During shield tunneling,ground deformation poses significant safety risks.The full optimization strategy ignores interactions between parameters,resulting in suboptimal performance in the pre-control of settlement in ...During shield tunneling,ground deformation poses significant safety risks.The full optimization strategy ignores interactions between parameters,resulting in suboptimal performance in the pre-control of settlement in earth pressure balance shields.To address this problem,this paper proposes an integrated strategy that combines optimization and inversion,minimizing parameter interaction interference through adaptive adjustment of shield operation parameters.This mechanism performs an optimization search on the key operation parameters for settlement control,while the remaining operation parameters are predicted through inversion.Taking the Changchun Metro Line 6 project as an example,a bidirectional long short-term memory(Bi-LSTM)model enhanced by a multi-head self-attention(MHSA)mechanism is used to predict shield tunneling-induced settlement with spatiotemporal sequence dependency relationships.Particle swarm optimization and a random forest algorithm are used for optimization and inversion operations in the integrated mechanism,respectively.Subsequent ring position tests showed that the integrated mechanism-based adaptive adjustment strategy limited the average fluctuation of uncontrollable parameters to±13.95%compared to±34.27%for the full optimization strategy.The actual average settlement was only 3.81 mm compared to 4.72 mm for the full optimization strategy through collaborative parameter adjustment.The application validated the feasibility and applicability of the integrated mechanism,providing important references for the adaptive adjustment of shield parameters and tunnel construction automation.展开更多
针对航空电缆电弧故障因特征隐蔽性和危害性强引发的飞行安全隐患等问题提出一种新型检测方法。首先参考行业标准模拟飞行环境搭建试验平台完成数据采集。再采用北方苍鹰算法优化自适应噪声完备集合经验模态分解方法(Complete Ensemble ...针对航空电缆电弧故障因特征隐蔽性和危害性强引发的飞行安全隐患等问题提出一种新型检测方法。首先参考行业标准模拟飞行环境搭建试验平台完成数据采集。再采用北方苍鹰算法优化自适应噪声完备集合经验模态分解方法(Complete Ensemble Empirical Mode Decomposition with Adaptive Noise,CEEMDAN)将故障电弧电流分解为不同本征模态函数分量并对其提取多尺度模糊熵、时域、频域组合特征。最后设计秃鹰搜索-随机森林算法(Bald Eagle Search and Random Forest,BES-RF)进行电弧故障检测,结果表明:检测准确率达98.05%,相比传统分解方法与检测算法准确率提高3.5%、4.7%,验证该方法的有效性。展开更多
基金supported by the National Natural Science Foundation of China(No.51578263)the Jilin Provincial Department of Transport Project,China.
摘要During shield tunneling,ground deformation poses significant safety risks.The full optimization strategy ignores interactions between parameters,resulting in suboptimal performance in the pre-control of settlement in earth pressure balance shields.To address this problem,this paper proposes an integrated strategy that combines optimization and inversion,minimizing parameter interaction interference through adaptive adjustment of shield operation parameters.This mechanism performs an optimization search on the key operation parameters for settlement control,while the remaining operation parameters are predicted through inversion.Taking the Changchun Metro Line 6 project as an example,a bidirectional long short-term memory(Bi-LSTM)model enhanced by a multi-head self-attention(MHSA)mechanism is used to predict shield tunneling-induced settlement with spatiotemporal sequence dependency relationships.Particle swarm optimization and a random forest algorithm are used for optimization and inversion operations in the integrated mechanism,respectively.Subsequent ring position tests showed that the integrated mechanism-based adaptive adjustment strategy limited the average fluctuation of uncontrollable parameters to±13.95%compared to±34.27%for the full optimization strategy.The actual average settlement was only 3.81 mm compared to 4.72 mm for the full optimization strategy through collaborative parameter adjustment.The application validated the feasibility and applicability of the integrated mechanism,providing important references for the adaptive adjustment of shield parameters and tunnel construction automation.
摘要针对航空电缆电弧故障因特征隐蔽性和危害性强引发的飞行安全隐患等问题提出一种新型检测方法。首先参考行业标准模拟飞行环境搭建试验平台完成数据采集。再采用北方苍鹰算法优化自适应噪声完备集合经验模态分解方法(Complete Ensemble Empirical Mode Decomposition with Adaptive Noise,CEEMDAN)将故障电弧电流分解为不同本征模态函数分量并对其提取多尺度模糊熵、时域、频域组合特征。最后设计秃鹰搜索-随机森林算法(Bald Eagle Search and Random Forest,BES-RF)进行电弧故障检测,结果表明:检测准确率达98.05%,相比传统分解方法与检测算法准确率提高3.5%、4.7%,验证该方法的有效性。