Design and Analysis of Ring-Shaped Expandable Truss Based on Bennett Mechanism
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.
deployable mechanismBennett linkagespecific stiffnessspecific modal frequency
NETL
NSTL
万方数据
维普
