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Radioactive Nuclides Diffusion Description Based on 3D Digital Battlefield

Author: BianYanShan
Tutor: WeiYingMei；JiangJie
School: National University of Defense Science and Technology
Course: Control Science and Engineering
Keywords: radioactive nuclides diffusion quadtree ray-casting hierarchical bounding box GPU
CLC: TP391.41
Type: Master's thesis
Year: 2010
Downloads: 28
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Abstract


The future war, which is based on information technology, can happen under the nuclear threat. The simulation and representation of the potential nuclear strike and its influence scope is an important part in the digital battlefield environment.However, a perfective radioactive nuclides diffusion model isn’t achievable because of the deficient experimentative data and condition. And people usually do researches on the basis of the atomospheric dispersion models. Based on the representation of nuclear dispersion range in a 3D battlefield environment, a lot of studies for simulating the performance have been done. This thesis provides a fast and intuitive support of auxiliary information for the contingency plans established by the operational commanders.The main work and contributions are described as follows:Having done a lot of analysisses and comparisions on the existing atmospheric diffusion models, combining with the features of the spread of radionuclides,on the basis of RIMPUFF model integrated in RODOS,this thesis simplifies the wind field,dry deposition and the decay of the radioactive nuclides. With a view to the complex terrains, especially these high mountations, the atomospheric dispersion AERMOD model is introduced into the dispersion model for treating with complex terrains to ameliorate the RIMPUFF model, and the new model is achieved which can be used for the radioactive nuclides diffusion the the 3D battlefield environment.In order to overcome the influence on the rendering efficiency caused by the vast calculation of the dispersion model, this thesis proposes the edge quadtree subdivision algorithm according to the characteristics of the radionuclide diffusion. This algorithm can minimize the 2D geometrical complexity of the diffusion model on the premise of ensuring the smooth and continuous range edge. At the same time, the gradual approaching method from the outside of the diffusion range is proposed in order to avoid the rendering blank areas caused by the emergence of some error points.In order to depict the influence on the radioactive nuclides diffusion of the rerrains, the performance of the three-dimensional model is designed and implemented and the GPU is utlized to accelerate the calculation and achieve the quick volume rendering. At first, making use of the powerful computing ability of GPU’s floating point values, this thesis designs the reasonable GPU’s pixel shader for parallel computing which accelerates the generation of volume data. Then, based on the ray-casting, the hierarchical bounding box is designed to modify the starting and the ending points of the casting rays for resampling. The ray advanced ending method is also applied to reduce the number of resampling points. And then, GPU is made use to speed up the three-dimensional rendering in the dispersion range.Integrating with those foregoing work, a prototype system named ENDSys is designed, and this system can depict the dynamic progress of 2D and 3D radioactive nuclides diffusion. The researchs and jobs that have been done are applied and validated in this system. Some parts of this system have been applied to correlative projects.

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