Spatial Stiffness Analysis of the Planar Parallel Part for a Hybrid Model Support Mechanism

Applied Sciences

Xiaoyong Wu¹  Jiawei Gu²  Zhijiang Xie² 

[1] School of Mechanical Engineering, Chongqing University of Technology, Chongqing 400054, China;State Key Laboratory of Mechanical Transmissions, Chongqing University, Chongqing 400044, China;

关键词: spatial stiffness;    planar parallel mechanism;    stiffness index;    screw theory;    model support mechanism;    active stiffness;   

DOI  :  10.3390/app10186342

来源: DOAJ

【 摘 要 】

The hybrid aircraft model support mechanism is subjected to six directional forces in the experiment, and high spatial stiffness requirement of the parallel part is the guarantee for the stability of the aircraft model. The purpose of this paper is to obtain a planar parallel part with relatively good spatial stiffness and to explore the influence of components on the stiffness characteristics. We employed screw theory and virtual work principle to establish the spatial stiffness model of two possible parallel parts for the support mechanism. The stiffness characteristics of the two parallel mechanisms were evaluated by a desired trajectory sub-workspace deformation distribution and two novel stiffness indexes. According to deformation distributions of the sub-workspace, the deformation of typeⅠ is smaller than that of type Ⅱ. The proposed indexes indicate that the influence of the hydraulic cylinder range on the stiffness of type Ⅱ is more significant; RVR of ASI is 263.5%, RVR of CSI is 18.1%. These reveal type Ⅰ has better spatial stiffness than type Ⅱ. The reason is that the guideway of typeⅠ provides a part of the ability to resist external forces.

【 授权许可】

Unknown