Journal ArticleDOI
Efficiency of single noise barriers
TLDR
In this paper, a numerical model is described which enables the sound field in the region of outdoor noise barriers to be calculated by using the boundary element method, and the non-uniqueness of solution of the method, producing unreliable results in some conditions, is discussed.About:
This article is published in Journal of Sound and Vibration.The article was published on 1991-04-22. It has received 144 citations till now. The article focuses on the topics: Noise barrier & Noise control.read more
Citations
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Journal ArticleDOI
Acoustic design by topology optimization
TL;DR: In this article, the authors proposed a topology optimization method based on continuous material interpolation functions in the density and bulk modulus to reduce the sound pressure amplitude in the shadow zone behind a sound barrier.
Proceedings ArticleDOI
Modeling acoustics in virtual environments using the uniform theory of diffraction
TL;DR: A efficient way for computing the acoustical effect of diffraction paths using the UTD for deriving secondary diffracted rays and associated diffraction coefficients is proposed and a real-time auralization system demonstrating that diffraction dramatically improves the quality of spatialized sound in virtual environments is demonstrated.
Journal ArticleDOI
Performance of noise barriers with various edge shapes and acoustical conditions
Takashi Ishizuka,Kyoji Fujiwara +1 more
TL;DR: In this paper, the performance of barriers having different shapes and surface conditions were tested using the boundary element method in a well-controlled environment and the insertion losses for six receiver positions were averaged and compared.
Journal ArticleDOI
The Boundary Element Method in Acoustics: A Survey
TL;DR: The boundary element method (BEM) was initially developed for Laplace's equation and has been applied in the context of acoustics or Helmholtz problems as mentioned in this paper, including half-space problems and modeling the acoustic field surrounding thin screens.
Journal ArticleDOI
The performance of t-profile and associated noise barriers
TL;DR: In this paper, an integral equation formulation of the problem is solved using the boundary element approach, and the results for the mean insertion loss over a range of receiver positions for a broadband source are also presented.
References
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Journal ArticleDOI
Acoustical properties of fibrous absorbent materials
M.E. Delany,E.N. Bazley +1 more
TL;DR: In this article, the authors investigated the acoustical properties of a range of fibrous absorbent materials and showed that the characteristic impedance and propagation coefficient of these materials normalize as a function of frequency divided by flow-resistance.
Journal ArticleDOI
Noise reduction by screens
TL;DR: In this article, the authors present experimental data on the diffraction of sound round a semi-infinite plane screen in a free field and describe a method for calculating the shielding effect of a real screen employed for the purpose of noise reduction.
Journal ArticleDOI
Effective flow resistivity of ground surfaces determined by acoustical measurements
TL;DR: In this paper, it was shown that Chessell's single-parameter theory can be used to predict the measured transmission spectra between a source and receiver located above ground surfaces having a wide range of acoustic impedance.
Journal ArticleDOI
Sound attenuation by barriers
U.J. Kurze,G.S. Anderson +1 more
TL;DR: In this article, a simple analytic expression is proposed for the calculation of the excess attenuation due to diffraction around a barrier of sound rays emanating from a point source; this analysis takes into account oblique sound incidence at the barrier and also includes the transition region from the bright zone to the shadow zone behind the barrier.
Fhwa highway traffic noise prediction model
T M Barry,J A Reagan +1 more
TL;DR: In this paper, the FHWA method for predicting noise generated by constant speed highway traffic is presented, which is intended to be a users' manual as well as a reference document detailing the development, use, and limitations of the prediction method.