基于Bennett机构的环形可展开桁架设计与分析
Design and Analysis of Ring-Shaped Expandable Truss Based on Bennett Mechanism
周凯红 1尹振巍 1黄思敏1
作者信息
- 1. 桂林理工大学机械与控制工程学院,桂林 541006
- 折叠
摘要
针对环形天线桁架在面对大口径卫星天线时存在柔性较大、容易引起卫星天线形变的问题,提出一种基于Bennett机构的环形可展桁架.首先,介绍空间过约束Bennett机构,通过改变Bennett机构的转动副与连杆关系,得到稳定的Bennett机构替代构型;其次,以替代构型为基本单元,构建基本单元之间的过渡机构,实现单元之间的衔接和力矩的传递,从而构建出环形可展桁架;最后,通过结构优化和仿真实验,验证了该桁架的可靠性,并与现有的三种环形桁架进行对比.结果表明,该桁架的比刚度与比模态频率均大于其它三种环形可展天线桁架,具备良好的稳定性.
Abstract
To address the issue of large flexibility and potential deformation of satellite antennas when faced with large-diameter antennas,a ring-expandable truss based on a Bennett mechanism is proposed.Firstly,the overconstrained Bennett mechanism in space is introduced.By changing the relationship between the rotary pair and the linkage of the Bennett mechanism,a stable Bennett mechanism substitution configu-ration is obtained.Then,using the substitution configuration as the basic unit,transitional mechanisms be-tween the basic units are constructed to achieve the connection and torque transmission between the units,thus constructing the ring-expandable truss.Finally,through structural optimization and simulation experi-ments,the reliability of the truss is verified and compared with three existing ring-expandable antenna trus-ses.The results show that the stiffness ratio and modal frequency ratio of the proposed truss are both greater than those of the other three ring-expandable antenna trusses,indicating good stability.
关键词
可展开机构/Bennett机构/比刚度/比模态频率Key words
deployable mechanism/Bennett linkage/specific stiffness/specific modal frequency引用本文复制引用
基金项目
国家自然科学基金面上项目(52075110)
广西自然科学基金重点项目(2022JJD160036)
出版年
2024
NETL
NSTL
维普
万方数据