Applied Mechanics and Materials Vols. 475-476

Abstract: For the sinusoidal maneuvering missile, its important but difficulty to distinguish the Base Course with Constant Velocity Model and the Tangential Arcs Model as the trajectory model. Their similarities and differences are studied to find out the selection method firstly, and their mathematical models are set up in the base-course coordinate system based on the existing references. Using the kinematical equations, the control complexities are derived. Then with the premise of same amplify, same max tangential velocity, same base-course pitch, their overloads and plane trajectories are compared, and drawn out some useful conclusions, such as TA model should be the prior selection for route planning, while BCCV model could be its approximate solution under certain conditions.

Abstract: The output feedback exponential robust control for networked control systems with stochastic network-induced delay and packet dropout is studied. Firstly, a state observer is designed for estimating the state values and compensating data dropouts. Then the closed system is modeled as asynchronous dynamical system constrained by configuration event rate. By using Lyapunov principle, sufficient and necessary conditions for robust stability and exponential stability of the closed loop system is obtained and the output feedback controller design method is presented. Simulation example for the design is done, comparing with the other relative methods, the results shows the validity of the method.

Abstract: In this paper, a fuzzy PI control method is proposed in order to overcoming shortcomings of traditional PI regulator control permanent magnet synchronous motor, in this paper. This method combined traditional PI control with fuzzy control is enable to achieve self-tuning fuzzy parameters PI control and take into account sensitivity, and robustness of the system. A double-loop (current loop and velocity loop) fuzzy control system is designed by this method. Modular design of the fuzzy PI controller based on FPGA chip is realized and simulation and experimental is done. The experimental results show that this system has advantages of fast response characteristic, good stability and high precision adjustment.

Abstract: A monitoring system used in marine sink-float safety device is introduced. The ARM Cortex-M3 is the core of microcontroller in this system, and the hardware and software architectures of the monitoring system are designed. The designed monitoring system can multi-point monitor marine environment around sink-float safety device, by doing this, the safety device can take marine equipment to escape from harsh marine environment by submerging a certain depth. So we can make sure marine equipment safe and normal. The experimental results show that the sink-float safety device can work normally in the harsh marine environment with the monitoring system. The acquisition of multi-point environment monitor as well as data management is achieved effectively. The reliability and safety of equipment are guaranteed by the sink-float safety device.

Abstract: s: Polymer mixing is the key process of rubber products manufacturing, and mixer is the core equipment in polymer mixing process. By analysis of the effective factors on mixer mixing temperature, this paper study realization method of temperature control system. A polymer temperature control system using tandem mixing technology is designed to improve the mixing efficiency and the quality.

Abstract: In order to overcome the limitation of common methods in modeling test system of broadband electromagnetic pulse (EMP), the paper provided a stepping identification arithmetic to solve the problem of building model in whole frequency range. It obtained low-frequency model and high-frequency model respectively in low-frequency domain and high-frequency domain by identification using import signal and output signal measured by test, it obtained the identification model of the test system by connecting the low-frequency model and high-frequency model, the model was simplified by offsetting adjacent poles and zeros. The results of simulation and test show that the papers method can reflect the dynamic characteristic of the system in whole frequency range, and it is feasible in practical application.

Abstract: In the presence of obstacles, the existing flocking control algorithms with virtual leader dont always pass through the obstacles smoothly, especially for wall obstacles. In the paper, a modified flocking control algorithm with virtual leader is proposed, by analysis and simulation, the results show the modified flocking control algorithm can pass through the obstacles smoothly, including the wall obstacles.

Abstract: In the paper, we analyze the distributed flocking control algorithms under virtual leader-follower model with communication time-delay. Under virtual leader-follower model, flocking algorithm can avoid diverging, but the performance of flocking control algorithm with communication time-delay often degrades. In the paper, we analyze the impact brought by communication time-delay on the flocking algorithm when part agents can receive the information of the virtual leader, and simulations are done. Results show that the performance of distributed flocking algorithm depends on the number of agents that can receive the information of the virtual leader and the communication time-delay. Bigger is the number of agents that can receive the information of the virtual leader, better is the performance of flocking algorithms with communication time-delay.

Abstract: In this study, an optimization algorithm is proposed for asymmetric s-shape acceleration/deceleration to achieve better contour accuracy for biaxial systems. The optimization is based on the method of genetic algorithm incorporated with the constraints made by the motion system. Numerical simulations of an XY table driven by linear motors following a simple cornering path verify the effectiveness of the proposed algorithm.

Abstract: This passage mainly introduces about the design of liquid level and boundary measuring control at sewage re-flooding craft in small split oil field. In order to achieve automatically cutting flooding and re-flooding in the procedure in small split oil-field, the scheme is to test liquid level and boundary by using high performance to price ratio new double level gauge, to utilize electric valve instead of mechanical valve and to choose PLC to control system logic. Eventually, it will reduce the labor intensity.