Vibration signature analysis

 Vibration personal unsecured analysis Article

V. Meters. Shabaev, A. S. Kazantsev, M. T. Leontiev, We. V. Garanin, V. A. Karasev ìVibration Diagnostics of Antifriction Bearing Damages Öî

VIBRATION ANALYSIS OF ANTIFRICTION BEARING

DAMAGE DURING INSTALLATION AND ASSEMBLAGE

OF WEIGHTY ROTORS

Sixth is v. M. Shabaev, A. S i9000. Kazantsev (JSC ìGasturboserviceî, Tyumen) M. E. Leontiev, I. V. Garanin (Moscow Aeronautical Institute, Moscow) V. A. Karasev (Central Institute of Aviation Motors (CIAM), Moscow) During set up and assembly of heavy rotors with

antifriction bearings, for example in oversize gas turbine

search engines, there can occur local problems of rollers, races and a cage-carrier because of swashes, impacts, or perhaps overforced unit installation. Damages are available in form of chips, grooves, dings, or shear rupture. Likewise, metal attachment is possible in the damage specific zones. Once a disc is set up, such disorders can not be diagnosed unless disassembly of equipment is performed. During

exploitation, these kinds of defects may cause further damages of bearings, making surgery process harmful. That is why the introduction of diagnostics technologies of these kinds of assembly problems of bearings without disassembling the machine is very much of current interest. Allow us to examine the results of experimental research on diagnosability of injuries in heavy

rotors' bearings by the methods of vibration diagnostics and with the help of accelerometers' signals put on the outer side of case-shaped parts approach from the bearing and below

condition of sluggish rotor spinning.

Subject of Research

All of us investigated roller bearing with the rotor VD of gas

turbine engine DZ-59L2 installed in an assembly-room of a

stock on VM3000 balancing stand (Fig. 1).

Specifications of roller bearing of the rotor VD of gas

turbine engine DZ-59L2

Bearing type............................ 6. 32132 BT2 Range of rollers........................ 24 Diameter of the roller, logistik.................. 20 Period of a tool, mm.................... twenty Operating period of a roller, mm............ 18

Size variant of a roller according to Technical

Requirements, mm.......................... < 0. 002 Weight load of any bearing, kilogram............... 619 Radial clearance after fitting of an inner race,

mm................................... 0. 04…0. 099 Outer race fitting........................ loose Bearing wetness...................... liquid

.

Exterior race from the bearing is situated in a package in kind

of a lining. The lining is fixed by single-sided support on the flat bearing (cradle) of the stand which has the form of 30 logistik

thickness dish. On this dish, accelerometers are placed vertically. To succeed in the way of measuring point a signal has to pass through several connections from the bearing. This is quite a complicated method with a span around zero. 5 millimeter. Main bearing

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frequencies have subsequent values: FTF=0. 45fROT,

BPFI=13. 2fROT, BPFO=10. 8fROT, BSF=4. 95fROT, where FTF

is rotation rate of recurrence of a cage-carrier; BPFI is definitely passing consistency of rollers on the interior race; BPFO is completing frequency of rollers for the outer race; BSF is roller rotation frequency; fROT is disc spinning frequency.

Defects in the bearing

Tests were performed on the same new good

condition bearing. Through this bearing, a new roller was replaced with a damaged a single. Damaged rollers were taken from an exploited bearing. All of them were put on on the sides. These rollers were also on top of that damaged analogously to what

can occur in the process of installation. Images of this kind of

damages and the description in line with the measurement

info before and after testing are presented in Fig. 2 .

Measuring equipment and software

We employed accelerometers of the pursuing types:

KD-41, VK-315, RА-032, and others. For primary treatment

there was utilized vibration products of the " National...

Sources: Repair Factory. Tyumen: JSC " Tyumen Aero Builders”,

2006

Diagnostics. Moscow: Mashinostroenie, 2005. 828 p.

Diagnostics. 2004. Number 6.

ìTesting. Diagnosticsî. Issue 1 . 2010

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