The surface waves traveling on tip vortex cavities are one of the main contributors to underwater radiated noise (URN). However, these cannot be easily predicted, especially mode associated with cavity volume variations, which hinders research into hydroacoustic mechanism. This paper presents a method for extracting from numerical predictions, successfully captured all theoretical dispersion re...

This study examines how analogy affects problem-solving in ideation phase of design among architects and engineers. For this purpose, a design problem was given to master and Ph.D. students of engineering and architecture. They were given two optional analogy sources to choose and be inspired by one. From the analysis of design sessions, using different coding groups and the application of the ...

The Lighthill acoustic analogy, as embodied in the Ffowcs Williams{Hawkings (FW{H) equation, is compared with the Kirchho formulation for moving surfaces. A comparison of the two governing equations reveals that the main Kirchho advantage (namely nonlinear ow e ects are included in the surface integration) is also available to the FW{H method if the integration surface used in the FW{H equation...

A computational aeroacoustics prediction tool based on the application of Lighthill's theory is presented to compute noise from subsonic turbulent jets. The sources of sound are modeled by expressing Lighthill's source term as two-point correlations of the velocity fluctuations and the sound refraction effects are taken into account by a ray tracing methodology. Both the source and refraction m...

Image analogies is a framework for processing images by example. Image analogies uses training data A and A′ in order to learn a filter that can be applied to an unfiltered target image B to produce an analogous image B′. This means that B′ relates to B the same way A′ relates to A. The framework is general and can be applied to many different applications. Typical applications for image analog...

The self-noise generated by a sharp-edged strut immersed in low Mach number flow is predicted using a hybrid computational fluid dynamics (CFD) boundary element method (BEM) technique. The fluctuating flow field is obtained using an incompressible CFD solver. A high-order reconstruction scheme is used to extract acoustic sources based on Lighthill’s analogy from the flow field data. Acoustic wa...

Brief experience with reliable spectral characteristics of a listening context can markedly alter perception of subsequent speech sounds, and parallels have been drawn between auditory compensation for listening context and visual color constancy. In order to better evaluate such an analogy, the generality of acoustic context effects for sounds with spectral-temporal compositions distinct from ...