JPH06300667A - Method and equipment for detecting abnormality of valve rod - Google Patents
Method and equipment for detecting abnormality of valve rodInfo
- Publication number
- JPH06300667A JPH06300667A JP5091476A JP9147693A JPH06300667A JP H06300667 A JPH06300667 A JP H06300667A JP 5091476 A JP5091476 A JP 5091476A JP 9147693 A JP9147693 A JP 9147693A JP H06300667 A JPH06300667 A JP H06300667A
- Authority
- JP
- Japan
- Prior art keywords
- valve stem
- valve rod
- frequency
- natural frequency
- 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.)
- Pending
Links
Landscapes
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
- Details Of Valves (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、原子力設備における
弁の弁棒異常検出方法およびその検出装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve stem abnormality detecting method for a valve in a nuclear facility and a detecting apparatus therefor.
【０００２】[0002]
【従来の技術】原子力発電プラントは約１万台の弁によ
り構成されており、圧力バウンダリを構成したり、流量
の調節を行なう等の重要な役割を果している。これらの
弁は、運転中流体振動や熱応力の発生等の機械的、熱的
ストレスに晒されており、これらの状況の点検にはその
弁数が膨大であるがために多くの時間と労力を必要とす
る。2. Description of the Related Art A nuclear power plant is composed of about 10,000 valves and plays important roles such as forming a pressure boundary and adjusting a flow rate. These valves are exposed to mechanical and thermal stresses such as fluid vibration and thermal stress generation during operation.To check these conditions, the number of valves is enormous. Need.
【０００３】弁におけるトラブルの中でも弁棒に発生す
る亀裂等の異常は弁にとって致命的とも言えるものであ
り、特に電動弁は開弁時においてもリークを防ぐために
トルクをかけてバックシートしているためこの部分に応
力が集中し、亀裂が発生し易く、この亀裂が発達すると
弁棒の折損に至ることもある。Abnormalities such as cracks occurring in the valve rod are fatal to the valve among troubles in the valve, and in particular, the motor-operated valve has a back seat with a torque applied to prevent leakage even when the valve is opened. Therefore, stress concentrates on this portion, and a crack is likely to occur. If this crack develops, the valve stem may be broken.
【０００４】このような弁棒の異常を早期に検知する手
段としては、従来では弁を分解し、バックシート部に超
音波探傷試験、磁粉探傷試験、浸透探傷試験等の非破壊
試験を行なうことに依っている。As a means for early detecting such valve rod abnormality, the valve is conventionally disassembled and a non-destructive test such as an ultrasonic flaw detection test, a magnetic particle flaw detection test, and a penetration flaw detection test is performed on the back sheet portion. Depends on.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、従来の
弁棒異常検出方法や手段では、弁棒の亀裂の発生の有無
を正確に検査することはできても、その弁棒検査に要す
る作業量や作業時間が著しく多く掛かり、また弁の分解
時における放射能の被曝量も多く、作業員に加わる負荷
が大きくなるという問題点があり、しかも点検すること
ができる弁数に制限を受ける等の問題点がある。However, although the conventional valve stem abnormality detecting method and means can accurately inspect for the presence or absence of cracks in the valve stem, the amount of work required for the valve stem inspection and the amount of work required for the inspection. There is a problem that the work time is remarkably long, the radiation dose is large when the valve is disassembled, and the load on the worker is large, and the number of valves that can be inspected is limited. There is a point.
【０００６】この発明は、弁を分解することなく弁棒の
亀裂発生等の異常を検知することができ、安全で高能率
に異常の発見を達成することができる弁棒異常検出方法
およびその検出装置を提供することを目的とする。The present invention can detect abnormalities such as cracks in the valve stem without disassembling the valve, and can safely and efficiently detect abnormalities in the valve stem and its detection. The purpose is to provide a device.
【０００７】[0007]
【課題を解決するための手段】上述した課題を解決する
ため、この発明に係る弁棒異常検出方法では、請求項１
に記載したように、弁棒点検時に弁棒に加速度センサを
取り付け、次いで弁棒を打診して横振動の固有振動数を
数次以上の高次まで求め、求められた固有振動数を正常
時に予め求めた固有振動数と比較してその比較結果に変
化があるとき異常と診断する方法である。In order to solve the above-mentioned problems, the valve stem abnormality detecting method according to the present invention comprises:
As described in, the accelerometer is attached to the valve stem during the valve stem inspection, and then the valve stem is struck to find the natural frequency of lateral vibration up to several orders of magnitude or higher. This is a method of comparing with a previously determined natural frequency and diagnosing an abnormality when there is a change in the comparison result.
【０００８】また、この発明に係る弁棒異常検出方法で
は、上述した課題を解決するため、請求項１に記載した
方法に加え請求項２に記載したように、上記各振動モー
ドの固有振動数の減少率を算出することにより弁棒の亀
裂等損傷の程度および損傷箇所を推定する方法である。According to the valve rod abnormality detecting method of the present invention, in order to solve the above-mentioned problems, in addition to the method described in claim 1, as described in claim 2, the natural frequency of each vibration mode is This is a method of estimating the degree of damage such as cracks in the valve stem and the damaged portion by calculating the reduction rate of.
【０００９】さらに、上述した課題を解決するため、こ
の発明に係る弁棒異常検出装置では、請求項３に記載し
たように、弁棒の上端に取り付けられる加速度センサか
ら加速度信号を受ける振動検出部と、弁棒の形状を入力
することにより弁棒の理論上の横振動の固有振動数を算
出し正常時の周波数分析結果から各振動モードに対応す
る周波数ピークを同定する解析部と、点検時の検出信号
を周波数分析して横振動の固有振動数を求めて正常時に
おけるデータと比較する比較部と、２つの状態の固有振
動数の減少率を各モードについて求める演算部と、その
結果から亀裂損傷発生箇所およびその程度を推定する診
断部とを有するものである。Further, in order to solve the above-mentioned problems, in the valve stem abnormality detecting device according to the present invention, as described in claim 3, a vibration detecting section which receives an acceleration signal from an acceleration sensor attached to the upper end of the valve stem. By inputting the shape of the valve stem, the theoretical natural frequency of the lateral vibration of the valve stem is calculated, and the analysis part that identifies the frequency peak corresponding to each vibration mode from the frequency analysis result under normal conditions, and at the time of inspection The frequency of the detection signal is analyzed to obtain the natural frequency of the lateral vibration and compared with the data under normal conditions, the calculation unit that calculates the rate of decrease of the natural frequency of the two states for each mode, and the result It has a crack damage occurrence place and a diagnosis unit for estimating the degree thereof.
【００１０】[0010]
【作用】上記により弁棒をハンマリング等により打診
し、弁棒の上端に取り付けた加速度センサによりその振
動を測定し、これを周波数分析して弁棒の横振動の固有
振動数を得、予め求めてある正常時の振動数と比較する
ことによって弁棒の亀裂の発生を検知し、さらに各モー
ドの周波数減少率を算出することにより、そのパターン
から亀裂の発生箇所および亀裂の程度を推定することが
できる。[Function] As described above, the valve stem is struck by hammering or the like, its vibration is measured by the acceleration sensor attached to the upper end of the valve stem, and the frequency is analyzed to obtain the natural frequency of the lateral vibration of the valve stem. The occurrence of cracks in the valve stem is detected by comparing it with the obtained normal frequency, and the location of cracks and the extent of cracks are estimated from the pattern by calculating the frequency reduction rate for each mode. be able to.
【００１１】[0011]
【実施例】以下この発明の実施例を図面について説明す
る。Embodiments of the present invention will now be described with reference to the drawings.
【００１２】図１はこの発明の一実施例を示す構成図で
あり、弁棒１の上端に取り付けられる加速度センサから
加速度信号を受ける振動検出部２と、弁棒１の形状入力
部３から形状入力することにより弁棒１の理論上の横振
動の固有振動数を算出する固有振動数算出部４と、周波
数分析部５、点検時の検出信号を周波数分析して横振動
の固有振動数を数次、例えば６次以上の高次まで求めて
正常時のデータと比較する比較部６と、２つの状態の固
有振動数の減少率を各モードについて求める演算部７
と、固有振動数同定部８と、前記演算部７の演算結果か
ら亀裂発生箇所や程度を推定する診断部としての表示部
９等からなっいてる。FIG. 1 is a block diagram showing an embodiment of the present invention, in which a shape is formed from a vibration detecting portion 2 which receives an acceleration signal from an acceleration sensor attached to an upper end of a valve rod 1 and a shape input portion 3 of the valve rod 1. The natural frequency calculation unit 4 for calculating the theoretical natural frequency of the lateral vibration of the valve rod 1 by inputting it, the frequency analysis unit 5, and the frequency analysis of the detection signal at the time of inspection to determine the natural frequency of the lateral vibration. A comparison unit 6 that obtains several orders, for example, higher than 6th order and compares with normal data, and an operation unit 7 that obtains the reduction rate of the natural frequency of two states for each mode.
And a natural frequency identifying section 8 and a display section 9 as a diagnostic section for estimating the crack occurrence location and degree from the calculation result of the calculating section 7.
【００１３】プラント点検時には、弁棒１の上端に加速
度センサを取り付け、弁棒１をインパルスハンマ等で打
撃してそのときの振動を測定し、測定信号を振動検出部
２へ入力させる。こうして得られた振動データを周波数
分析部５により周波数を分析し、その結果得られた周波
数ピークは弁棒１の縦振動、横振動の１次〜ｎ次（例え
ば６次以上）の固有振動数に相当する。なお周波数分析
に際しては、ハンマリング時のばらつきを防ぐため複数
回打診し、その平均値を採ることが望ましい。上記の試
験は、弁開度が全開あるいは全閉の場合は弁棒１の支持
条件が複雑になるため、自由端で弁棒１が振動する中間
弁開度で行なうようにする。また打診しても振動が検出
し得ない場合にはパッキンを緩めるか、あるいは外した
状態で行なう。At the time of plant inspection, an acceleration sensor is attached to the upper end of the valve rod 1, the valve rod 1 is struck with an impulse hammer or the like to measure the vibration at that time, and a measurement signal is input to the vibration detection unit 2. The frequency data of the vibration data thus obtained is analyzed by the frequency analysis unit 5, and the frequency peak obtained as a result is the natural frequency of the first to nth order (for example, 6th order or more) of longitudinal vibration and lateral vibration of the valve rod 1. Equivalent to. In the frequency analysis, it is desirable to take a plurality of medical examinations and take the average value thereof in order to prevent variations during hammering. When the valve opening is fully open or fully closed, the above-mentioned test is performed at an intermediate valve opening in which the valve rod 1 vibrates at the free end because the supporting conditions of the valve rod 1 become complicated. If vibration cannot be detected even after percussion, the packing should be loosened or removed.
【００１４】弁の診断を行なうために必要な正常時の固
有振動数は、設計情報から弁棒１の形状を形状入力部３
へ入力することにより理論上の固有振動数を固有振動数
算出部４で算出し、その結果と正常時に前記のように打
診して得た実際の周波数ピークとを比較部６において比
較し、横振動および縦振動の１次〜ｎ次の固有振動数を
各々同定部８において同定する。なお弁棒の正常時の固
有振動数は、弁の組立前に弁棒単体での打診試験を行な
うことが望ましい。但し、既設の弁の場合は、これが不
可能であるため、前述したような試験方法によることに
なる。また得られた正常時の固有振動数データベース
は、弁棒１の形状毎にフロッピーディスクに収める等の
方法によって管理することにより簡便に多数の弁の診断
を行なうことができる。As for the natural frequency at the normal time necessary for diagnosing the valve, the shape of the valve rod 1 can be calculated from the design information based on the shape input section 3
The theoretical natural frequency is calculated by the natural frequency calculation section 4 by inputting the result into the comparison section 6, and the result is compared with the actual frequency peak obtained by percussion as described above in the normal state in the comparison section 6, The first to nth natural frequencies of vibration and longitudinal vibration are identified by the identifying unit 8. For the natural frequency of the valve rod under normal conditions, it is desirable to perform a percussion test on the valve rod alone before assembling the valve. However, in the case of an existing valve, this is not possible, so the test method as described above will be used. Also, the obtained natural frequency database under normal conditions can be easily diagnosed for a large number of valves by managing the shape of the valve rod 1 by storing it in a floppy disk.
【００１５】弁の診断に際しては、前述の試験によって
数次、例えば６次以上の固有振動数を抽出し、その結果
とデータベースとを比較部６により比較し、変化があれ
ば異常と診断することになる。またそれぞれの周波数の
変化の状態により亀裂の発生箇所の推定を演算部７の推
定器で行ない、その診断結果は結果表示部９に表示され
る。When diagnosing a valve, natural frequencies of several orders, for example, 6th order or higher are extracted by the above-mentioned test, and the results are compared with the database by the comparison unit 6, and if there is a change, it is diagnosed as abnormal. become. Further, the estimator of the arithmetic unit 7 estimates the location of the crack depending on the change state of each frequency, and the diagnostic result is displayed on the result display unit 9.
【００１６】次に本実施例における演算処理方法の一例
を説明する。Next, an example of the arithmetic processing method in this embodiment will be described.
【００１７】弁棒の縦振動の固有振動数ｆ1 は次式で表
わされる。The natural frequency f1 of the vertical vibration of the valve rod is expressed by the following equation.
【００１８】[0018]
【数１】 ここで、ｌは弁棒の長さ（cm）、Ｅは弁棒の縦弾性係数
（kg／cm2 ）、γは単位体積の重量（kg／cm3 ）、ｇは
重力加速度（kgｍ/sec2 ）、λは振動数係数である。[Equation 1] Where l is the length of the valve stem (cm), E is the longitudinal elastic modulus of the valve stem (kg / cm 2 ), γ is the weight per unit volume (kg / cm 3 ), and g is the acceleration of gravity (kgm / sec). 2 ) and λ are frequency coefficients.
【００１９】また横振動の場合の固有振動数ｆ2 は次式
で表わされる。Further, the natural frequency f2 in the case of lateral vibration is expressed by the following equation.
【００２０】[0020]
【数２】 ここで、Ｉは振動方向に直角な主軸に関する断面２次モ
ーメント（cm4 ）、Ａは断面積（cm2 ）である。[Equation 2] Here, I is the second moment of area (cm 4 ) about the principal axis perpendicular to the vibration direction, and A is the cross-sectional area (cm 2 ).
【００２１】したがって、弁棒に亀裂が発生した場合、
弁棒の曲げ剛さ（ＥＩ）が低下するため固有振動数が減
少することが上記数式（２）から明らかである。また縦
振動で弁棒の長さｌが変化すると考えると、数式（１）
からやはり固有振動数が変化するが、横振動の変化の方
がより大きいため横振動を評価に用いることで信頼性の
高い診断を行なうことができる。Therefore, when a crack is generated in the valve rod,
It is clear from the above mathematical formula (2) that the bending frequency (EI) of the valve rod decreases and the natural frequency decreases. Further, considering that the length l of the valve rod changes due to the longitudinal vibration, the mathematical formula (1)
Therefore, the natural frequency also changes, but since the change in lateral vibration is larger, it is possible to perform highly reliable diagnosis by using lateral vibration for evaluation.
【００２２】図１における弁棒形状入力部３では、診断
しようとする弁棒のＩ，Ｅ等の形状および材料に関する
データを入力し、数式（１），（２）を用いることによ
り理論上の固有振動数が算出される。また弁棒１の形状
は単純な一様断面の梁と見做すことができるので、上記
の数式により比較的現実の固有振動に近い値を比較的容
易に導出することができる。In the valve stem shape input section 3 in FIG. 1, data relating to the shape and material such as I and E of the valve stem to be diagnosed is inputted, and theoretical formulas are obtained by using the mathematical expressions (1) and (2). The natural frequency is calculated. Further, since the shape of the valve rod 1 can be regarded as a beam having a simple uniform cross section, a value relatively close to the actual natural vibration can be derived relatively easily by the above mathematical formula.
【００２３】実際の固有振動数は、前述の打診試験によ
って周波数ピークを抽出して数次以上、例えば６次以上
を求め、求められた数次の固有振動数を前述の方法で得
られた理論値と比較し、最も近い値を選び出すことによ
って横振動および縦振動の１次〜ｎ次、好ましくは６次
以上の固有振動数を同定することができる。このデータ
により横振動固有振動数のみを抽出して記憶させ、診断
に用いられる。The actual natural frequency is obtained by extracting the frequency peak by the above-mentioned percussion test to obtain several or more orders, for example, six or more orders, and the obtained natural frequencies of several orders are obtained by the theory described above. By comparing the values with the values and selecting the closest value, it is possible to identify the natural frequencies of the 1st to nth order of the lateral vibration and the longitudinal vibration, preferably the 6th order or more. Based on this data, only the lateral vibration natural frequency is extracted and stored and used for diagnosis.
【００２４】図２は診断部でのフローチャートを示して
いる。このフローチャートは、点検時に前記の打診試験
によって得られたデータを正常時の固有振動数と比較
し、図３（Ａ）に示すように、得られた周波数ｆｉが正
常時の固有振動数Ｆｉに較べて減少する場合に「亀裂発
生」と診断する。異常のない場合にはその旨が表示され
る。FIG. 2 shows a flow chart in the diagnosis section. This flow chart compares the data obtained by the percussion test at the time of inspection with the natural frequency in the normal state, and as shown in FIG. 3 (A), the obtained frequency fi becomes the natural frequency Fi in the normal state. If the number decreases compared to the other, it is diagnosed as "cracking". If there is no abnormality, a message to that effect is displayed.
【００２５】異常有りと診断されると、各振動モードの
固有振動数の減少率を各々算出し、図３（Ｂ）のように
整理する。固有振動数の変化の割合は亀裂の発生部位
（箇所）が振動の腹にあたる場合が多く、節にあたる場
合は少ない。したがって、この図は各振動モードの亀裂
の発生箇所が振動の腹であるか節であるかを示してお
り、亀裂発生箇所（場所）に関する情報を含んでいる。When it is diagnosed that there is an abnormality, the rate of decrease of the natural frequency of each vibration mode is calculated and arranged as shown in FIG. 3 (B). The rate of change in natural frequency is often that the crack occurrence site (location) is the antinode of vibration, and is low when it is a node. Therefore, this figure shows whether the crack occurrence place in each vibration mode is the antinode or node of the vibration, and includes information about the crack occurrence place (location).
【００２６】亀裂が弁棒の全長の１／２，１／４，１／
６の部分に発生した場合の特徴を図４（Ａ）〜（Ｃ）に
示している。この図４（Ａ）〜（Ｃ）に示すように亀裂
の発生箇所に応じてそれぞれ特徴を示す。よって固有振
動数の減少率をｆｎとｆｎ−１とで比較し、（ｆｎの減
少率）＜（ｆｎ−１の減少率）となるｎを求めることに
より弁棒のｌ／ｎの部分に亀裂が発生していることとな
り、亀裂発生部位（箇所）を診断することができる。ま
た図５に示すように固有振動数の減少率は亀裂部の面積
に依存することによりこのようなデータを記憶部に記憶
させ、これを参照することによって亀裂の程度を求める
ことができる。The cracks are 1/2, 1/4, 1 / of the entire length of the valve rod.
The characteristics when they occur in the portion 6 are shown in FIGS. 4 (A) to 4 (C). As shown in FIGS. 4 (A) to 4 (C), features are shown depending on the location where the crack is generated. Therefore, by comparing the reduction rate of the natural frequency between fn and fn-1, and obtaining n such that (reduction rate of fn) <(reduction rate of fn-1), cracks occur at the 1 / n portion of the valve stem. Therefore, it is possible to diagnose the crack occurrence site (location). Further, as shown in FIG. 5, the rate of decrease in natural frequency depends on the area of the crack portion, so that such data is stored in the storage portion, and the degree of the crack can be obtained by referring to this data.
【００２７】[0027]
【発明の効果】以上のようにこの発明によれば、弁棒を
打診してその加速度を測定することにより周波数を分析
し、横振動の固有振動数を数次以上に亘って求め、求め
られた固有振動数と正常時とのデータを比較することに
よって弁棒の亀裂発生等の異常の検出ができると同時に
正常時との固有振動数の変化の割合から亀裂等の損傷発
生場所の特定をも行なうことができる。またこの弁の診
断は弁を分解することなく行なえるので、作業員の被曝
量を軽減し、安全で高能率に異常の発見を行なうことが
できる。As described above, according to the present invention, the frequency is analyzed by striking the valve rod and measuring its acceleration, and the natural frequency of the lateral vibration is obtained and obtained over several orders. It is possible to detect abnormalities such as the occurrence of cracks in the valve stem by comparing the natural frequency and the normal time data, and at the same time identify the location of damage such as cracks from the rate of change in the natural frequency from the normal time. Can also be done. Further, since the valve can be diagnosed without disassembling the valve, it is possible to reduce the exposure dose of the worker and to detect the abnormality safely and with high efficiency.
【図面の簡単な説明】[Brief description of drawings]
【図１】この発明に係る弁棒異常検出装置の一実施例を
示す構成図。FIG. 1 is a configuration diagram showing an embodiment of a valve stem abnormality detecting device according to the present invention.
【図２】弁棒の損傷診断のフローチャート。FIG. 2 is a flowchart of valve stem damage diagnosis.
【図３】（Ａ），（Ｂ）は亀裂発生時の解析例を示すグ
ラフ。3A and 3B are graphs showing an example of analysis when a crack occurs.
【図４】（Ａ）〜（Ｃ）は亀裂発生場所による周波数減
少率のパターンを示すグラフ。FIG. 4A to FIG. 4C are graphs showing patterns of frequency reduction rate depending on a crack generation place.
【図５】亀裂部の断面積と固有振動数減少率を示すグラ
フ。FIG. 5 is a graph showing a cross-sectional area of a crack portion and a natural frequency reduction rate.
１ 弁棒 ２ 振動検出部 ３ 弁棒形状入力部 ４ 固有振動数算出部 ５ 周波数分析部 ６ 比較部 ７ 演算部 ８ 固有振動数同定部 ９ 表示部 １０ 記憶部 DESCRIPTION OF SYMBOLS 1 valve rod 2 vibration detection unit 3 valve rod shape input unit 4 natural frequency calculation unit 5 frequency analysis unit 6 comparison unit 7 calculation unit 8 natural frequency identification unit 9 display unit 10 storage unit
───────────────────────────────────────────────────── フロントページの続き (72)発明者 一森 康文 神奈川県横浜市磯子区新杉田町８番地 株 式会社東芝横浜事業所内 (72)発明者 高山 拓治 神奈川県横浜市磯子区新杉田町８番地 株 式会社東芝横浜事業所内 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yasufumi Ichimori 8th Shinsugita-cho, Isogo-ku, Yokohama-shi, Kanagawa Stock company Toshiba Yokohama office (72) Inventor Takuji Takayama 8th Shinsugita-cho, Isogo-ku, Yokohama-shi, Kanagawa Ceremony company Toshiba Yokohama office
Claims (3)
付け、次いで弁棒を打診して横振動の固有振動数を数次
以上の高次まで求め、求められた固有振動数を正常時に
予め求めた固有振動数と比較してその比較結果に変化が
あるとき異常と診断することを特徴とする弁棒異常検出
方法。1. When a valve stem is inspected, an acceleration sensor is attached to the valve stem, and then the valve stem is struck to obtain natural frequencies of lateral vibration up to several orders of magnitude or higher. A method for detecting a valve stem abnormality, which comprises diagnosing an abnormality when a comparison result is changed in comparison with the obtained natural frequency.
を算出することにより弁棒の亀裂等損傷の程度および損
傷箇所を推定することを特徴とする請求項１記載の弁棒
異常検出方法。2. The valve stem abnormality detecting method according to claim 1, wherein the degree of damage such as a crack of the valve stem and the damaged portion are estimated by calculating the reduction rate of the natural frequency of each vibration mode. .
サから加速度信号を受ける振動検出部と、弁棒の形状を
入力することにより弁棒の理論上の横振動の固有振動数
を算出し正常時の周波数分析結果から各振動モードに対
応する周波数ピークを同定する解析部と、点検時の検出
信号を周波数分析して横振動の固有振動数を求めて正常
時におけるデータと比較する比較部と、２つの状態の固
有振動数の減少率を各モードについて求める演算部と、
その結果から亀裂損傷発生箇所およびその程度を推定す
る診断部とを有することを特徴とする弁棒異常検出装
置。3. A vibration detecting section which receives an acceleration signal from an acceleration sensor attached to the upper end of the valve stem, and a theoretical natural frequency of the lateral transverse vibration of the valve stem is calculated by inputting the shape of the valve stem. An analysis unit that identifies the frequency peak corresponding to each vibration mode from the frequency analysis result of, and a comparison unit that frequency-analyzes the detection signal at the time of inspection to obtain the natural frequency of lateral vibration and compares it with the data at normal time, An arithmetic unit that obtains the reduction rate of the natural frequency in two states for each mode;
A valve stem abnormality detecting device, comprising: a crack damage occurrence location and a diagnostic unit for estimating the extent thereof from the result.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5091476A JPH06300667A (en) | 1993-04-19 | 1993-04-19 | Method and equipment for detecting abnormality of valve rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5091476A JPH06300667A (en) | 1993-04-19 | 1993-04-19 | Method and equipment for detecting abnormality of valve rod |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06300667A true JPH06300667A (en) | 1994-10-28 |
Family
ID=14027457
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5091476A Pending JPH06300667A (en) | 1993-04-19 | 1993-04-19 | Method and equipment for detecting abnormality of valve rod |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06300667A (en) |
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| JP2005233709A (en) * | 2004-02-18 | 2005-09-02 | Tottori Univ | Crack sensing device of structure |
| JP2007278894A (en) * | 2006-04-07 | 2007-10-25 | Nsk Ltd | Device and method for diagnosing abnormality |
| GB2478087A (en) * | 2006-04-21 | 2011-08-24 | Flowserve Man Co | Rotary encoder frequency analysis |
| US8471194B2 (en) | 2006-04-21 | 2013-06-25 | Flowserve Management Company | Rotary encoder for diagnosing problems with rotary equipment |
| US9086335B2 (en) | 2006-04-21 | 2015-07-21 | Flowserve Management Company | Rotary encoder frequency analysis |
| CN104931242A (en) * | 2015-05-28 | 2015-09-23 | 扬中市第一蝶阀厂有限公司 | Fault detection method for detecting whether regulating valve can reach rated stroke |
| JP2017106893A (en) * | 2015-11-30 | 2017-06-15 | ユカインダストリーズ株式会社 | Method and device for diagnosing abnormality and deterioration in transformer |
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| JP2019143808A (en) * | 2013-04-09 | 2019-08-29 | フィッシャー コントロールズ インターナショナル リミテッド ライアビリティー カンパニー | Intelligent actuator and method for monitoring health and integrity of actuator |
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1993
- 1993-04-19 JP JP5091476A patent/JPH06300667A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005233709A (en) * | 2004-02-18 | 2005-09-02 | Tottori Univ | Crack sensing device of structure |
| JP2007278894A (en) * | 2006-04-07 | 2007-10-25 | Nsk Ltd | Device and method for diagnosing abnormality |
| GB2478087A (en) * | 2006-04-21 | 2011-08-24 | Flowserve Man Co | Rotary encoder frequency analysis |
| GB2478087B (en) * | 2006-04-21 | 2011-12-07 | Flowserve Man Co | Valve system |
| US8471194B2 (en) | 2006-04-21 | 2013-06-25 | Flowserve Management Company | Rotary encoder for diagnosing problems with rotary equipment |
| US9086335B2 (en) | 2006-04-21 | 2015-07-21 | Flowserve Management Company | Rotary encoder frequency analysis |
| JP2019143808A (en) * | 2013-04-09 | 2019-08-29 | フィッシャー コントロールズ インターナショナル リミテッド ライアビリティー カンパニー | Intelligent actuator and method for monitoring health and integrity of actuator |
| US9702754B2 (en) | 2014-03-19 | 2017-07-11 | Kabushiki Kaisha Toshiba | Inspection apparatus, and abnormality detection method |
| CN104931242A (en) * | 2015-05-28 | 2015-09-23 | 扬中市第一蝶阀厂有限公司 | Fault detection method for detecting whether regulating valve can reach rated stroke |
| JP2017106893A (en) * | 2015-11-30 | 2017-06-15 | ユカインダストリーズ株式会社 | Method and device for diagnosing abnormality and deterioration in transformer |
| KR20190007418A (en) | 2016-03-29 | 2019-01-22 | 토모에 밸브 가부시키가이샤 | Valve diagnosis method and valve diagnostic device |
| US10920907B2 (en) | 2016-03-29 | 2021-02-16 | Tomoe Valve Co., Ltd. | Valve diagnosis method and valve diagnosis device |
| JP2020204503A (en) * | 2019-06-17 | 2020-12-24 | 三菱パワー株式会社 | Anomaly detection device, anomaly detection method, and program |
| CN110411387A (en) * | 2019-07-31 | 2019-11-05 | 河海大学 | A kind of girder structure additional mass Primary Location method based on frequency |
| CN110411387B (en) * | 2019-07-31 | 2021-06-22 | 河海大学 | Frequency-based beam type structure additional mass preliminary positioning method |
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