Abstract:Some models that constitute the model base of the Aircraft Structure Battle Damage Assessment and Repair Decision Support System (ASBDARDSS) are presented briefly, and then the model base is built according to the requirement of ASBDARDSS. The work logic and the date operation procedure of the model base are analyzed, and finally the chief characteristics of it are given.

Abstract:In view of the actual demands and control strategy for different aircraft ground pressure refueling systems and by utilizing the idea of flow matching, three design methods are put forward for small aircraft and big aircraft, and mathematics models are established respectively. The techniques of the above design methods in concrete implementation are introduced. The design methods mentioned in this paper have been successfully applied to practice.

Abstract:Based on the definition of weapon system effectiveness, aircraft structural effectiveness is defined and the relationships among its relative elements are analyzed. Then the model for aircraft structural effectiveness is established. The contents of comprehensive design of aircraft structural effectiveness, such as availability, dependability, inherent capability, and comprehensive characteristics of effectiveness and cost, are demonstrated.

Abstract:The characteristics of static pressure changing at stage exits of a multi-stage axial flow compressor relative to the design points at several typical operating modes are investigated. On low-to-mid operating conditions, the pressure change at the rear compressor stages caused by engine operating mode transition is not as sensitive as that at the front compressor stages, so it's hard to detect compressor instability precursory signals through the conventional method of monitoring the flow parameters at compressor exit. Then, to improve the efficiency of compressor instability precursory signal detection, it's necessary to install sensors on the front compressor stages, which would be useful for the detection of imminent compressor instabilities at low-to-mid rotating speeds of engine.

Abstract:According to the theory of the multi-grid scheme, this paper puts forward a new multiple-grid scheme in the calculation of the diffuser grid flow field of NASA67, which is used with the combination of explicit time marching method, finite volume difference code and distributed body force. By using Navier-Stokes equations, Baldwin-Lomax algebraic turbulence model, finite volume method and Runge-Kutta time stepping schemes it analyzes the flow field of diffuser grid. The use of the multi-grid scheme makes the converging speed evidently increase. The calculation result tallies with the experimental result.

Abstract:Based on the operation rules and the technical characteristics of a certain type of guaranteeing equipment, MultiGen is utilized for building up an emulation model of the equipment and HCI of the testing process is realized by using real-time driving software Vega. Through the emulation of the guaranteeing equipment, the method and ways of guarantee training is improved, the loss of equipment and the waste of guaranteeing resource are reduced.

Abstract:The computing method of S / N under the active blanket jamming and passive jamming conditions is presented. The computation model of the single - shot kill probability of antiaircraft missile under the electronic jamming condition is built. The concept of anti-jamming improvement factor is introduced. The effectual jamming probability of deception jamming and the target detecting probability under the electronic jamming condition are analyzed. Finally, the computation model of the single continuous fire kill probability of antiaircraft missile under electronic countermeasure conditions is given.

Abstract:The analysis and evaluation of air - to - ground engagement effect is a kernel portion of the air - to - ground engagement simulation training system, and also is a very difficult problem. Through deep research, a method for evaluation of air - to - ground engagement effect is provided based on DIS / HLA simulation and sub - phase partition with weight. By using this method, two different air - to - ground engagement effects can be evaluated. This method proved to be practical and reliable in application.

Abstract:This paper presents a new method of multi-sensor tracking a maneuvering target in dense environment. In addition to radar measurement, the use of accurate angle data from an Infrared (IR) sensor is proposed to improve tracking performance. IR - integrated Multiple Maneuver Model PDA (IM3PDA) filter combines IR and radar sensor data. The performance of this method is evaluated in terms of tracking success rates and position estimation accuracy by computer simulation.

Abstract:An identification method of the target to be intercepted by a ground - to - air missile is discussed in this paper. The main idea contains every existent target in the target collection, establishment of synthesizing many factors from the radar. Through the sequencing model of the Clustering, the type of target would be decided for air - defense operational decision - making in the missile weapon system. Finally, a numerical example is given to show the rationality and effectiveness of the model.

Abstract:For the multi-class classification with Support Vector Machines (SVMs), a decision tree architecture has been proposed for computational efficiency. But by SVM decision tree, the generalization ability depends on the tree structure. In this paper, to improve the generalization ability of SVM decision tree, a novel separability measure is defined based on the distribution of the training samples in the kernel space, and an improved SVM decision tree is provided. The theoretical analysis and experimental results show that this algorithm has higher generalization ability.

Abstract:Adopting CPLD, the design aims at producing a multiplex data collecting timing signal, and the collecting data will be saved into the cache memory. The CPU could read the up-to-the-minute result at any moment. This paper presents a common method of producing a multiplex data collecting timing signal with CPLD by taking AD0809 for example. Finally, this paper gives a detailed discussion on the operating circuit in CPLD.

Abstract:Block data communicating technology can reliably detect digital data over fading HF channels. This paper proposes an optimum design scheme for the Linear Detector for block data transmission system on the basis of Gauss-Siedel Algorithm, by which the channel estimation and data detection can be accomplished by the same equipment, thus reducing the complexity of the system greatly. The simulation result indicates that the optimized BLE has advantage over the traditional BLE in performance.

Abstract:Due to the load-balancing and parallelism of parallel switches, high-speed arrived packets (or cells) with same destination will be spread into many low speed switching fabrics for processing. When these packets are sent to the output, their sequence cannot be guaranteed. This paper proposes a structure of Virtual Input Queues (VIO) and a scheduling algorithm named Sequence Keeping Round-robin (SKRR), and simultaneously evaluates the throughput and the average delay performance for this technique in theory.

Abstract:An improved watershed segmentation method in spatial segmentation is used. In the method the multi-scale morphological operator is used, which has very strong anti-noise capability to obtain the image grads and modify the processing element in conventional immerging model. As a result, the calculation efficiency is greatly increased and the over-segmentation is also restrained. By fusing spatial and temporal results the borderline is located and the moving foreground object is segmented.

Abstract:The formation of LFM stepped Chirp signal and the principle of synthetic high resolution range profile are introduced. A clutter cancellation method is put forward and then some problems about this radar system, such as the influence of helicopter vibration on imaging and so on, are analyzed in brief. Moreover, the synthetic range profile and the imaging results of real data are given in this paper.

Abstract:The simplification of PML application and programming realization are presented based on the PML structure and computing characteristics of the split fields in FDTD calculations. In the new idea of PML application, the PML doesn't need to be split into subsections to respectively compute the fields, nor the corners and the special edges, which spares computer memory and time effectively and practicably. At last, the verification of the idea is given through numerical examples.

Abstract:Taking the development and research of a certain type of aircraft radio altimeter as a background and using CPLD and VHDL hardware language, this paper designs and realizes a kind of Single-Double pole code switching circuit which can replace the original detecting function of the radio altimeter detector, finally gives out VHDL programmers and the corresponding time sequencing simulation waveforms.

Abstract:The detection of weak signal submerged in chaos is discussed in this paper. In classical statistic detection theory the chaotic noise is regarded as a random signal, which will greatly reduce the performance of signal detection. To improve the performance based on chaotic dynamic mechanism, by using neural network to establish forecast model of chaotic time series and restructure its phase space, and based on the neural network's powerful ability of studying and nonlinear processing and local predictability of chaos, the method of neural network prediction and detection weak signal in chaotic time series is proposed, the results of theoretical analysis and simulation indicate that the method is effective.

Abstract:The basic theory of interval number is introduced into the group Analytic Hierarchy Process ( AHP), and the expert weight coefficients are determined according to the cluster analysis principle, so a simple and convenient group AHP is obtained. The use of this new method shows that it is easier for the evaluation team to obtain impartial and reasonable results. A living example demonstrates the arithmetic application of the algorithm and the results are reasonable and accurate.

Abstract:(Pb0.95Sr0.05)\[(Mn1/3Sb2/3)x(Ni1/2W1/2)y(Zr1/2Ti1/2)z]O3 piezoelectric ceramics ( abbreviated as PNW - PMS - PZT ) are synthesized by traditional ceramics process. The effect of the content of Pb(Mn1/3Sb2/3 )O3( abbreviated as PMS ) and Pb(Ni1/2W1/2)O3 ( abbreviated as PNW ) on phase structure, dielectric and piezoelectric properties at indoor temperature is investigated in detail. The experiment shows that when the phase structures of all the ceramics specimens are of 100% Perovskite structure and εr、 tanδ、kp、 Qm和Tc ( and sintering temperature ) are taken into consideration comprehensively, the obtained ceramics with composition of X＝ 0.06, Y= 0.02, Z= 0.92 can be used for high - power piezoelectric transformer.

Abstract:A new-style wavelength tunable Er: Yb-co-doped fiber ring laser is proposed. The principle of creating laser in the ring cavity is analyzed by means of rate equation. Based on the rate equation model emulation experiment is made. The relationship between the output power and the length of Er: Yb-co-doped fiber is analyzed and the coupling ratio of the coupler is optimized.

Abstract:Based on discrete algorithm of propagation-rate equation, the ASE dynamic behavior of Er3+/Yb3+co-doped double-clad fiber amplifier under both continuous and pulse pumping is studied. The reason for different change of the ASE output power with time is analyzed as well. The results show that the time and output power value of ASE reaching steady state under continuous pumping depend on the pump power, and the increase of ASE output power corresponds to the decrease of the inverted population of Er3+/Yb3+. This study also shows that the length of the fiber under pulse pumping affects significantly the saturation of the forward ASE output power, but does not affect that of the backward ASE output power.

Abstract:In this paper, the singular integral is treated analytically, and a method to ascertain the attachment radii is proposed. A monopole is analyzed by the method provided in this paper. The calculated results agree well with those of the reference and the measurement respectively, which indicates that the analytical expressions derived in this paper are correct and accurate and the method to ascertain the attachment radii is efficient.

Abstract:Knowledge reduction based on rough set theory is one of the important methods of knowledge-acquisition. Comparatively speaking, the attribute reduction based on equivalence relation has been investigated in depth, however, there is less study of attribute reduction based on dominance relation, so, in the paper five kinds of knowledge reduction are defined. The judgment theorems and discernibility matrixes with respect to these reductions are established, from which the algorithms of discermibility matrix for finding these reductions are obtained. Finally, an example is given.

Abstract:A new displacement model of blunt cracks is constructed by using the local solutions. The new singular element at the end of a blunt crack is obtained, the new method for calculating stress intensity factors of blunt crack problems is presented. Solutions obtained by using the present method are in agreement with the theoretical solutions. The validity of the present method is illustrated by numerical examples.

Abstract:This text analyzes the structure system's impact reaction acting on nuclear explosion earthquake, designs a kind of isolation base supported by the laminated rubber bearings, which has a positive meaning in resisting the breakage and destruction brought by the explosion of nuclear weapon.

Abstract:Through analyzing plenty of decision analytical algorithms, an OLAM semantic task model based on the constraints is presented. The model can be utilized for analyzing the common characteristics of OLAM task and extracting the elementary operations, the basis of which is the semantic slices. The definition of semantic slices based on the constraints and the relationship judging methods of the semantic slices are given. The relationship among the semantic slices is the foundation of optimizing the OLAM transactions.