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Recently, the need for autonomous or highly functional agricultural equipment has increased because of fewer and aging laborers involved in farming. Vehicles are used to pull trailers when picking fruits in an orchard. It has to be driven in reverse when being parked in a garage and when changing its course to prevent it from running into people or other such obstacles. However, precise control of...
Various kinds of austenitic stainless steel have been used in oil refineries and chemical plants, and a value of ultrasonic wave velocity is necessary for not only thickness measurement but also evaluation of material deterioration. Although ultrasonic wave velocity depends generally on chemical composition, material structure, grain size, etc., it is hard to study the influence of all factors for...
In cyber-physical systems, computing resources are often limited and overload situations may occur. For overload avoidance, job skipping is a useful and simple method. However, job skipping causes a state estimation error of a dynamic observer in an output-feedback controller. In this paper, we propose a modified observer so as to reduce it and maintain a control performance.
We consider cyber-physical systems where several physical plants are controlled by digital controllers implemented as periodic tasks executing in one embedded computer. If overload situations occur, control performances of the controlled plants may degrade seriously. We introduce an arbiter which accepts or drops jobs released by the tasks to avoid the overload situations. We consider a cost function...
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