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Out of physics curiousity, can anyone point to any references on induced
vibrations in aircraft (or any other mechanical) structures associated with or caused by parametrically induced induced *subharmonic* or *parametric* oscillations? ["Parametric oscillation" = a phenomena well known in electronics and optics, in which if a structure has natural resonances with resonant frequencies f1 and f2, and the structure is then excited or "pumped" with a periodic force at a "pump" frequency fp = f1 + f2, this can cause coupled oscillations to occur and grow at the "signal" and "idler" frequencies f1 and f2.] |
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