An improved technique for measuring piston-assembly friction and comparative analysis with numerical simulations: Under motored condition

Fang, Chong; Meng, Xianghui; Xie, Youbai; Wen, Chuang; Liu, Ruichao

doi:10.1016/j.ymssp.2018.06.015

Cited by 34 publications

(15 citation statements)

References 36 publications

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“…Boundary friction for two rail Boundary friction per rail and power stroke. The predicted value is in the range of total friction measured by Fang et al [12]. Such observation indicates that the derived predictive tool is capable of reasonably computing the frictional losses of a piston ring pack in an engine.…”

Section: Complete Piston Ring-pack/linersupporting

confidence: 63%

“…Most of the methods require extensive modifications of the engine. Recently, with minimal engine modification, Fang et al [12] proposed an improved technique, based on wireless telemetry technology, to measure piston ring/liner friction under motored condition. They compared their results with numerical solutions for the piston ring pack, which generated peak friction force between 100 N and 300 N at varying engine speeds.…”

Section: Introductionmentioning

confidence: 99%

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Predictive tool for frictional performance of piston ring-pack/liner conjunction

Tee

Hamdan

Chong

2019

JMES

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Fundamental understanding of piston ring-pack lubrication is essential in reducing engine friction. This is because a substantial portion of engine frictional losses come from piston-ring assembly. Hence, this study investigates the tribological impact of different piston ring profiles towards engine in-cylinder friction. Mathematical models are derived from Reynolds equation by using Reynolds’ boundary conditions to generate the contact pressure distribution along the complete piston ring-pack/liner conjunction. The predicted minimum film thickness is then used to predict the friction generated between the piston ring-pack and the engine cylinder liner. The engine in-cylinder friction is predicted using Greenwood and Williamson’s rough surface contact model. The model considers both the boundary friction and the viscous friction components. These mathematical models are integrated to simulate the total engine in-cylinder friction originating from the studied piston ring-pack for a complete engine cycle. The predicted minimum film thickness and frictional properties from the current models are shown to correlate reasonably with the published data. Hence, the proposed mathematical approach prepares a simplistic platform in predicting frictional losses of piston ring-pack/liner conjunction, allowing for an improved fundamental understanding of the parasitic losses in an internal combustion engine.

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Section: Complete Piston Ring-pack/linersupporting

confidence: 63%

Section: Introductionmentioning

confidence: 99%

Predictive tool for frictional performance of piston ring-pack/liner conjunction

Tee

Hamdan

Chong

2019

JMES

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“…The JFO cavitation boundary condition satisfying the oil conservation in the cavitation boundary is more perfect in theory [36,37]. The calculation efficiency of the Reynolds boundary condition is better, and the accuracy is acceptable in most cases [38][39][40][41]. In the current study, the Reynolds boundary condition was adopted.…”

Section: Mixed Lubrication Model Of Crosshead Slipperguide Friction Pairmentioning

confidence: 99%

Transient tribo-dynamic analysis of crosshead slipper in low-speed marine diesel engines during engine startup

Meng

Dong

et al. 2020

Friction

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A crosshead slipper-guide system, which bears a significant thrust force, is an essential friction pair in low-speed marine diesel engines. Owing to the low moving speed of the crosshead slipper during engine startup, it is difficult to form good hydrodynamic lubrication between the crosshead slipper and guide. Therefore, a detailed analysis of the crosshead slipper during engine startup is needed. In this study, a new transient tribo-dynamic model for a crosshead slipper during the engine startup process is presented. The model consists of a mixed lubrication model of the crosshead slipper-guide and dynamic models of the piston assembly, crosshead assembly, connecting rod, and crankshaft. The tribo-dynamic performances of the crosshead slipper during startup and under the rated conditions were simulated and compared. The results show that the tribo-dynamics of the crosshead slipper during the startup process are significantly different from those under the rated conditions. Some measures beneficial for the low friction of a crosshead slipper-guide under the rated conditions may significantly increase the friction loss of the crosshead slipper-guide system during the startup process.

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“…Results show that, compared to the CSE, the FPE do not have obvious advantage in friction characteristics. In order to realize the accurate and real time measurement of the frictional condition of piston, Fang et al [12] come up with an improved measurement technique. Results show that the improved measurement system is accurate and reliable compared with the original one.…”

Section: Introductionmentioning

confidence: 99%

Analysis and Optimization Study of Piston in Diesel Engine Based on ABC-OED-FE Method

Qi¹,

Dong²,

Liu³

et al. 2021

Mathematical Problems in Engineering

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In order to increase the reliability and service life of piston in a heavy-duty diesel engine, the geometric structure of piston was optimized based on its maximum temperature and maximum coupling stress. To begin with, the boundary conditions of thermal and stress fields are calculated, which include the heat produced by the combustion in cylinder, the friction-induced heat, and the heat transferred to cooling system. Then, the finite element model was established to calculate and analyse the temperature and thermal-mechanical coupling stress fields of the piston. By combining this simulation model with orthogonal experimental design methods, computations and analyses were performed to determine how the five geometric parameters (depth of intake and exhaust valve grooves, radius of valve grooves transition, radius of top of valve grooves, height of first piston ring groove, and depth of piston ring groove) influence the two evaluation indicators (maximum temperature and maximum stress of piston). Subsequently, using the proposed ABC-OED- FE (artificial bee colony, orthogonal experiment design, and fitting equations) method, the fitting equations between the geometric parameters and evaluation indicators were determined. Taking the minimum values of two evaluation indicators of piston as optimization objectives, artificial bee colony method was run to determine the values of parameters. At last, the two evaluation indicators of the optimized piston were computed. The results indicate that, after optimization, the maximum temperature of piston decreases to be 16.05 K and the maximum stress decreases to be 13.54 MPa. Both temperature and stress conditions of the optimized piston had been improved, which demonstrates the effectiveness of the optimization and the validity of the algorithm.

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An improved technique for measuring piston-assembly friction and comparative analysis with numerical simulations: Under motored condition

Cited by 34 publications

References 36 publications

Predictive tool for frictional performance of piston ring-pack/liner conjunction

Predictive tool for frictional performance of piston ring-pack/liner conjunction

Transient tribo-dynamic analysis of crosshead slipper in low-speed marine diesel engines during engine startup

Analysis and Optimization Study of Piston in Diesel Engine Based on ABC-OED-FE Method

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