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Testing of Model 3.2 The experimental setup was designed to evaluate the open circuit voltage output of each DC TENG within model 3.2. One oscilloscope channel was dedicated to each DC TENG, with one probe attached to each output wire. The following MATLAB script was used to collect the data from both oscilloscope channels and display each in a separate figure plotting voltage vs time: clc, clear [signal1, time1] = swave(1); [signal2, time2] = swave(2); The code used here uses the function “swave,” written by John Spinelli (Union College Department of Computer and Electrical Engineering), which creates an independent figure displaying the readout from the screen of the oscilloscope for each channel. The screen range is easily adjustable, and limiting the field of view of the oscilloscope limits the data range while increasing the accuracy of each measurement. Regardless of the time span, the code saves 600 data points at equal time increments. During testing, the DC motor and belt drive assembly were directly wired to an adjustable laboratory power supply, and used to spin the center portion of the assembly (the rotor). A handheld tachometer was used to measure the rotations per minute of the rotor, which were constant at a given power input into the motor. When a steady speed was attained, the MATLAB code was initialized, and data acquired. A nearly identical setup was used to measure an approximation of short circuit current, in which the two output wires of a DC TENG were connected across a low-resistance (R, in Ohms [Ω]) resistor. The resulting voltage difference (V, in volts [V]) would be used to calculate the current (I, in amperes [A]) using Ohms Law, shown in Equation 2. 𝑉=𝐼∗𝑅 2 Forti, 16PDF Image | Triboelectric Turbines: Multi-Rotor Counter-Rotating Wind Turbine Utilizing Direct-Current Triboelectric Nanogenerators
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