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Amplitude and phase curves of both modes for the amplitude ratios , 20, 15, 12, 10, 6, and 4. The curves with (blue) and (red) are marked by * and #, respectively. The black arrow indicates the direction of decreasing .
(a) Interaction forces during approach for (red curve # in Fig. 1). The frames for both time series are indicated. (b) Time series data in a quasiperiodic regime. A period of 15 oscillations prevails for . (c) Time series obtained in the intermittent regime. Phases of noncontact and repulsive contact occur intermittently. The insets in (b) and (c) show typical force pulses.
FFT spectra at for various amplitude ratios. For the harmonics of the driving frequency and intermodulation products are indicated. Frequencies following the rule are marked by “#” and those according to by “*.”
Mean values and standard deviation (brackets) of amplitude and phase values. Last line: , .
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