Failure Analysis of a Squirrel Cage Bearing of a Gas Turbine Engine

Biswas, Swati; Kumar, Jivan; Satishkumar, V. N.; Babu, S. N. Narendra

doi:10.1007/978-981-10-7197-3_10

Cited by 5 publications

(7 citation statements)

References 2 publications

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“…They often show wear, abnormal twist curvature, breaks and other faults. In practice, a crack initiates at the ends of the cage bridge, which can lead to the cage being broken [1]. The cage's fracture causes an uneven circumferential arrangement of the rollers inside the bearing.…”

Section: Introductionmentioning

confidence: 99%

“…Ball speed variation is also a factor that influences the cage life of ball bearings, and large loads at the ball-cage point of interaction lead to cage failure [29]. Moreover, some bearing cages run into failure under reverse bending fatigue loading conditions [1]. Therefore, the roller-cage impact force is a vital influencing factor for roller-bearing failure.…”

Section: Introductionmentioning

confidence: 99%

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A novel test rig for the investigation of roller-cage impact of a needle roller bearing

Shi¹,

Liu²

2023

Meas. Sci. Technol.

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The collisions between the roller and cage result in crack initiation and propagation leading to the fracture of the cage bridge. The impact forces applied to the needle roller-bearing cage bridge can change the cage's strain distribution, which is related to the relative speed of the roller and cage. In this work, a needle roller bearing roller-cage impact test rig is built to quantify cage strain and investigate the speed impacts on roller-cage impact forces. On the cage bridge, three crack sizes are machined and put on the needle roller bearing roller-cage impact test rig. The strain is measured by the strain gauge positioned on the cage. The encoder measures the shaft speed. The effects of impact speed and crack size on roller-cage impact force and cage deformation are investigated.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A novel test rig for the investigation of roller-cage impact of a needle roller bearing

Shi¹,

Liu²

2023

Meas. Sci. Technol.

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“…Subsequently, a large number of studies have been devoted to investigating the effect of bearing cage sliding on bearing friction and wear from the perspectives of both experimental analysis and practical demonstration. Among them, both Swati Biswas [1] and Pradeep K. Gupta [2] have conducted detailed research and theoretical calculations on the cage sliding process of ball and roller bearings in the 1990s. It is believed that the sliding process of the cage of the ball and roller bearings can be guided and restricted by both the outer and inner rings of the bearing.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Cage Wear in Rolling Bearing Greased

Xue¹,

Wang²,

Huang

2022

Tribology Online

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In this paper, based on the tribological characteristics of rolling bearing greased, we employ X-ray fluorescence spectrum analysis to study the effect of wear in cage with brass, iron and nylon as the main materials. We are especially interested in revealing the relationship between the wear of cage and the wear of rolling bearing parts. Statistical data results show that cages made of different structures or materials always have a certain degree of wear in the operation of grease lubricated bearings. In addition, the wear of the cage is usually less than that of the bearing rolling parts. Our research also indicates that wear particles from different cage materials impose significantly different influences on bearing and grease. Among those cage materials, the influence of the wear particles from nylon cage is more reflected as the mechanical action of the hard filler in the polymer cage. As a comparison, for the iron cage, since its wear particles have metal activity and catalytic properties, they also play important roles in both accelerating the chemical oxidation process of the grease and damaging the network structure of the grease thickener beside the abrasion.

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“…The power dissipated from rolling element bearings (REBs) is of particular relevance in the design of any future energy and power-related systems. 1,2 To increase fuel and energy efficiencies of the aero-transportation systems and reduce environmental impact, meaning more thrust while burning less fuel and emitting less CO 2 , NO x and noise, 3 a range of advanced technologies have been developed, like open rotor, geared turbofan, and contra-rotating turbofan, in which REBs are critical as essential mechanical transmission components. 4 Considering that aviation is responsible for 12% of CO 2 emissions from all transport sources and more than 69,000 new engines will be delivered in the civil market by 2032 5 – per bearing contributing more than 10 kW to total power loss in an engine – one can see great advantages to better understanding frictional loss mechanisms of high-speed REBs (such that DN >10 6 , where D is the bearing's bore diameter, mm and N is the rotating speed, r/min), not to mention that the amount of heat generated dictates the required quantity of lubricant oil, and then the whole lubrication system.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the drag effect of a rolling element confined in the cavity of a cylindrical roller bearing

Gao

Zhang

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part J:

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In cylindrical roller bearings, the drag effect may be induced by the rolling element translating in a fluid environment of the bearing cavity. In this article, the computational fluid dynamics method and experimental tests are employed to analyse its flow characteristics and pressure distribution. The results indicate that the pressure difference between the windward side and the leeward side of the cylinder is raised in view of it blocking the flow field. Four whirl vortexes are formed in four outlets of two wedge-shaped areas between the front part of the cylindrical surface and adjacent walls for the cylinder of L/ D = 1.5 at Re = 4.5 × 103. Vortex shedding is found in the direction of cylinder axis at Re = 4.5 × 104. The relationship between drag coefficient and Reynolds number is illustrated, obviously higher than that of the two-dimensional cylinder in open space.

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Failure Analysis of a Squirrel Cage Bearing of a Gas Turbine Engine

Cited by 5 publications

References 2 publications

A novel test rig for the investigation of roller-cage impact of a needle roller bearing

A novel test rig for the investigation of roller-cage impact of a needle roller bearing

Analysis of Cage Wear in Rolling Bearing Greased

Investigation on the drag effect of a rolling element confined in the cavity of a cylindrical roller bearing

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