Online monitoring of oil film thickness of journal bearing in aviation fuel gear pump

Wei, Shijie; Wang, Junru; Cui, Jian; Song, Shanshan; Li, Huacong; Fu, Jiangfeng

doi:10.1016/j.measurement.2022.112050

Cited by 20 publications

(18 citation statements)

References 29 publications

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“…When interference factors significantly impact the measurement results, higher-precision measurement results can Temperature Spring model, resonant model (Jia et al, 2021;Jia et al, 2022) Multifaceted temperature compensation for density, sound velocity and reference signal Resonant model (Wei and Wang et al, 2022) Calibration in the temperature range of 24-90°C with 0.2 °C intervals…”

Section: Discussionmentioning

confidence: 99%

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A comprehensive review of non-destructive methods for bearing lubricating oil film thickness measurement

Shang,

Sun,

Cai

2024

ILT

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Purpose The purpose of this study is to investigate the application of non-destructive testing methods in measuring bearing oil film thickness to ensure that bearings are in a normal lubrication state. The oil film thickness is a crucial parameter reflecting the lubrication status of bearings, directly influencing the operational state of bearing transmission systems. However, it is challenging to accurately measure the oil film thickness under traditional disassembly conditions due to factors such as bearing structure and working conditions. Therefore, there is an urgent need for a nondestructive testing method to measure the oil film thickness and its status. Design/methodology/approach This paper introduces methods for optically, electrically and acoustically measuring the oil film thickness and status of bearings. It discusses the adaptability and measurement accuracy of different bearing oil film measurement methods and the impact of varying measurement conditions on accuracy. In addition, it compares the application scenarios of other techniques and the influence of the environment on detection results. Findings Ultrasonic measurement stands out due to its widespread adaptability, making it suitable for oil film thickness detection in various states and monitoring continuous changes in oil film thickness. Different methods can be selected depending on the measurement environment to compensate for measurement accuracy and enhance detection effectiveness. Originality/value This paper reviews the basic principles and latest applications of optical, electrical and acoustic measurement of oil film thickness and status. It analyzes applicable measurement methods for oil film under different conditions. It discusses the future trends of detection methods, providing possible solutions for bearing oil film thickness detection in complex engineering environments.

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Section: Discussionmentioning

confidence: 99%

“…Sliding Bearings (Wei et al, 2022) Uses complex modal and resonance modes for online monitoring of the oil film the presence of incident angles. The accuracy and applicable models of oil film thickness measurement results under different influencing factors shown in Table 4.…”

Section: Resonance Modelmentioning

confidence: 99%

A comprehensive review of non-destructive methods for bearing lubricating oil film thickness measurement

Shang,

Sun,

Cai

2024

ILT

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“…Due to its simple structure, small size, and low sensitivity to oil contamination, gear pumps are widely used in lubrication systems and fuel systems of aviation aircraft [1] . As the power source of the lubrication system, gear pumps provide lubricant and coolant that effectively reduce part wear and carry away heat generated by gears and bearings during transmission, which can ensure aircraft flight safety.…”

Section: Introductionmentioning

confidence: 99%

“…With the continuous improvement of aircraft performance, more stringent requirements have been placed on overall weight and internal space of aircraft, necessitating the miniaturization and lightweight design of components [2] . There are mainly two ways to achieve miniaturization and lightweight design of aviation gear pumps [3][4] : (1) Increasing speed can reduce pump displacement and achieve miniaturization and lightweight design of gears and other components under rated flow rate; (2) Gear pitch circle diameter, and pump body thickness, overall miniaturization and lightweight design can be realized by reducing shaft diameter. However, as gear pump speed increases and dimensions decrease, problems such as intensified oil entrainment, decreased component strength, and increased wear may occur, which lead to premature damage to the transmission system and engine of aviation aircraft during service [5][6] .…”

Section: Introductionmentioning

confidence: 99%

Design and performance analysis of herringbone groove journal bearings for high-speed gear pump

Hao,

Su,

Yan

et al. 2024

Ninth International Symposium on Sensors, Mechatronics, and Automation System (ISSMAS 2023)

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Gear pumps are widely used in the aviation field due to their advantages of simple structure, small size, and strong pollution resistance. With the improvement of aircraft performance and the limitation of internal space, the development of small and lightweight aviation gear pumps has become an inevitable trend. However, downsizing and lightweight design of gear pumps can lead to problems such as reduced strength of key components and increased wear, resulting in shortened lifespan and premature failure during service. Among all parts, the journal bearing is the most severely worn part of the gear pump. Therefore, the lifespan of the journal bearing determines the overall lifespan of the gear pump. This article designs the journal bearing based on the radial force of the gear pump and creates herringbone groove on the journal bearing. Through analysis and calculation, it is found that the bearing with herringbone groove has a larger oil film carrying capacity and lower temperature rise, which can provide a new method for the design of high-speed and small-sized gear pump bearings.

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“…Thereby, the initial mode may even become the primary mode of the final failure [1]. Therefore, predicting the lifespan of aero engine bearings is crucial for effectively implementing 'on-condition maintenance' of an aero engine [2]. As fault diagnosis theory and equipment testing technology improve in quality, the resulting research findings are being applied to several aspects of mechanical engineering practice [3].…”

Section: Introductionmentioning

confidence: 99%

Research on early fault feature extraction technology of aviation bearing based on noise estimation ITD

Ma,

Li,

Xia

et al. 2023

Meas. Sci. Technol.

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Early fault signals of aviation bearings are often accompanied by strong noise. The intrinsic time-scale decomposition (ITD) method is a widely used technique for signal processing in the adaptive time-frequency domain. However, the ITD method suffers from the problem of mode mixing. To improve the performance of signal decomposition, this study introduced the ensemble noise-reconstructed intrinsic time-scale decomposition (ENITD) method. And a sensitive mode component selection method is proposed to achieve the purpose of improving the precision of fault feature extraction. The ENITD method first estimates and reconstructs the intrinsic noise in the early faint signals. Then, the signal is decomposed several times using ITD, and the overall average of the proper rotation component (PRC) of the threshold criteria is calculated. The results demonstrate that the ENITD method effectively mitigates the mode mixing problem and enhances the accuracy of fault feature extraction. Unlike traditional decomposition methods, estimated noise is used for denoising instead of adding white noise. Also, the estimated noise can add different frequency signals to their corresponding PRCs, which helps to improve the mode mixing problem. This paper verifies the effectiveness of the ENITD method for early fault feature extraction of aviation bearings using both simulated and experimental signals.

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Online monitoring of oil film thickness of journal bearing in aviation fuel gear pump

Cited by 20 publications

References 29 publications

A comprehensive review of non-destructive methods for bearing lubricating oil film thickness measurement

A comprehensive review of non-destructive methods for bearing lubricating oil film thickness measurement

Design and performance analysis of herringbone groove journal bearings for high-speed gear pump

Research on early fault feature extraction technology of aviation bearing based on noise estimation ITD

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