Obstacles to High Fidelity Multibody Dynamics Simulation

This study takes a wide ranging look at issues involved in the dynamic modeling of complex, multibodied orbiting space systems. The nature of the multibody problem is reviewed and capabilities and limitations of two major codes (DISCOS, TREETOPS) are assessed. Problem areas that limit accuracy or contribute to uncertainty in the modeling, simulation process are identified. As a specific case, the significance of including, or of not including, 2nd degree geometric nonlinearity in the elastic displacement field (foreshortening) is evaluated Conclusion and recommendations are made concerning the direction future development should take in order to achieve higher fidelity, more computationally efficient multibody software solutions.