Browsing by Issue Date, starting with "2008-02"
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- Research issues in biological inspired flying robotsPublication . Silva, Manuel; Tenreiro Machado, J. A.Biological inspired locomotion robotics is an area reveal-ing an increasing research and development. In spite of all the recent engineering advances, robots lack capabilities with respect to agility, adaptability, intelligent sensing, fault-tolerance, stealth, and utilization of in-situ power resources compared to some of the simplest biological organisms. The general premise of bio-inspired engineer-ing is to distill the principles incorporated in successful, nature-tested mechanisms, capturing the biomechatronic designs and minimalist operation principles from nature’s success strategies. Based on these concepts, several robots that adopt the same locomotion principles as animals, like legs for walking, fins for swimming, segmented body for creeping and peristaltic movements for worm like loco-motion, were developed in the last years. Recently, flap-ping wings robots are also stating to make their debut but there are several problems that need to be solved before they may fly autonomously. This paper analyses the ma-jor developments in this area and the directions towards future research.
- Research issues in biological inspired sensors for flying robotsPublication . Silva, Manuel; Tenreiro Machado, J. A.; Jesus, Isabel S.Biological inspired robotics is an area experiencing an increasing research and development. In spite of all the recent engineering advances, robots still lack capabilities with respect to agility, adaptability, intelligent sensing, fault-tolerance, stealth, and utilization of in-situ resources for power when compared to biological organisms. The general premise of bio-inspired engineering is to distill the principles incorporated in successful, nature-tested mechanisms of selected features and functional behaviors that can be captured through biomechatronic designs and minimalist operation principles from nature success strategies. Based on these concepts, robotics researchers are interested in gaining an understanding of the sensory aspects that would be required to mimic nature design with engineering solutions. In this paper are analysed developments in this area and the research aspects that have to be further studied are discussed.
- Fractional order capacitorsPublication . Jesus, Isabel S.; Tenreiro Machado, J. A.; Silva, ManuelThe performance of electrical devices, depending on the processes of the electrolytes, have been fully described and the physical origin of each parameter is well established. However, the influence of the irregularity of the electrodes was not a subject of study and only recently, this problem became relevant in the viewpoint of fractional calculus. This paper describes an electrolytic process in the perspective of fractional order capacitors. In this line of thought, are developed several experiments for measuring the electrical impedance of the devices. The results are analyzed through the frequency response, revealing capacitances of fractional order that can constitute an alternative to the classical integer order elements.