An experimental and signal analysis workflow for detecting cold-induced noise emissions (cold squealing) from porous journal bearings

Eder, Stefan J.; Bianchi, Davide; Neacşu, Ioana Adina; Vorlaufer, Georg

doi:10.1016/j.ymssp.2018.05.047

Cited by 9 publications

(2 citation statements)

References 16 publications

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“…As an additional means of tracking the running-in of the system, four consecutive Stribeck curves [22] are recorded after 1,2,3,4,5,8,11,14,17,20,28,36, and 44 h of mixed lubrication operation, which adds an extra 2.5 h of duration to the entire test procedure. The associated rotational speed profile shown in Fig.…”

Section: Experimental Workflowmentioning

confidence: 99%

“…Previous studies by some of the authors focusing on the hydrodynamic operation regime of PJBs [16] or on special phenomena such as cold-squealing [17] have been carried out on a dedicated porous bearing tribometer (SLPG). However, this device can only test one bearing at a time, and since wear tests usually run for several days, a simple but robust device was needed that can wear down several bearings in parallel, thus ensuring comparable operating conditions.…”

Section: Introductionmentioning

confidence: 99%

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An experimental framework for determining wear in porous journal bearings operated in the mixed lubrication regime

Eder¹,

Ielchici²,

Krenn³

et al. 2018

Preprint

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We present an experimental and analysis workflow to characterize the tribological behavior and the wear resistance of porous journal bearing systems operating at high loads and small rotational speeds. Our approach consists of a laser-instrumented tribometer that allows parallel testing of five bearings, an experimental procedure that is optimized for producing sufficient wear during mixed lubrication operation while maintaining realistic operating conditions, as well as several methods to visualize and quantify bearing wear. The simultaneous testing of five bearings prevents outliers from distorting the results and yields a statistical estimation of the performance variations between nominally equivalent tribosystems. We showcase our approach by analyzing the influence of the bearing material and its porosity on mixed-lubrication friction and wear.

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Section: Experimental Workflowmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An experimental framework for determining wear in porous journal bearings operated in the mixed lubrication regime

Eder¹,

Ielchici²,

Krenn³

et al. 2018

Preprint

View full text Add to dashboard Cite

show abstract

Identification of a Material–Lubricant Pairing and Operating Conditions That Lead to the Failure of Porous Journal Bearing Systems

2020

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In this study, we perform accelerated wear tests with porous journal bearings (PJBs) on a lab test rig, providing statistically reliable results under realistic operational conditions. To this end, a custom-made tribometer consisting of 5 mechanically independent but centrally controlled units was used to test five identical bearings in parallel. The test parameters were tuned to promote enough wear under mixed lubrication by increasing the clearance gap and the radial load, while minimizing the bidirectional rotational speed. A wide range of lubricant and material combinations were evaluated, the vast majority of which performed excellently (i.e., negligible wear and low friction). Only one notable combination of a low-density iron bearing paired with a standard PAO-based lubricant failed when operating at low rotational speeds, exhibiting highly unstable frictional behavior and 10–20 times the typical wear in practical applications. An analysis of Stribeck curves, recorded periodically during the wear tests as a diagnostic tool, proved that this particular combination of materials and parameters failed to run in properly, with deteriorating tribological behavior over time. A direct relation between the total wear and the maximum temperature in the tribocontact during testing helped identify this pairing as the only one operating solely under mixed lubrication (high asperity contact), explaining the excessive wear. Graphical Abstract

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Comprehensive review of tribometer dynamics-Cycle-based data analysis and visualization

et al. 2021

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Tribologists often rely on triboexperiments to investigate factors that affect a tribosystem. The inherent dynamic behavior of the respective tribometer setups and its effect on data interpretation remain often unknown. In this study, a comprehensive analysis of sensor data obtained from lubricated and dry triboexperiments is performed. Data are generated on a pin-on-disc test rig with a silicon nitride ball on a steel disc contact with a rotation frequency of ~3 Hz. High-speed acquisition of sensor data up to 5 kHz is performed to resolve changes in the data within individual cycles. The characteristic frequencies of the system and their temporal evolution are determined via time-frequency analysis, which reveals periodic patterns in the sensor data. Cycle-based data evaluation allows the detection of localized events and changes during an operation and considerably reduces the apparent measurement uncertainty, as compared with an unreduced dataset. The data analysis and visualization routines presented herein may serve as a prototype for further application to tribometer setups.

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An experimental and signal analysis workflow for detecting cold-induced noise emissions (cold squealing) from porous journal bearings

Cited by 9 publications

References 16 publications

An experimental framework for determining wear in porous journal bearings operated in the mixed lubrication regime

An experimental framework for determining wear in porous journal bearings operated in the mixed lubrication regime

Identification of a Material–Lubricant Pairing and Operating Conditions That Lead to the Failure of Porous Journal Bearing Systems

Comprehensive review of tribometer dynamics-Cycle-based data analysis and visualization

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