Advanced Materials Research Vols. 204-210

Abstract: In order to more rapidly and accurately diagnose the fault, the CAN bus was applied to system. In this article, an intelligent fault diagnosis method is presented for the diversity, uncertainty and complexity of device faults. The system can directly access self-test information and on-line test information, and information fusion technology, stator current and rotor vibration signals as a diagnostic characteristics input signal were introduced into the motor fault diagnosis. In accordance with the appropriate information, monitoring signs separately adopt a diagnosis sub-network to complete different aspects of fault diagnosis; diagnostic reasoning and drawing conclusions of fault diagnosis. Experiments show that this method is simple and effective. It can also be applied to other fault diagnosis of complex systems and has certain portability.

Abstract: In this paper, the fast multipole virtual boundary element - least square method (Fast Multipole VBE - LSM) is proposed and used to simulate 2-D elastic problems, which is based on the fast multipole method (FMM) and virtual boundary element - least square method (VBE - LSM).The main idea of the method is to change computational model by applying the FMM to conventional VBE - LSM. The memory and operations could be reduced to be of linear proportion to the degree of freedom (DOF) and large scale problems could be effectively solved on a common desktop with this method. Numerical results show that this method holds virtues of high feasibility, accuracy and efficiency. Moreover, the idea of this method can be generalized and extended in application.

Abstract: In classroom, students do more listening than reading. Listening competence is “larger” than speaking. The significance of listening in second language acquisition can never be overestimated. Listening comprehension has been a focus for college English learning for years in China. With the information obtained from listening, learners build up their own linguistic system and are ready to retrieve whatever they want when they speak and write. There are many factors that affect listening, among which materials play a key role in facilitating listening comprehension. In order to achieve the final goal of promoting listening competence, teacher must realize that listening materials should be tailored to the needs of individuals. Based on the exploration of the nature of listening comprehension, this paper verifies the elements hindering learners’ listening competence on the basis of the need analysis and Krashen’s input hypothesis. With a questionnaire conducted at Wuhan Polytechnic University ，and the author accordingly concludes that a feasible materials should meet the learners’ requirements so that the enhancement of listening comprehension can be achievd.

Abstract: The intensity of the spring was adjusted with finite element method and the distributive laws of stress field and displacement field were obtained. Thus the maximum shear stress was got through the formula of spring intensity. So, two methods on analyzing the stress of cylinder spiral tension spring were introduced in this paper. One is the finite element method; the other is the formula of spring intensity. Then analyzing the spring deformation under load clarifies the function of the finite element method upon spring design, selection and strength check, and improves the reliability of spring design and shortens design time.

Abstract: A production distribution problem (PDP) with the third party logistics (3PL) is discussed in the present paper. Then, a PDP model is built as an extended type of vehicle routing problem (VRP), which is a classical model in logistics. The novel model can be transformed into the combination of generalized travelling salesman problem (GTSP) and TSP with constraints. Some characters about the existing solutions of PDP are discussed. As a result, a genetic algorithm for PDP is proposed. Finally the result of numerical simulation shows the feasibility and effectiveness of the new model.

Abstract: Transmitter is one of the communications-equipment in modern industrial. The basic principles of the transmitter is described in this article at fist, and then the multi-carrier multiple smart grid electricity transmitter is proposed. The transmitter takes advantage of multi-carrier communication technology and more effective solution to solve measurement data transmission problems in smart grid. In the carrier module, the source information with high-rate is changed into low-rate parallel data streams, and then is modulated, the modulation signal is added and changed into transmitted signal, and each carrier can use different modulation. Low-speed data is demodulated by appropriate demodulation mode at the receiving end, and then original data stream is synthesized by parallel -to-serial conversion.

Abstract: The multi-point initiation control technology of electronic security systems uses high-performance and high-pressure transformer, which gains efficient multiple high-pressure slapper ignition energy. Because of its small size, light weight, good high frequency performance characteristics of electronic security systems for the high-voltage transformation circuit, piezoelectric transformer provides a new solution. Firstly, the structure and working principle of electronic security systems based on piezoelectric pressure converter is discussed in this paper. By analyzing the high-voltage converter output circuit of the equivalent load of converter, the frequency characteristics of the charging process for the piezoelectric-driven frequency high-voltage converter is designed in theory. To improve the efficiency of its high-voltage charge, control circuits such as quantum-based control mode design is presented. At last, high-voltage converter of piezoelectric multi-point initiation of electronic security systems technology is given here.

Abstract: As an off-line simulation tool, the modular modelling method of Matlab/Simulik has the features of high efficiency and visualization. In order to realize the fast design and the simulation of prototype systems, the new method of SignalWAVe/Simulink mix modelling is presented, and the Reed-Solomon codec encoder-decoder model is built. Reed-Solomon codec encoder-decoder model is simulated by Simulink. Farther, the C language program and model the .out executable file are created by SignalWAVe RTW Options module, which completes the hard ware co-simulation. The simulation result conforms to the theoretical analysis, thus it has proven the validity and the feasibility of this method.

Abstract: In this work, the notion of matrix-valued multiresolution analysis of space L²(Rⁿ, C^s×s) is introduced. A method for constructing orthogonal matrix-valued ternary wavelet packs is developed and their properties are discussed by means of time-frequency analysis method, matrix theory and functional analysis method. Three orthogonality formulas concerning these wavelet packets are provided. Finally, new orthonormal wavelet pack bases of space L²(Rⁿ, C^s×s) are obtained by constructing a series of subspaces of orthogonal matrix-valued wavelet packets.

Abstract: Aiming at the teaching and training requirements of new equipments, a new kind of military teaching and training paltform for follow-up system of Self-Propelled Gun is put forward. The demand analysis, development program, design of software system and hardware sytem are discussed in detail. The data flows and control processes indicate that this simulation and training platform simulates the mechnical and electrical procedures under semiautomatic and fully-automatic mode completely and vividly. Through operating board, various circumstances and targets can be setted according to training receiver and sujects. Fault setting, detection and maintenance are convenient and easy to observe. This platform has been used in new equipment’s teaching and training and shows good effectiveness.