JP4706316B2 - Tire testing apparatus and tire testing method - Google Patents
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Description
この発明は、タイヤ試験装置およびタイヤ試験方法に関し、さらに詳しくは、タイヤ試験における測定値の異常を排除することにより高精度な試験結果が得られるタイヤ試験装置およびタイヤ試験方法に関する。 The present invention relates to a tire testing apparatus and a tire testing method, and more particularly to a tire testing apparatus and a tire testing method that can obtain a highly accurate test result by eliminating an abnormality in measured values in a tire test.
転がり抵抗やユニフォミティ等に関するタイヤ試験では、試験結果として得られる測定値にバラツキや誤差などの異常が存在する。したがって、高精度な試験結果を得るためには、かかる測定値の異常の影響を排除すべき必要がある。 In a tire test related to rolling resistance, uniformity, and the like, there are abnormalities such as variations and errors in measured values obtained as test results. Therefore, in order to obtain a highly accurate test result, it is necessary to eliminate the influence of such abnormal measurement values.
かかる課題において、従来のタイヤ試験装置には、特許文献１に記載される技術が知られている。従来のタイヤ試験装置（タイヤ用試験機の精度維持方法）では、複数本のマスタータイヤを継続的に測定し、これらの測定データの経時変化から試験機の精度調整を実施することを特徴とする。 In this problem, a technique described in Patent Document 1 is known for a conventional tire testing apparatus. A conventional tire testing apparatus (a method for maintaining the accuracy of a tire testing machine) continuously measures a plurality of master tires, and adjusts the accuracy of the testing machine from changes over time in these measurement data. .
この発明は、タイヤ試験における測定値の異常を排除することにより高精度な試験結果が得られるタイヤ試験装置およびタイヤ試験方法を提供することを目的とする。 An object of the present invention is to provide a tire testing apparatus and a tire testing method that can obtain a highly accurate test result by eliminating an abnormality in a measured value in a tire test.
上記目的を達成するため、この発明にかかるタイヤ試験装置は、試験タイヤを対象とするタイヤ試験を行うタイヤ試験装置であって、タイヤ試験により取得された測定値群から異常値を判別する異常値判別手段を含み、且つ、前記タイヤ試験が回転速度を試験水準とすると共に振幅あるいは位相を測定値とするユニフォーミティ試験であるときに、異常値判別手段は、複数の前記試験水準下にて取得された前記測定値群に基づいて前記試験水準と測定値との相関を示す予備的な初期回帰式を算出し、前記測定値群と前記初期回帰式から算出される回帰値との差に基づいて標準偏差を算出すると共に、前記標準偏差が所定の許容範囲外にある測定値を異常値と判断することを特徴とする。 In order to achieve the above object, a tire test apparatus according to the present invention is a tire test apparatus that performs a tire test on a test tire, and determines an abnormal value from a measured value group acquired by the tire test. includes discrimination means, and, when the tire testing is uniformity test to measure the amplitude or phase as well as the rotational speed and the test levels, abnormal value determining means, obtains under the plurality of test levels based on the difference between the regression value the test levels and to calculate a preliminary initial regression equation that shows a correlation between the measured value is calculated from the initial regression equation and the measured value group based on the measurement value group is And calculating a standard deviation, and determining a measured value having the standard deviation out of a predetermined allowable range as an abnormal value.
このタイヤ試験装置では、複数の試験水準下にて取得された測定値群に基づいて初期回帰式が算出されて標準偏差が算出され、この標準偏差と所定の許容範囲との比較により、測定値の以上が判断される。これにより、一定の基準に基づいて異常値が測定値群から的確に排除されるので、試験結果の高精度化が実現されてタイヤ試験の信頼性が向上する利点がある。 In this tire test apparatus, an initial regression equation is calculated based on a group of measurement values acquired under a plurality of test levels, a standard deviation is calculated, and a measurement value is obtained by comparing the standard deviation with a predetermined allowable range. The above is judged. Accordingly, since abnormal values are accurately excluded from the measurement value group based on a certain standard, there is an advantage that the test results are highly accurate and the reliability of the tire test is improved.
また、この発明にかかるタイヤ試験装置は、一の試験水準に対して複数の測定値が取得される場合には、前記異常値判別手段が、複数の前記試験水準毎に前記測定値の標準偏差を算出すると共に当該標準偏差が所定の許容範囲にある測定値に基づいて前記初期回帰式を算出する。 Further, in the tire testing apparatus according to the present invention, when a plurality of measurement values are acquired for one test level, the abnormal value determination unit is configured to provide a standard deviation of the measurement values for each of the plurality of test levels. And the initial regression equation is calculated based on the measured value in which the standard deviation is within a predetermined allowable range.
このタイヤ試験装置では、一の試験水準に対して複数の測定値が取得される場合に、複数の試験水準毎に測定値の標準偏差が算出されると共にこの標準偏差が所定の許容範囲にある測定値に基づいて初期回帰式が算出されるので、初期回帰式の算出段階にて測定値に含まれる異常値が予備的に排除される。これにより、より適切な最終採用値が採用されるので、より高精度な試験結果が取得される利点がある。 In this tire testing apparatus, when a plurality of measurement values are acquired for one test level, the standard deviation of the measurement value is calculated for each of the plurality of test levels and the standard deviation is within a predetermined allowable range. Since the initial regression equation is calculated based on the measurement value, the abnormal value included in the measurement value is preliminarily excluded at the initial regression equation calculation stage. Thereby, since a more appropriate final adopted value is adopted, there is an advantage that a more accurate test result can be obtained.
また、この発明にかかるタイヤ試験装置は、前記測定値と前記初期回帰式からの回帰値との差に基づいて算出される前記標準偏差の許容範囲に対して前記試験水準毎に重み付けが行われ、当該標準偏差に基づいて前記異常値の判別が行われる。 In the tire testing apparatus according to the present invention, the tolerance of the standard deviation calculated based on the difference between the measured value and the regression value from the initial regression equation is weighted for each test level. The abnormal value is discriminated based on the standard deviation.
このタイヤ試験装置では、標準偏差の許容範囲に対して各試験水準毎に重み付けが行われ、かかる標準偏差に基づいて異常値の判別が行われるので、測定値のバラつき等が考慮された高精度な試験結果が得られる利点がある。 In this tire testing device, the tolerance of the standard deviation is weighted for each test level, and abnormal values are discriminated based on the standard deviation. Advantageous test results can be obtained.
また、この発明にかかるタイヤ試験装置は、前記異常値が排除された測定値群に基づいて最終的な回帰式（以下、最終回帰式という。）が算出されると共に、この最終回帰式に基づいてタイヤ試験の試験結果にかかる評価が行われる。 In the tire testing apparatus according to the present invention, a final regression equation (hereinafter referred to as a final regression equation) is calculated based on the measurement value group from which the abnormal values are excluded, and based on the final regression equation. Thus, an evaluation of the test result of the tire test is performed.
このタイヤ試験装置では、異常値を含まない測定値群から算出された最終回帰式により試験結果の評価が行われるので、より適正かつ的確な試験結果の評価が得られる利点がある。 This tire testing apparatus has an advantage that a more appropriate and accurate evaluation of the test result can be obtained because the test result is evaluated by the final regression equation calculated from the measurement value group not including the abnormal value.
また、この発明にかかるタイヤ試験装置は、タイヤ試験機および試験タイヤの異常を診断する異常診断手段を有し、且つ、前記異常診断手段は、蓄積された既存の測定値群に基づいて前記初期回帰式および前記標準偏差の算出ならびに前記異常値の判断を行うと共に前記異常値が排除された既存の測定値群に基づいて最終的な回帰式（以下、最終回帰式という。）を算出し、異常診断の対象となる複数の試験タイヤについて新規に取得された測定値群と前記最終回帰式から算出される回帰値との差に基づいて標準偏差（以下、対象標準偏差という。）を算出し、（１）複数の前記試験タイヤにかかる前記対象標準偏差群のうちの所定数以上が所定の許容範囲外にある場合にはタイヤ試験装置が異常であると判断し、（２）前記対象標準偏差群のうちの所定数未満が所定の許容範囲外にある場合には試験タイヤが異常であると判断する。 Further, the tire test apparatus according to the present invention has a tire test machine and an abnormality diagnosis means for diagnosing abnormality of the test tire, and the abnormality diagnosis means is configured to perform the initial measurement based on the accumulated existing measurement value group. A final regression equation (hereinafter referred to as a final regression equation) is calculated based on an existing measurement value group in which a regression equation and the standard deviation are calculated and the abnormal value is determined and the abnormal value is excluded. A standard deviation (hereinafter referred to as a target standard deviation) is calculated based on a difference between a newly obtained measurement value group and a regression value calculated from the final regression equation for a plurality of test tires to be subjected to abnormality diagnosis. (1) When a predetermined number or more of the target standard deviation groups applied to the plurality of test tires are outside a predetermined allowable range, it is determined that the tire test apparatus is abnormal, and (2) the target standard Deviation group If less than the predetermined number of out is outside the predetermined tolerance test tire is determined to be abnormal.
このタイヤ試験装置では、蓄積された既存の測定値群（過去のデータ）について初期回帰式を用いた異常値判別処理が行われ、異常値が排除された既存の測定値群に基づいて最終回帰式が算出される。そして、異常診断の対象となる複数の試験タイヤについて新規に取得された測定値群と最終回帰式から算出される回帰値との差に基づいて標準偏差が算出され、この標準偏差と所定の許容範囲との比較により、タイヤ試験装置および試験タイヤの異常診断が行われる。かかる構成では、異常値が排除された高精度な既存の測定値群（最終回帰式）と、診断対象であるタイヤ試験の試験結果（新規な測定値群）とが一定の手法により比較されて、タイヤ試験装置および対象タイヤの異常診断が行われる。これにより、適正かつ的確な異常診断結果が得られる利点がある。 In this tire testing apparatus, an abnormal value determination process using an initial regression equation is performed on the accumulated measurement value group (past data), and the final regression is performed based on the existing measurement value group from which the abnormal value is excluded. An expression is calculated. Then, the standard deviation is calculated based on the difference between the newly obtained measurement value group and the regression value calculated from the final regression equation for the plurality of test tires to be subjected to the abnormality diagnosis. By comparing with the range, abnormality diagnosis of the tire test apparatus and the test tire is performed. In such a configuration, a highly accurate existing measurement value group (final regression equation) from which abnormal values have been eliminated is compared with a test result (new measurement value group) of a tire test that is a diagnosis target by a certain method. An abnormality diagnosis of the tire testing device and the target tire is performed. Thereby, there is an advantage that an appropriate and accurate abnormality diagnosis result can be obtained.
また、この発明にかかるタイヤ試験方法は、試験タイヤを対象とするタイヤ試験を行うタイヤ試験方法であって、タイヤ試験により取得された測定値群から異常値を判別する異常値判別ステップを含み、且つ、前記タイヤ試験が回転速度を試験水準とすると共に振幅あるいは位相を測定値とするユニフォーミティ試験であるときに、前記異常値判別ステップでは、複数の試験水準下にて取得された前記測定値群に基づいて前記試験水準と測定値との相関を示す予備的な初期回帰式が算出され、前記測定値群と前記初期回帰式から算出される回帰値との差に基づいて標準偏差が算出されると共に、前記標準偏差が所定の許容範囲外にある測定値が異常値と判断されることを特徴とする。 Further, the tire test method according to the present invention is a tire test method for performing a tire test on a test tire, and includes an abnormal value determination step of determining an abnormal value from a measurement value group acquired by the tire test, and, wherein when the tire testing is uniformity test for the amplitude or phase and the measured values as well as the rotational speed and the test levels, in the abnormal value determining step, the measurements obtained under a plurality of test levels A preliminary initial regression equation indicating the correlation between the test level and the measured value is calculated based on the group, and a standard deviation is calculated based on the difference between the measured value group and the regression value calculated from the initial regression equation In addition, a measured value having the standard deviation outside a predetermined allowable range is determined as an abnormal value.
このタイヤ試験方法では、複数の試験水準下にて取得された測定値群に基づいて初期回帰式が算出されて標準偏差が算出され、この標準偏差と所定の許容範囲との比較により、測定値の以上が判断される。これにより、一定の基準に基づいて異常値が測定値群から的確に排除されるので、試験結果の高精度化が実現されてタイヤ試験の信頼性が向上する利点がある。 In this tire test method, an initial regression equation is calculated based on a group of measurement values acquired under a plurality of test levels, a standard deviation is calculated, and a measurement value is obtained by comparing the standard deviation with a predetermined allowable range. The above is judged. Accordingly, since abnormal values are accurately excluded from the measurement value group based on a certain standard, there is an advantage that the test results are highly accurate and the reliability of the tire test is improved.
この発明にかかるタイヤ試験装置では、複数の試験水準下にて取得された測定値群に基づいて初期回帰式が算出されて標準偏差が算出され、この標準偏差と所定の許容範囲との比較により、測定値の以上が判断されるので、一定の基準に基づいて異常値が測定値群から的確に排除され、試験結果の高精度化が実現されてタイヤ試験の信頼性が向上する利点がある。 In the tire testing apparatus according to the present invention, an initial regression equation is calculated based on measurement value groups obtained under a plurality of test levels, a standard deviation is calculated, and a comparison between the standard deviation and a predetermined allowable range is performed. Since the measurement value is judged above, the abnormal value is accurately excluded from the measurement value group based on a certain standard, and there is an advantage that the test result is highly accurate and the reliability of the tire test is improved. .
以下、この発明につき図面を参照しつつ詳細に説明する。なお、この実施例によりこの発明が限定されるものではない。また、この実施例の構成要素には、当業者が置換可能かつ容易なもの、或いは実質的同一のものが含まれる。また、この実施例に記載された複数の変形例は、当業者自明の範囲内にて任意に組み合わせが可能である。 Hereinafter, the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. The constituent elements of this embodiment include those that can be easily replaced by those skilled in the art or those that are substantially the same. In addition, a plurality of modifications described in this embodiment can be arbitrarily combined within a range obvious to those skilled in the art.
図１〜図４は、この発明の実施例にかかるタイヤ試験装置の作用を示すフローチャート（図１および図４）ならびに説明図（図２および図３）である。図５〜図８は、タイヤ試験装置の適用例１を示す説明図である。図９および図１０は、タイヤ試験装置の適用例２を示すフローチャート（図９）および説明図（図１０）である。 1 to 4 are a flowchart (FIGS. 1 and 4) and an explanatory diagram (FIGS. 2 and 3) showing an operation of the tire testing apparatus according to the embodiment of the present invention. 5-8 is explanatory drawing which shows the application example 1 of a tire test apparatus. 9 and 10 are a flowchart (FIG. 9) and an explanatory diagram (FIG. 10) showing an application example 2 of the tire testing apparatus.
このタイヤ試験装置（図示省略）は、公知の試験手段により、試験タイヤ（マスタータイヤあるいは製品タイヤ）を対象とする試験（以下、タイヤ試験をいう。）を行い得る。また、タイヤ試験装置は、タイヤ試験により試験結果として取得された複数の測定値（以下、測定値群という。）から不適正な測定値（以下、異常値という。）を判別する異常値判別手段（図示省略）を有する。この異常値判別手段は、例えば、タイヤ試験装置に接続されたＰＣ（personal computer）により構成される。なお、タイヤ試験には、例えば、タイヤの転がり抵抗やユニフォミティなどの測定試験が含まれる。 This tire testing apparatus (not shown) can perform a test (hereinafter referred to as a tire test) on a test tire (master tire or product tire) by a known test means. In addition, the tire test apparatus is an abnormal value discriminating unit that discriminates an inappropriate measurement value (hereinafter referred to as an abnormal value) from a plurality of measurement values (hereinafter referred to as a measurement value group) acquired as test results by the tire test. (Not shown). This abnormal value discrimination means is constituted by, for example, a PC (personal computer) connected to the tire testing apparatus. The tire test includes, for example, measurement tests such as tire rolling resistance and uniformity.
このタイヤ試験装置では、以下のように異常値の判別処理が行われる（図１〜図３参照）。まず、試験タイヤに対して複数の試験水準Ｌ１〜Ｌ３下にてタイヤ試験が行われ、試験結果として各試験水準Ｌ１〜Ｌ３に対応した測定値群が取得される（ＳＴ１１）。例えば、タイヤ試験がタイヤのユニフォミティ試験である場合には、タイヤの回転数（試験水準Ｌ１〜Ｌ３）に応じた測定値がそれぞれ取得される（図５〜図８参照）。 In this tire testing apparatus, an abnormal value determination process is performed as follows (see FIGS. 1 to 3). First, a tire test is performed on the test tire under a plurality of test levels L1 to L3, and measurement value groups corresponding to the test levels L1 to L3 are acquired as test results (ST11). For example, when the tire test is a tire uniformity test, measured values corresponding to the number of rotations of the tire (test levels L1 to L3) are respectively acquired (see FIGS. 5 to 8).
次に、取得された測定値群に基づいて予備的な回帰式ｙ1（以下、初期回帰式ｙ1という。）が算出される（ＳＴ１２）。この初期回帰式ｙ1は、例えば、線形近似、多項式近似、相対近似、指数近似などにより算出される。 Next, a preliminary regression equation y 1 (hereinafter referred to as initial regression equation y 1 ) is calculated based on the acquired measurement value group (ST12). This initial regression equation y 1 is calculated by, for example, linear approximation, polynomial approximation, relative approximation, exponential approximation, or the like.
次に、初期回帰式ｙ1から回帰値が算出され、この回帰値と測定値との差に基づいて平均値および標準偏差が算出される（ＳＴ１３）。そして、この標準偏差が所定の許容範囲にある測定値が、最終的な採用値（以下、最終採用値という。）として採用（選択）される（ＳＴ１４）。一方、最終採用値として採用されなかった測定値が異常値と判断されて試験結果から除外される。なお、この実施例１では、標準偏差の許容範囲が±１σに設定されて、最終採用値が選択される。ただし、かかる標準偏差の許容範囲は適用されるタイヤ試験に応じて適宜変更され得る。 Then, the calculated regression value from the initial regression equation y 1, mean and standard deviation is calculated based on the difference between the measured value and the regression value (ST13). Then, a measured value having this standard deviation within a predetermined allowable range is adopted (selected) as a final adopted value (hereinafter referred to as a final adopted value) (ST14). On the other hand, a measured value that is not adopted as the final adopted value is determined as an abnormal value and is excluded from the test result. In the first embodiment, the standard deviation allowable range is set to ± 1σ, and the final adopted value is selected. However, the allowable range of the standard deviation can be appropriately changed according to the applied tire test.
次に、複数の最終採用値から成る測定値群に基づいて最終的な回帰式ｙ2（以下、最終回帰式ｙ2という。）が算出され（ＳＴ１５）、この最終回帰式ｙ2が用いられて試験結果の後続処理が行われる。これにより、測定値の異常（バラツキや誤差）が排除されて、試験結果の高精度化が実現される。 Next, a final regression equation y 2 (hereinafter referred to as final regression equation y 2 ) is calculated based on a measurement value group composed of a plurality of final adopted values (ST15), and this final regression equation y 2 is used. Subsequent processing of test results is then performed. Thereby, abnormalities (variations and errors) in measured values are eliminated, and high accuracy of test results is realized.
［効果］
このタイヤ試験装置では、複数の試験水準Ｌ１〜Ｌ３下にて取得された測定値群に基づいて予備的な回帰式ｙ1（以下、初期回帰式という。）が算出され、測定値群と初期回帰式ｙ1から算出される回帰値との差に基づいて標準偏差が算出されると共に、この標準偏差が所定の許容範囲外にある測定値が異常値と判断される。かかる構成では、一定の基準に基づいて異常値が測定値群から的確に排除されるので、試験結果の高精度化が実現されてタイヤ試験の信頼性が向上する利点がある。
[effect]
In this tire testing apparatus, a preliminary regression equation y 1 (hereinafter referred to as an initial regression equation) is calculated based on measurement value groups acquired under a plurality of test levels L1 to L3. A standard deviation is calculated based on the difference from the regression value calculated from the regression equation y 1, and a measured value having the standard deviation outside a predetermined allowable range is determined as an abnormal value. In such a configuration, since abnormal values are accurately excluded from the measurement value group based on a certain standard, there is an advantage that the accuracy of the test result is improved and the reliability of the tire test is improved.
［付加事項１］
なお、このタイヤ試験装置では、例えば、同一の試験タイヤに対して複数回のタイヤ試験が行われ、あるいは、複数の試験タイヤに対してタイヤ試験がそれぞれ行われることにより、一の試験水準Ｌに対して複数の測定値が取得される場合がある（図２参照）。かかる場合には、以下のように初期回帰式ｙ1が算出されることが好ましい（図３参照）。
[Additional matter 1]
In this tire testing apparatus, for example, a plurality of tire tests are performed on the same test tire, or a tire test is performed on a plurality of test tires, thereby achieving one test level L. On the other hand, a plurality of measured values may be acquired (see FIG. 2). In such a case, it is preferable to calculate the initial regression equation y 1 as follows (see FIG. 3).
まず、取得された複数の測定値に基づいて、各試験水準Ｌ１〜Ｌ３毎に測定値の平均値および標準偏差が算出される（ＳＴ１２１）。そして、この標準偏差が所定の許容範囲にある測定値が初期的な採用値（以下、初期採用値という。）として採用される（ＳＴ１２２）。そして、各試験水準Ｌ１〜Ｌ３の初期採用値に基づいて、初期回帰式ｙ1が算出される（ＳＴ１２３）。なお、この実施例１では、標準偏差の許容範囲が±１σに設定されて、初期採用値が選択される。ただし、かかる標準偏差の許容範囲は適用されるタイヤ試験に応じて適宜変更され得る。 First, based on a plurality of acquired measurement values, an average value and a standard deviation of the measurement values are calculated for each test level L1 to L3 (ST121). Then, a measured value having this standard deviation within a predetermined allowable range is adopted as an initial adopted value (hereinafter referred to as initial adopted value) (ST122). Then, an initial regression equation y 1 is calculated based on the initial adopted values of the test levels L1 to L3 (ST123). In the first embodiment, the standard deviation allowable range is set to ± 1σ, and the initial adopted value is selected. However, the allowable range of the standard deviation can be appropriately changed according to the applied tire test.
かかる構成では、初期回帰式ｙ1の算出段階にて測定値に含まれる異常値が予備的に排除されるので、より適切な最終採用値が採用される。これにより、より高精度な試験結果が取得される利点がある。 In such a configuration, an abnormal value included in the measured value is preliminarily excluded at the calculation stage of the initial regression equation y 1 , and thus a more appropriate final adopted value is adopted. Thereby, there exists an advantage by which a more highly accurate test result is acquired.
［付加事項２］
また、このタイヤ試験装置では、測定値と初期回帰式ｙ1からの回帰値との差に基づいて算出される標準偏差の許容範囲に対して各試験水準Ｌ１〜Ｌ３毎に重み付けが行われ、かかる標準偏差に基づいて異常値の判別（最終採用値の選択）が行われることが好ましい（図４参照）。したがって、異常値の判別にあたり、標準偏差の許容範囲が各試験水準Ｌ１〜Ｌ３間にて相異しても良い。かかる重み付けは、測定値のバラつき等を考慮しつつタイヤ試験に応じて適宜行われる。これにより、より高精度な試験結果が得られる利点がある。
[Additional matter 2]
Further, in the tire testing apparatus, the weighting for each test level L1~L3 is made to the allowable range of the standard deviation calculated based on the difference between the regression values from the measured values and the initial regression equation y 1, It is preferable that an abnormal value is determined (selection of a final adopted value) based on the standard deviation (see FIG. 4). Therefore, in determining the abnormal value, the allowable range of the standard deviation may be different between the test levels L1 to L3. Such weighting is appropriately performed according to the tire test in consideration of variations in measured values. Thereby, there is an advantage that a test result with higher accuracy can be obtained.
［適用例１］
また、このタイヤ試験装置は、公知のタイヤ試験に対して当業者自明の範囲内にて任意に適用され得る。ここでは、一例として、高速ユニフォミティの測定試験を採り上げて説明する。
[Application Example 1]
Moreover, this tire test apparatus can be arbitrarily applied to a known tire test within a range obvious to those skilled in the art. Here, as an example, a high-speed uniformity measurement test is taken and described.
高速ユニフォミティは、製品タイヤの基本特性であり、例えば、車体とタイヤとのマッチングデータの検証にあたり利用される。高速ユニフォミティの測定試験では、高速ユニフォミティの一次成分に関して残留アンバランスの影響が存在するため、高速ユニフォミティとは別に残留アンバランスの測定が行われる。かかる残留アンバランスは、タイヤを無負荷状態としつつ目標速度以上から惰性で回転させて測定される。そして、高速ユニフォミティの測定値から残留アンバランスの測定値を差し引いたデータに基づいて、高速ユニフォミティの評価が行われる。 High-speed uniformity is a basic characteristic of product tires, and is used, for example, for verification of matching data between a vehicle body and a tire. In the high-speed uniformity measurement test, there is an influence of residual imbalance on the primary component of high-speed uniformity. Therefore, the residual unbalance is measured separately from the high-speed uniformity. Such residual unbalance is measured by rotating the tire with inertia from above the target speed while leaving the tire unloaded. Then, the high-speed uniformity is evaluated based on the data obtained by subtracting the measurement value of the residual unbalance from the high-speed uniformity measurement value.
ここで、このタイヤ試験装置では、上記の残留アンバランスの測定にあたり、測定値の異常が判別される（図１および図５〜図８参照）。測定値の異常判別ステップでは、まず、所定の試験条件下にて残留アンバランスが測定されて、各回転数（試験水準）に対応する測定値がそれぞれ取得される（ＳＴ１１）。かかる測定値群は、例えば、ＲＦＶの一次成分にかかる振幅および位相（図５および図６参照）、並びに、ＴＦＶの一次成分にかかる振幅および位相（図７および図８参照）の試験結果について取得される。 Here, in the tire test apparatus, in the measurement of the residual imbalance, an abnormality in the measured value is determined (see FIGS. 1 and 5 to 8). In the measurement value abnormality determination step, first, the residual imbalance is measured under predetermined test conditions, and the measurement values corresponding to the respective rotation speeds (test levels) are obtained (ST11). Such measurement value groups are obtained, for example, for the test results of the amplitude and phase (see FIGS. 5 and 6) applied to the primary component of RFV and the amplitude and phase (see FIGS. 7 and 8) applied to the primary component of TFV. Is done.
次に、取得された測定値群に基づいて初期回帰式ｙ1が算出される（ＳＴ１２）。この初期回帰式ｙ1は、各試験結果についてそれぞれ算出される。また、振幅に関する試験結果では、初期回帰式ｙ1が二次曲線により近似され、位相に関する試験結果では、初期回帰式ｙ1が直線により近似される。 Next, an initial regression equation y 1 is calculated based on the acquired measurement value group (ST12). This initial regression equation y 1 is calculated for each test result. In the test result related to the amplitude, the initial regression equation y 1 is approximated by a quadratic curve, and in the test result related to the phase, the initial regression equation y 1 is approximated by a straight line.
次に、初期回帰式ｙ1から回帰値が算出され、この回帰値と測定値との差に基づいて平均値および標準偏差が算出される（ＳＴ１３）。そして、この標準偏差が所定の許容範囲にある測定値が、最終採用値として選択される（ＳＴ１４）。一方、最終採用値として採用されなかった測定値は、異常値と判断されて試験結果から除外される。なお、この高速ユニフォミティの測定試験では、標準偏差の許容範囲が、振幅および位相のいずれの試験結果においても±１σである。ただし、標準偏差の許容範囲は、試験条件などに応じて適宜変更されることが好ましい。 Then, the calculated regression value from the initial regression equation y 1, mean and standard deviation is calculated based on the difference between the measured value and the regression value (ST13). Then, a measured value having this standard deviation within a predetermined allowable range is selected as a final adopted value (ST14). On the other hand, a measured value that has not been adopted as the final adopted value is judged as an abnormal value and is excluded from the test results. In this high-speed uniformity measurement test, the allowable range of standard deviation is ± 1σ in both the amplitude and phase test results. However, it is preferable that the allowable range of the standard deviation is appropriately changed according to test conditions and the like.
次に、複数の最終採用値から成る（異常値が排除された）測定値群に基づいて最終回帰式ｙ2が算出され（ＳＴ１５）、この最終回帰式ｙ2から残留アンバランスのベクトル成分が算出される。そして、高速ユニフォミティの測定値と残留アンバランスとのベクトル成分の差が算出されて、高速ユニフォミティの評価が行われる。 Next, a final regression equation y 2 is calculated based on a measured value group consisting of a plurality of final adopted values (excluding abnormal values) (ST15), and the residual imbalance vector component is calculated from the final regression equation y 2. Calculated. Then, the difference between the vector components of the measured value of the high speed uniformity and the residual unbalance is calculated, and the high speed uniformity is evaluated.
上記のように、この適用例１にかかるタイヤ試験装置では、異常値が排除された測定値群に基づいて最終回帰式ｙ2が算出されると共に、この最終回帰式ｙ2に基づいてタイヤ試験の試験結果にかかる評価（高速ユニフォミティの評価）が行われるので、一定の手法により選択された高精度な測定値群に基づいて、タイヤ試験の試験結果にかかる評価が行われる。これにより、適正かつ的確な試験結果の評価が得られる利点がある。 As described above, with the tire testing device according to Application Example 1, the final regression equation y 2 on the basis of abnormal values are excluded measured value group is calculated, the tire testing on the basis of the final regression equation y 2 Since the evaluation according to the test result (high-speed uniformity evaluation) is performed, the evaluation according to the test result of the tire test is performed based on the highly accurate measurement value group selected by a certain method. This has an advantage that an appropriate and accurate evaluation of the test result can be obtained.
［適用例２］
また、このタイヤ試験装置は、タイヤ試験装置自身の故障や試験タイヤの異常を診断する異常診断手段を有する（図示省略）。タイヤ試験装置および試験タイヤの異常判断は、以下のように行われる（図９および図１０参照）。
[Application Example 2]
Moreover, this tire test apparatus has an abnormality diagnosis means for diagnosing a failure of the tire test apparatus itself and an abnormality of the test tire (not shown). The abnormality determination of the tire testing device and the test tire is performed as follows (see FIGS. 9 and 10).
まず、過去のタイヤ試験により蓄積された測定値群（既存の測定値群）が取得される（ＳＴ２１）。この測定値群は、例えば、過去の試験結果が蓄積されたデータベース（図示省略）から読み込まれて取得される。この適用例２では、過去の第１回〜第７０回までのタイヤ試験における測定値群が試験回数（試験水準）に関連付けられてデータベースに蓄積されており、この測定群がタイヤ試験装置に読み込まれる。なお、この測定値群は、マスタータイヤを試験対象とした転がり抵抗の試験結果である。 First, a measurement value group (existing measurement value group) accumulated by past tire tests is acquired (ST21). This measured value group is read and acquired from a database (not shown) in which past test results are accumulated, for example. In this application example 2, the measurement value group in the past 1st to 70th tire tests is associated with the number of tests (test level) and accumulated in the database, and this measurement group is read into the tire testing apparatus. It is. In addition, this measured value group is the test result of rolling resistance which made the master tire the test object.
次に、取得された既存の測定値群に基づいて初期回帰式ｙ1が算出される（ＳＴ２２）。この初期回帰式ｙ1は、すべての試験回数における測定値の平均値Ａ1から成る直線である。そして、この初期回帰式ｙ1から回帰値が算出され、この回帰値と測定値との差に基づいて各測定値の標準偏差Ｄ1が算出される（ＳＴ２３）。 Next, an initial regression equation y 1 is calculated based on the acquired group of existing measurement values (ST22). This initial regression equation y 1 is a straight line composed of the average value A 1 of the measured values in all the test times. Then, the initial regression value from the regression equation y 1 is calculated, the standard deviation D 1 of the respective measurement values based on the difference between the measured value and the regression value is calculated (ST23).
次に、この標準偏差Ｄ1が所定の許容範囲にある測定値が最終採用値として選択される（ＳＴ２４）。一方、最終採用値として採用されなかった測定値が異常値と判断されて試験結果から除外される。これにより、最終採用値から成る（異常値が排除された）測定値群により試験結果が構成される。なお、この適用例２では、標準偏差Ｄ1の許容範囲が±１σに設定される。ただし、この標準偏差Ｄ1の許容範囲は、試験条件などに応じて適宜設定変更されることが好ましい。 Next, the measurement value standard deviation D 1 is in a predetermined allowable range is selected as the final adopted value (ST24). On the other hand, a measured value that is not adopted as the final adopted value is determined as an abnormal value and is excluded from the test result. Thereby, a test result is comprised by the measured value group which consists of the last employ | adopted value (an abnormal value was excluded). In this application example 2, the allowable range of the standard deviation D 1 is set to ± 1σ. However, it is preferable that the allowable range of the standard deviation D 1 is appropriately changed according to test conditions and the like.
次に、複数の最終採用値から成る測定値群に基づいて最終回帰式ｙ2が算出される（ＳＴ２５）。この最終回帰式ｙ2は、すべての最終採用値の平均値Ａ2から成る直線である。 Next, a final regression equation y 2 is calculated based on a measured value group consisting of a plurality of final adopted values (ST25). This final regression equation y 2 is a straight line composed of the average value A 2 of all final adopted values.
次に、異常診断の対象となる複数の試験タイヤについて新規にタイヤ試験が行われ、各試験タイヤについて新規な測定値Ｒ1〜Ｒ3がそれぞれ取得される（ＳＴ２６）。そして、この新規な測定値群Ｒ1〜Ｒ3と最終回帰式ｙ2から算出された回帰値との差に基づいて標準偏差（以下、対象標準偏差という。）Ｄ2が算出される（ＳＴ２７）。タイヤ試験装置および試験タイヤの異常診断ステップでは、かかる新規な測定値群Ｒ1〜Ｒ3の対象標準偏差Ｄ2が用いられる。 Next, a new tire test is performed for a plurality of test tires to be subjected to abnormality diagnosis, and new measurement values R 1 to R 3 are acquired for each test tire (ST26). Then, a standard deviation (hereinafter referred to as a target standard deviation) D 2 is calculated based on the difference between the new measurement value groups R 1 to R 3 and the regression value calculated from the final regression equation y 2 (ST27). ). In the tire test apparatus and the abnormality diagnosis step of the test tire, the target standard deviation D 2 of the new measurement value groups R 1 to R 3 is used.
異常診断ステップでは、新規な測定値群Ｒ1〜Ｒ3の対象標準偏差Ｄ2が所定の許容範囲内にあるか否かがそれぞれ判断され、その結果に基づいてタイヤ試験装置および試験タイヤの異常が判断される（ＳＴ２８）。なお、この適用例２では、対象標準偏差Ｄ2の許容範囲が±３σに設定される。ただし、対象標準偏差Ｄ2の許容範囲は、適宜設定変更されることが好ましい。 Abnormality diagnosis step, whether the target standard deviation D 2 of the new measured value group R 1 to R 3 is within a predetermined tolerance range are respectively determined, the abnormality of the tire testing apparatus and a test tire on the basis of the result Is determined (ST28). In this application example 2, the allowable range of the target standard deviation D 2 is set to ± 3σ. However, it is preferable that the allowable range of the target standard deviation D 2 is appropriately changed.
まず、新規な測定値Ｒ1〜Ｒ3のすべての対象標準偏差Ｄ2が所定の許容範囲内（±３σ以内）にある場合には、タイヤ試験装置および試験タイヤの双方が正常であると判断される（ＳＴ２９１）。次に、（１）これらの対象標準偏差Ｄ2のうちの所定数未満（例えば、一の対象標準偏差Ｄ2のみ）が許容範囲外にある（許容範囲内にない）場合には、タイヤ試験装置が正常であり、試験タイヤが異常（故障）であると判断される（ＳＴ２９２）。一方、（２）これらの対象標準偏差Ｄ2のうちの所定数以上（例えば、複数の対象標準偏差Ｄ2）が許容範囲外にある場合には、タイヤ試験装置が異常（故障）であり、試験タイヤが正常であると判断される（ＳＴ２９３）。 First, it determined that all eligible standard deviation D 2 new measurements R 1 to R 3 is when there within a predetermined allowable range (within ± 3 [sigma]) is both a tire testing apparatus and a test tire is normal (ST291). Next, (1) if less than a predetermined number of these target standard deviations D 2 (for example, only one target standard deviation D 2 ) is outside the allowable range (not within the allowable range), the tire test It is determined that the apparatus is normal and the test tire is abnormal (failure) (ST292). On the other hand, (2) when a predetermined number or more of these target standard deviations D 2 (for example, a plurality of target standard deviations D 2 ) are outside the allowable range, the tire testing apparatus is abnormal (failure), It is determined that the test tire is normal (ST293).
上記のように、この適用例２にかかるタイヤ試験装置では、蓄積された既存の測定値群（過去のデータ）について初期回帰式を用いた異常値判別処理が行われ、異常値が排除された既存の測定値群に基づいて最終回帰式が算出される。そして、異常診断の対象となる複数の試験タイヤについて新規に取得された測定値群と最終回帰式から算出される回帰値との差に基づいて標準偏差が算出され、この標準偏差と所定の許容範囲との比較により、タイヤ試験装置および試験タイヤの異常診断が行われる。 As described above, in the tire testing apparatus according to this application example 2, the abnormal value determination process using the initial regression equation is performed on the accumulated existing measurement value group (past data), and the abnormal value is excluded. A final regression equation is calculated based on the existing measured value group. Then, the standard deviation is calculated based on the difference between the newly obtained measurement value group and the regression value calculated from the final regression equation for the plurality of test tires to be subjected to the abnormality diagnosis. By comparing with the range, abnormality diagnosis of the tire test apparatus and the test tire is performed.
かかる構成では、異常値が排除された高精度な既存の測定値群（最終回帰式）と、診断対象であるタイヤ試験の試験結果（新規な測定値群）とが一定の手法により比較されて、タイヤ試験装置および対象タイヤの異常診断が行われる。これにより、適正かつ的確な異常診断結果が得られる利点がある。 In such a configuration, a highly accurate existing measurement value group (final regression equation) from which abnormal values have been eliminated is compared with a test result (new measurement value group) of a tire test that is a diagnosis target by a certain method. An abnormality diagnosis of the tire testing device and the target tire is performed. Thereby, there is an advantage that an appropriate and accurate abnormality diagnosis result can be obtained.
以上のように、本発明にかかるタイヤ試験装置およびタイヤ試験方法は、タイヤ試験における測定値の異常を排除することにより高精度な試験結果が得られる点で有用である。 As described above, the tire test apparatus and the tire test method according to the present invention are useful in that a highly accurate test result can be obtained by eliminating the abnormality of the measurement value in the tire test.
Claims (6)
タイヤ試験により取得された測定値群から異常値を判別する異常値判別手段を含み、且つ、
前記タイヤ試験が回転速度を試験水準とすると共に振幅あるいは位相を測定値とするユニフォーミティ試験であるときに、
異常値判別手段は、複数の前記試験水準下にて取得された前記測定値群に基づいて前記試験水準と測定値との相関を示す予備的な初期回帰式を算出し、前記測定値群と前記初期回帰式から算出される回帰値との差に基づいて標準偏差を算出すると共に、前記標準偏差が所定の許容範囲外にある測定値を異常値と判断することを特徴とするタイヤ試験装置。 A tire testing apparatus for performing a tire test on a test tire,
Including an abnormal value discriminating means for discriminating an abnormal value from the measurement value group acquired by the tire test, and
When the tire test is a uniformity test with the rotational speed as a test level and the amplitude or phase as a measurement value,
Abnormal value determination means calculates a preliminary initial regression equation that shows a correlation between the measured value and the test levels, based on the measurement value group obtained under a plurality of the test levels, and the measurement value group A tire testing apparatus characterized in that a standard deviation is calculated based on a difference from a regression value calculated from the initial regression equation, and a measured value in which the standard deviation is outside a predetermined allowable range is determined as an abnormal value. .
前記異常値判別手段が、複数の前記試験水準毎に前記測定値の標準偏差を算出すると共に当該標準偏差が所定の許容範囲にある測定値に基づいて前記初期回帰式を算出する請求項１に記載のタイヤ試験装置。 If multiple measurements are taken for a test level,
The abnormal value determining means calculates a standard deviation of the measured value for each of the plurality of test levels and calculates the initial regression equation based on a measured value in which the standard deviation is within a predetermined allowable range. The tire test apparatus as described.
前記異常診断手段は、蓄積された既存の測定値群に基づいて前記初期回帰式および前記標準偏差の算出ならびに前記異常値の判断を行うと共に前記異常値が排除された既存の測定値群に基づいて最終的な回帰式（以下、最終回帰式という。）を算出し、異常診断の対象となる複数の試験タイヤについて新規に取得された測定値群と前記最終回帰式から算出される回帰値との差に基づいて標準偏差（以下、対象標準偏差という。）を算出し、（１）複数の前記試験タイヤにかかる前記対象標準偏差群のうちの所定数以上が所定の許容範囲外にある場合にはタイヤ試験装置が異常であると判断し、（２）前記対象標準偏差群のうちの所定数未満が所定の許容範囲外にある場合には試験タイヤが異常であると判断する請求項１〜３のいずれか一つに記載のタイヤ試験装置。 Having an abnormality diagnosis means for diagnosing abnormality of the tire testing machine and the test tire, and
The abnormality diagnosis means calculates the initial regression equation and the standard deviation based on the accumulated existing measurement value group and determines the abnormal value, and based on the existing measurement value group from which the abnormal value is excluded. And calculating a final regression equation (hereinafter referred to as a final regression equation), and a newly obtained measurement value group and a regression value calculated from the final regression equation for a plurality of test tires to be subjected to abnormality diagnosis. A standard deviation (hereinafter referred to as a target standard deviation) is calculated based on the difference between the two, and (1) when a predetermined number or more of the target standard deviation groups applied to a plurality of the test tires are out of a predetermined allowable range And (2) determining that the test tire is abnormal when less than a predetermined number of the target standard deviation group is outside a predetermined allowable range. To any one of Mounting of the tire testing device.
タイヤ試験により取得された測定値群から異常値を判別する異常値判別ステップを含み、且つ、
前記タイヤ試験が回転速度を試験水準とすると共に振幅あるいは位相を測定値とするユニフォーミティ試験であるときに、
前記異常値判別ステップでは、複数の試験水準下にて取得された前記測定値群に基づいて前記試験水準と測定値との相関を示す予備的な初期回帰式が算出され、前記測定値群と前記初期回帰式から算出される回帰値との差に基づいて標準偏差が算出されると共に、前記標準偏差が所定の許容範囲外にある測定値が異常値と判断されることを特徴とするタイヤ試験方法。 A tire test method for performing a tire test on a test tire,
Including an abnormal value determination step of determining an abnormal value from the measurement value group acquired by the tire test, and
When the tire test is a uniformity test with the rotational speed as a test level and the amplitude or phase as a measurement value,
In the abnormal value determining step, preliminary initial regression equation that shows a correlation between the measured value and the test levels, based on the acquired measurement value group is calculated under a plurality of test levels, and the measurement value group A standard deviation is calculated based on a difference from a regression value calculated from the initial regression equation, and a measured value in which the standard deviation is outside a predetermined allowable range is determined as an abnormal value. Test method.
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| JP5022774B2 (en) * | 2007-05-17 | 2012-09-12 | アイシン・エィ・ダブリュ株式会社 | Inspection method and inspection apparatus |
| JP5678502B2 (en) * | 2010-07-23 | 2015-03-04 | 横浜ゴム株式会社 | Tire model creation method, tire model creation computer program, tire simulation method, and tire model creation apparatus |
| JP2012242122A (en) | 2011-05-16 | 2012-12-10 | Hitachi High-Technologies Corp | Automatic analysis device and automatic analysis program |
| JP5860485B2 (en) | 2014-01-24 | 2016-02-16 | 住友ゴム工業株式会社 | Tire rolling resistance test method and test apparatus |
| IT201800005906A1 (en) * | 2018-05-31 | 2019-12-01 | SYSTEM AND METHOD OF DETECTION OF DAMAGE TO TIRES | |
| KR102178056B1 (en) * | 2019-05-21 | 2020-11-13 | 넥센타이어 주식회사 | Tire test method using probability value |
| JP7306916B2 (en) * | 2019-08-21 | 2023-07-11 | Ｋｙｂ株式会社 | Anomaly detection system for inspection equipment |
| KR102480394B1 (en) * | 2020-12-29 | 2022-12-22 | 재단법인차세대융합기술연구원 | Apparatus and method for analyzing data, apparatus and method for predicting abnormality, computer program |
| CN113361874B (en) * | 2021-05-24 | 2023-03-28 | 纳铁福传动系统(平湖)有限公司 | Automobile part EOL test evaluation method |
| WO2024161706A1 (en) * | 2023-01-31 | 2024-08-08 | 島津産機システムズ株式会社 | Imbalance measurement device, imbalance measurement method, and imbalance measurement program |
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