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dc.contributor.authorBrasil, R. M L R F-
dc.contributor.authorBalthazar, José Manoel-
dc.contributor.authorFeitosa, L. C.-
dc.identifier.citation2007 Proceedings of the ASME International Design Engineering Technical Conferences and Computers and Information in Engineering Conference, DETC2007, v. 5 PART C, p. 1721-1725.-
dc.description.abstractIn this paper, a mathematical model is derived via Lagrange's Equation for a shear building structure that acts as a foundation of a non-ideal direct current electric motor, controlled by a mass loose inside a circular carving. Non-ideal sources of vibrations of structures are those whose characteristics are coupled to the motion of the structure, not being a function of time only as in the ideal case. Thus, in this case, an additional equation of motion is written, related to the motor rotation, coupled to the equation describing the horizontal motion of the shear building. This kind of problem can lead to the so-called Sommerfeld effect: steady state frequencies of the motor will usually increase as more power (voltage) is given to it in a step-by-step fashion. When a resonance condition with the structure is reached, the better part of this energy is consumed to generate large amplitude vibrations of the foundation without sensible change of the motor frequency as before. If additional increase steps in voltage are made, one may reach a situation where the rotor will jump to higher rotation regimes, no steady states being stable in between. As a device of passive control of both large amplitude vibrations and the Sommerfeld effect, a scheme is proposed using a point mass free to bounce back and forth inside a circular carving in the suspended mass of the structure. Numerical simulations of the model are also presented Copyright © 2007 by ASME.en
dc.subjectDirect current (dc)-
dc.subjectEquation of motion-
dc.subjectFunction of time-
dc.subjecthorizontal motions-
dc.subjectIn between-
dc.subjectinternational conferences-
dc.subjectInternational designs-
dc.subjectLagrange's equations-
dc.subjectlarge amplitude vibrations-
dc.subjectLimited power supply-
dc.subjectMotor rotation-
dc.subjectMulti-body system (MBS)-
dc.subjectNon ideal sources-
dc.subjectNon-linear dynamics-
dc.subjectNumerical simulations-
dc.subjectPassive control-
dc.subjectpoint masses-
dc.subjectresonance conditions-
dc.subjectshear buildings-
dc.subjectSommerfeld effect-
dc.subjectSteady states-
dc.subjectSuspended mass-
dc.subjectTechnical conferences-
dc.subjectArchitectural design-
dc.subjectComputer control-
dc.subjectComputer networks-
dc.subjectComputer simulation-
dc.subjectControl systems-
dc.subjectDC motors-
dc.subjectDynamical systems-
dc.subjectElectric machinery-
dc.subjectElectric motors-
dc.subjectElectric potential-
dc.subjectEquations of motion-
dc.subjectFunction evaluation-
dc.subjectInformation systems-
dc.subjectLattice vibrations-
dc.subjectMachine design-
dc.subjectMathematical models-
dc.subjectNonlinear programming-
dc.subjectPassive networks-
dc.subjectPhotoacoustic effect-
dc.subjectShearing machines-
dc.subjectStructural analysis-
dc.subjectVibrations (mechanical)-
dc.subjectStructural design-
dc.titleA structure excited by a DC motor of limited power supply and controlled by a pendulum like deviceen
dc.contributor.institutionUniversidade de São Paulo (USP)-
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)-
dc.description.affiliationPolytechnique School USP, SP-
dc.description.affiliationDEMAC-IGCE-UNESP, Rio Claro, SP-
dc.description.affiliationUnespDEMAC-IGCE-UNESP, Rio Claro, SP-
dc.rights.accessRightsAcesso restrito-
dc.relation.ispartof2007 Proceedings of the ASME International Design Engineering Technical Conferences and Computers and Information in Engineering Conference, DETC2007-
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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