Parameter Uncertainties
Mostrando 1-12 de 39 artigos, teses e dissertações.
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1. Soil physical and hydraulic properties in the Donato stream basin, RS, Brazil. Part 2: Geostatistical simulation
RESUMO A simulação geoestatística tem sido a técnica mais promissora e utilizada para a análise de incertezas de propriedades físico-hidráulicas do solo com grande heterogeneidade espacial. Este estudo realizou uma análise estocástica da condutividade hidráulica saturada (Ksat) e dos parâmetros da curva de retenção de água no solo na bacia do a
Rev. bras. eng. agríc. ambient.. Publicado em: 12/08/2019
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2. Sensitivity Analysis of Flexible Rotor Subjected to Interval Uncertainties
Abstract This paper aims at analyzing the sensitivity of the structural response of flexible rotors subjected to uncertain interval parameters. The interval approach encompasses both an uncertainty and sensitivity analyses. The uncertainty analysis consists in computing the interval uncertain structural responses by using the global optimization method. The
Lat. Am. j. solids struct.. Publicado em: 13/05/2019
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3. Incertezas na simulação hidrológica em pequenas bacias por meio do modelo SWAT
ABSTRACT Hydrological modelling is one of the main tools in water resources management application. However, several factors make it difficult to extrapolate the estimated parameters in basins with large contribution areas to smaller basins. This research analysed the uncertainties of flow simulations in small basins. The methodological process involves the
RBRH. Publicado em: 08/11/2018
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4. Simple but not simpler: a systematic review of Markov models for economic evaluation of cervical cancer screening
The aim of this study was to critically evaluate the quality of the models used in economic evaluations of screening strategies for cervical cancer prevention. We systematically searched multiple databases, selecting model-based full economic evaluations (cost-effectiveness analyses, cost-utility analyses, and cost-benefit analyses) of cervical cancer screen
Clinics. Publicado em: 10/07/2018
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5. Control of a Support Excitation Smart Beam Subjected to a Follower Force with Piezoelectric Sensors/Actuators
Abstract In this paper, an active control is used to suppress the flutter vibration of a support excitation beam subjected to a follower force, using piezoelectric sensors/actuators. The beam is fixed to a motion support from one end and the other end is subjected to a follower force. The governing equations of motion are derived based on the generalized fun
Lat. Am. j. solids struct.. Publicado em: 2015-12
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6. Effect of Surface Stress on the Buckling of Nonlocal Nanoplates Subject to Material Uncertainty
Abstract At the nano scale, the effect of surface stress becomes prominent as well as the so-called small scale effect. Furthermore due to difficulties in making accurate measurements at nano-scale as well as due to due to molecular defects and manufacturing tolerances, there exists a certain degree of uncertainty in the determination of the material propert
Lat. Am. j. solids struct.. Publicado em: 2015-09
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7. Vibration suppression of a rotating flexible cantilever pipe conveying fluid using piezoelectric layers
AbstractIn this study, the governing equations of a rotating cantilever pipe conveying fluid are derived and the longitudinal and lateral induced vibrations are controlled. The pipe considered as an Euler Bernoulli beam with tip mass which piezoelectric layers attached both side of it as sensors and actuators. The follower force due to the fluid discharge ca
Lat. Am. j. solids struct.. Publicado em: 2015-06
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8. Avaliação estatística do erro de modelos de resistência para elementos lineares de concreto armado da ABNT NBR 6118:2007 / Statistical evaluation of resistance modelling error for linear elements of concrete structures of ABNT NBR 6118:2007
In a design of structures, it should be considered the intrinsic uncertainties to the present variables in the structure and in the structural concept, such as intensity and action distribution, mechanic properties of the material, geometric parameters of the structure and structural analysis and calculus models. Thus, the structural safety can only be measu
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 03/08/2012
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9. Multiobjective engineering design optimization problems: a sensitivity analysis approach
This paper proposes two new approaches for the sensitivity analysis of multiobjective design optimization problems whose performance functions are highly susceptible to small variations in the design variables and/or design environment parameters. In both methods, the less sensitive design alternatives are preferred over others during the multiobjective opti
Pesqui. Oper.. Publicado em: 04/12/2012
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10. Statistical analysis of acoustic emission signals generated during turning of a metal matrix composite
Acoustic emission technique (AET) has been used to monitor the progress of tool wear during turning of silicon carbide (20 wt.%) dispersed Al alloy metal matrix composite. Acoustic emission (AE) signals generated beyond a specific cutting distance increase abruptly. Statistical analysis based on assumed β distribution of AE energy showed that skewness and k
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2012-06
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11. Influence of a diagonal pre-drilled hole on hole quality during the reaming process using multiblade tools
The requirements of production engineering for a precision hole are to ensure the required quality as well as minimal production costs. The interactions between machine, tool and the pre-drilled hole result in uncertainties during the final reaming process. For this purpose the reaming process itself and the appearance of process faults were focused in a lar
J. Braz. Soc. Mech. Sci. & Eng.. Publicado em: 2012
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12. MODEL REFERENCE ADPATIVE CONTROL APPLIED TO THE SPEED AND POSITION CONTROL OF PERMANENT MAGNET SYNCHRONOUS MOTORS / CONTROLE ADAPTATIVO ROBUSTO POR MODELO DE REFERÊNCIA APLICADO AO CONTROLE DE VELOCIDADE E DE POSIÇÃO DE MOTORES SÍNCRONOS A ÍMÃS PERMANENTES
Este trabalho propõe duas estratégias de controle vetorial para motores síncronos a ímãs permanentes (MSIPs). Destinam-se ao controle de velocidade e de posição, respectivamente, e são baseados em uma lei de controle chamada VS-RMRAC. Não tendo sido aplicado ainda ao controle de máquinas elétricas, a lei de controle VS-RMRAC apresenta característ
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/08/2011