The paper presents the results of research on dynamic behaviour optimisation of a complex system: a prototype machine axis comprising a welded bed and an aluminium carriage guided by air bearings and driven by a linear electric motor. The dynamical behaviour was predicted from a theoretical model using finite element method. The theoretical model was then updated so that its modal behaviour, which was experimentally measured, matched the real structural modal behaviour. Afterwards, the machine design was optimised. The objective function for this optimisation was the value of the first natural frequency, which had to be higher than the working frequencies of the machine, e.g. milling machine.
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