Modelling, simulating and calculating are not always the direct route to a goal. Undertaking measurements on site which are fit for purpose will ensure many questions can be answered. A clear diagnosis can be quickly reached with a few illuminating facts.
The vibrational spectra were measured at individual locations on this machine tool using the Brüel & Kjaer system. An insight into the first eigenmodes can be obtained by comparing the spectra and variation of the excitation frequency.