Static Multiple-stable-state Analysis of Deployable Structures with Clearance Joints

doi:10.3901/JME.2020.05.072

Abstract

Abstract: Clearances are widely existed in joints of space deployable structures for the needs of assembly and deployment. Because of the existence of clearance joints, after space deployable structures are locked in the deployed state, the position of the deployable structures is not unique under the action of external loads, that is, the static multiple-stable-state phenomenon. In order to reveal the intrinsic mechanism of static multiple-stable-state phenomenon, taking the deployable structure of an umbrella-shaped deployable antenna as an example, the static model of the deployable mechanism with clearance joints is established using the mass-less rod model. The influence of clearance size and friction coefficient on static equilibrium position of deployable structure with clearance joints is analyzed. The numerical results indicate that clearance and friction are the reasons of static multiple-stable-state phenomenon. The larger the clearance size is, and the larger the friction coefficient is, the more static equilibrium positions of deployable structures with clearance are. The influences of clearance and friction on static multiple-stable-state phenomenon differ by position. The phenomenon is also influenced by the collocation of bar lengths. The distribution of static equilibrium position can be effectively controlled by applying appropriate preloading forces.

Key words: space deployable structures, static multiple-stable-state phenomenon, clearance joints, umbrella shaped antenna, mass-less rod model

CLC Number:

TH115

CHEN Congcong, LI Tuanjie, MA Xiaofei. Static Multiple-stable-state Analysis of Deployable Structures with Clearance Joints[J]. Journal of Mechanical Engineering, 2020, 56(5): 72-79.

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