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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
41

Determinação de faixas de operação de parâmetros acústicos para avaliação da qualidade sonora de salas de aula. / Determination of operating ranges of acoustic parameters for evaluation of the sound quality of classrooms.

Ikeda, Cristina Yukari Kawakita 10 December 2018 (has links)
Boas condições acústicas, para a transmissão e para o entendimento da mensagem falada, são importantes para a eficácia do processo de aprendizagem. Para tanto, além de se minimizar a intrusão do ruído externo, é fundamental que a distribuição da energia sonora no interior das salas de aula seja adequada. Quando não se adotavam soluções prescritivas, utilizava-se para projeto, apenas, o tradicional tempo de reverberação. Na literatura, há faixas de valores para outros descritores que, por falta de estudos específicos, não são empregados para salas de aula. Esta pesquisa enfoca essa lacuna no conhecimento, ou seja, estabelecimento de faixas adequadas de outros descritores que possam ser empregados na otimização do projeto acústico de salas de aula sob a perspectiva dos alunos. Para atingir esse objetivo utilizou-se de métodos de Avaliação Pós-Ocupação, com a aplicação de questionários e a medição de descritores, usando-se a técnica de medição da resposta impulsiva, de várias salas de escolas diferentes, a fim de associar os valores medidos com o grau de satisfação expressado pelos usuários dos espaços. As medições foram feitas, em oitavas, ao longo de uma malha de pontos. Os valores medidos foram complementados com simulações computacionais para avaliar outras posições no interior dos recintos. Foram analisados os descritores TR, EDT, BR, Ts, D50 e RASTI. Destes parâmetros, foram selecionados aqueles que podem ser otimizados pelas decisões de projeto arquitetônico, sendo estes: TR, EDT, Ts e RASTI. / Good acoustic conditions, for the transmission and understanding of the spoken message, are important for the effectiveness of the learning process. Therefore, in addition to minimizing the intrusion of outdoor noise, it is essential that the distribution of the sound energy inside the classrooms is adequate. When prescriptive solutions were not adopted, only the traditional reverberation time was used for design. In the literature, there are ranges of values for other descriptors that, for lack of specific studies, are not used for classrooms. This research focuses on this knowledge gap, that is, the establishment of adequate ranges of other descriptors that can be used to optimize the acoustic design of classrooms from the perspective of the students. In order to accomplish this objective, Post-Occupancy Evaluation methods were used, with the application of questionnaires and the measurement of descriptors, using the impulse response measurement technique of several classrooms from different schools, in order to associate the measured values with the degree of satisfaction expressed by its users. Measurements were made in octave bands along a mesh of points. The obtained values were complemented with computational simulations to evaluate other positions inside the rooms. The descriptors TR, EDT, BR, Ts, D50 and RASTI were analyzed. From these parameters, those that can be optimized by the architectural design decisions were selected, being these: TR, EDT, Ts and RASTI
42

Reconstrução acústica das salas de cinema projetadas pelo arquiteto Rino Levi / Acoustic Reconstruction of the movie theatres designed by the architect Rino Levi

Tamanini, Carlos Augusto de Melo 12 April 2011 (has links)
Este estudo visou realizar um resgate histórico e, através do método de modelagem acústica, reconstruir acusticamente as salas de cinema projetadas pelo arquiteto Rino Levi. Utilizando dados mensuráveis e relatos publicados por Rino e outros autores, modelos foram criados. A partir dos modelos, realizaram-se comparações e avaliações dos parâmetros acústicos e das respostas, obtidas através de mapas acústicos gerados por simulações, para verificar as técnicas e soluções empregadas pelo arquiteto. Comprovou-se que a metodologia desenvolvida pelo arquiteto para a realização do tratamento acústico da sala do cinema é pertinente e inovadora para a época, entretanto algumas técnicas e soluções, em função dos resultados apresentados, passam a ser questionadas. O Cine Ufa-Palácio, o primeiro cinema a ser projetado por Levi, apresentou o melhor desempenho acústico em função de soluções empregadas somente no seu projeto. Nos outros projetos, principalmente no Cine Universo e Piratininga, notou-se, através do desempenho acústico, que algumas soluções contribuíram para um resultado pouco satisfatório. A importância de Levi para a acústica no Brasil é incontestável, mas suas soluções, até divulgadas como muito eficientes, devem ser repensadas e tratadas com critérios para a correção de possíveis falhas. Finalmente, o contato com essas salas de cinema projetadas por Levi foi significativo, independente dos resultados, por constatar a sua visão sobre arquitetura, baseada na técnica e nos princípios científicos, enfatizando um raciocínio projetual que revela a clareza de sua arquitetura. / A historical virtual acoustical reconstruction was developed in five movie theaters designed by the architect Rino Levi from 1936 to 1941, in the cities of São Paulo and Recife, by means of computer simulations. Such approach was chosen because these movie theatres have been demised or are now used with different purposes. Rino Levi is recognized as one of the Brazilian greatest architects, and the present work shows that he was perhaps the first to introduce the scientific results of Sabine in the design of acoustical sensitive rooms. By means of the original drawings and reports published by Rino Levi and others, geometric models have been created to carry out the computer simulations. From these models, Reverberation Times and Early Decay Times were obtained, and maps of speech intelligibility parameters such as C50 and RaSTI throughout the audiences have been generated. These allowed the evaluation of the acoustical results that would have been achieved by Rino Levi in these cinemas. Although the approaches employed by Rino Levi was considered innovative at that time, it is shown that some of his solutions, particularly those related to the shapes of the internal surfaces and structures, may be questioned by the present day knowledge. It is shown that Cine-Ufa Palace, the first movie theater designed by Rino Levi, supposedly presented the best acoustic performance among the movie theatres that have been simulated, whereas the adopted solutions to other cinemas, such as Cine Universe and Cine Piratininga, may have contributed to unsatisfactory acoustical results. Finally, regardless of the criticisms that can now be made to his approaches in the acoustical design of rooms, the acoustical reconstruction of the movie theaters designed by Rino Levi was significant, because it has been possible to get acquainted with his views of architecture, which had been based on technical and scientific principles, emphasizing a project reasoning that reveals the clarity of his solutions.
43

A study of the production, character, and abatement of noise in pneumatic percussive drills.

Beiers, John Leonard. Unknown Date (has links)
No description available.
44

A study of the production, character, and abatement of noise in pneumatic percussive drills.

Beiers, John Leonard. Unknown Date (has links)
No description available.
45

A study of the production, character, and abatement of noise in pneumatic percussive drills.

Beiers, John Leonard. Unknown Date (has links)
No description available.
46

A study of the production, character, and abatement of noise in pneumatic percussive drills.

Beiers, John Leonard. Unknown Date (has links)
No description available.
47

Sonic architecture: a modulator of sound and space - National Gallery of Sound Art /

Cheung, Alla Ching-Shan, January 1900 (has links)
Thesis (M.Arch.) - Carleton University, 2006. / Compact disc. Includes bibliographical references. Also available in electronic format on the Internet.
48

Speech-on-speech masking in a front-back dimension and analysis of binaural parameters in rooms using MLS methods

Aaronson, Neil L. January 2008 (has links)
Thesis (Ph. D.)--Michigan State University. Dept. of Physics, 2008. / Title from PDF t.p. (viewed on July 22, 2009) Includes bibliographical references (p. 236-243). Also issued in print.
49

Architecture + media digital augmentations through meta media, mappings, real-time communication and interactivity /

Raheja, Kishore M. January 1900 (has links)
Thesis (M.Arch.) - Carleton University, 2007. / Includes bibliographical references (p. 106-109). Also available in electronic format on the Internet.
50

Near-field beamforming using microphone arrays.

Ryan, James G. (James Gregory), January 1900 (has links)
Thesis (Ph. D.)--Carleton University, 1999. / Also available in electronic format on the Internet.

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