Papers by Keyword: Particle System

Abstract: To simulate snow falling scene dynamically, a method based on particle system is presented to simulate snow falling effects, it use calculated model to simulate the real effects of snow falling in the basis of snow natural characteristics. The simulation results have proven that the proposed method is more effective for simulating snow falling with realistic effects.

Abstract: Modern construction industry is in need of new building materials with improved operational properties. One of such materials is the sulfur-bituminous concrete – composite with matrix formed from sulfur and bitumen mix. Despite the high values of operational properties and economic efficiency of such concrete, there is the lack of necessary knowledge about technological properties of sulfur-bituminous concrete mix. The results of numerical modeling can be used to make initial decisions concerning values of control variables (relevant to mixture and technology). In the given work we present short review of the model and simulation algorithm involving particle systems as a material’s model and discuss the modeling results obtained during numerical studies of compaction process of sulfur-bitumen concrete. It is shown that for aggregates with size of one centimeter the optimal value of average thickness of the sulfur-bitumen layer is near to the one millimeter. Concrete mixes for which this condition is met can be characterized by dense structure similar to face-centered cubic.

Abstract: In material science the simultaneous application of theoretical examination, experimental and numerical studies are often required. This is especially true for modern composite materials with extra inter-boundary nanoscale layers. Thickness of layers is usually about tens of nanometers, while diameters of particles of filler are about several hundreds of nanometers. Thus, during the theoretical study and numerical experiments the size and properties of inter-boundary layer must be taken into account. The proper choice of the model is the key factor for the adequate results of simulation. In the present work we have derived such a model. The system under investigation – disperse-filled composite material with inter-boundary layers of different properties – is represented by particle system; these classes of models can be characterized by high generality. Initial equation for the law of motion is sequentially extended with terms which account for different phenomena – conservative binary interaction, non-conservative interaction with environment, interaction with planar boundaries and non-conservative particle-particle interaction via inter-boundary layer. The reduction of the law of motion to the system of ordinary differential equations had opened the possibility for utilization of the vast majority of numerical algorithms for the prediction of the structural properties of nanomodified sulfur-based composite.

Abstract: One problem in NEAT is too difficult to get the adaptive function value , Basing on some hypothesizes, we only need to widen the distance of features of speciation in the population the more the better. So the fitness function is to find the average characteristic distance of every speciation in current population, choose first n biggest speciation to leave, and remove others.

Abstract: In order to solve the problem that the speed of augmenting in NEAT algorithm is obviously not fast enough. We bring in the hybridization scheme. The scheme mainly gets new progeny chromosomes by combining parents ones. But it will probably bring in abnormal genes. As we record the time stamp for every gene, we can easily ensure that those genes are the same, so that we can simply get those completely reasonable hybrid chromosomes. We mainly use the time stamp of every gene to record information and make progeny chromosomes.

Abstract: The simulation technology of 3D cloud can be the ideal method to meet both making human visual scenes realistic and generating weather radar images in flight simulations. This paper describes a 3D cloud simulation method and technology that focuses in three aspects of cloud modeling, lighting and rendering. Firstly, the 3D cloud was modeled in a particle system to specify the atmosphere characteristics of cloud in natural world, then the textures were mapped to the particles to improve the cloud authentic and the lighting model was established to make the cloud environments realistic. Finally, the impostor technology was used to accelerate the rendering speed. The implementation on PC platform shows that the method and technology can generate realistic 3D cloud and the real time ability is satisfied.

Abstract: In order to simulate dynamic and randomness of irregular objects, like rain, snow, cloud, rut in the vehicle driving simulation system, here uses a method of hierarchical structured particle system dynamic modeling. First of all, the particles are divided into several units according to their similarity relation, then using the hierarchical tree structure to describe details. Through practice, this method can guarantee simulation precision and improve the real-time performance.

Abstract: The mathematical model of smoke diffusion and dissipation when shells exploding is studied, and the dynamic model based on particle system controlled by the mathematical model and texture mapping techniques is established. The visual simulation of the method is efficient and real-time.

Abstract: In 3D animation, there are several key technologies used to make the 3D characters, scene, and environments look much real and alive. The key technologies include motion capture, 3D fur and hair design, particle system, clothes design, and Billboard etc. These technologies are related with the efficiency of 3D animation. This thesis discusses these technologies separately and suggests methods to enhance the efficiency of 3D animation.

Abstract: In the light of the hovercraft simulation system of complex scene real-time rendering simulation requirements and driving control practical training, the principle of particle system has been introduced, and the hovercraft navigation gas-liquid medium effects simulation framework and a simulation approach based on the fluid particle hovercraft using motion equations and stochastic equation technology system have been put forward. The simulation results are consistent with the fluid shape characteristics, the scope and aerosol spray random motion characteristics, when the air-cushion vehicle is sailing, and can realize the visual effect of aerosol and water spray the hovercraft generated when navigating fast and realistically.