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A free-piston engine linear generator system is investigated for use as a high-efficiency generator engine. The system's efficiency depends on its generation and thermal efficiency, and the generation efficiency is degraded at the edge of the expansion stroke when the piston speed is low and the thrust is high. The generation efficiency is thereby improved to 97% using machine coupling control. Furthermore,...
Carrier mobilities in polymeric insulators strongly depend on the morphology of the system. In this study, in order to achieve a comprehensive understanding of hole transfer in PE, we evaluate the hole mobility in amorphous polyethylene (PE) without any ad hoc parameters. We developed a multi-scale computational approach that consists of molecular dynamics simulations, quantum chemical calculations,...
This paper describes one of the most important issues for mobile robots: it is simultaneous optimization of robot structures and its control systems using evolutionary algorithm and dynamics simulation. Generally, wheeled mobile robots have difficulty in traveling on the outdoor environments because of its mechanical limitations. And, the effective outdoor traveling has deeply relationship between...
Various mobile mechanisms have been developed combining linkage mechanisms and wheels, and the combination of passive linkage mechanisms and small wheels is one of research trends to enhance the mobility on irregular terrain. We have been working on a 6-wheeled mobile robot employing a passive linkage mechanism, which achieved climbing capability over a 0.20[m] height of bump and stairs, and developed...
Recently, various mechanisms have been developed combining linkage mechanisms and wheels, especially, the combination of passive linkage mechanisms and small wheels is one of main research trends, because standard wheel type mobile mechanisms have difficulties on rough terrain movements. In our research, a 6-wheeled mobile robot employing a passive linkage mechanism has been developed to enhance maneuverability...
A wheeled mobile mechanism with a passive and/or active linkage mechanism for rough terrain environment is developed and evaluated. In our previous research, we developed a switching controller system for wheeled mobile robots in rough terrain. This system consists of two sub-systems: an environment recognition system using self-organizing map (SOM) and an adjustable control system using neural network...
The interlayer exchange coupling strength of 80Ni-Fe/Cu multilayer films prepared on a glass substrate by magnetron sputtering was studied by ferromagnetic resonance. The exchange coupling strength was evaluated by assuming a weak perpendicular magnetic anisotropy and fitting the data of the resonance fields and peak intensities. It exhibited a broad peak when the Cu thickness was 10.8??, and increased...
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