Dynamic Analysis of a Turbocharger Rotor-Bearing System in Transient Operating Regimes

Mutra, Rajasekhara Reddy; Srinivas, J.

doi:10.1007/s40032-020-00591-6

Cited by 8 publications

(3 citation statements)

References 29 publications

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“…The TCR operation fails for such reasons as bearings wear and shaft cracks [27], so the TCR configuration should be sufficiently reliable and resistant to negative impacts. Mutra et al [28] developed a numerical simulation platform to study the influence of the bearing parameters and the load factor on the amount of exhaust gases and the rotor speed. To predict the optimal bearing parameters, a surrogate model was used combined with a trained backpropagation neural network model, which turned out to be more efficient than other models.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…The TCR rotor-bearing system experiences significant thermal loads and should be subject to frequent fault monitoring [28]. The study [28] revealed patterns of rotor failures in startup and stop conditions. The proposed approach allows determining the optimal clearance and type of lubrication depending on temperature changes in the system.…”

Section: Introductionmentioning

confidence: 99%

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Studying the Temperature Characteristics of Oil at the Outlet From the K27-145 Turbocharger Rotor Bearing

Гриценко¹,

Shepelev²,

Kaliyev³

2022

Tribol. Ind.

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Turbocharging is a promising solution for increasing the specific power of motor-and-tractor equipment, which allows increasing power up to 50%. At the same time, a significant growth of speed, load, and temperature modes leads to a significant increase in the number of failures and a decrease in reliability by 2-3 times. Theoretical and experimental studies established that the temperature of the bearing and oil at the turbocharger drain changes under the influence of the inlet oil temperature to the TCR bearing, the TCR rotor shaft speed, and the change in the oil pressure at the input to the TCR bearing. This allows setting the limits of the TCR bearing performance in extreme operating conditions. The installation of an autonomous TCR lubricating and braking device maintains the required reliability level and increases failure-free operation. The hydraulic accumulator installed in the lubrication system of the engine turbocharger regulars lubricates and cools the rotor bearings when the ICE crankshaft speed drops. The incorporation of a braking device reduces the rundown time of the rotor and thereby prevents oil starvation and dry friction of the rotor bearing. The combined use of the hydraulic accumulator and the braking device minimizes the risk of dry friction and accidental failure of the turbocharger. We proved that the braking device of the TCR rotor built into the intake system of an ICE with the calculated design parameters reduces the rotor rundown time by 30-35%. This reduces the dimensions and operating time of the hydraulic accumulator and simultaneously eliminates surges in the compressor section of the TCR and any breakage of its parts. In these conditions, it is relevant to develop independent systems to lubricate the TCR bearings and replenish them using built-in hydraulic accumulators during start-up, significant loads at minimum crankshaft speeds, and engine stalling.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%