computational tribology introduction
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Introduction to Computational Tribology: Contact Pairs Modeling
Xavier BorrasTwente UniversityNovember 2015
The slides are available at my profile page in
3. Collar
2. Fluid
1. Pad
Tribological Contact Pairs
3. Collar
2. Fluid
1. Pad
Thin Film Flow: Reynolds PDE
πππ₯ ( π h
3
12ππππ π₯ )=π
2ππ π₯ (π h)
gap height velocity
density
viscosity
pressure
1. Fluid Cavitation2. Non-Newtonian Fluid3. Density = f(Temp, Pressure)4. Viscosity = f(Temp, Pressure)5. Homogenization Techniques6. Fluid Starvation7. Time dependent
ππ :π»π¦πππππ¦πππππ ππππ π π’ππ
3. Collar
2. Fluid
1. Pad
Lubrication Regimes
NO CONTACTCONTACT
DRY WET FULL FILM LUBRICATION
3. Collar
2. Fluid
1. Pad
Lubrication Regimes
NO CONTACTCONTACT
DRY WET FULL FILM LUBRICATION
3. Collar
2. Fluid
1. Pad
Lubrication Regimes
NO CONTACTCONTACT
DRY WET FULL FILM LUBRICATION
Gap Height
No Contact ModelContact Model
Asperities
Reynolds PDEModified Reynolds+ Homogenization
+ Starvation
No Reynolds
Fluid Film
3. Collar
2. Fluid
1. Pad
HLHydrodynamic
Lubrication model- Reynolds PDE
Computational Models Coupling
ππ»π·Reynolds PDE
(β¦)
π
π
h
3. Collar
2. Fluid
1. Pad
HLHydrodynamic
Lubrication model- Reynolds PDE
EHLElastoHydrodynamic
Lubrication model- Reynolds PDE- Linear Elastic
Linear Elasticπ’
πΈ , Ξ½+π΅πΆ(ππ»π· ,β¦)
Computational Models Coupling Degree
π
ππ»π·Reynolds PDE
(β¦)
π
π
h
3. Collar
2. Fluid
1. Pad
HLHydrodynamic
Lubrication model- Reynolds PDE
EHLElastoHydrodynamic
Lubrication model- Reynolds PDE- Linear Elastic
TEHLThermal
ElastoHydrodynamic Lubrication model- Reynolds PDE- Linear Elastic- Heat Balance
Computational Models Coupling Degree
π
π
ππ»π·Reynolds PDE
(β¦)
Linear Elasticπ’
πΈ , Ξ½+π΅πΆ(ππ»π· ,β¦)
πHeat Balance
π ,πΆπ ,Ο ,πΌ+π΅πΆ (ππ»π· ,β¦)
h
3. Collar
2. Fluid
1. Pad
Spring-supported Thrust Bearings
THRUST BEARING
3. Collar
2. Fluid
1. Pad COLLAR
PAD SUPPORT
SHAFT WEIGHT
Pressure distribution
p Fluid Velocity Field
U
Gap Height h
Spring-supported Thrust Bearings
πππ₯ ( π h
3
12ππππ π₯ )=π
2ππ π₯ (π h)
gap heightvelocity
densityviscosity
pressure
3. Collar
2. Fluid
1. Pad
Spring-supported Thrust Bearings
Pressure on the Gap Pad TemperatureFluid Film Thickness
PAD
COLLAR
FLUID
3. Collar
2. Fluid
1. Pad
Stern Tube Seals: Rotary Seals
3. Collar
2. Fluid
Stern Tube Seals: Rotary Seals
Pgas
Pambient
A) No pressure build-up is expected between rod due to the rod rotation.B) Any axial displacement will easily cause a leakage.C) The negative pressure gradient towards ambient will hamper leakage into the
machine.
Introduction to Computational Tribology: Contact Pairs Modeling
Xavier BorrasTwente UniversityNovember 2015
The slides are available at my profile page in
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