Abstract:A dynamic meshes and CVT interpolated technology are developed to generate interface mapping for CFD/CSD coupling procedure. Computational structural dynamics (CSD) are modeled using finite element equations. Solving aerodynamic force employs Navier-Stokes discretized based cell-centered finite volume framework with dual-time technology. An aeroelastic coupling procedure will perform with loosing coupling CFD/CSD at the same physics time step. Finally, the CFD / CSD coupling computational convergence solution is obtained for a swept wing at M∞=0.8395，α=5.06°, using the developed nonlinear aeroelastic methodology.History of response of the structure and aerodynamic characteristic with time is analyzed. The study shows the developed CFD / CSD coupling procedure is able to compute nonlinear aeroelastic analysis.

Abstract:According to the basic theory of follower jammer, this paper proposes a scheme of High-speed HF jammer based on time-frequency analysis theory. This scheme can be realized in FPGA by SOPC technology. Through the analysis of capability and actual test, it can not only interfere the high-speed HF system at 2000h/s but also identify and follow the high-speed HF system at 1000h/s.

Abstract:According to the characteristics of the airport loading and traffic volume, the design control criteria based on the analysis of the cause of asphalt pavement damage is put forward, then, a large amount of calculation and analysis under the typical structure and loading is done. It is pointed out that the quality requirements for the asphalt pavement mainly refers to bearing strength instead of deflection. For the structure design, the cleavage stress of the semi-rigid base and that of the sub-base course are taken as the main design criteria. And it demands verifying the cleavage stress of the surface course under the low temperature. To some heavy horizontal loading areas, it also demands verifying the shear stress of the surface course.

Abstract:According to the conception of the forward sweep leading edge, this paper puts the design of forward sweep leading edge into the blade of NASA67 rotor. The Navier - Stokes equations, Baldwin - Lomax algebraic turbulence model, finite volume method and Runge - Kutta time stepping schemes are used in analyzing the effect on the performance of blade by the different forward degree of leading edge. The rather extensive computed results give three preliminary conclusions: (1 ) the efficiency of the forward sweep blade is higher than that of non-sweep blade; ( 2 ) the forward sweep blade can remarkably improve the stability and the scope of flux, and the influences are increasing with the increase of the forward sweep degree; ( 3 ) the pressure ration of the forward sweep blade is lower than that of the non-sweep blade, and the pressure ratio is decreased with the increase of the forward sweep degree.

Abstract:Squeeze film damper (SFD) - dual rotor system, widely used in aero engines, is investigated in this paper. A dynamical model about SFD - dual rotor system with spring support is set up, in which not only the forces between the high - pressure rotor and low - pressure rotor but also the nonlinear oil - film forces are considered. The model is solved by 7 - 8 order continuous Runge - Kutta method. The characteristics of nonlinear vibration and the forces between the rotors are got. These are useful in vibration monitor and fault diagnosis for aero engines.

Abstract:Interrelated theories of expert system and artificial neural network are applied to the thorough study of navigation attitude system failure diagnosis problem, and an integrated failure diagnosis expert system is established based on expert system and artificial neural network. By using this integrated failure diagnosis expert system, the failure diagnosis of a navigation attitude system is realized. The result shows that the neural network data error is 0.1 when training 10 times and 0.01when training 829 times which means an accurate identification of failure.

Abstract:This article particularly introduces the concept and study actuality of Embedded Internet. Through LWIP (Lightweight TCP/IP), Embedded Internet technology has been applied in the manufacture of the Embedded network communication equipment used in remote watch system for airplane equipment parameters. For realizing high reliability, low power consumption and cost, embedded system building blocks methods are adopted by using AT91FR40162 as its hardware's core and real time operation system core μC / OS - II in the original version of its software. It's laboratory sample having been realized, the equipment can be used in various fields on long distance data collection, data processing and transmission security.

Abstract:A comprehensive decision model of type proof for ground to air missile is established based on minimum average weighted deviation method, which is proved under the rule of system effectiveness, cost, development cycle and risk, and of whether objective weight is clear or not. The model provides a kind of quantitative analysis technology for type decision makers.

Abstract:Main factors influencing the laid-off of weapon equipment are analyzed. The models for estimating these factors are given. Using the method of fuzzy classification, the laid-off model of surface-to-air missile is analyzed which provides a quantitative analysis means for the decision on the laid-off of surface-to-air missiles.

Abstract:Considering uncertainties in realization of controllers, sufficient conditions under which the robust flexible controller exists are developed based on state feedback and in terms of the method of linear matrix inequality (LMI). A procedure for the design of flexible controller is presented. Different from the commonly used robust control method , in which the controller must be realized exactly, the controller gain obtained by the proposed method is at intervals. Therefore, when parameters of designed controllers vary in permitted ranges, stability and performance of the closed system can be assured, i.e. the designed controller is flexible, robust and reliable. A numerical example shows that the flexible controller designed by the presented method is effective, feasible and excellent in resisting the excursion of parameters of controller and suppressing the external disturbances.

Abstract:The full N-S equations are solved using Beam - Warming approximate factorization method for the synthetic flow field of Vectoring of a primary jet with micro-jet. The synthetic flow field is compressible, two dimensional, time-dependent, as well as viscous. The numerical simulation result shows the primary jet can be vectored and leaned to the micro-jet actuator as “pull” mode. The parameters of micro-jet effecting on the vectoring angle the primary, the distance from the micro-jet actuator to the primary, an angle of incidence, frequency, velocity and altitude are analyzed. The effect of an angle of incidence is larger than that of others. When an angle of incidence is minus, the primary jet is pushed to the other side. When the parameters are beyond the region, the vectored angle of the primary is smaller.

Abstract:There are always various types of entries in DT from complex decision problem of command and control, that is, entries with a continuous quantitative attribute, unknown entries or multi-valued entries, and the three types of entries often occur in the same DT. The DT with these entries named Continuous Uncertain Decision Table ( CUDT ) can not be analyzed directly by CRST. Fortunately, by modeling those three types of entries in CUDT with Fuzzy Sets theory, CUDT can be transformed into a special DT called Extended Decision Table ( EDT ) in which each entry is associated with a membership degree. An extended CRST based on this idea is proposed to transform the CUDT into EDT, and the lower approximations and the boundaries of decision concepts in EDT are also calculated by the extended CRST.

Abstract:Sufficient and necessary conditions for a generalized decision reduction is a relative reduction and a relative reduction is a generalized reduction are provided. In particular, a decision table in which the decision attribute has only two values is obtained, and its generalized reduction and relative reduction are equivalent. The results make it possible that the relative reduction is found based on generalized reduction and in a certain conditions, the generalized reduction is found based on relative reduction.

Abstract:To descry the long -range monitor video in manner of Browser/Server, this paper brings forward a stream-media promulgating system based on the B/S video surveillance, and presents the structure and rationale of its collecting, coding, stream-media promulgating, web server and terminal, then analyzes the promulgating process and transfers hierarchy, finally gives a bandwidth adaptive rate-control model and the realization scheme which is based on the detection of packet losing rate and used to resolve the conflict between the fluctuation of WAN load capability and the requirement of video real -time transmission.

Abstract:This paper analyzes the characteristics of the network management system and establishes the index system for evaluating the performance of the network management system with the combination of performance test. The concrete testing and calculating methods for performance index have been presented, in addition, comprehensive evaluation expert system is designed and applied to the management system of the real transmission networks. Through repetitive testing, the technology presented in this paper for evaluating the management system of networks has proved itself to be of good practicability.

Abstract:An Ad hoc network is a collection of wireless mobile nodes dynamically forming a temporary network without the use of any existing network infrastructure or centralized administration. A number of routing protocols have been implemented in this paper. An attempt has been made to compare the performance of two prominent on - demand reactive routing protocols for mobile Ad hoc networks: Dynamic Source Routing (DSR) and Ad Hoc On - Demand Distance Vector Routing ( AODV ). These simulations are carried out based on the ns network simulator.

Abstract:After the RPR ( Resilient Packet Ring ) protocol draft has been proposed, RPR promptly becomes a hotspot of research. But the special RPR chips are not commercialized. This paper proposes a design scheme of the RPR module using a NP which does not support the RPR protocol and implement a protocol converter. The protocol converter mainly serves the functions of RPR / Ethernet frame conversion and interface conversion. The structure and function of the RPR module are described and the implementation of protocol converter is discussed.

Abstract:Wavelet packet library contains many wavelet packet bases, which can handle the different components of signal. Therefore, by selecting suitable bases, the effective features of signal can be extracted. Based on divergence criterion and genetic algorithm, a method of selecting the best base is presented. The experiments using the sound signals of four kinds of aircraft are performed and the result demonstrates that the method is effective and feasible.

Abstract:The singular value decomposition of wavelet transformation module maximum value matrix is proposed. By using the obtained singular characteristic vector as the signal's feature, the features' dimension can be compressed and the computer auto-identification becomes easier and faster. The method also has the merit of time translation invariability. The simulation shows that the method is effective.

Abstract:The fundamental notions and operations on Atanassov's Intuitionistic Fussy Sets are first introduced, and the semantic matching problem of intuitionistic fuzzy reasoning is described with the emphasis on proposing the extensions of methods for computing the semantic distance and near compactness as the measurement of intuitionistic fuzzy matching degree and on investigating the extensions of models for computing intuitionistic fuzzy near compactness and semantic distance, such as Hamming distance, Euclidean distance, Minkovski distance and Chebyishev distance, etc. on both space of discrete and continuous domain. The techniques for transforming intuitionistic fuzzy near compactness or semantic distance into intuitionistic fuzzy matching degree are exposed.

Abstract:An algorithm for simulating switched networks based on nonlinear iterative method is presented. Using this algorithm, an algebra equation is transformed into an ordinary differential equation (ODE), and then the numerical method is used to obtain the steady state of the ODE. The steady state is just the root of the algebra equation. The commutation time can be evaluated precisely and exponential matrix can be requested by precise computation for transient analysis. Compared to the conventional approaches for algebra equation, the nonlinear iterative method is provided with wide convergence range, high precision, high efficient compare with other iterative methods and it has no need of using derivative in the course of iterative. The simulation results to illustrative example indicate the correctness and efficiency of the presented algorithm. It is a new thought to simulate switched power converters.

Abstract:The properties of equal-higher-power difference squeezing of multimode entangled state light - field composed of multimode complex conjugate coherent state, multimode complex conjugate imaginary coherent state and multimode vacuum state are studied by utilizing the multimode squeezing theory in decoherence. The results show that when some fixed conditions are satisfied the mixed entangled state light - field mentioned above not only has the equal - higher - power difference squeezing in one of the two quadratures but also displays the similar effects in the two quadratures simultaneously, that is called "two - sided difference squeezing". This is a newly physical phenomenon which contradicts the principle of uncertainty.

Abstract:The tolerance algorithm of stratified sequence for multi-objective stratified programming problems is improved. An optimal equilibrium value and some optimal equilibrium solutions are found out for every rank. The optimal equilibrium solutions of all stratified programming problems according to their priority - ranks are got, which is based on the tolerance payment of the superior to the subordinate. The tolerance payment sequence algorithm of optimal equilibrium for multi-objective stratified programming problems is developed, therefore, and Pareto optimum solutions to all the ranks within certain tolerance limits are obtained.

Abstract:Some methods of constructing a new iterative method by means of two auxiliary functions, z = g (x) and u (x) = f (x) eax , and difference quotient are introduced and discussed. Through selecting and adopting proper auxiliary functions and difference quotient in constructing some preceding iterative methods, a new logarithm iterative method is deduced and constructed. This method contains two parameters and is very good in adoptability.

Abstract:The general ordering principle in nonlinear functional analysis is generalized to random metric spaces and a random ordering principle is given in this paper, the random generalizations of Ekeland's variation principle and Caristi's fixed - point theorem are proved, many previous results are unified and generalized, and some new fixed - point theorems are obtained.