Linear Feedback Control Method Research Articles

Synchronization of Liu chaotic system based on linear feedback control and its experimental verification

Synchronization of Liu chaotic system is studied. Based on the characteristic of the chaotic system and linear feedback control method, the range of the controller parameter for synchronization is derived, the results of simulation and experiment are provided to show the effectiveness of the proposed method.

Aberration correction and its automatic control in scanning electron microscopes

An automatic aberration correction method has been implemented in scanning electron microscopes (SEM). Necessity of the automatic aberration correction is discussed. The procedure of the automatic aberration correction is explained in detail, where deconvolution techniques are used in order to extract probe information from SEM images. Due to the precise digitization and the usage of proper combinations of correction fields, linearity has been found between the amplitude of each aberration and the corresponding field strength. Experimental results are shown which demonstrate that the aberrations are corrected automatically by a linear feedback control method. After the automatic aberration correction, the image quality has been improved drastically.

ROBUST SHAPE CONTROL OF A FLEXIBLE STRUCTURE

This paper deals with a robust shape control of a flexible structure against parameter variations. Based on a covariance control theory with the principle of detailed balance, a new linear state feedback control method is proposed, where the state vector is composed of the position, velocity, and integral variables. The robustness of the controlled system is acquired by approximate orthogonality between the eigenvectors of the system, and is confirmed with a condition number of the model matrix of the closed-loop system numerically. The usefulness of the proposed shape control method is also verified by hardware experiment.