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mechanics. In real devices under forced excitation, e.g. external vibration, the collisions take place over a finite time interval especially when springs are involved, and the sequence of impacts may vary. The velocity gain from a collision may even be smaller than 1 due to the change of impact sequence. For example, if m2 collides with m1 before the latter hits the base and reverses its downward moving direction, the velocity of m2 will decrease instead of being amplified. Also, the bottom base, which is also under vibration, acts as an “active ground” rather than a “still ground”, and its impact with the m0 or m1 may increase or reduce their falling velocity when ei,g > 1 or ei,g < 1 respectively. With all the above being accounted for, at certain frequencies, the event that the velocity gain of the masses from collision is smaller than 1 has higher chance of occurrence, and thus the electrical output may reach a local minimum. 2.2.2 Qualitative Comparison of Electrical Outputs of SR-TENG and MA-TENG The performance of SR-TENG and MA-TENG was studied under ambient vibration ranging from 2.5 Hz to 6.0 Hz. Figure 10a and Figure 10b plots their typical short-circuit current at 3.5 Hz, 4.5 Hz and 6.0 Hz frequency respectively, and the outputs at other frequencies are presented in Figure 11. The results provide a clear qualitative comparison of the electrical outputs of the two devices. At the same ambient vibration frequency, more current peaks were generated from the MA-TENG, whereas the current peaks correspond to the contact between the PTFE film and the top electrode when the m0 or m2 collides with the top base. Figure 10c and Figure 10d plots the typical short-circuit current outputs under ambient vibration of 6.0 Hz over a short time domain of 1 second. It can be observed that the number of peaks from SR-TENG, 6, was exactly the same as the frequency while the number of clearly distinguishable peaks from MA-TENG was at least 33PDF Image | HIGH PERFORMANCE TRIBOELECTRIC NANOGENERATOR AND ITS APPLICATIONS
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