TY - GEN
T1 - Effect of feedback delays on nonlinear vibrations of cantilever beams
AU - Daqaq, Mohammed F.
AU - Alhazza, Khaled A.
AU - Stanton, Samuel
PY - 2008
Y1 - 2008
N2 - The authors present a comprehensive investigation of the effect of feedback delays on the nonlinear vibrations of piezoelectrically-actuated cantilever beams. More specifically, in the first part of this work, we examine the free response of a cantilever beam subjected to delayed-acceleration feedback. We characterize the stability of the trivial solutions and determine the normal form of the bifurcation at the stability boundary. We show that the trivial solutions lose stability via a Hopf bifurcation leading to limit-cycle oscillations (LCO). We assess the stability of the resulting LCO close to the stability boundary by determining the nature of the Hopf bifurcation (sub-or supercritical). We show that the bifurcation type depends only on the frequency of the delayed-response at the bifurcation point and the coefficients of the beam geometric and inertia nonlinearities. To analyze the stability of the LCO in the postbifurcation region, we utilize the Method of Harmonic Balance and the Floquet Theory. We observe that, increasing the gain magnitude for certain feedback delays may culminate in a chaotic response. In the second part of this study, we analyze the effect of feedback delays on a cantilever beam subjected to primary base excitations. We find that the nature of the forced response is largely determined by the stability of the trivial solutions of the unforced response. For stable trivial solutions (i.e., inside the stability boundaries of the linear system), the free response emanating from delayed feedback diminishes leaving only the particular solution resulting from the external excitation. In that case, delayed feedback acts as a vibration absorber. On the other hand, for unstable trivial solutions, the response contains two coexisting frequencies. Therefore, depending on the excitation amplitude and the closeness of the frequency of the delayed response to the excitation frequency, the response is either periodic or quasiperiodic. Finally, we study the effect of higher vibration modes on the beam response. We show that the validity of a single-mode analysis is dependent on the gain-delay combination utilized for feedback as well as the position and size of the piezoelectric patch.
AB - The authors present a comprehensive investigation of the effect of feedback delays on the nonlinear vibrations of piezoelectrically-actuated cantilever beams. More specifically, in the first part of this work, we examine the free response of a cantilever beam subjected to delayed-acceleration feedback. We characterize the stability of the trivial solutions and determine the normal form of the bifurcation at the stability boundary. We show that the trivial solutions lose stability via a Hopf bifurcation leading to limit-cycle oscillations (LCO). We assess the stability of the resulting LCO close to the stability boundary by determining the nature of the Hopf bifurcation (sub-or supercritical). We show that the bifurcation type depends only on the frequency of the delayed-response at the bifurcation point and the coefficients of the beam geometric and inertia nonlinearities. To analyze the stability of the LCO in the postbifurcation region, we utilize the Method of Harmonic Balance and the Floquet Theory. We observe that, increasing the gain magnitude for certain feedback delays may culminate in a chaotic response. In the second part of this study, we analyze the effect of feedback delays on a cantilever beam subjected to primary base excitations. We find that the nature of the forced response is largely determined by the stability of the trivial solutions of the unforced response. For stable trivial solutions (i.e., inside the stability boundaries of the linear system), the free response emanating from delayed feedback diminishes leaving only the particular solution resulting from the external excitation. In that case, delayed feedback acts as a vibration absorber. On the other hand, for unstable trivial solutions, the response contains two coexisting frequencies. Therefore, depending on the excitation amplitude and the closeness of the frequency of the delayed response to the excitation frequency, the response is either periodic or quasiperiodic. Finally, we study the effect of higher vibration modes on the beam response. We show that the validity of a single-mode analysis is dependent on the gain-delay combination utilized for feedback as well as the position and size of the piezoelectric patch.
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U2 - 10.1115/DETC2007-35085
DO - 10.1115/DETC2007-35085
M3 - Conference contribution
AN - SCOPUS:44949117641
SN - 0791848027
SN - 9780791848029
SN - 079184806X
SN - 9780791848067
T3 - 2007 Proceedings of the ASME International Design Engineering Technical Conferences and Computers and Information in Engineering Conference, DETC2007
SP - 757
EP - 769
BT - 2007 Proceedings of the ASME International Design Engineering Technical Conferences and Computers and Information in Engineering Conference, DETC2007
T2 - 6th International Conference on Multibody Systems, Nonlinear Dynamics and Control, presented at - 2007 ASME International Design Engineering Technical Conferences and Computers and Information in Engineering Conference, IDETC/CIE2007
Y2 - 4 September 2007 through 7 September 2007
ER -