Numerical Analysis and on-ground experiment of electromagnetic flexible deployment for large spacecraft structure
- Paper number
IAC-20,C2,2,3,x57657
- Author
Dr. Jun Jiang, China, Shanghai Engineering Center for Microsatellites, Chinese Academy of Sciences (CAS)
- Coauthor
Mr. Bo Zhang, China, Shanghai Engineering Center for Microsatellite
- Coauthor
Mr. Ming Guo, China, Shanghai Engineering Center for Microsatellites, Chinese Academy of Sciences (CAS)
- Year
2020
- Abstract
The structure of many previous large spacecraft has been deployed using boom, spring and truss mechanism employing an elastic force. The complicate system leads to some challenges for reliability and lightweight. With the ability of electromagnets to exert a force or torque at a distance without contact, current research proposed an electromagnetic subsystem that leverages the interaction of magnets with an external magnetic field to perform structural functions as well as some of the duties of other traditional large spacecraft subsystems. Several primary benefits of the electromagnetic subsystem can be offered to the aerospace community, such as continuous reversible control, less mass of space spacecraft, dimensionally larger structure stowed in the same launch vehicles, reconfigurability of structures following the initial deployment. Up to now, previous electromagnetic deployment research neglected to integrated investigate the coupling between the structure and electromagnetic force/torque. Actually, the structure of electromagnetic deployable spacecraft contains flexible cable and truss mechanism. The coupling between the flexible structure and electromagnetic force/torque should be investigated during deployment stage, because the high non-linearity not only exist on the structure but also on the electromagnetic field. The decoupling between the structure flexibility and electromagnetic field is closely linked to the control feasibility and precision. In this paper, a dynamic model has been established to study the electromagnetic deployment when the structure flexibility is integrated with electromagnetic filed. The simulation model has two parts, the structure flexibility model and electromagnetic force/torque model. For structure flexibility model, the flexible structure is discretized with a hypothetical displacement field structured based the Rayleigh-Ritz method. For electromagnetic filed, we used finite element method for near-field and middle-field electromagnetic interaction simulations, which has been published. We have associated the structure flexibility with electromagnetic force/torque through geopotential energy, elasticity potential energy, stiffness matrix and corresponding mass matrix. To verify the simulation model, we have constructed an experimental platform consists of two air-bearing electromagnetic subsystems connected with flexible cable and truss mechanism, to measure the displacement, velocity and accelerator of mark points on the electromagnetic subsystems and flexible structure, through the displacement sensors and NDI Kinect survey system. The simulation result shows a good agreement with experimental results, with a deviation below 10%. The objective of the paper is to conduct dynamic simulation study for the actual electromagnetic deployment and to conduct an initial study for the optimization of electromagnetic deployable mechanism.
- Abstract document
- Manuscript document
(absent)