Download - 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
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3. Collar
2. Fluid
1. Pad
Tribological Contact Pairs
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3. Collar
2. Fluid
1. Pad
Thin Film Flow: Reynolds PDE
๐๐๐ฅ ( ๐ h
3
12๐๐๐๐ ๐ฅ )=๐
2๐๐ ๐ฅ (๐ 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
๐๐ :๐ป๐ฆ๐๐๐๐๐ฆ๐๐๐๐๐ ๐๐๐๐ ๐ ๐ข๐๐
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2. Fluid
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Lubrication Regimes
NO CONTACTCONTACT
DRY WET FULL FILM LUBRICATION
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3. Collar
2. Fluid
1. Pad
Lubrication Regimes
NO CONTACTCONTACT
DRY WET FULL FILM LUBRICATION
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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
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2. Fluid
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HLHydrodynamic
Lubrication model- Reynolds PDE
Computational Models Coupling
๐๐ป๐ทReynolds PDE
(โฆ)
๐
๐
h
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3. Collar
2. Fluid
1. Pad
HLHydrodynamic
Lubrication model- Reynolds PDE
EHLElastoHydrodynamic
Lubrication model- Reynolds PDE- Linear Elastic
Linear Elastic๐ข
๐ธ , ฮฝ+๐ต๐ถ(๐๐ป๐ท ,โฆ)
Computational Models Coupling Degree
๐
๐๐ป๐ทReynolds PDE
(โฆ)
๐
๐
h
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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
๐
๐
๐๐ป๐ทReynolds PDE
(โฆ)
Linear Elastic๐ข
๐ธ , ฮฝ+๐ต๐ถ(๐๐ป๐ท ,โฆ)
๐Heat Balance
๐ ,๐ถ๐ ,ฯ ,๐ผ+๐ต๐ถ (๐๐ป๐ท ,โฆ)
h
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Spring-supported Thrust Bearings
THRUST BEARING
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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
๐๐๐ฅ ( ๐ h
3
12๐๐๐๐ ๐ฅ )=๐
2๐๐ ๐ฅ (๐ h)
gap heightvelocity
densityviscosity
pressure
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3. Collar
2. Fluid
1. Pad
Spring-supported Thrust Bearings
Pressure on the Gap Pad TemperatureFluid Film Thickness
PAD
COLLAR
FLUID
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1. Pad
Stern Tube Seals: Rotary Seals
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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.
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Introduction to Computational Tribology: Contact Pairs Modeling
Xavier BorrasTwente UniversityNovember 2015
The slides are available at my profile page in