Advanced Materials Research Vols. 282-283

Abstract: According ad grid computer by application, Grid computer security has be valued more and more. LDAP is a information catalogue, it defined customer and group just one, that can commonly shared it with machine and application program too many. This paper is defined group and user object to accomplish with the user code and legal power, thereby control that encryption and permission by C/S.

Abstract: As a new functional material, foam aluminum is characteristic of sound absorption and vibration attenuation. A multiple structure is put forward which composed of foam aluminum and base blankets. The sound insulation performance is investigated. The method of sound transmission loss for normal wave incidence is developed. The influences of different thick foam aluminum on the multiple structures are analyzed by numerical method, also verified by experiments. The results show that experimental results are in good agreement with the theoretical predictions and the thickness of foam aluminum has a great impact on the multiple structure’s sound transmission loss.

Abstract: In allusion to a truck transmission frame, using finite element method, its modal analysis and randomly vibration simulation analysis is conducted based on ANSYS software. According to the results of modal analysis, Power Spectral Density of random vibration was carried out. Related strength and deformation parameters of the truck frame were obtained through analysis. The calculation result has important reference meanings to the frame of the design modifications and finalizing the design and trying type. The calculation method used in the paper can also be used in calculation of other random vibration system.

Abstract: In allusion to a truck transmission gears, a nonlinear vibration model of transmission gears was constructed based on the theory of gear system dynamics and nonlinear dynamics. Basing on the computing platform Matlab and using the Runge-Kutta method to calculate the time history response of gear vibration when the gap exists, and the case of non-resonant and load gear backlash vibration frequency of gear changes were studied. The results of this paper have an important significance to improve the movement of transmission gears to pass accuracy, reduce noise, reduce failures and increase gear life.

Abstract: To assess the soil heavy metal pollution, there are so many methods, such as the mono pollution-factor, the comprehensive Nemerow pollution-factor and so on. Grey Relational Analysis (GRA) is one of the major contents of gray system theory. The method of GRA was used in the application of environmental impact assessment, such as water pollution research. In this paper, we designed the new practical method of the heavy metal pollution evaluation, which is focus on six soil heavy metals (Cd, Hg, Pb, Cr, Cu, Zn). According to the consenting range of environment level by the National Environmental Standard (GB15618-1995), we have done our researches.

Abstract: With the rapid development of spatial database technology, spatial databases have been widely used in many engineering fields and rapidly increase in data capacity. Thus, to mine useful information from large spatial databases turns into a difficult but important task. In this paper, we apply the traditional data mining into spatial database and give a mining model for spatial data based on Campus GIS. Moreover, based on campus GIS, we implement a spatial data mining prototype system that is able to discovery the useful spatial features and patterns in spatial databases. The application in the campus GIS of a university has shown the feasibility and validity of the system.

Abstract: In the domestic manufacturing enterprises, ERP application integration with other enterprise system has become a hot topic. In this paper we propose a new approach of visualization service integration based on ERP. Also, based on the actual needs of the system, a Visualization Interface is designed, in which programming is realized. This implement provides a reference for the similar visual integration.

Abstract: Based on the application of tandem weapon used to destroy concrete target this paper presents the results of simulation and experiment that investigate the penetration performance of shaped charge to runway. Jet formation and penetrating into multi-layer target was calculated by hydro code LS-DYNA3D. Jet tip velocity and jet length, also the penetration performance are studied. The damage performance of shaped charge is validated by experiment. The analysis demonstrates the shaped charge can create a big borehole for subsequent projectile to follow in.

Abstract: The automobile resistance reduction problem is the major topic in the automotive industry because of its link with economy and safe. Taking Computational Fluid Dynamics software as the platform, the automobile as the research object, the simulation models are established based on unsteady, viscous Reynolds averaged k-ε equations, by using dynamic grid and finite volume method. The aerodynamic characteristics of the automobile were studied with the different rear windscreen angles, such as 30°,35°,40°and 45°respectively. Analysis of trailing vortex automobiles for resistance. The results show that the different angle of the rear window, the flow separation and re-attachment points for the different, the resistance coefficient is also different. The conclusions of analysis provide the theoretical foundation for styling optimization of automobile，it is of certain guiding significance for practical application.

Abstract: Candy production processes involve many process variables. Operators often find it difficult to effectively monitor the process data, analyze current states, detect and diagnose process anomalies, and take appropriate actions to control the processes. The objective of this work is to develop an intelligent control system of candy production process to improve final candy quality and to increase production efficiency with good human-machine interfaces. The study is conducted by using virtual instrument, multi-sensor data fusion and fuzzy control technology to online detect and control typical parameters. Experiment results show that this system can reach requirements of processing accuracy and real-time property and is highly cost-efficient and practical.