Studying technical condition of the interrotor bearing with the SP180-M vibratory-diagnostic test bench after passing life tests

Аuthors

Semenova A. S.^*, Zubko A. I.^**

Lyulka Experimental Design Bureau, branch of the United Engine Corporation – Ufa Engine Industrial Association, 13, Kasatkina str., Moscow, 129301, Russia

*e-mail: anna.semenova.lulka@gmail.com
**e-mail: zbk2@yandex.ru

Abstract

The presented article deals with the studying of roller bearing after accelerated life test for the resource of 2000 hours.

To analyze the 5АВ1002926Р4 bearing vibration state a cpmprehensive analysis was being performed, including spectral analysis, RMS analysis in low-, medium- and high-frequency ranges, analysis of a pick-factor in low- and high-frequency ranges, and analysis of a “raw” signal of records.

The obtained test results allowed evaluate the bearing technical condition and transfer to further life tests with the test bench at “CIAM named after P.I. Baranov”.

It is well-known, that machines and mechanisms reliability depends essentially on their bearing assemblies working capacity. It is especially important for aviation engines as their bearing assemblies are one of the most responsible units often limiting an engine resource.

A reliable estimate of roller bearings technical condition, applied in gas turbine engines presents a problem at the aircraft building enterprise while both manufacturing and incoming inspection and fault detection. It concerns especially the indecomposable bearings since their technical condition estimation system currently in force is based mainly on the subjective methods such as checks on ease of rotation, or noise. Thus, the instrumental control methods implementation allowing not only estimate, but also forecast the working capacity during the operational process with more fidelity, is of current interest.

One of such instrumental methods is the quality monitoring of bearings vibration characteristics (a method of vibration diagnostics), operating with the specified loadings and frequencies of rotation. For vibrations measuring the vibrational converters, i.e. seismometers or accelerometer are used.

Methods of bearings vibrations measurement at control test benches are defined by the Standards [4, 5, 6]. The bearings condition is defined through the analysis of vibration signals [7].

Currently, various test benches, installations and diagnostics complexes, realizing this technique, have been developed, and being manufactured. One of them is the SP-180M test bench for roller bearings incoming inspection, being produced by LLC “Diamekh”. The test bench is meant for experimental studies for technical condition evaluation of separate bearings by vibration diagnostics method. These are the bearings of the first category (new), and bearings of the second category (being reinstalled), being installed in the engine while assembling.

The roller bearings, depending on the structure specifics of the product, where they are employed (parameters of inertia, stiffness and damping) may generate vibration of various intensity at various frequencies.

The vibration sensors mounting location and their characteristics significantly affects measuring results.

Thus, the SP-180 test bench has the single-type fixing of bearings, and fixed position of vibration sensors

The vibration signal amplitude, generated while interaction of working surfaces and external and internal rings of the bearing will depend on the rotational frequency of the test bench. Thus, its operating frequencies have the specified values.

Keywords:

roller bearings, vibration state, incoming inspection

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