In this paper, an extended Craig-Bampton method is proposed. Despite the common procedure widely used in structural dynamics to create superelements to be combined by means of joints; here, the joints are included in the reduction procedure. This novelty makes it possible to obtain larger superelements that might be subparts of a mechanism or even the whole mechanism. Starting from the classic Craig-Bampton method, the fixed-interface normal modes and interface constraint modes are redefined including the joints contribution. A new transformation matrix necessary to obtain the reduced stiffness and inertia matrices is presented. Finally, the case study of a deployable mechanism is studied. The results of numerical calculations are compared for validation with ANSYS® results.
CITATION STYLE
Cammarata, A., Sinatra, R., & Maddio, P. D. (2019). An extended Craig-Bampton method for the modal analysis of mechanisms. In Mechanisms and Machine Science (Vol. 73, pp. 3329–3338). Springer Science and Business Media B.V. https://doi.org/10.1007/978-3-030-20131-9_329
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