<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0121-750X</journal-id>
<journal-title><![CDATA[Ingeniería]]></journal-title>
<abbrev-journal-title><![CDATA[ing.]]></abbrev-journal-title>
<issn>0121-750X</issn>
<publisher>
<publisher-name><![CDATA[Universidad Distrital Francisco José de Caldas]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0121-750X2025000200005</article-id>
<article-id pub-id-type="doi">10.14483/23448393.22926</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Theoretical-Experimental Modal Analysis of a Flexible Rotor Based on the Jeffcott Model]]></article-title>
<article-title xml:lang="es"><![CDATA[Análisis modal teórico-experimental de un rotor flexible basado en el modelo de Jeffcott]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ruíz-Rodríguez]]></surname>
<given-names><![CDATA[Javier Hernando]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Morales-Hernández]]></surname>
<given-names><![CDATA[Brian Farid]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sánchez-Acevedo]]></surname>
<given-names><![CDATA[Heller Guillermo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Industrial de Santander Department of Mechanical Engineering ]]></institution>
<addr-line><![CDATA[Bucaramanga ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Industrial de Santander Department of Mechanical Engineering ]]></institution>
<addr-line><![CDATA[Bucaramanga ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Industrial de Santander Department of Mechanical Engineering ]]></institution>
<addr-line><![CDATA[Bucaramanga ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2025</year>
</pub-date>
<volume>30</volume>
<numero>2</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0121-750X2025000200005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0121-750X2025000200005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0121-750X2025000200005&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Context:  Rotating equipment that operates at high speeds or handles significant loads is designed based on the concept of flexible shafts. This is the case with turbines, compressors, and turbopumps, among others. The theoretical-experimental modal analysis of these shafts is crucial for ensuring a safe and efficient operation, as well as for identifying appropriate maintenance strategies.  Method:  In this work, we perform both theoretical and experimental modal analyses of an isotropic flexible rotor based on the Jeffcott model. The theoretical modal analysis is carried out using a numerical model with conditions similar to those of the experimental analysis. The results are compared using the modal assurance criterion (MAC). The validated numerical model enables the evaluation of eigenfrequencies and their associated modal shapes.  Results:  The first two bending natural modes of the flexible rotor were obtained from the theoretical and experimental modal analysis, and the mode shapes and natural frequencies were determined. The mode shapes were correlated, exhibiting a correlation value greater than 88%, thus validating the numerical model.  Conclusions:  This approach not only enhances the understanding of the shaft&#8217;s dynamic response but also contributes to improved decision-making during the design and operation stages of rotating systems in various industrial applications.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Contexto:  El equipo rotativo que opera a altas velocidades o maneja cargas significativas se diseña con base en el concepto de ejes flexibles. Este es el caso de las turbinas, los compresores y las turbobombas, entre otros. El análisis modal teórico-experimental de estos ejes es esencial para garantizar una operación segura y eficiente, así como para identificar estrategias de mantenimiento adecuadas.  Método:  En este trabajo desarrollamos análisis modales tanto teóricos como experimentales de un rotor flexible isotrópico basado en el modelo de Jeffcott. El análisis modal teórico se realiza utilizando un modelo numérico con condiciones similares a las del análisis experimental. Los resultados se comparan utilizando el criterio de aseguramiento modal (MAC). El modelo numérico validado permite evaluar las frecuencias propias y sus formas modales asociadas.  Resultados:  Se obtuvieron los dos primeros modos naturales de flexión del rotor flexible del análisis modal teórico y experimental, y se determinaron las formas modales y las frecuencias naturales. Las formas modales estuvieron correlacionadas, obteniendo un valor de correlación superior al 88%, lo que valida el modelo numérico.  Conclusiones:  Este enfoque no solo mejora la comprensión de la respuesta dinámica del eje, sino que también contribuye a mejorar la toma de decisiones durante las etapas de diseño y operación de sistemas rotativos en diversas aplicaciones industriales.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[experimental modal analysis]]></kwd>
<kwd lng="en"><![CDATA[theoretical modal analysis]]></kwd>
<kwd lng="en"><![CDATA[natural frequencies]]></kwd>
<kwd lng="en"><![CDATA[MAC]]></kwd>
<kwd lng="en"><![CDATA[vibration mode shapes]]></kwd>
<kwd lng="en"><![CDATA[flexible rotors]]></kwd>
<kwd lng="en"><![CDATA[Jeffcott rotor]]></kwd>
<kwd lng="es"><![CDATA[análisis modal experimental]]></kwd>
<kwd lng="es"><![CDATA[análisis modal teórico]]></kwd>
<kwd lng="es"><![CDATA[frecuencias naturales]]></kwd>
<kwd lng="es"><![CDATA[MAC]]></kwd>
<kwd lng="es"><![CDATA[modos de vibración]]></kwd>
<kwd lng="es"><![CDATA[rotores flexibles]]></kwd>
<kwd lng="es"><![CDATA[rotor de Jeffcott]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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<name>
<surname><![CDATA[Zhou]]></surname>
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<article-title xml:lang=""><![CDATA[Active magnetic bearing rotor model updating using resonance and MAC error]]></article-title>
<source><![CDATA[Shock Vibr]]></source>
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</article>
