Acceleration Mechanical
Mostrando 1-12 de 33 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. Experimental Evaluation of Low-Pass Shock Isolation Performance of Elastomers Using Frequency-Based Kolsky Bar Analyses
Abstract Elastomeric materials are used as shock isolation materials in a variety of environments to dampen vibrations and/or absorb energy from external impact for minimizing energy transfer between two objects or bodies. Some applications require the shock isolation materials to behave as a low-pass mechanical filter to mitigate the shock/impact at high fr
Lat. Am. j. solids struct.. Publicado em: 2017-03
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3. Electromyographic analysis of riding posture during the bicycling start moment
Abstract Professional cyclists often adopt a competition-start standing posture, which has been shown to improve performance. The biomechanical basis of this is unclear, and might be due to a greater mechanical advantage or increased key muscle activity. Previous observations in steady state cycling showed greater activation of the tibialis anterior, erector
Motriz: rev. educ. fis.. Publicado em: 2016-12
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4. Crashworthiness Analysis and Evaluation of Fuselage Section with Sub-floor Composite Sinusoidal Specimens
Abstract Crashworthiness is one of the main concerns in civil aviation safety particularly with regard to the increasing ratio of carbon fiber reinforced plastic (CFRP) in aircraft primary structures. In order to generate dates for model validations, the mechanical properties of T700/3234 were obtained by material performance tests, and energy-absorbing resu
Lat. Am. j. solids struct.. Publicado em: 2016-06
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5. Muscular performance characterization in athletes: a new perspective on isokinetic variables
Background: Isokinetic dynamometry allows the measurement of several variables related to muscular performance, many of which are seldom used, while others are redundantly applied to the characterization of muscle function. Objectives: The present study aimed to establish the particular features of muscle function that are captured by the variables currentl
Braz. J. Phys. Ther.. Publicado em: 10/10/2014
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6. In vitro biomineralization of a novel hydroxyapatite/superhydrophilic multiwalled carbon nanotube nanocomposite using simulated body fluids
Nanobiomaterials based on superhydrophilic vertically-aligned multi-walled carbon nanotubes (VAMWCNT-O2) are promising for their properties and bone tissue biocompatibility. VAMWCNT-O2 films with nanohydroxyapatite (nHAp) aim to improve mechanical properties and biocompatibility of this new nanocomposite due to its resemblance to bone matrix structure. This
Mat. Res.. Publicado em: 08/03/2013
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7. Desenvolvimento de uma centrífuga de alta rotação eletronicamente monitorada para pesquisa em biologia espacial
This work presents the development of an centrifuge prototype for experiments with vegetables. Its main features are the high mechanical performance and instruments. In more details are presented the specification, implementation, validation and performance assessment through a case study. Its high speed and stability generates a vector component of centrifu
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/03/2012
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8. Sistema embarcado para monitoramento do conforto em transporte público / Embedded system to monitoring the comfort in public transportation
Este trabalho descreve o desenvolvimento, projeto e aplicação de um sistema de medição embarcado destinado à avaliação de conforto do usuário do transporte público. O hardware deste sistema é dotado de acelerômetro triaxial e sistema de posicionamento global (GPS). Três algoritmos, desenvolvidos especialmente para este sistema, foram utilizados p
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 23/11/2011
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9. Modelagem da dinâmica vertical de coxins elastoméricos de motor através de método de redes neurais / Modeling vertical dynamic of elastomeric engine mounts using artificial neural networks
This dissertation scope is the modeling of an elastomeric mount, element which has primordial role on powertrain vibration isolation. The study of the mechanic behavior of those elastomeric materials is a field being studied for several years agor since its complexity and non-linarity of those components; and a reliable math models are competitive edge. So t
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 03/10/2011
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10. Controle da velocidade e da direção entre dois veículos agrícolas / Speed and steering control between two agricultural vehicles
One problems of the mechanical harvest of sugar cane is the lack of synchronization between the harvester and field wagon. This problem can causes crop losses as well as reducing operational capacity. The first occurs when the machines are misaligned and part of the sugar cane is thrown out of the wagon. The operational capacity reduce occurring when the mac
Publicado em: 2011
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11. Algoritmo para frenagem regenerativa de uma máquina síncrona de imã permanente / Algorithm for regenerative braking of a permanent magnet synchronous machine
Environmental protection and optimal energy resources are great activity research areas. As a result of these researches, electric vehicles (EVs) and hybrid (HEV) developments have been accelerated. They have challenging problems such as low autonomy, power conversion, vehicle control, energy management and distribution within it, as well as the esthetic and
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 02/08/2010
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12. 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