An Improved Lubrication Model between Piston Rings and Cylinder Liners with Consideration of Liner Dynamic Deformations

Li, Guoxing; Gu, Fengshou; Wang, Tie; Lü, Xilin; Zhang, Li; Zhang, Chunfeng; Ball, Andrew

doi:10.3390/en10122122

Cited by 10 publications

(6 citation statements)

References 22 publications

(52 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The lubrication system is a crucial system to guarantee the safe and reliable operation of a diesel engine. The poor working conditions of a lubrication system can lead to abnormal wear or even some major safety accidents [23,24], e.g., cylinder score and the journal sticking of a diesel engine. Accordingly, the lubrication system was taken as the research object in our study to simulate the faults and illustrate the proposed engine fault detection approach.…”

Section: Description Of the Engine Test Cellmentioning

confidence: 99%

A Multivariate Statistics-Based Approach for Detecting Diesel Engine Faults with Weak Signatures

Zhang

Wang

et al. 2020

Energies

View full text Add to dashboard Cite

The problem of timely detecting the engine faults that make engine operating parameters exceed their control limits has been well-solved. However, in practice, a fault of a diesel engine can be present with weak signatures, with the parameters fluctuating within their control limits when the fault occurs. The weak signatures of engine faults bring considerable difficulties to the effective condition monitoring of diesel engines. In this paper, a multivariate statistics-based fault detection approach is proposed to monitor engine faults with weak signatures by taking the correlation of various parameters into consideration. This approach firstly uses principal component analysis (PCA) to project the engine observations into a principal component subspace (PCS) and a residual subspace (RS). Two statistics, i.e., Hotelling’s T 2 and Q statistics, are then introduced to detect deviations in the PCS and the RS, respectively. The Hotelling’s T 2 and Q statistics are constructed by taking the correlation of various parameters into consideration, so that faults with weak signatures can be effectively detected via these two statistics. In order to reasonably determine the control limits of the statistics, adaptive kernel density estimation (KDE) is utilized to estimate the probability density functions (PDFs) of Hotelling’s T 2 and Q statistics. The control limits are accordingly derived from the PDFs by giving a desired confidence level. The proposed approach is demonstrated by using a marine diesel engine. Experimental results show that the proposed approach can effectively detect engine faults with weak signatures.

show abstract

Section: Description Of the Engine Test Cellmentioning

confidence: 99%

A Multivariate Statistics-Based Approach for Detecting Diesel Engine Faults with Weak Signatures

Zhang

Wang

et al. 2020

Energies

View full text Add to dashboard Cite

show abstract

“…It is clear that a liner is not ideally circular, and two different conditions of lubrication (i.e., fully flooded and starved) usually coexist in an RLC engine cycle [21][22][23]. This is because liner deformation at assembly and service stages is inevitable [24], and the lubricant supplied to the ring is time-varying and usually insufficient at some points of the engine cycle [25]. Therefore, this study provides a comprehensive mathematical model to analyze the frictional characteristics of a groove textured RLC by considering liner deformation and the coexistence of the two different lubrication conditions in an engine cycle.…”

Section: Of 21mentioning

confidence: 99%

“…According to the principle of flow conservation, a flow balance equation should be satisfied for the front control volume [37]. The flow balance equation is given as: q in_ave − q en_ave = q front_ave (24) By submitting Equations (20)~ (22) into Equation 24, the following expression can be obtained.…”

Section: Lubrication Conditionmentioning

confidence: 99%

Investigation on the Frictional Performance of Surface Textured Ring-Deformed Liner Conjunction in Internal Combustion Engines

et al. 2019

View full text Add to dashboard Cite

In internal combustion engines (ICEs), the frictional performance of ring-liner conjunction (RLC) has drawn special attention because it greatly affects the fuel efficiency of the engines. In recent years, surface texture (i.e., micro dimples or grooves) has emerged as a promising approach to improve the frictional performance of RLC. However, most current studies on surface textured RLC were conducted by assuming that the liner was ideally circular and the lubrication condition was either fully flooded or starved. In this study, to evaluate the frictional characteristics of an RLC with surface texture on the ring, a numerical model of lubrication is presented by considering the liner deformation, as well as the coexistence of the fully flooded and staved lubrication conditions in an engine cycle. On this basis, the frictional properties of a surface textured RLC are analyzed, and the impacts of the liner deformation and temperature on the friction-reducing effect of the surface texture are also evaluated. The results show that the surface texture on the ring can effectively reduce the power dissipation and friction dissipation of an RLC, and the reductions vary with the liner temperature and deformation. Large reductions in the power dissipation and friction dissipation of an RLC are obtained when the liner temperature is low or the liner deformation is small.

show abstract

“…Research has shown that for every 10% increase in engine friction loss, fuel consumption would increase by 3% to 5%, and the engine's effective output power would also decrease accordingly. The irregular deformation of the cylinder bore will lead to an increase in cylinder clearance, which will cause an increase in piston-knocking noise [8,9]. Therefore, rationalizing the design of the cylinder bore pattern, reducing the friction power and the peak knocking kinetic energy of the PRCB system, is of great significance to improving the economy and NVH performance of diesel engines.…”

Section: Introductionmentioning

confidence: 99%

Low-Friction and -Knocking Diesel Engine Cylindrical-Tapered Bore Profile Design

Zhang,

Wang,

Wang

et al. 2024

Energies

View full text Add to dashboard Cite

To reduce the friction loss and the piston-knocking noise from the perspective of the design of the cylinder bore profile, the piston-ring cylinder bore (PRCB) dynamic model of an L6 diesel engine was developed using AVL-Excite-Piston & Rings. Based on the full-scale test method, the effects of bore taper, starting height of tapered profile, and ellipticity on the friction power and knocking energy of the PRCB system were investigated, and the optimization of the design of the bore profile was carried out with the objectives of minimizing the system’s friction power and the peak knocking kinetic energy. The results showed that the taper of the cylinder bore has the greatest influence on the system’s friction power and the peak knocking kinetic energy, followed by the starting height of the conical profile. For the peak knocking kinetic energy of the piston, there was an obvious interaction between the taper and the starting height of the conical profile. When the taper was 35 μm and 45 μm, the peak knocking kinetic energy showed a decreasing and then increasing trend with the increase in the starting height of the profile, and when the taper was 55 μm the peak knocking kinetic energy monotonically was decreased with the increase in the starting height of the conical profile. The optimization results showed that the system’s friction power was decreased by 15.05% and the peak knocking kinetic energy was decreased by 21.41% for a taper degree of 55 μm, a tapered profile starting height of 31 mm, and an ellipticity of 50 μm compared to the initial cylindrical cylinder bore.

show abstract

An Improved Lubrication Model between Piston Rings and Cylinder Liners with Consideration of Liner Dynamic Deformations

Cited by 10 publications

References 22 publications

A Multivariate Statistics-Based Approach for Detecting Diesel Engine Faults with Weak Signatures

A Multivariate Statistics-Based Approach for Detecting Diesel Engine Faults with Weak Signatures

Investigation on the Frictional Performance of Surface Textured Ring-Deformed Liner Conjunction in Internal Combustion Engines

Low-Friction and -Knocking Diesel Engine Cylindrical-Tapered Bore Profile Design

Contact Info

Product

Resources

About