Stiffness and Damping Formulations for Jointed Deployable Space Truss Structure

2nd International Conference on Manufacturing Technologies

Xi, A.^1 ; Zhang, W.^1 ; Liu, Gen^1

College of Mechanical Engineering, Beijing University of Technology, Beijing

100124, China^1

关键词: Deployable truss structure;    Dynamic characteristics;    Experimental evaluation;    Frequency transition;    Non-contact conditions;    Space truss structure;    Stiffness and damping;    Vibrating structures;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/398/1/012008/pdf
DOI  :  10.1088/1757-899X/398/1/012008

来源: IOP

【 摘 要 】

In this paper, the dynamic behaviors of a elastic rod connected by a joint with clearance of deployable truss structures are investigated. A one-dimensional cantilever with joint support is examined in the deployable truss structure. These formulations consist of the nonlinear joint dynamic stiffness model and damping models are formulated and the dynamic characteristics of free-vibrating structures are estimated. The natural frequency transitions are investigated by considering the contact and noncontact conditions of the clearances, then the formulation of dynamic stiffness model is obtained. The friction models are mathematically formulated and simplified to make them easy to calculate. The impact damping models are formulated using the linear envelope of the time response and it can be negligible when the speed is small. The dynamic characteristics can be estimated by integrating these models and formulations using the energy loss factors. Experimental evaluations show the dynamic characteristics and demonstrate the validity of the formulations.