Abstract:In this paper, by combining mathematical models and the underlying physical systems, the concept of blown-ups introduced for the study of whole evolutions is elaborated deeply. Based on the analysis of nonlinear models, mathematical physics meanings and mathematical characters of blown-ups are provided . At the end, the concept of blown-ups is applied to the study of chemical chain reactions with existing mutual reactions between chains.

Abstract:According to the analytical method of reliability, the paper analyzes the survival probability of a single-airplane shelter under explosive load in the plain airfield for the third generation main fighting airplane. Based on this, the survival probability of single-airplane shelter group is studied, and its calculating model is given by introducing system engineering method.

Abstract:The size of large cement concrete slab is determined by airplane loads and temperature. Based on analyzing the loading stress and the temperature stress (including contraction stress and warping stress), a calculating method of the slab size is set up. The method has been adopted in the airport pavement engineering and is also proved to be correct after use.

Abstract:An experimental study of atmospheric pressure aberrance on the turbofan engine is presented, then a new rational method is proposed to test the engine stability which is influenced by atmospheric aberrance. The experimentation result has been taken as the basis of evaluating the engine stability and is of significance to the development and application of engines in our country.

Abstract:The Faver-averaged N - S equations and k - ? model are solved by using the finite volume method , and a numerical emulation is done for the micro-jet actuators in modifying the aerodynamic performance of a cylindrical body . The result shows that the aerodynamic performance of a cylindrical body is modified, and "low pressure recirculation region " produced is a root cause of the modification. And the calculating results are in agreement with the phenomena observed in the experiments of the documents.

Abstract:The dynamic model of a kind of Turbofan EEC ( Engine Electronic Controller ) main fuel passage belongs to nonlinear time - varying system, it is difficult to identify the model because of the singularity caused by disturbance of the diverse - structure response. Based on the theory of exception - checking and error - filtering of wavelet transform, the response data is analyzed and reformed, the singularity is obtained, and the characteristic of the dynamic model is identified by segment. The result shows that wavelet is applicable to the singularity identification, exception - checking and error - filtering without experienced knowledge of the procedure error.

Abstract:From purposes and clearance specifications of reserve runway, this paper points out the deficiencies in the airfield clearance regulations of reserve runway, and presents the composition of and the requirement for the reserve runway clearance area. At the same time, the paper studies the origin of emergency takeoff - landing or takeoff reserve runway's clearance specifications by using the theory of takeoff-landing path of aircraft.

Abstract:According to the demand of ground to air defense, the cruise missile is studied and analyzed for its infrared radiation characteristics in this paper. And the three aspects, i.e. airflow heating, feather flow radiation and jet nozzle radiation, are calculated, finally the calculated results and relative analysis are given.

Abstract:Usually the test of armament evaluation costs a large sum of money. Based on Bayesian theory, a small sample test to reduce expenses and improve economical use of the project is designed. Test load can be calculated by introducing binomial distribution in Bayesian formula. The influence of the number of additional test on evaluation can be analyzed at the same time. Furthermore, the normal route of variables and the risk of both sides can be further estimated. Therefore, a reference process helpful to evaluating pass-fail products is proposed.

Abstract:Lanchester fight theory is the classical theory proposed before high-tech weapons appeared. The problem how to apply the Lanchester fight theory to antiaircraft fight is discussed in this paper. The Lanchester equations for antiaircraft fight and a model of antiaircraft C3 I system are proposed based on the basic structure of Lanchester equations.

Abstract:In inertial navigation system, the error accumulation of altitude is unsteady, so the outside information sources such as barometric altimeter, etc. should be used to damp the accumulation. In this paper, how to design a net of altitude-damper, how to determine the parameters in the net and how to deal with the net in Kalman Filter of the integrated navigation system are discussed respectively by adopting the method of Monter-Carlo emulation to imitate the strapped-down navigation system and INS / GNSS integrated navigation system. And finally the actual result of the emulation is given.

Abstract:In view of the defect that a conventional low-resolution radar fails to directly resolve targets flying in formation in both range and azimuth, the radar echo signals of multi-targets in formation are analyzed for time-frequency characteristics. A method is proposed, which is used for extracting the sortie information from the formation target radar echo on the basis of smoothed pseudo - WVD distribution, and such a method is used not only for identifying target sortie number reliably, but also for resisting noise and interference. The experimental results illustrate that the efficiency of the method is superior to that of the conventional WVD distribution.

Abstract:The FPS model is put forward to remedy the problem in traditional knowledge representation. Based on this, a fuzzy rough set is defined for concept inductive inference, three measures, i.e. similarity measure, distance measure and entropy measure are defined for the object rank, then upper and lower approximations of concept are defined by using this fuzzy set method , and decision rules are achieved.

Abstract:Er3+/Yb3+Co-doped double-clad fiber amplifier pumped at 980 nm is analyzed for gain and noise characteristics based on the rate equation and light propagation equation. And the numerical simulation result shows that, under the conditions of both small and large signals, Er3+/Yb3+co-doped double-clad fiber amplifiers have good gains and noise characteristics within the range of 1520nm ~ 1570nm wavelength.

Abstract:In the design of structures, some unavoidable uncertainties must be taken into account. A procedure for the optimization of uncertain structures based on possibilistic reliability is presented in the paper. Some beneficial conclusions are obtained by contrasting it to the widely used traditional probabilistic ( stochastic) reliability based optimization. A practical numerical example shows that the results of optimization based on the two methods of possibilistic reliability and of probabilistic reliability are completely the same in the case of identical data information. This presents that both the possibilistic reliability model and the above mentioned optimization method are efficiency and feasible.

Abstract:For the purpose of beam shape remedy on smart antenna, a new beam form updating method is presented in this paper based on correlation matrix eigenstructure. After spectroscopic eigenvalue analysis, small eigenvalues under threshold are aborted to keep the robustness of eigenstructure spectrum. The computer simulation shows that, by using this method, the signal cancellation can be effectively inhibited and better beam shape with low sidelobe and fast convergence properties can be obtained.

Abstract:In view of the introduction to the basic concept of traffic engineering, the core technology in traffic engineering is studied systematically, and then difficult points, methods in calculating and selection of metric parameters are discussed deeply in constraint-based routing technology. And feasible further advances in the constraint-based routing are proposed based on the analysis of the existent problems.

Abstract:A Spice model is proposed based on the physical model of single-electron transistors (SETs). It consists of a voltage-controlled current source, a voltage-controlled voltage source and a voltage source. Compared with quasi-analytical SET model, the I-V property of SET can be shown accurately. The single-electron inverter is investigated and the unit device for Binary Dicision Diagram (BDD) is improved.

Abstract:With the introduction and analysis of two structures of Remote Fault Diagnosis system (RFDS) based on WEB, the study of Agent RFDS based on knowledge is made. A prototype of the RFDS is implemented, and the work process of this prototype is expounded in this paper.

Abstract:Inside leak and outside threat in store data have been analyzed in this paper. For the sake of preventing the store data from leaking and filching, by combining with IDEA (encryption algorithm), a store data encryption system is designed. This analysis shows that the system is provided with reliable security, nice key management for selection, good real-time characters and realizability.

Abstract:In Linear system，Fourier Transform（FT），Fourier Series（FST），Fourier Z Transform（FZT）and Discrete Fourier Transform(DFT)are used to analyzing and processing signals。In this paper，a new algorithm based on FT has been proposed by analyzing the relationship among FT，FST，FZT and DFT.The practicality of the algorithm is illustrated。

Abstract:By exploring the coefficients of the discrete Fourier transform (DFT), a method of DFT fast hardware realization by using CPLD devices is proposed in this paper. 8-point DFT realization by using this method takes about 200ns.

Abstract:Models are very important in product manufacturing. The models and simulation application to product manufacturing are classified in this paper, and the method of dynamics model finding is discussed in process of metal cutting. First, the signal of pulse response is obtained directly. Then, the input signals and output signals are processed by both low-pass-filter and high-pass-filter. Finally, the parameter is calculated.