Vibration Mechanics
Mostrando 1-12 de 16 artigos, teses e dissertações.
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1. Intermittent vibrations accelerate fracture healing in sheep
Abstract Purpose: To investigate the effect of intermittent vibration at different intervals on bone fracture healing and optimize the vibration interval. Methods: Ninety sheep were randomized to receive no treatment (the control group), incision only (the sham control group), internal fixation with or without metatarsal fracture (the internal fixation gro
Acta Cir. Bras.. Publicado em: 12/09/2019
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2. Effect of Open Crack on Vibration Behavior of a Fluid-Conveying Pipe Embedded in a Visco-Elastic Medium
Abstract In this paper vibration behavior of a fluid-conveying cracked pipe surrounded by a visco-elastic medium has been considered. During this work, the effect of an open crack parameters and flow velocity profile shape inside the pipe on natural frequency and critical flow velocity of the system has been analytically investigated. An explicit function fo
Lat. Am. j. solids struct.. Publicado em: 2016-01
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3. Investigação experimental e analítica do escoamento ao redor de cilindro circular com supressores de VIV. / Experimental and analytical investigation of the flow around circular cylinder with VIV suppressors.
The fluid flow around bluff bodies is one of the main problems in fluid mechanics. The investigations of this phenomenon are based on analytical, numerical and experimental techniques. Each technique presents advantages and disadvantages, being impossible the comprehensive characterization of the flow though only one technique for the majority of body geomet
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/09/2011
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4. NONLINEAR DYNAMICS, INSTABILITY AND CONTROL OF STRUCTURAL SYSTEMS WITH MODAL INTERACTION / DINÂMICA NÃO-LINEAR, INSTABILIDADE E CONTROLE DE SISTEMAS ESTRUTURAIS COM INTERAÇÃO MODAL
The aim of this thesis is to study the influence of coupled buckling modes on the static and particularly on the nonlinear dynamic behavior of structural components liable to buckling. For this, two discrete two degrees of freedom models known for their complex nonlinear behavior are selected: the well-known Augusti¿s model and a simplified model of cable-s
Publicado em: 2010
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5. Estudo da fluência em vigas de concreto reforçado com fibras de aço, com aplicação de conceitos da mecânica da fratura / Creep analysis of steel fiber reinforced concrete based on beam tests and fracture mechanics concepts
Despite of the well known advantages of steel fiber addition to concrete (SFRC), especially the toughness improvement, only a few number of studies has been developed about creep on these composites. The main purpose of this research is to investigate the feasibility and inherent difficulties related to a particular creep evaluation method. This method is ba
Publicado em: 2008
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6. Análise por elementos finitos da influência de descontinuidades geométricas sobre o comportamento dinâmico de rotores flexíveis.
This work deals with a finite element analysis of the dynamic behavior of cracked flexible rotors supported by hydrodynamic journal bearing. Geometric discontinuities such as cracks, holes, undercuts, etc. can strongly affect the vibrational response of rotating systems due to the rotor local flexibility changes. The rotor model is based on the Timoshenko be
Publicado em: 2007
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7. Estudo da classificação não-destrutiva de peças serradas de espécies cultivadas no Brasil para uso em estruturas. / Study of nondestructive classification of sawed parts of cultivated species in Brazil for use in structures
Este trabalho teve por finalidade verificar a acuracidade das técnicas de ultra-som e vibração transversal comparativamente aos valores obtidos em ensaios estáticos, para madeira serrada empregada em estruturas. Com os resultados obtidos no desenvolvimento deste trabalho foi possível calibrar o coeficiente de modificação (kmod,3) da NBR 7190:1997 - Pr
Publicado em: 2007
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8. Estudo de algoritmo de continuação aplicado a resposta não-linear em frequência / Study of path-following algorithm applied non-linear response frequency
O objetivo deste trabalho é estudar a aplicação do método "arc-length" em funções de resposta em frequência não-lineares (RFs), para se obter principalmente regiões instáveis do caminho de equilíbrio da curva de receptância ?(?). Para isto, é necessário conhecer os vários procedimentos de continuação existentes com o intuito de se escolher o
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/07/2005
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9. Moire assisted vibrational analysis of a cantelever beam : a case study / Analise vibracional de viga engastada utilizando a tecnica de moire : um estudo de caso
Vibration phenomena are of common occurrence in mechanics, generally associated to structural members as well as to machine elements. Particularly, in the field of agricultural engineering, vibration comes also associated to vegetable bruising during field operations, which clearly includes harvesting, transportation and processing. The selection of a simple
Publicado em: 2005
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10. Identification of elastic parameters on thin plates of composite materials / Identificação de parametros elasticos em placas finas de materiais compositos
In this work two methods are analyzed to identify elastic constants in composite materiais of structural application. They are methods that have nondestructive eharacteristie, comprised of simple tests and don t require high computational efforts. They can be employed to anisotropic materials as well as isotropic or ortotropic materials, making them useful a
Publicado em: 2005
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11. Analise numerica e experimental do indice de vibro-impacto em alavancas de transmissão mecanica / Numerical and experimental vibro-impact level analysis in mechanical gearshift levers
Este trabalho apresenta a análise numérica e experimental do índice de vibro-impacto em alavancas de transmissão mecânica. Foram desenvolvidos modelos de alavanca que consideram não-linearidades na estrutura. Métodos para quantificação do vibro-impacto foram obtidos na literatura e implementados para o levantamento de curvas, as quais indicam a vari
Publicado em: 2005
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12. Influencia da vibração na permeabilidade absoluta de meios porosos saturados com agua / Influence of the vibration on the absolute permeability of porous media satured with water
This work verifies experimentally the effects of the mechanical vibration on the absolute permeability of saturated porous media upon which a uniform flow is simultaneously imposed. After finding a driving range within which indirect effects of the vibration are excluded, such as those resulting from ultrasonic heating and mechanical disintegration of the ro
Publicado em: 2004