damping device comprising a rotating plate for partitioning a liquid into two, and set to a natural frequency corresponding to a design natural period of the building, wherein the vibration damping device is connected to a rotating shaft of the rotating plate. Number of external adjusting means, and adjusting the external adjusting means according to the actual natural period of the building measured by a vibration measuring instrument to tune the natural frequency of the vibration damping device to the actual natural period of the building. Passive characterized by Adjusting method of the vibration damping device.
置において、前記建物の完成前には設計固有周期に応じ
た固有振動数に設定し、建物の完成後に、前記建物の上
部に設けた振動測定装置から得られる振動周期に一致す
るよう前記制振装置の固有振動数を調整することを特徴
とするパッシブ制振装置の調整方法。2. A passive vibration damping device installed at an upper part of a building, wherein the natural frequency is set to a natural frequency according to a design natural period before the building is completed, and provided at an upper part of the building after the building is completed. A method of adjusting a passive vibration damping device, comprising adjusting a natural frequency of the vibration damping device so as to match a vibration cycle obtained from a vibration measuring device.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP621494A JP2832144B2 (en) | 1994-01-25 | 1994-01-25 | Adjustment method of passive vibration suppression device |
| US08/297,886 US5542220A (en) | 1993-11-30 | 1994-08-30 | Hydrostatic anti-vibration system and adjusting method therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP621494A JP2832144B2 (en) | 1994-01-25 | 1994-01-25 | Adjustment method of passive vibration suppression device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07207987A JPH07207987A (en) | 1995-08-08 |
| JP2832144B2 true JP2832144B2 (en) | 1998-12-02 |
Family
ID=11632279
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP621494A Expired - Fee Related JP2832144B2 (en) | 1993-11-30 | 1994-01-25 | Adjustment method of passive vibration suppression device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2832144B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100452215B1 (en) * | 2002-08-28 | 2004-10-08 | 현대자동차주식회사 | Shimmy reduction apparatus of steering column for vehicles |
| JP2007127210A (en) * | 2005-11-04 | 2007-05-24 | Hitachi Zosen Corp | Cylinderical damping device and structure body |
| ES2320620B1 (en) * | 2009-02-16 | 2010-01-11 | Equipamientos Y Materiales Deportivos, S.L. | VIBRATION SHOCK ABSORBER DEVICE FOR BASKETBALL BASKETS AND A BASKETBALL BASKET. |
| EP4151881A4 (en) * | 2020-05-12 | 2024-07-03 | Nok Corp | Vibration damper, vibration damping apparatus, mounting method of vibration damper, and vibration damping method |
| CN113463963B (en) * | 2021-07-14 | 2022-05-13 | 同济大学 | Yoke type inerter device with adjustable turning radius |
-
1994
- 1994-01-25 JP JP621494A patent/JP2832144B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07207987A (en) | 1995-08-08 |
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