Model reduction for efficient time-integration of spatial flexible multibody models

摘要: A reduction method is proposed for efficient time-integration of compliant mechanism models that undergo large deflections. Of particular importance the modelling this class mechanisms accurate description geometric non-linearities, as stiffness characteristics can change significantly during deflection. finite element-based flexible multibody approach used to describe in terms independent generalized coordinates. The deflections requires a sufficient number elements ensure deformations remain small co-rotational context. Increasing elements, increases, besides degrees freedom, largest eigenfrequency model. This reduces allowable step size explicit time-integrator methods. aims suppress high frequency vibrational modes which are not important desired simulation results, while retaining non-linearities reduced For purpose we add constraint relations between These be linear or non-linear. Both cases investigated paper and implemented fixed an interpolated basis method, respectively. effectiveness two methods demonstrated by straight guidance gravity field undergoes yield results with significant increase computational efficiency.