A Comparison of Adaptive Ultrasound Reflectometry Calibration Methods for Use in Lubrication Films

Hansen, Elias Vagn; Johansen, Per Michael

doi:10.3390/en15093240

Cited by 3 publications

(1 citation statement)

References 25 publications

(85 reference statements)

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“…The lubricant film thickness sensor monitors the real-time thickness of the lubricant film and generates the appropriate commands when the film thickness at the interacting surfaces falls below the prescribed value. There are many different lubricant film thickness sensors available such as eddy current sensors [81]., ultrasound transducers [82][83][84], relative optical interference intensity (ROII) [85] etc. Ultrasound reflectometry is the most common use of ultrasound transducers in lubrication film monitoring.…”

Section: For Planetary and Low-speed Bearingsmentioning

confidence: 99%

A Comparative Review of the Lubrication of Bearings in Wind Turbines and Spacecraft to Address Wind Turbine Bearing Failures

Sathyan¹

2023

Tribol. Ind.

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Wind turbines have improved in terms of reliability over the past ten years, but they still experience crucial and expensive tribological issues that shorten their intended lifespans. Most turbines require significant repairs or complete replacements of the tribo components in the 5-to 7-year range. The pricey gearboxes have high repair rates, which greatly raises the operating costs for wind turbines and the cost of wind energy. Currently, various bearings in the turbine are lubricated by automatic lubrication systems with the necessary oil filters to ensure cleanliness. The commonly used lubrication methods for wind turbine bearings are centralized lubrication, oil-air lubrication, oil mist lubrication, and oil bath lubrication. There are similarities between wind turbines and spacecraft-moving mechanical systems. Most spacecraft are designed to work for decades in a remote environment without periodic maintenance. Spacecraft use efficient lubrication systems for their moving mechanical systems to provide the required lubricant to the bearings for the required life. Depending on the lubrication requirements, proven active and passive lubrication systems are employed in spacecraft. This paper reviews the lubrication issues of the wind turbine in comparison with the spacecraft and proposes a few lubrication systems that are successfully performing in spacecraft, intending to improve the reliability of wind turbine tribo-systems.

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Section: For Planetary and Low-speed Bearingsmentioning

confidence: 99%

A Comparative Review of the Lubrication of Bearings in Wind Turbines and Spacecraft to Address Wind Turbine Bearing Failures

Sathyan¹

2023

Tribol. Ind.

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A Review of Ultrasonic Reflectometry for the Physical Characterization of Lubricated Tribological Contacts: History, Methods, Devices, and Technological Trends

Schirru

Varga

2022

Tribol Lett

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Although “film thickness” and “viscosity” represent two of the most important physical parameters in lubricated tribological contacts, their in situ measurement in tribosystems is still difficult. Sensors based on ultrasonic reflectance are a class of sensing devices that allow the direct measurement of these properties. For tribologists especially, the condition changes of tribosystems are of interest, as they determine the smooth operation, proper lubrication condition or the tribosystems’ change to impending failures. Here, ultrasonic reflectance sensors can provide valuable transient information, as they are capable of measuring the evolution of film thickness and viscosity directly, non-invasive, and in situ, thereby bringing a large benefit over classic commercial condition monitoring sensors such as vibration sensors. This paper reviews the methods of operation of ultrasonic reflectance devices, their historical evolution, limitations, potentials, and outline trends of application for the challenges faced by the tribological community and society.

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In-situ adaptive calibration of incident signal of ultrasonic lubricant film thickness measurements

Wu,

Dou,

Chang

et al. 2025

Mechanical Systems and Signal Processing

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A Comparison of Adaptive Ultrasound Reflectometry Calibration Methods for Use in Lubrication Films

Cited by 3 publications

References 25 publications

A Comparative Review of the Lubrication of Bearings in Wind Turbines and Spacecraft to Address Wind Turbine Bearing Failures

A Comparative Review of the Lubrication of Bearings in Wind Turbines and Spacecraft to Address Wind Turbine Bearing Failures

A Review of Ultrasonic Reflectometry for the Physical Characterization of Lubricated Tribological Contacts: History, Methods, Devices, and Technological Trends

In-situ adaptive calibration of incident signal of ultrasonic lubricant film thickness measurements

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