JPS629845B2 - - Google Patents
Info
- Publication number
- JPS629845B2 JPS629845B2 JP15194678A JP15194678A JPS629845B2 JP S629845 B2 JPS629845 B2 JP S629845B2 JP 15194678 A JP15194678 A JP 15194678A JP 15194678 A JP15194678 A JP 15194678A JP S629845 B2 JPS629845 B2 JP S629845B2
- Authority
- JP
- Japan
- Prior art keywords
- vibration
- resonance
- frequency
- occurrence
- resonance vibration
- 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
- 238000000034 method Methods 0.000 claims description 7
- 238000001514 detection method Methods 0.000 claims 3
- 239000000523 sample Substances 0.000 description 3
- 238000009530 blood pressure measurement Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 1
- 230000003534 oscillatory effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000005236 sound signal Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
Landscapes
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Description
【発明の詳細な説明】
本発明は、ボイラ火炉あるいはダクト内等に発
生する気柱共鳴振動を予知するための共鳴振動予
知方式に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a resonance vibration prediction method for predicting air column resonance vibrations occurring in a boiler furnace or duct.
ボイラ火炉あるいはダクト内等の空間内におい
ては、振動燃焼による気柱共鳴振動現象が時々起
り、騒音を発生したり、機器を損傷したりするの
で、その対策が以前から要望されていた。 In spaces such as boiler furnaces or ducts, air column resonance vibration phenomena due to oscillatory combustion sometimes occur, generating noise and damaging equipment, so countermeasures have long been desired.
しかるに、従来は、振動計、騒音計による変動
レベル測定、あるいは、圧力等の変動を直接電磁
オシログラフなどに記録し、振動の振幅、周波
数、波形、位相関係等の読み取りにより共鳴振動
の発生確認ができる位で、共鳴振動を事前に予測
し、振動による機器の損傷、騒音等のトラブルを
未然に防止することはできなかつた。 However, conventionally, the occurrence of resonant vibrations has been confirmed by measuring the fluctuation level using a vibration meter or sound level meter, or by directly recording fluctuations in pressure, etc. on an electromagnetic oscilloscope, etc., and reading the vibration amplitude, frequency, waveform, phase relationship, etc. However, it was not possible to predict resonance vibrations in advance and prevent problems such as equipment damage and noise caused by vibrations.
本発明の目的は、上記の点に鑑みなされたもの
であつて、共鳴振動の発生による機器の損傷、騒
音等のトラブルを未然に防止するために、共鳴振
動を事前に予測する共鳴振動予知方式を提供する
ことにある。 The purpose of the present invention has been made in view of the above points, and is a resonant vibration prediction method for predicting resonant vibrations in advance in order to prevent problems such as equipment damage and noise caused by the occurrence of resonant vibrations. Our goal is to provide the following.
この目的を達成するために、本発明は、機器内
に、ある周波数帯域幅に亙つてランダムにその振
動強度が変動している状態から、そのうちの特定
の周波数の振動強度のみが成長して、共鳴振動が
発生することに着目し、機器内の特定周波数成分
の振動強度と各周波数成分全体に亙る平均振動強
度との比を算出し、その比が所定値に達したこと
を以つて、共鳴振動の発生予測を行うようにした
ことを特徴とする。 In order to achieve this object, the present invention aims at increasing the vibration intensity of only a specific frequency within a device from a state in which the vibration intensity fluctuates randomly over a certain frequency bandwidth. Focusing on the occurrence of resonance vibration, we calculate the ratio between the vibration intensity of a specific frequency component in the device and the average vibration intensity over each frequency component, and when the ratio reaches a predetermined value, resonance is detected. It is characterized by predicting the occurrence of vibrations.
以下、本発明の具体的実施例を説明する前に、
先ず、本発明の原理を第１図乃至第３図を参照し
て説明する。 Below, before describing specific embodiments of the present invention,
First, the principle of the present invention will be explained with reference to FIGS. 1 to 3.
第１図及び第２図は、例えばボイラ火炉あるい
はダクト等の機器内の圧力変動を周波数分析して
表わした図で、第１図は、共鳴振動が発生する以
前の状態、第２図は共鳴振動時の状態を示す。 Figures 1 and 2 are diagrams showing frequency analysis of pressure fluctuations in equipment such as boiler furnaces or ducts. Figure 1 shows the state before resonance vibration occurs, and Figure 2 shows the state before resonance vibration occurs. Shows the state during vibration.
図から明らかなように、共鳴振動は全く何の前
触れもなく突然発生する訳でなく、共鳴振動が発
生する以前には、第１図に示すように、機器内に
はある周波数帯域に亙つてランダムにその振動強
度が変動する圧力変動が生じている。 As is clear from the figure, resonance vibrations do not occur suddenly without any warning; before resonance vibrations occur, as shown in Figure 1, there is a certain frequency band within the device. Pressure fluctuations occur in which the vibration intensity varies randomly.
この圧力変動が直ちに共鳴振動に結びつく訳で
はないが、共鳴振動を起す場合には、その圧力変
動における特定周波数成分の振動強度Ｉfが徐々
に成長して行き、やがて第２図の状態に達して共
鳴振動状態となることが出願人の解析結果により
判明した。 This pressure fluctuation does not immediately lead to resonance vibration, but when resonance vibration occurs, the vibration intensity I f of a specific frequency component in the pressure fluctuation gradually grows and eventually reaches the state shown in Figure 2. The applicant's analysis results have revealed that a resonant vibration state occurs.
しかも、特定周波数成分の振動強度Ｉfと、各
周波数成分全体に亙る平均振動強度I0との比Ｉ
f／I0を求めると、この比Ｉf／I0即ち共鳴周波数
成分発生率は、そのまま共鳴振動発生確率を表わ
すことが実験結果から明らかになつた。 Moreover, the ratio I between the vibration intensity I f of a specific frequency component and the average vibration intensity I 0 over all of each frequency component is
When f /I 0 is determined, it has been found from experimental results that this ratio I f /I 0 , that is, the rate of occurrence of resonance frequency components, directly represents the probability of occurrence of resonance vibration.
また、機器内にある周波数帯域幅に亙つてラン
ダムにその振動強度が変動する圧力変動が生じて
いる状態ａからある特定周波数成分の振動強度が
成長して共鳴振動を発生する状態ｃに至る時間経
過を共鳴周波数発生率について見ると、第３図に
示す関係が得られた。図の関係から、例えば共鳴
周波数発生率従つて共鳴振動発生確率が80％の状
態ｂになる時点ｔbは、共鳴振動を発生する時点
ｔcよりも充分前で、共鳴振動によるトラブルを
未然に防止できる時点であることから、この状態
ｂ即ち共鳴振動発生確率と共鳴振動発生トラブル
防止時間を考慮して決定した共鳴周波数発生率を
検出すれば、共鳴振動発生予知が得られ、その処
置を講ずることができる。 Also, the time required to reach state c, where the vibration intensity of a specific frequency component grows and generates resonant vibration, from state a, where pressure fluctuations occur where the vibration intensity varies randomly over a frequency bandwidth within the device. Looking at the progress with respect to the resonance frequency occurrence rate, the relationship shown in FIG. 3 was obtained. From the relationship shown in the figure, for example, the time t b when the resonance frequency generation rate and therefore the resonance vibration occurrence probability reach state b of 80% is sufficiently before the time t c when resonance vibration occurs, which prevents troubles due to resonance vibration from occurring. Since this is the point where it can be prevented, if we detect state b, that is, the resonance frequency occurrence rate determined by considering the resonance vibration occurrence probability and the resonance vibration occurrence trouble prevention time, we can obtain a prediction of resonance vibration occurrence and take measures accordingly. be able to.
本発明は、以上のような原理に基づいてなされ
たもので、以下に、その具体的実施例を第４図を
参照して説明する。 The present invention has been made based on the above principle, and a specific embodiment thereof will be described below with reference to FIG. 4.
図において、１は例えば、ボイラ火炉あるいは
ダクト等の共鳴振動の発生し得る対象機器、２は
その機器１内に配設された圧力測定プローブ、３
は圧力測定プローブ２により測定した機器１内の
圧力変動を電気信号に変換する圧力一電気信号変
換器、４は増幅器、５は演算装置、６は表示装置
である。 In the figure, 1 is a target device such as a boiler furnace or a duct where resonance vibration can occur, 2 is a pressure measurement probe installed in the device 1, and 3
numeral 4 is an amplifier, 5 is an arithmetic device, and 6 is a display device.
このように構成して、機器１内の圧力変動は測
定プローブ２で測定し、変換器３により電気信号
に変換し、増幅器４で増幅した後演算装置５に入
力する。 With this configuration, pressure fluctuations within the device 1 are measured by the measuring probe 2, converted to an electrical signal by the converter 3, amplified by the amplifier 4, and then input to the arithmetic unit 5.
演算装置５は、その電気信号を高速フーリエ変
換（FFT）を用いて周波数分析を行い、自己パ
ワースペクトルから、そのときのピーク値Ｉfを
求める。これと同時に各周波数に対する振動強度
の平均値（自乗平均値の平方根）I0を求め、その
比Ｉf／I0即ち共鳴周波数発生率を算出する。 The arithmetic unit 5 performs frequency analysis on the electrical signal using fast Fourier transform (FFT), and determines the peak value If at that time from the self-power spectrum. At the same time, the average value (square root of the root mean square value) I 0 of the vibration intensity for each frequency is determined, and the ratio I f /I 0 , that is, the resonance frequency occurrence rate is calculated.
この演算装置５で算出した共鳴周波数発生率を
表示装置６に刻々表示する。 The resonance frequency occurrence rate calculated by this calculation device 5 is displayed on a display device 6 every moment.
従つて、保守員は、その表示を見ることによ
り、現在表示されている共鳴周波数発生率即ち共
鳴振動発生確率から何秒後に共鳴振動が起り得る
か推測がつくので、その共鳴周波数発生率が所定
の値例えば80％に達したとき、ボイラの燃焼状態
を制御する等未然に共鳴振動の発生によるトラブ
ルを防止することができる。 Therefore, by looking at the display, maintenance personnel can estimate how many seconds later resonance vibration is likely to occur from the currently displayed resonance frequency occurrence rate, that is, the resonance vibration occurrence probability. When the value of , for example, reaches 80%, troubles due to the occurrence of resonance vibration can be prevented by controlling the combustion state of the boiler.
あるいは表示装置６に、共鳴振動確率と、共鳴
振動によるトラブルを未然に防止するために必要
な時間を考慮して、限界の共鳴周波数発生率をセ
ツトしておき、演算装置５で算出された値がその
限界値に達したとき、ランプあるいは音声により
警報を発生するようにしても良い。 Alternatively, a limit resonance frequency occurrence rate is set on the display device 6 in consideration of the resonance vibration probability and the time required to prevent troubles due to resonance vibration, and the value calculated by the calculation device 5 is set. When the limit value is reached, an alarm may be generated by a lamp or an audio signal.
尚、演算装置は、上記の演算処理を行う演算プ
ログラムを内蔵した専用計算機で構成しても良
く、あるいは演算装置に代えて汎用コンピユータ
を使用しても良い。あるいはまた、その演算装置
は多数のフイルタを有するアナログ分析器により
周波数分析を行い、上記演算処理を行うように構
成することもできる。 The arithmetic device may be a dedicated computer containing a built-in arithmetic program for performing the above arithmetic processing, or a general-purpose computer may be used instead of the arithmetic device. Alternatively, the arithmetic device may be configured to perform frequency analysis using an analog analyzer having a large number of filters and perform the above arithmetic processing.
以上の記載の通り、本発明によれば、機器内の
特定周波数成分の振動強度と各周波数成分全体に
亙る平均振動強度との比を算出し、その比が所定
値に達したことを以つて共鳴振動の発生予測を行
うようにしたので、共鳴振動の予測が可能とな
り、その結果、共鳴振動による機器の損傷、騒音
等のトラブル防止が可能となり、機器操作条件の
変更等が安全に実施できる。 As described above, according to the present invention, the ratio between the vibration intensity of a specific frequency component in the device and the average vibration intensity over all of the frequency components is calculated, and when the ratio reaches a predetermined value, Since the occurrence of resonance vibration is predicted, it is possible to predict resonance vibration, and as a result, it is possible to prevent problems such as equipment damage and noise caused by resonance vibration, and changes to equipment operating conditions can be carried out safely. .
第１図は共鳴振動発生前における機器内の圧力
変動の周波数解析結果を示すグルフ、第２図は共
鳴振動時における機器内の圧力変動の周波数解析
結果を示すグラフ、第３図は共鳴振動発生過程に
おける共鳴周波数発生率の時間的変化状態を示す
グラフ、第４図は本発明の一実施例を示すブロツ
ク構成図である。
１…対象機器、２…圧力測定プローブ、３…圧
力一電気信号変換器、４…増幅器、５…演算器、
６…表示装置。
Figure 1 is a graph showing the frequency analysis results of pressure fluctuations within the equipment before resonance vibration occurs. Figure 2 is a graph showing the frequency analysis results of pressure fluctuations within the equipment during resonance vibration. Figure 3 is a graph showing the frequency analysis results of pressure fluctuations within the equipment during resonance vibration. FIG. 4 is a graph showing a temporal change in the resonance frequency generation rate during the process. FIG. 4 is a block diagram showing an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1...Target equipment, 2...Pressure measurement probe, 3...Pressure-electrical signal converter, 4...Amplifier, 5...Arithmetic unit,
6...Display device.
Claims (1)
する方式において、上記機器内の圧力変動を検出
する検出手段と、該検出手段からの信号を周波数
解析する解析手段と、該解析手段での解析結果を
基に各周波数の振動強度のうちのピーク値を得る
手段と、上記解析手段での解析結果を基に各周波
数全体の平均振動強度を得る手段と、上記ピーク
値の上記平均振動強度に対する比を算出する手段
とから成り、該比の値が所定値に達したことを検
出して上記気柱共鳴振動の発生予知を得るように
したことを特徴とする共鳴振動予知方式。 ２ 特許請求の範囲第１項記載において、前記検
出手段以外の各手段は計算機を用いて構成される
ことを特徴とする共鳴振動予知方式。 ３ 特許請求の範囲第１項記載において、前記解
析手段は多数のフイルタを有するアナログ分析器
で構成されることを特徴とする共鳴振動予知方
式。[Scope of Claims] 1. A method for predicting the occurrence of air column resonance vibration occurring within a device, comprising: a detection means for detecting pressure fluctuations within the device; and an analysis means for frequency-analyzing the signal from the detection means. , means for obtaining a peak value of the vibration intensity of each frequency based on the analysis result of the analysis means, means for obtaining an average vibration intensity of the entire frequency for each frequency based on the analysis result of the analysis means, and the peak and means for calculating a ratio of the value to the average vibration intensity, and detecting that the value of the ratio reaches a predetermined value to obtain a prediction of the occurrence of the air column resonance vibration. Vibration prediction method. 2. The resonance vibration prediction method as set forth in claim 1, wherein each means other than the detection means is constructed using a computer. 3. The resonance vibration prediction method according to claim 1, wherein the analysis means is comprised of an analog analyzer having a large number of filters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15194678A JPS5578217A (en) | 1978-12-11 | 1978-12-11 | Prediction system for resonant oscillation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15194678A JPS5578217A (en) | 1978-12-11 | 1978-12-11 | Prediction system for resonant oscillation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5578217A JPS5578217A (en) | 1980-06-12 |
| JPS629845B2 true JPS629845B2 (en) | 1987-03-03 |
Family
ID=15529654
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15194678A Granted JPS5578217A (en) | 1978-12-11 | 1978-12-11 | Prediction system for resonant oscillation |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5578217A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61101244U (en) * | 1984-12-06 | 1986-06-27 | ||
| JPH06105225B2 (en) * | 1986-08-12 | 1994-12-21 | 光洋精工株式会社 | Appearance inspection device |
-
1978
- 1978-12-11 JP JP15194678A patent/JPS5578217A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5578217A (en) | 1980-06-12 |
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