Journal of Vibration and Acoustics: Recent submissions
Now showing items 2141-2160 of 3913
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Three-Dimensional CFD Rotordynamic Analysis of Gas Labyrinth Seals
(The American Society of Mechanical Engineers (ASME), 2003)Labyrinth seals are utilized inside turbomachinery to provide noncontacting control of internal leakage. These seals can also play an important role in determining the rotordynamic stability of ... -
The Scientific Work of Jørgen Lund and a Personal Assessment of Its Significance
(The American Society of Mechanical Engineers (ASME), 2003)A selection of the more important works of Jørgen Lund are described. The industrial features of the periods in which specific developments in rotordynamics took place are discussed, together ... -
Application of Lund’s Stability Analysis Program in Design of Modern Turbomachinery
(The American Society of Mechanical Engineers (ASME), 2003)The analytical tool developed by Lund has aided in the design and manufacture of modern turbomachinery operating at relatively high speeds, under severe operating conditions, with high gas ... -
Lund’s Elliptic Orbit Forced Response Analysis: The Keystone of Modern Rotating Machinery Analysis
(The American Society of Mechanical Engineers (ASME), 2003)A total understanding of rotating machinery vibration analysis requires evaluation of critical speed placement, forced response sensitivity to imbalance, linear onset of instability prediction and ... -
The Multiple Contributions of Jørgen Lund’s Ph.D. Dissertation, Self-Excited, Stationary Whirl Orbits of a Journal in Sleeve Bearings, RPI, 1966, Engineering Mechanics
(The American Society of Mechanical Engineers (ASME), 2003)Lund set out to define the circumstances under which stable limit-cycle orbits could exist for the linearly unstable motion of a rigid rotor. He also examined the nature of these stable limit ... -
Some Unusual Cases of Rotor Instability
(The American Society of Mechanical Engineers (ASME), 2003)In the paper presented here three peculiar cases of rotor instability are presented. The first is a tilting-pad bearing used as an intershaft bearing in a two-spool gas turbine. It was initially ... -
Lund’s Contribution to Rotor Stability: The Indispensable and Fundamental Basis of Modern Compressor Design
(The American Society of Mechanical Engineers (ASME), 2003)In the early design of compressors and turbines, it was of importance to locate the rotor critical speeds so as to insure that a turbo rotor would not be operating at a critical speed. As ... -
Instability Boundary for Rotor-Hydrodynamic Bearing Systems, Part 2: Rotor With External Flexible Damped Support
(The American Society of Mechanical Engineers (ASME), 2003)A rotor-hydrodynamic bearing system having external flexible damped bearing supports is more complicated than that discussed in Part 1 but it can provide a means to improve the stability of ... -
Special Issue: The Contributions of Jørgen W. Lund to Rotor Dynamics
(The American Society of Mechanical Engineers (ASME), 2003)Grahic Jump Location -
Instability Boundary for Rotor-Hydrodynamic Bearing Systems, Part 1: Jeffcott Rotor With External Damping
(The American Society of Mechanical Engineers (ASME), 2003)The instability of rotor-hydrodynamic bearing systems has been a major concern in high-speed rotating machine design. The threshold speed is usually considered to be a barrier that cannot be ... -
Directionally Controllable Squeeze Film Damper Using Electro-Rheological Fluid
(The American Society of Mechanical Engineers (ASME), 2002)Electro-Rheological (ER) fluid is a class of functional fluid whose yield stress can be changed by an electric field applied to the fluid, which is observed as a variation of apparent viscosity. ... -
Editorial
(The American Society of Mechanical Engineers (ASME), 2002)This issue marks the beginning of my third year as editor of JVA. The associate editors, journal secretary and I continue to strive to improve the performance of the Journal, with mean time ... -
Embedded Self-Sensing Piezoelectric Active Sensors for On-Line Structural Identification
(The American Society of Mechanical Engineers (ASME), 2002)The benefits and limitations of using embedded piezoelectric active sensors for structural identification at ultrasonic frequency are highlighted. An analytical model based on structural vibration ... -
Parametric Optimization of Structures Under Combined Base Motion Direct Forces and Static Loading
(The American Society of Mechanical Engineers (ASME), 2002)This paper deals with the optimization of vibrating structures as a mean for minimizing unwanted vibration. Presented in this work is a method for automatic determination of a set of preselected ... -
Variable Resistance Type Energy Regenerative Damper Using Pulse Width Modulated Step-up Chopper
(The American Society of Mechanical Engineers (ASME), 2002)This paper describes a new technique for improving the damping property and efficiency of an energy regenerative damper. It is intended for a linear DC motor type vibration damper to regenerate ... -
Varying the Stiffness of a Beam-Like Neutralizer Under Fuzzy Logic Control
(The American Society of Mechanical Engineers (ASME), 2002)Vibration neutralizers are effective vibration control devices at a single frequency. If they can compensate for drift in the excitation frequency by adjusting their stiffness the performance can ... -
An Exact Approach For Free Vibration Analysis of Multi-Step Nonuniform Shear Plates
(The American Society of Mechanical Engineers (ASME), 2002)In this paper multi-story frame buildings are treated as shear plates with variably distributed mass and stiffness for free vibration analysis. An analytical model of a shear plate is proposed ... -
Multiple Stability and Unpredictable Outcomes in the Chaotic Vibrations of Euler Beams
(The American Society of Mechanical Engineers (ASME), 2002)Nonlinear phenomena in the vibration of a slender, Euler-Bernoulli beam in compression and under periodic transverse loading is investigated. A feature of this system is the coexistence of ... -
Active Noise Hybrid Feedforward/Feedback Control Using Neural Network Compensation*
(The American Society of Mechanical Engineers (ASME), 2002)The nonlinear active noise control (ANC) is studied. The nonlinear ANC system is approximated by an equivalent model composed of a simple linear sub-model plus a nonlinear sub-model. Feedforward ... -
Virtual Skyhook Vibration Isolation System
(The American Society of Mechanical Engineers (ASME), 2002)This work presents and demonstrates a passive isolation system that offers the performance of a skyhook damper, but without the need of an inertial reference. This “virtual skyhook” isolation ...