JPH02186072A - Vibration-suppressing device for structure body - Google Patents
Vibration-suppressing device for structure bodyInfo
- Publication number
- JPH02186072A JPH02186072A JP578389A JP578389A JPH02186072A JP H02186072 A JPH02186072 A JP H02186072A JP 578389 A JP578389 A JP 578389A JP 578389 A JP578389 A JP 578389A JP H02186072 A JPH02186072 A JP H02186072A
- Authority
- JP
- Japan
- Prior art keywords
- container
- electromagnetic coil
- magnetic fluid
- vibration
- gravity
- 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.)
- Granted
Links
- 239000011553 magnetic fluid Substances 0.000 claims abstract description 29
- 230000005484 gravity Effects 0.000 claims abstract description 19
- 238000013016 damping Methods 0.000 claims description 15
- 230000004043 responsiveness Effects 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 5
- 239000006249 magnetic particle Substances 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000003679 aging effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000005281 excited state Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Landscapes
- Buildings Adapted To Withstand Abnormal External Influences (AREA)
Abstract
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は構造物の振動を低減する制振装置に関する。[Detailed description of the invention] (Industrial application field) The present invention relates to a vibration damping device for reducing vibrations of a structure.
（従来の技術）
従来、地震や風荷重等による外力から建築物等の構造物
の振動を低減する制振装置としては、（ａ）構造物の最
上部に振り子の作用をする装置（これは構造物と同一の
固有振動数を有する）を設置し、構造物に伝わる振動を
振り子の運動エネルギに変換することで構造物の振動を
低減する振り子方式のもの、
（ｂ）構造物の上部に水を封入した容器（これは構造物
と同一の固有周期を有する）を設置し、構造物に伝わる
振動を、外力と位相を逆にして容器内の水の運動エネル
ギに変換し構造物の振動を低減するスロッシング方式の
もの、
（ｃ）構造物の天井に取り付けた金属プレートと、構造
物の床面から独立に立ち上がる壁の上端に取り付けた金
属プレートとを擦り合わせることによって、振動を摩擦
エネルギに変換し、これにより構造物の振動を低減させ
る摩擦ダンパ方式のものが知られている。(Prior Art) Conventionally, vibration damping devices that reduce vibrations of structures such as buildings due to external forces such as earthquakes and wind loads have been used as (a) devices that act like a pendulum on the top of the structure (this is (b) A pendulum-type device that reduces the vibration of the structure by installing a pendulum (having the same natural frequency as the structure) and converting the vibration transmitted to the structure into kinetic energy of the pendulum. A container filled with water (which has the same natural period as the structure) is installed, and the vibrations transmitted to the structure are converted into kinetic energy of the water in the container by reversing the phase of the external force and causing the structure to vibrate. (c) A metal plate attached to the ceiling of a structure and a metal plate attached to the top of a wall that stands up independently from the floor of the structure are rubbed against each other to reduce vibrations by converting them into frictional energy. A friction damper type is known, which reduces the vibration of a structure by converting it into a structure.
（発明が解決しようとする課題）
しかしながら、上述のような従来の制振装置は何れも機
械方式で制振する構成であるため、外部からの振動に対
して応答性が遅い問題がある。(Problems to be Solved by the Invention) However, since all of the conventional vibration damping devices as described above have a structure in which vibration is damped using a mechanical method, there is a problem in that the response to external vibrations is slow.
また、振り子方式及びスロッシング方式の制振装置では
、装置自体が重量化し、構造物に対する構造上の負担が
大きくなる問題がある。Further, in the pendulum type and sloshing type vibration damping devices, there is a problem that the device itself becomes heavy and the structural load on the structure increases.
また、摩擦ダンパ方式では、金属プレートの静止摩擦係
数と動摩擦係数との違いによって作動時に衝撃力が発生
するため、安定した制振制御を行ない難（、また、発錆
等の劣化が生じる問題がある。更に、摩擦ダンパは天井
とこれに対面する床面間に介在させるため、ワンフロア
−に対し２個所以上必要となり、階数が多くなると摩擦
タンパの数量が増大し、構造が複雑化する問題がある。In addition, with the friction damper method, impact force is generated during operation due to the difference between the static friction coefficient and the dynamic friction coefficient of the metal plate, making it difficult to perform stable vibration damping control (and causing problems such as deterioration such as rusting). Furthermore, since friction dampers are interposed between the ceiling and the floor facing it, two or more friction dampers are required for each floor, and as the number of floors increases, the number of friction dampers increases and the structure becomes more complex. be.
本発明は、上述の問題を解決するためになされたもので
、本発明の目的は、応答性に優れ、構造物に対する負担
も小さく、簡易な構成で構造物の制振を安定して行える
構造物の制振装置を提供するにある。The present invention has been made in order to solve the above-mentioned problems, and an object of the present invention is to create a structure that has excellent responsiveness, reduces the burden on the structure, and can stably damp the vibration of the structure with a simple configuration. To provide vibration damping devices for objects.
（課題を解決するための手段）
前記目的を達成するための本発明を実施例に対応する図
面を参照して説明する。(Means for Solving the Problems) The present invention for achieving the above object will be described with reference to drawings corresponding to embodiments.
本発明は、構造物ｌの内部に設置され磁性流体３が封入
された所定容積の容器２と、電流が供給されることで前
記容器２内の磁性流体に磁力を作用し前記構造物ｌの重
心を変化させる電磁コイル４と、前記電磁コイル４に電
流を供給する電源９とを備えてなる構造物の制振装置で
ある。The present invention includes a container 2 of a predetermined volume installed inside a structure l and filled with a magnetic fluid 3, and a magnetic force applied to the magnetic fluid in the container 2 by supplying an electric current to the structure l. This is a vibration damping device for a structure comprising an electromagnetic coil 4 that changes the center of gravity, and a power source 9 that supplies current to the electromagnetic coil 4.
（作用）
電磁コイル４が励磁され、その磁力が容器２内の磁性流
体３に作用すると、磁性流体３内の磁気微粒子が容器２
内を移動して構造物ｌの重心位置が変わる。これにより
構造物ｌ全体の固有振動数を変化させ、その共振点を外
部振動周波数帯域外へ移行させる。(Function) When the electromagnetic coil 4 is excited and its magnetic force acts on the magnetic fluid 3 in the container 2, the magnetic particles in the magnetic fluid 3 are attracted to the container 2.
The position of the center of gravity of structure l changes as it moves inside. This changes the natural frequency of the entire structure l and moves its resonance point out of the external vibration frequency band.
従って、磁性流体３に磁力を与えるという簡易な構成で
構造物ｌの制振を安定して行なえ、しかも外部からの振
動に迅速に応答でき、制振装置の構造物ｌに対する負担
も小さくできる。Therefore, with a simple configuration of applying magnetic force to the magnetic fluid 3, vibrations of the structure 1 can be stably damped, and moreover, it is possible to quickly respond to external vibrations, and the load on the structure 1 of the vibration damping device can be reduced.
この場合、電磁コイル４の配設箇所は容器２の上下や左
右或は内部など任意である。In this case, the electromagnetic coil 4 may be disposed at any location such as above and below the container 2, on the left and right sides, or inside the container 2.
また、電磁コイル４に供給される電流値を外部振動波の
周波数に応じて変化させることにより、構造物ｌの振動
の低減を容易にコントロールでき、制振制御が最適とな
る。Further, by changing the current value supplied to the electromagnetic coil 4 according to the frequency of the external vibration wave, the reduction in vibration of the structure I can be easily controlled, and vibration damping control can be optimized.
（実施例） 以下、本発明の実施例を図面に基づいて説明する。(Example) Embodiments of the present invention will be described below based on the drawings.
第１図は第１実施例の概略構成図である。FIG. 1 is a schematic configuration diagram of the first embodiment.
ｌは地上に設置される建築等の構造物で、構造物ｌの内
部には、非磁性材料からなる所定大きさ、形状の密閉容
器２を設置する。1 is a structure such as a building installed on the ground, and inside the structure 1 is installed an airtight container 2 of a predetermined size and shape made of a non-magnetic material.
容器２内には、構造物ｌ全体の固有振動数を変化させる
磁性流体３を充填封入する。The container 2 is filled and sealed with a magnetic fluid 3 that changes the natural frequency of the entire structure 1.
容器２の下部には、磁性流体３に磁力を作用させること
で構造物ｌの重心を変化させるための電磁コイル４を設
置し、電磁コイル４は電源装置９と接続する。この場合
、電磁コイル４として超電導材料を利用すれば、エネル
ギロスが少なく効率的である。At the bottom of the container 2, an electromagnetic coil 4 is installed to change the center of gravity of the structure 1 by applying a magnetic force to the magnetic fluid 3, and the electromagnetic coil 4 is connected to a power supply device 9. In this case, if a superconducting material is used as the electromagnetic coil 4, it is efficient with less energy loss.
前記磁性流体３は、例えば水又は溶液と磁性微粒子とを
混合したコロイド溶液で構成する。The magnetic fluid 3 is composed of, for example, water or a colloidal solution in which a solution and magnetic fine particles are mixed.
容器２の構造物ｌ内への設置位置、大きさ及び形状は、
封入される磁性流体３の比重、電磁コイル４から発生す
る磁力を勘案して決定し、これにより構造物１全体の固
有振動数が構造物ｌに作用する危険な振動帯域から外れ
るように選定する。The installation position, size and shape of the container 2 within the structure l are as follows:
It is determined by taking into account the specific gravity of the magnetic fluid 3 to be enclosed and the magnetic force generated from the electromagnetic coil 4, and is selected so that the natural frequency of the entire structure 1 is out of the dangerous vibration band that acts on the structure 1. .
上記のように構成された本実施例の制振装置において、
電磁コイル４が非励磁状態にある時、磁性流体３中の磁
性微粒子は容器２内全体に均一に分散しているため、磁
性流体封入容器２を含めた構造物ｌ全体の重心は、第２
図（ａ）に示すように底面からＬ２の位置にある。なお
、磁性流体封入容器２がない場合の構造体ｌの重心は、
第２図（ｂ）に示すように底面からＬｌ （Ｌｌ＞Ｌ
２）の位置にある。In the vibration damping device of this embodiment configured as described above,
When the electromagnetic coil 4 is in a non-excited state, the magnetic particles in the magnetic fluid 3 are uniformly dispersed throughout the container 2, so the center of gravity of the entire structure l including the magnetic fluid-filled container 2 is at the second
As shown in Figure (a), it is located at L2 from the bottom surface. In addition, the center of gravity of the structure l when there is no magnetic fluid enclosure container 2 is
As shown in Figure 2(b), Ll (Ll>L
2).
また、電磁コイル４が通電により励磁されると、第１図
の破線に示すように磁束が発生し、これにより磁性流体
３中の磁性微粒子を容器２の底部へ吸収集合させるため
、容器２底部側の比重が大きくなる。これに伴い磁性流
体封入容器２を含めた構造物全体の重心は、第１図に示
すように底面からＬ３ （、Ｌ−１＞Ｌ２＞Ｌ３）の位
置に変化する。Furthermore, when the electromagnetic coil 4 is excited by electricity, a magnetic flux is generated as shown by the broken line in FIG. The specific gravity on the side increases. Accordingly, the center of gravity of the entire structure including the magnetic fluid-filled container 2 changes to a position L3 (L-1>L2>L3) from the bottom surface, as shown in FIG.
このように構造物１の重心がＬ２からＬ３へと変化する
と、構造物ｌ全体の固有振動数がｆ２からｆ３ （ｆ２
＜ｆ３）へと増加し、これによって地盤振動等に対する
構造物ｌの共振点が上昇することになり、地盤振動等に
対する構造物ｌの振動が低減されることになる。When the center of gravity of structure 1 changes from L2 to L3 in this way, the natural frequency of the entire structure 1 changes from f2 to f3 (f2
<f3), thereby raising the resonance point of the structure l with respect to ground vibrations, etc., and reducing the vibration of the structure l with respect to ground vibrations etc.
本実施例では、構造物ｌ内部に磁性流体３を封入した容
器２を設置し、この容器２内の磁性流体３の比重分布を
電磁コイル４の磁力により変化させることで構造体ｌの
重心を下方へ変化させ、その固有振動数を増大方向へ変
化させるものであるから、構造物１の見掛けの同期特性
を容易にコントロールでき、地震動等に対する構造物ｌ
の振動を容易に低減し得る。In this embodiment, a container 2 containing a magnetic fluid 3 is installed inside a structure 1, and the specific gravity distribution of the magnetic fluid 3 in the container 2 is changed by the magnetic force of an electromagnetic coil 4 to center the gravity of the structure 1. Since it changes the natural frequency downward and increases its natural frequency, the apparent synchronization characteristics of the structure 1 can be easily controlled, and the structure l against earthquake motion etc.
vibration can be easily reduced.
また、構造物の固有振動数を変化させる重量可変体は磁
性流体であり、通常（電磁コイル４に通電していない時
）この磁性流体は比重が小さいため、構造物に対する構
造上の負担を小さくできる。In addition, the variable weight body that changes the natural frequency of the structure is a magnetic fluid, and normally (when the electromagnetic coil 4 is not energized) this magnetic fluid has a small specific gravity, so it reduces the structural burden on the structure. can.
また、従来の摩擦ダンパ方式のような発錆等による経年
変化もなく、安定した制振機能を維持できる。Furthermore, unlike conventional friction damper systems, there is no aging effect due to rust, and a stable vibration damping function can be maintained.
第３図は第２実施例の概略構成図である。FIG. 3 is a schematic diagram of the second embodiment.
第２実施例では、地盤上に建築した構造物１内の床面上
に磁性流体３を封入した密閉容器２を支持台６を介して
設置し、容器２の下部には電磁コイル４を設置すると共
に、ｉｉｍコイル４に供給される電力を制御する制御部
７を設けている。In the second embodiment, a closed container 2 containing a magnetic fluid 3 is installed on the floor of a structure 1 built on the ground via a support 6, and an electromagnetic coil 4 is installed at the bottom of the container 2. At the same time, a control section 7 that controls the power supplied to the IIM coil 4 is provided.
また、構造物１から離れた地点には、地盤振動を検知す
るための振動センサ８を複数個設置し、この各振動セン
サ８で検知した地震波動信号を前記制御部７に入力する
ようにしている。Further, a plurality of vibration sensors 8 for detecting ground vibration are installed at a point away from the structure 1, and seismic wave signals detected by each vibration sensor 8 are inputted to the control section 7. There is.
また、制御部７の制御信号は電磁コイル４に電力を供給
する電源装置９に出力するようにしている。Further, the control signal from the control section 7 is outputted to a power supply device 9 that supplies power to the electromagnetic coil 4.
次に、第２実施例の動作を第４図に示すフローチャート
を参照して説明する。Next, the operation of the second embodiment will be explained with reference to the flowchart shown in FIG.
地盤振動が発生すると、各振動センサ８が地震振動波を
検知し、これを電流信号に変換して制御部７に人力する
（ステップＳＬ）。When ground vibration occurs, each vibration sensor 8 detects an earthquake vibration wave, converts this into a current signal, and manually inputs it to the control unit 7 (step SL).
制御部７では、入力した地震波動の周波数を解析しくス
テップＳ２）、次のステップＳ３において、構造物１の
全体の固有振動数が危険な地盤振動数帯域から外れるよ
うに電磁コイル４への最適電流値を決定する制御指令を
求める。The control unit 7 analyzes the frequency of the input seismic waves (step S2), and in the next step S3, optimizes the electromagnetic coil 4 so that the natural frequency of the entire structure 1 is out of the dangerous ground frequency band. Find the control command that determines the current value.
そして、この制御指令を電源装置９に加えることによっ
て、電源袋＠９から電磁コイル４に通電される電流を制
御する（ステップＳ４）。Then, by applying this control command to the power supply device 9, the current flowing from the power supply bag @9 to the electromagnetic coil 4 is controlled (step S4).
電磁コイル４に電流が流れると、その電流値に応じた磁
力が発生し、この磁力が容器２内の磁性流体３に作用す
ることによって、磁性流体３内の磁性微粒子が容器の底
部側へ吸引集合する。When a current flows through the electromagnetic coil 4, a magnetic force corresponding to the current value is generated, and as this magnetic force acts on the magnetic fluid 3 inside the container 2, the magnetic particles inside the magnetic fluid 3 are attracted to the bottom side of the container. Gather.
その結果、構造物ｌ全体の重心は第１図の場合と同様に
下方へ移動し、同時に構造物１全体の固有振動数を最適
値に上昇させて地盤振動の周波数帯域から外し、構造物
１が地盤振動と共振しないようにする。これにより構造
物１は制振され、構造物ｌの振動が低減されることにな
る。As a result, the center of gravity of the entire structure 1 moves downward as in the case of Fig. 1, and at the same time, the natural frequency of the entire structure 1 is raised to the optimum value and removed from the frequency band of ground vibration, and the structure 1 prevent it from resonating with ground vibrations. As a result, the structure 1 is damped, and the vibration of the structure 1 is reduced.
このように第２実施例では、第１実施例と同様な効果が
得られるほか、構造物の固有振動数を地盤振動の周波数
に対応させて変化できるので、構造物の制振制御が最適
となる。In this way, in the second embodiment, in addition to obtaining the same effects as in the first embodiment, the natural frequency of the structure can be changed in accordance with the frequency of ground vibration, so that the vibration damping control of the structure can be optimized. Become.
なお、第１．第２実施例では、容器２の下部に電磁コイ
ル４を配設した場合について説明したが、電磁コイル４
の配設箇所は適用する構造物の形状や、容器の配設箇所
等に応じて容器２の上下や左右或は内部に配設する等任
意である。In addition, 1. In the second embodiment, the case where the electromagnetic coil 4 is disposed at the bottom of the container 2 has been described, but the electromagnetic coil 4
The arrangement location is arbitrary, such as disposing it above and below, on the left and right sides, or inside the container 2, depending on the shape of the structure to which it is applied, the location of the container, etc.
（発明の効果）
以上の説明から明らかなように、本発明によれば、磁性
流体に磁力を与えて構造物の重心を変え、これにより構
造物全体の固有振動数を変化させる構成であるので、応
答性に優れ、構造物に対する負担も小さく、簡易な構成
で構造物の制振を安定して行うことができる。(Effects of the Invention) As is clear from the above description, according to the present invention, magnetic force is applied to the magnetic fluid to change the center of gravity of the structure, thereby changing the natural frequency of the entire structure. , it has excellent responsiveness, has a small burden on the structure, and can stably damp the vibration of the structure with a simple configuration.
第１図は本発明に係る第１実施例の概略構成図、第２図
（ａ）（ｂ）はその説明図、第３図は第２実施例の概略
構成図、第４図はその動作説明用のフローチャートであ
る。
尚図中１は構造物、２は容器、３は磁性流体、４は電磁
コイル、７は制御部、８は振動センサ、９は電源装置で
ある。
特 許 出 願 人 フジタ工業株式会社代理人
弁理士 野 １） 茂FIG. 1 is a schematic configuration diagram of the first embodiment according to the present invention, FIGS. 2(a) and (b) are explanatory diagrams thereof, FIG. 3 is a schematic configuration diagram of the second embodiment, and FIG. 4 is its operation. It is a flowchart for explanation. In the figure, 1 is a structure, 2 is a container, 3 is a magnetic fluid, 4 is an electromagnetic coil, 7 is a control section, 8 is a vibration sensor, and 9 is a power supply device. Patent applicant Agent: Fujita Kogyo Co., Ltd.
Patent Attorney No 1) Shigeru
Claims (3)
定容積の容器と、 電流が供給されることで前記容器内の磁性流体に磁力を
作用し前記構造物の重心を変化させる電磁コイルと、 前記電磁コイルに電流を供給する電源と、 を備えてなる構造物の制振装置。(1) A container with a predetermined volume installed inside a structure and filled with magnetic fluid; and an electromagnetic coil that applies magnetic force to the magnetic fluid in the container and changes the center of gravity of the structure when supplied with electric current. A vibration damping device for a structure, comprising: a power source that supplies current to the electromagnetic coil;
る請求項１記載の構造物の制振装置。(2) The vibration damping device for a structure according to claim 1, wherein the electromagnetic coil is installed at a lower part of the container.
周波数に基づいて最適値に制御する制御手段が設けられ
ている請求項１記載の構造物の制振装置。(3) The vibration damping device for a structure according to claim 1, further comprising a control means for controlling the current supplied to the electromagnetic coil to an optimum value based on the frequency of external vibration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP578389A JPH086498B2 (en) | 1989-01-12 | 1989-01-12 | Vibration control device for structures |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP578389A JPH086498B2 (en) | 1989-01-12 | 1989-01-12 | Vibration control device for structures |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02186072A true JPH02186072A (en) | 1990-07-20 |
| JPH086498B2 JPH086498B2 (en) | 1996-01-24 |
Family
ID=11620705
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP578389A Expired - Lifetime JPH086498B2 (en) | 1989-01-12 | 1989-01-12 | Vibration control device for structures |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH086498B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5321923A (en) * | 1992-06-17 | 1994-06-21 | Hitachi Metals, Ltd. | Antivibration actuator |
| JPH0971303A (en) * | 1995-03-30 | 1997-03-18 | Kongo Kk | Movable shelf |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3152920B1 (en) | 2014-06-03 | 2018-11-28 | Dolby Laboratories Licensing Corporation | Audio speakers having upward firing drivers for reflected sound rendering |
| WO2019111335A1 (en) * | 2017-12-05 | 2019-06-13 | 株式会社 東芝 | Vibration control device |
-
1989
- 1989-01-12 JP JP578389A patent/JPH086498B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5321923A (en) * | 1992-06-17 | 1994-06-21 | Hitachi Metals, Ltd. | Antivibration actuator |
| JPH0971303A (en) * | 1995-03-30 | 1997-03-18 | Kongo Kk | Movable shelf |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH086498B2 (en) | 1996-01-24 |
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