SAMTECH Group SAMTECH Group Track Vehicles Track Vehicles - - PowerPoint PPT Presentation

SAMTECH, Integrating CAE tow ards Professional Solutions

SAMTECH Group SAMTECH Group Track Vehicles Track Vehicles Applications Applications

August 10, 2004 August 10, 2004

SL/04/SAM/MKG_ppt/30an_a

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SAMTECH software SAMTECH software dedicated to track vehicle dedicated to track vehicle modeling modeling

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Scope of the presentation

From military to civil applications Why is it difficult to model tracks? SAMCEF software range dedicated to track design and analysis Example presentations Developments and conclusions Questions/Answers

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Objectives:

Reduced ground pressure Increased on- and off-road

mobility

Reduced weight Ability to operate in extreme

temperatures

Reduced noise and vibration

levels

Reduced acoustic signature

Leclerc, GIAT INDUSTRIES Marder 1A3, RHEINMETALL SoucyTrack, SOUCY

Military application: Armoured Infantry Fighting Vehicle

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Objectives:

Reduced ground pressure Increased on- and off-road mobility Reduced weight Ability to operate in extreme

temperatures

Reduced noise and vibration levels Reduced acoustic signature

Applications:

Building and removal of obstacles Mine breaching Relief missions and missions in disaster areas Bridging of terrain clefts (mainly rivers)

Mine breaching, GIAT INDUSTRIES Bridging rivers, RHEINMETALL

Military engineering

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Objectives:

Low ground pressure in order not to

damage the road

Maximum surface contact Improved traction Excellent performance on- and off-road

Industrial applications

RHEINMETALL RHEINMETALL

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Objectives:

Moulded rubber tracks allow heavy farm

machinery to operate in all types of soft terrain

Low ground pressure Maximum surface contact Increased traction High drawbar pull Reduced damage to soil High speed for moving to and from work

area

SOUCY

Agricultural applications

SOUCY

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Examples of possible sources of “Non-Linearities” involved in FEM models of tracks:

• Large relative displacements & rotations
• Contact with the ground
• Contact between the track and the wheels
• The effects of pretension in the track must be taken into account
• Gearing systems
• Friction effects
• Hyperelastic material behaviour for moulded rubber tracks

Need of an implicit unconditionally stable time integration scheme:

• Control of time integration error during discontinuities
• Reliable description of shocks due to sudden change of motion

sense

Why is it difficult to analyse numerically tracks ?

Our answer: SAMCEF Mecano!

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The different level of description of multibody models are:

Global design (system description, rigid bodies and super elements) Detailed analysis (non-linear structural models) Hybrid analysis (use the best of each level in a combined model)

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General SAMTECH Product Portfolio

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The Automotive industry also recognizes it is the right strategy

RENAULT and GDTECH France use SAMCEF Mecano to design the Formula 1 Renault engine Daimler Chrysler and BMW use SAMCEF Mecano to simulate pipes (non-linear geometry, composite) in motors PSA uses SAMCEF Mecano to design suspensions ZF uses SAMCEF Mecano to design gear boxes PORSCHE already uses BOSS quattro and is looking for sensitivity analysis in SAMCEF Mecano RHEINMETALL uses SAMCEF Mecano to design …tanks !!

Let’s have a short overview of our EXPERTIZE

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Automotive Applications

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Aeronautical Applications

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Machine Tools Applications

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Modeling Modeling track vehicles with track vehicles with SAMCEF implicit solvers SAMCEF implicit solvers

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SAMCEF Field: First industrial Integrated & Associative CAE modeling environment

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SAMCEF Field: integrated modeling environment

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Various analyses accessible from the same associative environment Model definition completely based on the same geometrical support Easy modifications of meshes Easy switch:

• from linear to non linear analysis
• from rigid to flexible body behavior
• from mechanical to thermal analysis
• from metallic to composite materials behavior
• from multi-body simulation to structure analysis
• …

Advantages of SAMCEF Field

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Rigid and/or flexible and/or Super-Element structural parts

Easy switch from one type of analysis to another

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• Linear Static Analysis

(SAMCEF Asef)

• Modal Analysis (SAMCEF

Dynam)

• Super-Element creation

and restitution (SAMCEF Dynam)

• Integrated environment

with MBS and NL FEA

Linear Analysis

Modal Analysis (SAMCEF Dynam)

SAMCEF Asef & SAMCEF Dynam

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What is SAMCEF Mecano

An implicit solver using modern algorithms for contact (reprofiling, automatic surface smoothing), and resolution (automatic time step, sparse solver…) A solution providing every type

• f

analysis: kinematics, static, dynamic A solution providing every level of models: rigid bodies, rigid/flexible joints, full flexible Finite Element models and the possibility to COMBINE them

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Assembly of simple models into complex ones

Track basic cell Sprocket basic cell Elementary «bricks» assembled in a system

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Elementary «bricks» assembled in a system

Assembly of simple models into complex ones

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Wheel Spring

Assembly of simple models into complex ones

Elementary «bricks» assembled in a system

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Body Obstacle Ground

Assembly of simple models into complex ones

Elementary «bricks» assembled in a system

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Result: complex model

Starting from rolling-high velocity Sudden braking (zero angular velocity at the sprocket) Dynamic response

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Examples of possible analyses

Rigid/global kinematic model of vehicle Semi local model of an “detracking” vehicle Semi local model of “sprocket leap” BUT ALSO detailed local analysis of local stresses in the same circumstance

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Example of tank Example of tank modeling modeling and analysis using SAMCEF and analysis using SAMCEF

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Non-linear dynamic analysis of the tank behavior

Project description: Multi-body model Wheel-soil and wheel-chain contacts Wheels are fixed on arms Track: elements + hinges

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Analysis of the obstacle effect on the wheels

Analysis of the acceleration Non-linear transient analysis of the chain (With courtesy of RHEINMETALL)

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Analysis of the obstacle effect on the wheels

Non-linear dynamic analysis of the wheels With courtesy of RHEINMETALL

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Detracking analysis when meeting an obstacle

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Military Applications

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Upcoming Developments

Introduction of the parts concept in SAMCEF Field

which will allow you to define your own library of parameterized elements

Use of Digital Controllers to model the whole tank,

which will have an influence on the tracks and turrets

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Conclusions

A Rigid Multi-Body model is clearly not sufficient Super-Elements are not always sufficient (inefficient

management of contact conditions between moving flexible bodies)

SAMCEF Mecano proposes an implicit NL Dynamic

solution using NL Finite Element/Contact techniques

SAMCEF Field IS the global and integrated CAD

based solution allowing you to properly model any kind of track A adapter ?

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Thank you for your attention ! We will be very pleased to answer to your questions.