Oil distribution and oil film thickness within the piston ring-liner contact measured by laser-induced fluorescence in a reciprocating model test under starved lubrication conditions

Obert, Petra; Füßer, Hans-Jürgen; Bartel, Dirk

doi:10.1016/j.triboint.2018.07.022

Cited by 21 publications

(9 citation statements)

References 13 publications

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“…However, more direct measurement methods are often required for high-precision or high-load systems [ 13 ]. Many film-thickness measurement methods are available, such as electrical methods [ 14 , 15 , 16 ], optical methods [ 17 , 18 , 19 , 20 ], and ultrasonic methods [ 21 , 22 , 23 ]. Among them, the eddy-current method [ 24 , 25 ] is one of the most applied methods in industrial settings given its good working reliability, high sensitivity, and strong anti-interference ability.…”

Section: Introductionmentioning

confidence: 99%

Film-Thickness Identification Method and Lubrication Characteristic Experiment of Full-Size Water-Lubricated Stern Bearing under Offset Load

Ouyang

Liu

et al. 2022

Sensors

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Water-lubricated stern bearing (WSB) is a vital part of the ship propulsion-shaft system, and it is of great significance to monitor and analyze its lubrication status through film thickness data to improve the equipment operational reliability. In this paper, a full-size, large length-to-diameter ratio WSB experiment is carried out, and multi-sectional journal displacement data are collected under offset load. Accordingly, a bearing film-thickness identification model is established, which can identify the dynamic film thickness data in the circumferential direction of bearing section by limited measurement points. On this basis, the film thickness distribution of the full bearing is obtained by combining finite element (FE) simulation and particle swarm optimization (PSO) algorithm. The effect of different speeds on the distributed lubrication characteristics of WSB under offset load was systematically analyzed based on film thickness data. Results show that the maximum identification error of the bearing film-thickness identification model is less than 7%. The bearing lubrication state changes dynamically as the speed increases, and the hydrodynamic lubrication effect in the middle of the bearing is enhanced. The area of each lubrication sub-region varies nonlinearly. Research results are instructive for further determine the service life of the shaft system.

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Section: Introductionmentioning

confidence: 99%

Film-Thickness Identification Method and Lubrication Characteristic Experiment of Full-Size Water-Lubricated Stern Bearing under Offset Load

Ouyang

Liu

et al. 2022

Sensors

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“…3,19 The measurement of oil film thickness can be summarized as electrical methods (based on capacitance, 20 etc. ), optical 21,22 method and acoustic method (based on ultrasound, etc. ), which is of great help to the estimation of the oil film thickness and the verification of the theoretical model.…”

Section: Introductionmentioning

confidence: 99%

Analysis of circumferential oil film thickness for piston ring in twin-rotor piston engine under differential velocity motion of combined annular cylinder

Yang

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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In this paper, a novel type of twin-rotor piston engine (TRPE) is proposed, and the circumferential oil film thickness for the piston ring in TRPE is analysed. Different from the integrated cylinder of a typical engine, the combined annular cylinder (CAC) of TRPE has unique structural composition and differential velocity motion characteristic, making the tribological performance more complicated. The main purpose of this paper is to reveal and explain the special tribological performance of TRPE, which has never been studied. Firstly, the special structural composition of CAC is introduced and the relative velocity between the piston ring and CAC wall at different circumferential positions of the piston ring is analysed. Then, based on the Greenwood-Trip asperity contact theory, radial and axial quasi-static equilibrium equations of the piston ring are both derived. The circumferential oil film thickness is calculated by solving the equilibrium equations and the two-dimensional average Reynolds equation within a cycle. Results indicate that there are significant differences in circumferential oil film thickness of the piston ring due to the special structure and motion of CAC, and the differences become greater as the output shaft speed increases. A long-time engine reverse towing experiment shows an obvious uneven wear phenomenon of the piston ring and CAC wall, which well validates the simulation results of the circumferential oil film thickness. The research work can be used as the basis of equal-wear design for the piston ring in TRPE with the help of surface texture technology, thereby greatly reducing the wear loss.

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“…In recent years, laser-induced fluorescence method is another frequently used optical method using expensive laser and high-speed camera. [5][6][7] The light generated by a laser source causes the fluorescence dye present in the lubricant to emit light in a longer wavelength. The intensity captured with high-speed camera of the light emitted reflects the film thickness.…”

Section: Introductionmentioning

confidence: 99%

“…However, the optical interference can only be applied to the basic research of lubrication state because one of the friction pairs must be glass with semi‐permeable film, and it is limited by load, speed and other conditions. In recent years, laser‐induced fluorescence method is another frequently used optical method using expensive laser and high‐speed camera 5‐7 . The light generated by a laser source causes the fluorescence dye present in the lubricant to emit light in a longer wavelength.…”

Section: Introductionmentioning

confidence: 99%

Study on lubrication state of cylinder liner‐piston ring based on resistance measurement method

Liu

Chen

Yan

et al. 2020

Lubrication Science

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Real-time measurement of the lubrication state is one of the critical problems in studying the lubrication state and its transformation characteristics. Based on the experimental results, shrinkage resistance principle and Greenwood's contact theory, a mathematical model for cylinder liner-piston ring that can be used to measure the resistance of film thickness ratio is established. On this foundation, the correspondence between the film thickness ratio and the contact resistance for cylinder liner-piston ring was presented and the technical possibility to characterise the real-time lubrication state was provided. An experimental study for determining the lubrication state of cylinder linerpiston ring based on resistance measurement method was conducted on a reciprocating friction and wear tester to verify the applicability of resistance measurement method in cylinder liner-piston ring friction pair. Results show that the contact resistance method is reliable and practicable to determine the lubrication state of cylinder liner-piston ring friction pair.

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Oil distribution and oil film thickness within the piston ring-liner contact measured by laser-induced fluorescence in a reciprocating model test under starved lubrication conditions

Cited by 21 publications

References 13 publications

Film-Thickness Identification Method and Lubrication Characteristic Experiment of Full-Size Water-Lubricated Stern Bearing under Offset Load

Film-Thickness Identification Method and Lubrication Characteristic Experiment of Full-Size Water-Lubricated Stern Bearing under Offset Load

Analysis of circumferential oil film thickness for piston ring in twin-rotor piston engine under differential velocity motion of combined annular cylinder

Study on lubrication state of cylinder liner‐piston ring based on resistance measurement method

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