Stability Margins
Mostrando 1-12 de 22 artigos, teses e dissertações.
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1. Trifecta achievement in patients undergoing partial nephrectomy: a systematic review and meta-analysis of predictive factors
ABSTRACT Purpose The predictors of trifecta achievement in partial nephrectomy (PN) were poorly inquired and remained a controversial area of discovery. To evaluate predictive factors of trifecta achievement in patients undergoing PN. Materials and Methods A systematic literature search was performed to identify relevant articles. Only studies focusing o
International braz j urol. Publicado em: 2022
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2. Synovial Sarcoma in Head and Neck: A Case Report
Introduction Synovial sarcoma is a malignant tumor of mesenchymal pluripotent cells. Objectives We present a case of synovial sarcoma in the posterolateral wall of the oropharynx. Resumed report The patient, a 23-year-old woman, was admitted with a history of dysphagia and difficulty in breathing for 8 months, resulting in progressive deteriora
Int. Arch. Otorhinolaryngol.. Publicado em: 2014-01
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3. A Sensitivity Investigation on the Aeroelastic Dynamic Stability of Slender Spinning Sounding Rockets
ABSTRACT: The present work addresses a sensitivity analysis investigation of the aeroelastic stability margins for the VSB-30 sounding rocket during the atmospheric flight phase. Parametric stability analyses are performed considering variations of the inertia properties of the modular payload. Such variations can be caused by different type and/or number of
J. Aerosp. Technol. Manag.. Publicado em: 2013-03
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4. Robustness margins for indirect field-oriented control of induction motors
The influence of the rotor time constant mismatch on the stability of induction motors under indirect field-oriented control is analyzed. The results of [14] are generalized. A Lyapunov function which provides a global stability test and allows us to compute robustness margins is given. Different mechanisms for the loss of stability are detected by means of
Publicado em: 2011
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5. Robustness of global asymptotic stability in indirect field-oriented control of induction motors
The influence of the rotor time constant mismatch on the global stability of induction motors under indirect field oriented control (IFOC) is analyzed. A test for global stability is provided, based on necessary and sufficient conditions for the existence of quadratic Lyapunov functions for IFOC drives. This test yields robustness margins with respect to rot
Publicado em: 2011
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6. Tuning of multivariable decentralized controllers through the ultimate-point method
A successful method for tuning single-loop PID controllers is the ultimate-point method. This method is based on the identification of the ultimate point of the process’ frequency response followed by its shifting, through appropriate choices of the controller’s parameters, to a specified location of the complex plane. This paper presents an extension of
Publicado em: 2011
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7. AVALIAÇÃO E REFORÇO DAS CONDIÇÕES DE ESTABILIDADE DE TENSÃO EM BARRAS DE TENSÃO CONTROLADA POR GERADORES E COMPENSADORES SÍNCRONOS / VOLTAGE STABILITY ASSESSMENT AND ENHANCEMENT IN VOLTAGE-CONTROLLED BUSES BY SYNCHRONOUS GENERATORS AND COMPENSATORS
After the incidence of some voltage collapses in the energy transmission systems in the world, the voltage security became an issue of great interest in the last years due to the importance of its impact. The phenomenon of voltage stability is due to the excessive active and reactive power flow in the electrical transmission network and has been associated w
Publicado em: 2009
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8. Computation of voltage stability margins of distribution systems / Calculo da margem de segurança de estabilidade de tensão de sistemas de distribuição de energia eletrica
Neste trabalho de pesquisa propõe-se uma ferramenta flexível para o Cálculo da margem de segurança de redes de distribuição de energia elétrica com relação à estabilidade e de tensão. Esta margem de segurança está relacionada à distância (em termos da carga)entre o ponto de operação atual e o ponto de operação correspondente à máxima car
Publicado em: 2008
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9. AVALIAÇÃO DA SEGURANÇA DA OPERAÇÃO DE SISTEMAS ELÉTRICOS DE POTÊNCIA CONSIDERANDO OS LIMITES DE ESTABILIDADE ANGULAR E DE TENSÃO / OPERATION SECURITY ASSESSMENT OF ELECTRIC POWER SYSTEMS BY CONSIDERING THE ANGLE AND VOLTAGE STABILITY LIMITS
Este trabalho apresenta novos métodos analíticos e computacionais para a avaliação da segurança da operação de sistemas elétricos de potência considerando os Limites de Estabilidade Angular e de Tensão. No tema Estabilidade Angular, desenvolveu-se um método para a estimativa de margens de segurança transitória baseado em técnicas de redução d
Publicado em: 2008
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10. Perfis pultrudados de plástico reforçado com fibra de vidro aplicados à estrutura de um banco de capacitores de subestação de energia elétrica
In this work, an alternative capacitor bank framed structure was designed using glass fiber reinforced polymer (GFRP) pultruded bars. A finite element model was developed to simulate the structure static behavior and stability. Material properties were evaluated by a characterization test program. A prototype of the structure was built, instrumented and test
Publicado em: 2007
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11. Computation of voltage stability margins of power systems / Obtenção da margem minima de estabilidade de tensão de sistemas eletricos de potencia
This work presents a new and fast method for computing the minimum voltage stability margin of electric power systems. The computation of the voltage stability margin (VSM) is often required for the planning and operation of power systems. Usually, loads are increased along a predefined direction, which can be estimated based on historical data or load forec
Publicado em: 2007
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12. CALCULATION OF SECURITY INDEXES IN POWER SYSTEMS BASED ON TIME DOMAIN SIMULATION / CÁLCULO DE ÍNDICES DE SEGURANÇA EM SISTEMAS DE ENERGIA ELÉTRICA BASEADO EM SIMULAÇÃO NO DOMÍNIO DO TEMPO
Power systems have been operating nowadays near to the stability limits putting security under risk. This is one of the reasons why the dynamic security assessment is a fundamental tool to avoid the occurrence of blackouts in the whole world. The goal is a reliable and fast way to evaluate the dynamic behavior of a power system. This dissertation deals with
Publicado em: 2006