Proyectos

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Los objetivos propuestos y alcanzados han sido:

Investigador principal: Francisco Simón Hidalgo
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A FP7-PEOPLE-IAPP project leaded by Dr. Isabel Varela Nieto, from the IIBm Albelrto Sols (CSIC). Our contribution to this project was related with tinnitus, an uncomfortable symptom affecting severely the quality of life to about 1-2 % of adults. Most cases of persistent tinnitus are associated with hearing loss (HL) so that a high prevalence of tinnitus in Cochlear Implant (CI) candidates can be expected. Sound therapy may suppress tinnitus by compensating for sensory deprivation, reversing maladaptive plasticity, or enhancing lateral inhibition.

Investigador principal: Isabel Varela Nieto (IIBm Alberto Sols, CSIC)
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The goal of this research is to investigate the acoustic resonances of 2d and 3D open cavities by a fast and efficient method in the time domain.

A 3D open cavity for the measurement of resonances in the Anechoic Room

 

Investigador principal: Pedro Cobo Parra
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Road traffic noise amounts to roughly half of the overall ambient noise. Usual emission (vehicle emission limits) and immission (barriers, sound-reducing windows) noise control techniques have not been enough to decrease significantly the annoyance by road traffic over the last three decades. The positive effect of these control techniques has been counteracted by the increase of traffic density. Moreover, the traffic noise annoyance is highly correlated with the maximum noise levels usually produced by aggressive drivers. However, current traffic noise measurement systems are based upon an overall assessment, so that they are unable to discriminate between quiet and noisy drivers. Therefore, a near field noise measuring system is proposed in this research that is able to measure the contribution of each vehicle to the road traffic noise, allowing the detection of noisy drivers.  The system is based on two onboard microphones, one for the engine noise and other for the rolling noise.

Investigador principal: Pedro Cobo Parra
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The use of non-reflective walls to close the wind tunnel test area facilitates useful joint aerodynamic/aeroacoustic tests. Since air flows in wind tunnels at high velocities, these walls cannot be lined directly with porous/fibrous materials. This work proposes highly sound absorbing liners to be used as non-reflective walls for the test area of wind tunnels. They consist of a dual layer microperforated panel, with the second cavity filled with porous material.

Investigador principal: Pedro Cobo Parra
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Seismic oceanography techniques are able to provide oceanographic properties of the water masses by processing seismic reflection data. These techniques have reported reflected waves due to the fine structure in the ocean, whose order of magnitude is as weak as -80 dB. Thus, if we focus our attention on numerical simulation of this kind of oceanography experiments, the numerical performance of the method should allow obtaining accurate results, where the spurious reflections from the artificial boundaries of the computational grid are, at least, one order of magnitude smaller than the physical phenomena.

Investigador principal: Pedro Cobo Parra
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The two potentially noisier phases of an offshore wind farm are construction and operation. During the construction phase, high noise levels are radiated to the environment, both in air and water, due to engineering works such as pile driving. In the operation phase, the acoustic power radiated by each wind turbine is much lesser, but their usual life-span is 20-25 years.

Investigador principal: Pedro Cobo Parra
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Porous and fibrous materials provide sound absorption within a frequency band which lower limit depends mainly on its thickness. In general, low frequency absorbers require such a large thickness than they are not installed in practice, except perhaps for large anechoic chambers. Active systems, on the other hand, allow to control the input impedance of multilayer absorbers, this affording absorption in the low frequency range. Combining appropriately the properties of the passive material with those of the active system, it is possible to design efficient absorbers for broadband noise, including low frequencies, with a reduced thickness. These systems are named hybrid passive-active absorbers.

Investigador principal: Pedro Cobo Parra