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Zissimos P. Mourelatos,

(Associate Professor)Paras Shah, Prashant Patel;

(Graduate Students)

Simulation of Piston

Secondary Dynamics, Piston – Bore Contact and Piston

Slap

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Motivation Piston slap is an NVH phenomenon that is

a strong customer dissatisfer (unusualengine noise).

Noise is an important contributor toQuality, eliability, and !urability (Q!)

Piston slap is a signifcant contributor tothe total "ngine Noise, specially at coldstart.

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Engine “Piston – ore! "nteraction #oise

Generation Mechanism

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#b$ectives %imulate piston secondary motion

!etermine side thrust &orces due topiston ' cylinder liner contact

educe piston slap ecitation.

Predict engine bloc vibration due toside thrust &orces

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Engine “Piston – ore! "nteraction E$ects

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Engine Piston#oise Sources

Piston %&namic 'orces

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 *heoretical +spects inematics- ran'slider mechanism

Piston secondary motion Piston dynamics model

"ngine piston'bore interaction e/ects

%irt ' liner dynamic interaction &orces

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Piston %&namic ontact

Anal&sis

*timi+ation of Sirt

Pro-le for Minimum ontact Pressure

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+nalysis Piston sirt elastic de&ormation

+sperity contact analysis "ngine bloc vibration

 *hermal de&ormation

Piston'sirt "lastroHydro!ynamic ("H!)lubrication

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Piston em*erature %istri/ution Sirt hermal %eformation(hrust Side)

Piston em*erature %istri/ution

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Schematic0 ran SliderMechanism

Sirt ontact 'orces on hrustside for 1arious learances

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0ncertainty in Piston!esign

1 %ensitivity analysis o& piston design

parameters on piston slap ecitationunder uncertainty