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Tuesday, July 21, 2020 | History

4 edition of Modal ring method for the scattering of sound found in the catalog.

Modal ring method for the scattering of sound

Kenneth J. Baumeister

Modal ring method for the scattering of sound

by Kenneth J. Baumeister

  • 328 Want to read
  • 35 Currently reading

Published by National Aeronautics and Space Administration, Lewis Research Center, For sale by the National Technical Information Service in [Cleveland, Ohio], [Springfield, Va .
Written in English

    Subjects:
  • Echo scattering layers,
  • Computational grids (Computer systems),
  • Eigenvectors,
  • Rings (Algebra)

  • Edition Notes

    StatementKenneth J. Baumeister and Kevin L. Kreider.
    SeriesNASA technical memorandum -- 106342.
    ContributionsKreider, Kevin L., Lewis Research Center., American Society of Mechanical Engineers. Winter Meeting.
    The Physical Object
    FormatMicroform
    Pagination8 p.
    ID Numbers
    Open LibraryOL17634763M
    OCLC/WorldCa51634377

    this thesis. It introduces a method to compute modal functions of general scatterers based on the BEM and the singular value decomposition (SVD). The method is similar to other methods of literature but it di ers in that the scattering problem is regarded more closely in contrast to the radiation : Fabio Kaiser. The FRF database for modal analysis should be as accurate as possible. One of the elements is an omnidirectional sound source. This allows an accurate real-time, sound-source strength measure-ment. Figure 2 clearly shows that the emitted sound pressure does not vary more than dB at Hz. A comparison of acoustic.

    The sound radiating due to a plane piston located at one end of a finite, rigid, open, cylindrical duct was investigated by Ingard [3]. The problem was solved by considering the effects on the acoustic pressure field at the open end of the duct. Higher order modes were included in the analysis. The radiation impedance and pressure distribution. Pioneering development of acoustic resonance scattering theory. Channeling in under-ocean sound propagation. Elastic waves: First development of theory of resonance scattering by cavities and inclusions in solids. Electromagnetic waves: Establishment of the relation between resonance scattering theory and the Singularity Expansion Method (SEM).

    @article{osti_, title = {Experimental Modal Analysis on a Rotating Fan Using Tracking-CSLDV}, author = {Gasparoni, Andrea and Castellini, Paolo and Tomasini, Enrico P and Allen, Matthew S and Shifei, Yang and Sracic, Michael W}, abstractNote = {Continuous Scan Laser Doppler Vibrometry (CSLDV) modifies the traditional mode of operation of a vibrometer by sweeping the laser . Contributed by the Technical Committee on Vibration and Sound of ASME for publication in the J OURNAL OF V IBRATION AND A ript received Decem ; final manuscript received Novem ; published online Janu Author: H. S. Chen, T. Y. Li, X. Zhu, J. Yang, J. J. Zhang.


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Modal ring method for the scattering of sound by Kenneth J. Baumeister Download PDF EPUB FB2

Get this from a library. Modal ring method for the scattering of sound. [Kenneth J Baumeister; Kevin L Kreider; Lewis Research Center.; American Society of Mechanical Engineers.

Winter Annual Meeting.]. The modal element method for acoustic scattering can be simplified when the scattering body is rigid. In this simplified method, called the modal ring method, the scattering body is represented by a ring of triangular finite elements forming the outer surface.

The acoustic pressure is calculated at the element nodes. The pressure. Scattering Cross Section of Sound Waves by the Modal Element Method (NASA-TM-I) SCATTERING CROSS SECTION OF SOUND WAVES BY THE MODAL ELEMENT METHOD (NASA.

Lewis Research Center) 7 p N Unclas Kenneth J. Baumeister Lewis Research Center Cleveland, Ohio G3/7i and Kevin L. Kreider The University of Akron Akron, Ohio Prepared. Also, for hard bodies, a compact modal ring grid system is introduced for which computing requirements are drastically reduced.

In this paper, analysis for two-dimensional scattering from solid and coated (acoustically treated) bodies is presented, and several simple numerical examples are by: 2. The Scattering of Light and other Electromagnetic Radiation covers the theory of electromagnetic scattering and its practical applications to light scattering.

This book is divided into 10 chapters that particularly present examples of practical applications to light scattering from colloidal and macromolecular systems.

In this simplified method, called the modal ring method, the scattering body is represented by a ring of triangular finite elements forming the outer surface. The acoustic pressure is calculated. Application of the Multi-Modal Integral Method (MMIM) to Sound Wave Scattering in an Acoustic Waveguide.

Alexei Zinoviev The Department of Mechanical Engineering, The University of Adelaide. 5 of 2 Abstract. The current work is devoted to the problem of sound wave scattering by elastic cylindrical objects in a plain acoustic waveguide.

The scattering matrix is determined with the multiple source (or mu ltiple excitation) method described in Ref. [12] corresponding to the two-source method for the plane wave range [13–15].

This. Method of partial waves For scattering from a central potential, the scattering amplitude, f, must be symmetrical about axis of incidence. In this case, both scattering wavefunction, ψ(r), and scattering amplitudes, f (θ), can be expanded in Legendre polynomials, ψ(r)=-∞ $=0 R $(r)P $(cos θ) cf.

wavefunction for hydrogen-like atoms with m File Size: 1MB. Home > NDT > Resonant Acoustic Method: Resonant Acoustic Method Resonance Inspection Delivers % Quality Inspected Parts. In the world of manufacturing today, the potential liability of shipping a defective part is catastrophic to you, your customer and the consumer.

A modal theory is developed for investigating the acoustic scattering by elastic cylinders of arbitrary cross section immersed in a fluid. Numerical results are presented for a plane wave incidence normal to the axis of an elliptical cylinder but arbitrary with respect to the noncircular cross section.

Experimental results are obtained for an aluminum elliptical cylinder with the use of an Cited by: Scattering theory is the study of an interacting system on a scale of time and/or distance which is large compared to the scale of the interaction itself.

As such, it is the most effective means, sometimes the only means, to study microscopic nature. To understand the importance of scattering theory, consider the variety of ways in which it arises.3/5(1).

This is a Wikipedia book, a collection of Wikipedia articles that can be easily saved, imported by an external electronic rendering service, and ordered as a printed book. Edit this book: Book Creator. The inverse scattering problem is central to many areas of science and technology such as radar and sonar, medical imaging, geophysical exploration and nondestructive testing.

This book is devoted to the mathematical and numerical analysis of the inverse scattering problem for Cited by: Scattering Theory 4. The scattering potential V(~r1;~r2)=V(j~r1 ¡~r2j) between the incident particle and the scattering center is a central potential, so we can work in the relative coordinate and reduced mass of the system.

Under these conditions, the picture of interest reduces to that depicted below,File Size: KB. SOUND AND VIBRATION/JANUARY 1 Often times, people ask some simple questions regarding modal analysis and how structures vibrate. Most times, it is impossible to describe this simply and some of the basic un-derlying theory needs to be addressed in order to fully explain some of these concepts.

However, many times the theory is just. complicates the computation of modal scaling which is frequently required in model validation.

As an example, both microphone measurements and accelerometer measurements are utilized in an impact test for a heavy ring-disc structure.

The results from each method are compared to study the effectiveness of estimating modal. Inverse Acoustic and Electromagnetic Scattering Theory DAVID COLTON Abstract.

This paper is a survey of the inverse scattering problem for time-harmonic acoustic and electromagnetic waves at ˝xed frequency. We begin by a discussion of weak scattering and Newton-type methods for solving the inverse scattering problem for acoustic waves.

Circular array of piezoelectric transducers, with the internal diameter of mm is the main element of the multi-modal ultrasound computerized tomography eramic transceiver transducers (in the shape of narrow pillars), which are evenly distributed on the inner side of the array attachment ring, are stimulated when transmitting by short rectangular pulses with a length of Cited by:   This article will help you understand Acoustical Scattering.

As we all know, sound propagates as a wave. But under certain conditions, we can simplify our analyses by pretending that it moves as particles or rays. A wave has no specific position, whereas a particle does. A ray is the (assumed) linear path of a particle.

Journal of Sound and Vibration () 87(4), ON THE SCATTERING OF SOUND BY A VORTEX RING M. S. HOWE Faculty of Mathematical Studies, University of Southampton, Southampton S09 5NH, England (Received 5 May ) An analytical treatment is given of the scattering of sound by a circular vortex ring translating at low Mach number in an unbounded stationary by:   The boundary-element method (BEM) has certain advantages as a scattering model for various shapes of marine animals.

First, the boundary conditions can be treated on curved surfaces and, second, acoustic problems, such as scattering amplitudes, can be analysed in the infinite domain because the acoustic field is used only on the target surface Cited by: 7.Due to specific acoustic modal analysis challenges, such as the high modal damping ratios and the need to use a large number of sound sources spread around the cabin to get a sufficient excitation of the modes, the modal parameter estimation is often a non-trivial by: 8.