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In this paper, a model characterizing hysteresis, creep, and dynamic effects is proposed for simulation and control system design of piezoactuator-based nano-positioning system. Fractional-order integrator is employed to characterize the creep behavior at low frequencies. Maxwell resistive capacitor (MRC) model is used to capture the rate-independent hysteresis lying in the electric domain between...
This paper proposes a modified Maxwell-slip (MS) model to capture convex and/or concave asymmetric hysteresis in smart actuators. The original MS model can only capture antisymmetric hysteresis. To overcome this limitation, generalized elasto-slide operators (ESOs) are constructed to replace MS elements. Each ESO is characterized by its spring extension stiffness constant, maximum extension, compression...
The study of definable sets in various generalized rough set models would provide better understanding to these models. Some algebraic structures of all definable sets have been investigated, and the relationships among the definable sets, the inner definable sets and the outer definable sets have been presented. In this paper, we further study the definable sets in three types of covering-based rough...
To improve the performance of piezo nano-positioning system, feedback controller is designed based on the linearized hysteresis-compensated model of piezoelectric actuator (PEA). Nonlinear hysteresis is compensated for using Maxwell resistive capacitor (MRC) model. Then, a linear system is identified with this hysteresis-compensated dynamics. Based on the identified linear model, a trajectory preshaping...
The fundamental of neural network and its application are introduced firstly. Then the main factors which affect the runoff and the sediment transport volume in the problems of the water and sediment fluxes in the Yellow River Mouth during the flood and non-flood period are analyzed. Furthermore, the BP model is set up by using the program in the toolbox of the neural network under the environment...
There are several methods to estimate fractal dimension in fractional Brownian motion model. In this paper, one of methods, the variance method, is analyzed detailedly, and some problems in the method are pointed out. To resolve the problems, an improved method is proposed. To validate the method, a comparing experiment of two methods is designed. In the experiment, a SPOT image is selected and five...
The paper presents some methods to obtain a reliable land scale for orchard demand in Hubei province. Benefit from its advantaged geographic position, Hubei is famous for its agriculture land resources. The orchard have made phenomenal progress over the years, especially orange, apple, pear, peach grow have already form a system of considerable size, moreover, Hubei is one of the chief tea-producing...
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