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The article considers a suitability of mathematical model of stretched rod to determine the relationship of the parameters oscillations of the contact wires and their tension. This model allows you to determine the tension by the frequency oscillations of the contact wire obtained after the passage of the current collector. In this case, the speed of the electric rolling stock will not affect the frequency of the damped oscillations. Thanks to the proposed model, the labor intensity is reduced of determining the tension of wires without interruptions in the movement of trains is reduced and there is an opportunity of operational monitoring of the state of the contact suspension remotely.

In the article the author presents a logical-linguistic model, providing a sufficient depth and completeness of diagnostics with fulfillment of all required testing instructions and standards. Diagnostic features for every required testing were determined in order to build the suggested model. The results of a diagnostic model development were applied and successfully tested on various types of electrical sections