<?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>0035-001X</journal-id>
<journal-title><![CDATA[Revista mexicana de física]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. fis.]]></abbrev-journal-title>
<issn>0035-001X</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Física]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0035-001X2008000400001</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[A hamiltonian control approach for the stabilization of the angular velocity of a rigid body system controlled by two torques]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aguilar-Ibáñez]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Suárez-Castañón]]></surname>
<given-names><![CDATA[M.S.]]></given-names>
</name>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Guzmán-Aguilar]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Instituto del Politécnico Nacional Centro de Investigación en Computación ]]></institution>
<addr-line><![CDATA[México D.F.]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2008</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2008</year>
</pub-date>
<volume>54</volume>
<numero>4</numero>
<fpage>265</fpage>
<lpage>270</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2008000400001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2008000400001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2008000400001&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[We present a Hamiltonian control approach for the stabilization of a rigid body system that is controlled by two torques. The stabilization strategy consists in solving a feasible matching condition in order to derive a feedback controller which forces the closed-loop system to be globally asymptotically stable.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Presentamos un enfoque de control Hamiltoniano para la estabilización de un sistema de cuerpo rígido que es controlado por dos torques. La estrategia de control consiste en resolver una condición de acoplamiento conveniente con el fin de derivar un eontrolador de retroalimentaeión que haga al sistema en lazo cerrado global y asintóticamente estable.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Control of rigid body system]]></kwd>
<kwd lng="en"><![CDATA[nonlinear control]]></kwd>
<kwd lng="en"><![CDATA[Lyapunov stability]]></kwd>
<kwd lng="es"><![CDATA[Control de un sistema de cuerpo rígido]]></kwd>
<kwd lng="es"><![CDATA[control no-lineal]]></kwd>
<kwd lng="es"><![CDATA[estabilidad de Lyapunov]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">Carta</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><b>A hamiltonian control approach for the stabilization of the angular velocity of a rigid body system controlled by two torques</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>C. Aguilar&#150;Ib&aacute;&ntilde;ez<sup>a,</sup>*, M.S. Su&aacute;rez&#150;Casta&ntilde;&oacute;n<sup>b</sup> and F. Guzm&aacute;n&#150;Aguilar<sup>c</sup></b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i>&ordf; Centro de Investigaci&oacute;n en Computaci&oacute;n, Instituto del Polit&eacute;cnico Nacional, </i><i>Av. Juan de Dios B&aacute;tiz s/n ,Esq. Miguel Oth&oacute;n de M., </i><i>Unidad Profesional Adolfo L&oacute;pez Mateos, Col. Nueva Industrial Vallejo, </i><i>Apartado Postal 75476 M&eacute;xico, D.F. 07738, M&eacute;xico, </i><i>FAX: +(52) 55 5586&#150;2936.</i></font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>b</sup> Escuela Superior de C&oacute;mputo del Instituto Polit&eacute;cnico Nacional.</i></font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>c</sup> Escuela Superior de F&iacute;sica y Matem&aacute;ticas del Instituto Polit&eacute;cnico Nacional.</i></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">* <b>To whom correspondence should be addressed: </b>    <br> (<a href="mailto:caguilar@cic.ipn.mx">caguilar@cic.ipn.mx</a>).</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">Recibido el 30 de julio de 2007    <br>   Aceptado el 29 de julio de 2008</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>     <p align="justify"><font face="verdana" size="2">We present a Hamiltonian control approach for the stabilization of a rigid body system that is controlled by two torques. The stabilization strategy consists in solving a feasible matching condition in order to derive a feedback controller which forces the closed&#150;loop system to be globally asymptotically stable.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Keywords:</b>  Control of rigid body system; nonlinear control; Lyapunov stability.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>     <p align="justify"><font face="verdana" size="2">Presentamos un enfoque de control Hamiltoniano para la estabilizaci&oacute;n de un sistema de cuerpo r&iacute;gido que es controlado por dos torques. La estrategia de control consiste en resolver una condici&oacute;n de acoplamiento conveniente con el fin de derivar un eontrolador de retroalimentaei&oacute;n que haga al sistema en lazo cerrado global y asint&oacute;ticamente estable.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Descriptores: </b>Control de un sistema de cuerpo r&iacute;gido; control no&#150;lineal; estabilidad de Lyapunov. </font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">PACS: 05.45.&#150;a; 45.40.&#150;f; 45.20.Jj; 45.40.Cc</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><a href="/pdf/rmf/v54n4/v54n4a1.pdf" target="_blank">DESCARGAR ART&Iacute;CULO EN FORMATO PDF</a></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Acknowledgements</b></font></p>     <p align="justify"><font face="verdana" size="2">This work was supported by the Centro de Investigaci&oacute;n en Computaci&oacute;n del Instituto Polit&eacute;cnico Nacional and by the Secretar&iacute;a de Investigaci&oacute;n y Posgrado (SIP-IPN) under research grants 20071088, 20071109, 20082694 and 200882887.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Florencio Guzm&aacute;n wishes to thank the Escuela Superior de F&iacute;sica y Matem&aacute;ticas of the Instituto Polit&eacute;cnico Nacional, where he is a doctoral student.</font></p>     <p align="justify"><font face="verdana" size="2">Miguel S. Su&aacute;rez wishes to thank the Instituto Polit&eacute;cnico Nacional and the Fondo para el Desarrollo de Recursos Humanos del Banco de M&eacute;xico for on his postdoctoral stay at the University of Houston possible. Part of this work was done while M. Su&aacute;rez was making its posdoctoral stay.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>References</b></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">1. R. Ortega, M. Spong, F. Gomez, and G. Blankenstein, <i>IEEE Trans. Aut. 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