Abstract
A deployment analysis and experimental study of a novel modular deployable truss structure for deploying and supporting a 28-m-long satellite synthetic aperture radar antenna is presented. Analysis of kinematics and singularity identified four types of singularity configurations. Singularity decoupling analysis indicates that two singularities can occur in the end phase of deployment and prevent complete deployment. A cubic polynomial deployment control strategy and an eccentric shaft design method are suggested to facilitate smooth deployment of the antenna modular deployable truss structure without encountering singularities. The proposed equivalent dynamic analysis method for forecasting driving force shows that the impact of increasing the number of modules is low for drive mechanism A but high for drive mechanism B. Scale model deployment experiments prove that the presented design scheme and deployment analysis theory are feasible. The proposed research can be applied to other large-scale satellite synthetic aperture radar antennas.
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