0 0.5 1 1.5 2 2.5 3 3.5 −0.5 0 0.5 1 1.5 2 2.5 3 3.5 0 0.5 1 1.5 2 2.5 3 3.5 −0.5 0 0.5 1 1.5 2 2.5 3 3.5 Mode 1 (MAC=1.0,Δω=−1.6e−7) Mode 2 (MAC=1.0,Δω=−2.3e−6) Fig. 5 Modes 1,2 obtained by the Dual Craig-Bampton method (no interface reduction). 0 0.5 1 1.5 2 2.5 3 3.5 −0.5 0 0.5 1 1.5 2 2.5 3 3.5 0 0.5 1 1.5 2 2.5 3 3.5 −0.5 0 0.5 1 1.5 2 2.5 3 3.5 Mode 30 (MAC=0.75,Δω=−1.2e−2) Mode 30,(MAC=0.79,Δω=−7.6e−4) with interface reduction) Fig. 6 Modes 30 obtained by the Dual Craig-Bampton method (without and with interface reduction). 8 Conclusion and outlook In this paper we have proposed an interface reduction technique for the Dual CraigBampton method. The interface modes describe amplitudes of rigid-body modes and interface forces which can be used to further reduce the Dual Craig-Bampton matrices. The strategy proposed here can be seen as fully dual to the interface reduction of the classical Craig-Bampton using interface modes from the statically reduced problem. Daniel J. Rixen 326
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