JPH0318062B2 - - Google Patents
Info
- Publication number
- JPH0318062B2 JPH0318062B2 JP9604185A JP9604185A JPH0318062B2 JP H0318062 B2 JPH0318062 B2 JP H0318062B2 JP 9604185 A JP9604185 A JP 9604185A JP 9604185 A JP9604185 A JP 9604185A JP H0318062 B2 JPH0318062 B2 JP H0318062B2
- Authority
- JP
- Japan
- Prior art keywords
- vibration
- rod
- mounting frame
- weight
- damper
- 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
Links
- 239000006096 absorbing agent Substances 0.000 claims description 5
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
Classifications
-
- 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
- F16F7/00—Vibration-dampers; Shock-absorbers
- F16F7/10—Vibration-dampers; Shock-absorbers using inertia effect
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Vibration Prevention Devices (AREA)
Description
産業上の利用分野
本発明は、煙突、橋梁などの防振装置に関す
る。
従来の技術
第４図において、重錘０１がロツド０２の上端
に支持される。ロツド０２は下端をピン０３に枢
着され、バネ０４とダンパー０５により略垂直に
且つ揺動可能に保持される。
この振動系の固有振動数ｆは
INDUSTRIAL APPLICATION FIELD The present invention relates to vibration isolators for chimneys, bridges, etc. Prior Art In FIG. 4, a weight 01 is supported on the upper end of a rod 02. The rod 02 has its lower end pivotally connected to a pin 03, and is held substantially vertically and swingably by a spring 04 and a damper 05. The natural frequency f of this vibration system is
【式】で表わされ
る。
但し
ｍ：重錘０１の質量
Ｊ： 慣性モーメント（ロツドの質量を無視する
とml2 n）
ｇ：重力加速度
このような動吸振器の固有振動数を防振対象物
の固有振動数にほぼ合わせて取付けることによ
り、振動エネルギーをダンパーにて吸収し防振効
果を得る。
発明が解決しようとする問題点
前述した従来の動吸振器には次のような問題点
がある。
(イ) 長周期構造物（実際の構造物）への適用に難
点がある。
(ロ) 質量、バネの大きさ、又はそれらの取付装置
を調整して振動数を合わせるため、微調整が難
しい。
問題点を解決するための手段
(イ) 動吸振器の長周期化を容易にする。
(ロ) 傾斜角の調整機構を設けることにより、固有
振動数の調整を容易にする。
作 用
傾斜振子の傾斜角度を調節することにより、重
錘の質量と無関係に且つ長周期まで、固有振動数
が変化する。
実施例
第１図および第２図において、１は回転支承２
により傾斜角αを可変に支持された取付台枠、３
は取付台枠１の傾斜調整機構、４は取付台枠１に
突設された軸、５は軸受６により軸４に支承され
たロツド、７はロツド５の自由端に固着された重
錘、８はロツド５と取付台枠１との間に設けたダ
ンパーである。
この振動系の固有振動数をｆとするとIt is represented by [Formula]. However, m: Mass of weight 01 J: Moment of inertia (ml 2 n if the mass of the rod is ignored) g: Gravitational acceleration The natural frequency of such a dynamic vibration absorber should be approximately matched to the natural frequency of the object to be vibration-isolated. By installing it, vibration energy is absorbed by the damper and a vibration-proofing effect is obtained. Problems to be Solved by the Invention The conventional dynamic vibration reducer described above has the following problems. (b) There are difficulties in applying it to long-period structures (actual structures). (b) Fine adjustment is difficult because the frequency is matched by adjusting the mass, spring size, or their mounting device. Measures to solve the problem (a) Make it easier to lengthen the period of the dynamic vibration reducer. (b) Easily adjust the natural frequency by providing an inclination angle adjustment mechanism. Effect By adjusting the tilt angle of the tilted pendulum, the natural frequency changes over a long period, regardless of the mass of the weight. Embodiment In FIGS. 1 and 2, 1 is a rotation bearing 2
a mounting frame supported at a variable inclination angle α by 3;
is a tilt adjustment mechanism of the mounting frame 1; 4 is a shaft protruding from the mounting frame 1; 5 is a rod supported on the shaft 4 by a bearing 6; 7 is a weight fixed to the free end of the rod 5; 8 is a damper provided between the rod 5 and the mounting frame 1. If the natural frequency of this vibration system is f, then
【式】となる
一方、通常の（垂直）振子の固有振動数は次式
で表わせる。
上記(2)、(3)式を比較すると(2)式では(3)式のｇに
相当する項がgsioαとなつている。つまり、αを
変えることによりgsioαが変わり、ｆが変わるこ
とになる。すなわち、傾斜振子にすることによつ
て振子の長さ（ロツド長）ｌを調整することな
く、水平方向に対する傾きを変えることによつて
振動数の調整ができることを意味し、また、αを
小さくすればするほど長周期化が容易にできるこ
とを意味する。
防振対象物に本動吸振器を一個以上の回転支承
２で取付け、この回転支承２まわりに取付台枠１
を傾斜調整機構３で水平軸に対してαだけ傾斜す
るように調整して、固有振動数を防振対象物の振
動数にほぼ合わせる（0.95±0.1）。
防振対象物が振動すると動吸振器が作動し振動
エネルギーはロツド５又は重錘７に取付けられた
ダンパー８にて吸収され振動を抑制できる。
なお、本実施例を示す第１図ではダンパー８を
ロツド位置に設けているが重錘７の位置に設けて
もよい。また、回転支承２に代えて別途傾斜調整
機構３を設けてもよい。
第３図は、ロツド５′及び軸受６′を２個づつと
した他の実施例である。
発明の効果
ロツドの一端に重錘を固定し、他端を取付台枠
上に立設された軸体に回転自在に装着してなる振
子の動きを抑止するようにダンパーを配置すると
共に、前記取付台枠を、水平方向に対して任意に
傾斜角を保持・調整し得るように傾斜調整機構を
介して防振対象物に取付けたことにより、次の効
果を生ずる。
(イ) 質量に関係なく傾斜角αの調整のみで振動数
の調整ができる。
(ロ) 長周期まで対応することができる。即ち、
周期[Formula] On the other hand, the natural frequency of a normal (vertical) pendulum can be expressed by the following formula. Comparing Equations (2) and (3) above, in Equation (2), the term corresponding to g in Equation (3) is g sio α. In other words, by changing α, g sio α changes and f changes. In other words, by making the pendulum tilted, the frequency can be adjusted by changing the inclination with respect to the horizontal direction without adjusting the length (rod length) of the pendulum. This means that the longer the period is, the easier it is to lengthen the period. The main vibration absorber is mounted on the object to be vibration-isolated using one or more rotary supports 2, and the mounting frame 1 is mounted around the rotary supports 2.
is adjusted by the inclination adjustment mechanism 3 so that it is tilted by α with respect to the horizontal axis, and the natural frequency is approximately matched to the frequency of the object to be vibration-isolated (0.95±0.1). When the object to be vibration-proofed vibrates, the dynamic vibration absorber operates, and the vibration energy is absorbed by the damper 8 attached to the rod 5 or the weight 7, thereby suppressing the vibration. Although the damper 8 is provided at the rod position in FIG. 1 showing this embodiment, it may be provided at the weight 7 position. Further, instead of the rotation support 2, a separate tilt adjustment mechanism 3 may be provided. FIG. 3 shows another embodiment in which there are two rods 5' and two bearings 6'. Effects of the Invention A damper is arranged so as to suppress the movement of a pendulum, which is formed by fixing a weight to one end of the rod and rotatably attaching the other end to a shaft erected on a mounting frame. By attaching the mounting frame to the object to be vibration-proofed via the inclination adjustment mechanism so that the inclination angle can be arbitrarily maintained and adjusted with respect to the horizontal direction, the following effects are produced. (b) Regardless of the mass, the frequency can be adjusted simply by adjusting the tilt angle α. (b) Can support up to long periods. That is, period
【式】まで防振でき る。Vibration can be prevented up to [Formula] Ru.
第１図は本発明動吸振装置の実施例の側面図、
第２図は同上の−矢視図、第３図は他の実施
例の側面図、第４図は従来装置の概略図である。
１……取付台枠、２……回転支承、３……傾斜
調整機構、５……ロツド、６……軸受、７……重
錘、８……ダンパー。
FIG. 1 is a side view of an embodiment of the dynamic vibration absorber of the present invention;
FIG. 2 is a view taken from the same direction as the above, FIG. 3 is a side view of another embodiment, and FIG. 4 is a schematic diagram of a conventional device. 1... Mounting frame, 2... Rotating support, 3... Inclination adjustment mechanism, 5... Rod, 6... Bearing, 7... Weight, 8... Damper.
Claims (1)
枠上に立設された軸体に回転自在に装着してなる
振子の動きを抑止するようにダンパーを配置する
と共に、前記取付台枠を、水平方向に対して任意
に傾斜角を保持・調整し得るように傾斜調整機構
を介して防振対象物に取付けたことを特徴とする
動吸振装置。1. A damper is arranged so as to suppress the movement of a pendulum, which is formed by fixing a weight to one end of the rod and rotatably attaching the other end to a shaft erected on a mounting frame. A dynamic vibration absorber characterized in that a frame is attached to an object to be vibration-isolated via an inclination adjustment mechanism so that the inclination angle can be arbitrarily maintained and adjusted with respect to the horizontal direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9604185A JPS61256038A (en) | 1985-05-08 | 1985-05-08 | Dynamic vibration absorber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9604185A JPS61256038A (en) | 1985-05-08 | 1985-05-08 | Dynamic vibration absorber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61256038A JPS61256038A (en) | 1986-11-13 |
| JPH0318062B2 true JPH0318062B2 (en) | 1991-03-11 |
Family
ID=14154404
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9604185A Granted JPS61256038A (en) | 1985-05-08 | 1985-05-08 | Dynamic vibration absorber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61256038A (en) |
-
1985
- 1985-05-08 JP JP9604185A patent/JPS61256038A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61256038A (en) | 1986-11-13 |
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