Applied Mechanics and Materials Vols. 336-338

Abstract: GIS technology has been applied in city planning management and virtual city. It still hasnt got more substantive achievements on aided design of regulatory plan. The notion of Modeling-Incubator has been advanced and integrated with GIS, which is the key resolution and method to 3D simulation of regulatory plan indexes, such as building coverage, floor area ratio, building interval etc. This resolution will be applied in regulatory plan assessment.

Abstract: To achieve 3D grid models which have a non-uniform size and varying properties, we proposed the algorithm of grid subdivision and encryption by human-computer interaction. This algorithm was the technology based on 3D geological modeling, and achieving process has following three steps. Firstly, we converted many 2D cross sections to 3D space, and reconstructed 3D vector models using the algorithm of optimal path suture, and set the property of abnormal body and surrounding rock. Then, achieving 3D grids subdivided according to the relationship between the center of 3D grid and 3D vector models, the properties of 3D grids were determined. Finally, we encrypted grids in the survey area and expansion area, and modified the properties. The results show that the algorithm can realize the conversion from 3D vector models to 3D grid models, and this process is reliable and efficient.

Abstract: Designing an interactive virtual navigation system needs consideration of compositive features such as modelling, movement control and object selection. Those features are key to meet end user requirements. Current virtual navigation systems are not beneficial to popularize in the case of development environment, methods and technologies. That is because such systems have limited application area and costs. Proprietary development environment result in limited selection in system components while new development technologies are unlikely to be accepted as staggering capital costs. In this paper, we propose a feasible scheme and development environment to design an interactive virtual navigation system for creating and utilizing digital campus models. Furthermore, the scheme also captures user interactivities via mouse and keyboard for further controls and selections in virtual campus. By adequate consideration of user preferences and personalities, this system benefits in portability, flexibility; has a high degree of standardization and lower cost.

Abstract: Discussed the key effects and basic principles of data fusion of remote sensing for realizing plants virtual reality simulation. Focused on researching and presenting the general methods of data fusion of remote sensing, application interfaces, and 3D visual display of virtual plants. Through the research, the visual display of visual plants will be realized with full remote sensing interfaces of real-time transferring and intervening.

Abstract: It is possible to model and evaluate avatar-included virtual environment in the condition of advanced hardware and software technologies of digital 3D. In traditional design and evaluation, there is no interaction between digital virtual scene and avatars, and no dynamic modifying options for virtual scene. Interaction and dynamic design option are the most important functions for virtual reality simulation. The paper presented the modeling method of avatar-included virtual scene first, discussed the method of testing and evaluating for it secondly. The research can assist and support realization of avatar-included virtual scene real-time interaction, testing and evaluating for stability, security and humanoid.

Abstract: This paper researches on 3D visualization of underground antique tomb based on Augmented Reality .At first,this paper established 3D model of antique tomb with OpenGL in VC++6.0. In order to establish augmented reality 3D model of antique tomb, the OpenGL model of antique tomb was transferred into ARToolKit and realized 3D augmented reality visualization in ARToolKit. As ARToolKit uses computer vision techniques to calculate the real camera position and orientation relative to marked cards,so it is difficult to provide AR applications in outdoor environment. At last, this paper puts forth a new method to allow ARtoolkit to receive the data of GPS and 3D electronic compass, so it can make 3D registration with both computer vision and sensors.

Abstract: Based on the background of rotary platform of launching tower ,the continuum method based on rigidity equivalent principle and mass equivalent principle is used to transform the truss structure to an uniform solid cantilever beam rotating around its edge ,which makes the vibration equations establishment with methods of parameter supposition and numerical analysis possible . The agreement of the calculation results and the test results means method of this paper available in the vibration analysis of cantilever truss structure .

Abstract: Physical mechanism for switching state of SITHs was discussed, the two-dimensional turn-off model was proposed, expressions of t_on and t_off were mathematical derived. Measures to reduce the switching time of SITHs, such as reducing the gate width W_G and n^- region width W_n-, doping Boron atoms with higher density,etc.,were put forward and verified by experiments.

Abstract: The wide-area protection technology is considered to apply in construction of smart grid, which offers new challenge to verifying work for secondary system. This paper describes a new method for onsite commissioning of wide-area power grid. It can accomplish coordination tests for protection devices in different areas based on numerical simulation and wireless commutation technology. Because structure of power grid is too complex to calculate results of electromagnetic transient efficiently. A new approach of simulation is shown in the paper, which uses FDNE circuit to replace external system. And an example of test is offered. The simulation result indicates that electromagnetic transient computation with FDNE can be satisfied with debug work for occurrence chains in smart grid.

Abstract: The cycle performance and the capacity fading model of 18650 Li-ion batteries and the possibility of dual-battery switching technology applied in marine buoys were studied. The recycling capacity fading data of 18650 li-ion batteries were gained and the data were fit by Matlab cttool toolbox. A fitting curve more in line with the scatters was gained. The number of cycles was calculated when the battery capacity remaining 80%. Then the normal working time and the working time using battery switching theory of a buoy were calculated under that specific number of cycles. The results show that the 18650 li-ion battery capacity fading model adheres more to the power function model than linear function model. Its correlation coefficient reaches 0.9811 and it shows a high fitting degree. The longevity of the battery pack using battery switching technology is 28.79% longer than the traditional single battery pack.