000021678 001__ 21678
000021678 005__ 20170622131259.0
000021678 04107 $$aeng
000021678 046__ $$k2017-06-15
000021678 100__ $$aCutuli, Alfonso
000021678 24500 $$aON THE DYNAMIC BEHAVIOR OF A NONLINEAR OSCILLATOR WITH SOFTENING CHARACTERISTICS ATTACHED TO AN ELECTRO-DYNAMIC ACTUATOR

000021678 24630 $$n6.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000021678 260__ $$bNational Technical University of Athens, 2017
000021678 506__ $$arestricted
000021678 520__ $$2eng$$aThis paper presents an investigation on the dynamics involved in a two degrees of freedom system consisting of a nonlinear oscillator attached to the moving head of a linear electro-dynamic shaker. The effective stiffness of the nonlinear attachment is realized to achieve a softening force-deflection curve characteristics, and magnets are exploited to this purpose. The shaker is modelled as a linear spring-mass-damper system excited by a harmonic force with a varying excitation frequency. The attached oscillator consists of a cantilever beam with a specified mass on its tip, and it behaves linearly in the given domain of investigation. The nonlinearity is then introduced by adopting magnets in an attractive configuration acting on the tip of the beam. This has the twofold effect of reducing the linear effective stiffness and adding a negative stiffness of cubic type. The equations of motion of the system are presented, and an analytical solution in terms of amplitude-frequency equation is reported. This allows to explore the role of the key parameters involved in the system dynamics, and their effects is investigated in terms of the frequency response curve. The relationship among the non-dimensional, dimensional and physical parameters of an equivalent mechanical prototype is presented.

000021678 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000021678 653__ $$aNonlinear Vibration, Nonlinear Oscillator, Vibration Control.

000021678 7112_ $$aCOMPDYN 2017 - 6th International Thematic Conference$$cRhodes Island (GR)$$d2017-06-15 / 2017-06-17$$gCOMPDYN2017
000021678 720__ $$aCutuli, Alfonso$$iGatti, Gianluca$$iAiello, Rosario
000021678 8560_ $$ffischerc@itam.cas.cz
000021678 8564_ $$s423088$$uhttps://invenio.itam.cas.cz/record/21678/files/17485.pdf$$yOriginal version of the author's contribution as presented on CD, section: [RS11] Nonlinear dynamics
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000021678 962__ $$r21500
000021678 980__ $$aPAPER