Journal of Mechanisms and Robotics-Transactions of the Asme最新文献_第10页

Performance Analysis and Optimal Design of a Novel Schöenflies-Motion Asymmetric Parallel Mechanism 一种新型Schöenflies-Motion非对称并联机构性能分析与优化设计

IF 2.6 4区计算机科学

Journal of Mechanisms and Robotics-Transactions of the Asme Pub Date : 2023-03-17 DOI: 10.1115/1.4062149

Wei Zhu, Xueyang Zhu, Zhiyuan Ma, Huiping Shen

{"title":"Performance Analysis and Optimal Design of a Novel Schöenflies-Motion Asymmetric Parallel Mechanism","authors":"Wei Zhu, Xueyang Zhu, Zhiyuan Ma, Huiping Shen","doi":"10.1115/1.4062149","DOIUrl":"https://doi.org/10.1115/1.4062149","url":null,"abstract":"\u0000 Since previous studies of parallel mechanisms (PMs) have tended to favor symmetrical overall configuration to obtain relatively stable kinematic and dynamic performance and to satisfy isotropic requirements. The analysis of kinematic and dynamic performance of asymmetric mechanisms has been an issue of interest. In this paper, an asymmetric SCARA-type PM with 4 degrees-of-freedom (DOF) is proposed. First, the orientation characteristic set is calculated to obtain the DOF of the PM. Then, the inverse kinematics and the velocity and acceleration of each branch chain of the mechanism is analyzed. The dynamic model of the mechanism is established according to the principle of virtual work. The workspace of the mechanism is drawn according to the constraints that have been given to the mechanism's kinematic pairs. The singularity, dexterity, motion/force transfer performance and maximum acceleration performance of the mechanism are also analyzed. On this basis, the kinematic and dynamic performance evaluation indexes of the mechanism are studied. Finally, the workspace and acceleration performance of the mechanism are optimized based on the differential evolution algorithm (DE) to obtain the structural parameters when the mechanism achieves optimal performance. The asymmetric PM proposed in this paper, as well as the algorithm of performance index and optimization method used can provide some reference value for configuration design and optimization analysis.","PeriodicalId":49155,"journal":{"name":"Journal of Mechanisms and Robotics-Transactions of the Asme","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2023-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43439532","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Designing and Analyzing Multistable Mechanisms Using Quadrilateral Boundary Rigid Origami 基于四边形边界刚性折纸的多稳定机构设计与分析

IF 2.6 4区计算机科学

Journal of Mechanisms and Robotics-Transactions of the Asme Pub Date : 2023-03-13 DOI: 10.1115/1.4062132

Mun-jae Lee, Yuki Miyajima, Tomohiro Tachi

引用次数: 0

Three-dimensional Mobile Assemblies based on Threefold-symmetric Bricard Linkages 基于三重对称Bricard连杆的三维移动装配

IF 2.6 4区计算机科学

Journal of Mechanisms and Robotics-Transactions of the Asme Pub Date : 2023-03-13 DOI: 10.1115/1.4062131

Xiao Zhang, Xin Zhou, Ming Li, Tianming Liu, Jian Xing, Weilin Lv, Fufu Yang, Yan Chen

引用次数: 0

EMBEDDED LINEAR-MOTION DEVELOPABLE MECHANISMS ON CYLINDRICAL SURFACES 圆柱形表面上的嵌入式直线运动可展机构

IF 2.6 4区计算机科学

Journal of Mechanisms and Robotics-Transactions of the Asme Pub Date : 2023-03-13 DOI: 10.1115/1.4062133

Jacob Sheffield, Brandon Sargent, L. Howell

引用次数: 0

Design and implementation of a synergy-based cable-driven humanoid arm with variable stiffness 基于协同的变刚度索驱动类人机械臂的设计与实现

IF 2.6 4区计算机科学

Journal of Mechanisms and Robotics-Transactions of the Asme Pub Date : 2023-03-13 DOI: 10.1115/1.4062130

Hang Xiao, Jianyin Tang, Shengnan Lyu, Kun Xu, Xilun Ding

{"title":"Design and implementation of a synergy-based cable-driven humanoid arm with variable stiffness","authors":"Hang Xiao, Jianyin Tang, Shengnan Lyu, Kun Xu, Xilun Ding","doi":"10.1115/1.4062130","DOIUrl":"https://doi.org/10.1115/1.4062130","url":null,"abstract":"\u0000 Cable-driven arms have the advantages of light weight, large workspace, good compliance, high speed and acceleration. This paper proposes a cable-driven variable stiffness humanoid arm that can reproduce typical daily postures of the upper limb with a few actuators via kinematic synergy. A kinematic model of the arm is established to obtain the design parameters corresponding to different postures. The dimension reduction of the actuation is realized through a synergy analysis of the driving cables. A coupling actuation mechanism is designed to reduce the number of actuators required to generate specific postures of the arm via cables. Optimization of the geometric parameters of the joints is conducted to improve the posture reproduction accuracy. The stiffness of the arm could be regulated by adjusting the cable tension. Stiffness modeling of the joint is performed to evaluate the influence of cable tension. A prototype of the arm is designed. The workspace is analyzed under the actuation of the designed coupling mechanism. The transformation among the targeted postures is simulated to validate the feasibility of the actuation dimension reduction design of the arm. Robustness analysis is conducted which indicates the use of synergic actuation weakens the arm robustness. With the proposed dimension reduction method, the actuation dimensions are reduced from 9 to 4, which leads to the diminution of reachable workspace and manipulability. The reproduction accuracy of the targeted postures is 90.4%. The proposed method can be applied to the dimension reduction designs of other cable-driven robots.","PeriodicalId":49155,"journal":{"name":"Journal of Mechanisms and Robotics-Transactions of the Asme","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2023-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44663648","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Stiffness Modeling and Deformation Analysis of Parallel Manipulators Based on the Principal Axes Decomposition of Compliance Matrices 基于柔度矩阵主轴分解的并联机器人刚度建模与变形分析

IF 2.6 4区计算机科学

Journal of Mechanisms and Robotics-Transactions of the Asme Pub Date : 2023-03-13 DOI: 10.1115/1.4062134

Shuangshuang Zhang, Linsong Zhang

{"title":"Stiffness Modeling and Deformation Analysis of Parallel Manipulators Based on the Principal Axes Decomposition of Compliance Matrices","authors":"Shuangshuang Zhang, Linsong Zhang","doi":"10.1115/1.4062134","DOIUrl":"https://doi.org/10.1115/1.4062134","url":null,"abstract":"\u0000 This paper presents a general equivalent approach to solve the stiffness modeling, or load-deformation problem of parallel mechanisms. Based on the principal axes decomposition of structure compliance matrices, an equivalent 6-DOF serial mechanism is established to approximate the load-deformation behavior of each flexible link in the mechanism. Hence, each limb of the parallel mech-anism can be equivalent to a serial redundant rigid body mechanism with passive elastic joints, and the load-deformation problem can be transformed to the equilibrium configuration calculation of the equivalent mechanism. The main advantage of the proposed method is that the robotic kinematics and statics, rather than the elastic mechanics, can be directly adopted to solve the equilibrium configura-tion of the parallel mechanism under external load. Besides, a closed form solution of the corre-sponding deformation can be obtained, which can be solved by the gradient-based searching algo-rithm. Therefore, the final deformation will no longer be linear to the external load, which makes this method more accurate and more suitable for the deformation prediction and compensation in real industrial working conditions. In order to verify the effectiveness and correctness of this method, a 3PRRU parallel manipulator will be introduced as an example, to compare the load-deformation results with the FEA simulation and matrix calculation methods, so the nonlinearity feature can be shown in an intuitive manner.","PeriodicalId":49155,"journal":{"name":"Journal of Mechanisms and Robotics-Transactions of the Asme","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2023-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48220752","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Partition-Aware Stability Control for Humanoid Robot Push Recovery With Whole-Body Capturability 具有全身可捕获性的仿人机器人推恢复的分区感知稳定性控制

4区计算机科学

Journal of Mechanisms and Robotics-Transactions of the Asme Pub Date : 2023-03-08 DOI: 10.1115/1.4056956

Hyunjong Song, William Peng, Joo H. Kim

{"title":"Partition-Aware Stability Control for Humanoid Robot Push Recovery With Whole-Body Capturability","authors":"Hyunjong Song, William Peng, Joo H. Kim","doi":"10.1115/1.4056956","DOIUrl":"https://doi.org/10.1115/1.4056956","url":null,"abstract":"Abstract For successful push recovery in response to perturbations, a humanoid robot must select an appropriate stabilizing action. Existing approaches are limited because they are often derived from reduced-order models that ignore system-specific aspects such as swing leg dynamics or kinematic and actuation limits. In this study, the formulation of capturability for whole-body humanoid robots is introduced as a partition-based approach in the augmented center-of-mass (COM)-state space. The 1-step capturable boundary is computed from an optimization-based method that incorporates whole-body system properties with full-order nonlinear system dynamics in the sagittal plane including contact interactions with the ground and conditions for achieving a complete stop after stepping. The 1-step capturable boundary, along with the balanced state boundaries, are used to quantify the relative contributions of different strategies and contacts in maintaining or recovering balance in push recovery. The computed boundaries are also incorporated as explicit criteria into a partition-aware push recovery controller that monitors the robot’s COM state to selectively exploit the ankle, hip, or captured stepping strategies. The push recovery simulation experiments demonstrated the validity of the stability boundaries in fully exploiting a humanoid robot’s balancing capability through appropriate balancing actions in response to perturbations. Overall, the system-specific capturability with the whole-body system properties and dynamics outperformed that derived from a typical reduced-order model.","PeriodicalId":49155,"journal":{"name":"Journal of Mechanisms and Robotics-Transactions of the Asme","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136178992","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Development of a Novel 4-DOF Flexible Endoscopic Robot Using Cable-driven Multi-segment Continuum Mechanisms 一种新型四自由度柔性内窥镜机器人的研制

IF 2.6 4区计算机科学

Journal of Mechanisms and Robotics-Transactions of the Asme Pub Date : 2023-03-08 DOI: 10.1115/1.4057075

Zhengyu Wang, Shiyang Bao, Bin Zi, Zirui Jia, Xiang Yu

引用次数: 1

A Novel Variable Stiffness Compliant Robotic Link Based on Discrete Variable Stiffness Units for Safe Human–Robot Interaction 基于离散变刚度单元的新型变刚度柔性机器人连杆安全人机交互

4区计算机科学

Journal of Mechanisms and Robotics-Transactions of the Asme Pub Date : 2023-03-08 DOI: 10.1115/1.4056957

Jiaming Fu, Ziqing Yu, Han Lin, Lianxi Zheng, Dongming Gan

{"title":"A Novel Variable Stiffness Compliant Robotic Link Based on Discrete Variable Stiffness Units for Safe Human–Robot Interaction","authors":"Jiaming Fu, Ziqing Yu, Han Lin, Lianxi Zheng, Dongming Gan","doi":"10.1115/1.4056957","DOIUrl":"https://doi.org/10.1115/1.4056957","url":null,"abstract":"Abstract Variable stiffness manipulators balance the trade-off between manipulation performance needing high stiffness and safe human–robot interaction desiring low stiffness. Variable stiffness links enable this flexible manipulation function during human–robot interaction. In this paper, we propose a novel variable stiffness link based on discrete variable stiffness units (DSUs). A DSU is a parallel guided beam that can adjust stiffness discretely by changing the cross-sectional area properties of the hollow beam segments. The variable stiffness link (Tri-DSU) consists of three tandem DSUs to achieve eight stiffness modes and a stiffness ratio of 31. To optimize the design, stiffness analysis of the DSU and Tri-DSU under various configurations and forces was performed by a derived linear analytical model which applies to small/intermediate deflections. The model is derived using the approach of serially connected beams and superposition combinations. 3D-Printed prototypes were built to verify the feature and performance of the Tri-DSU in comparison with the finite element analysis and analytical model results. It’s demonstrated that our model can accurately predict the stiffnesses of the DSU and Tri-DSU within a certain range of parameters. Impact tests were also conducted to validate the performance of the Tri-DSU. The developed method and analytical model are extendable to multiple DSUs with parameter configurations to achieve modularization and customization, and also provide a tool for the design of reconfigurable collaborative robot (cobot) manipulators.","PeriodicalId":49155,"journal":{"name":"Journal of Mechanisms and Robotics-Transactions of the Asme","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136178991","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Light-weight Design of 5-DoF hybrid robot for assembling in the cabin 舱内组装5-DoF混合机器人的轻量化设计

IF 2.6 4区计算机科学

Journal of Mechanisms and Robotics-Transactions of the Asme Pub Date : 2023-03-08 DOI: 10.1115/1.4057074

Binbin Lian, Pan Feng, Jin Wu, J. Ma, Yuan Zhang, Yimin Song

{"title":"Light-weight Design of 5-DoF hybrid robot for assembling in the cabin","authors":"Binbin Lian, Pan Feng, Jin Wu, J. Ma, Yuan Zhang, Yimin Song","doi":"10.1115/1.4057074","DOIUrl":"https://doi.org/10.1115/1.4057074","url":null,"abstract":"\u0000 Interior assembling inside the cabin of an aircraft requires assembling robot to be light-weight and able to carry heavy payload. This paper proposed a hybrid robot, carried out its optimal design and experiments. The robot consists of a 1T2R parallel module and a 2T serial module. In the parallel module, the 1st limb is composed of a slider-crank mechanism and a RS link. The other two limbs are PRS limbs. Herein, R, S, P are revolute, spherical and actuated prismatic joints. Optimization of the robot concerns motion/force transmissibility, total mass and stiffness. Hence, kinematic, stiffness and mass modeling are implemented, and then the Pareto-based multi-objective optimization. Objective arrangements are discussed by concerning (1) the conflicting relation between mass and the minimal linear stiffness along z-axis, and (2) the overall stiffness performance. After comparing six multi-objective optimizations, it is found that simultaneously regarding mass and minimal linear stiffness along z-axis as objectives is beneficial for obtaining large payload-to-mass ratio. Moreover, having overall stiffness as objectives would lower the values of motion/force transmissibility and payload-to-mass ratio. Finally, optimization model having motion/force transmissibility, total mass and minimal linear stiffness along z-axis as objectives is selected. The optimal payload-to-mass ratio is up to 13.2837. The 5-DoF hybrid robot is machined and assembled. Experiments on the workspace, repeatability and load carrying capacity confirm the performances of the designed robot.","PeriodicalId":49155,"journal":{"name":"Journal of Mechanisms and Robotics-Transactions of the Asme","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2023-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45102049","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1