Advanced Materials Research Vols. 121-122

Abstract: Wheel/rail rolling noise is the main source of noise from railway operations, it is at least as important as aerodynamic noise. In this paper, the makeup of unit modules of CAE(Computer Aided Engineering) simulation platform for of railway passenger car and its function frame are given. Based on finite element method, boundary element method, the structural model, interior acoustic cavity and acoustics model of electric locomotive wheel were analyzed by Nastran and Sysnoise software. This paper is imposed sinusoidal excitation on the wheel, and then the laying of the viscoelastic layer and optimization of damping-wheel, obtain the wheel’s structure of the vibration noise radiation.The analysis result shows that the laying of the viscoelastic layer can reduce wheels radiation noise, and the noise can be reduced from 0.27 to 8.62 dB.Practical application indicated this simulation platform can supply effective technology support for the development of product.

Abstract: As various types of geo-environmental monitoring image instrument are sprouting up, there are more and more materials based on infrared, visible light, dim light, remote sensing image, using various types of image data to improve detection accuracy and efficiency of the environment has become a focus for environmental technical personnels. From the perspective of information fusion, as well as comparing framelet and the traditional wavelet features, the environmental image fusion algorithm based on framelet transform is proposed, by choosing suitable integration rules in different directions, the amount of information is further improved. The experiments show that this algorithm has better effects for small target detection with infrared and visible light images.

Abstract: In the field of hydropower project, the overabundance of information from multiplex data sources has forced managers and decision makers to spend much time dealing with information they need. Therefore the research on project simulation system is quite necessary. If system can provide some construction plan and schedule of the project properly, it will greatly improve the effectiveness of the plan. After the analysis of specific projects’ process and demands, this paper puts forward a visual simulation solution to large-scale hydropower construction, which including visual simulation model, design of algorithms and system implementation. Based on SOA structure, the optimization model and the simulation results’ 3D visualization are provided and a virtual three-dimensional world of the complicated coordinal construction process is proposed, with the advantage of direct viewing and real-time interactive, facilitating effective technical support for the decision of project construction design, and greatly enhancing the information level of design and organization of large-scale hydropower projects.

Abstract: By terms of extracting quantization values of each index making contributions to classification, this paper defines index classification weight; and also defines class representative points, weighted distance between samples and representative points; provides an iterative algorithm of searching class representative points, establishes a supervised clustering method based on representative points and it is apply into Fault diagnosis of Diesel Engine.

Abstract: The permanent magnet synchronous motors (PMSMs) may have chaotic behaviors for the uncertain values of parameters or under certain working conditions, which threatens the secure and stable operation of motor-driven. Hence, it is important to study methods of controlling or suppressing chaos in PMSMs. In this letter, robust stabilities of PMSM with parameter uncertainties are investigated. A novel asymptotical stability criterion is established. Some illustrated examples are also given to show the effectiveness of our results.

Abstract: A multi-policy access control model is proposed, with the model, access control based on policy regulation and XML based policy description is given. In order to describe the algorithm, we discussed the categorizing, adding, editing and canceling policy. For policy selection and decision, through fossilization and analysis of role, popedom and security policy, fuzzy algorithm is introduced for judging of user popedom. As the analysis reveals, this model can support multiple policy coordination of current models.

Abstract: Segmentation is fundamental step in video surveillance system. It is hard to segmented interesting object in all environments due to the similarity features of objects and background. The segmentation results (foregrounds) are often broken. An approach composition of some methods including GMM, removing cast shadow, clustering and segmentation broken detection and recovery is proposed to improve the segmentation results. This method is suitable for the applications that the information of bounding boxes is required.

Abstract: This paper analyses exergy of the components of the mine water source heat pump. Evaluate the exergy efficiency and exergy loss of main components of mine water source heat pump. An example that is calculated and analyzed shows that the compressor is the main energy-saving target.

Abstract: A large number of cooling water exists in chemical plant, use water source heat pump and lithium bromide absorption heat pump system to achieve water cooling instead of cooling tower, at the same time, extract heat for building cooling and heating. Respectively introduced the summer cooling system and winter heating system, and a feasibility analysis was carried out. The conclusion is get: water source heat pump system and lithium bromide absorption heat pump system for cooling water waste heat recovery is certain feasibility; the environment optimization can be achieved in chemical plant, at the same time, energy conservation and emission reduction is realized.

Abstract: Based on the Gram-Schmidt orthogonalization method utilized for pattern synthesis of linear array without constraints, null derivative constraints are proposed to implement pattern synthesis with broad nulls. The advantage of the simplified computation resulted from steering vector orthogonalization in unconstrained orthogonal approach is maintained, and the uniform or non-uniform linear array pattern synthesis can be realized by this method. The experimental results show that the null constrained orthogonal approach can fulfill linear array pattern synthesis with constrains such as null constrains, first-order and second-order derivative null constraints.