Conflict Resolution of Boolean Operations by Integration in Real-Time Collaborative CAD Systems

Functionality to Facilitate Assembly of Heavy Machines in a Virtual Environment

Volume 1: 20th Computers and Information in Engineering Conference ◽

10.1115/detc2000/cie-14590 ◽

2000 ◽

Author(s):

Frank Taylor ◽

S. Jayaram ◽

U. Jayaram ◽

Tatsuki Mitsui

Keyword(s):

Real Time ◽

Virtual Environment ◽

Physical Modeling ◽

Virtual Assembly ◽

Cad Model ◽

Cad Systems ◽

Overhead Cranes ◽

Heavy Machinery ◽

Assembly Sequences ◽

Human Hands

Abstract This paper describes a methodology for simulating the virtual assembly of heavy machinery. Heavy machinery or parts are described in this paper as objects too heavy to safely lift with two hands. Virtual assembly of heavy machinery poses special problems that are not seen in assemblies composed of parts easily manipulated with human hands. This paper identifies some of the difficulties associated with real-time virtual assembly of heavy machinery, and proposes methods for addressing these problems. We describe a method for reorganizing the assembly tree outside of traditional CAD systems to better simulate assemblies with numerous parts. This allows the user to control the assembly sequences, which are simulated in the virtual environment without changing the assembly hierarchy of the original CAD model. This paper also proposes methods for simulation of overhead cranes and the physical modeling of crane-part interactions, providing real-time virtual manipulation of heavy objects.

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Dynamic Priority Assignment and Conflict Resolution in Real Time Databases

International Journal of Computer Applications ◽

10.5120/93-194 ◽

2010 ◽

Vol 1 (4) ◽

pp. 110-111

Author(s):

Alok Kumar

Keyword(s):

Conflict Resolution ◽

Real Time ◽

Priority Assignment ◽

Dynamic Priority

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An Approach to Supporting Synchronized Collaborative Design Within Heterogeneous CAD Systems

Volume 4: 24th Computers and Information in Engineering Conference ◽

10.1115/detc2004-57703 ◽

2004 ◽

Cited By ~ 7

Author(s):

Min Li ◽

Shuming Gao ◽

Jie Li ◽

Youdong Yang

Keyword(s):

Real Time ◽

Collaborative Design ◽

System Modeling ◽

Object Oriented ◽

Preliminary Test ◽

Test Results ◽

Cad Systems ◽

The Real

This paper presents an approach to building up a synchronized collaborative design platform upon heterogeneous CAD systems. In the approach, Neutral Modeling Commands are used to achieve the real-time exchange of modeling operations between heterogeneous CAD systems. For the Neutral Modeling Commands, an object oriented representation is given and employed to support the translation between System Modeling Operations (SMO) and Neutral Modeling Commands (NMC). Moreover, two kinds of translators, SMO-to-NMC and NMC-to-SMO, are established, which can deal with modification/deletion operations and composite features and user-defined features besides common creation operations. The preliminary test results show that the proposed approach is promising.

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A novel CRDT-based synchronization method for real-time collaborative CAD systems

Advanced Engineering Informatics ◽

10.1016/j.aei.2018.08.008 ◽

2018 ◽

Vol 38 ◽

pp. 381-391 ◽

Cited By ~ 8

Author(s):

Xiao Lv ◽

Fazhi He ◽

Yuan Cheng ◽

Yiqi Wu

Keyword(s):

Real Time ◽

Cad Systems ◽

Synchronization Method

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CRDT-based Conflict Detection and Resolution for Massive-scale Real-time Collaborative CAD systems

Proceedings of the 12th Chinese Conference on Computer Supported Cooperative Work and Social Computing - ChineseCSCW '17 ◽

10.1145/3127404.3127436 ◽

2017 ◽

Cited By ~ 2

Author(s):

Xiao Lv ◽

Fazhi He ◽

Weiwei Cai ◽

Yuan Cheng ◽

Yiqi Wu

Keyword(s):

Real Time ◽

Conflict Detection ◽

Cad Systems ◽

Massive Scale ◽

Conflict Detection And Resolution

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Real-Time Collaborative Design With Heterogeneous CAD Systems Based on Neutral Modeling Commands

Journal of Computing and Information Science in Engineering ◽

10.1115/1.2720880 ◽

2006 ◽

Vol 7 (2) ◽

pp. 113-125 ◽

Cited By ~ 61

Author(s):

Min Li ◽

Shuming Gao ◽

Charlie C. L. Wang

Keyword(s):

Real Time ◽

Collaborative Design ◽

Computer Aided Design ◽

Time Synchronization ◽

System Modeling ◽

Cad Systems ◽

Network Bandwidth ◽

Product Models ◽

Aided Design ◽

Developing System

This paper presents an integration-based solution for developing a real-time collaborative design (co-design) platform on heterogeneous computer-aided design (CAD) systems. Different from the visualization-based approaches, the product models are allowed to be constructed and modified from various sites together in the proposed collaborative design platform. Our approach is based on a mechanism for the translation between system modeling operations (SMOs) and neutral modeling commands (NMCs). Every operation given by a user on one site is translated into a NMC and transmitted to all the other sites through the network, and then the received NMC is converted into corresponding SMOs on every other site, instantaneously. Since only the commands but not the product data are transferred, the data size under transmission is greatly reduced, so that a real-time synchronization can be achieved with a standard network bandwidth. In addition, by developing system-dependent SMO↔NMC translators on different client CAD systems, users on different sites could join the collaboration by using their familiar CAD systems; this is the benefit that cannot be offered by the homogeneous co-design systems. The prototype implementation proves that our approach works well for integrating various current popular commercial CAD systems into a real-time collaborative design platform.

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