JPH0367146A - Life diagnostic device for bearing - Google Patents
Life diagnostic device for bearingInfo
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- JPH0367146A JPH0367146A JP1204142A JP20414289A JPH0367146A JP H0367146 A JPH0367146 A JP H0367146A JP 1204142 A JP1204142 A JP 1204142A JP 20414289 A JP20414289 A JP 20414289A JP H0367146 A JPH0367146 A JP H0367146A
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- Prior art keywords
- bearing
- rate
- signal
- life
- occurrences
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- 238000003745 diagnosis Methods 0.000 claims description 13
- 238000010586 diagram Methods 0.000 description 6
- 230000002159 abnormal effect Effects 0.000 description 4
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 241000208125 Nicotiana Species 0.000 description 1
- 235000002637 Nicotiana tabacum Nutrition 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
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Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野〉
この発明は、軸受が発生するＡＥを検出するＡＥセンサ
と、このＡＥセンサからのＡＥ倍信号基準値と比較し、
ＡＥ倍信号上記基準値を越えたときに信号を出力する比
較手段とを備え、上記比較手段からの信号に基づいて上
記軸受が寿命であるか否かを判別するようにした軸受の
寿命診断装置に関する。[Detailed Description of the Invention] <Industrial Application Field> The present invention provides an AE sensor that detects AE generated by a bearing, and compares the AE multiplied signal from this AE sensor with a reference value.
Comparing means for outputting a signal when the AE multiplication signal exceeds the reference value, and determining whether the bearing has reached the end of its life based on the signal from the comparing means. Regarding.
〈従来の技術〉
従来、軸受の寿命診断装置としては軸受が発生するＡＥ
を検出するＡＥセンサと、このＡＥセンサからのＡＥ倍
信号基準値と比較し、ＡＥ倍信号上記基準値を越えたと
きに信号を出力する比較手段とを備え、上記比較手段か
らの信号の単位時間当たりの発生数、すなわち発生レー
トを算出して、例えば、第３図に示すように、この算出
した発生レートが一定のしきいレートＳＬを越えたとき
に、軸受は寿命に至ったと判別するようにしたものがあ
る。<Conventional technology> Conventionally, bearing life diagnosis devices have been used to detect AE generated by bearings.
an AE sensor that detects the AE multiplied signal from the AE sensor, and a comparing means that compares the AE multiplied signal from the AE sensor with a reference value and outputs a signal when the AE multiplied signal exceeds the reference value, and a unit of the signal from the compared means. The number of occurrences per hour, that is, the occurrence rate, is calculated and, for example, as shown in Figure 3, when this calculated occurrence rate exceeds a certain threshold rate SL, it is determined that the bearing has reached the end of its life. There is something like this.
〈発明が解決しようとする課題〉
しかしながら、」−記従来の軸受の寿命診断装置は、上
記の如く、比較手段からの信号の発生レートが一定のし
きいレートを越えたときに、軸受は寿命に至ったと判別
するようにしているので、下記の理由で軸受の寿命を安
全側に診断できないという問題があった。それは、発生
レートが一定のしきいレートを越入たときに、軸受は寿
命に至ったと判別するだけでは、軸受が、比較手段から
の信号がしきいレート以下の発生レートとなるようなＡ
Ｅを発生しながら寿命に至るような場合（第３図の（ｉ
ｉｉ））に、軸受が寿命に至ったと判別することができ
ず、致命的なダメージを軸受使用機器に与えてしまう。<Problems to be Solved by the Invention> However, in the conventional bearing life diagnosing device, as described above, when the generation rate of the signal from the comparison means exceeds a certain threshold rate, the bearing has reached its lifespan. However, there is a problem in that it is not possible to safely diagnose the life of the bearing for the following reasons. This is because simply determining that the bearing has reached the end of its life when the generation rate exceeds a certain threshold rate is not enough to prevent the bearing from generating A when the signal from the comparison means has a generation rate below the threshold rate.
In the case where the life is reached while generating E ((i) in Figure 3)
ii)) It is not possible to determine that the bearing has reached the end of its service life, resulting in fatal damage to equipment using the bearing.
そこで、この発明の目的は、寿命をより安全側に診断す
ることができる軸受の寿命診断装置を提供することにあ
る。SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a bearing life diagnosis device that can diagnose the life of a bearing more safely.
く課題を解決するための手段〉
上記目的を達成するため、この発明は、軸受の寿命診断
は、比較回路が出力する信号の発生レートのみではなく
、発生レートとこの発生レートの積分値である総発生数
に基づいて行えば寿命診断がより安全側に行えることに
着目してなされた。Means for Solving the Problems To achieve the above object, the present invention diagnoses the life of a bearing by not only the generation rate of the signal output by the comparison circuit, but also the generation rate and the integral value of this generation rate. This was done based on the fact that lifespan diagnosis can be made more safely if it is based on the total number of occurrences.
すなわち、この発明は、軸受が発生ずるＡＥを検出する
ＡＥセンサと、このＡＥセンサからのＡＥ倍信号基準値
と比較し、ＡＥ倍信号上記基準値を越えたときに信号を
出力する比較手段とを備え、上記比較手段からの信号に
基づいて上記軸受が寿命であるか否かを判別するように
した軸受の寿命診断装置において、上記比較手段からの
信号の発生レートを算出して、この算出した発生レート
のしきいレートに対するレート比を算出するレート比算
出手段と、上記比較手段からの信号の総発生数を算出し
て、この算出した総発生数のしきい総発生数に対する総
発生数比を算出する総発生数比算出手段と、上記レート
比算出手段で算出したレート比と上記総発生数比算出手
段で算出した総発生数比とに基づいて判断値を作成する
判断値作成手段と、上記判断値と基準値とを比較して、
上記判断値が基準値を越えたときに軸受は寿命に至った
ことを表す信号を出力する判別手段とを備えたことを特
徴としている。That is, the present invention includes an AE sensor that detects AE generated by a bearing, and comparison means that compares the AE multiplied signal from the AE sensor with a reference value and outputs a signal when the AE multiplied signal exceeds the reference value. In the bearing life diagnosis device, which is configured to determine whether or not the bearing has reached the end of its life based on the signal from the comparison means, the generation rate of the signal from the comparison means is calculated. rate ratio calculation means for calculating the rate ratio of the occurrence rate to the threshold rate; and a rate ratio calculation means for calculating the total number of occurrences of signals from the comparison means, and calculating the total number of occurrences of the calculated total number of occurrences relative to the threshold total number of occurrences. Total occurrence number ratio calculation means for calculating a ratio; Judgment value creation means for creating a judgment value based on the rate ratio calculated by the rate ratio calculation means and the total occurrence number ratio calculated by the total occurrence number ratio calculation means. Compare the above judgment value with the reference value,
The bearing is characterized in that it includes a determining means that outputs a signal indicating that the bearing has reached the end of its life when the judgment value exceeds a reference value.
く作用〉
上記レート比算出手段は、上記比較手段からＡＥ倍信号
上記基準値を越えたときに出力される信号の単位時間当
たりの発生数、すなわち発生レートを算出する（第３図
参照）。そしてさらに、この算出した発生レートのしき
いレートに対するレート比を算出する。一方、上記総発
生数比算出手段は、上記比較手段からの上記信号の総発
生数を算出する（第４図参照）。そしてさらに、この算
出した総発生数のしきい総発生数に対する総発生数比を
算出する。この総発生数比算出手段で算出した総発生数
比と上記レート比算出手段で算出した上記レート比とに
基づいて、上記判断値作成手段は、軸受の寿命を判断す
るための判断値を作成する。Function> The rate ratio calculation means calculates the number of occurrences per unit time of the signal output when the AE multiplied signal exceeds the reference value from the comparison means, that is, the generation rate (see FIG. 3). Furthermore, the rate ratio of the calculated occurrence rate to the threshold rate is calculated. On the other hand, the total number of occurrences ratio calculation means calculates the total number of occurrences of the signals from the comparison means (see FIG. 4). Further, the ratio of the calculated total number of occurrences to the threshold total number of occurrences is calculated. Based on the total occurrence number ratio calculated by the total occurrence number ratio calculation means and the rate ratio calculated by the rate ratio calculation means, the judgment value creation means creates a judgment value for determining the life of the bearing. do.
上記判別手段は、この判断値作成手段が作成した判断値
と基準値とを比較し、判断値が基準値を越えたときに軸
受は寿命に至ったことを示す信号を出力する。The determination means compares the determination value created by the determination value creation means with a reference value, and outputs a signal indicating that the bearing has reached the end of its life when the determination value exceeds the reference value.
このように、上記レート比と総発生数比とに基づいて判
別値を作成して、この判別値が基準値を越えたときに軸
受は寿命に至ったと判別するから、レート比と総発生数
の両者に基づいて寿命を判断でき、したかって、従来に
くらべてはるかに安全側に軸受が寿命に至ったか否かを
診断することができる。そして、軸受が比較手段からの
信号の発生レートがしきい発生レートを越えるような異
常なＡＥを発生したり、総発生数がしきい発生数をこえ
るような多くのＡＥを発生たときはただちに軸受は異常
であると診断できるのはもちろんのこと、従来では診断
できなかったようなしきいレート以下の発生レートで徐
々に寿命に至るような場合でも確実に寿命に至ったと判
別することができる。In this way, a discriminant value is created based on the rate ratio and the total number of occurrences, and when this discriminant value exceeds the reference value, it is determined that the bearing has reached the end of its service life. The life of the bearing can be determined based on both of these factors, and therefore, it is possible to diagnose whether the bearing has reached the end of its life much more safely than in the past. If the bearing generates an abnormal AE such that the signal generation rate from the comparison means exceeds the threshold generation rate, or a large number of AEs such that the total number of AE occurrences exceeds the threshold generation rate, immediately Not only can a bearing be diagnosed as abnormal, but it can also be reliably determined that the bearing has reached the end of its life even if the bearing gradually reaches the end of its life at an occurrence rate below a threshold rate, which could not be diagnosed in the past.
〈実施例〉 以下、この発明を図示の実施例により詳細に説明する。<Example> Hereinafter, the present invention will be explained in detail with reference to illustrated embodiments.
第１図において、ｌはＡＥセンサ、２はプリアンプ、３
はバンドパスフィルター、４はメインアンプ、５は比較
回路、６はカウンタ、７はコンピュータ、８は表示回路
である。In Fig. 1, l is an AE sensor, 2 is a preamplifier, and 3
is a band pass filter, 4 is a main amplifier, 5 is a comparison circuit, 6 is a counter, 7 is a computer, and 8 is a display circuit.
上記ＡＥセンサｌは図示しない軸受あるいはこの軸受を
支持する図示しないケース等に装着され、上記軸受がそ
の使用とともに微視的クラックの発生あるいは微視的ク
ラックの進展等に起因してＡＥを発生すればこの発生し
たＡＥを確実に検出してＡＥ倍信号を出力する。ＡＥセ
ンサｌで検出されたＡＥ倍信号は、プリアンプ２で増幅
された後、バントハスフィルター３に入力されて、この
バンドパスフィルター３によりたとえばその夏５０〜４
００ＫＨｚの周波数成分のみが通過させられる。The AE sensor l is attached to a bearing (not shown) or a case (not shown) that supports the bearing, and is designed to prevent the bearing from generating AE due to the occurrence of microscopic cracks or the progress of microscopic cracks as the bearing is used. To surely detect AE generated by tobacco and output an AE multiplied signal. The AE multiplied signal detected by the AE sensor 1 is amplified by the preamplifier 2 and then input to the bandpass filter 3.
Only frequency components of 00KHz are allowed to pass.
バンドパスフィルター３を通過したＡＥ倍信号メインア
ンプ４により増幅された後、比較回路５に入力される。The AE multiplied signal that has passed through the bandpass filter 3 is amplified by the main amplifier 4 and then input to the comparator circuit 5.
比較回路５は、メインアンプ４からのＡＥ倍信号ｌを基
準値Ａと比較し、ＡＥ倍信号ｌが基準値Ａを越えたとき
に越えたことを示す信号すをカウンタ６へ送出する。カ
ウンタ６は、比較回路５からの信号すの発生数をカウン
トする。そして、カウント結果としてのトータルカウン
トＣＴを示すカウント信号Ｃをコンピュータ７に入力す
る。コンピュータ７は、第２図に示すような処理を行う
。すなわち、まず、上記カウンタ６からのカウント信号
ＣのトータルカウントＣＴ、Ｌきいレートとしてのレー
トカウントしきい値ＳＬおよびしきい総発生数としての
トータルカウントしきい値ＳＴの設定を行い（ステップ
Ｓ２）、次いで、上記トータルカウントＣＴをＴＣとし
て記憶する（ステップＳ２）。そして、単位時間経過後
再びカウンタ６からのトータルカウントＣＴを受けて（
ステップＳ３）、発生レートとしてのレートカウントＣ
Ｌを算出する（ステップＳ４）。レートカウントＣＬは
その時点でのトータルカウントＣＴから記憶していたＣ
Ｔ（ＴＣ）を減じて算出する（ＣＬ＝ＣＴ−ＴＣ）。次
いで、設定しである上記レートカウントしきい値ＳＬに
対するレートカウントＣＬの比すなわちレート比（ＣＬ
／ＳＬ）と、上記トータルカウントしきい値ＳＴに対す
るトータルカウントＣＴの比すなわちトータルカウント
比（ＣＴ／ＳＴ）を算出し、さらにこの算出したレート
比（ＣＬ／ＳＬ）およびトータルカウント比（ＣＴ／Ｓ
Ｔ）を二乗することによって重み付けをする（ステッ
プＳ５、ＲＤ＝（ＯＬ／ＳＬ）”、ＴＤ＝（ＣＴ／ＳＴ
）”）。そして、上記重み付けしたｒ（ＤとＴＤの和の
平方根を算出して判断値りを求める（ステップＳ６、Ｄ
＝（ＲＤ＋ＴＤ）’°５）。そして、判断値Ｄｈ４１以
上ならば軸受が寿命であることを示す寿命信号ｄを寿命
表示回路８に人力して（ステップＳ７）、この寿命表示
回路８に軸受は寿命であることを表示させる。一方、判
断値りが１未満であれば再びステップＳ２に戻り、再び
上述の処理、つまり軸受の寿命診断を行う。そして、判
断値りが１以上になったときに、軸受が寿命であること
を示す寿命信号ｄを寿命表示回路８に人力する。A comparison circuit 5 compares the AE multiplied signal l from the main amplifier 4 with a reference value A, and when the AE multiplied signal l exceeds the reference value A, sends a signal S indicating that the AE multiplied signal l exceeds the reference value A to the counter 6. The counter 6 counts the number of signals generated from the comparator circuit 5. Then, a count signal C indicating a total count CT as a count result is input to the computer 7. The computer 7 performs processing as shown in FIG. That is, first, the total count CT of the count signal C from the counter 6, the rate count threshold SL as the L threshold rate, and the total count threshold ST as the total number of threshold occurrences are set (step S2). Then, the total count CT is stored as TC (step S2). Then, after the unit time has passed, the total count CT from the counter 6 is received again (
Step S3), rate count C as the rate of occurrence
Calculate L (step S4). The rate count CL is the C stored from the total count CT at that point.
Calculated by subtracting T(TC) (CL=CT-TC). Next, the ratio of the rate count CL to the set rate count threshold SL, that is, the rate ratio (CL
/SL) and the ratio of the total count CT to the total count threshold ST, that is, the total count ratio (CT/ST), and further calculate the calculated rate ratio (CL/SL) and total count ratio (CT/S).
weighting by squaring T) (step S5, RD=(OL/SL)", TD=(CT/ST
)").Then, the square root of the sum of the weighted r(D and TD is calculated to obtain the judgment value (step S6, D
=(RD+TD)'°5). Then, if the determination value Dh41 or more, a life signal d indicating that the bearing has reached the end of its life is manually inputted to the life display circuit 8 (step S7), thereby causing the life display circuit 8 to display that the bearing has reached the end of its life. On the other hand, if the judgment value is less than 1, the process returns to step S2 and the above-mentioned process, that is, the bearing life diagnosis is performed again. Then, when the judgment value becomes 1 or more, a life signal d indicating that the bearing has reached the end of its life is manually input to the life display circuit 8.
このコンピュータ７とカウンタ６によりレート比算出手
段および総発生数比算出手段は構成される。The computer 7 and the counter 6 constitute a rate ratio calculation means and a total occurrence ratio calculation means.
そして、コンピュータ７により判断値作成手段および判
別手段は構成される。The computer 7 constitutes the judgment value creation means and the discrimination means.
このように、カウンタ６から送られるカウント結果とし
てのカウント信号Ｃ（トータルカウントＣＴ）と予め設
定のレートカウントしきい値ＳＬおよびトータルカウン
トしきい値ＳＴに基づいて、レート比（ＣＬ／Ｓ Ｌ）
およびトータルカウント比（ＣＴ／ＳＴ）を算出し、こ
の算出したレート比（ＣＬ／ＳＬ）およびトータルカウ
ント比（ＣＴ／ＳＴ）に基づいて、
Ｄ−（（ＣＬ／ＳＬ）”＋（ＣＴ／ＳＴ）’）’・５・
・・■より判断値りを求め、この判断値りが１（基準値
）以上である場合に、つまり、
Ｄ＝（（ＣＬ／ＳＬ）”＋（ＣＴ／ＳＴ）”）’・５≧
１が成立する場合に、軸受は寿命であると判断する。In this way, the rate ratio (CL/S L) is calculated based on the count signal C (total count CT) as the count result sent from the counter 6 and the preset rate count threshold SL and total count threshold ST.
and the total count ratio (CT/ST), and based on the calculated rate ratio (CL/SL) and total count ratio (CT/ST), D-((CL/SL)"+(CT/ST) )')'・5・
... Find the judgment value from ■, and if this judgment value is greater than 1 (reference value), that is, D=((CL/SL)"+(CT/ST)")'・5≧
If 1 holds true, it is determined that the bearing has reached the end of its life.
したがって、カウント信号Ｃが示すトータルカウントＣ
Ｔの単位時間当たりの増加数、すなわちレートカウント
ＣＬが、レートカウントしきい値ＳＬより小さくなるよ
うなＡＥを発生しながら寿命に至り、従来では寿命であ
ると診断することができなかったようなケースでも、判
断値りを算出する上記式■がレートカウントＣＬだけで
なくトータルカウントＣＴもパラメータとして含むため
、トータルカウントＣＴが増加して、判断値りがｌ以」
二になった時点で、軸受は寿命であると診断することが
できる（第５図参照、図中Ｏ印にて寿命であると判別さ
れる）。もちろん、上記レートカウントしきい値ＳＬお
よびトータルカウントしきい値ＳＴは誤診のないよう適
宜な値が選ばれ設定される。Therefore, the total count C indicated by the count signal C
The number of increases in T per unit time, that is, the rate count CL, reaches the end of its life while generating AEs such that it becomes smaller than the rate count threshold SL, and conventionally it could not be diagnosed that the life is reached. In this case, the above formula (■) for calculating the judgment value includes not only the rate count CL but also the total count CT as a parameter, so the total count CT increases and the judgment value becomes less than l.
When the bearing reaches 2, it can be determined that the bearing has reached the end of its service life (see FIG. 5; it is determined that the service life has come to an end at the O mark in the figure). Of course, appropriate values are selected and set for the rate count threshold SL and total count threshold ST to avoid misdiagnosis.
このように、この軸受の寿命診断装置によれば、軸受の
寿命を従来に比べてより安全側に診断することができる
。In this way, according to this bearing life diagnosing device, it is possible to diagnose the bearing life more safely than in the past.
上記実施例ではレート比（ＣＬ／ＳＬ）およびトータル
カウント比（ＣＴ／ＳＴ）に基づいて、Ｄ＝（（ＣＬ／
ＳＬ）’＋（ＣＴ／ＳＴ）”）’−’より判断値りを作
成するようにしたが、判断値りは上記式によって作成す
るものに限らず、正確な軸受の寿命診断ができるよう、
レート比（ＣＬ／ＳＬ）およびトータルカウント比（Ｃ
Ｔ／ＳＴ）に適宜な重み付けをした式により作成するの
はいうまでもない。そしてもちろん、判断値りの判断基
準値はｌに限らない。また、レート比算出手段および総
発生数比算出手段はカウンタ６とコンピュータ７により
構成するものに限らず、また、判断値作成手段および判
別手段はコンピュータ７により構成するものに限らない
のはいうまでもない。In the above embodiment, D=((CL/ST) is based on the rate ratio (CL/SL) and the total count ratio (CT/ST).
Although the judgment value is created from SL)'+(CT/ST)'')'-', the judgment value is not limited to the one created using the above formula.
Rate ratio (CL/SL) and total count ratio (C
Needless to say, it is created using an equation in which appropriate weighting is applied to (T/ST). Of course, the criterion value for the determination value is not limited to l. Furthermore, it goes without saying that the rate ratio calculation means and the total number of occurrence ratio calculation means are not limited to those constructed by the counter 6 and the computer 7, and the judgment value creation means and discrimination means are not limited to those constructed by the computer 7. Nor.
〈発明の効果〉
このように、この発明の軸受の寿命診断装置は、従来の
判別手段からの信号の発生レートをしきいレートと比較
するだけで軸受の寿命診断を行うのと異なり、判別手段
からの信号の発生レートおよび総発生数をレート比算出
手段および総発生数比算出手段とにより夫々算出し、さ
らに、上記レート比算出手段により上記発生レートとし
きいレートとのレート比を算出する一方、上記総発生数
比算出手段により上記総発生数としきい総発生数との総
発生数比を算出し、この得られたレート比と総発生数比
とに基づいて判別値を作成して、この判別値が基準値を
越えたときに軸受は寿命に至ったと判別する。したがっ
て、この発明の軸受の寿命診断装置によれば、従来にく
らべてはるかに安全側に軸受が寿命に至ったか否かを診
断することができる。そして、軸受が比較手段からの信
号の発生レートがしきい発生レートを越えるような異常
なＡＥを発生したり、総発生数がしきい発生数をこえる
ような多くのＡＥを発生たときはただちに軸受は異常で
あると診断できるのはもちろんのこと、従来では診断で
きなかったようなしきいレート以下の発生レートで徐々
に寿命に至るような場合でも確実に寿命に至ったと判別
することができる。<Effects of the Invention> As described above, the bearing life diagnosis device of the present invention is different from the conventional method of diagnosing the life of a bearing by simply comparing the generation rate of the signal from the discrimination means with the threshold rate. The rate ratio calculation means and the total number of occurrences ratio calculation means respectively calculate the generation rate and the total number of occurrences of the signal from the signal, and further, the rate ratio calculation means calculates the rate ratio between the generation rate and the threshold rate. , calculating the total number of occurrences ratio between the total number of occurrences and the threshold total number of occurrences by the total number of occurrences ratio calculating means, and creating a discriminant value based on the obtained rate ratio and the total number of occurrences, When this determination value exceeds a reference value, it is determined that the bearing has reached the end of its life. Therefore, according to the bearing life diagnosing device of the present invention, it is possible to diagnose whether a bearing has reached the end of its life much more safely than in the past. If the bearing generates an abnormal AE such that the signal generation rate from the comparison means exceeds the threshold generation rate, or a large number of AEs such that the total number of AE occurrences exceeds the threshold generation rate, immediately Not only can a bearing be diagnosed as abnormal, but it can also be reliably determined that the bearing has reached the end of its life even if the bearing gradually reaches the end of its life at an occurrence rate below a threshold rate, which could not be diagnosed in the past.
第１図はこの発明の軸受の寿命診断装置の一実施例を示
すブロック図、第２図は第１図のコンピュータが行う処
理を説明するフローチャート、第３図は従来の軸受の寿
命診断装置では寿命を診断することができない場合の説
明図、第４図はＡＥの総発生数に基づく軸受の寿命診断
の説明図、第５図は本発明の軸受の寿命診断装置で安全
に寿命を診断することができる説明図である。
ｌ・・ＡＥセンサ、５・・・比較回路、６・・・カウン
タ、７・・・コンピュータ、ａ、ａ、・ＡＥ倍信、
ｂ・・・比較回路からの信号、ｄ・・・寿命信号、ＣＬ
・・・レートカウント（発生レート）、ＣＴ・・・トー
タルカウント（総発生数）、ＣＬ／ＳＬ・・・レート比
、Ｄ・・・判断値、ＳＬ・・・レートカウントしきい値
（しきいレート）、ＳＴ・・・トータルカウントしきい
値
（しきい総発生数）、
ＣＴ／ＳＴ・・・トータルカウント比（総発生数比）。
特 許 出 願 人 光洋精工株式会社代 理 人
弁理士 前動 葆 はか１名第２図
第３図
第４図
ＬＩＦＥ （％）Fig. 1 is a block diagram showing an embodiment of the bearing life diagnosis device of the present invention, Fig. 2 is a flow chart explaining the processing performed by the computer in Fig. 1, and Fig. 3 is a block diagram showing an embodiment of the bearing life diagnosis device of the present invention. An explanatory diagram of a case where the lifespan cannot be diagnosed. Fig. 4 is an explanatory diagram of a bearing lifespan diagnosis based on the total number of AE occurrences. Fig. 5 is a diagram illustrating the lifespan diagnosis of a bearing safely using the bearing lifespan diagnosis device of the present invention. It is an explanatory diagram that can be used. l...AE sensor, 5...comparison circuit, 6...counter, 7...computer, a, a, AE doubler, b...signal from comparison circuit, d...life signal , C.L.
...Rate count (occurrence rate), CT...Total count (total number of occurrences), CL/SL...Rate ratio, D...Judgment value, SL...Rate count threshold (threshold) ST: Total count threshold (threshold total number of occurrences), CT/ST: Total count ratio (total number of occurrences ratio). Patent applicant: Koyo Seiko Co., Ltd. Agent
Patent attorney: 1 person Figure 2 Figure 3 Figure 4 LIFE (%)
Claims (1)
のＡＥセンサからのＡＥ信号を基準値と比較し、ＡＥ信
号が上記基準値を越えたときに信号を出力する比較手段
とを備え、上記比較手段からの信号に基づいて上記軸受
が寿命であるか否かを判別するようにした軸受の寿命診
断装置において、 上記比較手段からの信号の発生レートを算出して、この
算出した発生レートのしきいレートに対するレート比を
算出するレート比算出手段と、上記比較手段からの信号
の総発生数を算出して、この算出した総発生数のしきい
総発生数に対する総発生数比を算出する総発生数比算出
手段と、上記レート比算出手段で算出したレート比と上
記総発生数比算出手段で算出した総発生数比とに基づい
て判断値を作成する判断値作成手段と、上記判断値と基
準値とを比較して、上記判断値が基準値を越えたときに
軸受は寿命に至ったことを表す信号を出力する判別手段
とを備えたことを特徴とする軸受の寿命診断装置。(1) Comprising an AE sensor that detects AE generated by the bearing, and comparison means that compares the AE signal from the AE sensor with a reference value and outputs a signal when the AE signal exceeds the reference value, In a bearing life diagnosis device that determines whether or not the bearing has reached the end of its life based on the signal from the comparison means, the generation rate of the signal from the comparison means is calculated, and the calculated generation rate is rate ratio calculating means for calculating the rate ratio to the threshold rate; and calculating the total number of occurrences of signals from the comparison means, and calculating the ratio of the total number of occurrences of the calculated total number of occurrences to the total number of threshold occurrences. a total number of occurrence ratio calculation means for calculating a total number of occurrences; a judgment value creation means for creating a judgment value based on the rate ratio calculated by the rate ratio calculation means and a total number of occurrences ratio calculated by the total number of occurrences ratio calculation means; A lifespan diagnosis of a bearing, characterized in that the judgment value is compared with a reference value, and when the judgment value exceeds the reference value, a determination means outputs a signal indicating that the bearing has reached the end of its life. Device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1204142A JP2885839B2 (en) | 1989-08-04 | 1989-08-04 | Bearing life diagnosis device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1204142A JP2885839B2 (en) | 1989-08-04 | 1989-08-04 | Bearing life diagnosis device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0367146A true JPH0367146A (en) | 1991-03-22 |
| JP2885839B2 JP2885839B2 (en) | 1999-04-26 |
Family
ID=16485532
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1204142A Expired - Fee Related JP2885839B2 (en) | 1989-08-04 | 1989-08-04 | Bearing life diagnosis device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2885839B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013511051A (en) * | 2009-11-17 | 2013-03-28 | スネクマ | System and method for measuring fatigue of aircraft mechanical parts, and aircraft maintenance method |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20100041696A (en) | 2007-07-12 | 2010-04-22 | 도꾸리쯔교세이호진상교기쥬쯔소고겡뀨죠 | High-pressure tank damage detecting method and device therefor |
| JP6965789B2 (en) * | 2018-02-27 | 2021-11-10 | トヨタ自動車株式会社 | High-pressure tank inspection method |
-
1989
- 1989-08-04 JP JP1204142A patent/JP2885839B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013511051A (en) * | 2009-11-17 | 2013-03-28 | スネクマ | System and method for measuring fatigue of aircraft mechanical parts, and aircraft maintenance method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2885839B2 (en) | 1999-04-26 |
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