JPS646685B2 - - Google Patents
Info
- Publication number
- JPS646685B2 JPS646685B2 JP55139860A JP13986080A JPS646685B2 JP S646685 B2 JPS646685 B2 JP S646685B2 JP 55139860 A JP55139860 A JP 55139860A JP 13986080 A JP13986080 A JP 13986080A JP S646685 B2 JPS646685 B2 JP S646685B2
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- vibration
- acoustic
- average frequency
- output
- 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
- 238000001514 detection method Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 238000001228 spectrum Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000005534 acoustic noise Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000010219 correlation analysis Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H1/00—Measuring characteristics of vibrations in solids by using direct conduction to the detector
- G01H1/04—Measuring characteristics of vibrations in solids by using direct conduction to the detector of vibrations which are transverse to direction of propagation
- G01H1/06—Frequency
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
- Monitoring And Testing Of Nuclear Reactors (AREA)
Description
【発明の詳細な説明】
本発明は振動検出装置に係り、特に、原子炉圧
力容器内の炉内構造物の如き容器内構造物の振動
を容器外から検出するに好適な振動検出装置に関
する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vibration detection device, and more particularly, to a vibration detection device suitable for detecting vibrations of vessel internal structures such as reactor internal structures in a nuclear reactor pressure vessel from outside the vessel.
従来、例えば原子炉圧力容器内に設置された炉
内構造物の振動を容器外から検知する手法に、音
響法がある。これは、振動によつて炉内構造物が
相互に摩擦、あるいは衝突を起こした際に発生す
る音響信号を検出することで振動検知を行なうも
のである。この手法では、音響ノイズが問題とな
る。つまり、冷却材の沸とうや流動によるノイ
ズ、周辺機器の動作ノイズが問題である。これら
のノイズが大きくなる原子炉稼動時には、音響法
による振動検知は困難になることが多い。 BACKGROUND ART Acoustic methods have conventionally been used to detect vibrations of reactor internals installed in, for example, a nuclear reactor pressure vessel from outside the vessel. This detects vibrations by detecting acoustic signals generated when reactor internals rub or collide with each other due to vibrations. Acoustic noise is a problem with this method. In other words, the problem is noise caused by boiling and flowing coolant, and noise from the operation of peripheral equipment. When a nuclear reactor is operating when these noises become large, it is often difficult to detect vibrations using acoustic methods.
本発明の目的は、ノイズが大きい場合でも確実
に振動を検知することのできる振動検出装置に関
する。 An object of the present invention is to relate to a vibration detection device that can reliably detect vibrations even when noise is large.
本発明は、音響検出器信号の平均周波数を求
め、この平均周波数の変化から振動検知を行なう
ものである。すなわち平均周波数変化ｆは、
ただし、π：円周率、ω：角周波数
Ｐ（ω）：ωにおけるパワー、
ωL、ωH：測定対象となる上、下限角周
波数
で定義され、簡単な演算回路で求め得る。 The present invention determines the average frequency of an acoustic detector signal and detects vibrations from changes in this average frequency. That is, the average frequency change f is Here, π: Pi, ω: Angular frequency P(ω): Power at ω, ω L , ω H : Defined by the upper and lower limit angular frequencies to be measured, and can be determined by a simple arithmetic circuit.
第１図は本発明の実施例を示すブロツク図であ
る。第１図において、１は加速度検出器などの音
響検出器であり、配管２、圧力容器３、計装管４
等に設置される。５は増幅器であり、音響検出器
１の出力を増幅する。６は帯域フイルタである。
７は平均周波数演算器、８は周波数分析器であ
る。９は分析結果の表示装置である。音響検出器
１では、炉内構造物の振動による相互の摩擦や衝
突で発生する音響信号のほか、ノイズ信号も検出
する。摩擦や衝突音と、ノイズ信号との周波数成
分が顕著に異なれば、フイルタ６の使用で摩擦や
衝突、つまり振動を検知できる。しかし、通常、
周波数成分の差異は微弱であり、フイルタ６を使
用しても摩擦や衝突による音響信号を検知できな
い。そこで、音響信号の平均周波数を平均周波数
演算器７で求め、この出力を周波数分析するよう
にしている。仮にノイズだけが存在する場合、平
均周波数演算器７の出力はある一定値を中心に時
間的に変動する。しかし、平均周波数演算器７の
出力を周波数分析した結果は、ノイズが不規則の
ためとくに顕著なピークを示さない。これに対
し、ノイズの中に振動による摩擦や衝突の音響信
号が含まれる場合、平均周波数演算器７の出力は
摩擦や衝突の音響信号の平均周波数側にずれる。
このずれの大きさは、ノイズの大きさと音響信号
の大きさ、つまりＳ／Ｎ比と両者の周波数成分の
差で決まる。よつて、両者の周波数成分に少しで
も差があれば、Ｓ／Ｎ比が１以下、つまり、ノイ
ズに埋れた音響信号でも検知できることになる。
平均周波数演算器７の出力を周波数分析すること
で、ノイズの平均周波数の変動の中に、振動の音
響信号によるピークを明確に認めることができ
る。このピークの大きさと位置を、あらかじめ設
定した値と比較することにより、炉内構造物の異
常振動を検知できる。 FIG. 1 is a block diagram showing an embodiment of the present invention. In FIG. 1, 1 is an acoustic detector such as an acceleration detector, piping 2, a pressure vessel 3, and an instrumentation pipe 4.
etc. will be installed. Reference numeral 5 denotes an amplifier, which amplifies the output of the acoustic detector 1. 6 is a band filter.
7 is an average frequency calculator, and 8 is a frequency analyzer. 9 is a display device for the analysis results. The acoustic detector 1 detects noise signals as well as acoustic signals generated by mutual friction and collision caused by vibrations of reactor internal structures. If the frequency components of the friction or collision sound and the noise signal are significantly different, the friction or collision, that is, vibration, can be detected by using the filter 6. However, usually
The difference in frequency components is so weak that even if the filter 6 is used, acoustic signals caused by friction or collision cannot be detected. Therefore, the average frequency of the acoustic signal is determined by an average frequency calculator 7, and this output is subjected to frequency analysis. If only noise exists, the output of the average frequency calculator 7 will fluctuate over time around a certain constant value. However, the result of frequency analysis of the output of the average frequency calculator 7 does not show any particularly noticeable peaks because the noise is irregular. On the other hand, when the noise includes an acoustic signal of friction or collision caused by vibration, the output of the average frequency calculator 7 shifts toward the average frequency of the acoustic signal of friction or collision.
The magnitude of this shift is determined by the magnitude of the noise and the magnitude of the acoustic signal, that is, the S/N ratio and the difference between the frequency components of the two. Therefore, if there is even a slight difference between the two frequency components, the S/N ratio is less than 1, that is, even an acoustic signal buried in noise can be detected.
By frequency-analyzing the output of the average frequency calculator 7, it is possible to clearly recognize the peak due to the vibration acoustic signal in the fluctuation of the average frequency of the noise. By comparing the magnitude and position of this peak with preset values, abnormal vibrations of the reactor internals can be detected.
本発明は、平均周波数を求め、この平均周波数
の変化から振動を検知するものであるが、この原
理を用いて振動検知するものとしては、上述の本
発明の平均周波数を周波数分析する方法のほか
に、第２図に示す方法（参考例）も有効である。 The present invention calculates an average frequency and detects vibration from changes in this average frequency. In addition to the above-mentioned method of frequency analyzing the average frequency of the present invention, vibrations are detected using this principle. The method shown in FIG. 2 (reference example) is also effective.
第２図に示す参考例は、第１図の実施例に増幅
器５の出力を低域過するいわゆるローパスフイ
ルタ１０及び、該フイルタ１０ならびに平均周波
数演算器７の各出力の相関をとる相関解析器１１
を追加ならびに置換したものである。フイルタ６
はバンドパスフイルタのほかハイパスフイルタで
も良い。フイルタ１０は検出器１の出力信号中か
ら振動成分を分離するために用いる。各フイルタ
の周波数帯域は、音響検出器１の周波数帯域や検
出信号の周波数成分等を考慮して決められる。相
関解析器１１は音響信号の平均周波数（演算器７
の出力）と振動信号（フイルタ１０の出力）の相
関をとるものであるが、クロススペクトルや相関
関係を用いる。振動によつて音響信号が発生する
場合、振動信号と音響信号の平均周波数との間に
は強い相関関係が存在する。振動信号、又は音響
信号を別個に観測しても、ノイズとの分離は難か
しいが、クロススペクトルなどの相関解析によ
り、振動の発生と振動周波数の検出が可能とな
る。 The reference example shown in FIG. 2 includes a so-called low-pass filter 10 that passes the output of the amplifier 5 at a low frequency, and a correlation analyzer that takes the correlation between the outputs of the filter 10 and the average frequency calculator 7, in addition to the embodiment shown in FIG. 11
This is the addition and replacement of . Filter 6
may be a high-pass filter in addition to a band-pass filter. The filter 10 is used to separate vibration components from the output signal of the detector 1. The frequency band of each filter is determined in consideration of the frequency band of the acoustic detector 1, the frequency components of the detection signal, and the like. The correlation analyzer 11 calculates the average frequency of the acoustic signal (computer 7
This method uses cross spectra and correlations to correlate the vibration signal (output of the filter 10) with the vibration signal (output of the filter 10). When an acoustic signal is generated by vibration, there is a strong correlation between the vibration signal and the average frequency of the acoustic signal. Even if a vibration signal or an acoustic signal is observed separately, it is difficult to separate it from noise, but correlation analysis such as cross spectrum makes it possible to detect the occurrence of vibration and the vibration frequency.
以上より明らかなように本発明によれば、ノイ
ズが大きい場合でも容器内構造物の振動を容器外
から確実に検知することができる。 As is clear from the above, according to the present invention, even when the noise is large, vibrations of the internal structure of the container can be reliably detected from outside the container.
第１図は本発明の実施例のブロツク図、第２図
は本発明の参考例のブロツク図である。
１…音響検出器、２…配管、３…原子炉圧力容
器、５…増幅器、６，１０…フイルタ、７…平均
周波数演算器、８…周波数分析器、９…表示装
置、１１…相関解析器。
FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a block diagram of a reference example of the present invention. DESCRIPTION OF SYMBOLS 1...Acoustic detector, 2...Piping, 3...Reactor pressure vessel, 5...Amplifier, 6, 10...Filter, 7...Average frequency calculator, 8...Frequency analyzer, 9...Display device, 11...Correlation analyzer .
Claims (1)
から検知する振動検出装置において、前記容器も
しくは前記構造物に直結した露出部分に設置され
音響信号を出力する音響検出器と、前記音響検出
器の出力に基づき平均周波数を算出する演算器
と、前記演算器の出力を周波数分析する周波数分
析器と、前記周波数分析器の分析結果を表示する
表示装置とを具備することを特徴とする振動検出
装置。1. A vibration detection device that detects vibrations of a structure installed inside a container from outside the container, including an acoustic detector installed on an exposed part directly connected to the container or the structure and outputting an acoustic signal; A vibration characterized by comprising: a computing device that calculates an average frequency based on the output of the computing device; a frequency analyzer that frequency-analyzes the output of the computing device; and a display device that displays the analysis results of the frequency analyzer. Detection device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55139860A JPS5764126A (en) | 1980-10-08 | 1980-10-08 | Oscillation detecting apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55139860A JPS5764126A (en) | 1980-10-08 | 1980-10-08 | Oscillation detecting apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5764126A JPS5764126A (en) | 1982-04-19 |
| JPS646685B2 true JPS646685B2 (en) | 1989-02-06 |
Family
ID=15255218
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP55139860A Granted JPS5764126A (en) | 1980-10-08 | 1980-10-08 | Oscillation detecting apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5764126A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59102126A (en) * | 1982-12-06 | 1984-06-13 | Babcock Hitachi Kk | Loose parts monitoring device |
| JP2003066015A (en) * | 2001-08-21 | 2003-03-05 | Ishikawajima Harima Heavy Ind Co Ltd | Signal processing method in acoustic emission method |
| JP5322742B2 (en) * | 2009-04-02 | 2013-10-23 | 株式会社東芝 | Reactor vibration monitoring method and reactor vibration monitoring system |
| KR20170051856A (en) * | 2015-11-02 | 2017-05-12 | 주식회사 아이티매직 | Method for extracting diagnostic signal from sound signal, and apparatus using the same |
-
1980
- 1980-10-08 JP JP55139860A patent/JPS5764126A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5764126A (en) | 1982-04-19 |
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