期刊文献+
共找到4篇文章
< 1 >
每页显示 20 50 100
Structure Analysis of Locking Mechanism of Gear-Rack Typed Ship-Lift 被引量:6
1
作者 SHI Duanwei WU Qingming ZHANG Zhiqiang 《Wuhan University Journal of Natural Sciences》 EI CAS 2006年第3期631-636,共6页
Contact nonlinear theory was researched. Contact problem was transformed into optimization problem containing Lagrange multiplier, and unsymmetrical stiffness matrix was transformed into symmetrical stiffness matrix. ... Contact nonlinear theory was researched. Contact problem was transformed into optimization problem containing Lagrange multiplier, and unsymmetrical stiffness matrix was transformed into symmetrical stiffness matrix. A finite element analysis (FEA) model defining more than 300 contact pairs for long nut-short screw locking mechanism of a large-scale vertical gear-rack typed ship-lift was built. Using augmented Lagrange method and symmetry algorithm of contact element stiffness, the FEA model was analyzed, and the contact stress of contact interfaces and the von Mises stress of key parts were obtained. The results show that the design of the locking mechanism meets the requirement of engineering, and this method is effective for solving large stole nonlinear contact pairs. 展开更多
关键词 ship-lift locking mechanism FEA augmented Lagrange method ANSYS symmetry algorithm
下载PDF
Design of a Novel Exoskeleton with Passive Magnetic Spring Self-locking and Spine Lateral Balancing
2
作者 Jhon F.Rodríguez-León Betsy D.M.Chaparro-Rico +3 位作者 Daniele Cafolla Francesco Lago Eduardo Castillo-Castañeda Giuseppe Carbone 《Journal of Bionic Engineering》 SCIE EI CSCD 2024年第1期236-255,共20页
This paper proposes a new upper-limb exoskeleton to reduce worker physical strain.The proposed design is based on a novel PRRRP(P-Prismatic;R-Revolute)kinematic chain with 5 passive Degrees of Freedom(DoF).Utilizing a... This paper proposes a new upper-limb exoskeleton to reduce worker physical strain.The proposed design is based on a novel PRRRP(P-Prismatic;R-Revolute)kinematic chain with 5 passive Degrees of Freedom(DoF).Utilizing a magnetic spring,the proposed mechanism includes a specially designed locking mechanism that maintains any desired task posture.The proposed exoskeleton incorporates a balancing mechanism to alleviate discomfort and spinal torsional effects also helping in limb weight relief.This paper reports specific models and simulations to demonstrate the feasibility and effectiveness of the proposed design.An experimental characterization is performed to validate the performance of the mechanism in terms of forces and physical strain during a specific application consisting of ceiling-surface drilling tasks.The obtained results preliminarily validate the engineering feasibility and effectiveness of the proposed exoskeleton in the intended operation task thereby requiring the user to exert significantly less force than when not wearing it. 展开更多
关键词 Assistive mechanism EXOSKELETON locking mechanism Bionic robot
原文传递
A novel stiffness optimization model of space telescopic boom based on locking mechanism
3
作者 Kun XU Xinghan ZHUANG +4 位作者 Zhou SU Qiuhong LIN Shouzhi REN Hang XIAO Xilun DING 《Frontiers of Mechanical Engineering》 SCIE CSCD 2024年第3期41-59,共19页
The deployable telescopic boom,whose mass and stiffness play crucial roles,is extensively used in the design of space-deployable structures.However,the most existing optimal design that neglects the influence of the l... The deployable telescopic boom,whose mass and stiffness play crucial roles,is extensively used in the design of space-deployable structures.However,the most existing optimal design that neglects the influence of the locking mechanisms in boom joints cannot raise the whole stiffness while reducing the boom mass.To tackle this challenge,a novel optimization model,which utilizes the arrangement of the locking mechanisms to achieve synchronous improvement of the stiffness and mass,is proposed.The proposed optimization model incorporates a novel joint stiffness model developed based on an equivalent parallel mechanism that enables the consideration of multiple internal stiffness factors of the locking mechanisms and tubes,resulting in more accurate representations of the joint stiffness behavior.Comparative analysis shows that the proposed stiffness model achieves more than at least 11% improved accuracy compared with existing models.Furthermore,case verification shows that the proposed optimization model can improve stiffness while effectively reducing mass,and it is applied in boom optimization design. 展开更多
关键词 deployable telescopic boom locking mechanism stiffness model clearance error optimization model
原文传递
Domain-Swapping as a Mechanism to Lock the Active Conformation of SARS-CoV Main Protease
4
作者 Nan Zhong1, Shengnan Zhang1, Fei Xue2, Xue Kang1, Changwen Jin1, Zihe Rao2, Zhiyong Lou2, & Bin Xia1 1Beijing Nuclear Magnetic Resonance Center, Peking University, Beijing 100871 2Structural Biology Laboratory, Tsinghua University, Beijing, 100084 《生物物理学报》 CAS CSCD 北大核心 2009年第S1期83-83,共1页
The main protease (Mpro) of SARS-CoV plays an essential role in the extensive proteolytic processing of the viral polyproteins (pp1a and pp1ab), and it is an important target
关键词 SARS Domain-Swapping as a Mechanism to Lock the Active Conformation of SARS-CoV Main Protease
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部