220 Bifurcation Control for the Buckling in an Axially Compressed Beam : Actuation of the bifurcation point by using High-Frequency Excitation

Abstract

Beam is one of the fundamental elements 正 n cQmplex structures ． It is very significant to clarif セ its sta ． bilitY under the various circumstances ， In p 卸 rticular ， the buckllng phenomenon7 wh 量 ch ls characterized as a pitchfc )rk bifurcatien ， has accepted much interes亀 by many researchers ， In this paper， we propose astabilization method fbr the first −mode buckling phenQmenon in the clamped − clamped beam ． Fc｝r the buckling phenomenon in this system ， we propose a stabilization control method without feedback controL High frequency excitation shifts the bifurcation point and carries out the escape from the buckling state ． FhJrthermore ， the vahd 量 ty of the stabilization method with high frequency excitation is experimentally con 丘 rmed by applying the theore 七 ically Proposed control method to a buckled beam under the compressive 丘〕rce ．