TY - JOUR
T1 - Experimental investigation of vibration localization in disordered multi-span beams
AU - Bouzit, Djamel
AU - Pierre, Christophe
PY - 1993
Y1 - 1993
N2 - The results of an experimental investigation of the effects of span length disorder on the dynamics of a mono-coupled, multi-span beam are reported. Two experimental specimen are considered: a nominally periodic twelve-span beam with equal spacing between simple supports, and the corresponding disordered beam which features slightly randomly spaced supports. Experimental results demonstrate that the transmission of vibration which takes place within the frequency passbands of the periodic beam is greatly hindered when span length randomness is introduced. The spatial localization of both the mode shapes and the steady-state harmonic response to an end excitation is observed in the disordered twelve-span beam, especially for frequencies which lie within the second passband. Very good quantitative agreement is obtained between experimental results and theoretical findings for both ordered and disordered configurations. Furthermore, an experimental estimation of the localization factor yields satisfactory agreement with the theoretical result for an infinite multi-span beam. This work reports one of the first systematic experiments carried out to demonstrate the occurrence of vibration localization in nearly periodic structures.
AB - The results of an experimental investigation of the effects of span length disorder on the dynamics of a mono-coupled, multi-span beam are reported. Two experimental specimen are considered: a nominally periodic twelve-span beam with equal spacing between simple supports, and the corresponding disordered beam which features slightly randomly spaced supports. Experimental results demonstrate that the transmission of vibration which takes place within the frequency passbands of the periodic beam is greatly hindered when span length randomness is introduced. The spatial localization of both the mode shapes and the steady-state harmonic response to an end excitation is observed in the disordered twelve-span beam, especially for frequencies which lie within the second passband. Very good quantitative agreement is obtained between experimental results and theoretical findings for both ordered and disordered configurations. Furthermore, an experimental estimation of the localization factor yields satisfactory agreement with the theoretical result for an infinite multi-span beam. This work reports one of the first systematic experiments carried out to demonstrate the occurrence of vibration localization in nearly periodic structures.
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U2 - 10.2514/6.1993-1487
DO - 10.2514/6.1993-1487
M3 - Conference article
AN - SCOPUS:0027259922
SN - 0161-5750
SP - 1565
EP - 1577
JO - Collection of Technical Papers - AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference
JF - Collection of Technical Papers - AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference
IS - pt 3
T2 - 34th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference
Y2 - 19 April 1993 through 22 April 1993
ER -