Caracterización acústica de silenciadores de vehículos con superficies sinterizadas
[EN] This Master's Thesis focuses on the s tudy of the acoustic behavior of automotive silencers incorporating sintered surfaces as a potential substitute for the usual dissipative silencers. Dissipative silencers have fibrous materials inside to produce the sound attenuation, exhibit ing p...
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| Tipo de recurso: | tesis de maestría |
| Fecha de publicación: | 2016 |
| País: | España |
| Institución: | Universitat Politècnica de València (UPV) |
| Repositorio: | RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia |
| Idioma: | español |
| OAI Identifier: | oai:riunet.upv.es:10251/75407 |
| Acceso en línea: | https://riunet.upv.es/handle/10251/75407 |
| Access Level: | acceso abierto |
| Palabra clave: | Caracterización acústica Silenciadores Medida experimental Superficies sinterizadas Elementos finitos. INGENIERIA MECANICA Máster Universitario en Ingeniería Mecánica-Màster Universitari en Enginyeria Mecànica |
| Sumario: | [EN] This Master's Thesis focuses on the s tudy of the acoustic behavior of automotive silencers incorporating sintered surfaces as a potential substitute for the usual dissipative silencers. Dissipative silencers have fibrous materials inside to produce the sound attenuation, exhibit ing problems associated with degradation of t he fibers , polluting the environment and causing potential problems to population. As a first step a bibliographic rev iew is carried out relate of physical acoustic models for silencers and pipes, based on the analysis of one - dimensional models and associ ated matrix representation. Besides a brief description of the commonly used types of silencers is developed, and the main parameters used to evaluate the sound attenuation are also described. The limitations found ed in plane wave models show ed the need to find nume rical solutions based on computational approaches such as finite elements method to solve problems in s ilencer s with complex configurations and a wide frequency range of analysis. In this work, a deep detailed study of surfaces manufactured by si ntering processes is carried out. These surfaces are characterized by having a n almost constant real part of impe dance while the i maginary part slightly depended on the frequency , the corresponding values closely related to the thickness and porosity of the plates. As it is shown along the current investigation, this type of acoustic elements work s very well in the m edium and high frequency range . V In addition , an experimental acoustic characterization of sintered metal surfaces in the absence of mean flow is developed, using the acoustic test bench of the research group, whose operation is based on the method of trans fer matrix. Once the most relevant properties of each sample have been obtained, the results are introduced into the commercial finite element package COMSOL with the purpo se of evaluating the sound attenuation produced by silencers incorporating circular ducts manufactured by sintering and having the same acoustic properties of the aforementioned samples. As it will be shown, single and multichamber silencer configurations will be taken into account. |
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