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

SAMTECH Group SAMTECH Group Track Vehicles Track Vehicles Applications Applications August 10, 2004 August 10, 2004 SAMTECH, Integrating CAE tow ards Professional Solutions SL/04/SAM/MKG_ppt/30an_a

SAMTECH software SAMTECH software dedicated to track vehicle dedicated to track vehicle modeling modeling SAMTECH, Integrating CAE tow ards Professional Solutions 15/07/04, Page 2 This document is the property of SAMTECH S.A.

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 SAMTECH, Integrating CAE tow ards Professional Solutions 15/07/04, Page 3 This document is the property of SAMTECH S.A.

Military application: Armoured Infantry Fighting Vehicle Objectives: � Reduced ground pressure � Increased on- and off-road mobility � Reduced weight � Ability to operate in extreme temperatures � Reduced noise and vibration SoucyTrack, SOUCY levels � Reduced acoustic signature Marder 1A3, RHEINMETALL Leclerc, GIAT INDUSTRIES SAMTECH, Integrating CAE tow ards Professional Solutions 15/07/04, Page 4 This document is the property of SAMTECH S.A.

Military engineering Applications: � Building and removal of obstacles � Mine breaching � Relief missions and missions in disaster areas � Bridging of terrain clefts (mainly rivers) Mine breaching, Objectives: GIAT INDUSTRIES � 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 Bridging rivers, RHEINMETALL SAMTECH, Integrating CAE tow ards Professional Solutions 15/07/04, Page 5 This document is the property of SAMTECH S.A.

Industrial applications Objectives : � Low ground pressure in order not to damage the road � Maximum surface contact � Improved traction � Excellent performance on- and off-road RHEINMETALL RHEINMETALL SAMTECH, Integrating CAE tow ards Professional Solutions 15/07/04, Page 6 This document is the property of SAMTECH S.A.

Agricultural applications Objectives: � Moulded rubber tracks allow heavy farm machinery to operate in all types of soft terrain � Low ground pressure � Maximum surface contact SOUCY � Increased traction � High drawbar pull � Reduced damage to soil � High speed for moving to and from work area SOUCY SAMTECH, Integrating CAE tow ards Professional Solutions 15/07/04, Page 7 This document is the property of SAMTECH S.A.

Why is it difficult to analyse numerically tracks ? 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 Our answer: SAMCEF Mecano ! SAMTECH, Integrating CAE tow ards Professional Solutions 15/07/04, Page 8 This document is the property of SAMTECH S.A.

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) SAMTECH, Integrating CAE tow ards Professional Solutions 15/07/04, Page 9 This document is the property of SAMTECH S.A.

General SAMTECH Product Portfolio SAMTECH, Integrating CAE tow ards Professional Solutions 15/07/04, Page 10 This document is the property of SAMTECH S.A.

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 SAMTECH, Integrating CAE tow ards Professional Solutions 15/07/04, Page 11 This document is the property of SAMTECH S.A.

Automotive Applications SAMTECH, Integrating CAE tow ards Professional Solutions 15/07/04, Page 12 This document is the property of SAMTECH S.A.

Aeronautical Applications SAMTECH, Integrating CAE tow ards Professional Solutions 15/07/04, Page 13 This document is the property of SAMTECH S.A.

Machine Tools Applications SAMTECH, Integrating CAE tow ards Professional Solutions 15/07/04, Page 14 This document is the property of SAMTECH S.A.

Modeling track vehicles with track vehicles with Modeling SAMCEF implicit solvers SAMCEF implicit solvers SAMTECH, Integrating CAE tow ards Professional Solutions 15/07/04, Page 15 This document is the property of SAMTECH S.A.

SAMCEF Field: First industrial Integrated & Associative CAE modeling environment SAMTECH, Integrating CAE tow ards Professional Solutions 15/07/04, Page 16 This document is the property of SAMTECH S.A.

SAMCEF Field: integrated modeling environment SAMTECH, Integrating CAE tow ards Professional Solutions 15/07/04, Page 17 This document is the property of SAMTECH S.A.

Advantages of SAMCEF Field � 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 • … SAMTECH, Integrating CAE tow ards Professional Solutions 15/07/04, Page 18 This document is the property of SAMTECH S.A.

Easy switch from one type of analysis to another Rigid and/or flexible and/or Super-Element structural parts SAMTECH, Integrating CAE tow ards Professional Solutions 15/07/04, Page 19 This document is the property of SAMTECH S.A.

SAMCEF Asef & SAMCEF Dynam Linear Analysis � Linear Static Analysis (SAMCEF Asef) � Modal Analysis (SAMCEF Dynam) � Super-Element creation and restitution (SAMCEF Dynam) � Integrated environment with MBS and NL FEA Modal Analysis (SAMCEF Dynam) SAMTECH, Integrating CAE tow ards Professional Solutions 15/07/04, Page 20 This document is the property of SAMTECH S.A.

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 of 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 SAMTECH, Integrating CAE tow ards Professional Solutions 15/07/04, Page 21 This document is the property of SAMTECH S.A.

Assembly of simple models into complex ones Elementary «bricks» assembled in a system Track basic cell Sprocket basic cell SAMTECH, Integrating CAE tow ards Professional Solutions 15/07/04, Page 22 This document is the property of SAMTECH S.A.

Assembly of simple models into complex ones Elementary «bricks» assembled in a system SAMTECH, Integrating CAE tow ards Professional Solutions 15/07/04, Page 23 This document is the property of SAMTECH S.A.

Assembly of simple models into complex ones Elementary «bricks» assembled in a system Spring Wheel SAMTECH, Integrating CAE tow ards Professional Solutions 15/07/04, Page 24 This document is the property of SAMTECH S.A.

Assembly of simple models into complex ones Elementary «bricks» assembled in a system Body Obstacle Ground SAMTECH, Integrating CAE tow ards Professional Solutions 15/07/04, Page 25 This document is the property of SAMTECH S.A.

Result: complex model � Starting from rolling-high velocity � Sudden braking (zero angular velocity at the sprocket) � Dynamic response SAMTECH, Integrating CAE tow ards Professional Solutions 15/07/04, Page 26 This document is the property of SAMTECH S.A.

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 SAMTECH, Integrating CAE tow ards Professional Solutions 15/07/04, Page 27 This document is the property of SAMTECH S.A.

Example of tank modeling modeling Example of tank and analysis using SAMCEF and analysis using SAMCEF SAMTECH, Integrating CAE tow ards Professional Solutions 15/07/04, Page 28 This document is the property of SAMTECH S.A.