Intermediate charging and sudden failure of automatic guided vehicles(AGVs)interrupt and severely affect the stability and efficiency of scheduling.Therefore,an AGV scheduling approach considering equipment failure an...Intermediate charging and sudden failure of automatic guided vehicles(AGVs)interrupt and severely affect the stability and efficiency of scheduling.Therefore,an AGV scheduling approach considering equipment failure and power management is proposed for outfitting warehouses.First,a power consumption model is established for AGVs performing transportation tasks.The powers for departure and task consumption are used to calculate the AGV charging and return times.Second,an optimization model for AGV scheduling is established to minimize the total transportation time.Different conditions are defined for the overhaul and minor repair of AGVs,and a scheduling strategy for responding to sudden failure is proposed.Finally,an algorithm is developed to solve the optimization model for a case study.The method can be used to plan the charging time and perform rescheduling under sudden failure to improve the robustness and dynamic response capability of AGVs.展开更多
为深入探究港口物流与当地宏观经济的内在联系,采用混频数据抽样(mixed-frequency data sampling,MIDAS)模型分析国内5个省市港口的月度港口货物吞吐量增长率对其季度GDP增长率预测的有效性。研究结果表明:港口货物吞吐量表征的港口物...为深入探究港口物流与当地宏观经济的内在联系,采用混频数据抽样(mixed-frequency data sampling,MIDAS)模型分析国内5个省市港口的月度港口货物吞吐量增长率对其季度GDP增长率预测的有效性。研究结果表明:港口货物吞吐量表征的港口物流对当地GDP具有较好的预测效果;相较于传统的季节性自回归综合移动平均(autoregressive integrated moving average,ARIMA)模型,MIDAS模型能够捕捉高频解释变量的有用信息,提高预测精度。展开更多
基金Supported by the China High-Tech Ship Project of the Ministry of Industry and Information Technology under Grant No.[2019]360.
文摘Intermediate charging and sudden failure of automatic guided vehicles(AGVs)interrupt and severely affect the stability and efficiency of scheduling.Therefore,an AGV scheduling approach considering equipment failure and power management is proposed for outfitting warehouses.First,a power consumption model is established for AGVs performing transportation tasks.The powers for departure and task consumption are used to calculate the AGV charging and return times.Second,an optimization model for AGV scheduling is established to minimize the total transportation time.Different conditions are defined for the overhaul and minor repair of AGVs,and a scheduling strategy for responding to sudden failure is proposed.Finally,an algorithm is developed to solve the optimization model for a case study.The method can be used to plan the charging time and perform rescheduling under sudden failure to improve the robustness and dynamic response capability of AGVs.
