<p>Conventional control charts often assume normality, which may not hold for many engineering processes. In cases where processes follow an Inverse Maxwell <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="44199_2025_110_Article_IEq1.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="35" /> </InlineMediaObject> <EquationSource Format="TEX">\(\left( {{\text{IM}}} \right)\)</EquationSource> <EquationSource Format="MATHML"><math> <mfenced close=")" open="("> <mtext>IM</mtext> </mfenced> </math></EquationSource> </InlineEquation> distribution, as seen in various industrial applications, it becomes crucial to employ suitable monitoring methods. To address this gap, this study introduces the hybrid exponentially weighted moving average (<InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="44199_2025_110_Article_IEq2.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="83" /> </InlineMediaObject> <EquationSource Format="TEX">\({\text{HEWMA}}_{{{\text{IM}}}}\)</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mtext>HEWMA</mtext> <mtext>IM</mtext> </msub> </math></EquationSource> </InlineEquation>) chart for the <InlineEquation ID="IEq3"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="44199_2025_110_Article_IEq3.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="22" /> </InlineMediaObject> <EquationSource Format="TEX">\({\text{IM}}\)</EquationSource> <EquationSource Format="MATHML"><math> <mtext>IM</mtext> </math></EquationSource> </InlineEquation> distribution. Performance evaluation includes metrics like average run length, median run length, and standard deviation run length. Comparative analysis with existing IM distribution-based charts such as the Shewhart V chart (<InlineEquation ID="IEq4"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="44199_2025_110_Article_IEq4.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="29" /> </InlineMediaObject> <EquationSource Format="TEX">\({\text{V}}_{{{\text{IM}}}}\)</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mtext>V</mtext> <mtext>IM</mtext> </msub> </math></EquationSource> </InlineEquation>), exponentially weighted moving average (<InlineEquation ID="IEq5"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="44199_2025_110_Article_IEq5.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="71" /> </InlineMediaObject> <EquationSource Format="TEX">\({\text{EWMA}}_{{{\text{IM}}}}\)</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mtext>EWMA</mtext> <mtext>IM</mtext> </msub> </math></EquationSource> </InlineEquation>), and extended EWMA (<InlineEquation ID="IEq6"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="44199_2025_110_Article_IEq6.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="82" /> </InlineMediaObject> <EquationSource Format="TEX">\({\text{EEWMA}}_{{{\text{IM}}}}\)</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mtext>EEWMA</mtext> <mtext>IM</mtext> </msub> </math></EquationSource> </InlineEquation>) charts reveal the <InlineEquation ID="IEq7"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="44199_2025_110_Article_IEq2.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="83" /> </InlineMediaObject> <EquationSource Format="TEX">\({\text{HEWMA}}_{{{\text{IM}}}}\)</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mtext>HEWMA</mtext> <mtext>IM</mtext> </msub> </math></EquationSource> </InlineEquation> chart’s superior efficiency. Real-world applications in brake pad production and carbon fiber strength testing validate its practicality and engineering applications. In conclusion, <InlineEquation ID="IEq8"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="44199_2025_110_Article_IEq2.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="83" /> </InlineMediaObject> <EquationSource Format="TEX">\({\text{HEWMA}}_{{{\text{IM}}}}\)</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mtext>HEWMA</mtext> <mtext>IM</mtext> </msub> </math></EquationSource> </InlineEquation> is a novel tool tailored to monitor <InlineEquation ID="IEq9"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="44199_2025_110_Article_IEq3.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="22" /> </InlineMediaObject> <EquationSource Format="TEX">\({\text{IM}}\)</EquationSource> <EquationSource Format="MATHML"><math> <mtext>IM</mtext> </math></EquationSource> </InlineEquation> processes efficiently, offering enhanced process monitoring for diverse industries.</p> Graphical abstract <p></p>

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An Enhanced EWMA Model for Statistical Insights in Process Monitoring with Application in Brake Pad Failure and Carbon Fiber Strength

  • Muhammad Waqas,
  • Song Hua Xu,
  • Syed Masroor Anwar,
  • Zahid Rasheed,
  • Gilbert Masengo

摘要

Conventional control charts often assume normality, which may not hold for many engineering processes. In cases where processes follow an Inverse Maxwell \(\left( {{\text{IM}}} \right)\) IM distribution, as seen in various industrial applications, it becomes crucial to employ suitable monitoring methods. To address this gap, this study introduces the hybrid exponentially weighted moving average ( \({\text{HEWMA}}_{{{\text{IM}}}}\) HEWMA IM ) chart for the \({\text{IM}}\) IM distribution. Performance evaluation includes metrics like average run length, median run length, and standard deviation run length. Comparative analysis with existing IM distribution-based charts such as the Shewhart V chart ( \({\text{V}}_{{{\text{IM}}}}\) V IM ), exponentially weighted moving average ( \({\text{EWMA}}_{{{\text{IM}}}}\) EWMA IM ), and extended EWMA ( \({\text{EEWMA}}_{{{\text{IM}}}}\) EEWMA IM ) charts reveal the \({\text{HEWMA}}_{{{\text{IM}}}}\) HEWMA IM chart’s superior efficiency. Real-world applications in brake pad production and carbon fiber strength testing validate its practicality and engineering applications. In conclusion, \({\text{HEWMA}}_{{{\text{IM}}}}\) HEWMA IM is a novel tool tailored to monitor \({\text{IM}}\) IM processes efficiently, offering enhanced process monitoring for diverse industries.

Graphical abstract