Applied Mechanics and Materials Vols. 170-173

Abstract: In this study, the Lagrangian method is used simulate a process of particles resuspending from occupant walking and being carried away by exhaust in a under-floor air distribution (UFAD) room. Experiments are performed in the prototype of the model room, the results confirmed the particles concentration decay tendency. On the other hand, the numerical simulation results for time of decontaminate the particulates in indoor is agreement with the experimental results. It indicates that the Lagrangian method is suitable for calculate such a process. Based on these studies, the following conclusions can be obtained: (1) human walking cause the particles above 5μm increased rapidly by which resuspended into indoor air; (2) the particles can removaled by exhaust quickly, and it will not cause a long term effect.

Abstract: Modern fault diagnosis system always is a dynamic, flexible and uncertain complicated system, so many fault diagnosis methods are not effective to determine fault causes. Considering that abundant of fault diagnosis cases have been accumulated in daily maintenance work, a fault diagnosis method based on case-based reasoning (CBR) and rough set theory is proposed. Rough set theory is employed to process reduction on attributes and the weighting coefficient of case description attributes. This method makes full use of the advantage of" let the data speak". At last the method is testified by an example, and the result shows it is feasible and effective.

Abstract: To meet requirements of automated warehouse stacker PLC control system monitoring software, a method of serial communication between the Panasonic Electrical FP1 type PLC and computer has been developed. The communication protocol, PLC communications settings and function process design are presented.

Abstract: The concept of system design requires to conduct design integration while breaking specialty barriers. This leads to the broadening of design vision as well as the development of new design methods. Underground garages in urban residential districts fail to meet humanized demands because of the single design guideline of underground transportation buildings. Introducing the design concepts such as visual identity guidance, landscape design and space design, etc. and diversifying design methods, based on the idea of people-oriented, can enhance the quality of space environment, improve the dehumanized situation and obtain various benefits.

Abstract: In recent years, many data sets are accessed for the purposes of research, cooperation and e-business, and so on. Publishing data about individuals without revealing their private information has become an active issue, and k-Anonymous-based models are effective techniques that prevent linking attack. We analyzed the privacy leakage problem in data publishing environment. Then we concluded the privacy preserving technologies, and clarified the k-anonymity models. Finally we conclude the directions of this area.

Abstract: The wet flue gas desulfurization is the main technology used today in China. Aimed the sintering gas desulfurization tower, Fluent software is used here to simulate the flow in the tower with different gas entrance angle and velocity, and we have got the effect of sintering gas entrance angle and velocity on the flow in the tower. The result shows: an appropriate increase of the gas entrance velocity and a downward inclined angle will be helpful for extending the residence time in the tower of the sintering gas and it will also improve the flow in the tower. This research could provide reference for the design and application of new wet flue sintering gas desulfurization tower later.

Abstract: Numerical simulate analyze a super-long steel plant with ANSYS,calculate the structure in expansion joint,without expansion joint and without long circle bore structure of these three kind situations,analyze temperature stress and vertical displacement of the main component when the temperature changes.Setting expansion joint can control the temperature stress in a small range,which is a widely used method at present.However,not setting expansion joint and the use of long hole structure connection can control the size of the temperature stress and ensure the structure globality,it can provide design basis of this method in engineering applications.

Abstract: These precision instruments and equipments install inside the high-tech factory buildings have highly tendency of sensitiveness to ambient vibration; therefore, the criteria of ambient vibration have extremely strict requirements in relatively. For comply ambient vibration to have in accordance with the vibration standards, access the principle of increasing the product defect-free rate, the most common solution is applied by enhance the strength of its earth ground base. Nowadays the foundation base design of high-tech factory buildings is not like Seismic Design can be calculated by formulas and acquired the advance ambient vibration results from the software simulations; hence after the finalization of the factory building construction, it is necessary to have in-filed detection with inspection to makeup these improvements. As a matter of fact the weak signal can be hardly detected, so it reply on specific sensor to transform the signal into low current or low voltage then use an amplifier to magnify its amplitude; in the meanwhile, it not only enlarge the required signal but also the unnecessary noise in the whole process. This study apply Ensemble Empirical Mode Decomposition (EEMD) method to analyze the original signal, and the mean period of the Intrinsic Mode Function (IMF) derived partial components to proceed Fast Fourier Transform (FFT) transformation in order to get partial signal frequency; hereafter apply the white noise to substitute the first signal then reorganized it as the source of ambient vibration signal, a comparison is being made between the background vibration value of its actual measurement and the earth ground base response of its real measurement value. It anticipates having control the influential value of ambient vibration of the construction under the phase when design the factory building in order to elevate the reliable degree of foundation construction design in the future.

Abstract: We analyzed the characteristics of highway simulation system; established framework for a Multi-Agent based simulation system, and identified the construction framework for the highway safety simulation model. Through constructing computer simulation models – vehicle model, driver model, road model and barrier crash simulation model – to simulate vehicle operation on highway, we obtained quantitative indices such as operating speed, acceleration, and brake requirement, and evaluated highway design specifications. In consideration of specific highway project, we analyzed and evaluated the application effect of the simulation model in alignment safety evaluation and barrier setting safety evaluation, confirmed that the practicality of the simulation model. The result showed that computer simulation can help designers find design problems during the design period, make timely correction, and improve the scientificity and appropriateness.

Abstract: Implicit method is one of the most important ways of Finite element method. In this paper, finite element software are used for the CTOD test specimens to simulate the characteristic values, then compared with the experimental data to draw the appropriate conclusions.