A Simplified Piston Secondary Motion Model Considering the Dynamic and Static Deformation of Piston Skirt and Cylinder Bore in Internal Combustion Engines

2008 ◽  
Author(s):  
Fiona McClure ◽  
Tian Tian
Keyword(s):  
Internal Combustion Engines ◽  
Internal Combustion ◽  
Static Deformation ◽  
Combustion Engines ◽  
Motion Model ◽  
Piston Skirt ◽  
Secondary Motion ◽  
Cylinder Bore

Piston dynamics, lubrication and tribological performance evaluation: A review

2018 ◽  
Vol 21 (5) ◽  
pp. 725-741 ◽  
Author(s):  
Cristiana Delprete ◽  
Abbas Razavykia
Keyword(s):  
Power Loss ◽  
Internal Combustion Engines ◽  
Internal Combustion ◽  
Tribological Performance ◽  
Operating Conditions ◽  
Friction Reduction ◽  
Design Parameters ◽  
Combustion Engines ◽  
Piston Skirt ◽  
Secondary Motion

Mechanical power loss of lubricated and bearing surfaces serves as an attractive domain for study and research in the field of internal combustion engines. Friction reduction at lubricated and bearing surface is one of the most cost-effective ways to reduce gas emission and improve internal combustion engines’ efficiency. This thus motivates automotive industries and researchers to investigate tribological performance of internal combustion engines. Piston secondary motion has prime importance in internal combustion engines and occurs due to unbalanced forces and moments in a plane normal to the wrist pin axis. Consequently, piston executes small translations and rotations within the defined clearance during the piston reciprocating motion. Mechanical friction power loss and lubrication at piston skirt/liner and radiated engine noise are dramatically affected by piston secondary dynamics. The lubrication mechanism, piston secondary motion and tribological performance are affected by piston design parameters (piston/liner clearance, wrist pin offset, skirt profile, etc.), lubricant rheology, oil transport mechanism and operating conditions. Therefore, this review is devoted to summarize the synthesis of main technical aspects, research efforts, conclusions and challenges that must be highlighted regarding piston skirt/liner lubrication and piston dynamics and slap.

Application of Nonlinear Vibration Absorbers to the Control of Piston Secondary Motion in Internal Combustion Engines

2015 ◽  
Author(s):  
Nader Dolatabadi ◽  
Stephanos Theodossiades ◽  
Steve J. Rothberg
Keyword(s):  
Internal Combustion Engines ◽  
Passive Control ◽  
Internal Combustion ◽  
Impact Behavior ◽  
Combustion Engines ◽  
Impulsive Behavior ◽  
Control Approach ◽  
Operation Conditions ◽  
Secondary Motion ◽  
Nonlinear Energy

The impulsive behavior of piston plays a key role in the Noise, Vibration and Harshness (NVH) of internal combustion engines. There have been several studies on the identification and quantification of piston impacting action under various operation conditions. In the current study, the dynamics of piston secondary motion are briefly explored, since this is fundamental to understanding the aggressive oscillations, energy loss and noise generation. Concepts of controlling piston secondary motion (and thus, impacts) are investigated and a new passive control approach is presented based on the nonlinear energy absorption of the highly transient oscillations. The effectiveness of this new method on the improvement of piston impact behavior is discussed, using a preliminary optimization exercise (with respect to engine excitation/speed, damping and stiffness of the nonlinear oscillator) that leads to the conceptual design of a nonlinear energy absorber.

scholarly journals Theoretical Performance Comparison between Inline, Offset and Twin Crankshaft Internal Combustion Engines

2008 ◽  
Vol 3 (1) ◽  
pp. 17
Author(s):  
Taj Elssir Hassan ◽  
Abdelfattah Bilal ◽  
Maisara Mohy Eldin Gasim
Keyword(s):  
Internal Combustion Engines ◽  
Thrust Force ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Performance Comparison ◽  
Combustion Engines ◽  
Engine Efficiency ◽  
Output Torque ◽  
Computational Work ◽  
Cylinder Bore

The twin crankshaft engine is anew configuration of internal combustion engine that introduced to solve the engine liner wear problems, increase the engine efficiency and it has other advantages over conventional engines. In this research, a computational work was carried out to compare the performance of three l engine configurations, namely, the conventional (inline) engine, the offset crankshaft engine and the twin crankshaft engine, of the same cylinder bore, speed, crank arm, piston mass and heat addition. The performance measured was the side thrust force that causes liner wear and the output torque. Results showed that the twin crankshaft engine is superior in terms of torque which means it has larger efficiency than the other configurations.

scholarly journals Study of Break-In Process and its Effects on Piston Skirt Lubrication in Internal Combustion Engines

Lubricants ◽  
2019 ◽  
Vol 7 (11) ◽  
pp. 98 ◽  
Author(s):  
Zhen Meng ◽  
Linfeng Zhang ◽  
Tian Tian
Keyword(s):  
Internal Combustion Engines ◽  
Rapid Change ◽  
System Optimization ◽  
Internal Combustion ◽  
Quantitative Agreement ◽  
Asperity Contact ◽  
Combustion Engines ◽  
Piston Skirt ◽  
Calculation Results ◽  
Realistic Prediction

The piston skirt is one of the main contributors to the total mechanical loss in internal combustion engines. Usually, the skirt friction experiences a rapid change during the break-in period largely due to the wear of the machine marks or roughness against soft coatings. It is thus important to consider the effect of the change of the roughness for a realistic prediction of the piston skirt friction and system optimization. In this work, an existing model of piston skirt lubrication was improved with the consideration of a breaking in process for the most commonly used triangle machine marks. A new set of flow factors in the averaged Reynolds equation were analytically derived for the trapezoid shape formed after wear of the original triangle shape. A new asperity contact model was developed for the trapezoid shape. The calculation results reflect the trend of friction mean effective pressure (FMEP) during break-in in an engine test and showed quantitative agreement under the same amount of wear.

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