A unified approach for the numerical simulation of vowels is presented, which accounts for the self-oscillations of the vocal folds including contact, the generation of acoustic waves and their propagation through the vocal tract, and the sound emission outwards the mouth. A monolithic incompressible fluid-structure interaction model is used to simulate the interaction between the glottal jet a...

In direct analogy to the electronic band structure found in semiconductors andthe photonic bands for light in a medium with a periodic dielectric constant, a periodic density variation in a fluid can give rise to sonic frequency passbands and band gaps. Hence, a fluid medium can be constructed that prohibits ound propagation at certain frequencies while allowing practically free propagation at ...

Microbubbles, either in the form of free gas bubbles surrounded by a fluid or encapsulated bubbles used currently as contrast agents for medical echography, exhibit complex dynamics under specific acoustic excitations. Nonetheless, considering their micron size and the complexity of their interaction phenomenon with ultrasound waves, expensive and complex experiments and/or simulations are requ...

Articulatory representations are expected to bring better speech recognition results. This requires to estimate the parameters of a speech production model from the speech sound, problem known as acoustico-articulatory inversion. Known methods to solve this problem usually introduce a heavy computational cost. Alternately, it is known that Linear Prediction analysis offers an analogy with acous...

Three statistical jet noise prediction models are compared for a representative set of single-stream cases, which include cold and hot jets the Strategic Investment in Low-Carbon Engine Technology experiment at an acoustic Mach number 0.875 as well NASA small rig numbers 0.5 0.9. The implemented those proposed by Tam Auriault (Jet Mixing Noise from Fine-Scale Turbulence,” AIAA Journal, Vol. 37,...

Ambient noise can be used to produce images of submerged objects using the mean intensity of the backscattered energy, a technique coined ‘‘acoustic daylight’’ because of its direct analogy to vision. It is suggested that there may be substantial additional information in higher moments of the data. At high frequencies ~.10 kHz!, absorption suppresses long-range propagation so that a received s...

The paper presents a low-order prediction scheme for the noise change in multistream jets when the nozzle geometry is altered from a known baseline. The essence of the model is to predict the changes in acoustics due to the redistribution of the mean flow as computed by a Reynolds-Averaged Navier Stokes (RANS) solver. A RANS-based acoustic analogy framework is developed that addresses the noise...