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基于IA-BP智能算法的初始地应力场反演研究 被引量:2
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作者 孙港 王军祥 +2 位作者 郭连军 寇海军 徐景龙 《土木与环境工程学报(中英文)》 CSCD 北大核心 2023年第2期89-99,共11页
初始地应力场是地下工程设计与施工的重要依据,在实际工程中难以精准测得,为了能较准确地获得初始地应力场的分布规律,提出将免疫算法与BP神经网络相结合(IA-BP)的算法对初始地应力场进行反演研究。免疫算法优化BP神经网络就是将BP神经... 初始地应力场是地下工程设计与施工的重要依据,在实际工程中难以精准测得,为了能较准确地获得初始地应力场的分布规律,提出将免疫算法与BP神经网络相结合(IA-BP)的算法对初始地应力场进行反演研究。免疫算法优化BP神经网络就是将BP神经网络的连接权值和阈值作为免疫算法中的抗体进行编码。该混合算法既可以利用免疫算法全局寻优的特点快速搜索到全局最优解或次优解附近,又可以采用BP算法避免在最优解和次优解附近发生震荡,对其进行局部优化,从而达到快速收敛全局最优解的目的。通过COMSOL分别构建平面边坡模型及三维立体模型,对其进行正分析计算,将计算的结果作为“实测值”,对地应力进行反演分析,并将IA-BP算法反演的结果与PSO-BP算法及多元线性回归算法的反演结果进行对比。结果表明:二维边坡模型下,IA-BP算法反演结果误差更小。三维模型下,IA-BP算法所得实测值与反演值之间的相对误差的绝对值为0%~10.64%(平均为3.39%),PSO-BP算法所得实测值与反演值之间相对误差的绝对值为0%~48.39%(平均为6.93%),多元线性回归算法所得实测值与反演值之间相对误差的绝对值为0.55%~121.95%(平均为21.87%),通过对比可知,IA-BP算法整体反演结果精度最高。无论是平面模型还是三维模型,利用IA-BP算法反演出的结果与其他两种算法反演的结果相比,误差更小。将IA-BP智能算法运用到地应力场的反演研究中,可以为地下工程的建设提供依据。 展开更多
关键词 地应力场 免疫智能算法 粒子群智能算法 多元线性回归
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Immune evolutionary algorithms with domain knowledge for simultaneous localization and mapping 被引量:4
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作者 李枚毅 蔡自兴 《Journal of Central South University of Technology》 EI 2006年第5期529-535,共7页
Immune evolutionary algorithms with domain knowledge were presented to solve the problem of simultaneous localization and mapping for a mobile robot in unknown environments. Two operators with domain knowledge were de... Immune evolutionary algorithms with domain knowledge were presented to solve the problem of simultaneous localization and mapping for a mobile robot in unknown environments. Two operators with domain knowledge were designed in algorithms, where the feature of parallel line segments without the problem of data association was used to construct a vaccination operator, and the characters of convex vertices in polygonal obstacle were extended to develop a pulling operator of key point grid. The experimental results of a real mobile robot show that the computational expensiveness of algorithms designed is less than other evolutionary algorithms for simultaneous localization and mapping and the maps obtained are very accurate. Because immune evolutionary algorithms with domain knowledge have some advantages, the convergence rate of designed algorithms is about 44% higher than those of other algorithms. 展开更多
关键词 immune evolutionary algorithms simultaneous localization and mapping domain knowledge
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A Novel Evolutionary Feedforward Neural Network with Artificial Immunology
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作者 宫新保 臧小刚 周希朗 《Journal of Shanghai Jiaotong university(Science)》 EI 2003年第1期40-42,共3页
A hybrid algorithm to design the multi layer feedforward neural network was proposed. Evolutionary programming is used to design the network that makes the training process tending to global optima. Artificial immunol... A hybrid algorithm to design the multi layer feedforward neural network was proposed. Evolutionary programming is used to design the network that makes the training process tending to global optima. Artificial immunology combined with simulated annealing algorithm is used to specify the initial weight vectors, therefore improves the probabiligy of training algorithm to converge to global optima. The applications of the neural network in the modulation style recognition of analog modulated rader signals demonstrate the good performance of the network. 展开更多
关键词 feedforward neural networks evolutionary programming artificial immunology
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