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The state estimation for switched systems with nonlinear disturbances and the bounded exogenous input is investigated in this paper. By using the generalized Gronwall-Bellman inequality, we obtain some estimation results for the solutions of the systems under arbitrary switching laws, which extend some existing results in the literature to the more general nonlinear case. Finally, an example is provided...
For the linear systems, the performance of unstable plants is limited by the unstable poles. Though the nonlinear H∞ design inherits the design idea of H∞ in linear system and can solve a series of design problems about a class of nonlinear systems, but there is not a perfect result, especially that of HJI inequality. The paper deduces HJI inequality which is suitable for nonlinear H∞ state feedback...
Linear control design was adopted for unstable controlled plant, whose property was influenced by the unstable pole value. Therefore, design results can not satisfy the requirement of disturbances rejection and robustness. A effective nonlinear control design method, which combined effectively with state feedback control and PI-PD switching control, was proposed in the paper. Considered synthetically...
Linear motor has good performance and be able to realize high precision positioning. But, due to no transmission, damping ratio of the linear motor is too small. Then, the vibration cannot be well damped. To suppress linear motor vibration, a new control structure based on traditional cascaded PID control strategy is proposed in this paper. A new control loop is added to connect outer-loop with inner-loop...
This paper introduces a method of the colorimetric temperature measurement based on data fusion algorithm. The temperature results can be calculated by two adjacent color components through Bayer filter array in front of CCD image sensor of digital camera substituting into colorimetric formula. Each 4 × 4 pixels calculated can get eight temperature values. Because of temperature's continuity, one...
This paper describes a series of experiments of underwater radio frequency communications both in fresh water and sea water. We observed than due to skin effect, radio waves attenuated rapidly at first before skin depth appears and then attenuated gently just as theoretical prediction. The relationship between skin depth and frequency in water is discussed and graphical relationship is also given...
In order to solve ill-conditioned problem more efficiently, a new method called Adaptive Regularization Method based on Normal Operator(ARMNO) is proposed. By analyzing weakness of the existing adaptive regularization method, we gave a new regularization strategy for ARMNO. Property shows that ARMNO has stronger regularity than Tikhonov regularization method. For illustration, a measured GPS example...
A measuring method of molten pool temperature which is influenced by various factors is designed based on multi-sensor data fusion. With the time-varying measured object, an adaptive weighted fusion algorithm for searching the minimum standard deviation is proposed here. The corresponding weight is achieved by using sensors measurements through approach of self-adaption. The statistic characteristics...
This paper studies the positive solutions for a class of three-point boundary value problem. This arguments are based upon the Schauder fixed point theorem. Since the technique to obtain the Green's function for the three-point boundary value problem is different from that of previous papers, and the nonlinear term is involved with the first-order derivative explicitly, our work is new.
A face recognition method based on fuzzy data fusion is presented. In traditional principle component analysis method, operating directly on the whole face image leads to only global information about face image can be extracted and local one may be neglected. It is not very effective under variations of facial expression, pose and illumination. To solve this problem, in proposed scheme, each original...
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