JPS6398539A - Apparatus for discovering water leak point - Google Patents
Apparatus for discovering water leak pointInfo
- Publication number
- JPS6398539A JPS6398539A JP24642086A JP24642086A JPS6398539A JP S6398539 A JPS6398539 A JP S6398539A JP 24642086 A JP24642086 A JP 24642086A JP 24642086 A JP24642086 A JP 24642086A JP S6398539 A JPS6398539 A JP S6398539A
- Authority
- JP
- Japan
- Prior art keywords
- water
- sound
- power
- frequency band
- water leak
- 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
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 89
- 230000005236 sound signal Effects 0.000 claims abstract description 12
- 238000005259 measurement Methods 0.000 claims description 16
- 239000000284 extract Substances 0.000 abstract description 4
- 238000001514 detection method Methods 0.000 description 11
- 238000010586 diagram Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 3
- 238000000611 regression analysis Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/24—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using infrasonic, sonic, or ultrasonic vibrations
- G01M3/243—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using infrasonic, sonic, or ultrasonic vibrations for pipes
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、水道管の損傷による漏水から発生する音（漏
水音）の集音地点（測定点）から、水道管の損傷点（漏
水点）までの水道管の管延長を１１測する漏水点発見装
置に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention is aimed at detecting the sound generated from water leakage due to water pipe damage (leakage sound) from the sound collection point (measurement point) to the water pipe damage point (water leakage point). This invention relates to a water leak point detection device that measures the length of water pipes up to 11 points.
本発明は漏水音の集音地点から水道管の漏水点までの水
道管の管延長を推測する漏水点発見装置において、
集音地点における漏水音の全周波数帯域成分のパワーお
よび低周波数帯域成分のパワーをそれぞれ測定し、この
二つのパワー測定値に基づいて管延長を推測することに
より、
集音地点から漏水点までの水道管の管延長の推測を機械
的に行えるようにしたものである。The present invention is a water leak point detection device that estimates the length of a water pipe from a water leak sound collection point to a water pipe leak point. By measuring each power and estimating the length of the pipe based on these two power measurements, it is possible to mechanically estimate the length of the water pipe from the sound collection point to the leak point.
従来、漏水音の集音地点から漏水点までの水道管の管延
長は、熟練を積んだ作業者が経験により推測していた。Conventionally, the length of a water pipe from the point where water leakage sound is collected to the point of water leakage has been estimated by experienced workers based on experience.
この推測作業は、次の手順で行われることが多い。This guessing work is often done in the following steps.
第１ステップ：漏水点に近いと思われる水道メータを探
す。First step: Find a water meter that is likely to be close to the leak point.
第２ステップ：この水道メータに音聴棒と呼ばれる鉄の
棒を取り付け、この音聴棒を用いて水道管を伝わってく
る漏水音を作業者が聞く。作業者は、この音から集音地
点（水道メータ）から漏水点までの水道管の管延長を経
験に基づき推測する。Second step: An iron rod called a listening rod is attached to the water meter, and the worker uses this listening rod to listen to the sound of water leaking through the water pipes. Based on this sound, the worker estimates the length of the water pipe from the sound collection point (water meter) to the leak point based on experience.
〔発明が解決しようとする問題点］
しかし、このような従来の漏水点発見作業（管延長の推
測作業）では、第１ステツプおよび第２ステツプとも作
業者の経験に基づいて行われていいる。特に、第２ステ
ツプにおける音聴ｉ奉を用いて聞いた漏水音から、測定
点（水道メータ）から漏水点までの管延長を推測するこ
とは、経験を積んだ熟練者でなければできない作業であ
る。現実にはこの熟練者の数が限られているために、漏
水点発見作業の効率を上げることが難しい欠点があった
。[Problems to be Solved by the Invention] However, in such conventional leakage point detection work (estimated pipe extension work), both the first step and the second step are performed based on the experience of the operator. In particular, estimating the length of the pipe from the measurement point (water meter) to the leakage point based on the water leakage sound heard using the audio system in the second step is a task that only an experienced and skilled person can do. be. In reality, the number of skilled workers is limited, making it difficult to increase the efficiency of leak detection work.
本発明は上記の欠点を解決するもので、集音点から漏水
点までの水道管の管延長の推測を機械的に行うことがで
きる漏水点発見装置を提供することを目的とする。The present invention solves the above-mentioned drawbacks, and aims to provide a water leak point finding device that can mechanically estimate the length of a water pipe from a sound collection point to a water leak point.
本発明は、集音地点に取り付けられたピックアップから
集音された漏水音信号を入力し、漏水音のパワーを測定
する第一のパワー測定部と、この漏水音信号を入力し、
漏水音の低周波数帯域成分を抽出するローパスフィルタ
と、このローパスフィルタの出力を入力し、漏水音の低
周波数帯域成分のパワーを測定する第二のパワー測定部
と、上記第一のパワー測定部の出力およびこの第二のパ
ワー測定部の出力に基づいて上記集音地点から漏水点ま
での水道管の管延長の推測値を計算する管延長推測部と
を備えたことを特徴とする。The present invention includes a first power measurement unit that inputs a water leakage sound signal collected from a pickup attached to a sound collection point and measures the power of the water leakage sound;
a low-pass filter that extracts the low-frequency band components of the water leakage sound; a second power measurement section that receives the output of the low-pass filter and measures the power of the low-frequency band components of the water leakage sound; and the first power measurement section. and a pipe extension estimating section that calculates an estimated value of the length of the water pipe from the sound collection point to the water leakage point based on the output of the power measuring section and the output of the second power measuring section.
第一の測定部で集音地点（水道メータ）に取り付けたピ
ックアップにより集音された漏水音信号を入力し、漏水
音のパワーを計算する。ローパスフィルタで漏水音信号
の低周波数帯域成分を抽出する、第二のパワー測定部で
ローパスフィルタの出力を入力し、漏水音の低周波数帯
域成分のパワーを測定する。管延長推測部で第１のパワ
ー測定部の出力および第二のパワー測定部の出力に基づ
いて漏水音の集音地点か′ら漏水点までの水道管の管延
長の推測値を計算する。以上の動作により集音地点から
漏水点までの水道管の管延長を機械的に推測することが
できる。In the first measuring section, the water leakage sound signal collected by the pickup attached to the sound collection point (water meter) is input, and the power of the water leakage sound is calculated. The low-frequency band component of the water leakage sound signal is extracted using a low-pass filter.The output of the low-pass filter is input to the second power measuring section, and the power of the low-frequency band component of the water leakage sound is measured. The pipe extension estimation section calculates an estimated value of the length of the water pipe from the water leakage sound collection point to the water leakage point based on the output of the first power measurement section and the output of the second power measurement section. Through the above operations, it is possible to mechanically estimate the length of the water pipe from the sound collection point to the water leakage point.
本発明の実施例について図面を参照して説明する。 Embodiments of the present invention will be described with reference to the drawings.
第１図は本発明−実施例漏水点発見装置のブロック構成
図である。第１図において、漏水点発見装置は、水道メ
ータに取り付けられ漏水音を集音するピックアップ１と
、ピックアップｌの出力漏水音信号７を入力し、漏水音
の全周波数帯域成分のパワーを測定するパワー測定部２
と、ピックアップ１の出力漏水音信号７を入力し、漏水
音の低周波数帯域成分を抽出するローパスフィルタ３と
、ローパスフィルタ３の出力低周波数帯域信号８を入力
し低周波数帯域成分のパワーを測定するパワー測定部４
と、パワー測定部２の出力信号Ｐおよびパワー測定部４
の出力信号ＰＬを入力して管延長の推測値ｄを計算する
管延長推測部５と、管延長推測部５の出力管延長の推測
値ｄを表示する管延長表示部６を備える。FIG. 1 is a block diagram of a water leak point detection device according to an embodiment of the present invention. In Fig. 1, the water leak point detection device inputs a pickup 1 attached to a water meter and collects water leak sound, and a water leak sound signal 7 output from pickup 1, and measures the power of all frequency band components of the water leak sound. Power measurement section 2
Then, the output water leakage sound signal 7 of the pickup 1 is inputted, and the low-pass filter 3 extracts the low-frequency band component of the water leakage sound, and the output low-frequency band signal 8 of the low-pass filter 3 is inputted, and the power of the low-frequency band component is measured. power measuring section 4
, the output signal P of the power measuring section 2 and the power measuring section 4
The tube extension estimating section 5 inputs the output signal PL of and calculates the estimated value d of the tube extension, and the tube extension display section 6 displays the estimated value d of the tube extension output from the tube extension estimating section 5.
このような構成の漏水点発見装置の動作について説明す
る。第２図は本発明の漏水点発見装置の漏水音の全周波
数帯域成分のパワーの音圧レベルと管延長との散布図で
ある。第３図は本発明の漏水点発見装置の漏水音の低周
波数帯域成分のパワーと全周波数帯域成分のパワーとの
比のパーセンテージと管延長との散布図である。The operation of the water leak point detection device having such a configuration will be explained. FIG. 2 is a scatter diagram of the sound pressure level of the power of all frequency band components of the water leakage sound of the water leak point detection device of the present invention and the pipe length. FIG. 3 is a scatter diagram of the ratio of the power of the low frequency band component of the water leak sound to the power of the entire frequency band component and the pipe length in the water leak point finding device of the present invention.
第１図において、取り付けられたピックアップｌで漏水
音を集音する。このピックアップ１の出力信号（漏水音
信号７）は、パワー測定部２およびローパスフィルタ３
に入力される。パワー測定部２の出力信号Ｐは、漏水音
信号７の全周波数帯域成分のパワーである。一方、ロー
パスフィルタ３では、漏水音信号７から漏水音の低周波
数帯域成分のみを含む低周波数帯域信号８を抽出する。In Fig. 1, the sound of water leakage is collected by the attached pickup l. The output signal of this pickup 1 (water leakage sound signal 7) is transmitted to a power measuring section 2 and a low-pass filter 3.
is input. The output signal P of the power measuring section 2 is the power of all frequency band components of the water leakage sound signal 7. On the other hand, the low-pass filter 3 extracts a low frequency band signal 8 containing only low frequency band components of the water leak sound from the water leak sound signal 7.
パワー測定部４には、この漏水音の低周波数帯域成分の
みを含む低周波数帯域信号８が入力され、漏水音の低周
波数帯域成分のパワーが出力信号ＰＬとして出力される
。管延長推測部５では、出力信号Ｐおよび出力信号ＰＬ
に基づいて集音地点（水道メータ）から漏水点までの水
道管の管延長を計算により推測する。この管延長の推測
値ｄは、管延長表示部６で表示される。A low frequency band signal 8 containing only the low frequency band components of the water leakage sound is input to the power measuring section 4, and the power of the low frequency band components of the water leakage sound is output as an output signal PL. In the pipe extension estimating section 5, the output signal P and the output signal PL
Based on this, the length of the water pipe from the sound collection point (water meter) to the leak point is estimated by calculation. This estimated value d of the tube extension is displayed on the tube extension display section 6.
ここで管延長推測部５で行う管延長の推定の原理を以下
に説明する。第２図は６２点の測定現場における音圧レ
ベルｘ（ｄＢ） （ｘ＝１０ ｌｏｇ＋ｏＰ）と管延長
ｄ （ｍ）との関係を示す散布図である。第２図に示す
実線は、回帰分析（最小二乗法）により直線をあてはめ
たものである。第２図によると音圧レベルＸが大きい程
管延長ｄは小さく、音圧レベルＸが小さい程管延長ｄは
大きい、という関係がなりたつことがわかる。音圧レベ
ルＸと管延長ｄの間には負の相関がある。Here, the principle of estimating the tube extension performed by the tube extension estimating section 5 will be explained below. FIG. 2 is a scatter diagram showing the relationship between sound pressure level x (dB) (x=10 log+oP) and pipe length d (m) at 62 measurement sites. The solid line shown in FIG. 2 is a straight line fitted by regression analysis (least squares method). According to FIG. 2, it can be seen that the larger the sound pressure level X is, the smaller the pipe extension d is, and the smaller the sound pressure level X is, the larger the pipe extension d is. There is a negative correlation between the sound pressure level X and the pipe length d.
第３図は同じ＜６２点の測定現場における低域パワー比
ｙ（％） （ｙ ＝１００ Ｐｔ／ Ｐ）と管延長ｄと
の関係を示した散布図である。第３図に示す実線は、第
２図と同様に回帰分析（最小二乗法）により直線をあて
はめたものである。第３図によると、低域パワー比ｙが
大きい程管延長ｄは大きく、低域パワー比ｙが小さい程
管延長ｄは小さいという関係がなりたつことがわかる。FIG. 3 is a scatter diagram showing the relationship between the low frequency power ratio y (%) (y = 100 Pt/P) and the pipe length d at the same measurement site of <62 points. The solid line shown in FIG. 3 is a straight line fitted by regression analysis (least squares method) as in FIG. 2. According to FIG. 3, it can be seen that the larger the low frequency power ratio y is, the larger the tube extension d is, and the smaller the low frequency power ratio y is, the smaller the tube extension d is.
低域パワー比ｙと管延長ｄとの間には正の相関がある。There is a positive correlation between the low frequency power ratio y and the tube length d.
以上述べたように、音圧レベルＸおよび低域パワー比ｙ
はともに管延長ｄと相関関係を持つので、音圧レベルＸ
および低域パワー比ｙの値から管延長ｄの値を推測する
ことができる。As mentioned above, the sound pressure level X and the low frequency power ratio y
Since both have a correlation with the pipe length d, the sound pressure level
The value of the tube extension d can be estimated from the value of the low frequency power ratio y.
次に、管延長推測部５での管延長の推測値ｄの計算例を
以下に示す。第２図および第３図で用いた６２点の測定
点について、
ｄ＝β。＋βｌｘ＋β２ｙ＋ε
ただしεは誤差成分とし、このかたちのモデルを回帰分
析（最小二乗法）によりあてはめると、β。−〇、１３
β、 ＝−０，１２
β２ ＝ ０．０４６
となる。この値を用いて、管延長推測部５では、管延長
の推測値ｄを出力信号Ｐ、ＰＬの値を用いて、
と計算することができる。Next, an example of calculating the estimated value d of the pipe extension by the pipe extension estimating section 5 will be shown below. For the 62 measurement points used in Figures 2 and 3, d=β. +βlx+β2y+ε However, ε is an error component, and when a model of this form is fitted by regression analysis (least squares method), β is obtained. −〇, 13 β, = −0,12 β2 = 0.046. Using this value, the tube extension estimation unit 5 can calculate the estimated value d of the tube extension using the values of the output signals P and PL as follows.
以上説明したように、本発明は、漏水音の全周波数帯域
成分のパワーおよび低周波数帯域成分のパワーを測定す
ることにより、従来経験を積んだ熟練者が行っていた集
音地点（水道メータ）から漏水点までの水道管の管延長
の推測作業を機械で置き換えることができる優れた効果
がある。As explained above, the present invention measures the power of all frequency band components and the power of low frequency band components of water leakage sound, thereby improving the sound collection point (water meter), which was previously performed by an experienced person. This has the excellent effect of allowing machines to replace the work of guessing the length of water pipes from the point to the point of water leakage.
第１図は本発明−実施例漏水点発見装置のブロック構成
図。
第２図は本発明の漏水点発見装置の音圧レベルと管延長
との関係を示す散布図。
第３図は本発明の漏水点発見装置の低域パワー比と管延
長との関係を示す散布図。
１・・・ピックアップ、２．４・・・パワー測定部、３
・・・ローパスフィルタ、５・・・管延長推測部、６・
・・管延長表示部、７・・・漏水音信号、８・・・漏水
音の低周波数帯域信号、ｄ・・・管延長、ｄ・・・管延
長の推測値、Ｐ 、Ｐ ｔ・・・出力信号、Ｘ・・・音
圧レベル、ｙ・・・低域パワー比。FIG. 1 is a block diagram of a water leak point detection device according to an embodiment of the present invention. FIG. 2 is a scatter diagram showing the relationship between the sound pressure level and pipe length of the water leak point detection device of the present invention. FIG. 3 is a scatter diagram showing the relationship between the low-frequency power ratio and the pipe length of the water leak point detection device of the present invention. 1...Pickup, 2.4...Power measurement section, 3
...Low pass filter, 5...Pipe extension estimation section, 6.
... Pipe extension display section, 7... Water leak sound signal, 8... Low frequency band signal of water leak sound, d... Pipe extension, d... Estimated value of pipe extension, P , P t...・Output signal, X...Sound pressure level, y...Low frequency power ratio.
Claims (1)
された漏水音信号を入力し、漏水音のパワーを測定する
第一のパワー測定部と、 この漏水音信号を入力し、漏水音の低周波数帯域成分を
抽出するローパスフィルタと、 このローパスフィルタの出力を入力し、漏水音の低周波
数帯域成分のパワーを測定する第二のパワー測定部と、 上記第一のパワー測定部の出力およびこの第二のパワー
測定部の出力に基づいて上記集音地点から漏水点までの
水道管の管延長の推測値を計算する管延長推測部と を備えたことを特徴とする漏水点発見装置。(1) A first power measurement unit that inputs the water leakage sound signal collected from the pickup installed at the sound collection point and measures the power of the water leakage sound; a low-pass filter for extracting frequency band components; a second power measurement section for inputting the output of this low-pass filter and measuring the power of the low frequency band components of water leak sound; and the output of the first power measurement section and this A water leak point finding device comprising: a pipe extension estimating section that calculates an estimated value of the length of the water pipe from the sound collection point to the water leak point based on the output of the second power measuring section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24642086A JPS6398539A (en) | 1986-10-15 | 1986-10-15 | Apparatus for discovering water leak point |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24642086A JPS6398539A (en) | 1986-10-15 | 1986-10-15 | Apparatus for discovering water leak point |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6398539A true JPS6398539A (en) | 1988-04-30 |
Family
ID=17148212
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24642086A Pending JPS6398539A (en) | 1986-10-15 | 1986-10-15 | Apparatus for discovering water leak point |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6398539A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5267000A (en) * | 1991-12-17 | 1993-11-30 | Mita Industrial Co., Ltd. | Light amount controller for use in an image forming apparatus |
-
1986
- 1986-10-15 JP JP24642086A patent/JPS6398539A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5267000A (en) * | 1991-12-17 | 1993-11-30 | Mita Industrial Co., Ltd. | Light amount controller for use in an image forming apparatus |
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