...Ankur Ashtekar; Farshid Sadeghi The objectives of this investigation were to design and construct a high speed turbocharger test rig (TTR) to measure dynamics of angular contact ball bearing rotor system, and to develop a coupled dynamic model for the ball bearing rotor system to corroborate...

...T. C. Gupta; K. Gupta; D. K. Sehgal In this paper, a horizontal flexible rotor supported on two deep groove ball bearings is theoretically investigated for instability and chaos. The system is biperiodically excited. The two sources of excitation are rotating imbalance and self excitation due...

...Peter Gloeckner; Klaus Dullenkopf; Michael Flouros Operating conditions in high speed mainshaft ball bearings applied in new aircraft propulsion systems require enhanced bearing designs and materials. Rotational speeds, loads, demands on higher thrust capability, and reliability have increased...

...Changqing Bai; Hongyan Zhang; Qingyu Xu Ball bearings are important mechanical components in high-speed turbomachinery that is liable for severe vibration and noise due to the inherent nonlinearity of ball bearings. Using experiments and the numerical approach, the nonlinear dynamic behavior...

... coefficients for the ball bearing support and the damped gas-bearing support, a pseudononlinear rotordynamic response to imbalance was performed and compared with the experiments. Magge , N. , 1975 , “ Philosophy, Design, and Evaluation of Soft-Mounted Engine Rotor Systems ,” J. Aircr. 0021-8669...

...G. Chen; C. G. Li; D. Y. Wang In this paper, a new rotor-ball bearings-support-stator coupling system dynamic model with rubbing coupling faults is established for practical aeroengine. In the model, the rubbing fault is modeled, the stator motion is considered, the flexible support and squeeze...

... ball bearings damping elastic constants Navier-Stokes equations rotors Lund ( 1 ) noted that tilting-pad journal bearings (TPJBs) eliminate oil whip instabilities because they direct the load component of each pad through the journal center, if the effects of pad inertia and pivot friction...

... been demonstrated that flexibility of the rings can significantly reduce the fatigue life of the ball bearing. 26 04 2007 10 05 2007 05 03 2008 ball bearings computerised tomography fatigue remaining life assessment A computed tomography (CT) scanner’s main bearing...

... with the damper journal. A wave spring pushes the ring ensuring tight sealing to prevent gas ingestion. The mechanical seal also serves to contain the lubricant within the squeeze film land for extended periods of time and; while in operation, to prevent contamination of the ball bearing cartridge...

... to carry out a survey aiming to reduce power losses in bearing chambers. The test bearing was a 124 mm PCD ball bearing with a split inner ring employing under-race lubrication by two individual jets. The survey was carried out in two parts. In the first part, the investigations were focused on the impact...

... been performed with a 124 mm pitch circle diameter (PCD) ball bearing in a bearing chamber that has been adapted from the RB199 turbofan engine DN ∼ 2 × 10 6 . The operating parameters such as oil flow, oil temperature, sealing air flow, bearing chamber pressure, and shaft speed have been varied...

... by the ASME Headquarters March 12, 2004. Associate Editor: D. Assanis. 20 January 2003 12 March 2004 09 02 2005 engines ball bearings friction lubrication thermal properties heat transfer mechanical contact rotation The study reported here is concerned with friction...