Abstract:The integrated fault diagnosis is an important technique and a development trend of implementing the reliability, maintainability and indemnificatory of material facility. This paper analyzes the architecture and the supporting techniques of integrated fault diagnosis investigated in the development of the new generation of operational aircraft in America. The problems need to be researched and solved for implementing the integrated diagnosis at the present time are also discussed. The problems to be researched and solved in our development of new operational aircraft are proposed.

Abstract:Based on wavelet packet analysis and probability density function analysis, the characteristics of signal fluctuation and probability density function distribution of the first compressor stator casing wall static pressure, which was measured during the throttling process of a certain engine, are investigated. It is observed that along with the gradual approaching of engine working point to the surge line, the fluctuation magnitude of the first compressor stator casing wall static pressure contents at several specific frequency bands will increase, and corresponding probability density function distribution will become wider. The observed signal characteristics can serve as an aerodynamic instability indication of the test engine during the throttling process.

Abstract:Based on the analysis of multi-aircraft coordination target assignment, an optimization mathematical model is presented. Then a genetic algorithm is applied to solving this problem, which is proved to be an effective algorithm in solving target assignment problems. Finally, the “good” gene is used in improving the efficiency of genetic algorithm. Simulation results show that the efficiency of the "good" gene is improved almost to sixty percent. The advantage of the algorithm is more obvious in multi-aircraft environment.

Abstract:As the surroundings of airports will have great effect on approach landing systems' guidance parameters, the increasing air traffic and the new buildings on most of the modern airports are of serious threat to the operation of navaid and landing system. So it is necessary to perform a theoretical analysis and a numerical simulation before every major construction activity on the airport or approach landing system's installation. In this paper, the numerical system simulations (NSS) for approach landing systems are discussed, including the purpose, the methods applied, the process flow of system simulations, and the frame of software system of NSS. Simultaneously an example is given.

Abstract:The largest Lyapunov exponents of the pressure signal between the stages of the eight-stage axial compressor of a certain engine is researched. It is presented that, taking zero of the largest Lyapunov exponent as the criterion of the stall of the compressor, the stage whose largest Lyapunov exponent first reaches zero is the stage of the first stall. Computational results demonstrate that the method can detect stall inception signal of compressor 0.2s before the start of deep rotating stall, and the third stage is the stage of the first stall.

Abstract:Congestion in air traffic raises safety concerns and causes excessive costs, so ATFM is a focus of world's attention now. Mathematical model is built for solving a type of ground holding problem that belongs to ATFM first. Then, a simulation is performed, and the result shows that the model is logical and feasible. Based on the simulation result, some researches on the parameters of the model are carried out.

Abstract:An optimal model of spare parts is set up according to modern stock theory and tradeoff between the cost of spare parts and the maximal availability of the materiel. The optimal allocation plan of spare parts is got by the optimal model with the constraints of the cost of spare parts, the objective of the maximal availability of materiel, reliability, maintainability and supportability of the materiel, and the ability of integration logistic support.

Abstract:Methods of comprehension for non-linear error in signals of sensors based on software are introduced. Through least square fitting, the error is greatly reduced, and the precision of the system is further improved. Finally, through an engineering example, the process of implementing the compensation for the non-linear error in sensor is described by using curve-fitting in engineering practice.

Abstract:Target assignment problem for maximizing the detecting and tracking effectiveness is a very important and difficult problem in multisensor management system. Manifold algorithms for solving this problem are discussed first, based on ant colony algorithm, a new method is put forward then. The algorithm simulation is given in the end, the result shows this new target assignment method is effective, especially for the problem of large scale target assignment this new method shows faster constringency rate and higher precision.

Abstract:The attitude matching transfer alignment is sensitive to the wing flexibility. If the model of the wing flexibility is fault, the Kalman filter performance of the attitude matching transfer alignment should be deteriorated. The H∞ filter is robust to the uncertain disturbance of the system. In this paper, the H∞ filter for the attitude matching transfer alignment is designed and the wing flexibility is considered as the uncertain disturbance measured in the attitude matching transfer alignment. Simulation results show that the H∞ filter for the attitude matching transfer alignment can accomplish the transfer alignment within about ten seconds and the accuracy of the transfer alignment can be less than five angular minutes without the model of the wing flexibility.

Abstract:In view of the positive and negative ideal plans, a comprehensive evaluation model of missile performance in tactic and technology is established, based on the gray correlation degree and taking regard to TOPSIS method. At the same time, the concrete course is illustrated during the analysis of the problem. Finally, the practical calculation shows that the model is feasible in evaluating missile performance.

Abstract:Taking the multi-aircraft cooperative air combat as a background and aiming at making combat plan, this paper builds intelligent decision command system by using multi-agent theory and technology, presents the system form frame, the function of each agent and their correlation, information run flows. At the same time, the way of assistant decision-making is analyzed.

Abstract:In this paper, the accelerated aging tests at several higher temperatures are carried out for a kind of RDX compound explosive charge used in a certain missile warhead. By statistical analysis of the test data, the shelf life distribution rule is studied, an estimate model for the shelf life is established, and the average value and the low confidence limits of the shelf life at storage temperature is predicted. Based on these the following conclusions are drawn: the shelf life of the warhead charge obeys lognormal distribution. At temperature 250C, its mean shelf life is 67.2 years, and the low confidence limit is 29.58, 23.06, 15.75 and 7.14 years at the confidence level 0.8, o.85, 0.9 and 0.95, respectively. The achievements obtained in this paper are of important value.

Abstract:A progressive refinement approach to maximum - likelihood estimation is proposed as a means of carrier synchronization. According to user's need, this algorithm can reduce the complexity of calculation without sacrificing the dynamic scope and the estimating precision. The performance of this algorithm in estimating dynamic scope precision as well as calculation complexity is given out in computer simulation.

Abstract:A systematic and in -depth research on the construction of Walsh function are carried out. The formula of constructing continuous Walsh function with Rademacher function is improved. A complete set of mutually transforming methods between the numbers of the discrete Walsh function and the row or rank numbers of Hadamard matrix is brought up and their relationship is put in order, thus building up a unified and corresponding relationship between the discrete Walsh function which is made from the row or rank of Hadamard matrix and the continuous Walsh function and constructing the discrete Walsh function, with the way of sampling, by continuous Walsh function.

Abstract:The effects of vibrations and atmospheric turbulence on the performance of satellite-ground optical communication links are analyzed. The results show that even the minimal pointing vibration and atmospheric turbulence still can dramatically decrease the communication performance.

Abstract:Common Data Link (CDL) is a new technology used for transmitting real - time information and data from aero platform to ground bases, ships and aircraft. The system structure of Common Data Link is described. In addition, several key factors are analyzed, such as communication range, block in transmission route, path loss due to bad weather and etc., and the Signal Noise Ratio is reckoned.

Abstract:Based on the new concept of advance thermal analysis and design for electronic equipment, the thermal behavior of the power components and the printed circuit board (PCB) in an opening cabinet are simulated numerically using calculation fluid dynamic method. Temperature values and their profiles on the face of PCB and power supply are obtained, and so are their spatial modes in cabinet. The results are discussed and analyzed, which provides a theoretical basis for optimizing and improving the thermal design of the electronic equipment. The research shows that the advance thermal design for electronic equipment, compared to the traditional one, is easy in operation, advantageous to optimization and of low cost.

Abstract:The principle of applying the decomposition and reconstruction theory of wavelet transform to eliminating the noise from UWB radar signal is analyzed, and the simulation is carried out. The result shows that this method is better in noise elimination. The effectiveness of this method is related to the characteristics of the target signal and jamming signal.

Abstract:Orthogonal wavelet packet transform can divide signals (images) into multi-levels and further decompose the high-frequency part that isn't subdivided by multi-resolution analysis, thus improving the resolution of frequency and then effectively extracting the specific frequency component. This paper deduces the basic principle of wavelet packet transform, provides remote sensing image fusion algorithm based on orthogonal wavelet packet transform. Finally, an instance is given, which proves the validity and superiority of orthogonal wavelet packet transform.

Abstract:This paper analyzes the PS mode configuration timing and configuration files of FPGA from ALTERA Company, presents a design thought of FPGA dynamic configuration based on PCI bus, simultaneously studies the dynamically configurable PCI adaptor card circuit, designs a configurable state machine and gives out the configuration flow.

Abstract:By analyzing the traditional aviation drawback-assay mechanism and based on Huffman optimization, this article shows a design of self-adaptation optimization method on the subject of "system of appearance school of portable intelligent aviation", presents a concept of single arm-two fork tree, and finally gives a structure algorithm of optimization tree and the examination algorithm from this tree as well.

Abstract:A new algorithm is presented for face recognition based on DCT and a multi-class support vector machine (SVM) model. The extracted features from human face images by DCT have major information that can be recognized. As a classifier, the SVM has its particular advantage in tackling small sample size, high dimension and etc., and is of high generalization and without need of priori knowledge. The results on ORL face database show that the DCT feature extraction method is effective and the SVM is superior to the nearest neighbor classifier in classification performance with the efficiency of the whole system improved.

Abstract:The fundamental notions and operations on Atanassov's Intuitionistic Fuzzy Sets are first introduced. Several extended techniques, i.e. those of max-min, arithmetic mean minimum, geometric mean minimum, correlative moduli and correlative exponents, for calculating the similarity on semantic match for intuitionistic fuzzy are proposed by making extensions of models for calculating similarity on Zedeh fuzzy sets with the emphasis on consideration of the effects of both the membership and the nonmembership. The applications are illustrated with examples, which further develops the approaches to calculating semantic matching degree on the intuitionistic fuzzy sets as an extension. Finally, intuitionistic fuzzy relations are investigated with the proof of a theorem on intuitionistic fuzzy similar matrix.

Abstract:A mixed genetic algorithm with the tabu search operator is proposed for multi-channel optimized target - assigning in operation of air defense. Both the advantages of tabu search algorithm and those of genetic algorithm are integrated into this algorithm. This algorithm avoids the shortage of global search capability of the tabu search algorithm, improves the mountain climbing capability of the genetic algorithm, solves the problem of being easily immersed in local optimization in the genetic algorithm and enables the search course to have a memory capability. The simulation result shows that the algorithm can effectively give a satisfied solution to the problem in solving multi-channel optimized target - assignment.

Abstract:According to the anatomy of the logistics supply chain at the emergent situation and the structure character of the emergent logistics, the concept and the basic model of Emergent Logistics System & Style & Substance (ELS) are advanced. ELS constructed on the base of logistics supply chain of country and enterprise is the special and integrated system pattern of logistics supply chain. It offers a sustain of decision-making at the time of emergent Real Time Logistics Supply (RTLS) and a new thinking way for the correlated research.