Advanced Materials Research Vols. 998-999

Abstract: The letter reports the analysis of the reduced-size planar microstrip Wilkinson power divider which uses miniaturized microstrip line instead of conventional quarter wavelength transmission line. The full design formulae of the miniaturized Wilkinson power divider with arbitrary power ratio is first proposed.3dB one-stage and two-stage miniaturized Wilkinson power divider are designed according to the formulae. The ADS EM simulation results of the one-stage miniaturized Wilkinson power divider when the smaller electrical angle is 45 degrees show its reflection coefficient<-20dB,isolation>20dB and the transmission loss<0.4dB in the bandwidth of 28.9-34.9GHz,for the two-stage reduced-size Wilkinson power divider its reflection coefficient <-20dB,isolation>20dB and the transmission loss<0.4dB in the bandwidth of 26-37.5GHz.This kind of miniaturized Wilkinson power divider has a very compact size as well as good match and isolation.

Abstract: A method based on regional correlation and color histogram match was proposed for multi-target adaptive tracking. Firstly, target detection method was used to get the difference images. Then, the same target could be recognized according to the correlation of target regions of consecutive frames and the matching rate of color histogram. Finally, the active value, lifetime and dormancy value of targets were used to carry out long-time target tracking and deal with the problems of missing detection, false detection and target exit. The experiment shows that the method proposed in this paper has reached to a high accuracy rate of 95%, which has good robustness against the processing of missing detection, false detection and target exit.

Abstract: A nonlinear controller is presented for a digital hydraulic cylinder against disturbance. We first establish the nonlinear model of digital hydraulic cylinder position control system. Then a Lyapunov function and a nonlinear controller are presented. The controller designing problem is translated into the problem of solving a linear matrix inequality. The experiment results show that the controller proposed by this paper has much better performance than traditional one.

Abstract: A rapid learning algorithm was put forward to realize complex system modeling and self-adaptive control with uncertainty, high nonlinear and lame time-delay. Merits of internal model control were combined, such as simple design, food regulation capacity, high robustness and the ability to eliminate the unknown disturbance to construct a internal model control system based on wavelets neural network, which was characterized by high robustness and quick response speed and then it can brim food control performance when controlled objects vary in a wide range. Finally, it was triumphantly used in simulation of the superheated steam temperature reduction control system of 500 MW unit and food performances are obtained.

Abstract: The status of anti-aircraft weapon system firing precision test is introduced firstly, and aiming at the deficiencies of high cost and long cycle and complicated organization process, a virtual and actual complex firing test method based on sampling is proposed and the principle of virtual and actual complex firing test is introduced. Then the structure chart of virtual and actual complex firing test system is put forward, and system’s major functions are mainly discussed in this paper. The data flow, organizing execution flow and validation notion of virtual and actual complex firing test are acquired finally.

Abstract: In the continuous casting production casting speed and casting temperature fluctuates frequently, the secondary cooling control of slab surface temperature fluctuation is too big problem, proposes a radical.The utility of the pulling speed cascade water distribution control method, a kind of development.secondary cooling control model for slab continuous casting.

Abstract: For solving the separate problem of electronic equipments structure and electromagnetic design, software system for the multi-field-coupled and multidisciplinary optimization (MDO) of electronic equipments is developed, based on electromechanical coupling theory, using parameterized modeling, MDO technology. The result of applied in reflector antenna and high density case shows that the system can promote analysis and design quality, shorten the design cycle, reduce the cost of design.

Abstract: A near-Earth space scene digital modeling was studied for the model simulation, which could be used to show the virtual near-Earth space scene with a high fidelity. Based on the technology of computer graphics processing, detailed analysis was proposed to study the effects of the rendering of geometry models to processing in real-time, the method of spatial movements to objects motion, and the role of spatial illumination to objects brightness, furthermore the simplified, modeling and adjustment methods of each model were demonstrated. The digital model of the HDR near-Earth space scene was established, which laid the theoretical and engineering foundation for the virtual scene simulation.

Abstract: For the problems of the environment, it is important to monitor and manage the environment. The system of environment monitoring based on the Internet of Things (IoT) technology is proposed, which meets the need of the practical application. The central discussion is about the application of the self-organization mechanisms of networks and the wireless location technology. The system is composing of network nodes including the sensors, the wireless acquisition, the wireless coordinator and the information managing software. The self-facture nodes implement the standard of the zigbee settlement for its strongpoint of the low power consumption and the low cost. The results show that the system of environment monitoring has good performance such as the real-time data collection, the wireless transmission and the intelligent monitoring, so the system is feasible to the practical application.

Abstract: Boiler is a complicated control object with multi-variable, strong coupling and uncertain time-delay. It is hard to get ideal control effect with normal controller. This paper presents the overview of advanced control techniques in traditional process control of boiler, such as PID multiplex control system, modern control system, intelligent control system, decoupling control system and robust control system. The future of advanced control research and application is also discussed.