Physically Based Modeling in Virtual Assembly

2001 ◽  
Author(s):  
Yong Wang ◽  
Uma Jayaram ◽  
Sankar Jayaram ◽  
Kevin Lyons
Keyword(s):  
Virtual Reality ◽  
Computer Graphics ◽  
Computer Aided Design ◽  
Virtual Assembly ◽  
Physically Based Modeling ◽  
Gravitational Acceleration ◽  
Cad System ◽  
Physically Based ◽  
Aided Design ◽  
Assembly Models

Abstract Virtual assembly is a promising application of virtual reality in design and manufacturing and has drawn much attention from industry and research institutes. Physically based modeling has been an important research topic in computer graphics and virtual reality. In this paper, physically based modeling issues in virtual assembly are investigated. The specific requirements and characteristics of physically based modeling in virtual assembly versus those in traditional computer graphics are analyzed and studied. The mass properties of the assembly models are extracted from the Computer Aided Design (CAD) system while the design models are transferred from the CAD system to the virtual assembly environment. This added information allows the assembly models to be categorized using human strength survey data. The interaction of parts, environment objects, and the human are analyzed. In the fully immersed virtual environment, it is discovered that certain presentations of gravitational acceleration needs to be scaled down to achieve maximum realistic feeling. Finally the benefits and limitations of physically based modeling in virtual environments are discussed.

scholarly journals Physically Based Modeling in Virtual Assembly

2001 ◽  
Vol 5 (1) ◽  
pp. 185-199 ◽  
Author(s):  
Yong Wang ◽  
Sankar Jayaram ◽  
Uma Jayaram ◽  
Kevin Lyons ◽  
Peter Hart
Keyword(s):  
Virtual Reality ◽  
Computer Graphics ◽  
Computer Aided Design ◽  
Virtual Assembly ◽  
Physically Based Modeling ◽  
Cad System ◽  
Physically Based ◽  
Gravity Acceleration ◽  
Aided Design ◽  
Assembly Models

Virtual assembly is a promising application of virtual reality in design and manufacturing that has drawn much attention from industry and research institutes. Physically based modeling has been an important research topic in computer graphics and virtual reality. In this paper, physically based modeling issues in virtual assembly are investigated. The specific requirements and characteristics of physically based modeling in virtual assembly versus those in traditional computer graphics are analyzed and studied. The mass properties of the assembly models are extracted from the Computer Aided Design (CAD) system while the design models are transferred from the CAD system to the virtual assembly environment. The assembly models are categorized using human strength survey data. The interaction between the parts, the environment objects, and the human are analyzed. In the fully immersed virtual environment, it is discovered that the gravity acceleration needs to be scaled down to achieve maximum realistic feeling. Finally, the benefits and limitations of physically based modeling in virtual environments are discussed.

Iterative Part Design With a Virtual Reality Interface

1996 ◽  
Author(s):  
S. N. Trika ◽  
P. Banerjee ◽  
R. L. Kashyap
Keyword(s):  
Virtual Reality ◽  
Computer Aided Design ◽  
Three Dimensions ◽  
Mechanical Parts ◽  
Cad System ◽  
Current State ◽  
Feature Based ◽  
New Feature ◽  
Feature Based Design ◽  
Aided Design

Abstract A virtual reality (VR) interface to a feature-based computer-aided design (CAD) system promises to provide a simple interface to a designer of mechanical parts, because it allows intuitive specification of design features such as holes, slots, and protrusions in three-dimensions. Given the current state of a part design, the designer is free to navigate around the part and in part cavities to specify the next feature. This method of feature specification also provides directives to the process-planner regarding the order in which the features may be manufactured. In iterative feature-based design, the existing part cavities represent constraints as to where the designer is allowed to navigate and place the new feature. The CAD system must be able to recognize the part cavities and enforce these constraints. Furthermore, the CAD system must be able to update its knowledge of part cavities when the new feature is added. In this paper, (i) we show how the CAD system can enforce the aforementioned constraints by exploiting the knowledge of part cavities and their adjacencies, and (ii) present efficient methods for updates of the set of part cavities when the designer adds a new feature.

A Quantitive Analysis on Virtual Reality-Based Computer Aided Design System Interfaces

Manufacturing ◽  
2002 ◽  
Author(s):  
Chi-Cheng Chu ◽  
Rajit Gadh
Keyword(s):  
Virtual Reality ◽  
User Interface ◽  
Computer Aided Design ◽  
Effective Interaction ◽  
Design System ◽  
Human Beings ◽  
Cad System ◽  
Computer Aided ◽  
Interaction Approach ◽  
Aided Design

In this paper, a series of interface tests on interaction approach for the generation of geometric shape designs via multi-sensory user interface of a Virtual Reality (VR) based System is presented. The goal of these interface tests is to identify an effective user interface for VR based Computer-Aided Design (CAD) system. The intuitiveness of the VR based interaction approach arises from the use of natural hand movements/gestures, and voice commands that emulate the way in which human beings discuss geometric shapes in reality. The focus of this paper is on determining a set of effective interaction approaches by using the combinations of auditory, tactile, and visual sensory modalities to accomplish typical CAD tasks. In order to evaluate the proposed interaction approach, a prototypical VR-CAD system is implemented. A series of interface tests were performed on the prototypical systems to determine the relative efficiency of a set of potential interaction approach with respect to specific fundamental design tasks. The interface test and its results are presented in this paper.

A Quantitative Analysis on Virtual Reality-Based Computer Aided Design System Interfaces

2002 ◽  
Vol 2 (3) ◽  
pp. 216-223 ◽  
Author(s):  
Chi-Cheng Chu ◽  
Jianzhong Mo ◽  
Rajit Gadh
Keyword(s):  
Virtual Reality ◽  
User Interface ◽  
Computer Aided Design ◽  
Potential Interaction ◽  
Design System ◽  
Human Beings ◽  
Cad System ◽  
Computer Aided ◽  
Interaction Approach ◽  
Aided Design

In this paper, a series of interface tests on interaction approach for the generation of geometric shape designs via multi-sensory user interface of a Virtual Reality (VR) based System is presented. The goal of these interface tests is to identify an effective user interface for VR based Computer-Aided Design (CAD) system. The intuitiveness of the VR based interaction approach arises from the use of natural hand movements/gestures, and voice commands that emulate the way in which human beings discuss geometric shapes in reality. In order to evaluate the proposed interaction approach, a prototypical VR-CAD system is implemented. A series of interface tests were performed on the prototypical systems to determine the relative efficiency of a set of potential interaction approach with respect to specific fundamental design tasks. The interface test and its results are presented in this paper.

scholarly journals The Research of the Possibilities and Application of the AutoCAD Software Package for Creating Electronic Versions of Textbooks for "Engineering and Computer Graphics" Course

TEM Journal ◽  
2020 ◽  
pp. 1141-1149
Author(s):  
Alexey L. Khoroshko
Keyword(s):  
Computer Graphics ◽  
Training Program ◽  
Computer Aided Design ◽  
Software Package ◽  
High Quality ◽  
Cad Systems ◽  
Cad System ◽  
Technical Performance ◽  
Computer Aided ◽  
Aided Design

In this paper there are examples showing that AutoCAD (computer-aided design (CAD)) was and still is a powerful tool for technical graphics. Since Autodesk is a pioneer in the market of commercial widely available CAD systems, in this company CAD principles (which can be used by relatively unprepared users), nature and volume of teams, sequence and features of their implementation were developed. Despite the fact that today AutoCAD is only one of many packages, and its use as a training program guarantees not only high-quality training of specialists, but also the fact that the employee can easily switch to another CAD system, intuitively understanding the principles of function. In terms of technical performance, AutoCAD is a complete tool covering the entire spectrum of functions in the field of "Engineering and Computer Graphics" course.

Computer Graphics and Analysis in Elastomeric Compact Seal Design

1987 ◽  
Author(s):  
H. L. Johannesson
Keyword(s):  
Computer Graphics ◽  
Computer Aided Design ◽  
Design Procedure ◽  
General Purpose ◽  
Cad System ◽  
Seal Design ◽  
Simple Geometry ◽  
Complex Calculation ◽  
Application Programming ◽  
Aided Design

Abstract The use of advanced calculations are necessary in elastomeric seal design if the today situation of “trial and error” shall be avoided. In order to make it easy for the designer to carry out these calculations, computer graphics can be used together with calculation programs. In this work it is shown how a general purpose turn-key CAD-system can be used together with complex calculation programs in elastomeric compact seal design. It is demonstrated how communication between the CAD-system and the calculation program can be established with the use of the “graphic application programming language” that must be available within the CAD-system. The suggested computer aided design procedure is especially suitable for products like seals, which have simple geometry but require complicated calculations.

Haptic Guided Rigid Body Dynamics Study for Virtual Assembly in Mainstream CAD Systems

2007 ◽  
Author(s):  
Weihang Zhu
Keyword(s):  
Computer Aided Design ◽  
Virtual Assembly ◽  
Rigid Body Dynamics ◽  
Dynamics Simulation ◽  
Haptic Interface ◽  
Cad Systems ◽  
Cad System ◽  
Computer Aided ◽  
Cad Models ◽  
Aided Design

This paper presents our exploration in Haptic-guided Dynamics Simulation in a mainstream Computer-aided Design (CAD) System. Haptic interface, by providing force feedback in human-computer interaction, can improve the working efficiency of CAD/CAM (Computer-aided Design and Manufacturing) systems in a unique way. The full potential of the haptic technology is best realized when it is integrated effectively into the product development environment and process. For large manufacturing companies this means integration into a commercial CAD system [Stewart 1997]. Built on our past foundation work on an infrastructure of haptically enhanced CAD system [Zhu 2006], this research continues to explore the algorithms for dynamics simulation guided with haptic interface. This is fundamental to other tasks such as Virtual Assembly and Digital Mock-up. The research follows a modular haptic rendering algorithm for stable and transparent 6-DOF manipulation as presented in [Otaduy 2006], with improvements by leveraging the built-in CAD system functions and third party Dynamics Engines. The native CAD models are converted to triangulated meshes which are used in object-object collision detection and dynamics response computation. The major contribution of this paper is that we have developed a feasible methodology for haptic-guided dynamic interactions among CAD models inside mainstream CAD systems. It lays the foundation for future tasks such as direct CAD model modification and virtual assembly with the aid of haptic interface.

Virtual Assembly Design Environment

1995 ◽  
Author(s):  
Hugh I. Connacher ◽  
Sankar Jayaram ◽  
Kevin Lyons
Keyword(s):  
Virtual Reality ◽  
Research Effort ◽  
New Technology ◽  
Natural Extension ◽  
Virtual Assembly ◽  
Software Systems ◽  
Design Environment ◽  
Cad System ◽  
Assembly Design ◽  
Design And Manufacturing

Abstract Virtual reality is a technology which is often regarded as a natural extension to 3D computer graphics with advanced input and output devices. This technology has only recently matured enough to warrant serious engineering applications. The integration of this new technology with software systems for engineering, design and manufacturing will provide a new boost to the field of computer-aided engineering. One aspect of design and manufacturing which may be significantly affected by virtual reality is design for assembly. This paper presents the ideas behind a current research effort aimed at creating a virtual assembly design environment and integrating that environment with a commercial, parametric CAD system.

A CAD System for Designers’ Decision Making: An Approach With 2D and 3D Integrated and Hierarchical Assembly Models

1991 ◽  
Author(s):  
S. Minami ◽  
T. Ishida ◽  
S. Yamamoto ◽  
K. Tomita ◽  
M. Odamura
Keyword(s):  
Decision Making ◽  
Computer Aided Design ◽  
Mechanical Design ◽  
Prototype System ◽  
Dimensional Model ◽  
3 Dimensional ◽  
Hierarchical Assembly ◽  
Cad System ◽  
Aided Design ◽  
2D And 3D

Abstract A concept for the initial stage of the mechanical design and its implementation in the computer-aided design (CAD) are presented. The process of decision making in design is: (1) determining an outline of the whole assembly using a 2-dimensional model that is easy to operate; (2) checking the outline using a 3-dimensional model in which it is easy to identify the spatial relationships; (3) determining details of its sub-assemblies or their components using the 2-dimensional model; and (4) checking the details using the 3-dimensional model. The CAD system must provide consistent relationships through all the steps. For that, following functions are implemented in our prototype system: (1) a 2D and 3D integrated model for consistency between 2- and 3-dimensional shapes, (2) a hierarchical assembly model with dimensional constraints for consistency within an assembly and their components, and (3) a check on constraints for consistency between shapes and designers’ intentions. As a result, the system can provide an environment well fitted to the designers’ decision making process.

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