The bucket wheel reclaimer(BWR) is a key piece of equipment which has been widely used for stacking and reclaiming bulk materials(i.e.iron ore and coal) in places such as ports,iron-steel plants,coal storage areas,and...The bucket wheel reclaimer(BWR) is a key piece of equipment which has been widely used for stacking and reclaiming bulk materials(i.e.iron ore and coal) in places such as ports,iron-steel plants,coal storage areas,and power stations from stockpiles.BWRs are very large in size,heavy in weight,expensive in price,and slow in motion.There are many challenges in attempting to automatically control their motion to accurately follow the required trajectories involving uncertain parameters from factors such as friction,turbulent wind,its own dynamics,and encoder limitations.As BWRs are always heavily engaged in production and cannot be spared very long for motion control studies and associated developments,a BWR model and simulation environment closely resembling real life conditions would be beneficial.The following research focused mainly on the implementation of fuzzy logic to a BWR motion control from an engineer's perspective.First,the modeling of a BWR including partially known parameters such as friction force and turbulence to the system was presented.This was then followed by the design of a fuzzy logic-based control built on a model-based control loop.The investigation provides engineers with an example of applying fuzzy logic in a model based approach to properly control the motion of a large BWR following defined trajectories,as well as to show possible ways of further improving the controller performance.The result indicates that fuzzy logic can be applied easily by engineers to overcome most motion control issues involving a large BWR.展开更多
为探究不同绿地调控方式对降雨径流的削减作用,以武汉市南湖汇水分区为研究对象,基于暴雨洪水管理模型(storm water management model,SWMM)模拟分析海绵绿地改造措施下的年径流总量控制率、峰值流量及峰现时间的变化规律,揭示蓝绿协同...为探究不同绿地调控方式对降雨径流的削减作用,以武汉市南湖汇水分区为研究对象,基于暴雨洪水管理模型(storm water management model,SWMM)模拟分析海绵绿地改造措施下的年径流总量控制率、峰值流量及峰现时间的变化规律,揭示蓝绿协同视角下城市汇水分区绿地削减雨水径流效应特征。结果显示:城市汇水分区尺度20%~30%的下凹式绿地改造,可实现年径流控制率65%的海绵城市建设目标;不同的海绵绿地改造措施中,复杂下凹绿地(具备蓄水层和下排管)和简单下凹绿地(无蓄水层和下排管)对于单场降雨事件的作用差异不明显,但长历时多场次降雨情况复杂下凹绿地的效果会更加显著。展开更多
基金support through the ARC Linkage LP0989780 grant titled "The study anddevelopment of a 3-D real-time stockpile management system"the support in part from Institute for Mineral and Energy Resources,University of Adelaide 2009-2010,as well as Faculty of Engineering,Computer and Mathematical Sciences strategic research funding,2010
文摘The bucket wheel reclaimer(BWR) is a key piece of equipment which has been widely used for stacking and reclaiming bulk materials(i.e.iron ore and coal) in places such as ports,iron-steel plants,coal storage areas,and power stations from stockpiles.BWRs are very large in size,heavy in weight,expensive in price,and slow in motion.There are many challenges in attempting to automatically control their motion to accurately follow the required trajectories involving uncertain parameters from factors such as friction,turbulent wind,its own dynamics,and encoder limitations.As BWRs are always heavily engaged in production and cannot be spared very long for motion control studies and associated developments,a BWR model and simulation environment closely resembling real life conditions would be beneficial.The following research focused mainly on the implementation of fuzzy logic to a BWR motion control from an engineer's perspective.First,the modeling of a BWR including partially known parameters such as friction force and turbulence to the system was presented.This was then followed by the design of a fuzzy logic-based control built on a model-based control loop.The investigation provides engineers with an example of applying fuzzy logic in a model based approach to properly control the motion of a large BWR following defined trajectories,as well as to show possible ways of further improving the controller performance.The result indicates that fuzzy logic can be applied easily by engineers to overcome most motion control issues involving a large BWR.
文摘为探究不同绿地调控方式对降雨径流的削减作用,以武汉市南湖汇水分区为研究对象,基于暴雨洪水管理模型(storm water management model,SWMM)模拟分析海绵绿地改造措施下的年径流总量控制率、峰值流量及峰现时间的变化规律,揭示蓝绿协同视角下城市汇水分区绿地削减雨水径流效应特征。结果显示:城市汇水分区尺度20%~30%的下凹式绿地改造,可实现年径流控制率65%的海绵城市建设目标;不同的海绵绿地改造措施中,复杂下凹绿地(具备蓄水层和下排管)和简单下凹绿地(无蓄水层和下排管)对于单场降雨事件的作用差异不明显,但长历时多场次降雨情况复杂下凹绿地的效果会更加显著。
