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Maintenance costs of a pitch control device of a wind turbine
Carvalho, Mariana; Nunes, Eusébio P.; Telhada, JoséAlthough the wind turbines are nowadays the principal source of wind energy production, the technical information publicly known about these machines is still very scarce. Information related to failure modes, unavailability and maintenance costs of these systems remain confidential and only the manufacturer has knowledge about them. To be able to optimize the efficiency, to guarantee the security and to negoti...
Maintenance decision making
Carvalho, Mariana Teixeira Baptista de; Nunes, Eusébio P.; Telhada, JoséIn any management process, decision making assumes a very important dimension. Complex systems are commonly fed with large amounts of data that are quickly made available to experts and industrial engineers who, in most cases, are not provided with adequate decision support tools. Therefore, the quality of their decisions heavily relies on their our quality and experience, making the complex systems management ...
RAM factors in the operation and maintenance phase of wind turbines
Cajazeira, Carolina Leite Barbosa; Nunes, Eusébio P.; Telhada, José; Carvalho, Mariana Teixeira Baptista deThe high complexity of technological systems and the increasing requirement and competitiveness of markets request the implementation of adequate management strategies for these systems in order to improve their availability and productivity. In this context, RAM factors constitute a strategic approach for integrating reliability, availability and maintainability, by using methods, tools and engineering techniq...
Simulation approach for an integrated decision support system for demand respon...
Dias, Ana; Telhada, José; Carvalho, Maria SameiroRural areas are becoming more desert from day to day, leading to complex dispersed and scarce demand patterns for public transport. As a consequence, conventional transport services are becoming less frequent, reducing levels of service (e.g., low occupancy rates, usage of old vehicles). With rigid predefined routes and schedules, they are inappropriate to operate in such environments. Demand Responsive Transpo...
A decision support system for a flexible transport system
Dias, Ana; Telhada, José; Carvalho, Maria SameiroThe provision of traditional public transport services in rural areas have shown to be very inefficient and ineffective. In fact, rural areas are typically characterized by low levels of population density leading to complex demand patterns (low levels and high spatial and temporal dispersion), which in turn leads to low levels of service of conventional transport services (low frequencies, usage of old vehicle...
Economic evaluation of a demand responsive transport in rural areas
Dias, Ana; Telhada, José; Carvalho, Maria SameiroThe provision of traditional public transport services in rural areas have shown to be very inefficient and ineffective. In fact, rural areas are typically characterized by low levels population density leading to complex demand patterns (demand is low and spread over a large area) which leads to low levels of service of conventional transport services (low frequency, old vehicles, etc). Demand Responsive Trans...
A simulation approach to support the design of flexible transport systems
Dias, Ana; Telhada, José; Carvalho, Maria SameiroRural areas are characterized by low levels of population density and complex mobility patterns. Conventional transport services have shown to be very inefficient and ineffective in these environments and the provision of traditional public transport services in these areas presents, very often, low levels of service. In this context, an alternative solution - a Demand Responsive Transport (DRT) system - has al...
Decision support system for the design of sustainable demand responsive transport
Dias, Ana; Telhada, José; Carvalho, Maria SameiroThe provision of traditional public transport services in rural areas have shown to be very inefficient and ineffective. In fact, rural areas are naturally categorized by low levels of population density leading to complex demand patterns (low levels and high spatial and temporal dispersion), which leads to low levels of service of conventional transport services (low frequencies, usage of old vehicles, etc). D...
A cost-benefit analyis of an intelligence and demand-responsive public transpor...
Oliveira, Joaquim Vítor; Telhada, José; Ferreira, Paula VarandasThe current road public transport systems in Portugal are not suitable for most of its inhabitants, in particular those who suffer of reduced mobility. This inadequacy is mainly due to the lack of flexibility of the transport services provided and the poor level of physical accessibility (pathways and in-vehicle facilities). This study aims to estimate the effects of the implementation of public transportation ...
Outlining fuzzy decision making in maintenance planning
Carvalho, Mariana Teixeira Baptista de; Nunes, Eusébio P.; Telhada, JoséIn any management process, decision making assumes a very important dimension. Complex systems are commonly fed with large amounts of data that are quickly made available to experts and industrial engineers who, in most cases, are not provided with adequate decision support tools. Therefore, the quality of their decisions heavily relies on the quality and experience of them. Indeed, in general, such great avail...
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