Advanced Materials Research Vols. 546-547

Abstract: The maglev system is a typical nonlinear system, it is difficult to get the best control effect only by nonlinear control method. At first, the maglev system is linearized in this paper, for the classic PID control magnetic levitation system which exists the contradiction between fast and overshoot .This paper adopts the nonlinear tracking-differentiator-based PID controller to control the maglev system. Finally simulation results show that the nonlinear PID controller has fast response speed, no overshoot, and strong robustness in controlling the maglev system.

Abstract: This paper focuses on the problem of non-fragile robust passive control for a class of nonlinear singular systems which contain structure uncertainties and time delay. A memorial state feedback controller is considered, and the controller is constructed such that closed-loop systems are generalized quadratically stable and passive with dissipation. The algorithm is given for obtaining the maximum dissipation, at the same time, the maximum guaranteed dissipation controller is proposed. Numerical example is presented to show the validity and applicability of the proposed method.

Abstract: According to the characteristics of data in coalmine industrial Ethernet ring networks and in order to guarantee the demand of the real-time data in it, a hybrid scheduling method with non-preemptive priority and EDF scheduling method based on the IEEE802.1p protocol is proposed in the switch. We calculate the maximum transmitting delay of the real-time data using network calculus theory. The result shows that EDF decreases transmission delay for non-periodic data better than FCFS by theoretical computation and simulation.

Abstract: An observer-based H_∞ control condition is proposed for T-S fuzzy model. The observer and controller are capable of disturbance-rejection. The fuzzy version of bounded real lemma (BRL) is adopted. Output H_∞ controller and observer are designed by solving a set of bilinear matrix inequalities. The condition is shown to be less conservative than some existed results.

Abstract: This paper discusses the control of free flying space manipulators in the impact process which happens in the capturing operation. To solve the intense coupling of the kinematics and dynamics between the space manipulator and the base, this paper builds the noncontact impedance control model of the 6-joint space manipulator system, which can control the space manipulator before impacting with the objects. Computer simulations are performed to verify that the noncontact impedance control method can make the end-effector of the space manipulator keep desired dynamic characteristics and the adjustment of virtual impedance parameters can control the impact force value efficiently.

Abstract: In recent years, Gyro stabilized and tracking platform has been widely used in the guidance, airborne, ship-borne, the military area and civil area such as the weapon, missile seeker, sensing detection, public security fire control, environmental monitoring. In order to improve line of sight stabilization precision of the Infrared Guidance equipment to ensure the stability of the seeker pinpoint the maneuvering target, we do some researches about the essential technologies in the stability and precision of gyro. This paper developed a set of new stable platform used of MEMS gyro device based on the infrared detection system, in view of the zero shift stability for MEMS gyro, with the key technologies for the gyro signal analysis and processing of theoretical research and experiment.

Abstract: According to the characteristics of the production measures process in oilfield , the algorithm based on iterative multi-PCA is presented. Building multi-PCA models based on diffident working conditions. The sensor data will be classified automatic through the weight to find the appropriate model for fault recognition. And adopting iterative algorithm to update the models for realizing on-line process monitoring. The simulation experiment shows that the method is effectiveness on fault diagnosis for oilfield's sensor equipment.

Abstract: This paper deals with the problem of guaranteed cost control for a class of switched descriptor systems. State feedback guaranteed cost controller is adopted to make the resulting closed-loop system stable and cost function have an upper bound. Based on single Lyapunov function and convex combination technique, a switching law is designed and a sufficient condition of the existence of such controller is presented. By means of variables substitution and linear matrix inequality, the condition can be turned to LMI. The advantage of method presented in this paper is illustrated by an example.

Abstract: On the basis of a two-grade CAN-based marine distributed control system, this paper made an in-depth study on principles of making application layer protocol for CAN communication, communication approaches, redundancy switch, and fault diagnosis as well, and has achieved good results in practical application.

Abstract: The paper discusses the modified projective synchronization of two different chaotic systems by nonlinear control laws, considering the conditions of the master-slave systems with uncertain parameters, the synchronization problem between Genesio system and Rossler system has been investigated, adopting the adaptive control method, a sufficient condition is attainted for the modified projective synchronization between master and slave system, finally, The control performances are verified by the numerical examples.