https://www.math2market.de/Publications/1970Delany-Bazley.pdf

Acoustical properties of fibrous absorbent materials

A critical review of some traffic noise prediction models

Flow resistance information for acoustical design

A difficult challenge in geometrical acoustic modeling is computing propagation paths from sound sources to receivers fast enough for interactive applications. This paper describes a beam tracing method that enables interactive updates of propagation paths from a stationary source to a moving receiver in large building interiors. During a precomputation phase, convex polyhedral beams traced from the location of each sound source are stored in a “beam tree” representing the regions of space reachable by potential sequences of transmissions, diffractions, and specular reflections at surfaces of a 3D polygonal model. Then, during an interactive phase, the precomputed beam tree(s) are used to generate propagation paths from the source(s) to any receiver location at interactive rates. The key features of this beam tracing method are (1) it scales to support large building environments, (2) it models propagation due to edge diffraction, (3) it finds all propagation paths up to a given termination criterion without exhaustive search or risk of under-sampling, and (4) it updates propagation paths at interactive rates. The method has been demonstrated to work effectively in interactive acoustic design and virtual walkthrough applications.

/pdf/a-beam-tracing-method-for-interactive-architectural-28czp4c7v1.pdf

A beam tracing method for interactive architectural acoustics

The external ear protects the eardrum from mechanical damage by providing a narrow and extended entrance to the auditory system. It also transforms the sound field modifying and augmenting the directionality associated with head diffraction and adding substantial acoustic gain at the higher frequencies. These properties are intimately connected with the spatial perception of sound and are of considerable importance in auditory measurements and instrument design. To understand these properties it is useful to divide the acoustic antenna system into its functional components: the head, the torso and the pinna flange (Fig. 1) acting as diffracting bodies, the concha and the earcanal serving as acoustic resonators, and the eardrum providing an acoustic termination. But these components must always be seen as parts of an integrated system for it is the sound pressure transformation from the free field to the eardrum as a function of frequency, direction, and perhaps distance which is most directly linked with monaural and binaural localization and with the overall sensitivity of the hearing system.

M.E. Delany

Papers

The prediction of noise levels l10 due to road traffic

A note on the effect of ground absorption in the measurement of aircraft noise

Acoustical Characteristics of Fibrous Absorbent Material

Monopole radiation in the presence of an absorbing plane

A scale model technique for investigating traffic noise propagation