The MARSIS antenna booms are constructed using lenticular hinges between straight boom segments in a novel design which allows the booms to be extremely lightweight while retaining a high stiffness and well defined structural properties once they are deployed. Lenticular hinges are elegant in form but are complicated to model as they deploy dynamically and require highly specialized nonlinear techniques founded on carefully measured mechanical properties. Results from component level testing were incorporated into a highly specialized ADAMS model which employed an automated damping algorithm to account for the discontinuous boom lengths formed during the deployment. Additional models with more limited capabilities were also developed in both DADS and ABAQUS to verify the ADAMS model computations and to help better define the numerical behavior of the models at the component and system levels. A careful comparison is made between the ADAMS and DADS models in a series of progressive steps in order to verify their numerical results. Different trade studies considered in the model development are outlined to demonstrate a suitable level of model fidelity. Some model sensitivities to various parameters are explored using subscale and full system models. Finally, some full system DADS models are exercised to illustrate the limitations of traditional modeling techniques for variable geometry systems which were overcome in the ADAMS model.
A dynamic simulation & validation capability has been developed for mechanical systems design and analysis at Boeing Huntington Beach in the past decade. The technology has been applied to several high-profile space programs, such as Mission to Mir, and International Space Station (ISS) with great success, and plays an important role in the development of Orbital Express and Delta IV programs. NASA has embraced the approach, and has strongly promoted its application on the ISS and other programs. In this paper, the capability is applied for anomaly simulation and resolution of ISS solar array deployment and both simulation and test results are reported.