随着经济的发展,在各行各业中分布式生产变得越来越普及,故将更多的注意力放在分布式生产模型之上。为求解带有序相关设置时间和到达时间的零等待分布式流水线调度问题(No-wait Distributed Flow Shop with Sequence Dependent Setup Ti...随着经济的发展,在各行各业中分布式生产变得越来越普及,故将更多的注意力放在分布式生产模型之上。为求解带有序相关设置时间和到达时间的零等待分布式流水线调度问题(No-wait Distributed Flow Shop with Sequence Dependent Setup Times and Arrival Times,NDPFSP with SDSTs and RDs),提出了一种自适应的分布估计算法(Adaptive Estimation of Distribution Algorithm, AEDA),用于最小化最大完成时间。首先,提出了更加适合于带到达时间问题的最早完成工厂问题的带有到达时间的最早完成工厂(the Earliest Completion Factory with Arrival Time, ECFAT)规则,使得解的生成过程有适当的判断,更加快速地提高当前代生成解的质量。其次,针对不同的问题规模进行局部搜索的深度做出相应的调整,使得在不同的规模下算法都能有很好的局部搜索能力。展开更多
To explore the precise dynamic response of the levitation system with active controller, a maglev guide way-electromagnet-air spring-cabin coupled model is derived firstly. Based on the mathematical model, it shows th...To explore the precise dynamic response of the levitation system with active controller, a maglev guide way-electromagnet-air spring-cabin coupled model is derived firstly. Based on the mathematical model, it shows that the inherent nonlinearity, inner coupling, misalignments between the sensors and actuators, load uncertainties and external disturbances are the main issues that should be solved in engineering. Under the assumptions that the loads and external disturbance are measurable, the backstepping module controller developed in this work can tackle the above problems effectively. In reality, the load is uncertain due to the additions of luggage and passengers, which will degrade the dynamic performance. A load estimation algorithm is introduced to track the actual load asymptotically and eliminate its influence by tuning the parameters of controller online. Furthermore,considering the external disturbances generated by crosswind, pulling motor and air springs, the extended state observer is employed to estimate and suppress the external disturbance. Finally, results of numerical simulations illustrating closed-loop performance are provided.展开更多
文摘随着经济的发展,在各行各业中分布式生产变得越来越普及,故将更多的注意力放在分布式生产模型之上。为求解带有序相关设置时间和到达时间的零等待分布式流水线调度问题(No-wait Distributed Flow Shop with Sequence Dependent Setup Times and Arrival Times,NDPFSP with SDSTs and RDs),提出了一种自适应的分布估计算法(Adaptive Estimation of Distribution Algorithm, AEDA),用于最小化最大完成时间。首先,提出了更加适合于带到达时间问题的最早完成工厂问题的带有到达时间的最早完成工厂(the Earliest Completion Factory with Arrival Time, ECFAT)规则,使得解的生成过程有适当的判断,更加快速地提高当前代生成解的质量。其次,针对不同的问题规模进行局部搜索的深度做出相应的调整,使得在不同的规模下算法都能有很好的局部搜索能力。
基金Projects(60404003,11202230)supported by the National Natural Science Foundation of China
文摘To explore the precise dynamic response of the levitation system with active controller, a maglev guide way-electromagnet-air spring-cabin coupled model is derived firstly. Based on the mathematical model, it shows that the inherent nonlinearity, inner coupling, misalignments between the sensors and actuators, load uncertainties and external disturbances are the main issues that should be solved in engineering. Under the assumptions that the loads and external disturbance are measurable, the backstepping module controller developed in this work can tackle the above problems effectively. In reality, the load is uncertain due to the additions of luggage and passengers, which will degrade the dynamic performance. A load estimation algorithm is introduced to track the actual load asymptotically and eliminate its influence by tuning the parameters of controller online. Furthermore,considering the external disturbances generated by crosswind, pulling motor and air springs, the extended state observer is employed to estimate and suppress the external disturbance. Finally, results of numerical simulations illustrating closed-loop performance are provided.
