Piston dynamic characteristics analyses based on FEM method Part I: Effected by piston skirt parameters

He, Zhenpeng; Xie, Weisong; Zhang, Guichang; Hong, Zhenyu; Zhang, Junhong

doi:10.1016/j.advengsoft.2014.05.003

Cited by 32 publications

(22 citation statements)

References 25 publications

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“…Zhu et al, 7 Wong et al, 8 and Liu et al 9 established a more sophisticated model using the average flow model 10,11 to consider the influences of surface roughness and waviness in the piston skirt-liner system. In recent years, more piston parameters and influencing factors related to the tribo-dynamic behavior of the piston skirt have been investigated, 12–20 such as the piston skirt profile, the elastic deformation of the piston skirt and the liner, the cylinder liner vibration, and the connecting rod’s inertial parameters. Meng and Xie 21 presented a new tribo-dynamic model for the piston skirt-liner system in high-speed four-stroke engines by considering the effects of connecting rod inertia.…”

Section: Introductionmentioning

confidence: 99%

A new comprehensive tribo-dynamic analysis for lubricated translational joints in low-speed two-stroke marine engines

Meng

et al. 2019

International Journal of Engine Research

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In low-speed two-stroke marine engines, the effect of connecting rod inertia is important for the tribo-dynamics of crosshead slipper-guide and piston skirt-liner. However, this has not been considered in previous research. Therefore, a new tribo-dynamic model that considers the connecting rod inertia is presented for the two lubricated translational joints, and the lubricant viscosity–temperature properties are accurately incorporated into the model. The modified extended backward differentiation formulate method is used to solve the nonlinear stiff differential equations effectively. The simulation results show that the effect of connecting rod inertia on the dynamic characteristics of two translational joints is mainly observed during the latter half of the upward stroke. For the crosshead slipper, the amplitude of the transverse velocity is increased by 30% at a crank angle of approximately 300° compared to the early model that ignored the connecting rod inertia. With the increase of the connecting rod mass, the secondary motions of both the crosshead slipper and the piston skirt are increased. Furthermore, a decrease of the connecting rod mass can reduce the friction losses of the engine.

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Section: Introductionmentioning

confidence: 99%

A new comprehensive tribo-dynamic analysis for lubricated translational joints in low-speed two-stroke marine engines

Meng

et al. 2019

International Journal of Engine Research

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“…The results showed that the frictional performance can be improved via optimizing the piston skirt profiles. He et al [19] established a numerical model of coupling lubrication and dynamic motion. The effects of the piston skirt parameters on dynamic performance were investigated, including the offset of piston pin, length of piston skirt, curvature parameter, and ellipticity.…”

Section: Introductionmentioning

confidence: 99%

The Analysis of Secondary Motion and Lubrication Performance of Piston considering the Piston Skirt Profile

Lü

Wang

et al. 2018

Shock and Vibration

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The work performance of piston-cylinder liner system is affected by the lubrication condition and the secondary motion of the piston. Therefore, more and more attention has been paid to the secondary motion and lubrication of the piston. In this paper, the Jakobson-Floberg-Olsson (JFO) boundary condition is employed to describe the rupture and reformation of oil film. The average Reynolds equation of skirt lubrication is solved by the finite difference method (FDM). The secondary motion of pistonconnecting rod system is modeled; the trajectory of the piston is calculated by the Runge-Kutta method. By considering the inertia of the connecting rod, the influence of the longitudinal and horizontal profiles of piston skirt, the offset of the piston pin, and the thermal deformation on the secondary motion and lubrication performance is investigated. The parabolic longitudinal profile, the smaller top radial reduction and ellipticities of the middle-convex piston, and the bigger bottom radial reduction and ellipticities can effectively reduce the secondary displacement and velocity, the skirt thrust, friction, and the friction power loss. The results show that the connecting rod inertia, piston skirt profile, and thermal deformation have important influence on secondary motion and lubrication performance of the piston.

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“…The secondary motion of the piston is nonlinear and requires stiff ordinary differential equations due to the nonlinear force. In this study, the Runge-Kutta 34 was used to solve the piston dynamics motion equations, assuming an initial value problem of ordinary differential equation…”

Section: Numerical Solution Proceduresmentioning

confidence: 99%

Piston dynamics analysis considering skirt-liner dynamic clearance

Tian

Feng

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part D:

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Piston slap force is one of the main sources of mechanical engine noise. To obtain a more accurate determination of the piston slap force and minimize piston slap noise, a new simulation model that considers dynamic clearance of the piston skirt and liner has been established in this study. The skirt-liner dynamic clearance is caused mainly by the elastic deformation and thermal deformation of the piston. Comparing three different models, it was found that the impact of dynamic clearance on the piston slap force is reflected mainly in the medium-high frequency, which is the sensitive frequency of the slap noise. Therefore, it is necessary to consider dynamic clearance in the simulation model. In addition, the mechanisms behind the dynamic clearance effect on fluid lubrication, piston dynamics, and piston slap noise were observed. In particular, three typical structural parameters in piston dynamics (the piston pin offset, piston-liner clearance, and piston skirt profile) were studied. The analyses provide guidance for the design of low-noise engines.

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Piston dynamic characteristics analyses based on FEM method Part I: Effected by piston skirt parameters

Cited by 32 publications

References 25 publications

A new comprehensive tribo-dynamic analysis for lubricated translational joints in low-speed two-stroke marine engines

A new comprehensive tribo-dynamic analysis for lubricated translational joints in low-speed two-stroke marine engines

The Analysis of Secondary Motion and Lubrication Performance of Piston considering the Piston Skirt Profile

Piston dynamics analysis considering skirt-liner dynamic clearance

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