Journal of Vibration and Acoustics: Recent submissions
Now showing items 1441-1460 of 3913
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On New Aspects of Nested Carbon Nanotubes as Gigahertz Oscillators
(The American Society of Mechanical Engineers (ASME), 2011)Nested carbon nanotubes exhibit telescopic oscillatory motion with frequencies in the gigahertz range. In this paper, our previously proposed semi-analytical expression for the interaction force ... -
A Feedback and Feedforward Vibration Control for a Concrete Placing Boom
(The American Society of Mechanical Engineers (ASME), 2011)Concrete placing booms are subjected to vibrations that increase mechanical stress and reduce the boom’s working life. The aim of this paper is to develop an active control methodology to ... -
Far-Field Radiation of Tip Aerodynamic Sound Sources in Axial Fans Fitted With Passive Noise Control Features
(The American Society of Mechanical Engineers (ASME), 2011)This study investigates the causal relationship between flow aerodynamics and radiated noise in low-speed axial fans. Using blades with three distinctive tip configurations, including two that ... -
Spectral Element Approach to Wave Propagation in Uncertain Composite Beam Structures
(The American Society of Mechanical Engineers (ASME), 2011)This paper presents a study of the wave propagation responses in composite structures in an uncertain environment. Here, the main aim of the work is to quantify the effect of uncertainty in ... -
Nonlinear Dynamics and Damage Assessment of a Cantilever Beam With Breathing Edge Crack
(The American Society of Mechanical Engineers (ASME), 2011)Failures in structures and machine elements can be prevented through early detection of fatigue cracks using various nondestructive testing methods. Vibration testing forms one of the most effective ... -
A Perturbation Approach for Analyzing Dispersion and Group Velocities in Two-Dimensional Nonlinear Periodic Lattices
(The American Society of Mechanical Engineers (ASME), 2011)The paper investigates wave dispersion in two-dimensional, weakly nonlinear periodic lattices. A perturbation approach, originally developed for one-dimensional systems and extended herein, allows ... -
Dynamics of an Electromechanical System With Angular and Ferroresonant Nonlinearities
(The American Society of Mechanical Engineers (ASME), 2011)The purpose of this paper is to study the dynamics of an electromechanical system consisting of a torsion-bar or two mechanical pumps activated by an electromotor. Oscillatory solutions showing ... -
Application of Tonal Tracking to Ship Acoustic Signature Feature Identification
(The American Society of Mechanical Engineers (ASME), 2011)A ship’s radiated acoustic signature is known after a range measurement, but it changes from that the longer the ship is in-service. The Ship Signatures Management System (SSMS) provides an ... -
Influence of Nonviscous Modes on Transient Response of Lumped Parameter Systems With Exponential Damping
(The American Society of Mechanical Engineers (ASME), 2011)This paper is aimed at investigating the influence of nonviscous modes on the vibrational response of viscoelastic systems. Thus, exponential damping models are considered. Provided that nonviscous ... -
A Metamaterial Acoustic Concentrator With Regular Polygonal Cross Section
(The American Society of Mechanical Engineers (ASME), 2011)The phenomenon of near-field concentration of sound wave plays an important role in harnessing of sound wave in underwater sonar or similar devices, where high pressure field is required. ... -
Vibration Analysis of Anisotropic Simply Supported Plates by Using Variable Kinematic and Rayleigh-Ritz Method
(The American Society of Mechanical Engineers (ASME), 2011)This work deals with accurate free-vibration analysis of anisotropic, simply supported plates of square planform. Refined plate theories, which include layer-wise, equivalent single layer and zig-zag ... -
Sound Radiation from a Supersonic Jet Passing Through a Partially Open Exhaust Duct
(The American Society of Mechanical Engineers (ASME), 2011)The radiation of sound from a perfectly expanded Mach 2.5 cold supersonic jet of 25.4 mm exit diameter flowing through a partially open rigid-walled duct with an upstream J-deflector has been ... -
Modeling the Effects of the PCB Motion on the Response of Microstructures Under Mechanical Shock
(The American Society of Mechanical Engineers (ASME), 2011)Microelectromechanical systems (MEMS) are often used in portable electronic devices that are vulnerable to mechanical shock or impact, such as that induced due to accidental drops on the ground. ... -
Hydraulically Amplified Terfenol-D Actuator for Adaptive Powertrain Mounts
(The American Society of Mechanical Engineers (ASME), 2011)A magnetostrictive actuator with a stroke of ±1 mm and a blocked force of ±25 N has been developed based on a Terfenol-D driver and a hydraulic stroke amplification mechanism. A ... -
An Analytical Model for the Interaction of Mass Inclusions in Heterogeneous (HG) Blankets
(The American Society of Mechanical Engineers (ASME), 2011)The heterogeneous (HG) blanket is a passive treatment used to reduce the low frequency transmission of sound through partitions. HG blankets, glued onto a structure, consist of an elastic medium ... -
Active Vibration Control of Beams By Combining Precompressed Layer Damping and ACLD Treatment: Theory and Experimental Implementation
(The American Society of Mechanical Engineers (ASME), 2011)By attaching initially stressed poly vinyl chloride (PVC) layers on the flexible structures, necessary passive damping can be provided. Using passive constrained layers on these PVC layers, the ... -
Free-Wave Dispersion Curves of a Multi-Supported String
(The American Society of Mechanical Engineers (ASME), 2011)Free-wave propagation of an infinite, tensioned string, supported along its length by repeating segments of multiple spring-mass connections, is examined. The segments can consist of an arbitrary ... -
Model Based Analysis of Coupled Vibrations Due to the Combi-Bearing in Vertical Hydroturbogenerator Rotors
(The American Society of Mechanical Engineers (ASME), 2011)The studies presented in this paper focus on analyzing how the combined thrust-journal bearing (commonly called combi-bearing) influences the dynamics of hydropower rotors. Thrust bearing is a ... -
Morton Effect Induced Synchronous Instability in Mid-Span Rotor–Bearing Systems—Part I: Mechanism Study
(The American Society of Mechanical Engineers (ASME), 2011)The Morton Effect in rotor-bearing systems may lead to an unstable operation. In Part I, the mechanism of the Morton Effect–induced thermal instability in the mid-span rotor systems is studied. ... -
Instability Analysis in Curve Noise of Urban Railway Systems for Optimal Steering Bogie Development
(The American Society of Mechanical Engineers (ASME), 2011)This paper is primarily aimed at investigating the excitation related factors of curve noise in urban metro lines. This study is initiated within the scope of a project on the development of ...