Piston Secondary Dynamics Considering Elastohydrodynamic Lubrication

Shah, Paras; Mourelatos, Zissimos P.; Patel, Prashant

doi:10.4271/2007-01-1251

Cited by 12 publications

(7 citation statements)

References 16 publications

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“…The multiple requirements for NVH performance, durability and fuel economy must be accounted for in piston design. The parametric design study in [11,12,13,14] showed that various piston design variables and engine operating parameters have a significant effect on piston friction and noise. In addition some of these parameters, such as nominal cold clearance between the skirt and liner may have a negative effect on friction, noise and scuffing.…”

Section: Piston Designmentioning

confidence: 99%

“…Therefore, an accurate and efficient analytical method must be established as an alternative. An analytical model has been developed in [13,14] and used in this study to simulate piston secondary dynamics and piston-bore contact for an asymmetric half piston model. The piston secondary motion and piston-skirt contact pattern determine the piston NVH characteristics because they affect the skirt-to-bore impact force and therefore, how the piston impact excitation energy is damped, transmitted and eventually radiated from the engine structure as noise.…”

Section: Piston Designmentioning

confidence: 99%

“…Output quantities representing performance metrics such as friction, noise and scuffing are calculated. The interested readers are referred to [11,12,13,14] for further details on the piston dynamics, the solution scheme and the contact algorithm.…”

Section: Figure 1 Forces Acting On the Pistonmentioning

confidence: 99%

“…The single-objective RBDO problem of Equation (14) or (16) can be easily extended to the multi-objective case using a similar formulation to section 4. The following mathematical example demonstrates the implementation of MO-RBDO using the commercially available software ISIGHT [31].…”

Section: Reliability-based Design Optimizationmentioning

confidence: 99%

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Piston Design Using Multi-Objective Reliability-Based Design Optimization

Patel

Shah

Mourelatos

2010

SAE Int. J. Mater. Manuf.

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Piston design is a challenging engineering problem which involves complex physics and requires satisfying multiple performance objectives. Uncertainty in piston operating conditions and variability in piston design variables are inevitable and must be accounted for. The piston assembly can be a major source of engine mechanical friction and cold start noise, if not designed properly. In this paper, an analytical piston model is used in a deterministic and probabilistic (reliability-based) multi-objective design optimization process to obtain an optimal piston design. The model predicts piston performance in terms of scuffing, friction and noise, In order to keep the computational cost low, efficient and accurate metamodels of the piston performance metrics are used. The Pareto set of all optimal solutions is calculated allowing the designer to choose the "best" solution according to trade-offs among the multiple objectives. Our multi-objective optimization method is demonstrated with simple examples and applied in the design of an automotive piston.

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Section: Piston Designmentioning

confidence: 99%

Section: Piston Designmentioning

confidence: 99%

Section: Figure 1 Forces Acting On the Pistonmentioning

confidence: 99%

Section: Reliability-based Design Optimizationmentioning

confidence: 99%

See 2 more Smart Citations

Piston Design Using Multi-Objective Reliability-Based Design Optimization

Patel

Shah

Mourelatos

2010

SAE Int. J. Mater. Manuf.

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“…In the last decade, development of new piston secondary dynamics models and improvement of the numerical efficiency of the current approaches while including the effects of deformations and surface parameters have been a major challenge [12][13][14][15]. In this study, the effects of piston-skirt profile design parameters on piston secondary dynamics and friction losses are investigated in detail, including skirt elastic and thermal deformations, pistonskirt texture, roughness, and lubricant properties.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Piston Skirt Profiles on Secondary Motion and Friction

Gunelsu

Akalin

2014

Journal of Engineering for Gas Turbines and Power

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Piston skirt form deviating from a perfect cylinder is investigated numerically for an improved frictional performance. Three features defining the barrel and oval form of the skirt are compared in the search for lower friction power loss. Radius of cwvature around the bulge of the barrel is changed to obtain a flatter or more-rounded lubricated area with respect to a hot-piston profile as well as the axial location of this bulge. On the other hand, the circumferential variation in the separation between the skirt and cylinder wall is represented by an elliptical piston and the aspect ratio is varied for comparison. These different skirt profiles are used in a developed piston secondary dynamics model solving for the lateral movement of the piston by calculating the hydrodynamic and boundary normal forces acting on the piston together with friction. Finally, an improved skirt profile is suggested to obtain better frictional efficiency.

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Friction and Wear Performance of Double-bump Design of Piston Skirt Main Thrust Side

Yin

Jiajun

et al. 2020

Int.J Automot. Technol.

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Piston Secondary Dynamics Considering Elastohydrodynamic Lubrication

Cited by 12 publications

References 16 publications

Piston Design Using Multi-Objective Reliability-Based Design Optimization

Piston Design Using Multi-Objective Reliability-Based Design Optimization

The Effects of Piston Skirt Profiles on Secondary Motion and Friction

Friction and Wear Performance of Double-bump Design of Piston Skirt Main Thrust Side

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