virtual reality - rwth aachen university · 2005-11-04 · virtual reality what is virtual reality?...

Prä

sent

_d.

ppt

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 KusumahDigital Product DesignFraunhofer IPTSteinbachstrasse 17D-52074 Aachen

[email protected]

Prä

sent

_d.

ppt

Seite 2© WZL / IPT

Table of Contents

Virtual Reality Triangle I3

Virtual Reality in Product Development

Virtual Reality Technology

Virtual Reality Applications

Benefit of Virtual Reality

Virtual Reality at Fraunhofer IPT

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






Prä

sent

_d.

ppt

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

Prä

sent

_d.

ppt

Seite 4© WZL / IPT

Table of Contents






Virtual Reality at Fraunhofer IPT

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

Prä

sent

_d.

ppt

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

Prä

sent

_d.

ppt

Seite 6© WZL / IPT

Digital Mockup of a Tool machine

Digital Mockup of a wafer grinding machine

Prä

sent

_d.

ppt

Seite 7© WZL / IPT

Table of Contents





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

Prä

sent

_d.

ppt

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

Prä

sent

_d.

ppt

Seite 9© WZL / IPT

High End Graphic Computer

Option:

SGI ONYX

PC-Cluster

SGI ONYX 3200Source: Silicon Graphics Inc. PC Cluster

Prä

sent

_d.

ppt

Seite 10© WZL / IPT


What makes you see 3D?

Stereo Viewing enables to see real 3D, meaning distances between between objects

Two images with an average distance of 6.5 cm, which is the average eye distance, are necessary to enable real 3D

viewing

The brain superimposes both images to a 3D image

Different 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 Glasse sSource: Stereographics

Prä

sent

_d.

ppt



What kind of Stereo-Projection-Systems are available?

Screen projection systems

- CAVE (Computer Aided Virtual Environment),

- Holobench

Head Mounted Displays

Desktop graphic workstations

CAVE ReaCTor-LiteSource: Trimension Systems

HolobenchSource: TAN Projektionstechnologie

Head Mounted DisplaySource: Virtual Research Systems, Inc.

Desktop VRSource: Stereographics

Prä

sent

_d.

ppt


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 objects

Stylus, Spacemouse

Voice control

Force Feedback for friction, collision, gravity

Devices: PHANToM, Sensing Gloves

Accustic

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.

Prä

sent

_d.

ppt


Table of Contents






Prä

sent

_d.

ppt



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

Prä

sent

_d.

ppt


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

Prä

sent

_d.

ppt


Combination of Design Review & Digital Mockup (Video)

...

page 13

Prä

sent

_d.

ppt


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

Prä

sent

_d.

ppt


Assembly Simulation (Video)

page 15

Prä

sent

_d.

ppt


Assembly of elastic tubes (Video)

generation of tube

fixing of tube

cutting of tube

total length

delete tube

Prä

sent

_d.

ppt


Simulation and visualization of manufacturing processes

ManufacturingProcess

Material Parameter

Finite Element Method

Virtual Reality

Prä

sent

_d.

ppt


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

Prä

sent

_d.

ppt


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

Prä

sent

_d.

ppt


Use of Virtual Reality Post Processing

Mesh.covise Strain.covisemesh data

mesh of domain surface

data of domain surface

Prä

sent

_d.

ppt


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

Prä

sent

_d.

ppt


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

Prä

sent

_d.

ppt


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

Prä

sent

_d.

ppt


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

Prä

sent

_d.

ppt


Table of Contents






Prä

sent

_d.

ppt



What benefit do you have?

20% reduction of physical prototypes

reduction of constructional fault

shorter product development time

higher product quality

improvement of communication in interdisciplinary teams

faster 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

physicalprototypes

perception of depth due to stereo visualization

better visualization due to large projection screens

intuitive human machine interface due to tracking

Source: Fraunhofer IPT

Source: Fraunhofer IPT

Prä

sent

_d.

ppt


Contact at Fraunhofer IPT

Dipl.-Ing. Indra Kusumah

Prozesstechnologie

Fraunhofer-Institut für Produktionstechnologie IPTSteinbachstrasse 17 D-52056 Aachen

0 241 – 8904 243

0 241 – 8904 [email protected]

virtual reality - rwth aachen university · 2005-11-04 · virtual reality what is virtual reality?...

Documents