Journal of Vibration and Acoustics: Recent submissions
Now showing items 1101-1120 of 3913
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Acoustic Source Characterization for Prediction of Medium Speed Diesel Engine Exhaust Noise
(The American Society of Mechanical Engineers (ASME), 2014)To achieve reliable results when simulating the acoustics of the internal combustion engine (ICengine) exhaust system and its components, the source characteristics of the engine must be known. In the low frequency range ... -
The Power and Efficiency Limits of Piezoelectric Energy Harvesting
(The American Society of Mechanical Engineers (ASME), 2014)The fundamental limits of cantilevered piezoelectric energy harvesters have not been well established. As with any other power generation technology, it is critical to establish the limits of power output and efficiency. ... -
Computational Fluid Dynamics Based Numerical Analysis of Acoustic Attenuation and Flow Resistance Characteristics of Perforated Tube Silencers
(The American Society of Mechanical Engineers (ASME), 2014)The 3D timedomain computational fluid dynamics (CFD) approach is used to calculate the acoustic attenuation performance of perforated tube silencers without and with flow. For the crossflow perforated tube silencer and ... -
Degenerate “Star†Bifurcations in a Twinkling Oscillator
(The American Society of Mechanical Engineers (ASME), 2014)We have studied a nonlinear springmass chain loaded by a quasistatic pull. The spring forces are assumed to be cubic with intervals of negative stiffness. Depending on the parameters, the system has multiple equilibria. ... -
Draft: Stick Slip Motions of a Rotor Stator System
(The American Society of Mechanical Engineers (ASME), 2014)In the current study, the authors examine the torsional vibrations of a rotor enclosed within a stator subjected to dry friction. Through the experiments, it is demonstrated that forward whirling of the rotor occurs while ... -
Modal Analysis of General Plate Structures
(The American Society of Mechanical Engineers (ASME), 2014)A general analytical method, referred to as the Fourier spectral element method, is presented for the dynamic analysis of plate structures consisting of any number of arbitrarily oriented rectangular plates. The compatibility ... -
Constrained Design Optimization of Vibration Energy Harvesting Devices
(The American Society of Mechanical Engineers (ASME), 2014)Existing design criteria for vibration energy harvesting systems provide guidance on the appropriate selection of the seismic mass and load resistance. To harvest maximum power in resonant devices, the mass needs to be as ... -
Numerical Evaluation of High Order Modes for Stepped Beam
(The American Society of Mechanical Engineers (ASME), 2014)The numerical evaluation of highorder modes of a uniform Euler–Bernoulli beam has been studied by reformatting the classical expression of mode shapes. That method, however, is inapplicable to a stepped beam due to the ... -
Simulation of Micromechanical Measurement of Mass Accretion: Quantifying the Importance of Material Selection and Geometry on Performance
(The American Society of Mechanical Engineers (ASME), 2014)Microand nanomechanical resonators operating in liquid have been used to measure the change in the mass of either cells or functionalized surfaces attached to the resonator. As the system accretes mass, the natural frequency ... -
Acoustic Field in Ducts With Sinusoidal Area Variation
(The American Society of Mechanical Engineers (ASME), 2014)The purpose of this article is to provide an analytical solution for the acoustic field in a duct with sinusoidal area variation along the length. The equation describing the acoustic field in a variable area duct is a ... -
Energy Harvesting of Piezoelectric Stack Actuator From a Shock Event
(The American Society of Mechanical Engineers (ASME), 2014)The energy harvesting performance of a piezoelectric stack actuator under a shock event is theoretically and experimentally investigated. The first method is derived from the single degree of freedom constitutive equations, ... -
Multimode Fluid Elastic Instability of Heat Exchanger Tubes
(The American Society of Mechanical Engineers (ASME), 2014)Multimode fluid elastic instability analysis is made of heat exchanger tubes in cross flow. The stability analysis predicts that the flow velocity for onset of tube instability in nonuniform flow is lowered by participation ... -
A Simple Statistical Energy Analysis Technique on Modeling Continuous Coupling Interfaces
(The American Society of Mechanical Engineers (ASME), 2014)In statistical energy analysis (SEA) modeling, it is desirable that the SEA coupling loss factors (CLFs) between two continuously connected subsystems can be estimated in a convenient way. A simple SEA modeling technique ... -
Sustained High Frequency Dynamic Instability of a Nonlinear System of Coupled Oscillators Forced by Single or Repeated Impulses: Theoretical and Experimental Results
(The American Society of Mechanical Engineers (ASME), 2014)This report describes the impulsive dynamics of a system of two coupled oscillators with essential (nonlinearizable) stiffness nonlinearity. The system considered consists of a grounded weakly damped linear oscillator ... -
Vibration Modes and Natural Frequency Veering in Three Dimensional, Cyclically Symmetric Centrifugal Pendulum Vibration Absorber Systems
(The American Society of Mechanical Engineers (ASME), 2014)This paper investigates the vibration mode structure of threedimensional, cyclically symmetric centrifugal pendulum vibration absorber (CPVA) systems. The rotor in the system has two translational, one rotational, and two ... -
Frequency Tuning of a Nonlinear Electromagnetic Energy Harvester
(The American Society of Mechanical Engineers (ASME), 2014)This paper investigates a frequencytunable nonlinear electromagnetic energy harvester. The electromagnetic harvester mainly consists of permanent magnets supported on the base to provide a magnetic field, and electrical ... -
Wave Characteristics of Two Dimensional Hierarchical Hexagonal Lattice Structures
(The American Society of Mechanical Engineers (ASME), 2014)Hierarchical structures are structures that themselves contain structural elements. Hierarchical lattice structures are counterparts of the traditional lattice structures, whose walls are replaced by some kind of structure. ... -
High Precision Positioning of Laser Beams for Vibration Measurements
(The American Society of Mechanical Engineers (ASME), 2014)Predicting the vibratory response of structures with complex geometry can be challenging especially when their properties (geometry and material properties) are not known accurately. These structures can suffer also from ... -
A Perturbation Solution of the Thickness Natural Vibrations of a Piezoelectric Plate
(The American Society of Mechanical Engineers (ASME), 2014)This paper discusses a perturbation approach to the calculation of the natural frequencies and mode shapes for both the displacement and the electrostatic potential throughthickness vibration of an infinite piezoelectric ... -
Modeling the Flexural Dynamic Behavior of Axially Moving Continua by Using the Finite Element Method
(The American Society of Mechanical Engineers (ASME), 2014)Mechanical systems including conveyor belts, band saw blades, and power transmission belts are influenced by the lateral motion of the moving structure. This phenomenon was studied in the literature both using the theory ...