..., are presented for the response analysis of the acoustic field with convex parameters. In FCPM, the response of the acoustic field with convex parameters is expanded with the first-order Taylor series at the nominal values of convex parameters. In SCPM, the response of the acoustic field with convex parameters...

... (3) n · ∇ p = - j ρ ω v n   on   Γ N (4) n · ∇ p = - j ρ A n p   on   Γ R To simplify the process of analyzing the random acoustic field, Eq. (6) can be rewritten as (11) Zp = F where Z is the acoustic...

... , Sound and Structural Vibration , Academic , London. 29 Skelton , E. A. , and James , J. H. , 1997 , Theoretical Acoustics of Underwater Structures , Imperial College Press , London. 13 10 2010 23 05 2011 22 12 2011 22 12 2011 acoustic field...

... around a circular arc of radius equal to 80 jet diameters from the jet axis. Data on the jet acoustic field for the partially open duct were obtained and compared with those with a free jet and with a closed duct. The results suggest that for the partially open duct the overall sound pressure level...

..., aimed at alleviating the corresponding cabin noise. The aeroacoustoelastic plant model considered in the control problem is obtained by combining modal approaches for the description of cabin acoustic field and fuselage shell dynamics, with a boundary element method scattering formulation...

... 10 2009 19 01 2011 26 07 2011 26 07 2011 acoustic field aeroacoustics aerodynamics anechoic chambers (acoustic) blades fans microphones noise abatement vortices As prevailing noise regulations become more stringent, the blade design of modern...

...Konstantin I. Matveev; Sungmin Jung The subject of this paper is modeling of low-amplitude acoustic fields in enclosures with nonuniform medium and boundary conditions. An efficient calculation method is developed for this class of problems. Boundary conditions, accounting for the boundary-layer...

... 2011 31 03 2011 acoustic field convergence of numerical methods loudspeakers modal analysis sound pressure field elastically supported membrane modal analysis Since the first moving-coil loudspeaker patented in 1924, loudspeaker technology has evolved and become quite...

... is presented via the identification of acoustic sources of ARIANE 5 from lift-off in-flight measurements. As the lift-off acoustic field is random in nature, the optimization process is performed using the cross-correlation functions matrix measurement. After having characterized the sources from pressure...

...J. Ignacio Palacios; Jordi Romeu; Andreu Balastegui Global active control of sound can be achieved inside enclosures under low modal acoustic fields. However, the performance of the system depends largely on the localization of the elements of the control system. For a purely acoustic active...

... while the others are held constant. 31 01 2007 20 09 2007 05 06 2009 acoustic field adaptive control aerospace engineering aircraft control feedback hierarchical systems jet engines noise abatement plates (structures) structural acoustics vibration control...

... to mismatch the number of rotor and stator blades to prevent dominant tonal noise in the acoustic spectrum. Their paper also incorporates the study of duct acoustics into a model of rotor-stator interactions and investigates the effect of cut-off frequency on an axial fan noise production. acoustic...

... the SPL in steady-state sound fields, and the results were consistent with the predicted results. 06 10 2007 11 05 2008 22 10 2008 acoustic field acoustic intensity ray tracing steady-state sound spatial distribution prediction SVP algorithm ray-tracing voxel technique...

...C. X. Bi; X. Z. Chen; R. Zhou; J. Chen In a semi-free field, the acoustic field is composed of two components: the direct sound and the reflected sound. Because it is difficult to separate the direct sound from the acoustic field, conventional nearfield acoustic holography (NAH) methods cannot...

... on rate of attenuation for circular duct with a = 0.10 m , c = 0.12 m , and M = 0 14 05 2004 20 07 2006 structural acoustics pipe flow acoustic wave propagation acoustic wave absorption acoustic wave velocity acoustic field Circular...

... → ∞ , S ̂ m → 0 . As a consequence, the sound field produced by the actual source is equivalent to a collection of point sources, each with appropriate strength to be determined by additional conditions. All this boils down to the idea that the acoustic field of a complex radiator can...

... , pp. 429 – 436 . 28 04 2003 03 05 2005 active noise control acoustic wave absorption acoustic impedance acoustic resonators transfer functions robust control closed loop systems acoustic intensity acoustic field self-adjusting systems control...

.... 1053-5888 10.1109/79.91217 , 8 ( 2 ), pp. 14 – 36 . 20 03 2004 23 02 2005 acoustic holography acoustic signal processing acoustic field acoustic intensity source separation near field acoustic holography the cyclic spectrum density partial source decomposition...

.... 01 Oct 2002 01 April 2003 04 05 2004 vibrations acoustic field transport processes The analysis of high-frequency structural vibration and structure-borne sound has been the subject of intense research for the past decades. Generally there had been mainly two classes...

... wave type solutions are derived. Exact explicit expressions for acoustic pressure and velocity are then derived for these profiles. The acoustic field in a homogeneous media can be described by the superposition of outward and inward propagating waves, e.g., in a spherical co-ordinate system...