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. 2021 Oct 23;12(11):1301. doi: 10.3390/mi12111301

Figure 9.

Figure 9

Average power versus frequency with p = 9 m/s2, d = 24 mm, RL = 1000 kΩ: (a) nonlinear system (primary resonance); (b) nonlinear system (1/3 subharmonic resonance).