Analysis Of Middle Bearing Failure In So-3 Jet Engine Using Tip-Timing

摘要

Failure of the middle bearing in an SO-3 engine was reported. Tip-timing and pick detector analyses were carried out on a compressor rotor blade in the seventh stage above the middle bearing. The experimental analyses concerned both an SO-3 engine with a middle bearing in good working order and an engine with a damaged middle bearing. A numerical analysis of the free vibration of the seventh stage blade was conducted to verify the experimental ones. Proposed in this paper is a method to prevent middle bearing failure.