Post on 12-Feb-2017
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
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
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
๐๐ป๐ทReynolds PDE
(โฆ)
๐
๐
h
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
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
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
๐๐๐ฅ ( ๐ h
3
12๐๐๐๐ ๐ฅ )=๐
2๐๐ ๐ฅ (๐ 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