Vibroacoustic technique for the fault diagnosis in a gear transmission of a military helicopter

This article presents the results of laboratory studies of a two-stage gear transmission regarding the process of intentionally increasing damage of its tooth. Also, this study discusses the construction of a gear transmission of a military helicopter on the basis of basic kinematic results of its vibroacoustic signals. What is important, the article describes the aim of laboratory stand, which was to authenticate the applied algorithms of technical condition evaluation of combat helicopter. Also, the process of deepening the damage to the tooth of the gear transmission was described. It was made with the use of stable ranges of rotational speed of measurements of transmission casing in three mutually perpendicular directions and have been referred to the condition without damage. In the article, diagnostic criteria are also determined for the assessment of technical conditions of military helicopter equipped with a gear transmission.

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