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The downhole directional steering system captures mechanical connections and interactions between different parts. Due to the spatial delays, parametric uncertainties and modeling inaccuracies in the system, the closed-loop stability and robust performance are challenging problems to address. Towards this goal, the current paper presents an ℒ1 adaptive controller which drives the output of the system,...
This paper puts forward a adaptive face detection algorithm. First face is choosed by the adaptive skin color model and eyebrow and eyes are located by integral projection. Then coordinates of eye center are confirmed by the method which makes use of mixed round and elliptic based on hough transform. Finally, face is detected by the human eye center mapping. The experimental results show that the...
Positive systems represent a class of systems whose state variables are nonnegative. This paper presents an ℒ1 adaptive controller for such systems. The control objective is to force the system output track a given nonnegative reference signal. In the analysis of the ℒ1 adaptive controller, we first show the positivity of the constructed reference system, and then demonstrate that the controlled system...
This paper studies the tracking problem of an uncertain LTI system where both the control input and system state are quantized. The ℒ1 adaptive controller is designed for the quantized system. Two common types of quantization, logarithmic and uniform, quantization are considered. In both cases, the analysis of the closed-loop system provides a uniform transient performance bound, which depends on...
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