考虑奇异摄动的船用水下机械臂轨迹自适应规划方法

为保证船用水下机械臂在具有奇异摄动、不确定性和动态特性变化的环境中,平稳完成作业任务,研究考虑奇异摄动的船用水下机械臂轨迹自适应规划方法。将复杂的水下机械臂结构划分成慢变和快变2个子系统,分析奇异摄动的船用水下机械臂状态后,研究奇异摄动抑制下水下机械臂自适应轨迹规划方法,设计奇异摄动影响下机械臂作业振动量最小化的轨迹规划目标函数,并由狼群优化算法求解满足此目标函数目标的关节角位移、角速度和角加速度规划方案。将所求解的关节角位移、角速度和角加速度输入自适应模糊PID跟踪控制器,实现奇异摄动抑制轨迹自适应生成。实验结果表明,该方法可在奇异摄动环境中,为机械臂自适应规划平稳的作业轨迹,且机械臂末端振动位移得到了有效抑制。

An automatic grid generation approach over free-form surface for architectural design

An essential step for the realization of free-form surface structures is to create an efficient structural gird that satisfies not only the architectural aesthetics,but also the structural performance.Employing the main stress trajectories as the representation of force flows on a free-form surface,an automatic grid generation approach is proposed for the architectural design.The algorithm automatically plots the main stress trajectories on a 3D free-form surface,and adopts a modified advancing front meshing technique to generate the structural grid.Based on the proposed algorithm,an automatic grid generator named "St-Surmesh" is developed for the practical architectural design of free-form surface structure.The surface geometry of one of the Sun Valleys in Expo Axis for the Expo Shanghai 2010 is selected as a numerical example for validating the proposed approach.Comparative studies are performed to demonstrate how different structural grids affect the design of a free-form surface structure.