Abstract
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 onedimensional 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 onedimensional 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 language | English (US) |
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| DOIs | |
| State | Published - 2000 |
| Event | 41st Structures, Structural Dynamics, and Materials Conference and Exhibit 2000 - Atlanta, GA, United States Duration: Apr 3 2000 → Apr 6 2000 |
Conference
| Conference | 41st Structures, Structural Dynamics, and Materials Conference and Exhibit 2000 |
|---|---|
| Country/Territory | United States |
| City | Atlanta, GA |
| Period | 4/3/00 → 4/6/00 |
All Science Journal Classification (ASJC) codes
- Civil and Structural Engineering
- Mechanics of Materials
- Building and Construction
- Architecture