LOAD CELL TECHNIQUE FOR COUPLING SEPARATE STRUCTURAL SIMULATIONS

摘要

Structural dynamic models of large space structures often must account for significant non-linear effects such as gyroscopic and centrifugal forces, configuration dependent mass and stiffness matrices, and non-linear constitutive relations for control components. Although the linear portions of these models can be represented by a truncated set of modes, the solution of the non-linear system equations must proceed by computer simulation. It is often necessary to couple existing separate dynamic simulations. By introducing a hypothetical load cell at the interface, reactions proportional to the lack of compatibility can be generated. The reactions then act to reduce the incompatibility to acceptable limits. The addition of a load cell has the undesirable side effect of causing extra vibration modes which are localized at the interface region. These modes may adversely affect the cost, stability and fidelity of the simulation. Using a root locus technique, two strategies for reducing the adverse side effects of the load cell are examined. A simulation example which models a rigid interface between two beams shows the feasibility of the load cell technique.