Abstract:A physical model of detonation wave propagation process in the detonation combustion chamber is developed on the diagram, based on this a performance parameter calculation method of the pulse detonation engine is made by applying characteristic method, the quantitative relation between performance parameters and structural parameters of the pulse detonation engine is obtained, and structural parameters design method of the pulse detonation engine is established. The calculation examples are used in the design and analysis of the structural parameters of PDE with different thrust levels, this provides theoretical bases for the design and application of pulse detonation engine.

Abstract:This paper proposes a design project of the dynamoelectric accelerograph control system of X-aeroengine oil pump modulator. It introduces the working principle and the design process of the control system, gives the connection between the angle displacement signalα and simulation voltage signal Ux, analyzes the process of computer controlling the step and realizes that the accelerograph knob controls the degree of accelerograph opening of the oil pump modulator. The experiment shows that the proposed design is effective in adjusting the degree of accelerograph opening and is of relatively high precision in adjustment.

Abstract:The compressor's aerodynamic instability problem of a certain turbojet engine in the process of the throttling operation was experimentally studied. It is observed that different auto-correlation functions of the pulsating components of the casing wall static pressure in the first compressor stage correspond to the different working conditions of the aero-engine. An eigenvalue “ μ”is then introduced to quantify the variation of auto-correlation functions. The value “ μ”is capable of reflecting some aspects of flow separation in the tip region of the first compressor stage, and may serve as an indicator of imminent aerodynamic instability of the compressor. Besides, it is promising to apply the auto-correlation algorithm to real time control.

Abstract:Parameters of aircraft maintenance support cost is analyzed, a new cost forecasting method based on partial least-square regression is proposed. The method can be used to analyze the principal elements and typical relativity in parameters, then to regress the principal elements, and it is effective and precise in analyzing multivariate data with few observations. The results calculated show that, compared with ordinary multiple linear regression, the PLSR method has higher accuracy in aircraft maintenance support cost.

Abstract:Timeslot assignment algorithm is one of the important technologies on ground-to-air data link in improving the communication efficiency of the system. In accordance with the characteristics of ground-to-air data link, the paper proposes a new algorithm---algorithm of bintree average allocation in the Block---to enhance validity of timeslot assigning of the moving users. The algorithm makes the management model more convenient, the uniformity of time interval better, and the denotation of the timeslot easier.

Abstract:In this paper, a method applied to performance evaluation for aircraft dynamic use based on fuzzy c-means clustering after data pretreatment is presented. The process of clustering-analysis and the result of clustering are described in detail by an example. This application result shows that this method is scientific rational and corresponds to actual situation.

Abstract:For the problem that the dependent variable has many independent variables and their sampling periods are also different, a predicting method is proposed by using synthetically the data analysis methods of support vector regression (SVR), multivariate regression and principal component analysis, etc. The method can be briefly described as follows: 1. Predicting with the independent variables which have dense sampling periods based on SVR, and then the results are synchronized to have the same sampling period with the dependent variable. 2. Amending the results by using another linear or non-linear method which includes SVR itself, with the rest independent variables which have the same sampling periods with the dependent variable. 3. In order to increase the predictive accuracy, three data processing methods (principal component analysis, standardization and normalization) are integrated. 4. Two approaches, error mean square line and small error probability, are also introduced to evaluating this synthetic method. By using the method, the mathematical relation between the aircraft's failure ratio and its anfractuous factors is first established. The results show that the method is efficient in predicting the aircraft's failure ratio. In the process of quantifying some influencing factors of the aircraft's failure ratio, the Pearson's correlation coefficient method is also adopted.

Abstract:Some challenges faced in weapon system maintenance of our army, especially of Air Force, are first introduced and a parallel test technology is derived in this paper. Great advantages of the parallel test technology are displayed based on the analysis of parallel test concept. And then various implement approaches of parallel test, their merits and demerits are analyzed in detail. In the end, several basic system archtectures of parallel test are put forward, which give some useful foundation work for the parallel test technology application in the future.

Abstract:For the disadvantage of tracking the soft failure of the residual test based on Kalman filter, this paper makes an improvement on the method by using the state propagator. With the aid of normalizing the residual vector with the normal distribution, each component of the residual vector needs to be tested instead of the whole of that. Thus a higher fault detection sensitivity as well as the capability of the fault identification can be obtained according to the presented method. The simulation shows that the method is effective, by using this method the fault detection sensitivity of the system can be improved to a great extent.

Abstract:Based on variable type of air defense missile technology criteria of each country, an inverse DEA model is established and applied to missile weapon system acquisition in order to calculate the variation of the missile acquisition fee when the performance criteria value waves under unchangeable condition of effective value, which provides quantitative analysis method for weapon system acquisition.

Abstract:According to the analysis of the importance of air defense area, an index system for the evaluation of air defense area is set up in this paper, and the fuzzy synthetic evaluating model is presented, the evaluating and sorting of the air defense areas can be done on this model.

Abstract:This paper focuses on the method of modeling the second repair subsystem of communication equipment based on coloured Petri net. By using this method, the coloured Petri net is applied to improving the original model of the second repair subsystem of communication equipment based on Petri net, which can conquer the deficiency in modeling based on the ordinary Petri net, subdivide the operation procedure of the system model, and help analyze the model and realize the simulation.

Abstract:The fundamental notions and operations on Atanassov's Intuitionistic Fuzzy Sets are first introduced. Both the operations on Intuitionistic Fuzzy Logic and the knowledge representation by it are described with the emphasis on proposing a symmetric synthesized technique for the truth of IFL propositions and defining the fundamental operations on IFL propositions. All kinds of approaches to computing the semantic matching degree on IFS, including those of near compactness, semantic distance, similarity and compound conditions match, are discussed. Finally, the essence of morality for conflict resolving over Intuitionistic fuzzy reasoning is expounded.

Abstract:The prediction of PIMP is very important in the research of microwave and RF PIM.The effects of PIM noise in devices or systems can be directly observed. Using the method of IM Microscope, many problems that can't be solved by other methods can be handled. In this paper,an improved method on the base of IM Microscope is described. The model of output signal amplitude and phase distortion is introduced and the detailed math models are presented. By using this method many measurements in laboratory can be reduced.

Abstract:Differential frequency hopping (DFH) is a kind of new frequency hopping (FH) technique. Based on the encryption principle of affine cipher, a frequency transition function of DFH is designed. This function is convenient for realization, easy in controlling the secret keys and also has more secret keys. The final results of experiment prove that the frequency hopping pattern based on this function is good in uniformity, so the system has high complexity and strong anti-attack features.

Abstract:A novel single-phase active-clamped power factor correction converter is presented in this paper. The operation principle and the circuit parameters of the converter are analyzed. The proposed scheme is verified on a 3kW prototype converter operating at 100kHz. Simulating and experimental results prove that this circuit not only realizes the ZVT controlled by the main switch and the ZCS controlled by the auxiliary switch, but also has a low current and voltage stress, meanwhile, the overall efficiency of the proposed converter is 92%.

Abstract:Based on stochastic time and fuzzy loss in war, the model of optimal path is constructed by dependent-chance programming and a genetic algorithm is designed. For solving the problems of the necessity - node, the special rules of coding, crossover and mutation are designed. Initial chromosomes are predisposed to improve the efficiency of algorithm. The steps of simulation to gain time and loss are presented. Finally, some experiments are performed and analyses are presented to verify the effectiveness of the algorithm.

Abstract:Mean square error approach is often adopted in classical adaptive beam-forming algorithm, nevertheless, the bit error rate is one of the most important parameters in a communication system. This paper proposes an adaptive beam-forming algorithm based on minimizing the bit error rate, and computer simulations demonstrate that the performance of this method is much better than that of the classical method based on MSE approach.

Abstract:With the rapid development of digital communication technology, the requirements for the services of mobile communication network become increasingly high. The 3rd generation (3G) mobile communication system will play an important role in the future. Because 3G network grows to an ever - larger scale and all the network elements (NE) are distributed in the network, it becomes an urgent problem to implement a network management system to manage all these separated network devices in a centralized way. This article gives the idea of how to design and implement such a system, which is called MEM (Mobile Element Management System).

Abstract:Realizing high resolution observation with low resolution instrument by continuous Hopfield neural network (CHNN) based on direct modulation technique is demonstrated firstly. The corresponding neural network model is applied and the result demonstrates that this method is feasible in practice.

Abstract:The problem that the testing sample capacity is small, and the testing intervals are not equal arises frequently in the project practice. In response to this kind of problems, a method of data processing of small-sample time series based on insert-data is put forward. Modeling ARMA (n, m) of delay-time of some type of starter combustor is made based on this method. A forecasting is carried out and a good result is obtained.

Abstract:This paper introduces the system structure and the realization method of inquisition and statistics information system based on the current trend and characteristics of web, and discusses the related technique as well.

Abstract:In this paper, the principle and the characteristics of pulsed laser deposition (PLD) technology is briefly introduced, the current research status of PLD and future application trend in the functional film are discussed in detail. The researches show that PLD is a new promising technique for growing thin films.

Abstract:A modified Spin - coating method for PZT thick film is introduced. In order to improve the properties, an organic macromolecule polyvinyl pyrrolidine (PVP), which has the hybrid effects, is dispersed uniformly into the sol-gel precursor solution of PZT. The films are coated by repetitive spin- coating and then annealed at a proper temperature. Then the microstructure and electrical properties are measured respectively. PZT thick films are of polycrystalline and perofskite structure.

Abstract:The analysis of the theory and simulation for the complicated and abundant chaotic dynamical behavior of a three-cell coupled QCNN have been done by using the polarization of a quantum - dot cell and quantum phase as state variables and parameter b as bifurcation parameter. By the practical numerical calculation the maximal Lyapunov exponents curve, bifurcation map and power curve are obtained. The results show that the route for the system response entering into chaos is quasi - period bifurcation and that the system only has one chaos region and there is no periodical window in the chaos region.

Abstract:The attribute reduction models of inconsistent decision table, based on generalized decision distribution function, are introduced and investigated. Rule extraction methods are given in the end.

Abstract:The paper proves the existence of the maximum Borel Point of algebroidal function with finite order in a unit circle.