PSI - Issue 20

G.Yu. Zudov et al. / Procedia Structural Integrity 20 (2019) 300–305

303

G.Yu. Zudov et al. / Structural Integrity Procedia 00 (2019) 000–000

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Fig.1. Dependence of number of failures on average daily temperature

As an example, we will consider the influence of the air temperature on the working capacity of the KAMAZ truck wiring. To estimate the relative number of the electrical wiring failures depending on different types of the climatic air temperatures (the maximum, minimum, average and effective ones), the corresponding interval variation series were calculated. The dependence of the relative number of the failures on the average temperature is approximated by a second-degree polynomial with a determination coefficient of R2=0.98, the dependence on the maximum temperature is approximated by a linear function with R2=0.93. The approximation of the dependence of the relative number of the wiring failures on the minimum temperature by the linear function has the determination coefficient equal to only 0.45, which is significantly lower than the coefficient R2 = 0.87 of the dependence of the number of the wiring failures on the effective temperature. As can be seen from the analysis, the largest determination coefficient has the dependence of the number of the wiring failures on the average temperature, and this temperature can be considered as the determining one of all the climatic factors considered. A graph of the relative number of the failures depending on the average daily temperature is shown in Figure 2.

Figure 2 - Dependence of relative number of wiring failures on average daily climatic temperature