ARCHITECTURAL ACOUSTIC

Author: ESCUDER SILLA EVA MARÍA.
Year: 2004.
University: POLITÉCNICA DE VALENCIA [www.upv.es].
Place of defense: Dep. Fisica Aplicada.
Place of preparation: Universidad Politécnica de Valencia.

Summary: The purpose of this dissertation focuses on the study of acoustic behavior of multilayer structures, using as a tool, including the so-called "near-field acoustic Holography" (NAH, Nearfield Acoustical Holography). The findings and tools developed in this study have implications in two areas, soundproofing partitions with multilayer light, and the optimization of radiation electroacoustic systems based on the vibration of a panel caused by an exciter dynamic type (Case the speakers drawings). The process of getting accurate predictions of the behavior of multilayer structures, both from the standpoint of the implementation acoustics of the building, as electroacústico (improved performance loudspeaker), you should leave, necessarily a precise knowledge of the noise characteristics of the components, ie each of the layers. This study represents the first phase of research and work. The validation of theories about soundproofing leads you testing different materials and configurations. The object is to maximize the rate of isolation of a certain configuration, tried to reduce costs as much as possible. The study of acoustic behavior of different configurations often handled in camera transmission. The results of the measures under these conditions need not coincide with those obtained with measures in place since the installation conditions are somewhat uncontrollable. There are various jobs where they develop different models, theories and measurement techniques for this purpose, since theories and models to characterize absorbent materials to characterization methods of absorbent materials measured in the tube Kundt. There are also measures of a given variable acoustics, can obtain the input parameters required for progr

Author: YEBRA CALLEJA M. SOLEDAD.
Year: 2004.
University: ALICANTE [www.ua.es].
Place of defense: ESCUELA POLITÉCNICA.
Place of preparation: ESCUELA POLITÉCNICA SUPERIOR.

Summary: The overall purpose of this paper is to establish a framework for building noise in a university environment, with the determination of minimum specifications that must be met so that its functionality is appropriate to their original idea; transmit, develop, share and promote knowledge. The first part discusses the noise characteristics of urban and architectural environment that surrounds the University of Alicante, from the characterization parameters to environmental levels that determine the acoustic insulation and packaging of the sites considered, with particular emphasis on the classroom and auditoriums. In the second part, establishing a method to obtain an indicator of the inteligibnilad real and comprehensive manner that addresses the process of transmission of information that takes place in the classroom in particular. This means that they must be dependent delos architectural parameters associated with the propagation of acoustic field and also those relating to the protection against possible aggression sound. There must contemplate reliable means of the human element, both from the viewpoint of the recipients of the messages as the quality of the broadcast, which involved artifacts distracting and are present in all people and congregation by: pace, diction, tone, voice power and other resources dela occasional rhetoric teacher. It will carry out a research on the values of intelligibility that are reached during the speech teacher in a classroom of the university in normal conditions are not forced, or what happens on a daily basis.

Author: DELANNOY ARRIAGA JAIME.
Year: 2005.
University: POLITÉCNICA DE MADRID [www.upm.es].
Place of defense: E.T.S.ING. INDUSTRIALES.
Place of preparation: E.T.S.ING. INDUSTRIALES.

Summary: The main motivation for this research doctoral thesis was to investigate the degree of perception people have to change in the soundproofing of homes. It is now increasingly necessary to propose measures aimed at improving the sound environment in cities. One question which arises, before the increase in noise pollution, is whether the measures for improving the demands in the construction ordinances are perceived satisfactorily by the people. Improved acoustic housing an increase in the isolation of their components (walls, ceiling, doors, windows, etc..). Among the most important physical variables that govern the behavior of sound insulation are: stiffness, mass and damping. As overall goal was raised subjectively quantify the degree of sensitivity of people to the vagaries of sound insulation in the area of convergence, changing only the buffer; parameterized by the loss factor (). Psychophysical sampling was performed at 382 and 106 subjects, which won the Threshold Differential Intensity. The benchmark used to build the samples was hearing = 0.04. The results show that increasing the minimum loss factor, which is capable of causing a change psicoacústicamente noticeable in the sound insulation for a regular listener, it is / Eref = 0.08; expressed as a fraction of Weber. And that equals DL (dB) = 0.32. The modeling analysis of soundproofing show that, when applied a relative increase in Factor differential loss equivalent to the threshold, you get a change of Rw equal to 0.74 dB for a panel of plaster. This result suggests that an improvement of less than 1 dB weighted is clearly perceived by a listener normal.

Author: FERNANDEZ BERLANGA MARCOS DAVID.
Year: 2005.
University: POLITÉCNICA DE MADRID [www.upm.es].
Place of defense: E.T.S. ING. INDUSTRIALES.
Place of preparation: E.T.S. ING. INDUSTRIALES.

Summary: This research is aimed at studying and providing solutions for problems associated with industrial noise. In this research creates a database that will contain parameters standardized and harmonized, both objective and subjective, on the characterization of industrial machinery. The important thing is not so much the number of machines to be tested but lay the foundation for any research group, engineering, manufacturer, etc.. To carry out these tests and add to the base data from other industrial machines, and even use the tool to other machines. It applies in the development of research quality sound that is one of the most innovative acoustic techniques at the time of testing a product or machine from the subjective point of view. Moreover be carried out extensive research on the results of tests conducted in a manner that correlacionen, to the extent possible, the results acoustic with psicoacústicos. To develop such studies will be necessary to measure, among other things, the sound power of a large number of machines. Therefore, describing existing methods of measurement and will consider any alternative to situations in which they are not appropriate. Through this research is intended to provide constructive solutions on the acoustic design of the machines aimed at reducing noise and the inconvenience they produce, seek new acoustic parameters or psicoacústicos or determine who best represent the industrial noise, and create a code classification of machinery to take into account the perception of noise.