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A simplified lower-limb exoskeleton model was established for the prototype, and the D-H parameter method was used to perform dynamic analysis. Joint angles were measured experimentally and used as inputs for the controller. To address the robot's trajectory tracking problem, traditional PID control was employed, showing good tracking performance but slow response and parameter tuning speed. Although PSO(particle swarm optimization) accelerated the parameter tuning, issues with low convergence accuracy and local optimum traps persisted. Therefore, a PID control based on a chaotic-mapping improved PSO algorithm was designed. The results show that the randomness was enhanced, the parameter tuning speed was increased, and the tracking error was reduced. Simscape was used for visual simulation of joint angles, and the control performance was further validated through various experiments.
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针对样机建立简化的下肢外骨骼模型,应用D-H参数法进行动力学分析,并通过实验测得关节角度后进行拟合作为控制器输入。为了解决机器人的轨迹跟踪问题,利用传统PID控制拥有较好的跟随效果,但存在响应和寻参速度慢等问题;结合粒子群算法后虽然寻参速度加快,仍出现收敛精度低以及易陷入局部最优解的问题,因此设计了一种基于混沌映射型改进粒子群算法的PID控制。结果表明,改进后随机性增强,寻参速度加快,跟踪误差更小;并采用Simscape将关节角度进行可视化仿真,结合实验多方面验证控制效果。
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凌六一(1980—),男,汉族,安徽合肥人,博士,教授。研究方向:检测技术与智能信息处理。E-mail:lyling@aust.edu.cn。
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凌六一(1980—),男,汉族,安徽合肥人,博士,教授。研究方向:检测技术与智能信息处理。E-mail:lyling@aust.edu.cn。
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机械结构模型, figureFileSmall=JeqZnn52ET8xyFPN4R/LqQ==, figureFileBig=al7TRVh6YUL0aZYzFqG1Wg==, tableContent=null), ArticleFig(id=1179434009214988371, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149769462745842647, language=EN, label=Fig.2, caption=
Experimental prototype, figureFileSmall=UTIWHkWgU8dlXHAbBrR2Aw==, figureFileBig=lMFXmikeoLGb3/OeXpBcfw==, tableContent=null), ArticleFig(id=1179434009277902932, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149769462745842647, language=CN, label=图2, caption=
实验样机, figureFileSmall=UTIWHkWgU8dlXHAbBrR2Aw==, figureFileBig=lMFXmikeoLGb3/OeXpBcfw==, tableContent=null), ArticleFig(id=1179434009345011797, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149769462745842647, language=EN, label=Fig.3, caption=
D-H parameter annotation diagram of lower limb, figureFileSmall=rChBCEx7R8BpOwj8HMcqaQ==, figureFileBig=q0A6b4NBrmJvMfNBUViWCw==, tableContent=null), ArticleFig(id=1179434009399537750, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149769462745842647, language=CN, label=图3, caption=
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Kinematic verification based on robotics toolbox, figureFileSmall=awNn2f67H4URAQ3MbxEGzA==, figureFileBig=nutlqmE2gaYL5BmeTDdmpw==, tableContent=null), ArticleFig(id=1179434009525366872, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149769462745842647, language=CN, label=图4, caption=
基于robotics工具箱的运动学验证, figureFileSmall=awNn2f67H4URAQ3MbxEGzA==, figureFileBig=nutlqmE2gaYL5BmeTDdmpw==, tableContent=null), ArticleFig(id=1179434009592475737, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149769462745842647, language=EN, label=Fig.5, caption=
Parameter annotation diagram, figureFileSmall=mS7pui45xZ78P2jvWGNRMQ==, figureFileBig=UZ2INzgJT/OimEFS5om/2A==, tableContent=null), ArticleFig(id=1179434009663778906, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149769462745842647, language=CN, label=图5, caption=
参数标注图 和 分别为髋关节和膝关节角度; 和 为人体大腿和小腿的长度; 和 为大腿和小腿的质量; 为大腿关节到质心的距离; 为小腿关节到质心的距离
, figureFileSmall=mS7pui45xZ78P2jvWGNRMQ==, figureFileBig=UZ2INzgJT/OimEFS5om/2A==, tableContent=null), ArticleFig(id=1179434009722499163, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149769462745842647, language=EN, label=Fig.6, caption=
Fitting curve of motor end friction force, figureFileSmall=/6Q/ODGsEXwrGZts/u1OmQ==, figureFileBig=oymKXB9z7P7GzQs5Ln/2yA==, tableContent=null), ArticleFig(id=1179434009781219420, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149769462745842647, language=CN, label=图6, caption=
电机端摩擦力拟合曲线, figureFileSmall=/6Q/ODGsEXwrGZts/u1OmQ==, figureFileBig=oymKXB9z7P7GzQs5Ln/2yA==, tableContent=null), ArticleFig(id=1179434009835745373, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149769462745842647, language=EN, label=Fig.7, caption=
Knee joint encoder acquisition, figureFileSmall=HeaCqg83CbJur1NMZrrnTg==, figureFileBig=B8GMZfQFnBqr4jKoGq1fuw==, tableContent=null), ArticleFig(id=1179434009898659934, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149769462745842647, language=CN, label=图7, caption=
膝关节编码器采集, figureFileSmall=HeaCqg83CbJur1NMZrrnTg==, figureFileBig=B8GMZfQFnBqr4jKoGq1fuw==, tableContent=null), ArticleFig(id=1179434009961574495, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149769462745842647, language=EN, label=Fig.8, caption=
Collection results, figureFileSmall=B53sMXEbkkQbcKNrKTUL4g==, figureFileBig=UoOZwuMJ3WiwDcDUmzH4OA==, tableContent=null), ArticleFig(id=1179434010028683360, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149769462745842647, language=CN, label=图8, caption=
采集结果, figureFileSmall=B53sMXEbkkQbcKNrKTUL4g==, figureFileBig=UoOZwuMJ3WiwDcDUmzH4OA==, tableContent=null), ArticleFig(id=1179434010116763745, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149769462745842647, language=EN, label=Fig.9, caption=
PID control system block diagram, figureFileSmall=XSiRDpmsJeTJ+FCy4HneiQ==, figureFileBig=KXLGHR2wFXF70rw+3QeUWw==, tableContent=null), ArticleFig(id=1179434010179678306, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149769462745842647, language=CN, label=图9, caption=
PID控制系统框图, figureFileSmall=XSiRDpmsJeTJ+FCy4HneiQ==, figureFileBig=KXLGHR2wFXF70rw+3QeUWw==, tableContent=null), ArticleFig(id=1179434010276147299, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149769462745842647, language=EN, label=Fig.10, caption=
Flow chart of improved PSO control algorithm, figureFileSmall=iSFzbHjFDVsBfd93wOWDAw==, figureFileBig=yS2XmIFuUxevP6/2SzFjAA==, tableContent=null), ArticleFig(id=1179434010326478948, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149769462745842647, language=CN, label=图10, caption=
改进PSO控制算法流程图, figureFileSmall=iSFzbHjFDVsBfd93wOWDAw==, figureFileBig=yS2XmIFuUxevP6/2SzFjAA==, tableContent=null), ArticleFig(id=1179434010385199205, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149769462745842647, language=EN, label=Fig.11, caption=
Convergence curve of fitness function, figureFileSmall=6HqiEMTm+J60dgCvbqekvg==, figureFileBig=oxpR/I+xLZuW1PD5r3Mq9w==, tableContent=null), ArticleFig(id=1179434010448113766, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149769462745842647, language=CN, label=图11, caption=
适应度函数收敛曲线, figureFileSmall=6HqiEMTm+J60dgCvbqekvg==, figureFileBig=oxpR/I+xLZuW1PD5r3Mq9w==, tableContent=null), ArticleFig(id=1179434010502639719, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149769462745842647, language=EN, label=Fig.12, caption=
Step response curve, figureFileSmall=8Ys8OLReAH0K6UXKcm6EtA==, figureFileBig=PLxA8wXtY/CoQHb3A+1Mxg==, tableContent=null), ArticleFig(id=1179434010548777064, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149769462745842647, language=CN, label=图12, caption=
阶跃响应曲线, figureFileSmall=8Ys8OLReAH0K6UXKcm6EtA==, figureFileBig=PLxA8wXtY/CoQHb3A+1Mxg==, tableContent=null), ArticleFig(id=1179434010599108713, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149769462745842647, language=EN, label=Fig.13, caption=
Joint trajectory planning results, figureFileSmall=gEQ+mrFTNyA+mnFSiUicEg==, figureFileBig=E/6glwQq+PddPuxDX009vQ==, tableContent=null), ArticleFig(id=1179434010641051754, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149769462745842647, language=CN, label=图13, caption=
关节轨迹规划结果, figureFileSmall=gEQ+mrFTNyA+mnFSiUicEg==, figureFileBig=E/6glwQq+PddPuxDX009vQ==, tableContent=null), ArticleFig(id=1179434010712354923, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149769462745842647, language=EN, label=Fig.14, caption=
Simscape dynamics simulation interface, figureFileSmall=4b5exp2UP49VRUkNxb2gEA==, figureFileBig=znVKjtLfZ+dxZtpxdJFFxg==, tableContent=null), ArticleFig(id=1179434010766880876, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149769462745842647, language=CN, label=图14, caption=
Simscape动力学仿真界面, figureFileSmall=4b5exp2UP49VRUkNxb2gEA==, figureFileBig=znVKjtLfZ+dxZtpxdJFFxg==, tableContent=null), ArticleFig(id=1179434010829795437, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149769462745842647, language=EN, label=Fig.15, caption=
Simscape angle data output diagram, figureFileSmall=vFzBuAym7M1dgrXvwkXRlQ==, figureFileBig=PZwbQ7kSDA3vWO2ur5W1hg==, tableContent=null), ArticleFig(id=1179434010896904302, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149769462745842647, language=CN, label=图15, caption=
Simscape角度数据输出图, figureFileSmall=vFzBuAym7M1dgrXvwkXRlQ==, figureFileBig=PZwbQ7kSDA3vWO2ur5W1hg==, tableContent=null), ArticleFig(id=1179434010964013167, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149769462745842647, language=EN, label=Fig.16, caption=
Exoskeleton wearing experiment, figureFileSmall=IVHd55tZ+x+AEZjJrYp8Dw==, figureFileBig=KXgZItG7rJuFdzaAjtZVNw==, tableContent=null), ArticleFig(id=1179434011026927728, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149769462745842647, language=CN, label=图16, caption=
外骨骼穿戴实验, figureFileSmall=IVHd55tZ+x+AEZjJrYp8Dw==, figureFileBig=KXgZItG7rJuFdzaAjtZVNw==, tableContent=null), ArticleFig(id=1179434011089842289, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149769462745842647, language=EN, label=Fig.17, caption=
Experimental gait periodogram, figureFileSmall=kkGgbkvSYnOiU58WmRWKdw==, figureFileBig=pL11x6HMy6YOn/in4CEJuA==, tableContent=null), ArticleFig(id=1179434011173728370, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149769462745842647, language=CN, label=图17, caption=
实验步态周期图, figureFileSmall=kkGgbkvSYnOiU58WmRWKdw==, figureFileBig=pL11x6HMy6YOn/in4CEJuA==, tableContent=null), ArticleFig(id=1179434011245031539, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149769462745842647, language=EN, label=Fig.18, caption=
The angles of each joint in the experiment, figureFileSmall=W1l/1PMsWSfp4hsEw9aDPA==, figureFileBig=jX2X6DPMRUPArkTpPETOMw==, tableContent=null), ArticleFig(id=1179434011312140404, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149769462745842647, language=CN, label=图18, caption=
实验中各关节角度, figureFileSmall=W1l/1PMsWSfp4hsEw9aDPA==, figureFileBig=jX2X6DPMRUPArkTpPETOMw==, tableContent=null), ArticleFig(id=1179434011375054965, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149769462745842647, language=EN, label=Fig.19, caption=
Comparison of fitness values of different PSO algorithms, figureFileSmall=nYsy3GnBQkL6V1rQYoMINw==, figureFileBig=dgnxo95R1iiC3Ns7bEO1pA==, tableContent=null), ArticleFig(id=1179434011425386614, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149769462745842647, language=CN, label=图19, caption=
不同PSO算法适应度值对比图, figureFileSmall=nYsy3GnBQkL6V1rQYoMINw==, figureFileBig=dgnxo95R1iiC3Ns7bEO1pA==, tableContent=null), ArticleFig(id=1179434011488301175, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149769462745842647, language=EN, label=Table 1, caption=
Joint motor parameters
, figureFileSmall=null, figureFileBig=null, tableContent=
| 电机性能参数 | 具体数值 |
| 额定电压/V | 48 |
| 额定功率/W | 150 |
| 额定力矩/(N·m) | 47 |
| 减速比 | 101 |
| 减速机型号 | LHS-20-100 |
| 通讯方式 | EtherCAT |
| 额定转速/(r·min-1) | 29.7 |
), ArticleFig(id=1179434011555410040, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149769462745842647, language=CN, label=表1, caption=
关节电机参数
, figureFileSmall=null, figureFileBig=null, tableContent=
| 电机性能参数 | 具体数值 |
| 额定电压/V | 48 |
| 额定功率/W | 150 |
| 额定力矩/(N·m) | 47 |
| 减速比 | 101 |
| 减速机型号 | LHS-20-100 |
| 通讯方式 | EtherCAT |
| 额定转速/(r·min-1) | 29.7 |
), ArticleFig(id=1179434011614130297, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149769462745842647, language=EN, label=Table 2, caption=
D-H parameters of lower limb exoskeleton
, figureFileSmall=null, figureFileBig=null, tableContent=
| 连杆i | 关节角θi | 连杆偏距di | 扭角ɑ | 连杆长度ai |
| 0~1 | 0 | d1 | 0 | l0 |
| 1~2 | θ1 | 0 | 0 | l1 |
| 2~3 | θ2 | 0 | 0 | l2 |
| 3~4 | θ3 | 0 | 0 | l3 |
), ArticleFig(id=1179434011672850554, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149769462745842647, language=CN, label=表2, caption=
下肢外骨骼D-H参数
, figureFileSmall=null, figureFileBig=null, tableContent=
| 连杆i | 关节角θi | 连杆偏距di | 扭角ɑ | 连杆长度ai |
| 0~1 | 0 | d1 | 0 | l0 |
| 1~2 | θ1 | 0 | 0 | l1 |
| 2~3 | θ2 | 0 | 0 | l2 |
| 3~4 | θ3 | 0 | 0 | l3 |
), ArticleFig(id=1179434011735765115, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149769462745842647, language=EN, label=Table 3, caption=
Basic parameters table
, figureFileSmall=null, figureFileBig=null, tableContent=
| 参数 | 对应数值 |
| 迭代次数 | 100 |
| 种群数 | 50 |
| 优化变量上限 | [100,200,10] |
| 优化变量下限 | [0.01,0,0] |
| 维度 | 3 |
| 个人学习因子c1 | 1.2 |
| 社会学习因子c2 | 1.2 |
| 惯性权重ω | 0.8 |
| 混沌映射类型 | Chebyshev映射 |
), ArticleFig(id=1179434011807068284, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149769462745842647, language=CN, label=表3, caption=
基本参数表
, figureFileSmall=null, figureFileBig=null, tableContent=
| 参数 | 对应数值 |
| 迭代次数 | 100 |
| 种群数 | 50 |
| 优化变量上限 | [100,200,10] |
| 优化变量下限 | [0.01,0,0] |
| 维度 | 3 |
| 个人学习因子c1 | 1.2 |
| 社会学习因子c2 | 1.2 |
| 惯性权重ω | 0.8 |
| 混沌映射类型 | Chebyshev映射 |
), ArticleFig(id=1179434011869982845, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149769462745842647, language=EN, label=Table 4, caption=
Setting results and performance indicators
, figureFileSmall=null, figureFileBig=null, tableContent=
| 次数 | σ/% | ts/s | Kp | Ki | Kd |
| 1 | 4.497 | 0.120 | 27.662 | 5.433 | 0.504 |
| 2 | 4.006 | 0.120 | 30.925 | 4.977 | 0.479 |
| 3 | 4.829 | 0.120 | 7.383 | 20.212 | 0.010 |
| 4 | 3.893 2 | 0.120 | 14.457 4 | 10.516 | 0.344 |
| 5 | 4.703 6 | 0.120 | 38.285 | 3.912 | 0.548 |
), ArticleFig(id=1179434011928703102, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149769462745842647, language=CN, label=表4, caption=
整定结果与性能指标
, figureFileSmall=null, figureFileBig=null, tableContent=
| 次数 | σ/% | ts/s | Kp | Ki | Kd |
| 1 | 4.497 | 0.120 | 27.662 | 5.433 | 0.504 |
| 2 | 4.006 | 0.120 | 30.925 | 4.977 | 0.479 |
| 3 | 4.829 | 0.120 | 7.383 | 20.212 | 0.010 |
| 4 | 3.893 2 | 0.120 | 14.457 4 | 10.516 | 0.344 |
| 5 | 4.703 6 | 0.120 | 38.285 | 3.912 | 0.548 |
), ArticleFig(id=1179434012025172095, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149769462745842647, language=EN, label=Table 5, caption=
Evaluation of tracking error effects for each joint
, figureFileSmall=null, figureFileBig=null, tableContent=
| 部位 | 均方差 | 均方根误差 | 平均值 |
| 左髋 | 9.228 7×10-4 | 0.030 4 | 0.027 9 |
| 左膝 | 1.903 4×10-5 | 0.004 4 | 0.002 0 |
| 右髋 | 1.155 7×10-2 | 0.107 5 | 0.105 8 |
| 右膝 | 9.181 3×10-5 | 0.009 6 | -0.004 7 |
), ArticleFig(id=1179434012092280960, tenantId=1146029695717560320, journalId=1146123166801305609, articleId=1149769462745842647, language=CN, label=表5, caption=
各关节跟踪误差效果评价
, figureFileSmall=null, figureFileBig=null, tableContent=
| 部位 | 均方差 | 均方根误差 | 平均值 |
| 左髋 | 9.228 7×10-4 | 0.030 4 | 0.027 9 |
| 左膝 | 1.903 4×10-5 | 0.004 4 | 0.002 0 |
| 右髋 | 1.155 7×10-2 | 0.107 5 | 0.105 8 |
| 右膝 | 9.181 3×10-5 | 0.009 6 | -0.004 7 |
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