JPH041870B2 - - Google Patents
Info
- Publication number
- JPH041870B2 JPH041870B2 JP58236408A JP23640883A JPH041870B2 JP H041870 B2 JPH041870 B2 JP H041870B2 JP 58236408 A JP58236408 A JP 58236408A JP 23640883 A JP23640883 A JP 23640883A JP H041870 B2 JPH041870 B2 JP H041870B2
- Authority
- JP
- Japan
- Prior art keywords
- time difference
- impact sound
- mesh
- impact
- difference map
- 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 - Lifetime
Links
- 238000001514 detection method Methods 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 10
- 101100400452 Caenorhabditis elegans map-2 gene Proteins 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 101150064138 MAP1 gene Proteins 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
- G01S5/18—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using ultrasonic, sonic, or infrasonic waves
- G01S5/26—Position of receiver fixed by co-ordinating a plurality of position lines defined by path-difference measurements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F41—WEAPONS
- F41J—TARGETS; TARGET RANGES; BULLET CATCHERS
- F41J5/00—Target indicating systems; Target-hit or score detecting systems
- F41J5/04—Electric hit-indicating systems; Detecting hits by actuation of electric contacts or switches
- F41J5/056—Switch actuation by hit-generated mechanical vibration of the target body, e.g. using shock or vibration transducers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F41—WEAPONS
- F41J—TARGETS; TARGET RANGES; BULLET CATCHERS
- F41J5/00—Target indicating systems; Target-hit or score detecting systems
- F41J5/06—Acoustic hit-indicating systems, i.e. detecting of shock waves
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Acoustics & Sound (AREA)
- Length Measuring Devices Characterised By Use Of Acoustic Means (AREA)
- Length Measuring Devices With Unspecified Measuring Means (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Description
【発明の詳細な説明】
〔発明の技術分野〕
本発明は、金属表面で発生した衝撃音により衝
撃位置を標定する衝撃位置標定方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an impact position locating method for locating an impact position using an impact sound generated on a metal surface.
例えば原子炉内の構造物あるいはプラント機器
の部品の脱落による衝撃音を検出することによつ
てその衝撃位置を突き止めることは従来より行な
われている。従来の衝撃位置を推定する方式とし
て複数の衝撃音検出器への衝撃波の到達時間差デ
ータを直接利用する時間差直示方式あるいは時間
差一定の２個の双曲線の交点として図示する標定
点計算方式などがある。しかしながら、前者の時
間差直示方式は原始データを利用し、標定計算に
伴なう誤差は含まない等のメリツトはあるものの
位置対応が間接的で不便であり、また、後者の標
定点計算方式は標定点が位置座標上で得られるメ
リツトはあるが、処理時間が長く、また時間差計
測誤差の影響が大きい等の欠点がある。
For example, it has been conventional practice to locate the impact position by detecting the impact sound caused by a falling part of a structure in a nuclear reactor or plant equipment. Conventional methods for estimating the impact location include a time difference direct display method that directly uses data on the difference in arrival times of shock waves to multiple impact sound detectors, and a control point calculation method that is illustrated as the intersection of two hyperbolas with a constant time difference. . However, although the former time-difference direct indication method uses original data and does not include errors associated with orientation calculations, it is inconvenient because position correspondence is indirect. Although there is an advantage that the control point can be obtained on the position coordinates, there are disadvantages such as a long processing time and a large influence of time difference measurement errors.
本発明は上記の点に鑑みてなされたもので、そ
の目的は、金属表面で発生した衝撃位置を短時間
で標定できる衝撃位置標定方法を提供するもので
ある。
The present invention has been made in view of the above points, and an object thereof is to provide an impact position locating method that can locate the impact position generated on a metal surface in a short time.
上記目的を達成するために、本発明の衝撃位置
標定方法は、標定域をメツシユ分けするとともに
当該標定域の外周部に複数対の衝撃音検出地点を
設け、前記標定域内の各メツシユと前記第１の対
の各衝撃音検出地点との間の時間差を予め計算し
て当該各メツシユごとにメモリーした第１の時間
差マツプを作成し、また前記標定域内の各メツシ
ユと前記第２の対の各衝撃音検出地点との間の時
間差を予め計算して当該各メツシユごとにメモリ
ーした第２の時間差マツプを作成しておき、衝撃
位置標定に際して、前記第１の対の各衝撃音検出
地点で検出された時間差をマークした前記第１の
時間差マツプと、前記第２の対の各衝撃音検出地
点で検出された時間差をマークした前記第２の時
間差マツプとを重ね合せ、共通にマークされてい
るメツシユを衝撃位置と標定するようにしたこと
を特徴とするものである。
In order to achieve the above object, the impact position locating method of the present invention divides the locating area into meshes, and provides a plurality of pairs of impact sound detection points on the outer periphery of the locating area, and connects each mesh in the locating area to the mesh. A first time difference map is created in which the time difference between each of the first pair of impact sound detection points is calculated in advance and memorized for each mesh, and a first time difference map is created in which the time difference between each of the meshes in the orientation area and each of the second pair is stored. A second time difference map is created in which the time difference between the impact sound detection point and the impact sound detection point is calculated in advance and memorized for each mesh. The first time difference map marking the time difference detected at each impact sound detection point of the second pair is superimposed on the second time difference map marking the time difference detected at each impact sound detection point of the second pair, and the two time difference maps are commonly marked. This is characterized by locating the mesh as the impact position.
本発明の一実施例を図面を参照して説明する。 An embodiment of the present invention will be described with reference to the drawings.
先ず、時間差マツプの作成について説明する。 First, creation of a time difference map will be explained.
第１図に示すように、標定域Ａを適当な大きさ
のメツシユに区分し、この標定域Ａを囲む地点
ａ，ｂ，ｃ，ｄにそれぞれ衝撃音検出器Da，Db，
Dc，Ddを配置する。 As shown in Figure 1, the location area A is divided into meshes of appropriate size, and impact sound detectors D a , D b ,
Place D c and D d .
例えば、メツシユMiで衝撃音が発生したとき
地点ａ，ｂにそれぞれ配置された衝撃音検出器
Da，Dbで検出される衝撃音の時間差△t1iは下記
(1)式となる。 For example, when an impact sound occurs in Metsu Mi, impact sound detectors are placed at points a and b.
The time difference △t 1i between the impact sounds detected at D a and D b is as follows:
Equation (1) is obtained.
△t1i＝lai−lbi／Ｃ ……(1)
たゞし、lai、lbiはメツシユMiと地点ａまたは
ｂ間の距離、ｃは音速、lai、lbiは容易に測定され
るし、音速Ｃは既知であるから時間差△t1iは簡単
に計算することができる。 △t 1i = l ai - l bi /C ...(1) Therefore, l ai and l bi are the distances between mesh Mi and point a or b, c is the speed of sound, and l ai and l bi can be easily measured. Since the sound speed C is known, the time difference Δt 1i can be easily calculated.
このようにして、標定域Ａ内の各メツシユMi
に対応する衝撃音検出地点ａ，ｂの検出時間差△
t1iを計算し、この値をその各メツシユにメモリす
ることにより時間差マツプが作成される。 In this way, each mesh Mi in the orientation area A
Detection time difference between impact sound detection points a and b corresponding to △
A time difference map is created by calculating t 1i and storing this value in each mesh.
同様に、メツシユMiで衝撃音が発生したとき
衝撃音検出地点ｃ，ｄにそれぞれ配置された衝撃
音検出器Dc，Ddで検出される衝撃音の時間差△
t2iは下記(2)式となる。 Similarly, when an impact sound occurs at mesh Mi, the time difference △ between the impact sounds detected by impact sound detectors D c and D d placed at impact sound detection points c and d, respectively.
t 2i is expressed by the following equation (2).
△t2i＝lci−ldi／Ｃ ……(2)
たゞしlci、ldiはメツシユMiと地点ｃ，ｄ間の距
離、ｃは音速、したがつて標定域Ａ内の各メツシ
ユMiに対する衝撃音検出地点ｃ，ｄの検出時間
差△t2iは上記△t1iの場合と同様に計算し、この値
をその各メツシユにメモリすることにより時間差
マツプ２が作成される。 △t 2i = l ci − l di /C (2) where l ci and l di are the distances between mesh M i and points c and d, and c is the speed of sound. The detection time difference Δt 2i between the impact sound detection points c and d with respect to the mesh Mi is calculated in the same manner as in the case of Δt 1i above, and the time difference map 2 is created by storing this value in each mesh.
次に、衝撃音発生位置の標定方法について説明
する。金属表面の標定域Ａ内において衝撃音が発
生し、検出地点ａ，ｂに配置した衝撃音検出器
Da，Dbから両検出器Da，Dbの検出時間差△t1を
求め、この時間差△t1を上記時間差マツプ１上の
対応するメツシユすべてに第２図イに示すように
マークする。また、上記の衝撃音を検出地点ｃ，
ｄに配置した衝撃音検出器Dc，Ddで検出し、両
検出器Dc，Ddの検出時間差△t2を求め、この時間
差△t2を上記時間差マツプ２上の対応するメツシ
ユすべてに第２図ロに示すようにマークする。時
間差マツプ１と時間差マツプ２を重ね合わせる
と、第２図ハに示すように共通にマークされたメ
ツシユが求まるので、このメツシユを衝撃音発生
位置として標定する。 Next, a method for locating the impact sound generation position will be explained. An impact sound is generated within the location area A of the metal surface, and impact sound detectors are placed at detection points a and b.
Find the detection time difference △t 1 between both detectors D a and D b from D a and D b , and mark this time difference △t 1 on all the corresponding meshes on the time difference map 1 as shown in Figure 2 A. . In addition, the above impact sound was detected at point c,
The impact sound is detected by the impact sound detectors D c and D d placed at d, and the detection time difference △t 2 between both detectors D c and D d is calculated. This time difference △t 2 is calculated from all the corresponding meshes on the above time difference map 2. Mark as shown in Figure 2 B. When time difference map 1 and time difference map 2 are superimposed, a commonly marked mesh is found as shown in FIG. 2C, and this mesh is located as the impact sound generation position.
なお、上記した時間差マツプ作成、衝撃音発生
位置標定についてはいずれも簡単な計算であるの
で、市販の計算機を用いて演算されるもので、そ
の手順は既に説明したところと同一であるが第３
図に衝撃位置標定のフロチヤートとしてまとめて
示した。 Note that the above-mentioned time difference map creation and impact sound generation position location are both simple calculations, so they are calculated using a commercially available calculator, and the procedures are the same as those already explained, but
The diagram summarizes the impact location as a flowchart.
上記実施例では衝撃音検出器は４個の場合で説
明したが、少くとも３個以上の衝撃音検出器が配
置されれば衝撃音発生位置を標定できる。また、
衝撃音検出器は標定域を囲む任意の地点でよいこ
とは勿論である。 In the above embodiment, the case where there are four impact sound detectors has been described, but if at least three or more impact sound detectors are arranged, it is possible to locate the impact sound generation position. Also,
Of course, the impact sound detector may be located at any point surrounding the location area.
以上説明したように、本発明の衝撃位置標定方
法によれば、一対の衝撃音検出器の時間差を時間
座マツプに記録したものを２枚用意するのみでよ
いので、衝撃点標定の処理が簡単であり、標定時
間も短くてすみ、また、予め作成する時間差マツ
プも各メツシユと衝撃音検出器間の最短距離およ
び音速だけで計算できるので、複雑な形状の標定
域でも比較的簡単に作成できる。しかも、実際の
場所と各メツシユが対応しているので、内部観察
することのできない例えば圧力容器内のルースパ
ーツモニターとして優れた効果を奏する。
As explained above, according to the impact position locating method of the present invention, it is only necessary to prepare two time maps in which the time difference between a pair of impact sound detectors is recorded, so the impact point locating process is simple. Therefore, the orientation time is short, and the time difference map created in advance can be calculated using only the shortest distance between each mesh and the impact sound detector and the sound speed, so it can be created relatively easily even in a orientation area with a complex shape. . Moreover, since each mesh corresponds to the actual location, it is effective as a loose parts monitor inside a pressure vessel, for example, where the interior cannot be observed.
第１図は本発明の時間差マツプ作成のための説
明図、第２図は本発明の時間マツプを用いて衝撃
音発生位置を標定するための説明図、第３図は、
衝撃位置標定のフローチヤートである。
Ａ……標定域、ａ，ｂ，ｃ，ｄ……衝撃音検出
器設定地点、Da，Db，Dc，Dd……衝撃音検出器。
FIG. 1 is an explanatory diagram for creating a time difference map according to the present invention, FIG. 2 is an explanatory diagram for locating the impact sound generation position using the time map according to the present invention, and FIG.
This is a flowchart for locating the impact position. A... Location area, a, b, c, d... Impact sound detector setting point, D a , D b , D c , D d ... Impact sound detector.
Claims (1)
域の外周部に複数対の衝撃音検出地点を設け、前
記標定域内の各メツシユと前記第１の対の各衝撃
音検出地点との間の時間差を予め計算して当該各
メツシユごとにメモリーした第１の時間差マツプ
を作成し、また前記標定域内の各メツシユと前記
第２の対の各衝撃音検出地点との間の時間差を予
め計算して当該各メツシユごとにメモリーした第
２の時間差マツプを作成しておき、衝撃位置標定
に際して、前記第１の対の各衝撃音検出地点で検
出された時間差をマークした前記第１の時間差マ
ツプと、前記第２の対の各衝撃音検出地点で検出
された時間差をマークした前記第２の時間差マツ
プとを重ね合せ、共通にマークされているメツシ
ユを衝撃位置と標定するようにしたことを特徴と
する衝撃位置標定方法。1 Divide the orientation area into meshes and provide multiple pairs of impact sound detection points on the outer periphery of the orientation area, and calculate the time difference in advance between each mesh within the orientation area and each impact sound detection point of the first pair. A first time difference map is calculated and stored for each mesh, and a time difference between each mesh in the orientation area and each impact sound detection point of the second pair is calculated in advance and A second time difference map memorized for each mesh is created, and when locating the impact position, the first time difference map marks the time difference detected at each impact sound detection point of the first pair, and The second time difference map, which marks the time difference detected at each of the two pairs of impact sound detection points, is superimposed on the second time difference map, and the commonly marked mesh is located as the impact position. Location method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23640883A JPS60128375A (en) | 1983-12-16 | 1983-12-16 | Spotting method of impact position |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23640883A JPS60128375A (en) | 1983-12-16 | 1983-12-16 | Spotting method of impact position |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60128375A JPS60128375A (en) | 1985-07-09 |
| JPH041870B2 true JPH041870B2 (en) | 1992-01-14 |
Family
ID=17000309
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23640883A Granted JPS60128375A (en) | 1983-12-16 | 1983-12-16 | Spotting method of impact position |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60128375A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2682608A1 (en) * | 1991-10-17 | 1993-04-23 | Rousseau Claude | Device for determining the position of impact of a projectile, particularly a golf ball, on a target panel |
| JP2015528119A (en) | 2012-07-31 | 2015-09-24 | ゼネラル・エレクトリック・カンパニイ | Method and system for determination of geometric features in objects |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4918090A (en) * | 1972-04-12 | 1974-02-18 | ||
| JPS5429698A (en) * | 1977-08-10 | 1979-03-05 | Hitachi Ltd | Two-dimensional position evaluating method of sound producing source in hollow materials |
| JPS5585269A (en) * | 1978-12-23 | 1980-06-27 | Nippon Ii T L Kk | Device for ranging sound source and the like |
-
1983
- 1983-12-16 JP JP23640883A patent/JPS60128375A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4918090A (en) * | 1972-04-12 | 1974-02-18 | ||
| JPS5429698A (en) * | 1977-08-10 | 1979-03-05 | Hitachi Ltd | Two-dimensional position evaluating method of sound producing source in hollow materials |
| JPS5585269A (en) * | 1978-12-23 | 1980-06-27 | Nippon Ii T L Kk | Device for ranging sound source and the like |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60128375A (en) | 1985-07-09 |
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