Advanced Materials Research Vol. 748

Abstract: Adhesion control is an important part of traction inverter control. But the controlling object model is difficult to be built in the adhesion controller design stage because of the nonlinear characteristic between wheels and rails. This paper presents a force transferring model considering wheel-rail interaction of EMU, which is able to simulate the slip phenomenon to evaluate the adhesion control schemes performance and decide the control parameters. At the end of the paper, the simulation was established based on a certain EMU type and two different adhesion control schemes were applied. Comparison simulation result shows the usefulness and effectiveness of the proposed model for the adhesion control research.

Abstract: It is a very difficult task to land on aircraft carrier, because of limits of the carrier runway during rough sea. In this article, a new algorithm of aircraft carrier landing is proposed utilizing airborne infrared camera/inertial integrated system, which can provide the relative positions and orientation of the aircraft with respect to the carrier so as to help aircrafts semi-auto or auto landing. The mathematic relationship between guidance parameters and imaging information was modeled, and then the relative position and attitude information between the carrier and the aircraft were estimated through Newton iteration method. From that information, the pitching, rolling and heave movement of the carrier were estimated and compensated, so the touchdown point could be predicted and provided to the pilot so as to control aircraft landing. On the ground of the theoretic research, the field verification tests were carried out, which adopted the minification scheme to simulate the process of aircraft carrier landing. In the experiments, the runway simulator simulated the motion of the carrier runway and the land vehicle was used as the aircraft. The results verify the landing guidance system scheme is feasible and effective, and lay the technical foundation for the flight test, improving its safety.

Abstract: Based on chord length measurement control method, the research on the key technology for the CNC cool Frame bender has been carried out. Detecting unit has been designed, and analyzing of the detecting objects, its range, parameters converting method are also described. Based on which the NC control system is developed, and also the method for the calculation control parameter and process of frame are described.

Abstract: The paper presents the determination of the constraint forces acting in the human upper limb joints, using the inverse dynamic analysis procedure based on Lagrange multipliers method. The kinematics parameters time variation laws were established through experiments for the considered driving joints. The constraint forces time variation laws define the database for the dynamic analysis using the finite element method and for dimensioning an exoprosthetic system for later rehabilitation of the human upper limb motion.

Abstract: In this paper, based on a coupled ultrasound-gravity approach, we present a new method to separate micro nano-particles and introduce a rapid and easy method to fabricate field flow fractionation (FFF) devices. Furthermore, with an emphasis on the study of equipment engraving and sealing process, we optimize the parameters of processing.

Abstract: Due to reliability requirements, the reaction wheel actuator of the satellite attitude control system always use traditional control method. For the satellite which has complex structure, it's difficult to build the mathematical model with classical control method. The selection of control parameters is also difficult. The design process last long and the model have poor adaptability when the parameters change. Compare to genetic algorithms, genetic programming which have the capabilities to evolve automatically, have the advantage of being able to optimize the structure of the mathematical model. Results of optimization and simulation show that design the reaction wheel actuator control law with genetic programming can simplify the design process. And the evolved control law is better than traditional PD control law.

Abstract: In this paper, we propose a model for short-term traffic flow forecasting based on approximate dynamic programming when considering the influence of related roads. First, construct the system performance index using the error function as the objective function, adjust the action network online according to the minimum index to generate the approximate optimal control vector and the control matrix, then we can get the traffic flow data at the specific road and time to forecast. To illustrate how this method works, we use intersection traffic flow of Hongli road and Shangbu road in Futian Shenzhen as experimental data, which can be demonstrated that this method can increase the forecasting accuracy and meet the real-time forecasting requirements.

Abstract: The problem of semistability for nonlinear autonomous systems is investigated. We develop semistability and unsemistability theorems for nonlinear autonomous systems which is stable. These results of this paper are more tractable and practical for semistability of nonlinear autonomous systems than the existing results in the literature. Several examples are included to show that the proposed method is effective.

Abstract: For singular networked control systems (SNCSs) with uncertain time-delay, the problem of robust control is studied.The SNCS can be modeled as a class of uncertain discrete linear system with uncertain delay. Sufficient condition, which ensures the resulted loop-system to be asymptotic stability with performance index , is derived.Furthermore, the explicit formation of dynamical output feedback controller is also presented.Finally, a numerical example is given to show the effective of the presented method.

Abstract: Linear optimal excitation control (LOEC) mode takes the power system as multiple control target, it has better dynamic performance and adaptability in the vicinity of the equilibrium point. But when the disturbance is too large, the system performance will be deteriorated, meantime controlling lack the terminal voltage control. This paper presents the optimal excitation controller which has a wide excitation control system adapting to a wide range disturbance. The choice of variables is changed based on the variables used in the excitation control of exact linearization. The speed deviation differential is used to replace the electromagnetic power deviation in commonly optimal excitation control system, and the terminal voltage control is added. The improved excitation control system adaptability is enhanced. The simulation results show that the improved excitation controller has a wider adjustment range, anti-disturbance and strong characteristics.