Results 31 to 40 of about 1,108,586 (322)
Acoustic design method of ship's cabin based on geometrical acoustics
Zhongguo Jianchuan Yanjiu, 2017 In light of the question of how to select the best noise control position and measures in the large noise transmission path of the cabins of a ship, based on the acoustic ray-tracing method in the theory of geometrical acoustics, and by considering the ...
FENG Aijing, WEI Qiang, ZHANG Dahai
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Acoustic Shooting and Bounce Ray Method for Calculating Echoes of Complex Underwater Targets
Applied Sciences, 2022 The acoustic scattering characteristics of a target are of great significance to the design of underwater acoustic detection systems. With the improvement in underwater weapon detection ability, the precision and accuracy of underwater target echo ...
Gang Zhao +4 more
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Geometric perturbation theory and Acoustic Boundary Condition Dynamics [PDF]
Physica D: Nonlinear Phenomena, 2020 Geometric perturbation theory is universal. A typical example is provided by the 3D wave equation, widely used in acoustics. We face vibrating eardrums as a binaural auditory input stemming from an external sound source. In the setup of internally coupled ears (ICE), which are present in more than half of the land-living vertebrates, the two tympana ...
Heider, David T., van Hemmen, J. Leo
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Geometric acoustics and coherence propagation [PDF]
The Journal of the Acoustical Society of America, 1982 The mutual coherence function of a deterministic acoustic field obeying a parabolic equation will be expressed in terms of Fourier representations of the Green functions for the field. In the short wave limit, these representations allow for a uniform treatment of the field near various real space caustics by circumventing apparent singularities.
David H. Berman, John J. McCoy
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On the sensitivity of the design of composite sound absorbing structures
Materials & Design, 2021 The acoustic properties of composite structures made of a perforated panel, an air gap, and a porous layer, can be studied numerically by a combined use of ad hoc optimization and sensitivity analysis methods.
V.H. Trinh, J. Guilleminot, C. Perrot
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Coronal Shock Waves, EUV Waves, and Their Relation to CMEs. II. Modeling MHD Shock Wave Propagation Along the Solar Surface, Using Nonlinear Geometrical Acoustics [PDF]
, 2011 We model the propagation of a coronal shock wave, using nonlinear geometrical acoustics. The method is based on the Wentzel–Kramers–Brillouin (WKB) approach and takes into account the main properties of nonlinear waves: i) dependence of the wave front ...
A. Afanasyev, A. Uralov
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Bandwidth and resolution of super-resolution imaging with perforated solids
AIP Advances, 2011 Recent experiments on acoustic superlens and hyperlens found anisotropic metamaterials constructed from periodic perforated solids can be used for super-resolution imaging.
Zixian Liang, Jensen Li
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Algebraic reflections in geometric acoustics [PDF]
Proceedings of Meetings on Acoustics, 2017 Stochastic Ray tracing is one of the most widely used geometric acoustic algorithms, and excels primarily for modelling the late room response in high frequencies. A significant bottleneck of the algorithm is the high computational cost of testing rays for intersection with geometry, and the high amount of rays required for convergence. Several methods
Erik Molin, Delphine Bard, Juan Negreira
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Experimental verification of the acoustic geometric phase
Applied Physics Letters, 2022 Optical geometric phase encoded by in-plane spatial orientation of microstructures has promoted the rapid development of numerous functional meta-devices. However, pushing the concept of the geometric phase toward the acoustic community still faces challenges.
Bingyi Liu +5 more
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Asymptotical solutions for a vibrationally relaxing gas
Mathematical Modelling and Analysis, 2009 Using the weakly non‐linear geometrical acoustics theory, we obtain the small amplitude high frequency asymptotic solution to the basic equations governing one dimensional unsteady planar, spherically and cylindrically symmetric flow in a vibrationally ...
Rajan Arora
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