Abstract:The overhauling，rebuilding and enlarging of airport pavement often produce vast amount of waste concrete, the reutilization of the waste concrete is an important and worthwhile subject for study. This paper presents the research on the problem of how to take the waste concrete as a recycled aggregate in making up the airport pavement recycled concrete，which, at the same time, can meet the design and construction requirements of airport pavement project. By adopting the "double mixing" technique mixing high quality fly ash with high efficient admixture，and applying the absolute volume method and individual design method，the mix proportion design of pavement recycled concrete is optimized. The indoor testing results show that the pavement recycled concrete is superior to the common pavement concrete in performance and the workability meets the design requirements. The compressive strength and flexural strength of this pavement recycled concrete are higher than those of the ordinary pavement by 1%-7%、4%-11% respectively. The recycled concrete made in field is good in workability and application effect, and easy to pave in constructing, the 28 days' flexural strength are all higher than 5.5 MPa. So the recycled concrete can be used in military airport pavement construction，also has important military，economical and social benefits.

Abstract:In view of the solid propellant aging which influences the performance of long storing solid rocket engine, the main factors of the solid propellant aging are discussed and the solid propellant aging mechanism is analyzed from the influence of the component of solid propellant, environment humidity and storing temperature. Then the methods of predicting solid propellant aging study are analyzed and reviewed, and the emphasis is put on analyzing the methods of mechanical properties, activation energy, gel content, Fourier infrared spectrum analysis and dynamic mechanical analysis. And simultaneously the main content of these methods and the reliability of these results are analyzed. Finally the developing trend of solid propellant aging is prospected from investigating the mechanism of solid propellant aging and the application of modern analysis equipment.

Abstract:Numerical simulations of three dimensions two-phase flow field of tail-pipe SRM under spinning condition are carried out. The differences of the particle trace and particle concentration along the wall of tail-pipe nozzle between the different diameters 10 μm, 40 μm, 70 μm,100 μm and different spinning velocities 0, 100 r/min, 300 r/min, 500 r/min, 1 000 r/min are studied. The results show that:①In comparison with the particle movement trace and particle concentration distributing rule under the no-spinning condition, the particle movement path and time are increased and the change of particle movement rule is obvious under the spinning condition;②With the increase of the spinning velocity, the movement path and area of particles and residence time are increased;③With the increase of the particle diameter, the particle residence time is shortened because the particle inertia has more effects than the trend to revolving effect;④With the increase of the spinning velocity, the particle concentration in surface of conocyl grain is increased, and the particle congregation area is transferred from the fin top to the root of finocyl grain. The particle concentration is reduced in axis of flow path with the increase of spinning velocity.

Abstract:According to the load-bearing characteristics of flexible materials, a universal design method for inflatable wings is proposed based on the design conception of approaching the general airfoil to its serial inscribed circles, which is applicable to both symmetric and asymmetric airfoils. Taking the non-symmetrical airfoil Eppler 398 for example, the design process is illustrated through the combination of programming and graphics. An inflatable wing model manufactured on the basis of this design method accords very well with the blueprint, which shows that the design conception is correct. A bending stiffness experiment is carried out upon the inflatable wing model, the experimental results indicate that this kind of inflatable wing is good in bending stiffness and can be used to replace rigid wings as long as the internal pressure is large enough, thus the feasibility of the design method is verified.

Abstract:The rule of in-flight hose-drogue movement is an important prerequisite in analyzing the aircraft's flying qualities and control law, and the calculation of the static catenary shape of hose is the basis of studying the hose-drogue movement. In this paper, a method for determination of hose static catenary is presented. The tanker flow-field is modeled by using an array of distributed bound and free vortices. The refueling hose flow-field model、hose pneumatic model and drogue parachute pneumatic model are established respectively. In the method, the trailing refueling hose and drogue are modeled by using an array of discrete point mass nodes which represents the physical properties of the hose and drogue. Hose static catenary shapes at various speeds and heights are calculated and discussed，and the results coincide with the facts.

Abstract:To solve the problems that some objects' attributes contain preference information and noise may exists in the objects' attributes or the attributes are incomplete, based on the analysis of traditional rough sets theory, a dominance variable precision rough sets method is put forward and the concrete steps of the dominance variable precision rough sets algorithm are given. According to the UCAV's combat characteristics, the algorithm is applied in the process of UCAV's threat assessment. A decision-making information system of UCAV's threat assessment based on the dominance variable precision rough sets method is brought forward, which is demonstrated in an example. Condition attributes and decision-making attributes in the decision-making system are also given. The result shows that the algorithm is a good solution to the problems above and the threat grade of the target is assessed properly. Decision-making rules are obtained with certain credibility, which ensures the consistency of the rules. Regarding the decision-making information system with preference attributes, the incompatibility among the rules can be distinguished by using this method.

Abstract:The finite and infinite horizon stochastic linear quadratic optimal control algorithms for discrete-time Markov jump with multiplicative and additive noise system are presented based on Bemllman stochastic dynamic programming. And an optimal control is studied when the noises are correlated. The solution to the controller boils down to solving a set of algebra Riccati equations. The algebra Riccati equations include the noise covariance matrix which describes the effect of the noise on the controller, so the performance of the system is improved. Finally, the simulation results show that the performance of the system with the controller in this paper is better than that of the nominal system.

Abstract:The queuing theory is applied to calculating the intercept efficiency of the mixed multiplayer disposition. Taking a three multiplayer disposition for example, based on some hypothesis and using the queuing theory, a model of intercept efficiency of a three multiplayer disposition is built. First, the intercept efficiency of each layer is calculated, based on which the total efficiency is got, and the penetration probability of the cruise missile is calculated. Finally, an example is given to verify the practicability and feasibility of the model. This method can be used to calculate the intercept efficiency when disposition schemes are given, it can also be used to get the disposition schemes to meet an intercepting efficiency. This can provide a reference basis for making and implementing the disposition schemes, and simultaneously provide some relative information for the commander in decision making.

Abstract:Firepower distribution is a key link in the surface-air warfare. The fire distribution model and the efficiency of solving it all will affect the result of the air defense warfare directly. The fire distribution model is proposed based on the research of the air defense warfare. The penalty function algorithm is used to simplify the fire distribution model, and the differential evolution algorithm (DE) is introduced based on analyzing the strong point and weak point of it. According to the efficiency and the robustness of DE, it is meaningful to introduce DE into solving the model of fire distribution. An example is given to simulate and analyze the firepower distribution model of surface to air missile based on the differential evolution algorithm. The result shows that the algorithm is of fast convergence, strong robustness and high implementing efficiency in solving the problem of firepower distribution of surface to air missile. So DE is an effective method in solving the firepower distribution model of surface to air missile, and also it can be applied to other problems.

Abstract:This paper investigates the synchronization of digitalized DSSS receiver in high-dynamic and Extra-low SNR environment, presents and realizes the methods of direct P-code acquisition in GPS. This paper introduces several conventional code acquisition methods and the reason why they are not fit for direct P-code acquisition. In the precondition of good cross correlation and partial autocorrelation of P-code, a direct P-code acquisition scheme based on Unsymmetrical FFT is proposed and realized in FPGA. Compared with the conventional slipping correlation method, the time of direct P-code acquisition scheme based on Unsymmetrical FFT is reduced by more than ten times and the calculation is reduced rapidly. It's useful for other direct long PRN codes acquisition.

Abstract:On account of the changing of permittivity along with frequency, it is necessary that the dispersion of rough land and sea surface should be studied. Based on the study of dispersion of land surface, a novel model including the bound water is presented by comparing the dispersion of bound water with that of free water. The relationship between permittivity and frequency is studied, and the result shows that the model is more preferable than the Dobson's. On the other hand, a modified model for the permittivity of sea surface is presented by comparing the single and double Debye models in relaxation law. The dispersion of sea surface is studied, and the relaxation frequencies are analyzed at different temperature respectively. The results show that it is the second relaxation frequency that obviously expands the effective range of Debye model, which confirms the validity of the new model.

Abstract:The electromechanical actuation system is the last link for completing all the task operation in the modern airplane, and its working condition directly influences the flight safety. According to the characteristic that the fault information of different components of the aircraft electromechanical actuation system is in different bands, a new pattern recognition method of fault diagnosis based on "energy－fault state" is proposed. First the original signal is orthogonally decomposed into different bands by wavelet packet transformation, and the target fault features are extracted by the chosen eigenvector. Then the mapping relation between energy and fault state is obtained, which can be used as the judgment of fault degree through the comparison with the standard sample of the corresponding eigenvector. Finally the paper verifies the correctness and effectiveness of the method by the simulation example of the fault diagnosis in inter-turn short circuit

Abstract:This paper is about a research on hop routing tree protocols in a large wireless sensors network. We propose a balance convergecast tree algorithm (BCT) based on heuristic algorithm. The BCT combined with channel multiplexing can be used to save time efficiently on collecting data. It can help decrease the degree of data accumulation, save data collecting time and delay the time of the network interruption. This method includes a channel allocation system for raising degree of transmission node synchronization that can enable node to combine and allocate communication channels to transmit data with the shortest communication timeslot and limited code. The use of BCT can improve the level of synchronous transmission and accelerate the material collecting speed on network by saving material pausing time on node. The simulation results show that the use of BCT can collect data more rapidly and also prolong system's lifetime, meanwhile prove that the load balancing tree can greatly enhance the convergecast tree working efficiency for collecting data.

Abstract:An index system of air force communication capability is established by using Analytic Hierarchy Process (AHP) principle, and an evaluation model for air force communication capability is proposed on the basis of Index Scale and Gray Theory. In this model, the weights and confines of indexes are made certain based on Delphi method and Index Scale, then the data of indexes are whiten with the help of triangle whiten function, and the integration clustering coefficients of air force communication capability are calculated. The rationality and efficiency of the model are verified through experiments, which provide new ideas and methods in evaluating air force communication capability.

Abstract:In this paper, we establish the yoyo structure for each general system. Analogous to the important role of Euclidean spaces in modern science, the introduction of this yoyo model makes the research of systems science possess its very own intuition, system of methods and logic of thinking, which provides a methodological guarantee for the further development of systems science. After we justify the appearance and existence of such a model, we apply this model to generalizing Newton's laws of motion for the purpose of being able to apply these laws equally in natural and social sciences.

Abstract:A one-parameter single-frequency family of dark electromagnetic pulses that can propagate practically without being disturbed is obtained by performing extensive numerical simulations. The dark electromagnetic pulse related close to the solutions of the coupled nonlinear Schrdinger equations in one-dimensional LHMs is stable when parameter is lower and unstable when parameter is higher. With the same simulation conditions, the split dark electromagnetic pulse will become stable again by adding a frequency perturbation to the pulse, simultaneously appears a phenomenon that the velocity of the dark electromagnetic pulse becomes slow (or fast). This result provides a method for controlling the dark electromagnetic pulse split and its velocity in the coupled Left-handed Materials.

Abstract:The algorithm called linear efficiency coefficient for cooperative games within each team in multi-team game systems is introduced to prove that the optimal solution is a non-inferior solution for cooperative game which implies a certain weight vector within each team. By this result, a single objective parameter programming for the cooperative games within each team is developed. The solution of this programming is not only a non-inferior solution but also a strategy superior to Nash equilibrium strategies for all the players within each team. An iterative algorithm for solving non-inferior Nash strategies between the teams is proposed using the non-inferior reaction sets of the teams. The algorithm contains the advantages from literature \[3\], and simultaneously overcomes its disadvantages. The solution derived from this algorithm is superior to that from literature \[3\]. Finally, an example is taken to verify the effectiveness and the correctness of the algorithm, and the results obtained in the paper will enrich the multi-team game theory.

Abstract:In order to overcome the difficulties of ANSYS finite element analysis (FEA) on complicated and large-scale structures, the computer aided design (CAD) software UG and the FEA software ANSYS are combined together. The practical model, finite element model, material property, load and restricting condition are accomplished in UG software. Then the solving file is created and put into ANSYS software to operate. The results show that the use of the method presented in this paper brings into full play the merits of UG software in building models and the powerful superiority of ANSYS software in algorithms. The method makes full use of the modifiability of the solving file and the openness of the ANSYS software, which integrates the feasibility of analysis with the calculation precision to the utmost. Thus, the method proposed in this paper opens up a new way to FEA for complicated and large-scale structures.

Abstract:Entrance is the keystone part of a tunnel and is very difficult to be protected. The dynamic finite element program is employed to simulate the explosion shock wave propagation in typical wall-arch tunnel with uniform section. Some parameters are simplified via assumptions. In course of a numerical simulation, the shock wave pressure value in the tunnel rises to the maximum straight in a moment. Then, due to the reflection back and forth along the inner surface, multi-peak appears, which is different from the ideal shock wave by exponential decay in the free atmosphere. More, the outdoor large-scale model test is tried on with the similar ratio as 1/5, including three-level quantities 0.8kg, 0.6kg and 0.4kg TNT. It further reveals the pressure propagation laws in the tunnel. And at the same time this article gives the fitting empirical formula of the peak pressure by dimensional theory according to the measured test data. The result shows that the fitting test is consistence with the numerical simulation and other empirical formulas.