Author: V. A. Del Grosso
Publisher:
ISBN:
Category :
Languages : en
Pages : 132
Book Description
It was shown in Part 1 (AD-437 995) of this series of reports that appreciable errors in sound speed and sound absorption determinations may be attributed to a neglect in applying appropriate corrections to those situations closely approximating free-field conditions (finite size, plane-parallel source). In the present report it is shown that appreciable errors in the measurement of sound speed and sound absorption for guided mode propagation may be attributed to neglect in applying corrections that may be required because of the selection of geometric parameters or the method of measurement. This report contains graphs of pressure and phase, relative to planewave values and averaged over a plane-parallel receiver of size equal to the source size, for acoustic energy propagation down a right-circular liquid cylinder with lateral boundary condition appropriate to one of the following: absolutely rigid walls, infinitely flexible walls, liquid walls, or elastic solid walls. The latter boundary condition, which is considered to be that more appropriate to the situation of a liquid contained within a thick-walled metal tube, is shown to result in maximum anomalies in sound speed determinations when the transducer completely closes one end of the tube. (Author).
Systematic Errors in Ultrasonic Propagation Parameter Measurements. Part 2. Effects of Guided Cylindrical Modes
Author: V. A. Del Grosso
Publisher:
ISBN:
Category :
Languages : en
Pages : 132
Book Description
It was shown in Part 1 (AD-437 995) of this series of reports that appreciable errors in sound speed and sound absorption determinations may be attributed to a neglect in applying appropriate corrections to those situations closely approximating free-field conditions (finite size, plane-parallel source). In the present report it is shown that appreciable errors in the measurement of sound speed and sound absorption for guided mode propagation may be attributed to neglect in applying corrections that may be required because of the selection of geometric parameters or the method of measurement. This report contains graphs of pressure and phase, relative to planewave values and averaged over a plane-parallel receiver of size equal to the source size, for acoustic energy propagation down a right-circular liquid cylinder with lateral boundary condition appropriate to one of the following: absolutely rigid walls, infinitely flexible walls, liquid walls, or elastic solid walls. The latter boundary condition, which is considered to be that more appropriate to the situation of a liquid contained within a thick-walled metal tube, is shown to result in maximum anomalies in sound speed determinations when the transducer completely closes one end of the tube. (Author).
Publisher:
ISBN:
Category :
Languages : en
Pages : 132
Book Description
It was shown in Part 1 (AD-437 995) of this series of reports that appreciable errors in sound speed and sound absorption determinations may be attributed to a neglect in applying appropriate corrections to those situations closely approximating free-field conditions (finite size, plane-parallel source). In the present report it is shown that appreciable errors in the measurement of sound speed and sound absorption for guided mode propagation may be attributed to neglect in applying corrections that may be required because of the selection of geometric parameters or the method of measurement. This report contains graphs of pressure and phase, relative to planewave values and averaged over a plane-parallel receiver of size equal to the source size, for acoustic energy propagation down a right-circular liquid cylinder with lateral boundary condition appropriate to one of the following: absolutely rigid walls, infinitely flexible walls, liquid walls, or elastic solid walls. The latter boundary condition, which is considered to be that more appropriate to the situation of a liquid contained within a thick-walled metal tube, is shown to result in maximum anomalies in sound speed determinations when the transducer completely closes one end of the tube. (Author).
NRL Report
Author:
Publisher:
ISBN:
Category : Naval research
Languages : en
Pages : 140
Book Description
Publisher:
ISBN:
Category : Naval research
Languages : en
Pages : 140
Book Description
Systematic Errors in Ultrasonic Propagation Parameter Measurements. Part 4-effect of Finite Thickness Elastic Solid Tubes Enclosing the Liquid Cylinder of Interest
Author: Vincent A. Del Grosso
Publisher:
ISBN:
Category :
Languages : en
Pages : 144
Book Description
The exact formulation of the characteristic or frequency equation for an inviscid liquid cylinder radially enclosed within a finite impedance elastic solid of finite wall thickness is solved for the permissible modes, including degenerations to the surrounding medium being of infinite extent and either an elastic solid or another liquid, as well as to the limiting cases of infinite impedance (rigid boundary) and zero impedance (free boundary). These modes are utilized to expand both the potential within the otherwise unterminated cylinder and the source impedance variation with position of an opposing termination. A piston source of appreciable ka (=100 pi) is found to render further source specification indifferent as to uniform pressure or uniform velocity, and a large radial impedance mismatch (=28) is found to permit a simplifying orthogonality assumption. With the inviscid assumption, the formulation indicates that a judicious selection of experimental configuration can limit diffraction propagation uncertainties to a few parts per million. An incidental result is the demonstration that the zero elastic tube mode exists at all frequencies rather than displaying an upper cutoff frequency as was recently reported. (Author).
Publisher:
ISBN:
Category :
Languages : en
Pages : 144
Book Description
The exact formulation of the characteristic or frequency equation for an inviscid liquid cylinder radially enclosed within a finite impedance elastic solid of finite wall thickness is solved for the permissible modes, including degenerations to the surrounding medium being of infinite extent and either an elastic solid or another liquid, as well as to the limiting cases of infinite impedance (rigid boundary) and zero impedance (free boundary). These modes are utilized to expand both the potential within the otherwise unterminated cylinder and the source impedance variation with position of an opposing termination. A piston source of appreciable ka (=100 pi) is found to render further source specification indifferent as to uniform pressure or uniform velocity, and a large radial impedance mismatch (=28) is found to permit a simplifying orthogonality assumption. With the inviscid assumption, the formulation indicates that a judicious selection of experimental configuration can limit diffraction propagation uncertainties to a few parts per million. An incidental result is the demonstration that the zero elastic tube mode exists at all frequencies rather than displaying an upper cutoff frequency as was recently reported. (Author).
Scientific and Technical Aerospace Reports
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1278
Book Description
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1278
Book Description
Technical Abstract Bulletin
Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 684
Book Description
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 684
Book Description
Heat Capacities
Author: Emmerich Wilhelm
Publisher: Royal Society of Chemistry
ISBN: 0854041761
Category : Science
Languages : en
Pages : 531
Book Description
The book contains the very latest information on all aspects of heat capacities related to liquids and vapours, either pure or mixed. The chapters, all written by knowledgeable experts in their respective fields, cover theory, experimental methods, and techniques (including speed of sound, photothermal techniques, brillouin scattering, scanning transitiometry, high resolution adiabatic scanning calorimetry), results on solutions, liquids, vapours, mixtures, electrolytes, critical regions, proteins, liquid crystals, polymers, reactions, effects of high pressure and phase changes. Experimental methods for the determination of heat capacities as well as theoretical aspects, including data correlation and prediction, are dealt with in detail. Of special importance are the contributions concerning heat capacities of dilute solutions, ultrasonics and hypersonics, critical behavior and the influence of high pressure.
Publisher: Royal Society of Chemistry
ISBN: 0854041761
Category : Science
Languages : en
Pages : 531
Book Description
The book contains the very latest information on all aspects of heat capacities related to liquids and vapours, either pure or mixed. The chapters, all written by knowledgeable experts in their respective fields, cover theory, experimental methods, and techniques (including speed of sound, photothermal techniques, brillouin scattering, scanning transitiometry, high resolution adiabatic scanning calorimetry), results on solutions, liquids, vapours, mixtures, electrolytes, critical regions, proteins, liquid crystals, polymers, reactions, effects of high pressure and phase changes. Experimental methods for the determination of heat capacities as well as theoretical aspects, including data correlation and prediction, are dealt with in detail. Of special importance are the contributions concerning heat capacities of dilute solutions, ultrasonics and hypersonics, critical behavior and the influence of high pressure.
Report of NRL Progress
Author: Naval Research Laboratory (U.S.)
Publisher:
ISBN:
Category : Naval research
Languages : en
Pages : 380
Book Description
Publisher:
ISBN:
Category : Naval research
Languages : en
Pages : 380
Book Description
Government-wide Index to Federal Research & Development Reports
Author:
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 760
Book Description
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 760
Book Description
U. S. Government Research and Development Reports
Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 1776
Book Description
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 1776
Book Description
Undergraduate Research Reports
Author: Cornell University. College of Engineering
Publisher:
ISBN:
Category : Engineering
Languages : en
Pages : 564
Book Description
Publisher:
ISBN:
Category : Engineering
Languages : en
Pages : 564
Book Description