Analysis and design of high frequency periodically layered isolators in compression

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Detailed finite element modal analysis of layered isolators is conducted to gain an improved understanding of three-dimensional effects in compression. Layered isolators exhibit transmissibility 'stop bands', or frequency ranges with very low transmissibility. Comparison between one-dimensional theory based on Floquet analysis and the three-dimensional finite element analysis indicates that stop band frequencies predicted using one-dimensional results can be highly inaccurate. Errors for isolators studied in this investigation were between 17-70%. Experimentally transmissibility measurements are obtained for two different layered isolators. Both isolators exhibit pronounced attenuation within stop band frequencies. Good correlation between three-dimensional finite element analysis and experimental data is obtained. Contrary to earlier one-dimensional analyses, material damping can play a significant role in peak attenuation levels. An efficient one-dimensional analysis of layered isolators is developed. This analysis incorporates table look-up frequency corrections to account for three-dimensional elastic effects. A design optimization methodology is then developed for layered isolators subject to quasi-static stiffness constraints. A simulated annealing algorithm is employed to determine optimal material properties and layer thicknesses.

Original languageEnglish (US)
Pages (from-to)306-321
Number of pages16
JournalCollection of Technical Papers - AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference
Issue numberI
StatePublished - 2000

All Science Journal Classification (ASJC) codes

  • Architecture


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