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piezoelectric generators operating at a frequency lower than their resonating frequency87- 89. Inspired by the frequency-upscaling EMG and the TENG, an MA-TENG was proposed and fabricated to harvest the low-frequency vibration energy more effectively. In MA- TENG, the single mass m0 in SR-TENG is split into two masses, m1 (55.91 g) and m2 (4.28 g) and an additional spring is introduced to achieve resonance coupling, as illustrated in the right-hand schematic of Figure 8a. Under vertical vibration, as illustrated in Figure 9b, m1 will gain an upward velocity e1,gv0 after impacting with the bottom base, followed by the collision between m1 and m2. The sequential pairwise collision between the bottom base, m1, and m2, is capable of transferring kinetic energy from m1 to m2 and amplifying the velocity of final mass m2 when m1 >> m2. This process is also called velocity amplification and can be described by a set of equations using rigid body mechanics.90, 91 As in SR-TENG, the collision between the bottom base and m1 can be described by v=ev 1 1,g0 (9) As for the collision between m1 and m2, the first equation is given by the conservation of momentum, energy loss during collision is accounted for by the coefficient of restitution e2,0, mv+mv =mv' +mv' 11221122 (10) where vi and vi' are the velocity of mi before and after collision respectively. The kinetic 31PDF Image | HIGH PERFORMANCE TRIBOELECTRIC NANOGENERATOR AND ITS APPLICATIONS
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