Key Engineering Materials Vols. 480-481

Abstract: Fixed lead angle is an essential element of torpedo salvo data compendium preparation。On the basis of the characteristics and clear conditions of wake auto guided torpedo‘s salvo，a method of computing fixed lead angle was put forward and A computation example by proposed method was given. The computation result shows that the proposed method is effective and practical.

Abstract: This paper presents a new steering control structure for vehicles equipped with four-wheel steering system. A linear model of the lateral dynamics is used in this paper. This control structure is based on a simplified linear model of the lateral dynamics of such vehicles and aims to decouple the control of sideslip from the control of yaw rate. The control design is based on a linear multivariable plant and the front and rear steering angles, According to the Individual Channel Design paradigm. The proposed control structure has been applied to design sideslip and yaw rate controllers using a more accurate model of the lateral dynamics of four-wheel steering vehicles. Simulations are used to illustrate the performance and robustness of the designed controllers.

Abstract: This paper took the high-speed wire rod rolling process of φ20 bar as the research object, to be simulated numerically under the work platform of the finite element software DEFORM. The simulation results were compared with the actual operation of the production process, the rolling simulation reappeared the actual production situation, realized the visualization of the rolling process. After analysis, the defects of rolling technology were found out. Based on the research, the optimum design was gotten and then simulated which improved the actual production process and avoided the original defects. The optimum design is feasible to practical production and reduce the cost of test in practice The paper just focused on the first one of 12 rolling process as an example to show the simulating process and results.

Abstract: The solar tracker, a device that keeps PV or photo-thermal panels in an optimum position perpendicular to the solar radiation during daylight hours, increases the collected energy and can be considered as one of the economical renewable energy in generating electricity. The current trend in solar concentrator tracking system is to use an open-loop local controller that computes the direction of the solar vector based on geographical location and time. It is not accurate because it has error from computing the intensity variation. Literature suggested that the photovoltaic panels could produce maximum power if the panels have angle of inclination zero degree to the sun position. In this research, genetic algorithm is one of the optimization techniques used to maximize the performance of solar tracking system. Research shows that among the heuristic approaches within 50 generation, Genetic Algorithm reaches the best fitness value at 0.01706 with optimum voltage 10.05V.

Abstract: At present, the structural dynamic observation by scanning electron microscope (SEM) has a wide range application in the research and production of materials. In this scheme, the sample stages with the function of stretching, compressing, bending and twisting samples are designed by reforming the construction of scanning electron microscope sample stage. Specifically, the aim of conducting structural dynamic observation is achieved by installing different mechanical clamping devices on the scanning electron microscope sample stage base. Furthermore, the sample stage has simple structure, low lost and practical advantages.

Abstract: For the characteristic of cross-coupled multi-disciplinary research of microcomponent effect plays an important role in the MEMS system. The combination of different effects has the different component principle, then forms the different functional device, completes the different functions. Effect and effect principle modeling of microcomponent in conceptual design for microcomponent are introduced. The effect classification of microcomponent, formal description of effect, the relationship between effect and principle and function decomposing and the mapping between effect and function are described, and the effect model for microcomponent is established. The model is the basis of microcomponent conceptual design solution.

Abstract: A high efficiency axial-flux brushless DC motor assisted by self axial magnetic bearing and used in flywheel energy storage system is proposed in this paper. In this design, the rotor with composite rim acts as the flywheel of the system and is sandwiched between two disk type stators which are made of amorphous metal to reduce iron losses. The dual-stator machine combines the functions of axial flux brushless DC motor and axial magnetic bearing to rotate the flywheel-rotor and levitate it in vertical orientation. The other four degrees of freedom in radial directions are constrained by ceramic ball bearings for simple operation, high efficiency and long life span. Optimized design approaches are employed to achieve low losses, and high power density. Three-dimensional FEM analyses are implemented, and the analysis results support the feasibility of the proposed motor.

Abstract: The video Monitoring System is an important part of intelligent building security system. The structure of the video Monitoring system is analyzed ,the system is proposeed and each sub-system software design are presented in this thesis.the system has obtained more satisfactory effect in practicability, reliability and cost.

Abstract: Considering the control requirements of guided projectile, a novel method is studied that using three low-cost MEMS accelerometers as inertial measurement unit to construct state equation and measurement equation of system, using improved unscented Kalman filter (IUKF) to estimate the state of system. For the system characteristic of linear state equation and nonlinear measurement equation, the improved UKF nonlinear filter algorithm which combines KF and UKF was proposed. At the same time, utilizing minimal skew simplex sampling to reduce the number of sigma points, computational efficiency is enhanced. The simulation experimental results show that using IUKF algorithm can obtains good precision of estimation.

Abstract: Pushed by the country policy about energy conservation, the usage amounts of new wall material promptly increases, the production automation has occupied a decisive position in the development of modern wall material industry. For resolving real problems in the wall material production, a process monitor configuration system is constructed based on the PROFUBUS technology, SIEMENS PLC and WINCC configuration software, some control logic, group control ways and data report patterns are designed and discussed, by which the higher-performance and the lower cost can be realized in the wall material production process.