<?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>2071-0054</journal-id>
<journal-title><![CDATA[Revista Ciencias Técnicas Agropecuarias]]></journal-title>
<abbrev-journal-title><![CDATA[Rev Cie Téc Agr]]></abbrev-journal-title>
<issn>2071-0054</issn>
<publisher>
<publisher-name><![CDATA[Universidad Agraria de La Habana]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2071-00542019000400003</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Evaluation of Methods to Calculate Dynamic Load Coefficients]]></article-title>
<article-title xml:lang="es"><![CDATA[Evaluación de métodos para el cálculo de coeficientes de cargas dinámicas]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Flores Moreno]]></surname>
<given-names><![CDATA[Raudel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López Canteñs]]></surname>
<given-names><![CDATA[Gilberto de Jesús]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez Rodríguez]]></surname>
<given-names><![CDATA[Arturo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Romantchik Kriuchkova]]></surname>
<given-names><![CDATA[Eugenio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández Cuello]]></surname>
<given-names><![CDATA[Geisy]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma Chapingo Departamento de Ingeniería Mecánica Agrícola ]]></institution>
<addr-line><![CDATA[Chapingo Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Agraria de La Habana Centro de Mecanización Agropecuaria ]]></institution>
<addr-line><![CDATA[San José de las Lajas Mayabeque]]></addr-line>
<country>Cuba</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2019</year>
</pub-date>
<volume>28</volume>
<numero>4</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S2071-00542019000400003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S2071-00542019000400003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S2071-00542019000400003&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Dynamic forces and impact loads usually act on agricultural machines, causing breakages or failures. That is due to the nature of the impact loads, which are of short duration and decrease the capacity of the material of absorbing the deformation energy. The calculation methods that allow obtaining dynamic load coefficients require complex operations. In the present investigation, three methodologies for obtaining dynamic load coefficients were evaluated and compared: analytical method (MA), numerical simulation by the finite element method (MEF) and experimental method (Mexp). The coefficients of dynamic loads obtained from the MEF reached a relative difference that oscillated between 3.479 and 5.112%, based on the experimental results. For the analytical method, comparedto the experimental results, a relative difference between 21.820 and 27.201% was reached, which is higher than that obtained by the numerical simulation method.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN En las máquinas agrícolas, por lo general actúan fuerzas dinámicas, en particular cargas de impacto, lo que provoca roturas o fallas frecuentes. Esto se debe al carácter impulsivo de estos tipos de cargas, las cuales presentan corta duración en el tiempo, disminuyendo la capacidad de las estructuras y piezas para absorber la energía de deformación. Los métodos de cálculo que permiten obtener los coeficientes de cargas dinámicas, requieren operaciones complejas. En la presente investigación se evalúan y comparan tres metodologías para la obtención de coeficientes de cargas dinámicas: el método analítico tradicional, la simulación numérica basada en el análisis por elementos finitos y el método experimental. Tomando los resultados obtenidos experimentalmente como base comparativa, se obtuvo que los coeficientes de cargas dinámicas obtenidos por el método analítico alcanzaron diferencias relativas al método experimental del orden de 21.82 y 27.20 %, mientras que los resultados obtenidos empleando el método de los elementos finitos alcanzaron una diferencia relativa mucho menor, la cual osciló entre 3.48 y 5.11%, demostrando este método una alta aproximación a la determinación experimental.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[elements]]></kwd>
<kwd lng="en"><![CDATA[dynamic efforts]]></kwd>
<kwd lng="en"><![CDATA[Impact loads]]></kwd>
<kwd lng="en"><![CDATA[border conditions]]></kwd>
<kwd lng="es"><![CDATA[Elementos finitos]]></kwd>
<kwd lng="es"><![CDATA[esfuerzos dinámicos]]></kwd>
<kwd lng="es"><![CDATA[Cargas de impacto]]></kwd>
<kwd lng="es"><![CDATA[condiciones de frontera]]></kwd>
</kwd-group>
</article-meta>
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