Last edited by Shakashura

Saturday, July 18, 2020 | History

3 edition of **Acoustic scattering by three-dimensional stators and rotors using the SOURCE3D code** found in the catalog.

Acoustic scattering by three-dimensional stators and rotors using the SOURCE3D code

- 261 Want to read
- 7 Currently reading

Published
**1999**
by National Aeronautics and Space Administration, Glenn Research Center, Available from National Technical Information in [Cleveland, Ohio], Springfield, Va
.

Written in English

- Acoustic scattering.,
- Aerodynamic noise.,
- Noise prediction.,
- Turbofans.,
- Turbofan engines.,
- Rotor blades (Turbomachinery),
- Stator blades.,
- Cascade flow.

**Edition Notes**

Other titles | Acoustic scattering by three dimensional stators and rotors using the SOURCE3D code |

Statement | Harold D. Meyer. |

Series | [NASA contractor report] -- NASA/CR-1999-208885, NASA contractor report -- NASA CR-208885. |

Contributions | NASA Glenn Research Center. |

The Physical Object | |
---|---|

Format | Microform |

Pagination | v. |

ID Numbers | |

Open Library | OL17136112M |

springer, 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 acoustic and electromagnetic waves. In this third edition, new sections have been added on the linear. New Formulation of Acoustic Scattering P. Uorporalbm, Bed. ford, Mas.•'achltsells Upon introducing the outgoing spherical (or circular cylindeo partial wares {½n} as a hasis, the equatinn aT- - Re (Q) is obtained for the transition matrix 1' describing scattering for general incidence on a smnoth objec• of arbitrary shape.

This banner text can have markup.. web; books; video; audio; software; images; Toggle navigation. DOI: / Corpus ID: Inverse Acoustic and Electromagnetic Scattering Theory @inproceedings{ColtonInverseAA, title={Inverse Acoustic and Electromagnetic Scattering Theory}, author={David Colton and Rainer Kress}, year={} }.

Abstract: This paper presents a study of acoustic scattering by a cylinder of either infinite or finite length near a flat pressure-release surface. A novel self-consistent method is developed to describe the multiple scattering interactions between the cylinder and the surface. The complete scattering amplitude for the cylinder is derived from a set of equations, and is numerically evaluated. This book is our attempt to write such a monograph. The inverse scattering problem for acoustic and electromagnetic waves can broadly be divided into two classes, the inverse obstacle problem and the inverse the inverseobstacle problem,the scattering object is a homoge-.

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This report presents a study of rotor and stator scattering using the SOURCE3D Rotor Wake/Stator Interaction Code. SOURCE3D is a quasi-three-dimensional computer program that uses three-dimensional acoustics and two-dimensional cascade load response theory to calculate rotor and stator modal reflection and transmission (scattering) coefficients.

SOURCE3D is at the. CHAPTER 1 SCATTERING COEFFICIENT PLOTS This second volume of Acoustic Scattering by Three-Dimensional Stators and Rotors Using the SOURCE3D Code provides the scattering plots referenced by Volume 1 (Ref. Input waves for the stator and rotor have modal indices (s, k, n) ranging from (1,1,1) to (3,3,3), where s is the blade passing frequency (BPF) harmonic index, k the.

Get this from a library. Acoustic scattering by three-dimensional stators and rotors using the SOURCE3D code.

[Harold D Meyer; NASA Glenn Research Center.]. A novel solution is presented for the problem of three‐dimensional acoustic scattering of a time‐harmonic plane wave from doubly periodic structures.

The general problem is first reduced to a consideration of the fields over a suitably defined unit by: 9. Calculations of acoustic rough surface scattering have previously been performed by numerous researchers using parabolic equation models in two dimensions. Approaches have varied from exact solutions that re-map the rough interface to the pressure release boundary condition through a generalized method of images, approximate methods based on a perturbation approach valid for Cited by: 3.

Figure 1 displays acoustic pressure spectra at an observer located on the rotational plane at (2, 0, 0) m. The computed acoustic pressure is compared against the analytical solution suggested prediction duplicates the analytical solution, thus demonstrating the validity of the acoustic analogy solver for incident noise computation from rotating sources.

This chapter presents a point-source method to solve inverse acoustic obstacle scattering problems. The point-source method gives a new and explicit procedure to compute from the far-field pattern u∞ of a scattered field an approximation for the total acoustic field u-near the unknown point-source method then searches for the boundary of the obstacle as a zero-curve of u.

@three dimensional ~3D!# or rods in a host material @two di-mensional ~2D!#, where both the scatterers ~spheres or rods. and the host are either ﬂuids or solids appear.

2–12Experimen-tal studies were also performed8,13–15 demonstrating the use-fulness of acoustic. scattering problem by the extended obstacle only, i.e.

in the absence of the point like obstacles, and then invert the algebraic system (). To obtain this close form we use the Green’s function of the scattering by the extended obstacle. A slightly ﬀt strategy, still following the Foldy formal method, has been developed in [17, 18].

Photo-pion reactions. Collective model of ion-ion scattering. Neutrino reactions (editor of book). SUMMARY The classical normal-mode series of acoustic scattering from solid elastic cylinders and spheres is reformulated in terms of the S-function as developed in nuclear scattering theory. It is then subjected to the Watson.

Abstract: 3-D acoustic scattering characteristics calculation will play an important role in characteristic prediction, reduction and identification of an underwater target.

In this paper, 3-D acoustic scattering characteristics of an underwater complex target in near-field at high-frequency is effectively calculated based on principle of multi-beam forming and rotating platform imaging using.

This book is devoted to the mathematical and numerical analysis of the inverse scattering problem for acoustic and electromagnetic waves. In this third edition, new sections have been added on the linear sampling and factorization methods for solving the inverse scattering problem as well as expanded treatments of iteration methods and.

Book Search tips Selecting this option will search all publications across the Scitation platform Selecting this option will search all publications for the Publisher/Society in context. Three-dimensional acoustic scattering by vortical flows.

“ Scattering of acoustic waves by a three-dimensional vortex,” Sov. Phys. Acoust. The inverse scattering problem is central to many areas of science and technology such as radar, sonar, medical imaging, geophysical exploration and nondestructive testing.

This book is devoted to the mathematical and numerical analysis of the inverse scattering problem for acoustic. An acoustic scattering signature is the target strength of an object, Equation (1), three-dimensional (3-D), finite-element (FE) computer simulation system called PC-ACOLOR since the s have enabled the code to currently compute about one template per day, an adequate pace for applica.

The ASME Digital Collection. COVID Resource Page. ASME’s authoritative, online reference of current and archival literature. It provides unparalleled depth, breadth, and quality of peer-reviewed content including journals, conference proceedings and ASME Press books.

Light Scattering Problems in Astrophysics (J M Perrin) Surface Integral Operators and their Use in Acoustics and Electromagnetics (A Berthon) Acoustic Diffraction by Slender Bodies of Arbitrary Shape (M Tran-Van-Nhieu) High and Low Energy Approximations for the Electromagnetic Scattering by Irregular Objects (B Torresani).

wave. The stator is a substrate of rotated Y-cut X-propagation LiNbO 3. A moving part, namely, a slider that is made of silicon, is placed on the stator under the preloaded condition normal to the stator surface.

The preload is important to obtain thrust as a linear motor. For the mechanical output force, many projections are fabricated. The stator-rotor interaction is an important issue in turbomachinery design when the highest performances are targeted. Different characters mark the interaction process in high-pressure or low-pressure turbines depending both on the blade height and on the Reynolds number.

For small blade heights, being the stator secondary flows more important, a more complex interaction is found with. An elastic body of spherical shape is the only one of all three-dimensional objects for which the exact solution of acoustic wave scattering can be obtained.

Therefore, the problem of scattering from an elastic sphere has attracted the attention of investigators for a long time. Highly directional sources are desirables in a variety of fields for many applications. The authors report an inverse designed scattering acoustical element device that transforms an omnidirectional ultrasonic source into one highly directional.

This two-dimensional design shows an overall better modeled performance than other previously proposed, including a half-power angular width less than.arXivv1 [-ph] 10 Oct Acoustic scattering theory without large-distance asymptotics Chi-Chun Zhou,a Wen-Du Li,b,a and Wu-Sheng Daia∗ aDepartment of Physics, Tianjin University, TianjinP.R.

China bTheoretical Physics Division, Chern Institute of Mathematics, Nankai University, Tianjin,P. R. China Abstract: In conventional acoustic scattering.An illustration of an open book. Books. An illustration of two cells of a film strip. Video. An illustration of an audio speaker. Audio.

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