基于反向建模的細(xì)胞自動(dòng)機(jī)水泥水化仿真方法研究
[Abstract]:Cement is widely used in the field of industry and is the pillar of infrastructure construction in the world. The microstructure of cement directly affects its strength, so it is very important to study the evolution process of cement hydration to improve the performance of cement. Due to the extreme complexity of cement hydration, the process of cement hydration has not been fully understood. In the process of studying cement hydration, the traditional physical and chemical method is based on the sample index determined by experiment, and the artificial hydration rule is used to model the model. The method is complex and the accuracy of the model is low. With the development of computational materials, computer simulation of cement hydration process has become a hot spot in material science. In this paper, the cellular automata model of the 3D microstructure evolution of cement hydration is established by using the idea of reverse modeling. The hydration rules are extracted from the observed data in many ways, and the experimental results of different models are simulated and compared. In this paper, the evolution process of cement hydration microstructure is studied and analyzed from the following aspects: (1) feature extraction and data preprocessing method based on 渭 CT is proposed. Because the CT technique can not damage the sample itself in the process of scanning the sample, it can guarantee the authenticity of the sample data. At the same time, the gray value of 渭 CT pixel can represent the average linear attenuation coefficient of the region, which is related to the composition of the phase in the cement image. This can ensure that there is a good correlation between the gray value of the image pixels obtained by 渭 CT and the material composition represented by the corresponding position. The 2D cement image sequence was used to synthesize the 3D cement particles, and the surrounding 26 pixels were determined as neighborhood by the position of 3D space, and the feature data related to the neighborhood were extracted based on the neighborhood. After processing, the data can be used as the original input and output data of various models. (2) the multi-gene expression and particle swarm optimization algorithm are mixed to program to adapt to the characteristics of cement hydration data. In this paper, a hybrid MEP-PSO programming algorithm using multi-gene expression to optimize (MEP) function structure and particle swarm optimization algorithm (PSO) to optimize function coefficients is proposed. This algorithm is used to test the regression problem in UCI dataset, and compared with other common algorithms. The results show that the hybrid programming method has a good performance in solving the general function discovery problem. (3) the reverse modeling model of cement microstructure evolution process is analyzed in this paper. Finally, several reverse modeling methods are used to construct cement hydration microjunction. Cellular automata model, The principle structure and realization of the model are analyzed in detail, and the error of simulation results is explained. The experimental results show that the model established by using MEP-PSO hybrid programming method has good prediction results on all test data sets. At the same time, the model established by different cement samples has been tested on the other cement samples, which shows that the model established by this method has good generalization ability.
【學(xué)位授予單位】:濟(jì)南大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2015
【分類(lèi)號(hào)】:TQ172.1;TP18
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