针对目前电力系统扰动数据分类特征提取困难和易受谐波干扰的问题,提出一种新的基于压缩感知的电力系统扰动数据采集与分类算法。首先通过压缩感知和K奇异值分解(K-SVD:K-Singular Value Decomposition)字典学习算法,设计一种原子自适...针对目前电力系统扰动数据分类特征提取困难和易受谐波干扰的问题,提出一种新的基于压缩感知的电力系统扰动数据采集与分类算法。首先通过压缩感知和K奇异值分解(K-SVD:K-Singular Value Decomposition)字典学习算法,设计一种原子自适应的正交匹配追踪算法(AtOMP:Atom adaptive Orthogonal Matching Pursuit),对多种扰动数据进行压缩采集,然后提取扰动数据的稀疏特征、自适应字典原子的标准差、峭度、裕度因子和主频率个数5个分类特征,利用BP(Back Propagation)神经网络实现样本学习与分类。实验结果表明,该算法可实现扰动数据的高度压缩采集,数据量小,具有分类识别度高,抗干扰性强等优点。展开更多
The equation used to model the unidirectional flow of methane gas in coal seams is usually formulated as a nonlinear partial differential equation, which needs to be solved numerically with a computer program.Neverthe...The equation used to model the unidirectional flow of methane gas in coal seams is usually formulated as a nonlinear partial differential equation, which needs to be solved numerically with a computer program.Nevertheless, for people without access to the computer program, the conventional numerical method may be inconvenient. Thus, the objective here is to seek some method simpler than the conventional one for solving the flow problem. A commonly used model of the unidirectional methane gas flow is considered, where the methane adsorption is described by the Langmuir isotherm and the free gas is treated as real gas. By introducing the similarity solution, a simple method for solving the flow model is proposed, which can be done on a hand calculator. It is shown by two examples that the gas pressure profile obtained by the proposed method agrees well with the direct numerical solution of the flow model.展开更多
基金provided by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
文摘The equation used to model the unidirectional flow of methane gas in coal seams is usually formulated as a nonlinear partial differential equation, which needs to be solved numerically with a computer program.Nevertheless, for people without access to the computer program, the conventional numerical method may be inconvenient. Thus, the objective here is to seek some method simpler than the conventional one for solving the flow problem. A commonly used model of the unidirectional methane gas flow is considered, where the methane adsorption is described by the Langmuir isotherm and the free gas is treated as real gas. By introducing the similarity solution, a simple method for solving the flow model is proposed, which can be done on a hand calculator. It is shown by two examples that the gas pressure profile obtained by the proposed method agrees well with the direct numerical solution of the flow model.
