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 PDFInfo
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Abstract
【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
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。
(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。
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。
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。
(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。
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。
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。
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。
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、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。
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。
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。
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。
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)。
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。
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)。
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)。
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。
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。
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。
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。
Claims (6)
- 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。 - 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。 - 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。 - 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。 - 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。
- 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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