... decreases gradually. Thus, FCPM is limited to the response analysis of the acoustic field with convex parameters whose uncertain levels are small. To accurately calculate the smallest closed interval vector p ∧ ( a ) of the response of the acoustic field with convex parameters whose...

.... Editor: Theodore Farabee. 08 11 2012 04 06 2013 To calculate the probability density function of the response of a random acoustic field, a change-of-variable perturbation stochastic finite element method (CVPSFEM), which integrates the perturbation stochastic finite element method...

... , the unknown coefficients of the various plate and shell displacements can be obtained. Positive directions of the forces, moments, displacements, and slopes for the shells and plates 13 10 2010 23 05 2011 22 12 2011 22 12 2011 acoustic field actuators plates...

... 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...

... influenced markedly the rotor aerodynamics. 06 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...

...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...

... and the mode shapes of the near field for three modes of this membrane. As expected, the sound pressure distributions bear similar shapes of the corresponding modes. 17 06 2009 01 09 2010 31 03 2011 31 03 2011 acoustic field convergence of numerical methods loudspeakers modal...

... 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...

... confirmation of the physical mechanisms by which vibration neutralizers can be used to minimize noise radiation. Spatially averaged single frequency reductions of up to 22 dB are experimentally demonstrated in the radiated field. acoustic field adaptive control aerospace engineering aircraft control...

... acoustic field acoustic intensity acoustic resonance acoustic resonators acoustic wave transmission aeroacoustics blades fans noise abatement rotors stators To further validate the resonator model as a control source under flow-excitation conditions, the next step was to characterize...

... 2008 acoustic field acoustic intensity ray tracing steady-state sound spatial distribution prediction SVP algorithm ray-tracing voxel technique Simulation technology has been widely applied to sound prediction in room acoustics, in which the acoustical algorithms are always...

...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...

... foams. structural acoustics pipe flow acoustic wave propagation acoustic wave absorption acoustic wave velocity acoustic field 14 05 2004 20 07 2006 2006 American Society of Mechanical Engineers ...

... the mating pool. This operation is repeated N p times until a new population is obtained. 13 10 2004 09 10 2005 architectural acoustics reverberation acoustic wave reflection acoustic field acoustic wave absorption acoustic intensity frequency-domain synthesis least...

... acoustic wave absorption acoustic impedance acoustic resonators transfer functions robust control closed loop systems acoustic intensity acoustic field self-adjusting systems control system synthesis When the control objective is destructive interference at x p in the primary...

... source decomposition principal component analysis acoustic holography acoustic signal processing acoustic field acoustic intensity source separation 20 03 2004 23 02 2005 The coherence function of two strongly coherent references The decomposed partial sound...

... Oct. 2002; Revised April 2003. Associate Editor: R. Ohayon. 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...

.... A. , and Zinn , B. T. , 1995 , “ An Exact Solution for One-Dimensional Acoustic Fields in Ducts with an Axial Temperature Gradient ,” J. Sound Vib. , 184 , pp. 389 – 402 . Kumar , B. M. , and Sujith , R. I. , 1998 , “ Exact Solution for One-Dimensional Acoustic Fields in Ducts...