CAD and

VIRTUAL REALITYBY

DEEPAK. ROTTI

M.TECH 1ST SEM

K.L.S G.I.T, BELGUM

Introduction

Computer aided design.

Physical and digital interaction.

Virtual reality- illusion of physical environment.

Augmented reality

Virtual system: working

Data transfer from a CAD system to VR system.

Integration of models into the virtual environments

Creating a model.

Styling concepts within VR systems.

Integration into the virtual environment

Task definition

Model preparation

Preparation simulation

Interactive simulation

Evaluation

Illustration : Working

Creating a design model

1. Generating a model2. Preparing a model3. Presenting a model

1 2 3

Computer Aided Styling – Requirements and possibilities

Creative/artistic requirements

_ Intuitive

_ Fast

_ High quality visual images

_ Flexibility

_ Quick 3D verification

CAD based, industrial requirements

_ Data transparency

_ Painless link between systems

_ Mathematical accuracy

Computer aided styling systems

•Simultaneous availability of information •Less physical prototype _•Consistent description of product data• Possibility of early decision finding •Easy communication of ideas, due to high–end visualization• Multiuse• Comparable presentations in various contexts• Repeatability of presentations

Case Study and Results A small-scale assembly and a large size assembly

are taken for test.

In each virtual assembly operation, two sets of data were recorded.

Total time to perform the assembly and the time a user spends on reaching and trying to grab the parts (gripping time) were noted

Results:1) Assembly time in a virtual environment is lower than actual assembly time (about 10-15%).2) Assembly time for each part in the assembly increases with the physical size of the part3) Average gripping time for each part in the assembly remains almost the same for different sizes of the parts.

Conclusions: V.R systems do reduce burden on designer

and increase the usability of product. Design cycle can be repeated many times -

to optimize the product V.R find application in fields like – tool

engineering, R&D projects, design and testing of prototypes and simulation systems e.t.c.

Challenges of VR are- high initial cost, requires additional devices.

Regular users suffer from disorientation and simulation sickness.

V.R and A.R systems will play a vital role in future.

REFERRENCES1.From CAD to virtual reality: modeling approaches, data exchange and

interactive 3D building design tools by. Whyte ), N. Bouchlaghem 1, A. Thorpe, R. McCaffer.

2. A Virtual Assembly Design Environment

Sankar Jayaram, Yong Wang, Uma Jayaram and Kevin Lyons, Peter Hart

Manufacturing Systems Integration Division

National Institute of Standards and Technology

Gaithersburg, MD 20899

3. Virtual Reality –New methods for improving and accelerating the development process in vehicle styling and design

Frank Purschke, Malte Schulze, Peter Zimmermann

Volkswagen AG VR Lab.

4. Integration of Virtual Reality based Assembly Simulation into CAD/CAM environments

Roland Steffan, Ulrich Schull, Torsten Kuhlen

Department of Technical Computer Science

Aachen University of Technology, Germany.

5. INTEGRATION OF VIRTUAL ASSEMBLY WITH CAD

Hugh I. Connacher and Sankar Jayaram

School of Mechanical and Materials Engineering

Washington State University U.S.A

THANK YOU