Rockfalls are one of the hazards that may be associated with open pit mining. The majority of rockfalls occur due to the existing conditions of slopes, such as back break, fractures and joints. Constructing a berm on ...Rockfalls are one of the hazards that may be associated with open pit mining. The majority of rockfalls occur due to the existing conditions of slopes, such as back break, fractures and joints. Constructing a berm on the catch bench is a popular method for the mitigation of rockfall hazards in open pit mining.The width of the catch bench and the height of the berm play a major role in the open pit bench design.However, there is no systematic method currently available to optimize the size of these parameters. This study proposes a novel methodology which calculates the optimum catch bench width by integrating the rockfall simulation model and genetic algorithm into a Simulation-Optimization Model. The proposed methodology is useful when used to determine the minimum catch bench width, or the maximum overall slope angle, insuring that a sufficient factor of safety of the slope is included while maximizing the overall profitability of the open pit mine.展开更多
以柴油机推进的内河巡逻船为研究对象,将其改造为甲醇-电动机混合动力推进系统(醇电混合动力推进系统)。基于CHG234V8MPI甲醇机的台架试验数据,在Simulink中搭建混合动力推进系统模型,并设计基于确定规则的能量管理控制策略。闭环仿真...以柴油机推进的内河巡逻船为研究对象,将其改造为甲醇-电动机混合动力推进系统(醇电混合动力推进系统)。基于CHG234V8MPI甲醇机的台架试验数据,在Simulink中搭建混合动力推进系统模型,并设计基于确定规则的能量管理控制策略。闭环仿真试验结果表明:在典型航行工况下,与传统柴油机推进系统相比,甲醇机推进系统具有一定的节能效果和明显的减排优势,而结合了电动机的醇电混合动力推进系统则可以显著降低燃料消耗和污染物的排放;船舶能耗降低74.07%,比油耗(brake specific fuel consumption,BSFC)降低84.73%,HC降低91.13%,CO降低91.37%,NOx降低93.79%。该研究为基于低碳燃料发动机的混合动力系统在内河船舶的绿色化改造方面提供了可行的技术方案。展开更多
动力电池包安装在电动汽车的底部,离地间隙通常只有十几厘米,底部容易磕碰导致电池包起火。为兼顾轻量化与防护性能要求,本文选用聚丙烯加玻纤(PPA)、芳纶、泡沫铝板等几种可以作为电池包底板的新型材料进行研究。对材料进行板材级挤压...动力电池包安装在电动汽车的底部,离地间隙通常只有十几厘米,底部容易磕碰导致电池包起火。为兼顾轻量化与防护性能要求,本文选用聚丙烯加玻纤(PPA)、芳纶、泡沫铝板等几种可以作为电池包底板的新型材料进行研究。对材料进行板材级挤压测试,根据试验结果对仿真模型进行修正,得到力学参数。进行整包的底部球击测试,得到不同材料的电芯侵入量和变形模式。仿真和测试结果表明,8 mm PPA复合材料(8 mm为厚度)的电芯侵入量最小,且质量相对较轻,满足性能要求。此研究对电池包的底部防护设计提供了参考,具有工程借鉴意义。展开更多
文摘Rockfalls are one of the hazards that may be associated with open pit mining. The majority of rockfalls occur due to the existing conditions of slopes, such as back break, fractures and joints. Constructing a berm on the catch bench is a popular method for the mitigation of rockfall hazards in open pit mining.The width of the catch bench and the height of the berm play a major role in the open pit bench design.However, there is no systematic method currently available to optimize the size of these parameters. This study proposes a novel methodology which calculates the optimum catch bench width by integrating the rockfall simulation model and genetic algorithm into a Simulation-Optimization Model. The proposed methodology is useful when used to determine the minimum catch bench width, or the maximum overall slope angle, insuring that a sufficient factor of safety of the slope is included while maximizing the overall profitability of the open pit mine.
文摘以柴油机推进的内河巡逻船为研究对象,将其改造为甲醇-电动机混合动力推进系统(醇电混合动力推进系统)。基于CHG234V8MPI甲醇机的台架试验数据,在Simulink中搭建混合动力推进系统模型,并设计基于确定规则的能量管理控制策略。闭环仿真试验结果表明:在典型航行工况下,与传统柴油机推进系统相比,甲醇机推进系统具有一定的节能效果和明显的减排优势,而结合了电动机的醇电混合动力推进系统则可以显著降低燃料消耗和污染物的排放;船舶能耗降低74.07%,比油耗(brake specific fuel consumption,BSFC)降低84.73%,HC降低91.13%,CO降低91.37%,NOx降低93.79%。该研究为基于低碳燃料发动机的混合动力系统在内河船舶的绿色化改造方面提供了可行的技术方案。
文摘动力电池包安装在电动汽车的底部,离地间隙通常只有十几厘米,底部容易磕碰导致电池包起火。为兼顾轻量化与防护性能要求,本文选用聚丙烯加玻纤(PPA)、芳纶、泡沫铝板等几种可以作为电池包底板的新型材料进行研究。对材料进行板材级挤压测试,根据试验结果对仿真模型进行修正,得到力学参数。进行整包的底部球击测试,得到不同材料的电芯侵入量和变形模式。仿真和测试结果表明,8 mm PPA复合材料(8 mm为厚度)的电芯侵入量最小,且质量相对较轻,满足性能要求。此研究对电池包的底部防护设计提供了参考,具有工程借鉴意义。
