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accurate and convincing evaluation of TENG performance compared to previously used instantaneous power, especially in the case with infrequent or irregular mechanical input. It can serve as a standard for evaluating and comparing TENGs with different structures and operating modes in practical working environment, where the vibration is not periodic as in laboratory simulation. The corresponding analysis based on experimental results demonstrates a performance boost of the MA-TENG up to 10 times, which is further validated by the capacitor charging rate. This work serves as an important progress for the future development and application of TENG, especially for harvesting low-frequency vibration energy as well as the great prospect of blue energy. 2.2.4 Experimental Methods 2.2.4.1 Fabrication of SR-TENG and MA-TENG The bases, the shaft and three masses (m0, m1 and m2) in SR-TENG and MA-TENG were designed using SolidWorks. The detailed dimensions of m1 and m2 are shown in Figure 14. m1 (55.91 g) is made of brass, with a diameter of 1 inch and a height of 0.5 inch; m2 (4.28 g) is made of aluminum (Al), with a diameter of 1 inch and a height of 0.1 inch. m0 (60.87 g) is made by binding together m1 and m2 with a lightweight acrylic rim to achieve a similar total weight (m0 ~ m1 + m2). The long spring attached to m0 and m1 has a length of 0.75 inch and a spring constant of 2.5 lbs./inch; the short spring on m2 has a length of 0.25 inch and a spring constant of 13.5 lbs./inch. The steel shaft has a diameter of 1/8 inch and a length of 3 inch. The PTFE film was pasted onto m0 or m2 with foam tape and the Cu film was attached to the top base using insulating Kapton tape. 42PDF Image | HIGH PERFORMANCE TRIBOELECTRIC NANOGENERATOR AND ITS APPLICATIONS
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