Elasto-plastic consolidation is one of the classic coupling questions in geomechanics. To solve this problem, an elasto-plastic constitutive model is derived based on the numerical modeling method. The model is applie...Elasto-plastic consolidation is one of the classic coupling questions in geomechanics. To solve this problem, an elasto-plastic constitutive model is derived based on the numerical modeling method. The model is applied to Blot＇s consolidation theory. Incremental governing partial differential equations are established using this method. According to the stress path, the decoupling condition of these equations is discussed. Based on these conditions, an incremental diffusion equation and uncoupling governing equations are presented. The method is then applied to numerical analyses of three examples. The results show that （1） the effect of the stress path should be taken into account in the simulation of the soil consolidation question; （2） this decoupling method can predict the evolvement of pore water pressure; （3） the settlement using cam-clay model is less than that using numerical model because of dilatancy.展开更多
Adaptive genetic algorithm A SA GA, a novel algorithm, which can dynamically modify the parameters of Genetic Algorithms in terms of simulated annealing mechanism, is proposed for path planning of loosely coordinated ...Adaptive genetic algorithm A SA GA, a novel algorithm, which can dynamically modify the parameters of Genetic Algorithms in terms of simulated annealing mechanism, is proposed for path planning of loosely coordinated multi robot manipulators. Over the task space of a multi robot, a strategy of decoupled planning is also applied to the evolutionary process, which enables a multi robot to avoid falling into deadlock and calculating of composite C space. Finally, two representative tests are given to validate A SA GA and the strategy of decoupled planning.展开更多
文摘Elasto-plastic consolidation is one of the classic coupling questions in geomechanics. To solve this problem, an elasto-plastic constitutive model is derived based on the numerical modeling method. The model is applied to Blot＇s consolidation theory. Incremental governing partial differential equations are established using this method. According to the stress path, the decoupling condition of these equations is discussed. Based on these conditions, an incremental diffusion equation and uncoupling governing equations are presented. The method is then applied to numerical analyses of three examples. The results show that （1） the effect of the stress path should be taken into account in the simulation of the soil consolidation question; （2） this decoupling method can predict the evolvement of pore water pressure; （3） the settlement using cam-clay model is less than that using numerical model because of dilatancy.
文摘Adaptive genetic algorithm A SA GA, a novel algorithm, which can dynamically modify the parameters of Genetic Algorithms in terms of simulated annealing mechanism, is proposed for path planning of loosely coordinated multi robot manipulators. Over the task space of a multi robot, a strategy of decoupled planning is also applied to the evolutionary process, which enables a multi robot to avoid falling into deadlock and calculating of composite C space. Finally, two representative tests are given to validate A SA GA and the strategy of decoupled planning.
文摘针对密集场景中大规模冲突导致多机器人路径规划(Multi-agent path finding,MAPF)成功率低的问题,引入讨价还价博弈机制并以层级协作A^(*)(Hierarchical cooperative A^(*),HCA^(*))算法为内核,提出一种基于讨价还价博弈机制的改进层级协作A^(*)(Bargaining game based improving HCA^(*),B-IHCA^(*))算法.首先,在HCA^(*)算法基础上,对导致路径无解的冲突双方或多方进行讨价还价博弈.由高优先级机器人先出价,当低优先级机器人在该条件下无法求解时,则其将不接受该出价,并通过降约束求解方式进行还价.再由其他冲突方对此做进一步还价,直至各冲突方都能协调得到可接受的路径方案.其次,为避免原始HCA^(*)算法由于高优先级的阻碍陷于过长或反复无效搜索状态,在底层A^(*)搜索环节加入了熔断机制.通过熔断机制与讨价还价博弈相配合可在提升路径求解成功率的同时兼顾路径代价.研究结果表明,所提算法在密集场景大规模机器人路径规划问题上较现有算法求解成功率更高、求解时间更短,路径代价得到改善,验证了算法的有效性.
