Abstract:The sound insulation analysis model is presented in terms of sound insulation theory and practical engineering for the sound insulation problem of flying thin shell with complicated configration and special organization. It is compared with the measurement of the simulated shell by calculation. The results showed that the presented sound insulation analytic method and the model are correct and feasible The calculation can be used to evaluate the sound insulation ability for flying structure.

Abstract:Based on the mass models of the liquid propellamt engine thrust system, an approach has been presented for the optimization of the locality arrangement of the bipropellant attitude control engines. The optimization objective function is the total mass of the smallest thrust system, while the restrictive condition is that the total efficient control impulsion and total efficient control impulsion moment are certain.

Abstract:high frequency instability in liquid rocket engine is simulated by the method of computational fluid dynamics. The gas controlling equations are described under the Euler coordinate. The liquid phase controlling equations are described under the Lagrangian coordinate. The turbulence model is κ-ε model of high Reynolds number. To assess the combustion instability, the sinusoidal pulse is put into the combustor. The calculated results are observed by the way of Rayleigh mechanism of sound amplification by heat release. The curve of combustion stability is plotted to various perturbation and initial droplet diameter.

Abstract:On the basis of defining the definite conception of enviromental contamination of the space Station, the contamination sources consist of self-contamination, plume contamination and partical cloud contamination according to the causes of contamination. The respective analytical modes for prediction of potential contamination that would be applied to developing simulation modular for external contamination analysis is presented with its own formation mechanism. For the more serious plume contamination, source overall disposal is suggested to construct a project of modular simulation together with modeling construction, alogrithm, numerical simulation of flowfields and the analysis of the effects of contamination to apply to space station design and to develop an applicable contamination control system.

Abstract:This paper, based on disscusing about the methods of evaluation and analysis of the comprehensive effectiveness of misile weapon system, studied the theory of evaluation and analysis of effectiveness, and introduced the evaluation and analysis model of the strategic missile's comprehensive effectiveness.

Abstract:Using the method of graphic simulation, this paper has mainly analyzed the performance of the direction control system of ALV (Autonomous Land Vehicle) based on vision navigation. The effect of the composed sub-systems on the performance of the whole system has been analyzed based on a large number of simulation results. The theoretical foundation has been provided for the system design.

Abstract:This paper analyses the relation between the cutting force and cutting depth in the course of belt grinding, builds the mathematics model of optimum cutting parameter to improve efficiency and intensity, and proposes the processing method for controlling griding precision of rotary thin-wall parts.

Abstract:This paper is concerned with accuracy analysis of ultra-precision machine tools. Accuracy analysis is very important in ultra-precision manufacturing in metal cutting as well as machine tools design. A workable method based on variational analysis is presented in this paper. Using this method, we deduce a mathematical model of our ultra-precision aerostatic marble machine tool. Its output accuracy is analyzed here. We also point out the source and explain the physical meaning of machine errors. Finally we discuss its potential application in the design of ultra-precision machine tool.

Abstract:The application of the theory of the transfer line with multi-conductors to the study of the high frequency transfer characteristic of the stator winding of electrical machines with losses considered is discussed. With this method, the effect of interturn capacitance and mutual inductance will be taken into consideration. Calculation results concerning a practical example agree fairly well with those measured within a wide frequency range.

Abstract:Color, shape and texture are the essential features for image and video frame processing in content-based retrieval. It is easy to obtain these features when the background of the image is simple. Once it becomes complicated color and texture, it is difficult to get such features. Two concepts, namely: relevance and focus-of-attention quoted from the computer vision can be used to locate and select the most related imformation in the image with a complicated background and the best matched image can be efficiently retrieved. In this paper we discuss these two concepts and discribe their roles in image retrieval, especially in the case of QVE (Query by Visual Example).

Abstract:An information fusion method based on the combination of BP neural networks and D-S evidence theory to recognize satellite and its companion decoy in the state of point target is proposed in the paper. A BP networks is adopted to recognize the patterns with the characteristics of infrared(IR) radiation at first, then the D-S evidence theory is used to fuse the results derived from the BP networks at different time. The result of emulatson shows that the true rate of D-S is much higher than BP, and the ability to reject disturbance and noise is raised very much.

Abstract:A target recognition approach based on multiresolution analysis is proposed, and tested on returns of high range resolution radar. Features of targets are extracted by computing the logarithms of the ratios of energies in adjacent scales defined by wavelet transform. With multiresolution analysis, the features are decomposed into the highpass features reflecting detailed structure of targets and the lowpass features showing the outline of the targets. A radial basis function neural network is applied for classification.

Abstract:In this paper, several statistic properties of order-statistic fitlters (OSF) have been proposed, and some properties of OSF have been analysised. The well-analytic distribution functions of OSF'output have been given. It is our major work to analyse the joint distributions of OSF'output. The independence of OSF'output has been discribed. All the analysis offers an analytic tool to process the noisy images.

Abstract:This paper makes a complete analysis of the characteristics of the parallel calculation of the arithmetic expressions on YH-F2 system, and advances the concept of nested level tree, together with the appropriate calculation pattern of the arithmetic expressions. This pattern takes full advantages of the parallel calculating abilities of YH-F2 system, and solves the problem of parallel compiling on YH-F2.

Abstract:We have developed the distributed intelligent management information system YHWG for the iron&steel corporations. This system is composed of the steel-variety-aid-designing-expert system, the refractory-brick-monitoring and diagnostic expert system, and the low-alloy steel & refractory lining management information system. Now this system has been in use in Wuhan Iron&Steel Corporation, and has made big profit for it.

Abstract:In this paper, three kinds of the rapid prototyping of netted-radar system, an object-oriented design are constructed. The first is a sensor/target class which is more easily extensible than many types of radars and targets. The second is a tracking algorithm class which allows a series of tracking algorighms to be used. The third is a fusion tracking-control display class that allows easy access to many of the performence measures for radars and evaluation and debugging of the tracking algorithms. At the same time, netted-radar tracking prototyping system has been developed on computer network platform of distributed Client/Server system. The prototyping system can efficiently track multiple-aircrafts in real time, and attain strict tracking accuracy. Furthermore the prototyping system allows achievment of some growing. reconstructing and reconfiguration capabilities in case of failure of one or more of the radars.

Abstract:For the non-coherent system FTA with repeated events, the cut sets matrix and non-intersect mininal cut sets matrix of non-coherent system are defined. Matrix transformation is applied to realize the former non-intersection of FTA. Hence, a new method is provided for sovling the complex non-coherent system and its NP problem.

Abstract:In this paper, a new method of dynamic fracture analysis of three-point bending beam with an edge crack is presented by applying the elementary bending theory of beam and the line-spring model. This method can simplify calculation, and the numerical results show that it has high precision.

Abstract:This paper presents shape-preserving algorithm, the cubic parametrical curve is constructed between two cosecute data points, the resulted interpolating spline curve is local, shape-preserving and G²-continuous.

Abstract:In this paper, We study the nonstandard hull (D)^∧ of the test function space D(Ω) and its properties, and give the structure of the elements in (D)^∧. Finally, We prove that (D)^∧ and D(Ω) are similar in their structures, and (D)^∧ is the strict inductive limit of a class of local convex spaces.

Abstract:regard to the linear model Y = XC +ε, E(ε) = 0, Cov(ε,ε) =σ²I possessing the prior information: E(C) = 0, Cov(C, C) =σ²₀I, This article gives a best method of selecting the principal components' numbers in the principal components estimate and presents an improved principal components estimate. Theoretically, we prove that the improved estimate is admissible amd that it is marked much letter than Least Square Estimate and is better than the principal components estimate in a sense of “average”error of mean square. Simulation verifies the inference above.

Abstract:This paper gives the resultant forces and moments, strain energy and the work of the external forces on the basis of the deformation theory of flexible body. In accordance with the principle of virtual displacement, the energy criterion of critical load is obtained and the equilibrium diffenential equations and boundary conditions of stability problem are derived. The formula is discussed and simplified.