virtual reality masterlecture 2007 - rwth aachen university · präsent_d.ppt © wzl / ipt seite 1...

Präs

ent_

d.p

pt

Seite 1© WZL / IPT

Virtual Reality

What is Virtual Reality?

man made

reality

sense

world

Definition: “Virtual Reality is a high-end user interface that involvesrealtime simulations and interactions through multiple sensorial channels. These sensorial modalities are visual,auditory, tactile, smell, taste, [...]“Burdea,1993

Dipl.-Ing. Indra KusumahProcess TechnologyFraunhofer IPTSteinbachstrasse 17D-52074 Aachen

[email protected]

Präs

ent_

d.p

pt

Seite 2© WZL / IPT

Table of Contents

Source: Fraunhofer IAOwww.vr.iao.fhg.de

Virtual Reality Triangle I3

Virtual Reality in Product Development

Virtual Reality Technology

Virtual Reality Applications

Benefit of Virtual Reality

Präs

ent_

d.p

pt

Seite 3© WZL / IPT

Virtual Reality Triangle

I3

Burdea,1993

human imaginationcreation of a virtual worldproblem solving application

computer graphics simulationcreate a realistic looking worldInteractivitiybeing part of the action on the screen

synthesized world is not staticrespond to user inputsdevice input, gesture,verbalcommands, etc.

Immersion

ImaginationInteraction

Source: Adam Opel AG

Präs

ent_

d.p

pt

Seite 4© WZL / IPT

Table of Contents





Benefit of Virtual RealitySource: Fraunhofer IAOwww.vr.iao.fhg.de

Präs

ent_

d.p

pt

Seite 5© WZL / IPT


CAD

FEM

CAD-Model

FEM-Model

Adding Textures,Adding Sounds

Definition of Groups,Definition of Constraints,Adding of Simulation

DigitalMockup

Real 3D

RealtimeInteraction

Voice ControlForce FeedbackTracking

Distancesbetween Objects

Conversion fromparametric to triangle data,Reduction of triangles,Generation of Level of Details

Optimization

Computer Graphic

RenderingImaging,

CAVE, HMD, Desktop

Stereo ProjectorTracking

Präs

ent_

d.p

pt

Seite 6© WZL / IPT

Digital Mockup of a Tool machine

Digital Mockup of a wafer grinding machine

Präs

ent_

d.p

pt

Seite 7© WZL / IPT

Table of Contents






Präs

ent_

d.p

pt

Seite 8© WZL / IPT


What do you need for an immersive Virtual Environment?

High End Graphic Computer

Stereo-Projection-System

Software and Interfaces

Interaction Devices

Force Feedback Glove CyberGraspSource: Virtual Technologies, Inc.

2 sided CAVESource: Fraunhofer IPT

Software Virtual Design 2Source: vrcom

Präs

ent_

d.p

pt

Seite 9© WZL / IPT

High End Graphic Computer

Option:

SGI ONYX

PC-Cluster

SGI ONYX 3200Source: Silicon Graphics Inc. PC Cluster

Präs

ent_

d.p

pt

Seite 10© WZL / IPT


What makes you see 3D?

Stereo Viewing enables to see real 3D, meaning distances between between objectsTwo images with an average distance of 6.5 cm, which is the average eye distance, are necessary to enable real 3D viewingThe brain superimposes both images to a 3D imageDifferent filter technologies to separate images for left and right eye- passive stereo: using glasses with color or polarisation filter- active stereo: using shutter glasses, LCD-displays

Viewer

Virtual 3D Object

Projector

Screen

2D Object

Shutter GlassesSource: Stereographics

Präs

ent_

d.p

pt



What kind of Stereo-Projection-Systems are available?

Screen projection systems- CAVE (Computer Aided Virtual Environment),- HolobenchHead Mounted DisplaysDesktop graphic workstations

CAVE ReaCTor-LiteSource: Trimension Systems

HolobenchSource: TAN Projektionstechnologie

Head Mounted DisplaySource: Virtual Research Systems, Inc.

Desktop VRSource: Stereographics

Präs

ent_

d.p

pt


Interaction Devices

What kind of interaction is possible?

Tracking System:- electromagnetic, inertia, ultrasonic tracking- measure eye position to render images concerning to point of view, e.g. look under a table or behind something

- measure position of input devices to e.g. select objectsStylus, SpacemouseVoice controlForce Feedback for friction, collision, gravityDevices: PHANToM, Sensing GlovesAccustic

StylusSource: Polhemus

sensor

Select button

Cable for trackinginformation

Stylus and electromagnetic EmitterSource: Polhemus

sensor

stylus

emitter

Power supply

Electromagnetic EmitterSource: Polhemus

Force Feedback RoboterSource: SensAble

Force Feedback Glove CyberGraspSource: Virtual Technologies, Inc.

Präs

ent_

d.p

pt


Table of Contents






Präs

ent_

d.p

pt



Virtual Reality Lab at Fraunhofer IPT

• L-Shaped two sided walk-in stereo projection system• electromagnetic tracking• Silicon Graphics Onyx 3200 with two graphic pipes• several VR software packages

Presently used applications

• Combination of Design Review and Digital Mockup• Assembly simulation of rigid parts

In development

• Virtual Process Engineering • Combination of VR and video conference• Assembly simulation of elastic tubes

page 10

Präs

ent_

d.p

pt


Development &Design

Combination of Design Review & Digital Mockup

page 12

Design Review / DMU Scenario

• virtual menu:

• rotate machine

• display FEM results on virtual monitor

• hide / show machine parts

• animated machine components:

• doors

• tool carriage in x, y and z

• collision checks:

• between tool carriage and plate

• between tool carriage and doors

collision

Präs

ent_

d.p

pt


Combination of Design Review & Digital Mockup (Video)

...

page 13

Präs

ent_

d.p

pt


Development &Design

Assembly Simulation

Assembly Simulation with Virtual Design 2

• mounting of the grinding tool into support

• tolerances: • 5mm• 1mm

• recording of the assembly path

• two options of collision detection• glide able: gliding of part possible • ghost: moving of ghost part after collision

• 155.000 polygons at 7 fps on two pipes with an ONYX 3200

page 14

Präs

ent_

d.p

pt


Assembly Simulation (Video)

page 15

Präs

ent_

d.p

pt


Assembly of elastic tubes (Video)

generation of tube

fixing of tube

cutting of tube

total length

delete tube

Präs

ent_

d.p

pt


Simulation and visualization of manufacturing processes

ManufacturingProcess

Material Parameter

Finite Element Method

Virtual Reality

Präs

ent_

d.p

pt


Steps of a Cutting Simulation

material dataflow curve: s = f(T,e,de/dt)friction: µ = f(T,s,v)density: r = f(T)spec. heat capacity.: cp = f(T)Taylor-Quinney: k = f(e,de/dt)E-Module: E = f(T)therm. expansion: dl = f(T)...process parameterfeed [mm/ U]depth of cut [mm]...

simulation resultscutting forcetemperaturechip geometry

distribution of • stress• strain• strainrate

Numerical Influence• number of

remeshing steps• element type

?

Pre Processor Solver Post Processor

Präs

ent_

d.p

pt


Procedure for Virtual Reality Post Processing

** STEP NUMBER = 10**RZ 1 5663

1 -0.725715E+01 0.263451E+02 -0.187072E+012 -0.143405E+02 0.231648E+02 -0.186192E+013 -0.860995E+01 0.242886E+02 -0.186776E+01...

URZ 1 56631 0.753087E+01 0.982587E+01 -0.414815E+022 0.491817E+01 0.110875E+02 -0.415255E+023 0.683126E+01 0.100244E+02 -0.411097E+02...

NDTMP 1 56631 0.200000E+022 0.200000E+023 0.200000E+02...

ELMCON 1 24126� � � �

1 5569 5613 5567 56102 5567 5569 5610 55683 5569 5613 5610 5612...

STRAIN 1 241261 0.144655E-012 0.659788E-023 0.405799E-01

Deform Output: Bohren.dat Converter: Mesh.coviseStrain.covise

...

Mesh.covise

Strain.covise

Covise: Virtual Reality

VR Desktop

Präs

ent_

d.p

pt


Use of Virtual Reality Post Processing

Mesh.covise Strain.covisemesh data

mesh of domain surface

data of domain surface

Präs

ent_

d.p

pt


Moduls of Virtual Reality Post Processing

modules of Virtual Reality Post Processing

visualization ofdomain surface

cutting of domain surface

cutting planes

color transferof data

visualization ofiso surfaces

animationof time steps

Volume Rendering

interactive probe

Präs

ent_

d.p

pt


Comparative Visualization in Virtual Reality Post Processing

Parameter Studiesin Simulation:

• cutting parameter• material parameter• numerical parameter

Comparative Visualization:

• synchron over severaltimesteps

• with same color maps• superimposed

Präs

ent_

d.p

pt


Example of Virtual Reality Post Processing

3D-Simulation Bohren:

• Visualization of stress distribution

Used Modules:

• Colors• Domain Surface• Cut Geometry• Cutting Surface• Animation• Probe• Scale World• Move World

Präs

ent_

d.p

pt


Virtual Process Eingineering

AdvantEdge

CATIA „NC Manufacturing“ New Interfaces

Integratedvisualisation of micro and macroprocess in VirtualReality System

power,temperature

tool path,NC Programm

Manufacturing time,Comparisson of temperature,Comparisson of power,3D Visualisation

Präs

ent_

d.p

pt


Table of Contents






Präs

ent_

d.p

pt


Benefit of Virtual Reality

What benefit do you have?20% reduction of physical prototypesreduction of constructional faultshorter product development timehigher product qualityimprovement of communication in interdisciplinary teamsfaster and cheaper check of different versionse.g. DaimlerChrysler has 8 different versions of a new carwhich are evaluated with VR, only 3 versions are build as physicalprototypesperception of depth due to stereo visualizationbetter visualization due to large projection screensintuitive human machine interface due to tracking

Source: Fraunhofer IPT

Source: Fraunhofer IPT

Präs

ent_

d.p

pt


Contact at Fraunhofer IPT

Dipl.-Ing. Indra Kusumah

ProzesstechnologieFraunhofer-Institut für Produktionstechnologie IPTSteinbachstrasse 17 D-52056 Aachen

0241 – 8904 2430241 – 8904 [email protected]

virtual reality masterlecture 2007 - rwth aachen university · präsent_d.ppt © wzl / ipt seite 1...

Documents