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Predicting mobile machine tool dynamics by experimental dynamic substructuring

: Law, Mohit; Rentzsch, Hendrik; Ihlenfeldt, Steffen


International Journal of Machine Tools and Manufacture 108 (2016), pp.127-134
ISSN: 0890-6955
Journal Article
Fraunhofer IWU ()
dynamics; mobile machine tool; experimental substructuring; frequency response functions

Predicting mobile machine tool dynamics prior to moving the machine to a new part and/or location is essential to guide first-time-right in situ machining solutions. This paper considers such a priori prediction of assembled dynamics under varying base/part/contact characteristics by applying dynamic substructuring procedures. Assembled dynamics are predicted by substructural coupling of the machine's known free-free response with the known response of any base/part measured at location. Since obtaining the machine's free-free response remains non-trivial, we instead extract the machine's dynamics using substructure decoupling procedures. Substructuring is carried out using measured frequency response functions. Methods are tested for robustness, and are experimentally validated.