Journal of Vibration and Acoustics: Recent submissions
Now showing items 3261-3280 of 3913
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Design Optimization of Response Amplitudes in Viscously Damped Structures
(The American Society of Mechanical Engineers (ASME), 1990)An optimization technique is presented which reduces the response of damped linear systems without neglecting the cost of the required design changes. A two-part function represents the design ... -
Time Domain Method for Parameter System Identification
(The American Society of Mechanical Engineers (ASME), 1990)In this paper a method of parameter identification for a multi-degree-of-freedom structural system in a noisy environment is presented. The method involves an iterative procedure in which initial ... -
Power Flow and Mechanical Intensity Calculations in Structural Finite Element Analysis
(The American Society of Mechanical Engineers (ASME), 1990)The identification of power flow paths in dynamically loaded structures is an important, but currently unavailable, capability for the finite element analyst. For this reason, methods for calculating ... -
Nonlinear Forced Oscillations Caused by Quartic Nonlinearity in a Rotating Shaft System
(The American Society of Mechanical Engineers (ASME), 1990)This paper deals with nonlinear forced oscillations in a rotating shaft system which are caused by quartic nonlinearity in a restoring force. These oscillations are theoretically analyzed by ... -
An Innovative Method of Investigating the Role of Turbulence in the Velocity Coupling Phenomenon
(The American Society of Mechanical Engineers (ASME), 1990)An investigation has been conducted of the velocity coupling phenomenon reported in acoustically unstable solid propellant rocket motors. An innovative simulation facility has been built using ... -
Boundary Element Methods in Probabilistic Acoustic Radiation Problems
(The American Society of Mechanical Engineers (ASME), 1990)Boundary Element Methods (BEM) are suited to a wide range of engineering problems, especially those of a semi-infinite nature. Examples of such problems can be found in the fluid-structure ... -
Lateral Excitation of a Rotating Shaft Driven by a Universal Joint With Friction
(The American Society of Mechanical Engineers (ASME), 1990)The relative angular motion between a cross-pin and yokes of a universal joint gives rise to viscous and Coulomb’s frictions. A driven rotating shaft resultingly undergoes a moment caused by ... -
Accurate Backbone Curves for a Modified-Duffing Equation for Vibrations of Imperfect Structures With Viscous Damping
(The American Society of Mechanical Engineers (ASME), 1990)This paper deals with the Runge-Kutta numerical solution of the modified-Duffing ordinary differential equation with viscous damping. Accurate backbone curves for the finite-amplitude vibrations of ... -
Vibration Characteristics of a Beam With Support Accompanying Clearance
(The American Society of Mechanical Engineers (ASME), 1990)Experimental and analytical investigations were conducted to identify the frequency response characteristics of a beam system with a minute clearance at the support. A beam in the shape of the ... -
Acoustic Characteristics of an Expansion Chamber With Constant Mass Flow and Steady Temperature Gradient (Theory and Numerical Simulation)
(The American Society of Mechanical Engineers (ASME), 1990)The governing equation of acoustic wave propagation in a circular expansion chamber with mean flow and temperature gradient is solved. The circular chamber is divided into N segments and the ... -
Experimental Investigations of Rotor Whirl Excitation Forces Induced by Labyrinth Seal Flow
(The American Society of Mechanical Engineers (ASME), 1990)The labyrinth seal flow-induced forces have been identified as one of the causes of rotordynamic instabilities in the recent literature. The eccentricity of the rotor center relative to the ... -
Extensions of the Modal Assurance Criterion
(The American Society of Mechanical Engineers (ASME), 1990)The modal assurance criterion (MAC) in general measures the degree of proportion between two (modal) vectors, in the form of a correlation coefficient of a least squares ratio estimate. The ... -
Modeling the Wavevector-Frequency Spectrum of Boundary-Layer Wall Pressure During Transition on a Flat Plate
(The American Society of Mechanical Engineers (ASME), 1990)A spectral model for the wall-pressure fluctuations induced on a zero pressure gradient, flat, rigid surface by a transitioning boundary layer at low Mach number is developed in this paper. ... -
Theoretical and Experimental Studies on Squeeze Film Stabilizers for Flexible Rotor-Bearing Systems Using Newtonian and Viscoelastic Lubricants
(The American Society of Mechanical Engineers (ASME), 1990)A combination of a squeeze film damper and a plane journal bearing is studied as a stabilizing scheme. The damper is made to play the role of a stabilizer to postpone the instability threshold ... -
Experimental Evaluation of Wide Band Active Vibration Controllers
(The American Society of Mechanical Engineers (ASME), 1990)Two methods for estimating unknown forces applied to a structure are incorporated into a design technique for wide-band vibration controllers. Their practical performances are compared by experiments ... -
Application of Learning Control to Active Damping of Forced Vibration for Periodically Time Variant Systems
(The American Society of Mechanical Engineers (ASME), 1990)This paper deals with discrete time learning controllers for systems with periodically varying parameters. Several control rules are proposed which use a basic principle of learning control that ... -
State Space Representation of the Nonself-Adjoint Acoustic Duct System
(The American Society of Mechanical Engineers (ASME), 1990)One-dimensional acoustic response of ducts is a classical engineering problem. The acoustic response in a hard-walled duct with a dissipative end condition can be visualized as a combination of ... -
Eigen-Analysis of a Tip-Loaded Beam Attached to a Rotating Joint
(The American Society of Mechanical Engineers (ASME), 1990)In this paper, a method of eigen-analysis for a vibrating elastic system is presented. The model analyzed is a Bernoulli-Euler beam having a slender payload at the free end and being attached ... -
Prediction of Periodic Response of Flexible Mechanical Systems With Nonlinear Characteristics
(The American Society of Mechanical Engineers (ASME), 1990)A numerical-analytical method for the prediction of steady state periodic response of large order nonlinear rotordynamic systems is addressed. Using this method, the set of nonlinear differential ... -
An Electroviscous Damper for Rotor Applications
(The American Society of Mechanical Engineers (ASME), 1990)A new type of vibration damper for rotor systems has been developed and tested. The damper contains electroviscous fluid which solidifies and provides Coulomb-type friction damping when an ...