using adams to simulate skf bearing applications · • insert bearing(s) at desired marker...

2012-03-16 © SKF Group Slide 1

October 30, 2007 © SKF Group Slide 0

SKF Presenters :

Rajesh Maduri

Presented to :

Benelux Adams User Meeting 2012

Using Adams to simulate SKF Bearing Applications



Contents

1. Introduction to Bearing Calculations

2. Motivation to couple with Adams

3. Using Adams for SKF Bearing Applications

4. Examples

5. Conclusions


Concentrated Contacts in Bearings



Concentrated Contacts in Bearings

Typical Truck Wheel

Load: 5 Ton = 50000 N

Surface: 15x30 cm = 0.045 m²

Pressure: 1 MPa

Pressure of a water column of

100 meters high

Typical Bearing

Load: 5 Ton = 50000 N

Surface: 10 times 2.5x0.02 cm=0.00005m²

Pressure: 1000 MPa

Pressure of a water column of

100 kilometers high


SKF State of the Art Software

General Purpose Mechanical Engineering Software : Commercial Tools Available

SKF platforms for Bearing System Analysis



Motivation to couple with Multi Body Tools

• Increasing use of Multi Body tools by customers

• Realistic representation of Bearing in simulations

• No universal tool solves everything

• Ways to Couple simulations

– Co-simulation

– Bearing Module Plug-In


• General co-simulation applications focus on control-

system applications (hardware in the loop)

• Focus here is on coupling different mechanical system

simulations

• Developed for hydraulic systems, but works well for

mechanical systems as well

• Time delay = wave propagation time : used to decouple

equations

• Unconditionally stable

Co-simulation between Adams and Beast : TLM Modeling



• Special requirements on modeling process (general

interface for force & motion exchange) and 3D

modeling

• TLM Manager controls the co-simulation• Narrow and efficient interface for the tools

• Uses a meta model that defines • which external models are involved

• how are they connected (name of points)

• Start, Stop, Time step and TLM Parameters

Co-simulation between Adams and Beast : TLM Modeling


• Complete Car Model in MSC.ADAMS

• Hub unit in BEAST connects the knuckle with the wheel

Co-simulation MSC.ADAMS - BEAST



A car and SKF hub unit

• Sinusoidal driving • Internal bearing behaviour

• Cage behaviour

• Contact pressure


Co-simulation & Need for Bearing Module Plug-In

• TLM interfaces now for BEAST, Orpheus,

MSC.ADAMS,

and Simulink

• Simulation speed very slow : Few days time

• Need Faster approach

• Bearing Module Plug – In with Orpheus



Bearing Module for MBS Tools : Concept

• Prepare Model file using Orpheus

• Insert Bearing(s) into MBS Tool

• Run Bearing Module from MBS Tool

• General Framework extendable for any tool

Orpheus

MBS Tool (Adams)

Model File

Bearing Module (DLL)

Orpheus

MBS Tool (Adams)

Model File



Bearing Module for MBS Tools : Usage

• Macro simulations in Adams and Bearing Module Plug

in

• Study Impact on Bearings in Orpheus

• Socket connection between Orpheus and Adams

Orpheus

MBS Tool (Adams)

Model File


Bearing Performance in Detail

Orpheus

MBS Tool (Adams)

Model File


Bearing Performance in Detail



Bearing Module for MBS Tools : Plug-In connection

• Insert Bearing(s) at desired Marker Locations in Adams

• Bearing is added as a 6 component G-Force Element (Tool Kit from Chris)

• Server – Client Socket Connection

• Start Bearing Module server : Model File

• Adams sends State (Bearing Displacements (Misalignments), Rotation Speed )

• Bearing Module returns Forces (Moments)

• Quasi static Analysis : each time step

MBS TOOL

Adams Client

Bearing Module

ServerForces

State

Bearing 1

Bearing 2

Bearing 3

Bearing n

MBS TOOL

Adams Client

Bearing Module

ServerForces

State

Bearing 1

Bearing 2

Bearing 3

Bearing n


Bearing Module with Adams : Example 1

MSC Adams Simulation

• Simple Adams shaft model with SKF Bearings at each end

• Axial and Radial forces on the shaft



Orpheus Validation of Adams Model

Bearing Load from Orpheus

Bearing Load from MSC Adams


Bearing Module with Adams : Example 2



Bearing Module with Adams : Example


Bearing Module with Adams : Example



Future Steps and goals

• Gain Knowledge and experience with Bearing Module Plug In

• Experience with different Adams simulation settings

• Activate Friction Model for Energy efficient studies


The Complete Four Sources Model of Friction

M

Mrr

Mls

Mdrag

Mseal

ΦΦΦΦish

ΦΦΦΦrs

ΦΦΦΦbl

Four Sources Additional Effects

Total Friction

rr = rolling resistance

ls = lubrication sliding

Ish = inlet shear heating

rs = replenishment

bl = mix lubrication

M

Mrr

Mls

MdragMdrag

Mseal

ΦΦΦΦishΦΦΦΦish

ΦΦΦΦrs

ΦΦΦΦrs

ΦΦΦΦblΦΦΦΦbl


Total Friction

rr = rolling resistance

ls = lubrication sliding

Ish = inlet shear heating

rs = replenishment

bl = mix lubrication



Lubricant Sliding Resistance


E2 Energy Efficient TRB

LAD Simulation

0

5

10

15

20

25

30

35

0 500 1000 1500 2000

speed (rpm )

torq

ue

(N

m)

Std TRB

E2 TRB

Measured Prediction



Conclusions

1. Importance of Concentrated contacts

2. Co-simulation between Adams and Beast

3. Orpheus Bearing Module Plug-In for Adams

4. Questions ??




The Complete Four Sources Model of Friction

M

Mrr

Mls

Mdrag

Mseal

ΦΦΦΦish

ΦΦΦΦrs

ΦΦΦΦbl


Total Friction

rr = rolling resistancels = lubrication slidingIsh = inlet shear heatingrs = replenishmentbl = mix lubrication


Lubricant Sliding Resistance

Mls

Spinning:

purerolling

R

Flange contact

using adams to simulate skf bearing applications · • insert bearing(s) at desired marker...

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