Examinando por Materia "Sound intensity"
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- PublicaciónAcceso abiertoCaracterización acústica de una industria de la ciudad de Medellín por medio de intensidad acústica basado en Sonda PU(2017) Amaya Moya, Johana Milena; García Mayén, HéctorThis project "Acoustic Characterization of an industry in the city of Medellin by sound intensity based on PU probe" is oriented to test a relatively new tool in the world of acoustics, PU Probe (Pressure- Particle velocity), and it describes the theory, procedures, and results of acoustic measurements for the characterization of a plant producing concrete within a construction site by evaluating sound power as proposed in the ISO 8297 standard, based on sound pressure measurements. Then a suggested measurement protocol for estimating noise power based by means of sound intensity measurements with Microflown’s technology PU probe. In order to verify protocol’s applicability, results obtained by both methods were compared, and are presented. The results are sound power levels estimated intensity and sound pressure for controlled conditions in a tube under designed the ASTM E2611-09 standard, and concrete production plant in a construction site. In addition emission noise map industry mentioned in SoundPlan performed using as input variable with the estimated pressure levels measured with PU probe power.
- PublicaciónAcceso abiertoDiseño de una metodología alternativa que permita la caracterización de la radiación de una fuente electroacústica mediante el uso de una sonda P-U.(2017) Luján López, Luis Fernando; Estrada Duarte, Sergio Andrés; Molina Jaramillo, AlejandroThrough the study of the standards for the determination of the sound intensity and the traditional measurement protocols to obtain the descriptors of radiation of electroacoustic sources an in situ methodology was designed that allows to estimate, for a Genelec 1032A loudspeaker, the vectorial field of intensity normal to measuring surface using the PU sensor and the Microflown´s Sound Power software. We sought to estimate a scalar and a vector unit, pressure and particle velocity respectively. Through these it was possible to calculate the measured intensity of the under study loudspeaker and thus obtain a representation of the vector field of intensity, a three-dimensional graph of its radiation. It is also understood that the measurements for pressure estimation must be performed under free field conditions, because this variable is affected by the reflections of the measurement environment due it is not of the vectorial type, for which it is not necessary to consider these contributions. An algorithm was developed for the processing of the data, so that the results could be projected on each one of the measurement positions by frequencies of third of octave. The reproducibility of the method was also evaluated by measurements in different acoustic environments. In a site with acoustic treatment the measurement distance is greater than in an enclosure without treatment due to the variation of the near field. In spite of this, it was possible to obtain satisfactory results in both places keeping the same configuration in the measurement elements.