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Hopkinson杆实验技术研讨会

作者： Xia Jinsong~1 Guan Fuling~1 Li Gang~2 (ZhejiangUniversity Hangzhou 310027)~1(Jiaxing College Jiaxing 314001)~2

With the wider applications of membrane structures,the requirements to shape design become more multifarious The force method,which is introduced the concept of surface force density of membrane element,is used to find the form of tensility strcutres This method enables to quickly find the individual form to different force density under the same boundary conditions The optimized reposition balance method for force-finding analysis usually is employed to accurately evaluate the self-balance prestress of tensility structures So a combination of the force method of surface force density with the optimized reposition balance method,facilitates completing whole process of shape design.

关键词： tensility structures surface forve density force method form-finding force-finding analysis optimized reposition balance method

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Damage Identiﬁcation of Truss Structures Based on force method

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Advances in Applied Mathematics and Mechanics 2015年第2期7卷 229-244页

作者： Nam-Il Kim Seunghye Lee Namshik Ahn Jaehong Lee Department of Architectural Engineering Sejong University98 Kunja DongKwangjin KuSeoul 143-747Korea

An computationally efﬁcient damage identiﬁcation technique for the planar and space truss structures is presented based on the force method and the micro ge-netic *** this purpose,the general equilibrium equations and the kinematic relations in which the reaction forces and the displacements at nodes are take into ac-count,respectively,are *** compatibility equations in terms of forces are explicitly presented using the singular value decomposition(SVD)*** governing equations with unknown reaction forces and initial elongations are ***,the micro genetic algorithm(MGA)is used to properly identify the site and ex-tent of multiple damage cases in truss *** order to verify the accuracy and the superiority of the proposed damage detection technique,the numerical solutions are presented for the planar and space truss *** numerical results indicate that the combination of the force method and the MGA can provide a reliable tool to accurately and efﬁciently identify the multiple damages of the truss structures.

关键词： Damage identiﬁcation truss force method micro genetic algorithm

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A Geometrical Approach to Compute Upper Limb Joint Stiffness

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Computer Modeling in Engineering & Sciences 2020年第4期123卷 23-47页

作者： Davide Piovesan Roberto Bortoletto Biomedical Industrial and Systems EngineeringGannon University109 University SquareEriePA16541USA 2221e Ltd. Piazza dell’Artigianato1035031 Abano Terme(PD)Italy

Exoskeletons are designed to control the forces exerted during the physical coupling between the human and the *** the human is an active system,the control of an exoskeleton requires coordinated action between the machine and the load so to obtain a reciprocal *** in the control loop can be modeled as active mechanical loads whose stiffness is continuously *** direct measurement of human stiffness is difficult to obtain in real-time,thus posing a significant limitation to the design of wearable robotics ***(EMG)recordings can provide an indirect estimation of human muscle force and stiffness,but current methods for the acquisition of the signals limit their use and *** work proposes a hybrid method for the estimation of upper limb joint stiffness during reaching movements that combines EMG-driven muscle models and constrained *** these two stages process,we estimated an optimal joints’stiffness bounded in a physiologically sound variability *** information is crucial when designing exoskeletons user interfaces in which the limb stiffness is an integral part of the control ***-to-point human reaching movements were analyzed to reconstruct the joint stiffness of the upper *** accurate 3D model of the arm,encompassing all bones from the hand to the scapula and the majority of the upper limb muscles,was developed to represent the sliding center of rotation of the joints.A well-posed parallel mechanism between the skeleton and the configuration of the tracking markers was ***,the muscles’force and joint stiffness were calculated using a generalized pseudo-inversion of the Jacobian transformation between the muscles and Cartesian *** maximal and minimal forces exertable by the muscles were set as the boundary condition for the generalized pseudo-inverse by means of a state-of-the-art muscle model.

关键词： Stiffness inverse problem force method constrained optimization EMG.

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