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Measured distributed “non-similarity level” as a function of a FUT length with two concurrent vibration events. The PZT 1 at 40.16 km is applied by a triangle wave with 2 V. The PZT 2 at 41.40 km is applied by a triangle wave with (a) 2 V, (b) 3 V (reprinted from Ding et al. [54] with permission of IEEE; copyright (2016)).
