Journal of Vibration and Acoustics: Recent submissions
Now showing items 1181-1200 of 3913
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Wave Propagation in Periodically Supported Nanoribbons: A Nonlocal Elasticity Approach
(The American Society of Mechanical Engineers (ASME), 2013)We develop an analytical formulation describing propagating flexural waves in periodically simply supported nanoribbons by means of Eringen's nonlocal elasticity. The nonlocal length scale is identified via atomistic finite ... -
An Accurate Spatial Discretization and Substructure Method With Application to Moving Elevator Cable Car Systems—Part I: Methodology
(The American Society of Mechanical Engineers (ASME), 2013)A spatial discretization and substructure method is developed to accurately calculate dynamic responses of onedimensional structural systems, which consist of lengthvariant distributedparameter components, such as strings, ... -
Angular Band Gaps in Sonic Crystals: Evanescent Waves and Spatial Complex Dispersion Relation
(The American Society of Mechanical Engineers (ASME), 2013)Phononic crystals are artificial materials made of a periodic distribution of solid scatterers embedded into a solid host medium with different physical properties. An interesting case of phononic crystals, known as sonic ... -
Phononic Band Gap Systems in Structural Mechanics: Finite Slender Elastic Structures and Infinite Periodic Waveguides
(The American Society of Mechanical Engineers (ASME), 2013)The paper presents a novel spectral approach, accompanied by an asymptotic model and numerical simulations for slender elastic systems such as long bridges or tall buildings. The focus is on asymptotic approximations of ... -
Topology Optimized Cloak for Airborne Sound
(The American Society of Mechanical Engineers (ASME), 2013)Directional acoustic cloaks that conceal an aluminum cylinder for airborne sound waves are presented in this paper. Subwavelength cylindrical aluminum inclusions in air constitute the cloak design to aid practical realizations. ... -
Phonon Scattering in One Dimensional Anharmonic Crystals and Superlattices: Analytical and Numerical Study
(The American Society of Mechanical Engineers (ASME), 2013)Secondorder perturbation theory based on multiple time scale analysis is used to illuminate threephonon scattering processes in the onedimensional anharmonic monoatomic crystal. Molecular dynamics simulation techniques in ... -
Analysis of Damped Bloch Waves by the Rayleigh Perturbation Method
(The American Society of Mechanical Engineers (ASME), 2013)Bloch waves in viscously damped periodic material and structural systems are analyzed using a perturbation method originally developed by Rayleigh for vibration analysis of finite structures. The extended method, called ... -
Analysis of Phononic Bandgap Structures With Dissipation
(The American Society of Mechanical Engineers (ASME), 2013)We study wave propagation in periodic materials with dissipation using two different formulations. An د‰(k)formulation yields complex frequency solutions for nonvanishing dissipation whereas a k(د‰)formulation leads to ... -
Evidence of Ultrasonic Band Gap in Aluminum Phononic Crystal Beam
(The American Society of Mechanical Engineers (ASME), 2013)In this paper, we prove theoretically and experimentally the existence of complete ultrasonic band gap in phononic crystal beam. The phononic beam structure studied is composed of a linear lattice array of square pillars ... -
Design of a Passive Controllable Negative Modulus Metamaterial With a Split Hollow Sphere of Multiple Holes
(The American Society of Mechanical Engineers (ASME), 2013)We present a passive controllable negative modulus metamaterial based on a split hollow sphere (SHS) with multiple holes. The metamaterial is obtained by changing the number of split holes. The experimental results show ... -
Complete Bandgap in Three Dimensional Holey Phononic Crystals With Resonators
(The American Society of Mechanical Engineers (ASME), 2013)In this paper, the bandgap properties of threedimensional holey phononic crystals with resonators are investigated by using the finite element method. The resonators are periodically arranged cubic lumps in the cubic holes ... -
Elastic Wave Localization in Layered Phononic Crystals With Fractal Superlattices
(The American Society of Mechanical Engineers (ASME), 2013)In this paper, localization phenomena of inplane timeharmonic elastic waves propagating in layered phononic crystals (PNCs) with different fractal superlattices are studied. For this purpose, oblique wave propagation in ... -
Band Gaps of a Two Dimensional Periodic Graphenelike Structure
(The American Society of Mechanical Engineers (ASME), 2013)This study constructs a new phononic crystal acoustic wave device that adopts a graphenelike structure and is composed of piezoelectric zinc oxide (ZnO) material. We employed the finiteelement method to determine periodic ... -
Uncertainty Propagation in the Band Gap Structure of a 1D Array of Magnetically Coupled Oscillators
(The American Society of Mechanical Engineers (ASME), 2013)The propagation constant technique has previously been used to predict band gap regions in linear oscillator chains by solving an eigenvalue problem for frequency in terms of a wave number. This paper describes a method ... -
Band Gaps in Three Dimensional Layer by Layer Phononic Crystal
(The American Society of Mechanical Engineers (ASME), 2013)In this work, we numerically investigate the existence of phononic band gaps in the layerbylayer rods structure. For the numerical calculations the finite difference time domain method was used and the transmission, as ... -
Theoretical and Experimental Study of Locally Resonant and Bragg Band Gaps in Flexural Beams Carrying Periodic Arrays of Beam Like Resonators
(The American Society of Mechanical Engineers (ASME), 2013)In this paper, we present a design of locally resonant (LR) beams using periodic arrays of beamlike resonators (or beamlike vibration absorbers) attached to a thin homogeneous beam. The main purpose of this work is twofold: ... -
Special Issue on Dynamics of Phononic Materials and Structures
(The American Society of Mechanical Engineers (ASME), 2013)The study of periodic media, including periodic materials and structures, has a long history in the field of vibrations and acoustics. Origins can be traced back to Newton's first attempt to formulate the motion of sound ... -
On Force Control of an Engine Order–Type Excitation Applied to a Bladed Disk With Underplatform Dampers
(The American Society of Mechanical Engineers (ASME), 2013)The paper presents an original multiple excitation system based on electromagnets with force control. The system is specifically designed in order to investigate the dynamics of bladed disks, since it mimics the excitation ... -
Multi Objective Optimization of Layered Elastic Metamaterials With Multiphase Microstructures
(The American Society of Mechanical Engineers (ASME), 2013)Layered elastic metamaterials, which simultaneously exhibit negative effective mass density and bulk modulus, can be obtained with a unit cell of multiphase materials. In this paper, a systematic method for the design of ... -
Kirigami Auxetic Pyramidal Core: Mechanical Properties and Wave Propagation Analysis in Damped Lattice
(The American Society of Mechanical Engineers (ASME), 2013)The work describes the manufacturing, mechanical properties, and wave propagation characteristics of a pyramidal lattice made exhibiting an auxetic (negative Poisson's ratio) behavior. Contrary to similar lattice tessellations ...