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Fig. 8

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Numerical simulation of the asymmetric stopper and symmetric stoppers with 500 Hz, 4 g excitation frequency, 0.6d0 top stoppers: (a) the stoppers in dual-capacitor; (b) symmetry, 0.4d0 bottom stoppers; (c) asymmetry, 0.6d0 bottom stoppers; (d) asymmetry, 0.8d0 bottom stoppers.

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