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Download #1 AIAA_Active Control of Solar Array Dynamics During Spacecraft Maneuvers
In January, 2016, two papers about the application of RecurDyn to NASA space structures were presented at the AIAA SciTech Conference.(http://www.aiaa-scitech.org/?_ga=1.15552181.240458809.1448730114)
The first paper introduces the case which caused nonlinear Finitie Element Analysis (FEA) software to have convergence problems and the run times to be long. However, RecurDyn could complete the simulation with high fidelity. (Simulation of the tube with RecurDyn was executed in 5 minutes as compared to 6 hours using traditional nonlinear FEA code.)
The second paper introduced the automation process of the above case using customized UI.
The titles and abstracts of these papers are shown below, and reference material can be downloaded
#1 Active Control of Solar Array Dynamics During Spacecraft Maneuvers
Recent NASA mission plans require spacecraft to undergo potentially significant maneuvers (or dynamic loading events) with large solar arrays deployed. Therefore there is an increased need to understand and possibly control the nonlinear dynamics in the spacecraft system during such maneuvers. The development of a nonlinear controller is described. The utility of using a nonlinear controller to reduce forces and motion in a solar array wing during a loading event is demonstrated. The result is dramatic reductions in system forces and motion during a 10 second loading event. A motion curve derived from the simulation with the closed loop controller is used to obtain similar benefits with a simpler motion control approach.
(If you click the image below, you can see the movie.)
#2 Simulation of the Deployment of a Flexible Roll-Up Solar Array Using Multi-Body Dynamics Software
Future missions to the outer planets will require significant power that may be provided by large, 300 kW class, flexible roll-up solar arrays. To support the development of these arrays there is high value in simulating the nonlinear dynamics of stowing, deploying, and performance of large deployable solar array structures, especially with the profound limitations of physical testing. Physical testing of prototypes on earth with gravity can be difficult or impossible. Multi-body dynamics software is an ideal platform for developing simulations modeling deployment of flexible, spacecraft structures. This paper presents a dynamic simulation of the deployment of a roll-up solar array using multi-body dynamics modeling software. Additionally, the paper presents the development of a set of software tools that automate tedious tasks associated with developing models of these structures. The tools will aid in the development of future simulation of structures using roll-up boom technology.
