A chip mounter is the core equipment in the production line of the surface-mount technology,which is responsible for finishing the mount operation.It is the most complex and time-consuming stage in the production proc...A chip mounter is the core equipment in the production line of the surface-mount technology,which is responsible for finishing the mount operation.It is the most complex and time-consuming stage in the production process.Therefore,it is of great significance to optimize the load balance and mounting efficiency of the chip mounter and improve the mounting efficiency of the production line.In this study,according to the specific type of chip mounter in the actual production line of a company,a maximum and minimum model is established to minimize the maximum cycle time of the chip mounter in the production line.The production efficiency of the production line can be improved by optimizing the workload scheduling of each chip mounter.On this basis,a hybrid adaptive optimization algorithm is proposed to solve the load scheduling problem of the mounter.The hybrid algorithm is a hybrid of an adaptive genetic algorithm and the improved ant colony algorithm.It combines the advantages of the two algorithms and improves their global search ability and convergence speed.The experimental results show that the proposed hybrid optimization algorithm has a good optimization effect and convergence in the load scheduling problem of chip mounters.展开更多
For sudden drinking water pollution event,reasonable opening or closing valves and hydrants in a water distribution network(WDN),which ensures the isolation and discharge of contaminant as soon as possible,is consider...For sudden drinking water pollution event,reasonable opening or closing valves and hydrants in a water distribution network(WDN),which ensures the isolation and discharge of contaminant as soon as possible,is considered as an effective emergency measure.In this paper,we propose an emergency scheduling algorithm based on evolutionary reinforcement learning(ERL),which can train a good scheduling policy by the combination of the evolutionary computation(EC)and reinforcement learning(RL).Then,the optimal scheduling policy can guide the operation of valves and hydrants in real time based on sensor information,and protect people from the risk of contaminated water.Experiments verify our algorithm can achieve good results and effectively reduce the impact of pollution events.展开更多
基金supported by the National Natural Science Foundation of China(Nos.U1911205,62073300,and 62076225)the National Key Research and Development Program of China(No.2021YFB3301602).
文摘A chip mounter is the core equipment in the production line of the surface-mount technology,which is responsible for finishing the mount operation.It is the most complex and time-consuming stage in the production process.Therefore,it is of great significance to optimize the load balance and mounting efficiency of the chip mounter and improve the mounting efficiency of the production line.In this study,according to the specific type of chip mounter in the actual production line of a company,a maximum and minimum model is established to minimize the maximum cycle time of the chip mounter in the production line.The production efficiency of the production line can be improved by optimizing the workload scheduling of each chip mounter.On this basis,a hybrid adaptive optimization algorithm is proposed to solve the load scheduling problem of the mounter.The hybrid algorithm is a hybrid of an adaptive genetic algorithm and the improved ant colony algorithm.It combines the advantages of the two algorithms and improves their global search ability and convergence speed.The experimental results show that the proposed hybrid optimization algorithm has a good optimization effect and convergence in the load scheduling problem of chip mounters.
基金This work was supported in part by the National Science Foundation of China(Nos.62073300,U1911205,and 62076225).
文摘For sudden drinking water pollution event,reasonable opening or closing valves and hydrants in a water distribution network(WDN),which ensures the isolation and discharge of contaminant as soon as possible,is considered as an effective emergency measure.In this paper,we propose an emergency scheduling algorithm based on evolutionary reinforcement learning(ERL),which can train a good scheduling policy by the combination of the evolutionary computation(EC)and reinforcement learning(RL).Then,the optimal scheduling policy can guide the operation of valves and hydrants in real time based on sensor information,and protect people from the risk of contaminated water.Experiments verify our algorithm can achieve good results and effectively reduce the impact of pollution events.
