An Approach for Stable Time Integration of Dual Craig‐Bampton Reduced Systems

Abstract

The dual Craig-Bampton method, a substructuring method that employs free interface normal modes, rigid body modes and attachment modes, yields reduced systems with negative eigenvalues making a stable time integration impossible. A way to overcome this problem through a subsequent modal reduction of dual Craig-Bampton reduced systems is presented and investigated by a simple numerical example. Furthermore, the beneficial effect of additional static modes in the systems' reduction bases is demonstrated.