JP2007304057A - 故障診断方法及び故障診断装置 - Google Patents

故障診断方法及び故障診断装置 Download PDF

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JP2007304057A
JP2007304057A JP2006135347A JP2006135347A JP2007304057A JP 2007304057 A JP2007304057 A JP 2007304057A JP 2006135347 A JP2006135347 A JP 2006135347A JP 2006135347 A JP2006135347 A JP 2006135347A JP 2007304057 A JP2007304057 A JP 2007304057A
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JP4584186B2 (ja
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Keisuke Ueno
佳祐 上野
Hidetoshi Yamaguchi
英俊 山口
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Toyota Motor Corp
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Abstract

【課題】生産設備の故障診断を良好に果たすことができる故障診断方法及び故障診断装置を提供する。
【解決手段】振動センサからの振動データd1から、周波数範囲0〜1000Hz、 … 19000〜20000Hzの周波数範囲に区分けされた20範囲分の周波数範囲対応振動データd2が抽出される。20範囲分の周波数範囲対応振動データd2のうち、高振幅部の間の中間部分の振動変化量が最小のものを周波数範囲対応変化最小振動データd3として算出する。周波数領域振動信号変換手段34は、周波数範囲対応変化最小振動データd3を、高速フーリエ変換してパワースペクトルd4を得る。判定手段35は、パワースペクトルd4から得られる判定用面積g1が、予め定められる判定用基準面積g0より小さい場合、中間ソケットに亀裂が発生していると診断する。
【選択図】図2

Description

本発明は、各種の生産設備に用いられる故障診断方法及び故障診断装置に関する。
従来、自動車工場などに配置される生産設備に用いられる故障診断方法の一例として、特許文献1に示される故障診断方法がある。特許文献1に示される故障診断方法は、回転機械のベアリングや歯車など金属と潤滑剤で成る機械要素に欠陥があったり、またはベルトが滑ったりすることにより、高振動数の振動を発生する機械設備における摩耗系の故障を診断するようにしている。そして、例えばベアリング(機械設備)が発する振動波形を検出し、この振動波形の絶対値の累積度数分布曲線における累積度数68.3%の値(等価実効値σeq)と、前記振動波形の最大値(xp)との比(β1)を求め、その比(β1)の大きさからベアリング(機械設備)の故障の程度を診断するようにしている。
特開2001−304954号公報
しかしながら、上述した従来技術では、生産設備の生産対象となるベアリング等の運動部品が発生する振動の振幅より前記生産設備を構成する運動部品が発生する振幅の方が大きい場合や、運動部品の数が多くて夫々の運動部品が振動する場合には、運動部品が発生する振動を特定できない。
また、上述した従来技術では、ベアリング以外に運動部品を持つ生産設備を対象にした場合、診断が困難である。
また、生産設備では、下記(1)〜(4)のような状況にあるのが一般的であり、上記従来技術を生産設備に適用して故障診断を行おうとしても、故障診断できる範囲は極めて限定されており、改善が求められているというのが実情である。
(1)生産設備を構成する運動部品が全て固有の振動数を有し、個々にその共振振動を発生する。
(2)複数の運動部品を含む生産設備の振動の発生源を特定することは極めて困難である。
(3)個々の運動部品が発する振動は運動状態によって異なる。
(4)同じ運動部品でも負荷が変わると振動波形が変わる。
本発明は、上記事情に鑑みてなされたものであり、生産設備の故障診断を良好に果たすことができる故障診断方法及び故障診断装置を提供することを目的とする。
請求項1記載の故障診断方法に係る発明は、生産設備に接触した振動センサに検出される時間領域の振動データについて、その成分を、所定の大きさに区分けされた複数の周波数範囲毎に抽出して、複数の周波数範囲対応振動データを得る範囲対応振動データ算出工程と、前記複数の周波数範囲対応振動データのうち、周期的に発生する高振幅部間の部分において振動変化が最も少ないものを周波数範囲対応変化最小振動データとして算出する範囲対応変化最小振動データ算出工程と、前記周波数範囲対応変化最小振動データを高速フーリエ変換して周波数領域の振動信号を得る周波数領域信号変換工程と、前記周波数領域の振動信号の総和と予め定められる周波数領域の振動信号の総和とを比較し、比較結果に基づいて、前記生産設備の状態を判定する判定工程と、を備えている。
請求項2記載の故障診断装置に係る発明は、生産設備に接触した振動センサに検出される時間領域の振動データについて、その成分を、所定の大きさに区分けされた複数の周波数範囲毎に抽出して、複数の周波数範囲対応振動データを得る範囲対応振動データ算出手段と、前記複数の周波数範囲対応振動データのうち、周期的に発生する高振幅部間の部分において振動変化が最も少ないものを周波数範囲対応変化最小振動データとして算出する範囲対応変化最小振動データ算出手段と、前記周波数範囲対応変化最小振動データを高速フーリエ変換により周波数領域の振動信号を得る周波数領域信号変換手段と、前記周波数領域の振動信号の総和と予め定められる周波数領域の振動信号の総和とを比較し、比較結果に基づいて、前記生産設備の状態を判定する判定手段と、を備えている。
請求項3記載の故障診断装置に係る発明は、生産設備に接触した振動センサに検出される時間領域の振動データについて、その成分を、所定の大きさに区分けされた複数の周波数範囲毎に抽出して、複数の周波数範囲対応振動データを得る範囲対応振動データ算出手段と、前記複数の周波数範囲対応振動データのそれぞれを高速フーリエ変換して複数範囲の周波数領域の振動信号を得る周波数領域振動信号変換手段と、を備え、予め前記生産設備として正常品を用いて前記範囲対応振動データ算出手段及び前記周波数領域振動信号変換手段を作動することにより複数範囲の周波数領域の振動信号に対応して得られる複数範囲の周波数領域の正常品振動信号と、前記複数範囲の周波数領域の振動信号の夫々の総和と前記複数範囲の周波数領域の正常品振動信号の総和との周波数範囲毎の比率を用いて、前記生産設備の状態を判定する判定手段と、を備えている。
請求項4記載の発明は、請求項3に記載の故障診断装置において、前記範囲対応振動データ算出手段に対して、抽出対象となる周波数範囲を指定する入力部を有し、前記複数範囲の周波数領域の正常品振動信号の夫々の総和に対する前記複数範囲の周波数領域の振動信号の夫々の総和の比率を周波数範囲毎に求め、最大比率となる周波数範囲を示す最大比率周波数範囲を、前記入力部に指定させる周波数範囲指定手段を備えている。
請求項5記載の発明は、請求項3に記載の故障診断装置において、判定結果及び各種信号波形を表示する表示部を有する。
請求項6記載の発明は、請求項5に記載の故障診断装置において、前記複数範囲の周波数領域の正常品振動信号の夫々の総和に対する前記複数範囲の周波数領域の振動信号の夫々の総和の比率を周波数範囲毎に求め、最大比率となる周波数範囲を算出する最大比率周波数範囲算出手段と、前記生産設備として複数個を対象にして前記最大比率周波数範囲算出手段を作動することにより算出される最大比率となる周波数範囲について、周波数範囲毎に合計して得られる周波数範囲毎算出度数を求め、前記最大比率となる周波数範囲及びこれに対応する周波数範囲毎算出度数をメモリに格納させる度数算出手段と、を備え、前記最大比率周波数範囲算出手段が得た複数個の最大比率の周波数範囲のうち最大値を示す周波数範囲及びこれに対応する前記周波数範囲毎算出度数を前記表示部に表示させる。
請求項1及び2記載の発明によれば、振動センサが検出する振動データから複数の周波数範囲対応振動データが抽出され、そのうち、周期的に発生する高振幅部間の部分において振動変化が最も少ない周波数範囲対応変化最小振動データが選択され、この周波数範囲対応変化最小振動データが高速フーリエ変換により周波数領域の振動信号に変換され、前記周波数領域の振動信号の総和と予め定められる周波数領域の振動信号の総和とが比較され、比較結果に基づいて、生産設備の状態が判定される。計測対象の表面に振動センサを接触させて内部の状況を把握でき、生産設備が不良とされた場合、生産設備の実稼働前に対処できる。
請求項3ないし6記載の発明によれば、生産設備に接触した振動センサに検出される時間領域の振動データについて、その成分を、所定の大きさに区分けされた複数の周波数範囲毎に抽出して、複数の周波数範囲対応振動データを得る範囲対応振動データ算出手段と、前記複数の周波数範囲対応振動データのそれぞれを高速フーリエ変換して複数範囲の周波数領域の振動信号を得る周波数領域振動信号変換手段と、を備え、予め前記生産設備として正常品を用いて前記範囲対応振動データ算出手段及び前記周波数領域振動信号変換手段を作動することにより複数範囲の周波数領域の正常品振動信号を求めておく一方、複数範囲の周波数領域の振動信号の夫々の総和と前記周波数領域の正常品振動信号の総和との周波数範囲毎の比率を用いて、前記生産設備の状態を判定する。
以下、本発明の第1実施の形態に係る故障診断方法及び故障診断装置を図面に基づいて説明する。
図1(A)、(B)は故障診断装置1を示す図、図2(A)、(B)は故障診断装置1が用いられるハブナット締付機2(生産設備。被診断設備)を示す図である。図3ないし図12は、本願発明者が、ハブナット締付機2の中間ソケット3に亀裂がない場合(図3〜図5、図9、図10)と、ある場合(図6〜図8、図11、図12)を対象にして実計測に基づいて得た信号波形図である。
故障診断装置1及び故障診断方法の説明に先だって、便宜上、故障診断装置1が用いられるハブナット締付機2について、説明する。
図2(A)、(B)に示すハブナット締付機2は、タイヤを車両に取付ける際、複数のハブナットを同時に回転・締付けるために用いられる。
ハブナット締付機2は、略円筒状の締付機本体5を有している。締付機本体5には、軸方向に延びる4角形孔6が形成された中間ソケット3がベアリング7を介して回動自在に取付けられている。締付機本体5の一端側には、駆動手段8が取付けられている。
駆動手段8には、中間ソケット3を介して4本のソケット部材9が連結されている。駆動手段8は、回転可能の出力軸11を有している。出力軸11は、先端側が断面四角形を成している。出力軸11の先端側部分と中間ソケット3とは、第1連結ピン12を介して一体的に連結され出力軸11の回転により中間ソケット3が回転する。
ソケット部材9は、基端側に形成された断面4角形の棒状部14と、棒状部14に連接されたソケット部材本体15とを備えている。ソケット部材9の棒状部14は、中間ソケット3の4角形孔6に進退自在に挿入されている。ソケット部材9の棒状部14には、第2連結ピン16が取付けられている。第2連結ピン16は、中間ソケット3に開けられた案内溝17に進退自在に臨まされている。ソケット部材9は、第2連結ピン16を備えていることにより、ソケット部材9が中間ソケット3から抜け出ることは無い。
ソケット部材9の先端側のソケット部材本体15と中間ソケット3の間にスプリング18が介在されソケット部材9を押出すよう付勢している。
ハブナット締付機2では、中間ソケット3が1回転するとソケット部材9が第2連結ピン16を支点としてシーソー運動し、中間ソケット3に2回衝突する。なお、図2(A)では、便宜上、ソケット部材9が紙面上下方向にシーソー運動するように示している(1点鎖線参照)が、実際は紙面表裏方向にシーソー運動する。
故障診断装置1は、図1(A)、(B)に示すように、下記(1)〜(8)の構成要素を備えている。
(1)締付機本体5の表面部(測定対象個所)に固定又は接触させて配置され、締付機本体5からの振動を検出する振動センサ20。
(2)振動センサ20に検出される時間領域の振動データd1(アナログ信号)を増幅する増幅器21。
(3)増幅器21からの振動データd1をデジタル信号に変換するA/D変換器22。
(4)バンドパスフィルタ23(後述する)を通過させる信号の周波数範囲の設定や検査開始などの条件の指示を入力する入力部24。
(5)入力部24、A/D変換器22、バンドパスフィルタ23、メモリ25(後述する)、及び表示器26(後述する)に接続されたCPU27(中央演算装置)。
(6)入力部24で指定された周波数範囲の振動データd1を通過させるバンドパスフィルタ23。
(7)本装置の実行のために用いる故障診断プログラム、バンドパスフィルタ23を通過した信号及び後述するようにして予め設定された判定用基準面積g0(判定基準信号となるパワースペクトルで定められる面積)を格納し、かつCPU27の作業エリアとして利用可能とされたメモリ25。
(8)CPU27から出力されるOK/NG判定、コメント、バンドパスフィルタ23を通過後の高速フーリエ変換で得られる信号(パワースペクトルd、判定用基準面積g0に対応するパワースペクトル)の波形、及び同波形面積等の所要データを表示する表示器26。
入力部24は、周波数範囲設定用スイッチ30及び検査開始スイッチ31を備えている。周波数範囲設定用スイッチ30の操作により、スキャン周波数範囲〔…Hz〜…Hz〕及び/又は周波数間隔〔…Hz〕などの設定情報をCPU27に入力する。検査開始スイッチ31の操作により故障診断プログラムが実行されて本故障診断装置1が稼働される。
CPU27は、図1(B)に示すように、範囲対応振動データ算出手段32と、範囲対応変化最小振動データ算出手段33と、周波数領域振動信号変換手段34と、判定手段35と、を備えている。
範囲対応振動データ算出手段32は、締付機本体5に接触された振動センサ20が検出した振動データd1(A/D変換器22が出力するデジタル信号)から、該振動データd1に含まれる成分を、所定の大きさに区分けされた複数の周波数範囲毎に抽出して、複数の周波数範囲対応振動データd2を得る。
範囲対応変化最小振動データ算出手段33は、前記複数の周波数範囲対応振動データd2のうち、周期的に発生する高振幅部間の部分において振動変化が最も少ないものを周波数範囲対応変化最小振動データd3として算出する。
周波数領域振動信号変換手段34は、周波数範囲対応変化最小振動データd3を高速フーリエ変換により周波数〔Hz〕及び強さ〔mV2〕で示される周波数領域の振動信号(以下、パワースペクトルd4という。)に変換する。
判定手段35は、パワースペクトルd4の波形と横軸とで囲まれる面積(以下、判定用面積g1という。パワースペクトルd4の総和)と、予め定められる基準となるパワースペクトル(判定基準信号)の波形と横軸とで囲まれる面積(以下、判定用基準面積g0という。判定基準信号の総和)とを比較して、比較結果に基づいて、前記ハブナット締付機2(生産設備)の状態を判定する。
CPU27は、入力部24の操作による設定情報の入力を受け、この入力内容に応じて、バンドパスフィルタ23が通過させる周波数範囲を調整して、範囲対応振動データ算出手段32の上記作動を可能としている。
例えば、CPU27は、周波数間隔〔(C)Hz〕を1000Hzとする内容の設定情報の入力を受けると、バンドパスフィルタ23について、0〜1000Hz、1000〜2000Hz、2000〜3000Hz、3000〜4000、4000〜5000、 … 、19000〜20000Hzの各周波数範囲(20個の周波数範囲)の成分を通すように切換え調整する。この切換調整は、各周波数範囲に対する処理が終了する毎に順次行われる。
そして、0〜1000Hzの周波数成分を通すようにバンドパスフィルタ23が調整された状態で、範囲対応振動データ算出手段32が振動データd1(A/D変換器22通過後のデジタル信号)をバンドパスフィルタ23に入力すると、バンドパスフィルタ23を通して、周波数範囲が0〜1000Hzの周波数範囲対応振動データd2が得られる。
CPU27は、この0〜1000Hzの周波数範囲対応振動データd2をメモリ25に入力する。
CPU27は、0〜1000Hzの周波数範囲対応振動データd2のメモリ25への入力の後、バンドパスフィルタ23について、1000〜2000Hzの周波数範囲の成分を通すように切換え調整する。この状態で、範囲対応振動データ算出手段32が振動データd1(デジタル信号)をバンドパスフィルタ23に入力すると、バンドパスフィルタ23を通して、周波数範囲が1000〜2000Hzの周波数範囲対応振動データd2が得られる。
CPU27は、この1000〜2000Hzの周波数範囲対応振動データd2をメモリ25に入力する。
以下、同様の処理が行われ、周波数範囲が2000〜3000Hz、 3000〜4000、 … 、19000〜20000Hzの周波数範囲対応振動データd2が得られ、メモリ25に入力される。本実施の形態では、20個の周波数範囲対応振動データd2が求められ、メモリ25に格納される。
範囲対応変化最小振動データ算出手段33は、メモリ25に格納されている0〜1000Hz、 … 、19000〜20000Hzの20個の周波数範囲対応振動データd2を対象にして、図4、図7、図9、図11に示されるように、周期的に発生する高振幅部40間の部分(以下、中間部分41という。)における振動変化の量(振動変化量)を比較する。そして、この比較結果により、振動変化量が最も少ないものを周波数範囲対応変化最小振動データd3として算出する。
範囲対応変化最小振動データ算出手段33は、例えば、図4に示す1000〜2000Hzの周波数範囲対応振動データd2と、図9に示す4000〜5000Hzの周波数範囲対応振動データd2とを比較した場合、図4に示す1000〜2000Hzの周波数範囲対応振動データd2の方が振動変化量が少ないことから、1000〜2000Hzの周波数範囲対応振動データd2を周波数範囲対応変化最小振動データd3として算出する。また、例えば、図7に示す1000〜2000Hzの周波数範囲対応振動データd2と、図11に示す4000〜5000Hzの周波数範囲対応振動データd2との比較では、振動変化量が少ないことから図7に示す1000〜2000Hzの周波数範囲対応振動データd2を周波数範囲対応変化最小振動データd3として算出する。
周波数領域振動信号変換手段34は、前記周波数範囲対応変化最小振動データd3を、図5、図8、図10及び図12に示すように、高速フーリエ変換手法を用いてスペクトル分析し、横軸(横軸)に周波数(Hz)をとり、縦軸に強さ(mV2)をとったグラフで示されるパワースペクトルd4に変換する。
判定手段35は判定用面積g1(パワースペクトルd4の総和)と、判定用基準面積g0(判定基準信号の総和)とを比較して、比較結果に基づいて、ハブナット締付機2の状態を判定する。
図8は、中間ソケット3に亀裂が存在しない場合における周波数範囲対応変化最小振動データd3に基づいて得られるパワースペクトルd4に相当するが、このパワースペクトルd4を仮に判定基準信号とし、判定用基準面積g0を定めた場合を考える。この場合に、上記処理により図5に示すパワースペクトルd4が得られると、図5における判定用面積g1は、前記判定用基準面積g0(図8参照)より小さいことにより、中間ソケット3に亀裂が発生していると診断する。
範囲対応変化最小振動データ算出手段33の比較処理及びこの比較処理による周波数範囲対応変化最小振動データd3の算出、並びに判定手段35の判定処理は、本願発明者が、見出した以下の内容(第1、第2、第3内容)に基づいている。
本願発明者は、中間ソケット3に亀裂がない場合(図3〜図5、図9、図10)と、ある場合(図6〜図8、図11、図12)を対象にして実計測を行い、範囲対応変化最小振動データ算出手段33が算出する複数の周波数範囲対応振動データd2における周期的に発生する高振幅部40に着目し、以下の内容(第1、第2内容)を見出した。
すなわち、高振幅部40の発生周期は、ソケット部材9が中間ソケット3を打撃する周期と一致すること、ひいては高振幅部40は、ソケット部材9が中間ソケット3の打撃に際して生じる特徴的な振動であると考えられること(第1内容)を見出した。
そして、高振幅部40間の部分(中間部分41)の振動変化量が大きいことは、ソケット部材9が中間ソケット3を打撃する振動以外の振動が多く混在することを示しており、中間部分41の振動変化量が小さい場合、中間ソケット3の亀裂状況がより把握し易くなること(第2内容)を見出した。
また、複数の周波数範囲対応振動データd2のうち、高振幅部40間の中間部分41において振動変化が最も少ないものに相当する周波数範囲対応変化最小振動データd3についてスペクトル分析することにより周波数及び強さで示されるパワースペクトルd4が得られ、このパワースペクトルd4の総和は、中間ソケット3の亀裂の有無で異なり、亀裂がある場合には、無い場合に比して、小さくなる特性があること(第3内容)を見出した。
上述したように構成された故障診断装置1の作用を、以下に説明する。
故障診断装置1の振動センサ20を、回転している中間ソケット3に至近な締付機本体5の表面に当てて、入力部24に備えた検査開始スイッチ31を操作する。
そして、ハブナット締付機2が発する振動が振動センサ20に検出され(範囲対応振動データ算出工程)、その振動データd1がCPU27に入力される(図3、図6)。
CPU27の範囲対応振動データ算出手段32は、入力を受けた振動データd1を、周波数範囲が1000〜2000Hzの振動だけ通すよう設定されたバンドパスフィルタ23に通して、0〜1000Hzの周波数範囲対応振動データd2を得て(範囲対応振動データ算出工程)、これをメモリ25に入力する。
以下、同様にして、1000〜2000Hz 、 … 19000〜20000Hzの周波数範囲対応振動データd2を順次、得て、これをメモリ25に入力する。
範囲対応変化最小振動データ算出手段33は、メモリ25に格納されている0〜1000Hz、 … 、19000〜20000Hzの周波数範囲対応振動データd2を対象にして、高振幅部40間の中間部分41における振動変化量を比較する。そして、この比較結果により、振動変化量が最も少ないものを周波数範囲対応変化最小振動データd3として算出する(範囲対応変化最小振動データ算出工程)。本実施の形態では、図4に示す1000〜2000Hzの周波数範囲対応振動データd2を周波数範囲対応変化最小振動データd3として算出した場合を例にする。
続いて、周波数領域振動信号変換手段34は、前記周波数範囲対応変化最小振動データd3(図4に示す1000〜2000Hzの周波数範囲対応振動データd2)を、高速フーリエ変換して図5に示すパワースペクトルd4を得る(周波数領域信号変換工程)。
次に、判定手段35は、図5に示すパワースペクトルd4の波形と横軸とで囲まれる判定用面積g1と、図8に示すパワースペクトルd4(判定基準信号)の波形と横軸とで囲まれる判定用基準面積g0とを比較して、図5の判定用面積g1が図8の判定用基準面積g0より小さいことに基づいて、中間ソケット3に亀裂が発生していると診断する(判定工程)。
そして、本実施の形態では、内蔵されて外部から見えない部品でも表面から振動センサ20を当てるだけでハブナット締付機2の状況を把握して中間ソケット3の亀裂の有無を判定できる。これによりハブナット締付機2(生産設備、被診断設備)を使用前に点検して異常があれば使用前に異常部品の交換ができるので使用途中で故障するような事態になることを適切に回避して、設備の稼働率を向上させることができる。
上記実施の形態では、判定用基準面積g0及び判定用面積g1の比較結果に基づいて、中間ソケット3への亀裂の発生の有無を検出しているが、判定用基準面積g0及び判定用面積g1を夫々2乗して得られるデータを用い感度を上げるようにしてもよい。
上記実施の形態では、CPU27が、範囲対応変化最小振動データ算出手段33及び周波数領域振動信号変換手段34を備え、範囲対応変化最小振動データ算出手段33及び周波数領域振動信号変換手段34の作動により得られるパワースペクトルd4(周波数領域の振動信号)の総和を用いて亀裂の発生状況を検出する場合を例にしたが、本発明は、これに限られない。
例えば、上述したように機能する図1(B)のCPU27に代えて、図13に示すCPU27Aを設け、かつ、後述するように予め求められてメモリ25に格納された複数範囲の正常品パワースペクトルd4s(周波数領域の正常品振動信号)を用いるようにしても良い(第2実施の形態)。
図13に示すCPU27Aは、範囲対応振動データ算出手段32を備え、図1(B)の範囲対応変化最小振動データ算出手段33を廃止し、図1(B)の周波数領域振動信号変換手段34の判定手段35に夫々代わる周波数領域振動信号変換手段34A、判定手段35A(図1(B)に示すものと区別するために便宜上、第2周波数領域振動信号変換手段34A、第2判定手段35Aという。)を設けている。
第2周波数領域振動信号変換手段34Aは、複数の周波数範囲対応振動データd2のそれぞれを高速フーリエ変換して複数範囲のパワースペクトルd4(周波数領域の振動信号)を得る。
第2実施の形態では、予めハブナット締付機2として正常品を用いて前記範囲対応振動データ算出手段32及び第2周波数領域振動信号変換手段34Aを作動することにより前記複数範囲(本実施の形態では20範囲分)の周波数領域の振動信号に対応して得られる複数範囲(本実施の形態では20範囲分)の正常品パワースペクトルd4s(複数範囲の周波数領域の正常品振動信号)を求め、これをメモリ25に格納している。
第2判定手段35Aは、複数範囲のパワースペクトルd4の夫々の総和と複数範囲の正常品パワースペクトルd4sとを周波数範囲毎に比較し、この比較結果に基づいて、前記生産設備の状態を判定する。
この第2実施の形態では、パワースペクトルd4の波形と横軸とで囲まれる判定用面積g1(パワースペクトルd4の総和)及び正常品パワースペクトルd4sの波形と横軸とで囲まれる判定用基準面積g0(正常品パワースペクトルd4sの総和)を算出する。そして、両者の面積差を周波数範囲毎に求め(本実施の形態では20個の面積差のデータ)、周波数範囲毎の面積差が周波数範囲毎に予め定められた許容値を超える場合に、中間ソケット3に亀裂が発生している虞がある等のようにハブナット締付機2の状態を判定する。
上記第2実施の形態では、判定用面積g1及び判定用基準面積g0の面積差を用いてハブナット締付機2の状態を判定する場合を例にしている。これに代えて、複数範囲の判定用基準面積g0(複数範囲の周波数領域の正常品振動信号の夫々の総和)に対する複数範囲の判定用面積g1(複数範囲の周波数領域の振動信号の夫々の総和)の比率〔以下、便宜上、面積比率という。〕を周波数範囲毎に求め、この面積比率を用いて、ハブナット締付機2の状態を判定するようにしてもよい。
上述したように周波数範囲毎に面積比率を求める場合において、さらに、複数(上記例では20個)の面積比率のうち、最大面積比率となる周波数範囲を示す最大面積比率周波数範囲を、入力部24(図1参照)に指定させる(請求項4の周波数範囲指定手段)ようにしてもよい。このように構成することにより、入力部24の指定を自動的に行うことが可能になり、これに伴い亀裂の発生検出を容易に行うことができる。
この場合、周波数範囲毎に求められた面積比率、判定結果、最大面積比率周波数範囲、及び各種信号波形を表示器26に表示することにより、検査内容を把握し易くなる。なお、上記各実施の形態においても、この例と同様に、判定結果、判定に至る各種算出データ、各種信号波形等を表示器26に表示し、これにより、検査内容の把握の容易化を図ることができる。
また、上述した面積比率の算出を利用し、図1(B)のCPU27に代わる図14のCPU27Bを設け、後述する周波数範囲毎算出度数を表示器26(図1参照)に表示させるように故障診断装置1を構成してもよい(第3実施の形態)。
図14に示すCPU27Bは、最大面積比率周波数範囲算出手段45、度数算出手段46を備えている。
最大面積比率周波数範囲算出手段45は、複数範囲の判定用基準面積g0の夫々(複数範囲の周波数領域の正常品振動信号の夫々の総和)に対する複数範囲の判定用面積g1(前記複数範囲の周波数領域の振動信号の夫々の総和)の面積比率を周波数範囲毎に求め、その面積比率のうち最大である最大面積比率となる周波数範囲を算出する。
度数算出手段46は、生産設備として複数個のハブナット締付機2を対象にして最大面積比率周波数範囲算出手段45を作動して算出される最大面積比率となる周波数範囲について、周波数範囲毎に積算するようにして周波数範囲毎算出度数を求める。この算出により、最大面積比率となる周波数範囲と、これに対応する周波数範囲毎算出度数とが、メモリ25に格納される。
そして、図14に示すCPU27Bを備えて構成される故障診断装置1では、最大面積比率周波数範囲算出手段45が得た複数個の最大面積比率のうち最大値を示す周波数範囲及びこれに対応する前記周波数範囲毎算出度数について、前記周波数範囲毎算出度数の大きい順に複数個(例えば5個)表示器26に表示させる。このように構成される故障診断装置1では、ハブナット締付機2にバラツキがあっても、バラツキに応じた周波数範囲の設定が可能になる。
第3実施の形態において、CPU27Bに次のように構成される周波数範囲指定手段を設けるようにしてもよい。
この周波数範囲指定手段は、複数範囲の判定用基準面積g0の夫々(複数範囲の周波数領域の正常品振動信号の夫々の総和)に対する複数範囲の判定用面積g1(前記複数範囲の周波数領域の振動信号の夫々の総和)の面積比率を周波数範囲毎に求め、最大面積比率となる周波数範囲を示す最大面積比率周波数範囲を、前記入力部24に指定させる。
このように構成することにより、判定の自動化をより進めることできる。
本発明の第1実施の形態に係る故障診断装置を示し、(A)は故障診断装置を模式的に示すブロック図、(B)は(A)のCPUが有する構成要素を示すブロック図である。 図1の故障診断装置が用いられるハブナット締付機を示し、(A)は(B)のA−A線に沿う断面図、(B)はハブナット締付機の締付機本体に振動センサを配置した状態を模式的に示す図である。 図1の故障診断装置を用い、図2の中間ソケットに亀裂が存在する場合に得られた振動データを示す波形図である。 図3のデータから1000〜2000Hzの振動成分を抽出した波形図である。 図4の振動データを高速フーリエ変換して得たパワースペクトルを示す波形図である。 図1の故障診断装置を用い、図2の中間ソケットに亀裂が存在しない場合に得られた振動データを示す波形図である。 図6のデータから1000〜2000Hzの振動成分を抽出した波形図である。 図7の振動データを高速フーリエ変換して得たパワースペクトルを示す波形図である。 図3のデータから4000〜5000Hzの振動成分を抽出した波形図である。 図9の振動データを高速フーリエ変換して得たパワースペクトルを示す波形図である。 図6のデータから4000〜5000Hzの振動成分を抽出した波形図である。 図11の振動データを高速フーリエ変換して得たパワースペクトルを示す波形図である。 本発明の第2実施の形態に用いるCPUが有する構成要素を示すブロック図である。 本発明の第3実施の形態に用いるCPUが有する構成要素を示すブロック図である。
符号の説明
1…故障診断装置、2…ハブナット締付機(生産設備)、3…中間ソケット、20…振動センサ、32…範囲対応振動データ算出手段、33…範囲対応変化最小振動データ算出手段、34…周波数領域振動信号変換手段、35…判定手段。

Claims (6)

  1. 生産設備に接触した振動センサに検出される時間領域の振動データについて、その成分を、所定の大きさに区分けされた複数の周波数範囲毎に抽出して、複数の周波数範囲対応振動データを得る範囲対応振動データ算出工程と、
    前記複数の周波数範囲対応振動データのうち、周期的に発生する高振幅部間の部分において振動変化が最も少ないものを周波数範囲対応変化最小振動データとして算出する範囲対応変化最小振動データ算出工程と、
    前記周波数範囲対応変化最小振動データを高速フーリエ変換して周波数領域の振動信号を得る周波数領域信号変換工程と、
    前記周波数領域の振動信号の総和と予め定められる周波数領域の振動信号の総和とを比較し、比較結果に基づいて、前記生産設備の状態を判定する判定工程と、
    を備えた故障診断方法。
  2. 生産設備に接触した振動センサに検出される時間領域の振動データについて、その成分を、所定の大きさに区分けされた複数の周波数範囲毎に抽出して、複数の周波数範囲対応振動データを得る範囲対応振動データ算出手段と、
    前記複数の周波数範囲対応振動データのうち、周期的に発生する高振幅部間の部分において振動変化が最も少ないものを周波数範囲対応変化最小振動データとして算出する範囲対応変化最小振動データ算出手段と、
    前記周波数範囲対応変化最小振動データを高速フーリエ変換により周波数領域の振動信号を得る周波数領域信号変換手段と、
    前記周波数領域の振動信号の総和と予め定められる周波数領域の振動信号の総和とを比較し、比較結果に基づいて、前記生産設備の状態を判定する判定手段と、
    を備えた故障診断装置。
  3. 生産設備に接触した振動センサに検出される時間領域の振動データについて、その成分を、所定の大きさに区分けされた複数の周波数範囲毎に抽出して、複数の周波数範囲対応振動データを得る範囲対応振動データ算出手段と、
    前記複数の周波数範囲対応振動データのそれぞれを高速フーリエ変換して複数範囲の周波数領域の振動信号を得る周波数領域振動信号変換手段と、
    を備え、
    予め前記生産設備として正常品を用いて前記範囲対応振動データ算出手段及び前記周波数領域振動信号変換手段を作動することにより複数範囲の周波数領域の振動信号に対応して得られる複数範囲の周波数領域の正常品振動信号と、
    前記複数範囲の周波数領域の振動信号の夫々の総和と前記複数範囲の周波数領域の正常品振動信号の総和との周波数範囲毎の比率を用いて、前記生産設備の状態を判定する判定手段と、
    を備えた故障診断装置。
  4. 請求項3に記載の故障診断装置において、前記範囲対応振動データ算出手段に対して、抽出対象となる周波数範囲を指定する入力部を有し、
    前記複数範囲の周波数領域の正常品振動信号の夫々の総和に対する前記複数範囲の周波数領域の振動信号の夫々の総和の比率を周波数範囲毎に求め、最大比率となる周波数範囲を示す最大比率周波数範囲を、前記入力部に指定させる周波数範囲指定手段を備えた故障診断装置。
  5. 請求項3に記載の故障診断装置において、判定結果及び各種信号波形を表示する表示部を有する故障診断装置。
  6. 請求項5に記載の故障診断装置において、
    前記複数範囲の周波数領域の正常品振動信号の夫々の総和に対する前記複数範囲の周波数領域の振動信号の夫々の総和の比率を周波数範囲毎に求め、最大比率となる周波数範囲を算出する最大比率周波数範囲算出手段と、
    前記生産設備として複数個を対象にして前記最大比率周波数範囲算出手段を作動することにより算出される最大比率となる周波数範囲について、周波数範囲毎に合計して得られる周波数範囲毎算出度数を求め、前記最大比率となる周波数範囲及びこれに対応する周波数範囲毎算出度数をメモリに格納させる度数算出手段と、
    を備え、
    前記最大比率周波数範囲算出手段が得た複数個の最大比率の周波数範囲のうち最大値を示す周波数範囲及びこれに対応する前記周波数範囲毎算出度数を前記表示部に表示させる故障診断装置。

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