Louyue Zhang, Hehong Zhang, Chao Zhai, Gaoxi Xiao, Xi Wang, Zhihong Dan, Duoqi Shi
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Adaptive Tracking Differentiator with Feature Recognition for Signal Processing in High-Altitude Test Facilities
The ambient pressure is an important indicator for ensuring stable and efficient testing of the aeroengine in the high-altitude test (HAT) facilities. With the complex and quickly changing test environment and storage limitation of the underlying hardware, processing the pressure signals to access its filtering and differentiating signals to participate in designing feedback controller becomes difficult. The integration step of a differentiator algorithm, which is typically closely related to the sampling period, affects the performances of filtering and differentiating. In this work, a feature recognition based adaptive algorithm is proposed to enable the tracking differentiator (TD) by adaptively selecting an appropriate integration step in real-time. In particular, the sampled signals are transformed into images and analyzed by a proposed feature recognition algorithm. This algorithm can transform the real-time signals into an indice of system's dynamic characteristic. Simulation and experiment results show that the proposed adaptive TD algorithm can effectively improve the filtering and differentiating performances compared with the original TD, and meet the signal processing requirements of HAT facilities.
期刊介绍:
IET Control Theory & Applications is devoted to control systems in the broadest sense, covering new theoretical results and the applications of new and established control methods. Among the topics of interest are system modelling, identification and simulation, the analysis and design of control systems (including computer-aided design), and practical implementation. The scope encompasses technological, economic, physiological (biomedical) and other systems, including man-machine interfaces.
Most of the papers published deal with original work from industrial and government laboratories and universities, but subject reviews and tutorial expositions of current methods are welcomed. Correspondence discussing published papers is also welcomed.
Applications papers need not necessarily involve new theory. Papers which describe new realisations of established methods, or control techniques applied in a novel situation, or practical studies which compare various designs, would be of interest. Of particular value are theoretical papers which discuss the applicability of new work or applications which engender new theoretical applications.