JPH03117745A - Dynamic oscillation absorber - Google Patents

Dynamic oscillation absorber

Info

Publication number
JPH03117745A
JPH03117745A JP1254662A JP25466289A JPH03117745A JP H03117745 A JPH03117745 A JP H03117745A JP 1254662 A JP1254662 A JP 1254662A JP 25466289 A JP25466289 A JP 25466289A JP H03117745 A JPH03117745 A JP H03117745A
Authority
JP
Japan
Prior art keywords
pendulum
weight
fulcrum
natural frequency
length
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
Application number
JP1254662A
Other languages
Japanese (ja)
Inventor
Yukio Fujiwara
幸男 藤原
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Toshiba Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toshiba Corp filed Critical Toshiba Corp
Priority to JP1254662A priority Critical patent/JPH03117745A/en
Publication of JPH03117745A publication Critical patent/JPH03117745A/en
Pending legal-status Critical Current

Links

Classifications

    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00Energy generation of nuclear origin
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00Energy generation of nuclear origin
    • Y02E30/30Nuclear fission reactors

Landscapes

  • Vibration Prevention Devices (AREA)
  • Fluid-Damping Devices (AREA)

Abstract

PURPOSE:To easily vary characteristic oscillation number by composing a dynamic oscillation eliminator of a coil spring which is arranged so as to cause recovering force in respect to the displacement of a pendulum provided with a weight on a lower end thereof, and varying the distance from a fulcrum of the pendulum to the weight by means of a motor. CONSTITUTION:A dynamic oscillation absorber 10 is fixed on an upper part of an equipment 16 by means of a frame body 15. A pendulum 2 on whose lower end a weight 1 is installed is oscillatably provided on the frame body 15. A coil spring 4 which cause recovering force in respect to the displacement of the pendulum 2 is arranged between the pendulum 2 and the frame body 5. On an upper part of a fulcrum 2a of the pendulum 2, a motor 6 varying the distance from the fulcrum 2a to the weight 1 is arranged, while a length computing device 7 and an oscillation number measuring sensor 8 for the equipment 16 are connected to the motor 6. When the characteristic oscillation number of the equipment 16 is changed, the characteristic oscillation number of an oscillation eliminator 10 is easily agreed with that of the equipment 16 by varying the length of the pendulum 2, so that oscillations of the equipment 16 are effectively absorbed.

Description

【発明の詳細な説明】 〔発明の目的〕 (産業上の利用分野) 本発明は原子力発電所において用いる動的吸振器に係り
、とりわけ容易かつ確実に固有振動数を変更することが
できる動的吸振器に関する。
[Detailed description of the invention] [Object of the invention] (Industrial application field) The present invention relates to a dynamic vibration absorber used in a nuclear power plant, and particularly relates to a dynamic vibration absorber that can easily and reliably change the natural frequency. Regarding vibration absorbers.

(従来の技術) 従来の動的吸振器について、第7図およびm8図を用い
て説明する。
(Prior Art) A conventional dynamic vibration absorber will be explained using FIG. 7 and FIG. m8.

第7図に示すように、主振動系29にコイルばね24お
よびダンパ28を介して質量27が取付けられ、このコ
イルばね24、ダンパ28、および質量27によって動
的吸振器(副振動系)10が構成されている。主振動系
29と副振動系10の単独での固有振動数を一致させる
と、主振動系29と副振動系10とからなる連成系での
固有振動数は、単独での固有振動数より小さい値と大き
な値の非常に近接した2つの値を持つことになる。
As shown in FIG. 7, a mass 27 is attached to the main vibration system 29 via a coil spring 24 and a damper 28. is configured. When the individual natural frequencies of the main vibration system 29 and the sub-vibration system 10 are matched, the natural frequency of the coupled system consisting of the main vibration system 29 and the sub-vibration system 10 is higher than the natural frequency of the independent vibration system 10. You will have two very close values, a small value and a large value.

そして、この速成系における主振動系29の最大応答は
副振動系10を取付けなかった時よりも小さくなる。
The maximum response of the main vibration system 29 in this rapid generation system is smaller than when the sub vibration system 10 is not attached.

第8図は流体式動的吸振器の例である。主振動系29は
、内部に水22を貯留してなるタンク21を有しており
、このタンク21および水22により動的吸振器10が
構成されている。第8図の場合も、主振動系29と動的
吸振器10の111独の固有振動数を一致させることに
より、「はじき合い効果」によって主振動系10の最大
応答は、減少する。
FIG. 8 is an example of a fluid type dynamic vibration absorber. The main vibration system 29 has a tank 21 that stores water 22 therein, and the tank 21 and the water 22 constitute the dynamic vibration absorber 10. In the case of FIG. 8 as well, by making the natural frequencies of the main vibration system 29 and the dynamic vibration absorber 10 coincide with each other, the maximum response of the main vibration system 10 is reduced due to the "repulsion effect."

(発明が解決しようとする課題) 上述のように、主振動系29の振動を抑制するためには
、動的吸振器10単独の固有振動数を主振動系29単独
の固有振動数と一致させるのが最も効果が大きい。また
一致しない場合でも、両者の各々単独の固有振動数が近
ければ近い程、主振動系29の振動を抑制する効果は大
きい。逆に昌゛えば、動的吸振器10の固有振動数を主
振動系29の固有振動数に合わせることが出来なければ
、制振の効果がないということになる。
(Problem to be Solved by the Invention) As described above, in order to suppress the vibration of the main vibration system 29, the natural frequency of the dynamic vibration absorber 10 alone must match the natural frequency of the main vibration system 29 alone. is the most effective. Furthermore, even if they do not match, the closer the two individual natural frequencies are, the greater the effect of suppressing the vibration of the main vibration system 29 is. Conversely, if the natural frequency of the dynamic vibration absorber 10 cannot be matched to the natural frequency of the main vibration system 29, there will be no vibration damping effect.

ここで従来の動的吸振器の固有振動数を式で表わす。質
ff127をM1コイルばね24のばね定数をに1円周
率をπとすると、 このため、動的吸振器の固有振動数を変更するためには
、コイルばね24または、質量27を取替えるか、つけ
足すという面倒な作業が必要になる。
Here, the natural frequency of the conventional dynamic vibration absorber is expressed by an equation. If the spring constant of the M1 coil spring 24 is 127 and the pi is π, then in order to change the natural frequency of the dynamic vibration absorber, either the coil spring 24 or the mass 27 must be replaced, or The troublesome work of adding them is required.

一般に、動的吸振器10が先に完成し、その後主振動系
29が設計時と異なる固有振動数を持って完成した場合
、動的吸振器10の固有振動数の変更が必要となる。ま
た地震等によりどこかの支持部が壊れたり、ひびが入っ
たりして、主振動系29の固有振動数が変わった場合に
も、動的吸振器10の固有振動数の変更が必要となる。
Generally, if the dynamic vibration absorber 10 is completed first, and then the main vibration system 29 is completed with a natural frequency different from that at the time of design, it is necessary to change the natural frequency of the dynamic vibration absorber 10. Furthermore, if the natural frequency of the main vibration system 29 changes due to breakage or cracking of any supporting part due to an earthquake, etc., it is necessary to change the natural frequency of the dynamic vibration absorber 10. .

しかしながら、上述のように従来の動的吸振器の固有振
動数の変更は容易でない。
However, as mentioned above, it is not easy to change the natural frequency of a conventional dynamic vibration absorber.

本発明はこのような点を考慮してなされたものであり、
固有振動数を容易に変更することができる動的吸振器を
提供することを目的とする。
The present invention has been made in consideration of these points,
It is an object of the present invention to provide a dynamic vibration absorber whose natural frequency can be easily changed.

〔発明の構成〕[Structure of the invention]

(課題を解決するための手段) 本発明は、下端におもりが取付けられた振り子と、この
振り子の変位に対して復元力を生じさせるよう振り子に
設けられたばねとを備え、前記振り子の支点からおもり
までの長さ、または前記振り子の支点からばねまでの長
さを変動自在としたことを特徴とする動的吸振器である
(Means for Solving the Problems) The present invention includes a pendulum with a weight attached to its lower end, and a spring provided on the pendulum to generate a restoring force against displacement of the pendulum, and a This dynamic vibration absorber is characterized in that the length to the weight or the length from the fulcrum of the pendulum to the spring can be varied.

(作 用) 振り子の支点からおもりまでの長さ、または振り子の支
点からばねまでの長さを変動させることにより、容易か
つ簡単に動的吸振器の固有振動数を変化させることがで
きる。
(Function) By varying the length from the fulcrum of the pendulum to the weight or the length from the fulcrum of the pendulum to the spring, the natural frequency of the dynamic vibration absorber can be easily and simply changed.

(実施例) 以下、図面を参照して本発明の実施例について説明する
(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

まず第1図により、本発明の基本原理を説明する。動的
吸振器10は、下端におもり1が取付けられた振り子2
と、この振り子2に取付けられ、振り子2の変位に対し
て復元力を生じさせるように設けられたコイルばね4と
を備えている。
First, the basic principle of the present invention will be explained with reference to FIG. The dynamic vibration absorber 10 includes a pendulum 2 with a weight 1 attached to the lower end.
and a coil spring 4 attached to the pendulum 2 and provided to generate a restoring force against displacement of the pendulum 2.

また振り子2の支点2aからおもり1までの長さLmを
変更するために、振り子2の支点2a上部にモータ6が
設置されている。さらに、主振動系の固有振動を計測す
るセンサ8と、このセンサ8からの信号により支点2a
からおもり1までの長さLmを最適な値に定める演算装
置7が設けられ、この演算装置7はモータ6に接続され
ている。
Further, in order to change the length Lm from the fulcrum 2a of the pendulum 2 to the weight 1, a motor 6 is installed above the fulcrum 2a of the pendulum 2. Furthermore, a sensor 8 for measuring the natural vibration of the main vibration system and a signal from this sensor 8 are used to connect the fulcrum 2a.
A calculation device 7 is provided which determines the length Lm from the weight 1 to the weight 1 to an optimum value, and this calculation device 7 is connected to the motor 6.

次に基本原理の作用について説明する。Next, the operation of the basic principle will be explained.

まず、動的吸振器の固有振動数を示す。First, we will show the natural frequency of the dynamic vibration absorber.

おもりLの質量をm1コイルばね4のばね定数をに1振
り子2の支点2aからおもり1までの長さをLm、支点
2aからばね4までの長さをLkとし、円周率をπ、重
力加速度をgで表わせば、となる。従って、理論的には
、振り子2の支点からおもり1までの長さLm、または
振り子2の支点2aからばね4までの長さLkを変える
ことにより、固有振動数が調整可能となる。
The mass of the weight L is m, the spring constant of the coil spring 4 is 1, the length from the fulcrum 2a of the pendulum 2 to the weight 1 is Lm, the length from the fulcrum 2a to the spring 4 is Lk, the circumference is π, and gravity is If the acceleration is expressed in g, then Therefore, theoretically, by changing the length Lm from the fulcrum of the pendulum 2 to the weight 1, or the length Lk from the fulcrum 2a of the pendulum 2 to the spring 4, the natural frequency can be adjusted.

本実施例の場合は、センサ8によってまず主振動系の固
有振動数を計711 L、次にこのセンサ8からの信号
により振り子2の支点2aからおもり1までの最適長さ
Lmを演算装置7で算出する。この最適長さLmは、動
的吸振器の固有振動数を主振動系の固有振動数と一致さ
せる値である。
In the case of this embodiment, the sensor 8 first calculates the natural frequency of the main vibration system, which is 711 L, and then the calculation device 7 calculates the optimum length Lm from the fulcrum 2a of the pendulum 2 to the weight 1 using the signal from the sensor 8. Calculate with. This optimum length Lm is a value that makes the natural frequency of the dynamic vibration absorber match the natural frequency of the main vibration system.

次に演算装置7からの信号によりモータ6が駆動し、支
点2aからおもり1までの長さLmを演算装置7で求め
た値に調整する。このようにして動的吸振器10の固有
振動数を主振動系の固有振動数に一致させる。
Next, the motor 6 is driven by a signal from the arithmetic device 7, and the length Lm from the fulcrum 2a to the weight 1 is adjusted to the value determined by the arithmetic device 7. In this way, the natural frequency of the dynamic vibration absorber 10 is made to match the natural frequency of the main vibration system.

このように本実施例によれば、動的吸振器10の固有振
動数を容易かつ簡単に変更し、主振動系の固有振動数に
一致させることができる。
As described above, according to this embodiment, the natural frequency of the dynamic vibration absorber 10 can be easily and easily changed to match the natural frequency of the main vibration system.

次に第2図により本発明の応用例について説明する。Next, an application example of the present invention will be explained with reference to FIG.

第2図において、機器(主振動系)16の上部に、前述
の基本原理で説明した動的吸振器10が取付けられてい
る。
In FIG. 2, the dynamic vibration absorber 10 described above in terms of the basic principle is attached to the upper part of the device (main vibration system) 16.

この動的吸振器10は、機器16の上部に固る−された
枠体5を有している。また、枠体5にはレバーからなる
振り子2が揺動自在に設けられ、この振り子2の下端に
おもり1が取付けられている。
The dynamic vibration absorber 10 has a frame 5 fixed to the top of the device 16. Further, a pendulum 2 made of a lever is swingably provided on the frame 5, and a weight 1 is attached to the lower end of the pendulum 2.

さらに、振り子2と枠体5との間には、振り子2の変位
に対して1t1元力を生じさ\せるためのコイルばね4
が設けられてい◇0 また、振り子2の支点2aの上部には、振り子2の支点
2aからおもり1までの長さLmを変更するモータ6が
設置されている。さらに、このモータ6には、長さLm
を算出する演算装置7、および機器16の振動数を計測
するセンサ8が順次接続されている。このうち、モータ
6はレバーからなる振り子2を上下方向に移動させて支
点2aからおもり1までの長さLmを変更するものであ
る。またセンサ8は機器16に取付けられている。
Furthermore, a coil spring 4 is installed between the pendulum 2 and the frame 5 to generate a force of 1 t1 in response to the displacement of the pendulum 2.
◇0 Further, a motor 6 is installed above the fulcrum 2a of the pendulum 2 to change the length Lm from the fulcrum 2a of the pendulum 2 to the weight 1. Furthermore, this motor 6 has a length Lm
An arithmetic device 7 that calculates the vibration frequency of the device 16 and a sensor 8 that measures the frequency of the device 16 are connected in sequence. Of these, the motor 6 moves the pendulum 2 made of a lever in the vertical direction to change the length Lm from the fulcrum 2a to the weight 1. Further, the sensor 8 is attached to the device 16.

次に、第3図および第4図により本発明の他の応用例に
ついて説明する。
Next, other application examples of the present invention will be explained with reference to FIGS. 3 and 4.

第3図において、配管(主振動系)18の上部に、動的
吸振器10が取付けられている。また、配管18はサポ
ート19によって壁2oに支持されている。
In FIG. 3, a dynamic vibration absorber 10 is attached to the top of a pipe (main vibration system) 18. Further, the pipe 18 is supported by a support 19 on the wall 2o.

この動的吸振器10は、第2図の応用例と略同様の構成
となっているが、第4図に示すように振り子2と枠体5
との間に設けられたコイルばね4は放射線状に配置され
ている。また、センサ8は配管18に取付けられている
This dynamic vibration absorber 10 has approximately the same configuration as the application example shown in FIG. 2, but as shown in FIG.
The coil springs 4 provided between the two are arranged radially. Further, the sensor 8 is attached to the pipe 18.

地震等によりサポート19が壊れたり変形したりして配
管18の固有振動数が変化した場合、センサ8により配
管18の固有振動数を計測する。
When the support 19 is broken or deformed due to an earthquake or the like and the natural frequency of the pipe 18 changes, the sensor 8 measures the natural frequency of the pipe 18.

そして、このセンサ8からの信号にもとづき、演算装置
7およびモータ6によって動的吸振器10の固有振動数
を配管18の固有振動数に一致させることができる。ま
た、コイルばね4を放射状に配置することにより、あら
ゆる加圧方向の地震に対して適切な吸振作用を行なうこ
とができる。
Then, based on the signal from the sensor 8, the natural frequency of the dynamic vibration absorber 10 can be made to match the natural frequency of the pipe 18 by the arithmetic unit 7 and the motor 6. Moreover, by arranging the coil springs 4 radially, it is possible to perform an appropriate vibration absorbing action against earthquakes in any pressurizing direction.

なお、上記各実施例において、振り子の変位を復元させ
るばねとして、コイルばねを用いた例を示したが、これ
に限らず、例えば第5図に示す断面V字状の板ばね14
を用いてもよい。また第6図に示すように断面だ円状の
板ばね15を用いてもよい。
In each of the above embodiments, a coil spring is used as the spring for restoring the displacement of the pendulum. However, the present invention is not limited to this.
may also be used. Further, as shown in FIG. 6, a leaf spring 15 having an elliptical cross section may be used.

さらに上記実施例において、振り子2の支点2aからお
もり1までの長さLmを変化させた例を示したが、これ
に限らず振り子2の支点2aからばね4までの長さLk
を変化・させることによって固有振動数を変化させるこ
ともできる。
Further, in the above embodiment, an example was shown in which the length Lm from the fulcrum 2a of the pendulum 2 to the weight 1 was changed, but the length Lk from the fulcrum 2a of the pendulum 2 to the spring 4 is not limited to this.
It is also possible to change the natural frequency by changing/changing .

〔発明の効果〕〔Effect of the invention〕

以上説明したように、本発明によれば、動的吸振器の固
有振動数を容易かつ簡単に変化させることができる。こ
のため、主振動系の固有振動数の変化に対応して、動的
吸振器の固有振動数を主振動系の固有振動数に一致させ
ることにより、主振動系に加わる振動を効果的に吸振す
ることができる。
As explained above, according to the present invention, the natural frequency of the dynamic vibration absorber can be changed easily and simply. Therefore, by matching the natural frequency of the dynamic vibration absorber to the natural frequency of the main vibration system in response to changes in the natural frequency of the main vibration system, vibrations applied to the main vibration system can be effectively absorbed. can do.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明による動的吸振器の基本的原理を示す概
略側面図、第2図は本発明による動的吸振器の応用例を
示す概略側面図、第3図は本発明による動的吸振器の他
の応用例を示す概略側面図、第4図はそのコイルばねの
配置を示す平面図、第5図および第6図は板ばねの構造
を示す側面図、第7図および第8図は従来の動的吸振器
を示す側面図である。 1・・・おもり、2・・・振り子、4・・・コイルばね
、5・・・枠体、6・・・モータ、7・・・演算装置、
8・・・センサ、10・・・動的吸振器、16・・・機
器、18・・・配管。
FIG. 1 is a schematic side view showing the basic principle of the dynamic vibration absorber according to the present invention, FIG. 2 is a schematic side view showing an application example of the dynamic vibration absorber according to the present invention, and FIG. A schematic side view showing another application example of the vibration absorber, FIG. 4 is a plan view showing the arrangement of the coil spring, FIGS. 5 and 6 are side views showing the structure of the leaf spring, and FIGS. 7 and 8. The figure is a side view showing a conventional dynamic vibration absorber. DESCRIPTION OF SYMBOLS 1... Weight, 2... Pendulum, 4... Coil spring, 5... Frame, 6... Motor, 7... Arithmetic device,
8...Sensor, 10...Dynamic vibration absorber, 16...Equipment, 18...Piping.

Claims (1)

【特許請求の範囲】[Claims] 下端におもりが取付けられた振り子と、この振り子の変
位に対して復元力を生じさせるよう振り子に設けられた
ばねとを備え、前記振り子の支点からおもりまでの長さ
、または前記振り子の支点からばねまでの長さを変動自
在としたことを特徴とする動的吸振器。
A pendulum with a weight attached to its lower end, and a spring provided on the pendulum to generate a restoring force against displacement of the pendulum, the length from the fulcrum of the pendulum to the weight, or the length from the fulcrum of the pendulum to the spring. A dynamic vibration absorber characterized by a variable length.
JP1254662A 1989-09-29 1989-09-29 Dynamic oscillation absorber Pending JPH03117745A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1254662A JPH03117745A (en) 1989-09-29 1989-09-29 Dynamic oscillation absorber

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1254662A JPH03117745A (en) 1989-09-29 1989-09-29 Dynamic oscillation absorber

Publications (1)

Publication Number Publication Date
JPH03117745A true JPH03117745A (en) 1991-05-20

Family

ID=17268124

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1254662A Pending JPH03117745A (en) 1989-09-29 1989-09-29 Dynamic oscillation absorber

Country Status (1)

Country Link
JP (1) JPH03117745A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001280412A (en) * 2000-03-31 2001-10-10 Mitsubishi Electric Corp Dynamic vibration absorber for rotor and elevator using this absorber
JP2001349094A (en) * 2000-06-08 2001-12-21 Sekisui House Ltd Synchronous pendulum type vibration control device
JP2009270680A (en) * 2008-05-09 2009-11-19 Kajima Corp Vibration restraining device
JP2016065565A (en) * 2014-09-24 2016-04-28 カヤバ システム マシナリー株式会社 Vibration-proof device
JP2016156716A (en) * 2015-02-25 2016-09-01 日立Geニュークリア・エナジー株式会社 Spent fuel rack, nuclear power plant, and operation method of spent fuel rack
JP2019105293A (en) * 2017-12-11 2019-06-27 本田技研工業株式会社 Damper device

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001280412A (en) * 2000-03-31 2001-10-10 Mitsubishi Electric Corp Dynamic vibration absorber for rotor and elevator using this absorber
JP2001349094A (en) * 2000-06-08 2001-12-21 Sekisui House Ltd Synchronous pendulum type vibration control device
JP4729775B2 (en) * 2000-06-08 2011-07-20 オイレス工業株式会社 Tuned pendulum type vibration control device
JP2009270680A (en) * 2008-05-09 2009-11-19 Kajima Corp Vibration restraining device
JP2016065565A (en) * 2014-09-24 2016-04-28 カヤバ システム マシナリー株式会社 Vibration-proof device
JP2016156716A (en) * 2015-02-25 2016-09-01 日立Geニュークリア・エナジー株式会社 Spent fuel rack, nuclear power plant, and operation method of spent fuel rack
JP2019105293A (en) * 2017-12-11 2019-06-27 本田技研工業株式会社 Damper device

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