Método para gerenciamento do consumo de energia elétrica em sistemas ciberfísicos

Tese (doutorado) - Universidade Federal de Santa Catarina, Centro Tecnológico, Programa de Pós-Graduação em Engenharia de Automação e Sistemas, Florianópolis, 2013.Abstract : Each day the number of devices or systems with some level of processing is greater. This point has contributed to areas with little or no affinity to set an emerging class of systems: the Cyber-Physical Systems (CPS). They are systems in which the computational core is integrated into the physical, biological and engineering processes; so new capabilities can be integrated to them. These systems are formed by different components and most of them are powered by batteries, because of this they have different energy profiles. The finite nature of the battery capacity is a crucial aspect to the system performance because it interferes directly on the quantity, quality and durability of its features. Thus, the usage of technique s which provide the means for managing the power consumption becomes an essential requirement in energy-aware designs. Therefore, this thesis proposes a set of integrated actions that are performed via software. The purpose is to realize a management of the power consumption in CPSs that are batterypowered. The approach uses an energy consumption mathematical model which defined by an operation mode. The operation mode encapsulates the energy consumption of external peripherals, that are controlled by an embedded software, into the CPS. Thus, the active states of the system are characterized by computational tasks, used to perform the energy consumption profile. In this way, it is possible to estimate the battery life, which is used as a reference for setting the system demand. A CPS scenario was used to validate the approach which was characterized by a mobile robotic system. Some targeted experiments have been developed in order to measure the currents drawn by the robot peripherals and also by the computer system during its operation. The results have been compared with the estimated values using the proposed approach. This analysis confirms the validity of the hypothesis: there is a close relationship between the computer system and electromechanical devices, that is, the devices activation is related to the type of computational task performed by the system. Based on that, the considerations underlying the proposal are presented and they go toward the validation of the model and the feasibility of the developed approach. Finally, the contributions and limitations of the research, as well as the suggestions for a future work are related