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图7 PSE-TENG的电输出特性

Fig.7 Characterization of electrical output from PSE-TENG. (a) Schematic illustration of automatic cyclic contact test device; (b) Output voltages of PSE-TENG at different working frequencies; (c) Stability and reliability of PSE-TENG at 27 000 cycles with working frequency of 0.5 Hz; (d) Output voltages of PSE-TENG in response to periodic compression with different contact forces applied; (e) Fitting diagram of linear relationship between external force and peak output voltage