John Gagliardi

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David Seamon

Kansas State University

Stephane Tonnelat

Centre National de la Recherche Scientifique / French National Centre for Scientific Research

Nor Haslina Jaafar

Universiti Kebangsaan Malaysia

Bulent Batuman

Bilkent University

Sarah M O H A M E D el hawary

De Montfort University

İlgi Toprak

Independent Researcher

Sara Hassan

University of Birmingham

Kumru Çılgın

Mimar Sinan Fine Arts University

Usama Konbr

Faculty of Engineering Tanta University

João Pedro Silva Nunes

Faculty of Human and Social Sciences - New University of Lisbon

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Papers by John Gagliardi

Feasibility of observer system for determining orientation of balloon borne observational platforms

Analytical Studies of Axially Symmetric Motion of an Incompressible Viscous Fluid Between Two Concentric Rotating Spheres

Study of the axially symmetric motion of an incompressible viscous fluid between two concentric rotating spheres

Journal of Engineering Mathematics, 1990

The research reported herein involves the study of the steady state and transient motion of a sys... more The research reported herein involves the study of the steady state and transient motion of a system consisting of an incompressible, Newtonian fluid in an annulus between two concentric, rotating, rigid spheres. The primary purpose of the research is to study the use of an approximate analytical method for analyzing the transient motion of the fluid in the annulus and the spheres which are started suddenly due to the action of prescribed torques. The problems include cases where: (a) one (or both) spheres rotate with prescribed constant angular velocities and (b) one sphere rotates due to the action of an applied constant or impulsive torque. In this research, the coupled solid and fluid equations of motion are linearized by employing the perturbation technique. The meridional dependence in these equations is removed by expanding the dependent variables in a series of Gegenbauer functions with variable coefficients and employing the orthogonality property of these functions. The equations for the variable coefficients are solved by separation of variables and Laplace transform methods. Results for the stream function, circumferential function, angular velocity of the spheres and torque coefficient are presented as a function of time for various values of the dimensionless system parameters.

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Numerical study of the axially symmetric motion of an incompressible viscous fluid in an annulus between two concentric rotating spheres

International Journal for Numerical Methods in Fluids, 1989

Abstract The research reported herein involved the study of the transient motion of a system cons... more

Adaptive filtering of sound pressure signals for monitoring machinery in noisy environments

Applied Acoustics, 1994

An experimental evaluation of the ability of sound pressure microphones to diagnose different mac... more An experimental evaluation of the ability of sound pressure microphones to diagnose different machinery conditions in noisy environments was per-Jormed. An adaptive filtering (ANC) routine was incorporated to reduce the noise. The detection process utilized frequency spectra of the data, along with cepstrum and kurtosis methods" of analysis. Two different machine components were monitored." ball bearings in a ball bearings test stand and milling bits in a milling machine. The effect of the placement of the microphones on the ANC routine to reduce the background noise in the signal was investigated and found to influence the results. The results show that the sound pressure microphones could not reliably diagnose ball bearing condition but could diagnose the milling machine bit condition.

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Feasibility of observer system for determining orientation of balloon borne observational platforms

Analytical Studies of Axially Symmetric Motion of an Incompressible Viscous Fluid Between Two Concentric Rotating Spheres

Study of the axially symmetric motion of an incompressible viscous fluid between two concentric rotating spheres

Journal of Engineering Mathematics, 1990

Download

Numerical study of the axially symmetric motion of an incompressible viscous fluid in an annulus between two concentric rotating spheres

International Journal for Numerical Methods in Fluids, 1989

Abstract The research reported herein involved the study of the transient motion of a system cons... more

Adaptive filtering of sound pressure signals for monitoring machinery in noisy environments

Applied Acoustics, 1994

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John Gagliardi

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