Experimental Study on Rubbing Failure of Tilting Pad Bearing in Heavy Duty Gas Turbine

Abstract

Aiming at the rubbing fault of tilting pad sliding bearing of heavy gas turbine, acoustic emission sensor, eddy current sensor and acceleration sensor are used as measuring means to observe the rubbing phenomenon between tilting pad and journal. The rubbing test is carried out on the gas turbine molded rotor-tilting pad bearing test bench. In the test, the failure phenomenon of tilting pad bearing segment instability is simulated. In the test, the segment will periodically rub against the journal, and the swing frequency of the failed segment is about 0.5 times of the rotation frequency of the journal. The test results show that the rubbing frequency of the faulty segment and journal is also about 0.5 times of the rotating frequency, and the rubbing position is at the edge of segment. According to the intensity of acoustic emission signals at different measuring points, the position of the fault segment can be judged.