Abstract:Based on the flight data recorded by FDR equipped on a certain aircraft, the model of inertial phase of aero-engine vibration is established by Support Vector Regression (SVR). The abnormal vibration is detected by the difference between the output of model and the real value recorded. According to real malfunction samples, a referenced criterion of malfunction monitoring is given. The existing malfunction samples proved this method to be effective.

Abstract:In order to gain the flow field and pressure coefficient distribution characteristics with different deflection angles on the first layer of the maze composite coding structure in combustor, a two-dimensional numerical simulation model is employed in this paper. The results show that the pressure coefficient is the lowest at [WTBX]α[WT]=+30°, which can provide beneficial references for the experimental investigation in the cooling performance and design of the maze composite coding structure.

Abstract:Experiments are conducted to determine the distribution of static pressure and pressure coefficient in a pin-fin trapezoidal duct that models the cooling passages in gas turbine blades. The result reveals: (1) When the lateral off-take ration (C) is less than 1, i.e. (C﹤ 1 ), the radial variation of the static pressure is not remarkable. At the entrance and exit of test segment, the static pressure is higher than that in the middle of test segment; the chordwise variation of the static pressure is intense. The changing grade of the static pressure is much larger at the chordwise exit than that at the left of the pin-fin. (2)C=1, the variation of the static pressure of the end wall mainly concentrates on the along chordwise direction. The trend is the same as conclusion one. (3) The lateral off-take ratio's effect on pressure coefficient is much higher than the Re number's. The pressure coefficient is decreased with the increase of C

Abstract:The development of hypersonic aircraft is one important aspect of aeronautics and astronautics in 21st century. The scramjet, the engine of hypersonic aircraft, is a key apparatus. In this paper, the laminar finite-rate and turbulence model are applied and the reaction model of seven components and eight equations, which Morreti presented is accepted. The effect of non-equilibrium chemical reaction is considered. When combustion heating equipment is used in the experiment of scramjet, the mass of vapor produced by test medium is investigated through numerical simulation. The investigation shows that the vapor in contaminants has an obvious effect on the performance of scramjet, the last effect of mass of vapor in gas on the performance of scramjet is decided by the initial condition of the flow.

Abstract:The paper assesses the project quality of single aircraft shelter by adopting artificial neural networks, and a BP assessment model is established. The model is used to assess the project quality through self-study, association, memory, and classifying based on the specialists assessing result of every project. According to the theory and practice, it is proved that the neural networks can assess the single aircraft shelter project quality more precisely.

Abstract:In order to study reliability modeling, an analysis of air-defense missile weapon system networking topology is given and also a discussion on networking theory is given. Mission configuration of single fire unit under networking is studied, and a networking reliability model is put forward with specific calculation. The model is applied to a networking air-defense missile weapon systems reliability modeling, which has perfect effect in both military and economic fields.

Abstract:The index structure of comprehensive antiaircraft system is set up in this paper. And the paper applies fuzzy clustering and information entropy to synthetical evaluation. On the basis of the existing algorithm, it puts forward a new method based on fuzzy clustering and information entropy to evaluate antiaircraft system and then validates the method with examples. It proves that the method is correct and practical, so, the process of evaluation is in accord with people's cognition much better and the result of evaluation is more creditable.

Abstract:The wavelet analysis is a novel mathematical method. It is more effective than the existing methods in data compressing and margin detecting due to its predominant properties in local analysis. Based on wavelet transform, a method of feature extracting of radar signal is presented in this paper. The signal's feature is gained by first computing wavelet transform of radar signal, giving a threshold, transforming wavelet coefficients into binary ones and then transforming the binary coefficients into decimal ones. Many experiments of target recognition demonstrate that this method is effective.

Abstract:Based on the analysis of a great deal of recent technical reports and research results on WSN, the evaluation criterion of the performance and the taxonomy for wireless sensor networks target localization and tracking algorithm are described, the principles and characteristics of recent representative localization and tracking approaches are discussed and presented in detail, the directions of research in this field are introduced.

Abstract:Aiming at real-time tracking of driving behaviors and improving safety, the paper analyzes and discusses the necessity, characteristics, architecture and function of onboard image-based on driving safety monitoring system. Directed against image collection, processing and understanding, based on digital signals processing technique, the paper also puts forward hardware design of onboard image-based on driving safety monitoring system, in which TMS320DM642, a kind of embedded DSP chips is used as a central processing unit. Software flow is also designed according to the driving traits. Experimental results prove that the system works well.

Abstract:A method of digital beam formation of smart antenna system is introduced. By the method, FPGA is utilized for conducting the spatial filter, weight estimation is realized through the float point calculation of DSP, thus preventing High order addition carry from lowering the calculation speed. Simultaneously the flexibility of system is improved by updating the adaptive algorithm in the software way. And, the method is easy to implement in practice.

Abstract:The characteristics of weak and small target are different from these of clutter in smaller area, which is used as a pre-detection weak and small IR target. Experiments are presented to demonstrate that this method can enhance the SNR and can be used in clutter background.

Abstract:Starting from the definition and models of data fusion, this paper introduces the elements and model with three-layer of situation assessment. And then a model with four levels function containing battlefield target mergence, situation assessment conjunction, two sides Game interfered theory, likelihood situation forecast is established. Simultaneously, the realization of using space classification technology, template technology, Bays and NN in each module is also discussed.

Abstract:This article elaborates the basic principle of digital signature, and discusses how to use this technology to ensure the integrity, authenticity and non-deny in the file transfer system of electronic military affairs. Finally, this article gives a model of file transfer system based on the digital signature technology, and makes it realized based on J2EE platform by using Java2 security system. This digital signature ensures the integrity and confidentiality to the file.

Abstract:Based on the achievement of link of laser satellite communication, the vibration of satellite platform with Rayleigh distribution is described, BER of optical communication of Gauss beam in IM / DD is computed, which can provide significant instruction for the design of laser satellite communication system.

Abstract:When laser transmits in atmosphere, the factually received signal is a random variable, which has the coherence in time and space. The model of the optical channel in strong and weak turbulences is analyzed, the system performance is studied by maximum probability detection.

Abstract:The analysis and design of an array antenna with beam shaping in vertical plane is introduced in this paper, and the numerical method is adopted in synthesizing the radiation patterns. Based on the mean deviation and project practice, the object function and constraints are presented respectively. By optimizing the object function, the feeding currents of column are obtained. The measured radiation patterns satisfy the requirements of beam shaping well, which demonstrates the effectiveness of this approach.

Abstract:A method of UWB radar target recognition based on eliminating impulse response is put forward. The process of target poles extraction can be skipped when this method is used in target recognition. This target recognition method is deduced theoretically in detail, the rule of selecting narrow pulse is presented. Finally, the mathematical models of approximate impulsive response about two aircraft in different pose are obtained via computer simulating. Based on these models, two aircraft models are recognized. Simulation results show that this UWB radar target recognition method is effective.

Abstract:In this paper, the two-dimensional numerical solutions of the electrostatic fields in plasma region with undecided conductor boundary conditions are discussed. Methods of processing such boundary conditions including conductor within plasma or at the boundary are considered. On the basis of this work, the potentials in a gas discharge absorption unit fixed on a conductor surface of an object is obtained. The method can be used in PIC particle simulation code to enrich its application in solving such boundary problems.

Abstract:In this paper, the upper and lower bounds on the expected distortion of an ULP distortion - based solution are given, which depends only on a rate-based solution and an ELP distortion -based solution. Then a new algorithm based on estimation is presented for the selection of the optimal interleaver parameters. Instead of computing each ULP distortion-based solution for each possible choice of interleaver parameters, it estimates the expected distortion of each ULP distortion-based solution from its upper and lower bounds, which results in the speedup of the search process for the optimal interleaver parameters. Experiments are carried out with the source coders of SPIHT and 3D SPIHT by using the network model of two-state Markov. The results show that the new algorithm is characterized by higher estimation precision with similar computational complexity as compared to the previous algorithm.

Abstract:In this paper, dynamical LMS algorithm and global optimization algorithm, with a view to gradient of error probability, are proposed based on analysis of sub-carries allocation space for OFDM system. Global optimization algorithm comes from combined GA. Relative to Hughes-Hartogs algorithm, these two algorithms are lower in complexity, and they both have recurrence characteristic. Simulation result shows that dynamical LMS algorithm is close to the optimum in fast fading channel, and the combination of dynamical LMS algorithm and global optimization is close to the optimum in slow fading channel in efficiency.

Abstract:This paper uses the theory of analyzing fuzzy set and sets up a model of fuzzy synthetic judgment about equipment overhaul price. And the factors affecting the equipment overhaul price are explained and quantified. An example of calculating the equipment overhaul price is provided, and the result is analyzed, which provide theoretical basis for the price fixing department of equipment maintenance to make decision.

Abstract:Methods of the controllable - aberrance, random - aberrance and an idiographic dynamic clonal selection algorithm are put forward. Sets of suspicions computer virus are established, which contribute to the reduction in the mistakes (FPR) of the immune system. A virus detection model based on the idiographic artificial immune system is put forward and realized. Emulation experiment shows that the model can identify not only old virus, but also new transmutation virus and is a self-adapted, and diverse model for virus detection.

Abstract:The fault diagnosis based on nonlinear spectral analysis is a new fault diagnosis theory. In allusion to the online estimation problem of generalized frequency response functions in this fault diagnosis method, a new method is studied for obtaining generalized frequency response functions of the detected system by using Volterra kernels in time domain. Based on the robust Volterra total least mean square adaptive identification algorithm, a new online estimation method for generalized frequency response functions is presented in this paper. The presented method can be used to efficiently reduce the online computation requirements of generalized frequency response functions, and is can be easily realized. The simulation results indicate that the presented method is efficient.

Abstract:Based on grid resources co-allocation system model, a novel strategy called synchronous queuing (SQ) is proposed for implementing co-allocation with QoS assurances in Grids. Unlike the existing approaches, SQ does not require advanced reservation capabilities in the resources. The simulation studies performed to evaluate SQ indicate that it can improve resource utilization rate.

Abstract:The multi-attribute decision making problems that the attribute weights (interval numbers) are partly known and the attribute values are numeric are investigated. Firstly, based on the optimal overall attribute values of alternatives in local and whole, two goal-programming models are established, respectively. Secondly, the ranking priorities on alternatives are obtained by solving the two models. A novel method based on two-phase goal programming model for multi-attribute decision-making is proposed. The method is characterized by simple operation and easy to implement on computer. Finally, a practical example is illustrated to show the feasibility and availability of the developed model and method.

Abstract:This paper introduces the concept of Partial ic- cone-convexlike Maps in local convex topology spaces, and establishes a Partial Alternative theorem. Under the conditions of Partial ic-convexlike Maps, optimality necessary conditions of weak efficient solutions for vector optimization problems with equality and inequality constraints are obtained.

Abstract:The simulation system VV&A is an important activity aimed at credibility evaluation of the simulation system's whole life cycle and one of the key techniques and difficult problems of simulation system research and development. In the paper, the key issues concerning VV&A are deeply studied including the concept system of simulation system VV&A , the process model of simulation system VV&A, and the technology framework of simulation system VV&A standard / norm. The researches provide the countermeasure and reference to the research of complex simulation system VV&A standard.