JP2839831B2 - Destruction detection method and destruction detection device by AE sound - Google Patents
Destruction detection method and destruction detection device by AE soundInfo
- Publication number
- JP2839831B2 JP2839831B2 JP28273593A JP28273593A JP2839831B2 JP 2839831 B2 JP2839831 B2 JP 2839831B2 JP 28273593 A JP28273593 A JP 28273593A JP 28273593 A JP28273593 A JP 28273593A JP 2839831 B2 JP2839831 B2 JP 2839831B2
- Authority
- JP
- Japan
- Prior art keywords
- sound
- destruction
- amplitude
- value
- internal
- 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 - Fee Related
Links
- 230000006378 damage Effects 0.000 title claims description 91
- 238000001514 detection method Methods 0.000 title claims description 9
- 238000000034 method Methods 0.000 claims description 42
- 238000011835 investigation Methods 0.000 claims description 17
- 238000005259 measurement Methods 0.000 claims description 6
- 238000011156 evaluation Methods 0.000 claims description 5
- 238000004364 calculation method Methods 0.000 description 13
- 238000010586 diagram Methods 0.000 description 11
- 238000012544 monitoring process Methods 0.000 description 11
- 208000010392 Bone Fractures Diseases 0.000 description 7
- 206010017076 Fracture Diseases 0.000 description 7
- 238000007476 Maximum Likelihood Methods 0.000 description 4
- 230000001186 cumulative effect Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 208000013201 Stress fracture Diseases 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
Landscapes
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
- Geophysics And Detection Of Objects (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、アコースティック・エ
ミッション音（以下「ＡＥ音」という。）を用いて調査
対象物の内部破壊を検知するＡＥ音による破壊検知方法
及び破壊検知装置に関するものである。たとえば岩すべ
りにおいて、破壊兆候がその表面に現れてから破壊に至
るまでの時間は短く、表面に変状が発生した段階では対
策が実施できず、安全対策上の問題も生じる。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for detecting a destruction of an object to be inspected by using an acoustic emission sound (hereinafter referred to as "AE sound"). . For example, in a rockslide, the time from the appearance of a fracture sign to its surface to its destruction is short, and no countermeasures can be taken when the surface is deformed, causing a problem in safety measures.
【０００２】しかして、このような破壊の監視にはＡＥ
法が有効と考えられる。ここで、ＡＥ音とは、物体内部
より発せられる音を意味し、取得されるＡＥ音（ＡＥ音
波）の特徴を利用し、ＡＥを発生させた物体の破壊状態
が判断できる。However, monitoring of such destruction requires AE
The law seems to be effective. Here, the AE sound means a sound emitted from the inside of the object, and the characteristic of the acquired AE sound (AE sound wave) can be used to determine the destruction state of the object that has generated the AE.
【０００３】[0003]
【従来の技術】従来、ＡＥ法によって調査すべき対象物
の内部破壊予知を行う場合、一般には取得ＡＥ音の発生
頻度をカウンタ１００で求め、この求められた発生頻度
から調査対象物の内部破壊を監視するＡＥ音の監視シス
テムが提案されている（図１２参照）。2. Description of the Related Art Conventionally, when predicting the internal destruction of an object to be investigated by the AE method, generally, the occurrence frequency of the acquired AE sound is obtained by a counter 100, and the internal destruction of the object to be investigated is determined from the obtained occurrence frequency. An AE sound monitoring system has been proposed (see FIG. 12).
【０００４】しかし、ＡＥ音の発生頻度は調査対象物に
よって各々異なっており、単純にＡＥ音の発生頻度のみ
の検出では正確な内部破壊の検知が出来なかった。そこ
で、ＡＥ音の振幅頻度分布より、所定の振幅の個数及び
振幅の範囲を算出し、該個数と範囲を用いて調査対象の
内部破壊を検知するＡＥ音の監視システムが提案される
に至った。However, the frequency of occurrence of the AE sound differs depending on the object to be investigated, and it is not possible to accurately detect internal destruction by simply detecting the frequency of occurrence of the AE sound. Therefore, an AE sound monitoring system has been proposed in which a predetermined number of amplitudes and a range of the amplitude are calculated from the amplitude frequency distribution of the AE sound, and the internal damage of the investigation target is detected using the number and the range. .
【０００５】ところで、算出に用いる振幅の個数または
振幅の範囲の設定の仕方により各種の検知方法が存在し
ている。まず、振幅の算出個数の決定については、累積
個数を用いる方法と時間固定個数を用いる方法とがあ
り、振幅の算出範囲の決定については、予め設定した２
点から算出する方法と最尤法あるいは最小二乗法によっ
て算出する方法と、さらに目見当による算出法とが考え
られる。There are various detection methods depending on how to set the number of amplitudes or the range of amplitudes used for calculation. First, there are a method of using a cumulative number and a method of using a fixed number of times for determining the number of amplitudes to be calculated.
A method of calculating from a point, a method of calculating by the maximum likelihood method or the method of least squares, and a calculation method by a guide are conceivable.
【０００６】ここで、振幅の算出個数の決定において、
累積個数を用いる方法とは、勾配算出時までに取得した
全データを用いて算出する方法をいい、時間固定個数を
用いる方法とは、一定時間内に取得したデータを用いて
算出する方法を指標する。また、振幅の算出範囲の決定
において、予め設定した２点から算出する方法とは、予
め算出に用いる上限振幅値と下限振幅値を設定し、それ
らの頻度から勾配を計算する方法である。Here, in determining the number of calculated amplitudes,
The method of using the cumulative number refers to a method of calculating using all data obtained up to the time of gradient calculation, and the method of using a fixed number of times refers to a method of calculating using data obtained within a certain period of time. I do. Further, in determining the calculation range of the amplitude, the method of calculating from two preset points is a method of setting an upper limit amplitude value and a lower limit amplitude value to be used for calculation in advance, and calculating a gradient from the frequency.
【０００７】次に、最尤法あるいは最小二乗法によって
算出する方法とは、振幅規模別頻度分布が指数分布をな
していることを前提として最尤推定値より計算する方法
をいう。さらに、目見当による算出法とは、振幅規模別
頻度分布をグラフ上にプロットして目見当により直線を
描き勾配を計算する方法を指標する。Next, the method of calculating by the maximum likelihood method or the method of least squares means a method of calculating from the maximum likelihood estimation value on the assumption that the frequency distribution for each amplitude scale forms an exponential distribution. Further, the calculation method based on the register indicates a method of plotting a frequency distribution for each amplitude scale on a graph, drawing a straight line based on the register, and calculating a gradient.
【０００８】しかし、振幅の算出個数の決定について、
前記累積個数を用いる方法では、データ数の増加に伴
い、求めた値が一定値に収束するため、たとえばある調
査対象物における同規模の内部破壊を同様の値として表
現できないとの課題がある。また、振幅の算出個数の決
定について、時間固定個数を用いる方法では、時間毎の
ＡＥ音のデータ数は異なることから、時間毎に違うデー
タ数を用いて値を算出することになり、前記累積個数を
用いる方法と同様にデータ数の増加に伴い、求めた値が
一定値に収束するとの課題がある。However, regarding the determination of the number of calculated amplitudes,
In the method using the cumulative number, since the obtained value converges to a constant value with an increase in the number of data, there is a problem that, for example, internal destruction of the same size in a certain investigation target cannot be expressed as a similar value. In the method of using the fixed number of times for determining the number of calculated amplitudes, since the number of data of the AE sound for each time is different, the value is calculated using a different number of data for each time. Similar to the method using the number, there is a problem that the obtained value converges to a constant value as the number of data increases.
【０００９】さらに、振幅の算出範囲の決定について、
予め設定した２点から算出する方法では、ＡＥ音測定前
に設定した振幅の範囲にＡＥ音データが分布しない場合
には、非直線近似区間を含む振幅範囲で値を算出しなけ
ればならないという課題がある。また、最尤法あるいは
最小二乗法によって算出する方法では、算出振幅の下限
値が必要となるので、前記の予め設定した２点から算出
する方法と同様に、非直線近似区間を含む振幅範囲で値
を算出しなければならないという課題がある。Further, regarding the determination of the amplitude calculation range,
In the method of calculating from two preset points, if the AE sound data is not distributed in the amplitude range set before the AE sound measurement, the value must be calculated in the amplitude range including the non-linear approximation section. There is. Further, in the method of calculating by the maximum likelihood method or the least square method, a lower limit value of the calculated amplitude is required. Therefore, as in the method of calculating from the two preset points, the amplitude range including the nonlinear approximation section is used. There is a problem that a value must be calculated.
【００１０】さらに、目見当による算出法では、直線近
似区間のみを目見当で判断できるが、該算出方法はリア
ルタイムな算出法とはいえず、正確性に欠ける算出法で
あるとの課題がある。[0010] Furthermore, in the calculation method based on the aim, only the straight-line approximation section can be determined by the aim, but there is a problem that the calculation method is not a real-time calculation method and is a calculation method lacking in accuracy. .
【００１１】[0011]
【発明が解決しようとする課題】本発明は前記従来のＡ
Ｅ法によって調査すべき対象物の内部破壊予知を行う方
法に存する各種課題を解決するために創案されたもので
あって、調査すべき対象物の物性に左右されず、かつ調
査対象の内部破壊予測が正確に、かつリアルタイムに行
えるＡＥ音による破壊検知方法及び破壊検知装置を提供
することを目的とするものである。SUMMARY OF THE INVENTION The present invention relates to the conventional A
It was created in order to solve various problems in the method of predicting internal destruction of an object to be investigated by the E method, and is not affected by the physical properties of the object to be investigated, and the internal destruction of the object to be investigated. It is an object of the present invention to provide a method and a device for detecting a destruction by an AE sound that can be accurately and in real time.
【００１２】[0012]
【課題を解決するための手段】上記の目的を達成するた
めに本発明は、以下のように構成されている。すなわ
ち、第１発明にかかるＡＥ音による破壊検知方法は、調
査対象物９の内部破壊挙動に伴って発生するＡＥ音を取
得し、該ＡＥ音によって内部破壊の検知を行う方法であ
り、ＡＥ音の振幅頻度分布より、所定時刻における評価
データを、所定時刻以前評価データの数１０個から数１
００個までと決定し、該条件から所定時刻における振幅
平均値μ及び振幅標準偏差値σを求め、さらに、求めら
れた該振幅平均値μ及び振幅標準偏差値σから振幅の下
限値ａｌ及び上限値ａｕを算出し、かつ、前記任意の振
幅範囲内で、振幅が下限値ａｌ以上の度数Ｎａｌ及び上
限値ａｕ以上の度数Ｎａｕを求め、前記求められた各値
ａｌ，ａｕ，Ｎａｌ，Ｎａｕから所定時刻における内部
破壊予想値Ｓを求める様構成され、また第２発明にかか
るＡＥ音による破壊検知方法は、第１発明において、経
過時間に沿って所定時刻における内部破壊予想値Ｓを継
続して逐次求める様構成されている。Means for Solving the Problems To achieve the above object, the present invention is configured as follows. That is, the destruction detection method using the AE sound according to the first invention is a method of acquiring an AE sound generated in accordance with the internal destruction behavior of the investigation object 9 and detecting the internal destruction by the AE sound. From the amplitude frequency distribution of the above, the evaluation data at the predetermined time is calculated from several tens of evaluation data before the predetermined time to several
00, and the amplitude average value μ and the amplitude standard deviation value σ at a predetermined time are obtained from the conditions, and the lower limit value al and the upper limit value of the amplitude are obtained from the obtained amplitude average value μ and the amplitude standard deviation value σ. A value au is calculated, and a frequency Nal whose amplitude is greater than or equal to a lower limit value al and a frequency Nau whose amplitude is greater than or equal to an upper limit value au are determined within the arbitrary amplitude range, and from the obtained values al, au, Nal, and Nau, The method for detecting a destruction of internal damage at a predetermined time S at a predetermined time is provided. The method for detecting destruction by AE sound according to the second invention is the method of the first invention, wherein the estimated value of internal destruction S at a predetermined time is continued along the elapsed time. It is configured to obtain it sequentially.
【００１３】さらに、第３発明にかかるＡＥ音による破
壊検知方法は、前記第１発明または第２発明において、
ＡＥ音の取得につき、導波棒１と、該導波棒１の両端に
取付られたＡＥセンサー２、２とを備えたＡＥ音計測具
３を、調査対象物内部に交叉状態に取り付けて行う様に
構成され、また、第４発明にかかるＡＥ音による破壊検
知装置は、調査対象物内部に交叉状態に取り付けられ
た、導波棒１と、該導波棒１の両端に取付られたＡＥセ
ンサー２、２とを備えたＡＥ音計測具３と、ＡＥ音計測
具３により計測されたＡＥ音から、調査対象物の内部破
壊位置を解析する破壊位置解析手段１０と、ＡＥ音計測
具３により計測されたＡＥ音から、調査対象物の内部破
壊状態を解析する破壊状態解析手段１１と、解析された
内部破壊位置及び内部破壊状態を表示する表示手段１２
と、解析された内部破壊位置及び内部破壊状態から、危
険状況の有無を判断する状況判断手段１３と、危険な状
況であると判断されたときに、警告が発せられる警告手
段１４と、を備えて構成されている。[0013] Further, the method for detecting destruction by AE sound according to the third invention is characterized in that in the first invention or the second invention,
For obtaining the AE sound, the AE sound measuring instrument 3 including the waveguide rod 1 and the AE sensors 2 and 2 attached to both ends of the waveguide rod 1 is attached in an intersecting state inside the investigation object. The AE sound destruction detection device according to the fourth aspect of the present invention includes a waveguide rod 1 mounted in a crossed state inside an object to be inspected, and AEs mounted on both ends of the waveguide rod 1. An AE sound measuring instrument 3 having sensors 2 and 2; a destruction position analyzing means 10 for analyzing an internal destruction position of an investigation object from an AE sound measured by the AE sound measuring instrument 3; State analysis means 11 for analyzing the internal destruction state of the investigation object from the AE sound measured by the AE, and display means 12 for displaying the analyzed internal destruction position and internal destruction state
And a situation determining means 13 for determining the presence or absence of a dangerous situation based on the analyzed internal destruction position and internal destruction state, and a warning means 14 for issuing a warning when it is determined that the situation is dangerous. It is configured.
【００１４】[0014]
【作用】本発明では、取得されたＡＥ音のデータから調
査対象の内部破壊予知を行う場合に、いわゆる破壊監視
のパラメータのとしてＡＥ音の発生頻度は参考程度とし
てある。そして、定性化、定量化した破壊監視のパラメ
ータを算出するために、ＡＥ音の振幅頻度分布より、所
定時刻における評価データを、所定時刻以前評価データ
の数１０個から数１００個までと決定する。According to the present invention, when predicting the internal destruction of the object to be investigated from the acquired AE sound data, the frequency of occurrence of the AE sound is a reference level as a so-called destruction monitoring parameter. Then, in order to calculate the qualitative and quantified parameters of the destruction monitoring, the evaluation data at a predetermined time is determined to be several tens to several hundreds of the evaluation data before the predetermined time from the amplitude frequency distribution of the AE sound. .
【００１５】ついでこれらから所定時刻における振幅平
均値μ及び振幅標準偏差値σを求める。さらに、求めら
れた該振幅平均値μ及び振幅標準偏差値σから振幅の下
限値ａｌ及び上限値ａｕを算出する。前記任意の振幅範
囲内で、振幅が下限値ａｌ以上の度数Ｎａｌ及び上限値
ａｕ以上の度数Ｎａｕを求め、前記求められた各値ａ
ｌ，ａｕ，Ｎａｌ，Ｎａｕから所定時刻における内部破
壊予想値Ｓを求める。Next, an amplitude average value μ and an amplitude standard deviation value σ at a predetermined time are obtained from these. Further, a lower limit value al and an upper limit value au of the amplitude are calculated from the obtained amplitude average value μ and amplitude standard deviation value σ. Within the arbitrary amplitude range, a frequency Nal whose amplitude is greater than or equal to a lower limit value al and a frequency Nau whose amplitude is greater than or equal to an upper limit value au are determined.
An expected value S of internal destruction at a predetermined time is obtained from 1, au, Nal, and Nau.
【００１６】また、経過時間に沿って、ある所定時刻に
おける内部破壊予想値Ｓが継続して逐次求められる。そ
して、この逐次求められた内部破壊予想値Ｓを用いて、
リアルタイムに調査対象の内部破壊レベル、時間、位置
を判断できるＡＥ音による内部破壊予知システムが構築
できる。Further, an expected value S of internal destruction at a predetermined time is continuously obtained along the elapsed time. Then, by using the sequentially calculated expected value S of the internal destruction,
An internal destruction prediction system based on an AE sound that can judge the internal destruction level, time, and position of the investigation target in real time can be constructed.
【００１７】[0017]
【実施例】以下、本発明を図に示す好適な実施例に基づ
いて説明する。 （１）内部破壊予想値Ｓの算出方法 図２に示すような斜面を有する調査対象物９に、導波棒
１の両端にＡＥセンサ２、２が取り付けられたＡＥ音計
測具３、３を取り付ける。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to a preferred embodiment shown in the drawings. (1) Calculation Method of Expected Internal Destruction Value S An AE sound measurement tool 3, 3 having AE sensors 2, 2 attached to both ends of a waveguide rod 1, is attached to an object 9 having a slope as shown in FIG. Attach.
【００１８】その取り付けは、一方のＡＥ音計測具３を
調査対象物９内に垂直に埋設し、他方のＡＥ音計測具３
は調査対象物９内に水平に埋設して行う。このような構
成で、調査対象物９の傾斜崩壊監視が行なわれる。する
と、図３の表に示す様なＡＥ音のデータが得られる（計
測時間はｔ1〜ｔn、振幅の単位はｄＢとする）。The AE sound measuring instrument 3 is mounted by vertically embedding one AE sound measuring instrument 3 in the object 9 to be inspected and the other AE sound measuring instrument 3
Is buried horizontally in the object 9 to be surveyed. With such a configuration, the inclination collapse monitoring of the investigation object 9 is performed. Then, data of the AE sound as shown in the table of FIG. 3 is obtained (measurement time is t 1 to t n , and the unit of amplitude is dB).
【００１９】ここで、時刻ｔ1における内部破壊予想値
Ｓｉの算出方法を以下に示す。（ただし、算出個数はα
個とする。）このとき、上下限振幅値を設定するため
に、まず、振幅平均値、振幅標準偏差値を求める（図
４、図５参照）。そして、振幅平均値、振幅標準偏差値
は図６のように算出される。Here, a method of calculating the expected internal damage value Si at time t 1 will be described below. (However, the calculated number is α
Number. At this time, in order to set the upper and lower limit amplitude values, first, an amplitude average value and an amplitude standard deviation value are obtained (see FIGS. 4 and 5). Then, the amplitude average value and the amplitude standard deviation value are calculated as shown in FIG.
【００２０】次に、振幅がａＬ以上の度数ＮａＬ及び振
幅がａＵ以上の度数ＮａＵを求める。これら度数は図７
により求められる。そして、以上から内部破壊予想値Ｓ
ｉは、図８のように算出される。ここで、この逐次求め
られた内部破壊予想値Ｓｉを利用すると、図９の様な内
部破壊予想値Ｓｉの経時変化が得られる。Next, a frequency NaL whose amplitude is equal to or more than aL and a frequency NaU whose amplitude is equal to or more than aU are obtained. These frequencies are shown in FIG.
Required by And, from the above, the expected value of internal destruction S
i is calculated as shown in FIG. Here, by using the sequentially calculated expected internal damage value Si, a temporal change of the expected internal damage value Si as shown in FIG. 9 can be obtained.
【００２１】そして、この内部破壊予想値Ｓｉの最大値
あるいは急激な低下時期を監視すれば、従来判断できな
かった調査対象内部の大規模破壊が判断できることとな
る。なお、ここで内部破壊予想値Ｓｉの上昇は、規模の
大きな破壊（ミクロ破壊）が大規模な破壊（マクロ破
壊）に比して多く発生していることを表し、反対に内部
破壊予想値Ｓｉの低下は大規模な破壊が卓越しているこ
とを表わしている。By monitoring the maximum value of the expected internal damage value Si or the timing of a rapid decrease, it is possible to determine a large-scale damage inside the investigation target, which could not be determined conventionally. Here, an increase in the expected internal fracture value Si indicates that a large-scale fracture (micro-fracture) occurs more frequently than a large-scale fracture (macro-fracture). The decline indicates that massive destruction is dominant.
【００２２】次に本発明による装置の構成を図１０に示
す構成説明図に基づいて説明する。ＡＥセンサー２から
取得したＡＥ音はアンプ２０により増幅され、該ＡＥ音
は破壊位置解析部２１に入力される。破壊位置解析部２
１では入力されたＡＥ音より、調査対象物９内の破壊位
置が解析される。Next, the configuration of the device according to the present invention will be described with reference to the configuration explanatory diagram shown in FIG. The AE sound obtained from the AE sensor 2 is amplified by the amplifier 20, and the AE sound is input to the destruction position analysis unit 21. Breaking position analysis unit 2
In 1, the destruction position in the investigation object 9 is analyzed from the input AE sound.
【００２３】すなわち、図１１から理解されるように、
調査対象物９の破壊面推定位置は垂直方向に設置された
ＡＥ音計測具３及び、水平方向に設置されたＡＥ音計測
具３の各導波棒１、１上の位置標定点の頻度分布より得
られるものである。そして、図１１では、破壊位置は水
平方向の導波棒１上ではＡ点、垂直方向の導波棒１上で
はＢ点と推定される。That is, as understood from FIG.
The estimated position of the fracture surface of the inspection object 9 is the frequency distribution of the AE sound measuring instrument 3 installed in the vertical direction and the position control points on the respective waveguide rods 1 and 1 of the AE sound measuring instrument 3 installed in the horizontal direction. It can be obtained more. In FIG. 11, the destruction position is estimated to be point A on the horizontal waveguide 1 and point B on the vertical waveguide 1.
【００２４】さらに、ＡＥ音は破壊状態解析部２２にも
入力される。そして、破壊状態解析部２２では前記入力
されたＡＥ音より、調査対象物９内の破壊状態が解析さ
れるのである。この破壊状態の解析は前記内部破壊予想
値Ｓをリアルタイムに継続して逐次算出することにより
行われる。Further, the AE sound is also input to the destruction state analysis unit 22. Then, the destruction state analysis unit 22 analyzes the destruction state in the investigation object 9 from the input AE sound. The analysis of the destruction state is performed by continuously calculating the expected internal destruction value S in real time.
【００２５】ここで、解析された内部破壊位置並びに内
部破壊状態はＣＲＴ２３上に表示され、該ＣＲＴ２３を
監視することにより、リアルタイムな調査対象物９の内
部破壊の監視が行える。また、解析された内部破壊位置
並びに内部破壊状態は、随時危険状況判断部２４へ送出
されており、該危険状況判断部２４が解析された内部破
壊位置並びに内部破壊状態から危険な状況であると判断
されたときには、警告部２５に警告を発し、速やかに危
険状況が周知されるよう構成されている。Here, the analyzed internal destruction position and the internal destruction state are displayed on the CRT 23, and by monitoring the CRT 23, the internal destruction of the investigation object 9 can be monitored in real time. The analyzed internal destruction position and internal destruction state are sent to the danger situation determination unit 24 as needed, and the danger status determination unit 24 determines that the analyzed internal destruction position and internal destruction state indicate a dangerous state. When the determination is made, a warning is issued to the warning unit 25, and the danger situation is immediately known.
【００２６】[0026]
【発明の効果】本発明は以上の構成よりなる。そして本
発明によるＡＥ音による内部破壊検知方法及び内部破壊
検知装置であれば、調査すべき対象物の物性に左右され
ずに調査対象物の内部破壊予測が正確に、かつリアルタ
イムに行えることとなる。The present invention has the above configuration. With the method and the device for detecting internal destruction based on the AE sound according to the present invention, the internal destruction of the inspection object can be accurately and in real time predicted without being affected by the physical properties of the object to be inspected. .
【００２７】また、本発明により求められた内部破壊予
想値Ｓは、計測時間に左右されないパラメータであるこ
とから、構造物の長期的監視においても定量値が把握で
き、破壊が確実に予測できるさらに、本発明によれば幾
数種、複数もの内部破壊を含む調査対象物の一連の破壊
監視が可能となる。The predicted value of internal damage S obtained by the present invention is a parameter independent of measurement time, so that a quantitative value can be grasped even in long-term monitoring of a structure, and destruction can be reliably predicted. According to the present invention, a series of destruction monitoring of an object to be inspected including several or several types of internal destruction becomes possible.
【００２８】また、逐次求められた内部破壊予想値Ｓの
変化傾向を監視し、さらにＡＥ音源位置を把握すること
により、破壊までの時間、破壊位置をも判断することが
できる。Further, by monitoring the change tendency of the sequentially estimated internal destruction value S and further grasping the AE sound source position, the time until destruction and the destruction position can be determined.
【図１】第４発明の原理説明図であるFIG. 1 is a diagram illustrating the principle of a fourth invention.
【図２】本発明によるＡＥ音計測具の設置状態説明図で
ある。FIG. 2 is an explanatory diagram of an installation state of an AE sound measuring tool according to the present invention.
【図３】本発明により得られたＡＥ音データを示す説明
図である。FIG. 3 is an explanatory diagram showing AE sound data obtained by the present invention.
【図４】振幅平均値及び振幅標準偏差値を算出するため
に参酌される説明図である。FIG. 4 is an explanatory diagram referred to for calculating an amplitude average value and an amplitude standard deviation value.
【図５】振幅平均値及び振幅標準偏差値を算出するため
に参酌される説明図である。FIG. 5 is an explanatory diagram referred to for calculating an amplitude average value and an amplitude standard deviation value.
【図６】振幅平均値及び振幅標準偏差値の算出方法を示
す説明図である。FIG. 6 is an explanatory diagram showing a method of calculating an amplitude average value and an amplitude standard deviation value.
【図７】振幅が上限値及び下限値以上の度数を算出する
算出方法を示す説明図である。FIG. 7 is an explanatory diagram illustrating a calculation method for calculating a frequency whose amplitude is equal to or more than an upper limit value and a lower limit value.
【図８】内部破壊予想値Ｓの算出方法を示す説明図であ
る。FIG. 8 is an explanatory diagram showing a method for calculating an expected internal damage value S.
【図９】内部破壊予想値Ｓの経時変化を示す説明図であ
る。FIG. 9 is an explanatory diagram showing a change over time of an expected internal damage value S.
【図１０】第４発明における一実施例の概略構成を示す
構成説明図である。FIG. 10 is a configuration explanatory view showing a schematic configuration of an embodiment in the fourth invention.
【図１１】破壊面位置の推定を行う説明図である。FIG. 11 is an explanatory diagram for estimating a fracture surface position.
【図１２】従来の内部破壊検知装置を示す説明図であ
る。FIG. 12 is an explanatory view showing a conventional internal destruction detection device.
１ 導波棒 ２ ＡＥセンサ ３ ＡＥ音計測具 ９ 調査対象物 １０ 破壊位置解析手段 １１ 破壊状態解析手段 １２ 表示手段 １３ 状況判断手段 １４ 警告手段 REFERENCE SIGNS LIST 1 waveguide rod 2 AE sensor 3 AE sound measuring tool 9 investigation object 10 destruction position analysis means 11 destruction state analysis means 12 display means 13 situation judgment means 14 warning means
Claims (4)
て発生するＡＥ音を取得し、該ＡＥ音によって内部破壊
の検知を行う方法であり、 ＡＥ音の振幅頻度分布より、所定時刻における評価デー
タを、所定時刻以前評価データの数１０個から数１００
個までと決定し、該条件から所定時刻における振幅平均
値μ及び振幅標準偏差値σを求め、 さらに、求められた該振幅平均値μ及び振幅標準偏差値
σから振幅の下限値ａｌ及び上限値ａｕを算出し、 かつ、前記任意の振幅範囲内で、振幅が下限値ａｌ以上
の度数Ｎａｌ及び上限値ａｕ以上の度数Ｎａｕを求め、 前記求められた各値ａｌ、ａｕ、Ｎａｌ，Ｎａｕから所
定時刻における内部破壊予想値Ｓを求めることを特徴と
するＡＥ音による破壊検知方法。1. A method for acquiring an AE sound generated in accordance with an internal destruction behavior of an investigation object (9) and detecting an internal destruction by the AE sound, wherein a predetermined time is obtained from an amplitude frequency distribution of the AE sound. Of the evaluation data before the predetermined time from several tens to several hundreds
And the amplitude average value μ and the amplitude standard deviation value σ at a predetermined time are obtained from the conditions. Further, the lower limit value al and the upper limit value of the amplitude are obtained from the obtained amplitude average value μ and the amplitude standard deviation value σ. au is calculated, and within the arbitrary amplitude range, a frequency Nal whose amplitude is equal to or more than a lower limit value al and a frequency Nau whose amplitude is equal to or more than an upper limit value au are determined, and a predetermined value is calculated from the obtained values al, au, Nal, and Nau. A destruction detection method using an AE sound, wherein an expected value S of internal destruction at a time is obtained.
て所定時刻における内部破壊予想値Ｓを継続して逐次求
めることを特徴とするＡＥ音による破壊検知方法。2. The method of detecting a destruction by an AE sound according to claim 1, wherein an estimated value of internal destruction S at a predetermined time is continuously obtained along an elapsed time.
ＡＥ音の取得は、導波棒（１）と、該導波棒（１）の両
端に取付られたＡＥセンサー（２、２）とを備えたＡＥ
音計測具（３）を、調査対象物内部に交叉状態に取り付
けて行うことを特徴とするＡＥ音による破壊検知方法。3. The method according to claim 1, wherein
The AE sound is obtained by an AE including a waveguide rod (1) and AE sensors (2, 2) attached to both ends of the waveguide rod (1).
A destruction detection method using an AE sound, wherein the sound measurement tool (3) is mounted in a crossed state inside an investigation object.
付けられた、導波棒（１）と、該導波棒（１）の両端に
取付られたＡＥセンサー（２、２）とを備えたＡＥ音計
測具（３）と、 ＡＥ音計測具（３）により計測されたＡＥ音から、調査
対象物の内部破壊位置を解析する破壊位置解析手段（１
０）と、 ＡＥ音計測具（３）により計測されたＡＥ音から、調査
対象物の内部破壊状態を解析する破壊状態解析手段（１
１）と、 解析された内部破壊位置及び内部破壊状態を表示する表
示手段（１２）と、 解析された内部破壊位置及び内部破壊状態から、危険状
況の有無を判断する状況判断手段（１３）と、 危険な状況であると判断されたときに、警告が発せられ
る警告手段（１４）と、 を備えたＡＥ音による破壊検
知装置。4. A waveguide rod (1) mounted in a crossed state inside an object to be investigated (9), and AE sensors (2, 2) mounted on both ends of the waveguide rod (1). An AE sound measuring instrument (3) provided with a AE sound measuring instrument (3); and a destruction position analyzing means (1) for analyzing an internal destruction position of the investigation object from the AE sound measured by the AE sound measuring instrument (3).
0), and a destruction state analysis means (1) for analyzing the internal destruction state of the investigation object from the AE sound measured by the AE sound measurement tool (3).
1), display means (12) for displaying the analyzed internal destruction position and internal destruction state, and situation determination means (13) for judging the presence or absence of a dangerous situation based on the analyzed internal destruction position and internal destruction state. An AE sound destruction detection device, comprising: a warning unit (14) for issuing a warning when it is determined that a dangerous situation is present.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28273593A JP2839831B2 (en) | 1993-11-11 | 1993-11-11 | Destruction detection method and destruction detection device by AE sound |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28273593A JP2839831B2 (en) | 1993-11-11 | 1993-11-11 | Destruction detection method and destruction detection device by AE sound |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07134060A JPH07134060A (en) | 1995-05-23 |
| JP2839831B2 true JP2839831B2 (en) | 1998-12-16 |
Family
ID=17656371
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28273593A Expired - Fee Related JP2839831B2 (en) | 1993-11-11 | 1993-11-11 | Destruction detection method and destruction detection device by AE sound |
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| Country | Link |
|---|---|
| JP (1) | JP2839831B2 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100355050B1 (en) * | 1999-09-22 | 2002-10-05 | 김영진 | Acoustic Emission Detector Using Digital Encoding |
| US8316712B2 (en) | 2010-11-19 | 2012-11-27 | Margan Physical Diagnostics Ltd. | Quantitative acoustic emission non-destructive inspection for revealing, typifying and assessing fracture hazards |
| CN105421326A (en) * | 2015-12-15 | 2016-03-23 | 东南大学 | Soil slope stability monitoring instrument characterized by utilization of acoustic emission technology |
| WO2021070243A1 (en) * | 2019-10-08 | 2021-04-15 | 三菱電機エンジニアリング株式会社 | State monitoring device, state monitoring system, and state monitoring method |
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1993
- 1993-11-11 JP JP28273593A patent/JP2839831B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07134060A (en) | 1995-05-23 |
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