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The technology of Bank-to-Turn is an important development direction of hypersonic glide vehicles' control. But there is a strong coupling between roll channel and yaw channel when the vehicle is in rolling maneuver. In this paper, a dual decoupling fusion control method is presented based on aileron-rudder cross decoupling control and model reference global sliding mode control for the problem of...
This paper presents a rolling bearing fault diagnosis approach based on the combination of Ensemble Empirical Mode Decomposition (EEMD), Information Entropy (IE) and Support Vector Machine (SVM). The horizontal and vertical vibration signals of the bearings are utilized as the input of the method. First, the signals, after preprocess, are decomposed into certain number of intrinsic mode functions...
In this paper, the elastic wave band gaps of a new 1D rod phononic crystal with two inside-period structures were theoretically investigated by lumped-mass method. Calculation revealed that the large band gaps are easier to be obtained than that of 1D simple lattice phononic crystal. The band gaps become wider and the pass band filtering properties become more perfect by reducing the lattice constant...
Frame decomposition is flexible in representing arbitrary signals, and thereby is effective in matching the characteristic structure of and extracting the time-frequency features directly. It is applied to analyzing the gearbox vibration signals under healthy and faulty statuses. Based on a wavelet frame, the periodic impulses characteristic of localized damaged gear vibration are extracted in joint...
Matching pursuit is effective in matching the characteristic structure of signals and extracting the time-frequency features directly. It is employed to analyze the vibration signals of a gearbox under healthy and faulty statuses. Based on a compound dictionary, the periodic impulses characterizing the vibration of localized damaged gears are extracted in joint time-frequency domain, and the localized...
In this paper, high-speed, large-range scanning control of piezoelectric stack actuated platform is discussed. In order to obtain preferable tracking control, an inverse Modified Prandtl-Ishlinskii model (MPI) is first established to reduce hysteresis nonlinearity. Then, a second order linear model is identified and a polynomial-based damping controller is designed to damp the first resonant frequency...
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