To solve the problem that the layout for the Army equipment storage cannot satisfy the requirements of modern war,the authors,under the precondition of fully considering the section of the war preparation materiel requirements,establish a decision making model for selecting the sites to store war preparation materiel on the basis of mixed integer programming,and design the Tabu Search to solve it.The model is proved to be effective by means of a specific example.
To test and verify the hardware realizability of TDCS system and the good antijamming performance in practice,on the basis of the basic principles of transformation domain communication system and the relevant key technologies,the authors expounds the method of transceiver design,conduct a preliminary test of the anti-jamming performance of the system,and compare its anti-jamming performance with that of direct sequence spread spectrum system (DSSS) by way of constructing Labview+USRP-based transformation domain communication anti-jamming software radio experiment platform.Experimental results show that,compared with DSSS system,TDCS system has good anti-jamming performance and hardware realizability.
The tactic mobile ad hoc network is very important constituent part of the tactical Internet.This paper introduces three commonly used protocols of the MANET,designs the models of the device nodes and simulated-network,defines the parameters of the simulatedprotocol,builds the simulated scenarios of the three network protocols,and obtains the performance data of the network-simulation.The data analysis results have certain reference function for the construction of our tactic MANET.
This article investigates a Robin boundary value problem for a class of coupled systems of nonlinear fractional differential equations.By applying the Schauder fixed point theorem,an existence result of positive solutions is obtained.Then approximate solution of the boundary value problem by using Adomiandecomposition method is obtained.In addition,a numerical example is presented to demonstrate the application of our main result.
This paper takes the sunk oven with great depth used in trailer as its subject matter, builds CFD models of solids and air inside ovens with different locations of heating rods and vents based on principles of heat transfer,using three conservation equations of fluid,and conducts simulation tests for each model in FLUENT.Simulation result shows that,the oven,which has heating rods on both sides of the lower part and vents at the top, has the most reasonable temperature uniformity and air flow distribution, further more, its heat loss during door opening is less.Correctness of the CFD model has been verified by practical experiment.
The power quality of micro-grid is faced with a great challenge due to the fact that the capacity of the micro-grid is finite but more and more nonlinear load is used in the system.The inverter is very important to the whole system as the closest controller to nonlinear load.In this paper,a modified control strategy is proposed for the micro-grid inverter with rectifier load, based the traditional double-loop PI control.The results of Matlab/Simulink simulation prove the validity of the proposed strategy.
Basing on the brief sum-up of three basic models of depot-level maintenance services procurement of military equipment,the authors conduct an economic analysis of military insourcing model,civilian outsourcing model and PPP model and conclude that,when the three models are used,the efficiency of maintenance resources distribution is the highest but the relevant price is the lowest,and can improve the output of maintenance services costs and optimize the services of the military equipment depot-level maintenance.
This paper presents a method for the enhancement and extraction of small targets in image sequence captured in static explosion test,whose background is complex with numerous targets,interferences and small segments.Three-frame difference method is adopted to process the original image sequence to obtain the foreground image.Since the foreground image is heavily contaminated by noise,so the gray square enhancement method is used to increase the contrast between the noise and the target.The modified Otsu method is employed to obtain the global optimum threshold,and the segmentation of the foreground image is accomplished.Finally, morphological processing is performed,and the noise of the isolated points is eliminated,and the weakening of the target in the process of differential and segmentation is resumed.Through a series of processing, the extraction of fragments in static explosion test image sequence is completed,and the trajectories of the fragments are obtained.
Aiming at the problem of FAE leakage and volatilization in the storage process of the ammunition depot, the solubility parameters of different contents of acrylonitrile butadiene rubber were calculated by Small method and Fedors method respectively.By comparing the solubility parameters of nitrile rubber and isopropyl nitrate,it can be known that they can swell with each other and result in the volatilization of FAE through nitrile rubber sealing ring,and the cause of FAE leakage and volatilization can be determined.Then the effect of storage temperature on the volatile concentration of FAE was studied by using simple missile model and combustible gas detector.Finally, according to the analysis results, the corresponding suggestions and measures are put forward.
Traditional propagator algorithm using the matrix of linear operation to replace get noise subspace eigenvalue decomposition (EVD),to a certain extent,reduces the computational complexity,but the traversal search in the whole space spectrum still needs large amount of calculation,and, in the case of low SNR, the estimation performance is relatively poor. Therefore,in view of the airspace of one-dimension signal,the propagator of multiple image compression algorithm is proposed, and the new algorithm divides the whole airspace into multiple slices.The original noise subspace is mirrored by means of Hadamard transformation from a biopsy mirror mapping to another.By mapping the noise subspace and the orthogonality of the steering vector,true DOA and mirror DOA are obtained.Theoretical analysis and simulation experiments show that MIC-PM algorithm can greatly reduce PM algorithm computational complexity,and,at the same time,under the condition of low SNR,the estimation precision is improved.
To solve the problems like insufficient information on armored equipment fault and difficulty in predicting the equipment fault,this paper analyses the fault characteristics of the armored equipment and the support vector machine regression algorithm and establishes a fault prediction model by using the least squares support vector machine (LS-SVM),and the fault prediction model is verified by using local fracture failure data of a certain type of armored equipment inlet valve plate.It is proved that the proposed model can well predict the trend of the armored equipment fault.
This paper focuses on the problem of ground power supply equipment affected by high frequency electromagnetic interference (EMI)in the process of flight support, improves the design of the generator excitation voltage regulator on the basis of analyzing the reasons for EMI, which greatly enhances the regulator's anti-EMI ability.The electromagnetic protection effect of the improved circuit is verified through the simulation by use of Matlab/Simulink software.The simulation results shows that the electromagnetic protection improvement can attenuate the majority of high frequency disturbance signal,which proves the effectiveness and feasibility of this design.
With the application of information technology in various aspects of military training,it is of urgent need to build the air defense brigade equipment supporting simulation training system adapted to the information-based warfare.In response to training requirement,the authors propose five principles of the overall design,analyze the function requirement of the simulation training system,and suggest the structural and functional design.
In simulation training,the synthetic commander has an urgent demand for good communication support.The pass,delay and accuracy are the three important factors which reflect the effectiveness of communication support.Based on the analysis of the rules of cross network routing in communication networks,the model of information transmission through judgment is established.By analyzing the influence factors of the communication delay,the communication delay calculation model is built.Based on the analysis of the problem of packet loss rate,the information accuracy calculation model is established,and the calculation process of each model is analyzed.This study provides a method to calculate the effectiveness of communication effectiveness.
Soil triaxial test with its good performance has become indispensable in the soil test and numerical simulation of soil triaxial test can be combined with the laboratory test to save time and cost.The paper did the numerical simulation of triaxial test of normal consolidated saturated clay,the simulation results and test results have an excellent agreement.The research conclusion can provide reference to other numerical simulation of soil test.
Aiming at the risk in the process of loading and unloading ammunition in military air transportation support,the risk evaluation index system is built based on the theory of military air transportation loading and unloading support.By using the method of combining entropy and AHP,the combination weight is ensured.For the uncertainty and randomness of the index,the membership degree of every index is ensured based on the normal cloud model.Then the fuzzy comprehensive evaluation model of ammunition military air transportation loading and unloading support based on Entropy-Cloud Model is built,with the maximum balance of subjectivity and objectivity,and the new way of risk evaluation about military air transportation loading and unloading support is explored.Finally,the validity and practicality of the model are tested and verified in a case study.
The biggest difficulty in evaluating the equipment system's contribution rate how to build the evaluation index system for quantitative calculation.This paper proposes the underlying index assessment value unity and seven-class qualitative calculation,and it also adopts the discrete map and continuous function mapping method to transform the qualitative indexes and quantitative indexes.Based on the AHP and multi-layer weighted fusion method under the same criteria,it obtains comprehensive contribution value of weapons and equipment system.The obvious feature of this method is that the comprehensive value of system of contribution rate is limited between-1 and 1,and it is advantageous for the making of decision rules.The proposed method is suitable for the comprehensive contribution rate evaluation of army's weapons and equipment system in different category.
By use of the characteristics of chaotic sequencesynchronization,this paper proposes a chaotic sequence synchronization algorithm based on XFAST.The performance of the algorithm is analyzed and the simulation experiment is carried out.The experimental results show that this algorithm can realize the synchronization of chaotic sequence and also has anti-noise ability,which provides theoretical basis for solving the problem of synchronization in chaotic spread spectrum communication system.
This paper analyses the charging mechanism of spacecraft surface and its corresponding security risks,and on the basis of the analysis of the action process and damage of plasma and spacecraft in the case of manned spacecraft, elaborates on potential active control technology development and application,and predicts the development trend of spacecraft surface potential active control technology,and provides technical reference for further studies in this respect.
The maintenance resource supply during the wartime,especially when the capacity of resource supply is insufficient,the decision makers supply these based on experience without precise sorting,which causes problems of fuzzy dispatch and low efficiency of the conventional equipment maintenance resource supply.Aiming at these problems,the paper probes the concrete applications of the STT QFD theory to form conception about dynamic provisioning equipment maintenance,establishes the mapping matrix between the mission and the equipment maintenance resource.It provides support about the data analysis for prioritizing the equipment maintenance resource and can also lay the foundation for supply centre to precise echelon support.
