RESUMO
The present report explores various approaches for controlling nonlinear uncertaim dynamical system. Several models representing different types of nonlinearities in such systems are considered. In particular, the Duffing oscillator and a system coupled to an electro-rheological device are considered. This latter system nonlinearity is characterized by a nonlinear force versus velocity relationship which is itself a function of an external voltage applied across the device. The control objectives considered in the present study consist of trajectory tracking (AU)
Assuntos
Engenharia , Códigos de Obras , Algoritmos , Sistemas Computacionais , Desenho Assistido por ComputadorRESUMO
Bridge design and construction are two of the most time consuming and expensive tasks of the Six-Year National Development Plan in Taiwan. Bridge construction engineering is the critical control job in freeway and highway construction. Reducing the design labor and time in the preliminary bridge design stage is important to ensure that the project is completed on time for freeway and highway construction and renovation. A related computer-aided design system called TBDS for freeway and highway bridges in Taiwan is introduced for this purpose. Both the domain experts' and knowledge engineers' experiences during the development of TBDS are described. Finally, the future directions of this research will be discussed.(AU)
Assuntos
Engenharia , Sistemas Computacionais , Desenho Assistido por Computador , TaiwanRESUMO
A pesar de contarse en la actualidad con buenos programas de analisis y diseño estructural, los ingenieros cuya especialidad es precisamente el diseño, tienden a desarrollar muchas veces sus propios programas para ajustarlos a su estilo y modalidad de trabajo. Generalmente estos programas constan de un archivo de datos y uno de resultados; lo cual hace tedioso tanto el ingresos de los datos como posteriormente la interpretación de los resultados. Entonces el programador moderno necesita incorporar ayudas gráficas a sus aplicaciones. Para ello debe contar con las herramientas adecuadas. El presente trabajo pretende ser un alcance a las posibilidades de incluir el manejo de información gráfica en los programas desarrollados (AU)