Shear Flow Effect On The Propagation And Attenuation Of Sound Waves
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Shear Flow Effect on the Propagation and Attenuation of Sound Waves in an Acoustically Treated Annular Duct
Author | : Mikhail Nageb Mikhail |
Publisher | : |
Total Pages | : 236 |
Release | : 1973 |
Genre | : Aerothermodynamics |
ISBN | : |
On the interactions of sound waves and vortices
Author | : César Legendre |
Publisher | : Lulu.com |
Total Pages | : 378 |
Release | : 2015-03-17 |
Genre | : Science |
ISBN | : 1326232851 |
The effects of vortical mean flows on the propagation of acoustic waves are numerous, from simple convection effects to instabilities in the acoustic phenomena, including absorption, reflection and refraction effects. Therefore, the role of vorticity in acoustic propagation besides noise generation has been a subject of controversial discussions since the foundation of aeroacoustics. In this work, a theoretical study with subsequent industrial applications has been performed, concerning the derivation of a family of scalar operators for aeroacoustics based in total enthalpy terms and including mean vorticity effects in the propagation.
Acoustic fields and waves in solids
Author | : B.A. Auld |
Publisher | : Рипол Классик |
Total Pages | : 432 |
Release | : 1973 |
Genre | : Technology & Engineering |
ISBN | : 5885013438 |
Volume One begins with a systematic development of basic concepts (strain, stress, stiffness and compliance, viscous clamping) and coordinate transformations in both tensor and matrix notation. The basic elastic field equations are then written in a form analogous to Maxwell's equations. This analogy is then pursued when analyzing wave propagation in both isotropic and anisotropic solids. Piezoelectricity and bulk wave transducers are treated in the final chapter. Appendixes list slowness diagrams and material properties for various crystalline solids.
Experimental Validation of a Two-dimensional Shear-flow Model for Determining Acoustic Impedance
Author | : Tony L. Parrott |
Publisher | : |
Total Pages | : 56 |
Release | : 1987 |
Genre | : Acoustic impedance |
ISBN | : |
Springer Handbook of Acoustics
Author | : Thomas Rossing |
Publisher | : Springer Science & Business Media |
Total Pages | : 1179 |
Release | : 2007-06-21 |
Genre | : Science |
ISBN | : 0387304460 |
This is an unparalleled modern handbook reflecting the richly interdisciplinary nature of acoustics edited by an acknowledged master in the field. The handbook reviews the most important areas of the subject, with emphasis on current research. The authors of the various chapters are all experts in their fields. Each chapter is richly illustrated with figures and tables. The latest research and applications are incorporated throughout, including computer recognition and synthesis of speech, physiological acoustics, diagnostic imaging and therapeutic applications and acoustical oceanography. An accompanying CD-ROM contains audio and video files.
Combustion Noise
Author | : Anna Schwarz |
Publisher | : Springer Science & Business Media |
Total Pages | : 304 |
Release | : 2009-06-17 |
Genre | : Technology & Engineering |
ISBN | : 3642020380 |
November, 2008 Anna Schwarz, Johannes Janicka In the last thirty years noise emission has developed into a topic of increasing importance to society and economy. In ?elds such as air, road and rail traf?c, the control of noise emissions and development of associated noise-reduction techno- gies is a central requirement for social acceptance and economical competitiveness. The noise emission of combustion systems is a major part of the task of noise - duction. The following aspects motivate research: • Modern combustion chambers in technical combustion systems with low pol- tion exhausts are 5 - 8 dB louder compared to their predecessors. In the ope- tional state the noise pressure levels achieved can even be 10-15 dB louder. • High capacity torches in the chemical industry are usually placed at ground level because of the reasons of noise emissions instead of being placed at a height suitable for safety and security. • For airplanes the combustion emissions become a more and more important topic. The combustion instability and noise issues are one major obstacle for the introduction of green technologies as lean fuel combustion and premixed burners in aero-engines. The direct and indirect contribution of combustion noise to the overall core noise is still under discussion. However, it is clear that the core noise besides the fan tone will become an important noise source in future aero-engine designs. To further reduce the jet noise, geared ultra high bypass ratio fans are driven by only a few highly loaded turbine stages.