... acoustic metamaterial stopband and band gap vibration absorption local mechanical resonance periodic structures wave propagation materials in vibration and acoustics propagation and radiation smart materials and structures structural acoustics structural dynamics and control Over recent...

...S. Ali Faghidian; Isaac Elishakoff A size-dependent elasticity theory, founded on variationally consistent formulations, is developed to analyze the wave propagation in nanosized beams. The mixture unified gradient theory of elasticity, integrating the stress gradient theory, the strain gradient...

...Hao Gao; Yegao Qu; Guang Meng Phononic crystals are periodically engineered structures with special acoustic properties that natural materials cannot have. One typical feature of phononic crystals is the emergence of band gaps wherein the wave propagation is prohibited due to the spatial...

... of the U.S. Government. ASME disclaims all interest in the U.S. Government’s contributions. elastic metamaterials phononic materials Hopkinson bar wave propagation Mechanical shock events can be reproduced in the laboratory using Hopkinson bar tests. Hopkinson bar tests are commonly used...

...Pengcheng Zhao; Kai Zhang; Cheng Zhao; Zichen Deng Fractal lattice is a kind of lattices with multifunctional physical characteristics and superior mechanical properties. The wave propagation of the triangular lattice with Koch fractal is calculated by the finite element method and Bloch theorem...

... of a wave propagating in nonlinear periodic chains, particularly, a cell with multiple nonlinear resonators. This problem is investigated here. Our study examines both hardening and softening nonlinearities in the chains and in the local resonators. Explicit expressions for the nonlinear dispersion...

... vibration control vibration isolation wave propagation In the past decade, the study of metamaterials based on periodic structures has drastically increased in the wave propagation field. The ability of these metastructures in the formation of bandgaps and the location of them at the required...

..., bandwidth, and power flow are also studied. sandwich beam wave propagation attenuation power flow internal absorbers Sandwich structures commonly used to construct many marine composite structures are lightweight and are efficient in taking bending loads but are relatively weak...

... , Propagation of Sound in Porous Media: Modelling Sound Absorbing Materials , 2nd ed. , Wiley , New York . [10] Carcione , J. , 2007 , “ Wave Fields in Real Media: Wave Propagation in Anisotropic, Anelastic, Porous and Electromagnetic Media ,” Handbook of Geophysical Exploration: Seismic...

... to demonstrate the variation of the reflection and transmission coefficients with different incident angles, frequencies, and boundary conditions, which could be useful to nondestructive evaluation of this novel material structure based on wave propagations. As the basic parameters of ultrasonic waves...

... , “ Mathematical Modeling of Railway-Induced Ground Vibrations ,” Proceedings, 2nd International Workshop WAVE 2000-Wave Propagation-Moving Load-Vibration Reduction , Ruhr University Bochum , December 13–15...

... of the resulting matrices in the FEM is considerably reduced leading to a significant decrease in computational effect. Curves of propagation constant versus natural frequencies have been obtained for axial wave propagation of a multi supported curved panel of infinite length. From these curves, frequencies...

...A. Baz Conventional passive periodic structures exhibit unique dynamic characteristics that make them act as mechanical filters for wave propagation. As a result, waves can propagate along the periodic structures only within specific frequency bands called the “Pass Bands” and wave propagation...

...M. Ruzzene; A. Baz Longitudinal wave propagation is controlled using shape memory inserts placed periodically along rods. The inserts act as sources of impedance mismatch with tunable characteristics. Such characteristics are attributed to the unique behavior of the shape memory alloy whereby...