Virtual Reality - RWTH Aachen 2005-11-04آ  Virtual Reality What is Virtual Reality? man made reality

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    Virtual Reality

    What is Virtual Reality?

    man made

    reality

    sense

    world

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

    Dipl.-Ing. Indra Kusumah Digital Product Design Fraunhofer IPT Steinbachstrasse 17 D-52074 Aachen

    Indra.kusumah@ipt.fraunhofer.de www.ipt.fraunhofer.de

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    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 IAO www.vr.iao.fhg.de

    Virtual Reality Triangle I3

    Virtual Reality in Product Development

    Virtual Reality Technology

    Virtual Reality Applications

    Benefit of Virtual Reality

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    Virtual Reality Triangle

    I3

    Burdea,1993

    human imagination creation of a virtual world problem solving application

    computer graphics simulation create a realistic looking world Interactivitiy being part of the action on the screen

    synthesized world is not static respond to user inputs device input, gesture, verbalcommands, etc.

    Immersion

    ImaginationInteraction

    Source: Adam Opel AG

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    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 IAO www.vr.iao.fhg.de

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    Virtual Reality in Product Development

    CAD

    FEM

    CAD-Model

    FEM-Model

    Adding Textures, Adding Sounds

    Definition of Groups, Definition of Constraints, Adding of Simulation

    Digital Mockup

    Real 3D

    Realtime Interaction

    Voice Control Force Feedback Tracking

    Distances between Objects

    Conversion from parametric to triangle data, Reduction of triangles, Generation of Level of Details

    Optimization

    Computer Graphic

    Rendering Imaging,

    CAVE, HMD, Desktop

    Stereo Projector Tracking

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    Digital Mockup of a Tool machine

    Digital Mockup of a wafer grinding machine

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    Table of Contents

    Virtual Reality Triangle I3

    Virtual Reality in Product Development

    Virtual Reality Technology

    Virtual Reality Applications

    Benefit of Virtual Reality Source: Fraunhofer IAO www.vr.iao.fhg.de

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    Virtual Reality Technology

    What do you need for an immersive Virtual Environment?

    High End Graphic Computer

    Stereo-Projection-System

    Software and Interfaces

    Interaction Devices

    Force Feedback Glove CyberGrasp Source: Virtual Technologies, Inc.

    2 sided CAVE Source: Fraunhofer IPT

    Software Virtual Design 2 Source: vrcom

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    High End Graphic Computer

    Option:

    SGI ONYX

    PC-Cluster

    SGI ONYX 3200 Source: Silicon Graphics Inc. PC Cluster

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    Stereo-Projection-System

    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 s Source: Stereographics

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    Stereo-Projection-System

    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-Lite Source: Trimension Systems

    Holobench Source: TAN Projektionstechnologie

    Head Mounted Display Source: Virtual Research Systems, Inc.

    Desktop VR Source: Stereographics

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    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

    Stylus Source: Polhemus

    sensor

    Select button

    Cable for tracking information

    Stylus and electromagnetic Emitter Source: Polhemus

    sensor

    stylus

    emitter

    Power supply

    Electromagnetic Emitter Source: Polhemus

    Force Feedback Roboter Source: SensAble

    Force Feedback Glove CyberGrasp Source: Virtual Technologies, Inc.

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    Table of Contents

    Virtual Reality Triangle I3

    Virtual Reality in Product Development

    Virtual Reality Technology

    Virtual Reality Applications

    Benefit of Virtual Reality Source: Fraunhofer IAO www.vr.iao.fhg.de

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    Virtual Reality Applications

    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

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    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

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    Combination of Design Review & Digital Mockup (Video)

    ...

    page 13

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    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

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    Assembly Simulation (Video)

    page 15

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    Assembly of elastic tubes (Video)

    generation of tube

    fixing of tube

    cutting of tube

    total length

    delete tube

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    Simulation and visualization of manufacturing processes

    Manufacturing Process

    Material Parameter

    Finite Element Method

    Virtual Reality

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    Steps of a Cutting Simulation

    material data flow 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 parameter feed [mm/ U] depth of cut [mm] ...

    simulation results cutting force temperature chip geometry

    distribution of • stress • strain • strainrate

    Numerical Influence • number of

    remeshing ste