Faults Detect
Mostrando 13-22 de 22 artigos, teses e dissertações.
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13. Sistema especialista para detecção de falhas em comandos elétricos
This work consists of the creation of a Specialist System which utilizes production rules to detect inadequacies in the command circuits of an operation system and commands of electric engines known as Direct Start. Jointly, three other modules are developed: one for the simulation of the commands diagram, one for the simulation of faults and another one for
Publicado em: 2005
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14. Caracterização macro, meso e microscópica das estruturas frágeis do corpo arenítico conglomerático da região de Santana do Acaraú (CE) e seu embasamento circundante
The structural framework of the sedimentary basins usually plays an important role in oil prospects and reservoirs. Geometry, interconectivity and density of the brittle features developed during basin evolution could change the permo-porous character of the rocks involved in generation, migration and entrapment of fluid flow. Once the structural characteriz
Publicado em: 2005
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15. Measurement processing for state estimation and fault identification in batch fermentations
This work describes an application of maximum likelihood identification and statistical detection techniques for determining the presence and nature of abnormal behaviors in batch fermentations. By appropriately organizing these established techniques, a novel algorithm that is able to detect and isolate faults in nonlinear and uncertain processes was develo
Brazilian Journal of Chemical Engineering. Publicado em: 2004-09
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16. Desenvolvimento de um modelo de gerenciamento de redes de telecomunicações utilizando a plataforma CORBA
The network management is a task very important to its operation, mainly in telecommunication networks. This fact is caused by increasing of size and complexity of the networks which raises difficulties to detect faults and low performance. Other important fact in network management is the decentralization of the managers, so in case of faults there will be
Publicado em: 2001
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17. Detecção e diagnostico de falhas em sistemas de processos quimicos. Importancia do conhecimento de estados intermediarios de processos dinamicos. Desenvolvimento de uma metodologia baseada em redes neurais
Artificial Neural Networks (ANN) have demonstrated excellent performance in automatic fault detection and diagnosis in many engineering applications. The great problem when using neural networks, is that neural networks perform only as robustly as the data from which they are trained. This means that is necessary to use as much data as possible in order to c
Publicado em: 2000
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18. Fault detection and diagnosis in robotic manipulators via artificial neural networks. / Detecção e diagnóstico de falhas em robôs manipuladores via redes neurais artificiais.
In this work, a new approach for fault detection and diagnosis in robotic manipulators is presented. A faulty robot could cause serious damages and put in risk the people involved. Usually, researchers have proposed fault detection and diagnosis schemes based on the mathematical model of the system. However, modeling errors could obscure the fault effects an
Publicado em: 1999
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19. Faults detection and isolation using reduced-order state observers / Detecção e localização de falhas via observadores de estado e de ordem reduzida
The development of new faults detection techniques is necessary because of increasing demands from industries on reliability and safety in mechanical systems. They must be supervised such that occurrence of failures can be accommodated as quickly as possible because they can cause an unacceptable deterioration of the systems performance. In this work, we hav
Publicado em: 1998
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20. Estrategias de detecção e diagnostico de falhas em sistemas dinamicos
Analytical redundancy for fault detection and diagnosis of dynamic systems, FDD, has been approached by several methodologies, state estimation, parameter estimation, expert systems, and pattern classification and recognition being typical examples. In particular, pattern classification and recognition methods adopt probabilistic, heuristic, neural, and fuzz
Publicado em: 1997
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21. Atomic force microscopy captures quantized plastic deformation in gold nanowires
Scanning probe microscopy has become a powerful tool to detect structural changes in small clusters of atoms. Herein, we use an atomic force microscope to measure the length of gold nanowire structures during extension and compression cycles. We have found that nanowires elongate under force in quantized steps of up to three integer multiples of 1.76 Å and
National Academy of Sciences.
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22. Radiation-induced mutations at mouse hemoglobin loci.
In experiments designed to detect new mutations affecting hemoglobin, we irradiated the male or female parent in reciprocal crosses of two mouse strains that differ in alleles at the hemoglobin (Hba, Hbb) loci as well as at five other specific loci. Offspring were analyzed for hemoglobin properties (electrophoretic pattern, solubility, crystal pattern), seru