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Subject-specific Finite Element Modelling of the Human shoulder complex Part 1:Model Construction and Quasi-static Abduction Simulation

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Journal of Bionic Engineering 2020年第6期17卷 1224-1238页

作者： Manxu Zheng Zhihui Qian Zhenmin Zou Chris Peach Mohammad Akrami Lei Ren School of Mechanical Aerospace and Civil EngineeringUniversity of ManchesterManchesterM139PLUK Key Laboratory of Sensing Technology and Biomedical Instrument of Guangdong province School of Biomedical EngineeringSun Yat-sen UniversityGuangzhou 510006China Key Laboratory of Bionic Engineering Ministry of EducationJilin UniversityChangchun 130022China shoulder and Elbow Unit The University Hospital of South Manchester NHS Foundation TrustSouthmoor RoadWythenshaweManchester M239LTUK Department of Engineering College of EngineeringMathematicsand Physical SciencesUniversity of ExeterExeter EX44QFUK

Human shoulder joints exhibit stable but highly active characteristics due to a large amount of soft *** Element(FE)modelling plays an important role in enhancing our understanding of the mechanism of shoulder ***,the previous FE shoulder models largely neglected the Three-Dimensional(3D)volume of soft tissues and their sophisticated interactions with the *** study develops a 3D model of the rotator cuff and deltoid muscles and *** also includes cartilage and,for the first time,main ligaments around the joint to provide a better computational representation of the delicate interaction of the soft *** model has potential value for studying the force transfer mechanism and overall joint stability variation caused by 3D pathological changes of rotator cuff *** analysis systems and Magnetic Resonance(MR)scans were used to collect shoulder movement and geometric data from a young healthy subject,*** on MR images,a FE model with detailed representations of the musculoskeletal components was constructed.A multi-body model and the measured motion data were utilised to estimate the loading and boundary ***-static FE analyses simulated four instants of the measured scapular *** determined glenohumeral motion,stress/strain distribution in soft tissues,contact area,and mean/peak contact pressure were found to increase monotonically from 0°to 30°of *** results of muscle forces,bone-on-bone contact force,and superior-inferior movement of the humeral centre during motion were consistent with previous experimental and numerical *** is concluded that the constructed FE shoulder model can accurately estimate the biomechanics in the investigated range of motion and may be further used for the comprehensive study of shoulder musculoskeletal disorders.

关键词： shoulder complex biomechanics finite element glenohumeral joint subject-specific

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Biomimetic shoulder complex Based on 3-PSS/S Spherical Parallel Mechanism

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Chinese Journal of Mechanical Engineering 2015年第1期28卷 29-37页

作者： HOU Yulei HU Xinzhe ZENG Daxing ZHOU Yulin School of Mechanical Engineering Yanshan University

The application of the parallel mechanism is still limited in the humanoid robot fields, and the existing parallel humanoid robot joint has not yet been reflected the characteristics of the parallel mechanism completely, also failed to solve the problem, such as small workspace, effectively. From the structural and functional bionic point of view, a three degrees of freedom（DOFs） spherical parallel mechanism for the shoulder complex of the humanoid robot is presented. According to the structure and kinetic characteristics analysis of the human shoulder complex, 3-PSS/S（P for prismatic pair, S for spherical pair） is chosen as the original configuration for the shouder complex. Using genetic algorithm, the optimization of the 3-PSS/S spherical parallel mechanism is performed, and the orientation workspace of the prototype mechanism is enlarged obviously. Combining the practical structure characteristics of the human shouder complex, an offset output mode, which means the output rod of the mechanism turn to any direction at the point a certain distance from the rotation center of the mechanism, is put forward, which provide possibility for the consistent of the workspace of the mechanism and the actual motion space of the human body shoulder joint. The relationship of the attitude angles between different coordinate system is derived, which establishs the foundation for the motion descriptions under different conditions and control development. The 3-PSS/S spherical parallel mechanism is proposed for the shoulder complex, and the consistence of the workspace of the mechanism and the human shoulder complex is realized by the stuctural parameter optimization and the offset output design.

关键词： shoulder complex biomimetics spherical parallel mechanism

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