They can provide unique comparative criteria while identifying the occurrence of the electric arc: (a) the peak factor W (1), which expresses the ratio of the maximum value to the root-mean-square value of the spectrum, and (b) the shape factor K (2) calculated as the ratio of root-mean-square value to mean value of the considered spectrum [19].

where [I.sub.MAX] is maximal value of optical spectrum intensity [-] and [I.sub.RMS] is root-mean-square value [-], calculated according to dependence (3).

After utilizing the mode-switching control strategy of the supercapacitor, simulation results of the system recycled energy W, the root-mean-square value of vehicle body acceleration [a.sub.w], the root-mean-square value of suspension dynamic travel [SWS.sub.rms], and the root-mean-square value of tire dynamic load [DTL.sub.rms] are shown in Table 2.

According to Figures 9-11, the root-mean-square values of vehicle body acceleration, suspension dynamic travel, and tire dynamic load fluctuated randomly as the supercapacitor initial terminal voltage increased, but the fluctuations were small and showed no apparent rule.

Root-mean-square value of the electric field strength in the point p([x.sub.p], [y.sub.p]) is calculated by the formula:

* root-mean-square values of the electric field strength are determined near a plain which is perpendicular to the PTL wires' direction in the area of the maximal wires approaching to the earth.

The maximum input

root-mean-square value of the ADC is about 255/6 = 42.5 LSB since the signal follows Gaussian distribution.

In addition, the root-mean-square value of the detected wave increased in accordance with the cut-off cycles, and this tendency became clearer with more termites.

The relationships between the number of termites and the root-mean-square value of the detected wave for experiments 1a and 1b are shown in Figure 5.

Figure 8 shows contours of root-mean-square values of the vertical velocity fluctuations ([v.sub.rms]).

Caption: Figure 8: Contours of root-mean-square values of the vertical velocity fluctuations (0 < [v.sub.rms] < 0.27[U.sub.[infinity]], from blue to red).

average and

root-mean-square values, along with parameters such as power factor and q-factor.