Journal of Vibration and Acoustics: Recent submissions
Now showing items 2541-2560 of 3913
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An Instability Analysis Procedure for Three-Level Multi-Bearing Rotor-Foundation Systems
(The American Society of Mechanical Engineers (ASME), 1998)A procedure for the instability analysis of three-level multi-span rotor systems is described. This procedure is based on a distributed mass-elastic representation of the rotor system in several ... -
Noise Propagation Through Helicopter Gearbox Support Struts—An Experimental Study
(The American Society of Mechanical Engineers (ASME), 1998)A dominant source of noise in a helicopter cabin is the meshing of the gears in the main rotor gearbox. The main structural noise transmission path from this gearbox to the cabin is through ... -
Required Precision and Valid Methodologies for Dynamic Finite Element Model Updating
(The American Society of Mechanical Engineers (ASME), 1998)This paper investigates the effects of adjusting the system matrices of a Finite Element (FE) model on the eigen-properties of the model for the purposes of dynamic model updating. It is shown ... -
Vibration of a Cracked Cantilever Beam
(The American Society of Mechanical Engineers (ASME), 1998)A continuous cracked bar vibration model is developed for the lateral vibration of a cracked Euler-Bernoulli cantilevered beam with an edge crack. The Hu-Washizu-Barr variational formulation was ... -
The Innovations Approach to Experimental Modeling of Flexible Structures
(The American Society of Mechanical Engineers (ASME), 1998)A technique based on the innovations approach to linear least square identification is proposed for experimental state space modeling of flexible structures. Upon the selection of the model ... -
ARMAV Techniques for Traffic Excited Bridges
(The American Society of Mechanical Engineers (ASME), 1998)In this paper ARMAV (Auto Regressive Moving Average Vector) models are used for system identification and modal analysis purposes. This time domain technique allows to estimate a discrete time ... -
Identification of the Dynamic Characteristics of Long Annular Seals Using a Time Domain Technique
(The American Society of Mechanical Engineers (ASME), 1998)This paper describes experimental results from a research program aimed at a study of the static and dynamic characteristics of liquid long annular seals. A seal test rig permits the identification ... -
An Active Control Design for a Class of Parametrically Excited Systems Based on the Gradient Algorithm
(The American Society of Mechanical Engineers (ASME), 1998)This paper introduces a new control design for a dynamic system subject to stationary or nonstationary parametric excitations. In this new design, the system dynamics is transformed into one ... -
Use of dFRFs for Identification of Travelling Wave Modes in Rotating Disks
(The American Society of Mechanical Engineers (ASME), 1998)Use of the wave directional frequency response function (dFRF), which is composed of conventional frequency response functions, is proposed for identification of the forward and backward travelling ... -
A Comparison of Conventional and Impedance Methods for Modeling Piezoelectric Materials Actuation in Smart Structures
(The American Society of Mechanical Engineers (ASME), 1998)In this paper two distinct methods, an impedance method and a “conventional” method, for modeling the dynamic interaction between the piezoelectric actuators/sensors and the substructures are ... -
Transducer Placement for Broadband Active Vibration Control Using a Novel Multidimensional QR Factorization
(The American Society of Mechanical Engineers (ASME), 1998)This paper advances the state of the art in the selection of minimal configurations of sensors and actuators for active vibration control with smart structures. The method extends previous ... -
Measurement of Sound Intensity in Comparison With Simulations Using Finite and Semi-infinite Helmholtz Elements
(The American Society of Mechanical Engineers (ASME), 1998)This paper is concerned with the generation and application of semi-infinite Helmholtz elements in accordance with the decay function periodic infinite elements proposed by Bettess (1992). In ... -
The Prediction of Substructure and System Modes by the Extended Complex Mode Indication Function
(The American Society of Mechanical Engineers (ASME), 1998)Yee and Tsuei (1989) developed the Modal Force Technique (MFT) as a tool for component synthesis. The approach utilizes the frequency response functions at connecting joints to predict the ... -
Steady State Response Prediction of General Linear Structures Coupled by Local Nonlinear Elements
(The American Society of Mechanical Engineers (ASME), 1998)This short paper is concerned with a direct application of the techniques developed by the authors in two previous publications. It is considered as a “booster” to the existing alternating ... -
Transient Behavior of a Springless Flapper Valve: Closing Motion
(The American Society of Mechanical Engineers (ASME), 1998)The closing of a springless flapper valve was investigated in order to gain a better understanding of the transient behavior of the valve. An experimental investigation included simultaneous ... -
Exact Modeling of the Spatial Rigid Body Inertia Using the Finite Element Method
(The American Society of Mechanical Engineers (ASME), 1998)In the classical finite element literature beams and plates are not considered as isoparametric elements since infinitesimal rotations are used as nodal coordinates. As a consequence, exact ... -
Vector Triggering Random Decrement for High Identification Accuracy
(The American Society of Mechanical Engineers (ASME), 1998)Using the Random Decrement (RD) technique to obtain free response estimates and combining this with time domain modal identification methods to obtain the poles and the mode shapes is acknowledged ... -
Boundary Element Prediction of Sound Propagation in Ducts Containing Bulk Absorbing Materials
(The American Society of Mechanical Engineers (ASME), 1998)In this paper the sound propagation in a rectangular duct containing a bulk absorbing foam liner is investigated. The foam is characterized by the complex characteristic impedance and propagation ... -
Modelling of a Flexible Slewing Link
(The American Society of Mechanical Engineers (ASME), 1998)A flexible rotating beam is modelled using Timoshenko beam theory and a non-inertial reference frame that leads to a pseudo-pinned-pinned formulation. The frequency equation and orthogonality ... -
Dissipative Feedback Control of a Reverberant Enclosure Using a Constant Volume Velocity Source
(The American Society of Mechanical Engineers (ASME), 1998)Loudspeakers are commonly used as actuators in active noise control applications. In this work, a loudspeaker is compensated so that it approximates a constant volume velocity source over the ...