Vibration Testing
Mostrando 1-12 de 26 artigos, teses e dissertações.
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1. PARTICLE IMAGE VELOCIMETRY FOR ESTIMATING THE YOUNG’S MODULUS OF WOOD SPECIMENS
ABSTRACT Proposing technological innovations in the investigation of the structure and behaviour of wood is important to optimize its use. The assimilation of methods diffused in other areas, such as particle image velocimetry (PIV), can allow a rich range of information for different aspects. The aim of this study was to estimate the Young’s modulus usin
CERNE. Publicado em: 09/09/2019
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2. Assembly and Testing of a Thermal Control Component Developed in Brazil
ABSTRACT: The optical solar reflector is basically a mirror of second surface with low absorptivity/emissivity ratio and negligible degradation in the space environment, which makes it an excellent coating for thermal control of satellites. It works as a radiator and is used in particular parts of the external surfaces of the satellites in order to reject th
J. Aerosp. Technol. Manag.. Publicado em: 2017-06
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3. Estudo da relação entre propriedades de compósitos de fricção aplicados a sistemas de freio a disco e a propensão à ocorrência de Squeal Noise
Automotive brake systems are very often susceptible to generate high frequency noise as a result of a self excited vibration. This phenomenon is generically nominated brake squeal noise and is the subject of many studies which intend to identify and describe its exciting mechanism and to propose counter measures to avoid its occurrence. One key subject yet t
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2012
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4. Modelagem de arquibancada temporária visando investigação de problemas de vibração devido à movimentação de espectadores / MODELING OF TEMPORARY GRANDSTAND AIMING TO INVESTIGATE VIBRATION PROBLEMS DUE TO MOVEMENT OF SPECTATORS
Estruturas de arquibancadas temporárias estão sujeitas a carregamentos dinâmicos. Isto se deve principalmente ao tipo de uso a que são submetidas. Problemas de vibração foram detectados nestas estruturas e ocorrência de acidentes vêm sendo registradas. Neste sentido, faz-se necessário estudo e identificação das características dinâmicas dos comp
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/03/2011
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5. Determination of rheological properties of fresh concrete and similar materials in a vibration rheometer
A vibration rheometer has been developed for the purpose of determining the viscosity coefficient and the yield value of fresh concrete under vibration. The main parts of the apparatus, a test specimen and a vibration source form a unitary oscillatory system whose parameters can be measured with sufficient precision. Two types of fine grained reference mater
Materials Research. Publicado em: 22/12/2011
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6. Estudo de VIM - Movimentos Induzidos por Vórtices em plataformas do tipo monocoluna: abordagem numérico-experimental e impactos no sistema de amarração. / VIM study - Vortex Induced Motions in monocolumn type platforms: numeric-experimental approach and impact on mooring system.
The vortex induced vibration VIV is a main subject studied in the offshore engineering, having its name adapted to VIM by the occurrence in Spar platforms in the Gulf of México. As the first monocolumn unit, the Sevan Piranema, was in Northeast Brazil in 2007, VIM occurrence in cylindrical units like this was questioned, having the mooring lines design dime
Publicado em: 2011
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7. Effect of the simulated periodontal ligament on cast post-and-core removal using an ultrasonic device
ABSTRACT OBJECTIVE: The aim of this study was to evaluate the effect of simulated periodontal ligament (SPDL) on custom cast dowel and core removal by ultrasonic vibration. MATERIAL AND METHODS: Thirty-two human maxillary canines were included in resin cylinders with or without SPDL made from polyether impression material. In order to allow tensile testing,
Journal of Applied Oral Science. Publicado em: 2010-10
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8. CONTRIBUTION TO THE CONTROL OF ELECTRODYNAMIC VIBRATION MACHINES / CONTRIBUIÇÃO AO CONTROLE DE MÁQUINAS DE VIBRAÇÃO ELETRODINÂMICAS
This work presents contributions to the sinusoidal acceleration control of electrodynamic shakers applied in vibration testing. Considering the importance of sine tests to identify critical frequencies of operation and to determine mechanical weakness in the specified performance of specimens, vibration controllers are designed to reproduce the amplitude and
Publicado em: 2009
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9. Reticulação de compostos poliméricos para recobrimento de superfícies
Coating of cotton fiber is employed in the textile industry in order to increase the mechanical resistance of the yarns, that is, resistance to vibration, friction, impact and elongation, which are some of the forces the yarn is subjected during the weaving process. The choice of the coating material is extremely important, since it can provide the best perf
Publicado em: 2009
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10. Fatores de riscos para ocorrÃncia de Ãlcera nos pÃs em portadores de diabetes mellitus / Risk factors for the occurrence of foot ulcers in patients with diabetes mellitus
Diabetes Mellitus (DM) is at the present time one of the most important world problems of health, so much in terms of number of affected people, disability, premature mortality, as of the costs involved in your control and in the treatment of your complications (CONSENT..., 1997). Diabetic foot ulceration is the cause more common of amputations non traumatic
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/10/2002
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11. Identificação modal de uma estrutura aeronáutica via algoritmo de realização de sistemas / Modal identification of an aeronautical structure via the eigensystem realization algorithm
The determination of the dynamic characteristics of aircraft structures has become an extremely important issue in the aerospace industry, primarily due to the continuous demand for lighter and consequently more flexible structures. In this context, most aerospace structural system must be subjected to some form of modal verification prior to flight in order
Publicado em: 2002
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12. Processamento de compósitos C-SiCxOy via pirólise polimérica para aplicações termo estruturais / Processing of SICxOy composites by polymeric pyrolysis to thermo-structural applications
Composites are heterogeneous materials made by one or more types of reinforcements, disposed or not in a definied direction, which is dispersed in a ceramic, metallic or polymeric matrix. The combination of these materials permits that the intrinsic properties from each one of the components contribute in the formation of a new material having characteristic
Publicado em: 2000