3D sound scattering by rigid barriers in the vicinity of tall buildings

Godinho, L.; António, Julieta; Tadeu, A.

doi:10.1016/s0003-682x(01)00004-4

Cited by 29 publications

(25 citation statements)

References 14 publications

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“…This study proposes an experimental setup aimed at the three-dimensional augmentation of sound surrounding a vehicle, hereafter referred to as the 'future system' (FS), which could be used in FAD for entertainment and comfort. Three-dimensional sound is being developed as a means for providing feedback to humans (Lumbreras, Sánchez & Barcia, 1996;Garas, 2000;Rozier, 2000;Godinho, António & Tadeu, 2001;Dobler, Haller & Stampfl, 2002).…”

Section: Auditory Systems In Current Vehicles: Parking Assistant and mentioning

confidence: 99%

Auditory interfaces in automated driving: an international survey

Bazilinskyy

Winter

2015

PeerJ Computer Science

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This study investigated peoples' opinion on auditory interfaces in contemporary cars and their willingness to be exposed to auditory feedback in automated driving. We used an Internet-based survey to collect 1,205 responses from 91 countries. The respondents stated their attitudes towards two existing auditory driver assistance systems, a parking assistant (PA) and a forward collision warning system (FCWS), as well as towards a futuristic augmented sound system (FS) proposed for fully automated driving. The respondents were positive towards the PA and FCWS, and rated the willingness to have automated versions of these systems as 3.87 and 3.77, respectively (on a scale from 1 = disagree strongly to 5 = agree strongly). The respondents tolerated the FS (the mean willingness to use it was 3.00 on the same scale). The results showed that among the available response options, the female voice was the most preferred feedback type for takeover requests in highly automated driving, regardless of whether the respondents' country was English speaking or not. The present results could be useful for designers of automated vehicles and other stakeholders.

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Section: Auditory Systems In Current Vehicles: Parking Assistant and mentioning

confidence: 99%

Auditory interfaces in automated driving: an international survey

Bazilinskyy

Winter

2015

PeerJ Computer Science

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“…In the frequency domain, the propagation of sound waves in a fluid medium, with density ρ and allowing a sound speed α , assuming null initial conditions, is governed by the Helmholtz equation 2 2 0 p p ω α   ∇ + =     (1) where p is the sound pressure within the fluid. The solution of this equation can only be obtained analytically for very simple configurations, while for more generic cases the use of numerical techniques becomes necessary.…”

Section: Mathematical Formulationmentioning

confidence: 99%

Iterative coupling between the MFS and Kansa’s method for acoustic problems

Godinho¹,

Soares²,

Pereira³

et al. 2013

Boundary Elements and Other Mesh Reduction Methods XXXV

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In the present work, a numerical frequency-domain model based on the joint use of two distinct meshless methods (the Method of Fundamental Solutions and Kansa's Method) is discussed. In this context, the MFS is used to model the homogeneous part of the propagation domain, while the Kansa's Method is applied to model the presence of possible heterogeneities. For Kansa's Method, the MQ RBF is used, and the optimal value of its free parameter is computed by minimizing the residual of the PDE throughout the subdomain. The coupling between the two parts of the propagation domain is performed iteratively, allowing totally independent spatial discretizations to be used for each of the sub-domains of the model. Given this strategy, the use of matching collocation points at common surfaces is not necessary. To improve the behavior of the iterative process, an optimized algorithm, based on the use of a varying relaxation parameter, is used to speed up and/or to ensure the convergence of the iterative coupling. A set of numerical results is here presented to illustrate the behavior of the proposed strategy in terms of convergence.

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“…it must be sufficiently large (Bouchon and Aki [23]). This technique is an adaptation and extension of other mathematical and numerical formulations used to solve problems such as wave propagation (Tadeu et al [24] and Godinho et al [25]). Note that Eq.…”

Section: Three-dimensional Problem Formulation and Green's Functions mentioning

confidence: 99%

Fundamental solutions for transient heat transfer by conduction and convection in an unbounded, half-space, slab and layered media in the frequency domain

Simões

Tadeu

2005

Engineering Analysis with Boundary Elements

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Analytical Green's functions in the frequency domain are presented for the three-dimensional diffusion equation in an unbounded, halfspace, slab and layered media. These proposed expressions take into account the conduction and convection phenomena, assuming that the system is subjected to spatially sinusoidal harmonic heat line sources and do not require any type of discretization of the space domain. The application of time and spatial Fourier transforms along the two horizontal directions allows the solution of the three-dimensional time convection-diffusion equation for a heat point source to be obtained as a summation of one-dimensional responses. The problem is recast in the time domain by means of inverse Fourier transforms using complex frequencies in order to avoid aliasing phenomenon. Further, no restriction is placed on the source time dependence, since the static response is obtained by limiting the frequency to zero and the high frequency contribution to the response is small.The proposed functions have been verified against analytical time domain solutions, known for the case of an unbounded medium, and the Boundary Element Method solutions for the case of the half-space, slab and layered media. q

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3D sound scattering by rigid barriers in the vicinity of tall buildings

Cited by 29 publications

References 14 publications

Auditory interfaces in automated driving: an international survey

Auditory interfaces in automated driving: an international survey

Iterative coupling between the MFS and Kansa’s method for acoustic problems

Fundamental solutions for transient heat transfer by conduction and convection in an unbounded, half-space, slab and layered media in the frequency domain

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