Abstract:The finite-element simulation models of the discrete rod and the projectile impacting on the aircraft panel structure at high velocity are established according to some experiment projects. Based on the explicit dynamic finite-element program, the forming of impact damage in the panel structure is simulated. Through comparing the simulation results of damage pattern and size in the panel to the experiment results, the reliability of the Johnson-cook material models and Gruneison equations of state and Eroding contact algorithm used in the simulations is testified.

Abstract:Time series of pressure signal of compressor is analyzed based on chaotic nonlinear dynamic theory, state change of compressor is studied by the reconstructed phase-space, the existence of chaos is identified by calculating the maximal Lyapunov exponent, the chaotic attractor prediction algorithm is improved and then investigated upon experimental data and locally -linear algorithm as well, the result shows the improved algorithm could reduce error by 9%.

Abstract:The method of developing distributed interactive simulation application systems based on HLA is analyzed. The whole framework of air force station simulation system is introduced. Based on modeling tools Labworks, PRTI, MultiGen Grreator, Vega and VC + +, the air force station simulation system is realized. Each function unit of visual simulation system is laid out, and the working flow of visual simulation system is illuminated in detail. The result validates the feasibility and validity of this method.

Abstract:In view of the regular problems in the airfield clearance condition evaluation, the paper calculates and analyzes the transitional surface range between terminal clearance zone and side clearance zone in detail. The paper indicates the shapes of the transitional surfaces in various zones, calculates the coordinates of the key dots, and puts forward a method of calculating the various dots in the line between transitional surface and inner level surface, and between conical surface and outer level surface. All these have provided a theoretical basis for determining exactly the position, the elevation and the superfluous height of obstacle in the airfield clearance zone.

Abstract:The present airplanes in different grades of airports are chose as design airplanes in the paper. The soil is divided into three grades by lowest value of soil modulus and the dividing principle of soil modulus. It is clear that the range of designing parameters of pavement on the Standardized Structure is achieved based on statistic analysis for test values of the modulus and strength on expressway in China. The Standardized Structure can be calculated on the basis of designing method specified in in China.

Abstract:The damage efficiency assessment of the cluster ammunition is important. In allusion to special targets and damage types, the index used for assessing the operational application effectiveness of cluster bomb is given. Then, a method of assessing the operational application effectiveness of cluster bomb attacking single target and collective targets on land is erected. At last, in combination with examples, the attack effectiveness of cluster bomb to the ground target is enumerated by using the effectiveness assessment software compiled in MATLAB and interrelated conclusions are educed. The calculation results show that the assessment method is reasonable and effective.

Abstract:Through analyzing the cost, benefit and effect of project, combining the quantifiable economic index with the non-quantifiable effect index, an index system that integrated cost-benefit and cost - effectiveness is established, and the goal in synthetic, scientific and effective appraisal of Military Airport Project is achieved. By appraising the supposed example, exerting the AHP-Gray analysis method on the evaluation of the index system, it is approved that the integrated cost-benefit/effectiveness index system is rational, AHP - Gray method is a valid way to solve the problems of benefit and effect, and of qualitative and quantitative indexes in synthetic appraisal of Military Airport Project.

Abstract:The maintenance Mistake is an important factor threatening the flight safety. This article comprehensively analyzes the reasons for causing MM related to the work of airplane maintenance, and puts forward a model to prevent MM based on AHP. A computing example of comprehensive evaluation is given in the end.

Abstract:The principles of the multi-azimuth saturated jamming and blinking jamming are analyzed based on the character of ASLC in this paper, three jamming modes are presented, and the mathematic model of Cancellation Ration and adapted pattern is presented and simulated. The simulation results show that the jamming modes designed in this paper are effective.

Abstract:This paper elicits Phased Array Radar Beam Bound by using Differential Coefficient method, then, compares it with the connection between the measure of phase Shifter and the HPBW, and simultaneously puts forward a selecting standard of Phase Shifters' digit. Finally, the paper analyzes the effect of different Phase Shifters' Digit on the Beam Coverage degree, imitates and compares the Pattern of Beam Scan, which validates the rationality and applicability of it.

Abstract:Tracking maneuvering target with single station has many limitations, but multi-station can offer more information. Then multi-station has a problem of synchronization. By analyzing the course of updating the state, it's found that the tracking can be realized asynchronously and the multi-station dealing with the data in this manner makes the work completely flexible. So, multi-station in a net can increase the tracking range. To solve the non-linearity of the systems, a pseudo-linear observational equation is adopted. The simulation results indicate that this method is stable in tracking aerospace target. Furthermore, the increase in the number of the observation station can improve the precision.

Abstract:A decentralized fusion algorithm based on fuzzy adaptive interacting multiple model (LMM) algorithm is proposed. Some parameters in the model-set are adjusted online by fuzzy inference system so that the model-set adaptive capability can be greatly improved in various target maneuvering patterns, and simultaneously the model conflicts caused by traditional IMM algorithm can be avoided and the computation load decreased. Simulation results show the effectiveness of the proposed algorithm.

Abstract:In this paper, to test the performance of meter-band radar handing over to millimeter-wave target seeker through ground fire-control system and midcourse guidance, a new semi-object experiment system for control and guidance is constructed and used to analyze the influences of radar errors on guidance handover, and the results achieved demonstrate the feasibility of the system.

Abstract:The active noise modulation jamming is an important part of jamming to the radar system. This paper analyzes theoretically and simulates the active noise modulation jamming including RF noise jamming, noise AM jamming, noise FM jamming and noise PM jamming based on Matlab. All the simulation results are analyzed correspondingly.

Abstract:The phase noise of transceiver local oscillator and its influence on sub-carrier signal are analyzed. Aimed at the inter-sub-carrier interference caused by phase noise, an interference cancellation method based on data conjugate mapping is given and discussed. The performances of bit error rate and peak average power ratio are simulated. The simulation demonstrates that the inter-carrier interference cancellation method based on data conjugate mapping is excellent in system performance.

Abstract:In this paper, how to design and implement a mobile agent based Network Configuration Management System is discussed. To overcome the disadvantage that too much time will be expended when the Mobile Agent migrates among resources, a method called Grouping NEs and Sorting Mas is presented. By using the method the efficiency in network management can be increased.

Abstract:According to the requirements of the customer and the technical specification for WAC (Wide Area Centrex) service of fixed network switch, the paper describes the realization and the application of the WAC service in exchange, and discusses the realization of the WAC service and the realization mode by comparing IN (Intelligent Network) mode with exchange mode, which makes WAC supply service in as cheap and convenient a way as possible.

Abstract:A simulated annealing genetic algorithm for load balancing in traffic engineering is proposed in this paper. The new algorithm can well balance the traffic and converge more quickly when compared with current genetic algorithms. Design guidelines and advantages over other algorithms are explained in detail.

Abstract:Firstly, the definitions of modular operations, the relationship between intuitionistic fuzzy sets (IFSs) and their composition operations are introduced, then the definition of truncated set for IFSs is presented, and the principle for classification using intuitionistic fuzzy equivalent relations is reveled. The clustering algorithm based on intuitionistic fuzzy equivalent relations is discussed, so the basic theorems of IFSs are further generalized. Finally, a numerical example is given.

Abstract:Based on the genetic algorithm, a data fitness method is presented in this paper. And satisfactory evaluation values of parameters are obtained through coding the function parameters and many times of crossover and mutation operation. The experiment results indicate that this method is feasible and effective.

Abstract:A new method of computing bistatic RCS with Graphical Electromagnetic Computing is presented. The faces and edges, which are able to generate a diffracting field, can be detected by attaining the depth value of the faces of the targets relative to the incident direction and diffracting direction. The error of the Physical Optics field of edge, which is computed twice, has been corrected by using Physical Theory of Diffraction. The method of combining PTD with ECM is used in the disquisition. The result of using this method is the same as that showed in the documentation, which has proved that this method is effective.

Abstract:An evaluation formula is set up for the compared data of simulation model and prototype model based on grey interrelating degree. Another evaluation formula is proposed for normalization sequence that carries the information of model fidelity. Both model validation and model fidelity are solved by the formulas. The normalization's formula can be used to evaluate integrated simulation system. These evaluation models have practical significance in appraising the quality of modeling and simulation, as well as of the systems.

Abstract:To evaluate the military information system security effectiveness, which involves many factors, is a complex problem, in which the information about specification is incomplete and vague. In this paper, a grey evaluation system and a model based on the hierarchy structure for evaluating the security effectiveness of the military information system are proposed and the evaluation algorithm is introduced. In the end, the security effectiveness of the military information system is evaluated, which shows that the approach is simple and effective.

Abstract:Eliminating short cycles has been an important measure to improve Low Density Parity-Check (LDPC) codes performance, based on regular (n, 2, k) LDPC codes without short cycles, a constructing method of practical regular (n, 3, k) LDPC codes without cycle 4, 6 and 8 is proposed. The simulation results over AWGN channels prove the validity of the method, and the produced codes with girth 10 reach the outstanding performance.

Abstract:A method of describing quaternary cyclic codes with 4-cyclotomic cosets of modulo odd n and generator polynomials is presented. A necessary and sufficient condition under which a quaternary cyclic code containing its dual code is given, thus generalizing the related known results on self-orthogonal simple root cyclic codes and on BCH codes to al quaternary cyclic codes. Using the relation of simple root cyclic codes and repeat root cyclic codes, the linear quantum codes that can be constructed from quaternary cyclic codes of short lengths are determined.

Abstract:Using MgC3·Mg (OH)2·4H2O instead of MgO, the pure columbite phase is synthesized at 1100oC for 6 hrs, consequently the formation of pyrochlore phase is avoided in the second step calcinations process. Using (PbCO3)2· Pb (OH2 instead of PbO, the X - ray diffraction analysis is investigated for the precursor powders calcined at 650 - 1150oC for 2 hrs, the result shows that the main phase composition of the precursor powders is perovskite PMN -PT, and the PMN - PT solid solutions are continuously formed with the calcined temperature elevation, at the same time the tetragonal PbO phase is transformed in orthogonal PbO phase, whereas the pyrochlore phase does not arise in all calcined powders. Therefore, this synthesis technology of PMN - PT using (PbCO3)2·Pb (OH)2 is especially adapted to the condition of low temperature sintering of PMN -PT ceramics by using excess PbO as sintering aids.

Abstract:In Banach spaces, a generalized - variation inequality is introduced as an extension of the known or generalized meaning, i.e. as a generalized-generalized- variation inequality. Some properties, theoretical results and the solution existence theorem are proved, and its application is presented subsequently in the optimal field.