Vibration Tests
Mostrando 1-12 de 93 artigos, teses e dissertações.
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1. Glottal Closure inWomen with No Voice Complaints or Laryngeal Disorders
Abstract Introduction The understanding of normal vocal production is essential to guide any voice professional as it is fundamental to understand the effects of the posterior glottal gap on the vocal quality. Objective The aim of the present study was to verify the association between glottic closure, acoustic parameters, and some characteristics of the
Int. Arch. Otorhinolaryngol.. Publicado em: 25/11/2019
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2. Avaliação da atividade antimicrobiana e adsortividade de nanopartículas de sílica dopadas com CuO
RESUMO Nanomateriais exibem propriedades que se aplicam nas mais variadas áreas, entre estas, na área da saúde e agrícola, nas quais as pesquisas vêm aumentando progressivamente. Neste trabalho sintetizamos nanopartículas de sílica não porosas dopadas com óxido de cobre (CuO) usando método de Stöber com pequenas modificações. Em adição, a ativ
Matéria (Rio J.). Publicado em: 20/05/2019
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3. Effectiveness of track stiffness reduction in attenuation of metro induced vibrations received by historical buildings
Abstract Preservation of historical buildings is a main challenge in civil engineering field. One of the main concerns in this regard is metro induced vibration received by historical structures. There is a need to evaluate effectiveness of vibration mitigation measures in preservation of monumental buildings. The most widely used method of reducing metro vi
Lat. Am. j. solids struct.. Publicado em: 03/12/2018
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4. Influence of water in the MQL technique in the grinding of steel AISI 4340 using CBN wheels
Abstract Usually, machining employs cooling methods to avoid high temperatures. In most cases, the cutting fluid is applied with high flow and low pressures. This technique consumes a large amount of cutting fluid that causes serious problems in the environment and in the health of the worker. An alternative to the conventional cooling method is the Minimum
REM, Int. Eng. J.. Publicado em: 2018-07
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5. 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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6. An Enhanced Random Vibration and Fatigue Model for Printed Circuit Boards
Abstract Aerospace vehicles are mostly exposed to random vibration loads during its operational lifetime. These harsh conditions excites vibration responses in the vehicles printed circuit boards, what can cause failure on mission functionality due to fatigue damage of electronic components. A novel analytical model to evaluate the useful life of embedded el
Lat. Am. j. solids struct.. Publicado em: 2017
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7. Load Rate Effects in Adhesive Single Lap Joints Bonded with Epoxy/Ceramic Composites
Abstract The present paper is concerned with the analysis of the effect of the loading rate in a particular class of single lap joints used in the oil industry. The adhesive/adherend system consists of ASTM A36 steel plates bonded with an epoxy/ceramic composite. The loading rate sensitivity is analysed considering two different situations: (i) strain contro
Lat. Am. j. solids struct.. Publicado em: 2016-10
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8. A New Approach for Severity Estimation of Transversal Cracks in Multi-layered Beams
Abstract Nowadays, the damage severity evaluation in mechanical structures is mostly performed by analyzing the natural frequency shift. The non-isotropic materials, as the multi-layered ones, are wide-spread in industrial applications, due to their interesting physic-mechanical properties. Thus, a deeper approach of multi-layered beams becomes an important
Lat. Am. j. solids struct.. Publicado em: 2016-08
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9. Vibration and Energy Dissipation of Nanocomposite Laminates for Below Ballistic Impact Loading
Abstract Composite laminates are made of glass woven roving mats of 610gsm, epoxy resin and nano clay which are subjected to projectile impact. Nano clay dispersion is varied from 1% to 5%. Impact tests are conducted in a gas gun setup with a spherical nose cylindrical projectile of diameter 9.5 mm of mass 7.6 g. The energy absorbed by the laminates when sub
Lat. Am. j. solids struct.. Publicado em: 2015-12
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10. Modeling of concrete dwellings based on results from ambient vibration tests
Based on both ambient vibration measurements and numerical models using the wide-column analogy and the finite element method, vibrations periods of low-rise concrete dwellings are estimated in this study. A brief review of parametric and nonparametric techniques is presented and discussed, and in-situ measurements techniques are critically compared. The res
Lat. Am. j. solids struct.. Publicado em: 2014-05
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11. Analysis of the flexural mode response of a novel trimaran by segmented model test
A novel ship concept design is significantly an "adhoc" process. In the preliminary design stage of novel vessels, it is very important to be able to develop an initial estimate of the effects of stiffness and mass distribution on the longitudinal flexural natural frequencies due to different general arrangements in still water at zero speed to satisfy desig
Lat. Am. j. solids struct.. Publicado em: 2014
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12. FLEXIBLE RISERS MONITORING TECHNIQUE BASED ON VIBRATION MEASUREMENTS / MONITORAMENTO DE RISERS FLEXÍVEIS ATRAVÉS DE TÉCNICA BASEADA EM VIBRAÇÕES
The main failure in flexible risers is the disruption of the wires from the tensile armor layer. Experience has shown that this class of damage occurs primarily near to the top riser connector. The breaking of the wires occurs gradually and may be caused by different processes as corrosion by inflow of fluid in the annular space, excessive wear associated wi
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 12/04/2012