Kinematics and dynamics analysis of a three-degree-of-freedom parallel manipulator

Kinematics and dynamics analyses were performed for a spatial 3-revolute joint-revolute joint-clylindric pair（3-RRC） parallel manipulator.This 3-RRC parallel manipulator is composed of a moving platform,a base platform,and three revolute joint-revolute joint-column pair chains which connect the moving platform and the base platform.Firstly,kinematics analysis for 3-RRC parallel manipulator was conducted.Next,on the basis of Lagrange formula,a simply-structured dynamic model of 3-RRC parallel manipulator was derived.Finally,through a calculation example,the variation of motorial parameters of this 3-RRC parallel manipulator,equivalent moment of inertia,driving force/torque and energy consumption was discussed.The research findings have important significance for research and engineering projects such as analyzing dynamic features,mechanism optimization design and control of 3-RRC parallel manipulator.     

落地式多绳摩擦式提升机天轮轴瓦自动润滑的探讨

为解决落地式多绳摩擦式提升机天轮轴瓦现有润滑方式可靠性与安全性较低,且占用提升设备正常运转时间的问题,提出利用天轮主轴中心油道输送油脂自动加油的方案。从理论上分析了该自动润滑方式的可行性,对落地式多绳摩擦式提升机天轮装置自动润滑方式的选择具有指导意义。     

基于ANSYS的双梁桥式起重机主梁有限元分析

利用ANSYS有限元分析软件,对10 t×22.5 m双梁桥式起重机的主梁进行瞬态动力学和模态的有限元分析,分析满载小车在主梁上行走时对主梁造成的瞬时冲击,并且得到主梁振动的固有频率和对应振型,为起重机的设计和改造提供依据。