304 research outputs found
Clock pulse modulation for ripple reduction in buck-converter circuits
DC-DC switching converters which are frequently treated as hybrid dynamical systems exhibit complex behavior due to nonlinear and interrupt characteristics. For synchronous buck-converters, we propose a method to control chaotic behavior by pulse-frequency modulation. An input voltage, a duty ratio of PWMs, and so on, affect to the regulation characteristics of converters directly, but a frequency of PWMs is determined by the frequency characteristics of the converter and is set as a fixed value. The proposed chaos-control method suppresses chaotic responses by slightly perturbing the pulse frequency alone, therefore our method can stabilize unstable periodic orbits without influence on the voltage regulation scheme. To simplify the feedback controller, the condition of dimension reduction for the controlling gain vector is derived. The proposed controller acheves the stabilization without a current sensor. Numerical simulation and circuit implementation demonstrate the validity of this method
Studies on the grading of fruit maturity by specific gravity in the determinate varieties of processing tomatoes : (I) Changes of specific gravity with advances of fruit maturity
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A general method to stabilize unstable periodic orbits for switched dynamical systems with a periodically moving threshold
In the previous study, a method to control chaos for switched dynamical systems with constant threshold value has been proposed. In this paper, we extend this method to the systems including a periodically moving threshold. The main control scheme is based on the pole placement, then a small control perturbation added to the moving threshold value can stabilize an unstable periodic orbit embedded within a chaotic attractor. For an arbitrary periodic function of the threshold movement, we mathematically derive the variational equations, the state feedback parameters, and a control gain by composing a suitable Poincare map. As examples, we illustrate control implementations for systems with thresholds whose movement waveforms are sinusoidal and sawtooth-shape, and unstable one and two periodic orbits in each circuit are stabilized in numerical and circuit experiments. In these experiments, we confirm enough convergence of the control input
Effects of Accelerated or Delayed Ripening on Hardness, Sugar Content and Acidity of Bananas
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Vibrating Acceleration of Cartons in the Truck Transport of Fruits
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Changes of Respiration Rate in Several Kinds of Vegetables under Fluctuating Temperatures
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Ripening Characteristics of 'Latundan' Bananas (Musa AAB group) Imported from the Philippines
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Wilting Tolerance of the Cut Flowers in Chrysanthemum and Carnation
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Sugar and Organic Acid Contents in the Strawberry Fruit under Different Cultivating Conditions
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Changes in Fruit Temperature and Air Constituents in Corrugated Carton by Vibration
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