Abstract:This paper presents the control principle and method based on the equivalent throttling action of an aircraft arresting system and also presents the simulation of the arresting process by using this method. The result shows that the system based on the control method can arrest aircraft in different engaging conditions.

Abstract:According to the analysis of the digital weapon-control system of a certain type of military aircraft, this paper points out its function, its potentiality and feasibility to accommodate more weapons, which is of significance to the loading and charging of ordnance equipment, and to the transplanting of this weapon-control system into other aircraft.

Abstract:On the basis of the concrete modification of a certain type of aircraft, this paper presents a scientific analysis of the maintenance spare part reserve quantity of the aircraft according to the theory of equipment maintenance reliability and the maintenance decision-making theory, and determines the calculating models and method of the maintenance spare part reserve quantity.

Abstract:This paper analyses the principal factors that affect the effectiveness of weapon system based on conflict circumstance. According to the process of air defense missile's firing target, the paper also presents a mathematical model and describes in detail the corresponding method for the study on combat effectiveness of missile weapon system and simultaneously offers a reference for further studies in this aspect.

Abstract:On the bases of analysis of the fundamentality of C3I tactics situation assessment, this paper brings forward the function modules of command and guide C3I tactics situation assessment. Furthermore, the implement methods of these modules are also discussed.

Abstract:This paper presents a simple method of unvoiced/voiced classification based on combinatorial parameters, which decreases the overlap area of the characteristic probability density of the unvoiced/voiced speech signals. Simulations on computer show that the method is more efficient and robust than that of classification based on single parameter, and the design of the program is simple and concise.

Abstract:The speech recognition software Spark SDK, which can be developed again, is designed by Lernout and Hauspie company. And it is designed to provide a fast and easy way for the developers to add voice command recognition function into their application program. This paper introduces the method of realizing connected digit recognition by editing the function of professional words recognition and modifying the grammar rules of Spark SDK in radar intelligence oral-reporting system. The result shows that the recognition ratio is greatly improved.

Abstract:Aiming at the relative invariability feature extraction problem in the field of radar target identification, a method based on the wavelet transform is proposed. Through classification and identification of the one-directional range profiles of three types of aircrafts, the validity of this method is testified. Meanwhile some attempts are made in the area of applying the fuzzy neural network classifier to radar target identification.

Abstract:This paper presents a new method in estimating the direction of more signal waves under conditions of low signal-to-noise ratio and short data. Simultaneously in the paper first some reasonable assumptions are given, then the mathematical model is created. Through deduction the covariance equation of the signal and the character subspace are obtained, at the same time, the covariance equation of noise and the noise space should also be taken into consideration.

Abstract:Photoelectric detecting technology has been adopted to check to see if there are faults, knots etc. in the threads on the warping machine. Then, the signal to show the evidence of faults is not obvious but weak at the terminal because of the threads' rapid movement, vibration and of the strong light and electric interference in the site. In order to strengthen the sensitivity of weak signal in detection, measures such as dynamic detection, reduction of circuit noise, dual judgment, etc. are employed, thus the system's false ratio in detection is greatly decreased while its reliability is improved.

Abstract:The ultra wide band capability of the thick single pole vibrator antenna is studied with the method of moment (MOM) in this paper. The antenna's current distribution, input impedance, radiation direction patterns, the varying characteristics of voltage standing wave ratio (VSWR) with frequency are studied respectively. The results show that this antenna has a good ultra wide band capability. A thick single pole vibrator antenna, 50mm long and 5mm in diameter, fed with 50Ω coaxial line and with its base connected to an infinite large conductor plate, is designed at frequency f0 = 1.4CH z. The testing results are satisfied with the theoretical ones on the whole. And the ultra wide band capability is proved and verified in practical use.

Abstract:The research on PIM of the coaxial cable assembly is one of the important tasks for the modern high power communication system. In this paper, an equivalent model of the coaxial cable assembly is introduced. According to the model, the relationships between PIM produced by the cable assembly, the frequency and the length of the cable can be predicted, which is instructive for the specifications and proper use of the cable assembly in communication systems.

Abstract:To counter the problem that all the traditional Web database access solutions have the limitations such as weak platform insensitivity and poor expansibility, This paper presents a relational database access middleware model based on XML and ADO technology. This model makes up to some degree these limitations and has a wide prospect in practical application.

Abstract:Since TCP/IP shows less consideration to security, some shortcomings in security are in existence, which provides Hacker opportunities to attack network. This paper first analyses the typical fragility of TCP/IP protocol, then puts emphasis on the analysis of the common attack methods and finally provides some useful safeguard measures.

Abstract:This paper presents two methods of using FFT converter and correlated function to measure the phase difference between two periodical signals. And through practical application, it proves that the two methods are effective in measuring phase difference.

Abstract:On the basis of analyzing the test demand in the mode control system and intake control system of a certain type of aircraft engine, and through simulating the continuous variation of engine speed signal with PCL-818L card, this paper presents the operating principle of the card in generating the square wave, and introduces the development of its software and the driving program. The result shows that the method is effective and feasible.

Abstract:This paper presents a new model of the steady state analysis of variable displacement hydraulic pump which is called the invariable pressure and invariable flow model. By the new model, a variable displacement hydraulic pump is simulated by the ordinary hydraulic component with hydraulic resistance, abrupt pressure change and invariable flow. The variable displacement hydraulic pump exists as an ordinary hydraulic component in the system and needn't to be simplified as a boundary point when a system model is established in analyzing the steady state characteristic of a hydraulic system.

Abstract:General statistic analysis of reliability requires that samples drawn from the same population should be independently and identically distributed (IID), but the population of repairable system can not be kept constant. Aiming at the problem how to determine whether the samples are IID, this paper analyzes the test of IID samples and discusses the statistic analysis of reliability under IID and non-IID conditions by taking the mean life for example.

Abstract:Based on the traditional design of V-type belt transmission, the relevant parameters are thought as random variables. When the minimum number of the belt is expected, and no fatigue fracture or slip of probability is taken as a reliable constraint condition, the reliable optimum mathematical model of V-type belt transmission can be established and represented with examples in design. Compared with the traditional design, this approach is newer, more reliable, feasible and practical.

Abstract:this paper describes the basic principle of module search and the concrete method of using it to find out the principal module which influences the product quality. At the same time the paper also presents a concrete analysis in the light of living examples and accordingly proposes a better and reliable method of improving product quality.

Abstract:To meet the needs of designing four-bar mechanism and enrich the theory in design, this paper expands the method of designing four-bar mechanism by illustrating, and also presents some new methods and the whole process of each designing method on condition that the length of one of the three components ( i.e. rocking lever, crank and link) in the crank-rocker mechanism, the length of the mechanism frame and the angle of the rocking lever are given. The methods are of some value in theory and practice.

Abstract:Aimed at the two problems met in CPLD Emulation, i.e. the effectuation of division device and the pipeline, this paper conducts a study on them, analyses the deviation caused by the conventional methods and provides the practical solutions through the improvement of the emulation procedure, thus increasing the real-time emulation rate.

Abstract:Based on the air-dynamics elementary principle, namely dynamics similar principle, the Reynold's number is derived from the π theorem of the dimension analysis. Through analyzing the Reynold's number in different conditions, the formula for calculating the landing velocity and falling distance in perpendicular falling is derived.

Abstract:This paper studies out the solving method of characteristic equation of disturbance motion by using the exact solution of quartic equation, and discusses some problems needing attention in computer programming. Through numerical test of some typical model of flight disturbance motion, it shows that the above method has obvious advantages in studying the model of flight .

Abstract:This paper presents the fitting functions of the low-order multinomial with the help of inverse matrix, reasons out the relational expression of fitting recursion and finally offers the fitting characters. The above mentioned is a very effective method in project.

Abstract:In this paper the model of difference equations for a kind of deterministic multi-phase decision making system and the existence conditions of its steady-state solution are derived, and the steady-state solution is obtained. Meanwhile the method of determining the unknown parameters in the model is proposed. By using Markov decision-making method, the steady-state solution for corresponding stochastic model is given and the optimal adjusting strategy that makes the system operation attain the ideal state is proposed.

Abstract:The problem of transportation restricted in time in emergent military materiel supply is very important. In this paper, the problem of transportation restricted in time is discussed and the scheduling method in table is improved. By analyzing, adjustment of least cost is put forward and the concrete steps of solving this problem are given. Finally, the practical calculation shows that the method is feasible.