To get the movement mode and driving mechanism similar to human shoulder joint,a six degrees of freedom(DOF) serial-parallel bionic shoulder joint mechanism driven by pneumatic muscle actuators(PMAs)was designed.Howev...To get the movement mode and driving mechanism similar to human shoulder joint,a six degrees of freedom(DOF) serial-parallel bionic shoulder joint mechanism driven by pneumatic muscle actuators(PMAs)was designed.However,the structural parameters of the shoulder joint will affect various performances of the mechanism.To obtain the optimal structure parameters,the particle swarm optimization(PSO) was used.Besides,the mathematical expressions of indexes of rotation ranges,maximum bearing torque,discrete dexterity and muscle shrinkage of the bionic shoulder joint were established respectively to represent its many-sided characteristics.And the multi-objective optimization problem was transformed into a single-objective optimization problem by using the weighted-sum method.The normalization method and adaptive-weight method were used to determine each optimization index's weight coefficient;then the particle swarm optimization was used to optimize the integrated objective function of the bionic shoulder joint and the optimal solution was obtained.Compared with the average optimization generations and the optimal target values of many experiments,using adaptive-weight method to adjust weights of integrated objective function is better than using normalization method,which validates superiority of the adaptive-weight method.展开更多
A bionic shoulder joint with three degree-of-freedom(DOF)driven by pneumatic muscle actuator is proposed and its corresponding kinematic model is established.The bionic shoulder is optimized by particle swam optimizat...A bionic shoulder joint with three degree-of-freedom(DOF)driven by pneumatic muscle actuator is proposed and its corresponding kinematic model is established.The bionic shoulder is optimized by particle swam optimization(PSO)with the fitness standards that the requirements of rotation indexes are met and the fluctuation of motion is kept in the lowest resolution in a pneumatic muscle actuator range.Simulation considering rotation indexes only(first simulation)is compared with the one considering both rotation indexes and motion resolution(second simulation)subsequently.Mounting position of the pneumatic muscle actuators in bionic shoulder is optimized after initializing the same condition in simulations.Results show that the fluctuations of parameters are consistent,and the parameters of the first simulation have good convergence than those of the second one.With the increase of stretch rate of the pneumatic muscle actuator,the needed length of fixed link in the center of static platform decreases in optimization.展开更多
为了更好的实现外骨骼上肢康复机械臂仿人的康复动作,即在手臂自然下垂状态下,实现大臂的直接外展动作,本文通过分析人体肩关节的结构和基本动作以及部分已存在的外骨骼机械臂肩关节的不足,对运动模型进行简化,设计了一种三自由度外骨...为了更好的实现外骨骼上肢康复机械臂仿人的康复动作,即在手臂自然下垂状态下,实现大臂的直接外展动作,本文通过分析人体肩关节的结构和基本动作以及部分已存在的外骨骼机械臂肩关节的不足,对运动模型进行简化,设计了一种三自由度外骨骼式肩关节。该设计应用在外骨骼机械臂上,可以使机械臂在手臂自然下垂状态下实现外展/内收、前屈/后展、水平外展/水平内收3个基本动作,这样的三自由度(degree of freedom,DOF)联动,可以使外骨骼机械臂实现的日常功能动作更符合人体关节的生理需求,更接近人体自然运动规律。而且三维模型运动模拟结果表明,此设计可达到预期的仿人运动效果。该研究对临床康复仿生运动具有积极意义。展开更多
基金the National Natural Science Foundation of China(NO.51405229)the Natural Science Foundation of Jiangsu Province of China(Nos.BK20151470 and BK20130796)
文摘To get the movement mode and driving mechanism similar to human shoulder joint,a six degrees of freedom(DOF) serial-parallel bionic shoulder joint mechanism driven by pneumatic muscle actuators(PMAs)was designed.However,the structural parameters of the shoulder joint will affect various performances of the mechanism.To obtain the optimal structure parameters,the particle swarm optimization(PSO) was used.Besides,the mathematical expressions of indexes of rotation ranges,maximum bearing torque,discrete dexterity and muscle shrinkage of the bionic shoulder joint were established respectively to represent its many-sided characteristics.And the multi-objective optimization problem was transformed into a single-objective optimization problem by using the weighted-sum method.The normalization method and adaptive-weight method were used to determine each optimization index's weight coefficient;then the particle swarm optimization was used to optimize the integrated objective function of the bionic shoulder joint and the optimal solution was obtained.Compared with the average optimization generations and the optimal target values of many experiments,using adaptive-weight method to adjust weights of integrated objective function is better than using normalization method,which validates superiority of the adaptive-weight method.
基金supported by the National Natural Science Foundation of China(No.51405229)the Natural Science Foundation of Jiangsu Province of China (No. BK20151470)the NUAA Fundamental Research Fund(No.NS2013049)
文摘A bionic shoulder joint with three degree-of-freedom(DOF)driven by pneumatic muscle actuator is proposed and its corresponding kinematic model is established.The bionic shoulder is optimized by particle swam optimization(PSO)with the fitness standards that the requirements of rotation indexes are met and the fluctuation of motion is kept in the lowest resolution in a pneumatic muscle actuator range.Simulation considering rotation indexes only(first simulation)is compared with the one considering both rotation indexes and motion resolution(second simulation)subsequently.Mounting position of the pneumatic muscle actuators in bionic shoulder is optimized after initializing the same condition in simulations.Results show that the fluctuations of parameters are consistent,and the parameters of the first simulation have good convergence than those of the second one.With the increase of stretch rate of the pneumatic muscle actuator,the needed length of fixed link in the center of static platform decreases in optimization.
文摘为了更好的实现外骨骼上肢康复机械臂仿人的康复动作,即在手臂自然下垂状态下,实现大臂的直接外展动作,本文通过分析人体肩关节的结构和基本动作以及部分已存在的外骨骼机械臂肩关节的不足,对运动模型进行简化,设计了一种三自由度外骨骼式肩关节。该设计应用在外骨骼机械臂上,可以使机械臂在手臂自然下垂状态下实现外展/内收、前屈/后展、水平外展/水平内收3个基本动作,这样的三自由度(degree of freedom,DOF)联动,可以使外骨骼机械臂实现的日常功能动作更符合人体关节的生理需求,更接近人体自然运动规律。而且三维模型运动模拟结果表明,此设计可达到预期的仿人运动效果。该研究对临床康复仿生运动具有积极意义。
