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Observation of resonance modes is the most straightforward way of studyingmechanical oscillations because these modes have maximum response to stimuli.However, a deeper understanding of mechanical motion could be obtained by alsolooking at modal responses at frequencies in between resonances. A common wayto do this is to force a mechanical object into oscillations and study itsoff-resonance behaviour. In this paper, we present visualisation of the modalresponse shapes for a mechanical drum driven off resonance. By using thefrequency modal analysis, we describe these shapes as a superposition ofresonance modes. We find that the spatial distribution of the oscillatingcomponent of the driving force affects the modal weight or participation.Moreover, we are able to infer the asymmetry of the drum by studying thedependence of the resonance modes shapes on the frequency of the driving force.Our results highlight that dynamic responses of any mechanical system aremixtures of their resonance modes with various modal weights, further givingcredence to the universality of this phenomenon.

Observing off-resonance motion of nanomechanical resonators as modal superposition