With advantages of strong drive capability,nested-loop secondary linear machine(NLS-LM)has great potentiality in linear metro.For its secondary structure with multiple loops,it is difficult to calculate the electromag...With advantages of strong drive capability,nested-loop secondary linear machine(NLS-LM)has great potentiality in linear metro.For its secondary structure with multiple loops,it is difficult to calculate the electromagnetic thrust of NLS-LM reasonably.Hence,in this paper,one thrust calculation method is proposed considering variable loop inductance and transient loop current.Firstly,to establish the secondary winding function,the modeling domain is confined to a limited range,and the equivalent loop span is employed by analyzing the coupling relationship between primary and secondary.Then,in order to obtain the secondary flux density,the transient secondary current is solved based on the loop impedance and induced voltage.Finally,the electromagnetic thrust can be calculated reasonably by the given primary current sheet and the calculated secondary flux density.Comprehensive simulations and experiments have demonstrated the effectiveness of the proposed method.展开更多
以地铁隧道和旁侧开挖基坑的现场变形实测数据为基础,提出了基于贝叶斯动态线性模型(Bayesian Dynamic Linear Model,BDLM)的地铁保护区隧道变形预测方法。首先对隧道旁侧开挖基坑的水平变形建立BDLM预测模型,然后将基坑变形预测结果作...以地铁隧道和旁侧开挖基坑的现场变形实测数据为基础,提出了基于贝叶斯动态线性模型(Bayesian Dynamic Linear Model,BDLM)的地铁保护区隧道变形预测方法。首先对隧道旁侧开挖基坑的水平变形建立BDLM预测模型,然后将基坑变形预测结果作为回归变量,建立隧道变形的预测结果,最终实现了地铁隧道保护区变形的实时准确预测。采取了杭州地铁1号线某段有地铁开挖时的实测数据作为算例,验证了该方法的有效性。结果表明:所提出的BDLM预测方法能够准确预测短期内的基坑水平变形和地铁保护区隧道变形,同时有效的度量了模型中的不确定性,给出了预测结果的置信区间。展开更多
基金supported in part by the National Natural Science Foundation of China under Grants 52277050the Shenzhen International Collaboration under Grant GJHZ20210705142539007。
文摘With advantages of strong drive capability,nested-loop secondary linear machine(NLS-LM)has great potentiality in linear metro.For its secondary structure with multiple loops,it is difficult to calculate the electromagnetic thrust of NLS-LM reasonably.Hence,in this paper,one thrust calculation method is proposed considering variable loop inductance and transient loop current.Firstly,to establish the secondary winding function,the modeling domain is confined to a limited range,and the equivalent loop span is employed by analyzing the coupling relationship between primary and secondary.Then,in order to obtain the secondary flux density,the transient secondary current is solved based on the loop impedance and induced voltage.Finally,the electromagnetic thrust can be calculated reasonably by the given primary current sheet and the calculated secondary flux density.Comprehensive simulations and experiments have demonstrated the effectiveness of the proposed method.
文摘以地铁隧道和旁侧开挖基坑的现场变形实测数据为基础,提出了基于贝叶斯动态线性模型(Bayesian Dynamic Linear Model,BDLM)的地铁保护区隧道变形预测方法。首先对隧道旁侧开挖基坑的水平变形建立BDLM预测模型,然后将基坑变形预测结果作为回归变量,建立隧道变形的预测结果,最终实现了地铁隧道保护区变形的实时准确预测。采取了杭州地铁1号线某段有地铁开挖时的实测数据作为算例,验证了该方法的有效性。结果表明:所提出的BDLM预测方法能够准确预测短期内的基坑水平变形和地铁保护区隧道变形,同时有效的度量了模型中的不确定性,给出了预测结果的置信区间。
