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Mobility power flow analysis of connected thick plates with a step discontinuity
Title
Mobility power flow analysis of connected thick plates with a step discontinuity.
Creator
Faivre d'Arcier, Eric., Florida Atlantic University, Cuschieri, Joseph M.
Abstract/Description
In this thesis the flow of vibration power between two coupled, finite plates of arbitrary thicknesses is considered using a Mobility Power Flow (MPF) approach. The plate structure is divided into substructures and mobility functions are determined for the independent substructures. Power flow expressions are derived based on continuity of forces and displacements. The solution presented here considers the effects of both in-plane waves and out-of-plane waves. The solution is applicable to...
Show moreIn this thesis the flow of vibration power between two coupled, finite plates of arbitrary thicknesses is considered using a Mobility Power Flow (MPF) approach. The plate structure is divided into substructures and mobility functions are determined for the independent substructures. Power flow expressions are derived based on continuity of forces and displacements. The solution presented here considers the effects of both in-plane waves and out-of-plane waves. The solution is applicable to frequencies below the first mode of thickness-shear vibration. The results obtained show that at low frequencies, the out-of-plane waves dominate in the transmission of vibrational power. However, at high frequencies or for thick plates, the in-plane waves play a significant role in the power transmission through the plate.
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Date Issued
1991
PURL
http://purl.flvc.org/fcla/dt/14705
Subject Headings
Vibration--Measurement
Format
Document (PDF)
EXPERIMENTAL MODAL ANALYSIS OF A DISCMILL FIBERIZER DISC (VIBRATION, PLATES, RESONANCES)
Title
EXPERIMENTAL MODAL ANALYSIS OF A DISCMILL FIBERIZER DISC (VIBRATION, PLATES, RESONANCES).
Creator
FREEZE, WILLIAM PRESTON., Florida Atlantic University, Stevens, Karl K.
Abstract/Description
Modal analysis testing techniques were used to determine the modal parameters and mode shapes for flexural vibration of a Fiberizer Discmill disc to help define a safe operating speed range. The modal parameters and mode shapes were determined for the first six diametral modes, the first concentric mode, and the first rigid body shaft mode. The disc consisted of a circular aluminum plate with eight equally and symmetrically spaced radial cutters on one face of the disc and eight equally...
Show moreModal analysis testing techniques were used to determine the modal parameters and mode shapes for flexural vibration of a Fiberizer Discmill disc to help define a safe operating speed range. The modal parameters and mode shapes were determined for the first six diametral modes, the first concentric mode, and the first rigid body shaft mode. The disc consisted of a circular aluminum plate with eight equally and symmetrically spaced radial cutters on one face of the disc and eight equally spaced peripheral cutters located on the rim of the disc midway between the angular locations of the radial cutters. All cutters were of tool steel. The safe area of operation is determined to be between 3000 rpm and 3600 rpm. The experimental setup and procedure Is described in detail with particular emphasis on validation of assumptions required for the analytical approaches used in calculating the modal data.
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Date Issued
1986
PURL
http://purl.flvc.org/fcla/dt/14329
Subject Headings
Milling machinery, Vibration--Measurement
Format
Document (PDF)
INVESTIGATION OF ENERGY FLOW AND ACOUSTIC RADIATION OF FLUID-LOADED PANELS USING THE ENERGY ACCOUNTANCY CONCEPT
Title
AN INVESTIGATION OF ENERGY FLOW AND ACOUSTIC RADIATION OF FLUID-LOADED PANELS USING THE ENERGY ACCOUNTANCY CONCEPT.
Creator
MAILLET, PHILIPPE LOUIS., Florida Atlantic University, Dunn, Stanley E., Cuschieri, Joseph M., College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description
The energy flow and the acoustic radiation of fluid-loaded panels are investigated using the Energy Accountancy Concept. The various energy components of the systems are defined and studied. Each component is a function of the excitation, the structure, the medium and their coupling. An energy balance equation is written for the system. This method is applied to study the acoustic radiation from a point-excited clamped plate placed on the free surface of a water tank. The radiation efficiency...
Show moreThe energy flow and the acoustic radiation of fluid-loaded panels are investigated using the Energy Accountancy Concept. The various energy components of the systems are defined and studied. Each component is a function of the excitation, the structure, the medium and their coupling. An energy balance equation is written for the system. This method is applied to study the acoustic radiation from a point-excited clamped plate placed on the free surface of a water tank. The radiation efficiency of the plate is measured and compared to previous works. The energy balance equation gives very good results at frequencies between 50 Hz and 12 kHz. An undefined source of energy dissipation is observed in one experiment. The results of this study have shown that the Energy Accountancy Concept can be used to describe the energy flow in a vibrating structure under water-loading.
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Date Issued
1986
PURL
http://purl.flvc.org/fcla/dt/14289
Subject Headings
Acoustic radiation pressure, Vibration--Measurement
Format
Document (PDF)