[目的]解决海堤传统维修方式存在维修保障能力差、易造成重大损失的问题,建立科学的海堤健康管理系统。[方法]将先进的故障预测与健康管理(prognostic and health management,PHM)技术应用于海堤工程中,研究建立海堤PHM系统,并深入探讨...[目的]解决海堤传统维修方式存在维修保障能力差、易造成重大损失的问题,建立科学的海堤健康管理系统。[方法]将先进的故障预测与健康管理(prognostic and health management,PHM)技术应用于海堤工程中,研究建立海堤PHM系统,并深入探讨海堤PHM系统的预测和健康评估方法。结合海堤特点及海量、高频的实测信息,提出将具有强大寻优能力的水循环算法与神经网络相结合,形成海堤状态预测模型;并综合考量海堤健康影响因素,基于模糊数学建立系统健康评估模型。[结果]实例分析表明,所建立的海堤PHM系统预测模型和健康评估模型可有效预测海堤状态,并对海堤现阶段和未来一定时段的健康状况进行准确的实时评估和预评估。[结论]形成了适应海堤工程特点的海堤PHM系统框架,所建立的预测模型和健康评估模型科学有效。展开更多
This work considers those road networks in which there are multi-route choices for bifurcation-destination(or origin-destination) pairs, and designs a real-time variable message sign(VMS)-based routing control strateg...This work considers those road networks in which there are multi-route choices for bifurcation-destination(or origin-destination) pairs, and designs a real-time variable message sign(VMS)-based routing control strategy in the model predictive control(MPC) framework. The VMS route recommendation provided by the traffic management authority is directly considered as the control variable, and the routing control model is established, in which a multi-dimensional control vector is introduced to describe the influence of route recommendations on flow distribution. In the MPC framework, a system optimum routing strategy with the constraints regarding drivers' acceptability with recommended routes is designed, which can not only meet the traffic management authority's control requirement but also improve drivers' satisfaction with the route guidance system. The simulation carried out shows that the proposed routing control can effectively mitigate traffic congestion, reduces followers' time delay, and improves drivers' satisfaction with routing control in road networks.展开更多
文摘[目的]解决海堤传统维修方式存在维修保障能力差、易造成重大损失的问题,建立科学的海堤健康管理系统。[方法]将先进的故障预测与健康管理(prognostic and health management,PHM)技术应用于海堤工程中,研究建立海堤PHM系统,并深入探讨海堤PHM系统的预测和健康评估方法。结合海堤特点及海量、高频的实测信息,提出将具有强大寻优能力的水循环算法与神经网络相结合,形成海堤状态预测模型;并综合考量海堤健康影响因素,基于模糊数学建立系统健康评估模型。[结果]实例分析表明,所建立的海堤PHM系统预测模型和健康评估模型可有效预测海堤状态,并对海堤现阶段和未来一定时段的健康状况进行准确的实时评估和预评估。[结论]形成了适应海堤工程特点的海堤PHM系统框架,所建立的预测模型和健康评估模型科学有效。
基金Projects(61304203,51409157)supported by the National Natural Science Foundation of ChinaProject(12ZR1444800)supported by the Natural Science Foundation of Shanghai,China
文摘This work considers those road networks in which there are multi-route choices for bifurcation-destination(or origin-destination) pairs, and designs a real-time variable message sign(VMS)-based routing control strategy in the model predictive control(MPC) framework. The VMS route recommendation provided by the traffic management authority is directly considered as the control variable, and the routing control model is established, in which a multi-dimensional control vector is introduced to describe the influence of route recommendations on flow distribution. In the MPC framework, a system optimum routing strategy with the constraints regarding drivers' acceptability with recommended routes is designed, which can not only meet the traffic management authority's control requirement but also improve drivers' satisfaction with the route guidance system. The simulation carried out shows that the proposed routing control can effectively mitigate traffic congestion, reduces followers' time delay, and improves drivers' satisfaction with routing control in road networks.
