Abstract:Green remanufacturing engineering is a new subject and promising ind. and simultaneously it is an inheritance and a development to maintenance engineering. The main aspects such as connotation, the course of development and key technology in green remanufacturing engineering are introduced in detail in this paper. The nano surface engineering is a key to the technology of green remanufacturing engineering. Some advanced technologies such as high velocity arc spraying, nano electric brush plating and nano antifriction self-repairing additive are studied to improve excellently the properties of antifriction, wear resistance and anti-corrosion of the component. The remanufacturing engineering is an important part of advanced manufacture engineering.

Abstract:Through the calculation of the flow rate distribution, wayside parameter and wall temperature distribution of engine flame tube under the conditions of high altitude and low velocity, the cooling characteristic of the engine combustion chamber is analyzed and investigated. The results show that, under the conditions of high altitude, the flame tube wall temperature of the same axial position is increased with the increase of Mach number; and the film cooling has a finite effective length of cooling protection, which makes the flame tube wall temperature distribute axially in a saw-tooth curve.

Abstract:The mathematical model for undercarriage load simulation system of a certain airplane is established in this paper. Nonlinear control law for system output torque to track aerodynamic load spectrum is designed, regarding the undercarriage position disturbance volume as uncertain parameter. System simulation is calculated. The result shows that load simulation system has a nice tracking characteristic by means of nonlinear control law, and the redundant moment brought by strong disturbance can be effectively restrained.

Abstract:In view of the complexity of the traditional method in flying distance computation, a method based on self-adaptive fuzzy logic system is put forward. A fuzzy model of flying-distance computation of a certain airplane is set up by using the fuzzy logic method and its parameters are identified by the error-back propagation algorithm and the least square algorithm. The experiment result shows that the model has the advantages of faster rate and higher identifying precision, and can be used in flying distance computation of a certain airplane.

Abstract:As frequency of flight mishap occurred has tendency and randomizing, this paper has adopted model GM ( 1,1 ) in combination with the forecasting techniques of Markov to prejudge the trend and conditions of the frequency of flight mishap. The prediction of annual flight mishap of world regular passenger transport scheduled flight shows that by using this grey - Markov model, the relative error of the prediction is smaller than the prediction error of the grey model.

Abstract:According to construction characteristic and the denaturalization feature of weak expansion earth, a design of parameters of weak expansion high fill earth shallow- layer strong ramming and the principle of consolidation treatment are discussed and determined. In accordance with the actual project, a simple, convenient and easy operating method used for determining main parameters such as ramming impact energy and ramming impact frequency, etc. is put forward. Shallow-layer mud consolidation settlement can be realized in a short time by using this method, thus the strength of the foundation is raised effectively, the allotted time of a project is shortened and the cost is reduced.

Abstract:The damage rule of aircraft structure material LY-12 CZ with projectile is tested and investigated by accelerating the 7.62 mm pill with the ordinary gun. Through the analysis of the experimental results, the conclusion shows that there is a linear relationship between the damage size and the cosecant value of pill velocity angle; the damage size is distributed in normal school. Simultaneously the damage mode and the mechanism are analyzed, and then a battle-damage degree forecast experimental model of LY-12 CZ is put forward in the light of LATDAM.

Abstract:The detective distance and the attacking distance of portable missile upon the cruise missile are analyzed and calculated according to the working principle of portable missile's guiding fusee and the radioactive characteristic of cruise missile. The calculation result is also presented.

Abstract:To counter the relativity, incomparability and grayness of radar system performance targets, by applying the theory of gray relational grade ( GRG ) system, a model based on the GRG-AHP is proposed to evaluate the effectiveness of radar system. Through analyzing the comparison of four types of alert radar with this evaluation model, the result shows that this model method is more effective than the fuzzy comprehensive evaluation method.

Abstract:Focus on the present management conditions of navigation equipment, the paper proposes a method of remote-monitoring for navigation equipment. The realization of remote-monitoring in the system is based on modem dialing. The composition of the remote-monitoring system and the design of software and hardware are described.

Abstract:The work pattern of V / UHF air ground tactical data link mostly is of fixed time apportion. So there exists a contradiction between user capacity and information update velocity. Increasing user capacity could make the information update velocity slow, and expediting information update velocity could cause the user capacity to decline. Aiming at this problem, and considering the demand of new generation air ground tactical data link, after analyzing the transmit requests of air - state information and direct -induct information, a kind of V / UHF air ground tactical data transmit scheme based on FDM - TDM is proposed. The analysis and experiments prove that by adopting this scheme the user capacity will increase 5 times more, and simultaneously the information update velocity is still kept speedy.

Abstract:The method of secure communication based on Spatiotemporal chaotic sequence is proposed, a method using spatiotemporal chaotic model to create spread - spectrum sequence is presented, and the problem of choosing a driving system synchronous sequence is discussed. Based on the above, a model of CDMA communication system is given. The result illustrates that the system possesses high security and stronger synchronizing ability and is easy to realize. In addition, by using only one or two discrete - line synchronizing chaotic sequences the system can be driven to work in multi-channel communications, thus the communication efficiency is enhanced significantly.

Abstract:In the Ka-band satellite communications, the Adaptive Forward Error Correction ( AFEC ) is an ideal fade countermeasure for downlinks. In this paper, the system scheme of AFEC as a fade countermeasure is presented; Taking the complexity of application into account, an adaptive concatenated codes scheme structured by RS code as an outer code and variable rate punctured codes as inner codes combined with interleaver is recommended. The adaptive concatenated codes as an adaptive fade countermeasure ( AFCM ) can meet 99.8 percents of satellite downlinks availabilities in most area of China. Finally, the application scheme to choose codes is discussed.

Abstract:In Multi-user DS - CDMA system user detectors produce a small residual carrier offset, based on the analysis of the receiver's model, an efficient estimation method of carrier offset is presented. Simulations on computer show that the method is effective, feasible and can be used to estimate the channel's response in DS - CDMA.

Abstract:An image coding method is introduced in the field of image engineering which is a new and efficient image coding technique i.e. Embedded zero-tree wavelet EZW image coding. First, the course of evolvement from sub-band coding to wavelet coding, including multi-resolution analysis and filter bank on orthonormal wavelet bases is described, and then the wavelet technique for image decomposition and the fundamentals on EZW coding. Emphasis on detailed analysis and illustration of EZW algorithm is given, including zero-tree, scanning fashion and the approach in implementing steps. Finally contents mentioned above are summarized.

Abstract:The formula of analyzing limitations caused by the amplitude and phase unbalance of quadrature double channels in radar to the improvement of factors stability is obtained by mathematical derivation. Amplitude and phase unbalance parameter K and the curves of limitations to the improvement of factor stability are presented through computer. Then, the influence of amplitude and phase unbalance of quadrature double channels in radar on MTI performance is analyzed. Finally, a better resolution method is proposed.

Abstract:H.263 protocol is described first in this article. The emphasis is focused on analyzing the performances and comparing the results of several main searching algorithms, then the coding simulation of motion picture is made. Finally, one of those searching algorithms, i.e. cross-searching algorithm, is simulated on the TMS320C6211 DSK board.

Abstract:In view of the feature structure of observed data, research is made to improve parametric spectral estimation. Based on linear prediction theory, an optimal method for reflection coefficient estimation is proposed and simultaneously the performance of the algorithm is also analyzed by adopting entropy spectral estimation. The above optimal algorithm is confirmed by computer simulation and has provided a feasible reference for engineering implementation.

Abstract:This paper analyzes the transient character of neutral point earth-free main line in single-phase earthing, and based on the analysis, designs a new model earth protector. The protector responds to both transient current and frequency which are caused when one of the main lines fails to earth, and it is a new protective means for neutral point earth-free main line.

Abstract:Automatic meter reading system based on GSM short message constructed by using GSM modem ( TC35 and GM18 ) is presented. In addition to the system architecture, the interface circuit of GSM modem and the design of communication software module are discussed.

Abstract:The factors influencing the battle effectiveness of the ground-air missile corps are synthetically considered and based on AHP method, the model of the corps is built up to evaluate the battle effectiveness qualitatively and quantitatively. Finally, an idiographic example is given to prove that the model is feasible.

Abstract:Two epidemic models with nonlinear incidence rate are investigated in this paper, and the threshold of the existence of various equilibrium is found. By means of constructing Dulac function and Liapunov function, the necessary and sufficient conditions that guarantee the global asymptotic stability of disease - free equilibrium and endemic equilibrium are obtained.

Abstract:In consideration of the factor that the energy of the induced current on a scattering object excited by a plane wave with a Gaussian pulse almost all concentrates on a finite time and frequency-domain, by expanding the response in time with Laguerre function, a corresponding frequency-domain response is attained by using Fourier transform. According to the characters of Fourier transform, the low-frequency and high-frequency responses determine the late-time and early-time responses respectively. In this paper, the early-time and low-frequency responses are generated through the use of a time-and-frequency hybrid method including MOT and MOM and they are mutually complementary and contain all the necessary information. So the whole response can be attained by simultaneous extrapolation in time and frequency domains. The electromagnetic scattering responses in the time and frequency domains of the ideal metal conductors are calculated and analyzed by using this method.

Abstract:According to the viewpoint of combination tope, any convex polyhedron can be composed of some simplexes , and both convex polyhedron and simplex are important concepts of programming theory, so it's necessary to find their volumes in some calculations. Aiming at this problem, a method for volume calculation based on matrix analysis is presented in this paper, and some examples are given to show that this method can be used to solve a class of volume problems in Euclidean space.

Abstract:This paper uses the basic theory of observation process for analyzing the posterior distribution, approaches the situation when two threshold observers get shrinking, and gives the error estimation of A/D transformer.

Abstract:Considering personal and incorporation's AHP - decision without capacity to carry out multi-experts' decision, the article presents "dispersion method" of deciding scale and comparison matrix in a rational way, which breaks through the traditional scale - research mode of pursuing pure math consistency and extends Saaty 9 scale standard flexibly, so the comparison matrix constituted by using this method can satisfy the consistency directly in compliance with decision - maker's own will.