Figure 31.

A lumped-element representation of a load giving rise to a coupled resonance. This mechanical circuit implicitly invokes the small-load approximation insofar, as the resonator has been drawn as a plate. It might also have been drawn as two large spheres, coupled to each other by another spring (Figure 1B). Had it been drawn as in Figure 1B, the solution to the full set of dynamical equations would have predicted anticrossing (as for the film resonance, Section 4.5.4). Anticrossing is not further discussed in the following. Coupled resonances caused by particles will usually be too broad to let anticrossing be visible.