Resumen

SANCHEZ-CARPINTEYRO, G.; HERNANDEZ-PEREZ, B.  y  GUTIERREZ-LUNA, C.. Predictive acoustic analysis applied to emergency plant cabin design to determine the most appropriate performance with 3 acoustic coating materials that comply with the Mexican norm NOM-081-SEMARNAT-1994. RIIIT. Rev. int. investig. innov. tecnol. [online]. 2018, vol.5, n.30. ISSN 2007-9753.

An investigation was carried out in reference to the modeling and prediction of acoustic noise of the geometry of the "Current Commercial Cabin Model" manufactured by IGSA, in comparison with a "Prototype Model" applying 3 different acoustic coating materials with the target thicknesses of 25.4 mm, 38.1mm and 50.8mm, the materials used were PVC Foam, SAN Foam Ref. (1) and a commercial material named PABA from the company POLYDAMP Ref. (2). The acoustic modeling was carried out with the software ANSYS Academic Ref. (3) provided by CIATEQ, with the acoustic extensions Ansys ACT Acoustics Extension V180.1 Ref. (4); the geometries of the models were simplified to their most basic form as well as the emergency plant with its three main components of noise generation (electric generator, motor and cooling fan), occupying the software SolidWorks Ref.(5), with the in order to optimize the mesh and the processing times in the solution of the models. In total, 18 simulations were generated in relation to the two models studied (9 in Current Cabin and 9 in Prototype Cabin). In each simulation 6 microphones were established with sound pressure level in weighting A, at an approximate height of 1.2 meters from the floor level and at one meter from the Cabin as established by the norm NOM-081-SEMARNAT-1994 Ref.(6) of which 50 samples were generated for each established microphone. A frequency of laboratory operation was set from 0 to 1500Hz where the overall model of its coating material and thickness that obtained the best performance was the "Current Commercial Acoustic Cabin Model" with Styrene Acrylonitrile Foam coating (SAN Foam) a thickness of 50.8mm in the range from 0 to 900Hz complying 100% with the Mexican norm. It was determined that the highest salient acoustic sound pressure level of the cab model is found in the regions of the upper and lateral ventilation grilles. A methodology was developed to carry out the simulation process, in order that it may be applicable for subsequent analyzes.

Palabras llave : Acoustic attenuation; sound insulation cabin; finite element acoustic analysis (FEA); analysis of acoustic coatings; acoustic enclosure for emergency plant.

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