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Access Type
WSU Access
Date of Award
1-1-2010
Degree Type
Thesis
Degree Name
M.S.
Department
Mechanical Engineering
First Advisor
Golam M. Newaz
Abstract
The effects of negative effective mass density and negative effective elastic modulus on energy absorption have been investigated experimentally and numerically. It is noteworthy that the classical continuum mechanics support the concept of negative effective elastic modulus of artificially designed vibro - acoustic metamaterial. Both the negative effective mass density and the effective negative elastic modulus are frequency dependent and are shown up near the natural frequencies of the complex structure. The physical structure has been designed in such a fashion so that only longitudinal planar waves at a frequency of 0 - 20 kHz can propagate throughout the system. The free - free vibration testing has been conducted to evaluate the natural frequencies of the complex system and to determine the negative effective mass density near resonances. Moreover, the numerical platform is based on acoustic - structural interaction physics. By performing frequency analysis, the negative effective elastic modulus of the complex structure, which demonstrates the energy absorption phenomenon, has been found numerically.
Recommended Citation
Islam, Md Tofiqul, "Analysis And Evaluation Of A Vibro-Acoustic Metamaterial" (2010). Wayne State University Theses. 62.
https://digitalcommons.wayne.edu/oa_theses/62