A method of version merging for computer-aided design files based on feature extraction

2010 ◽  
Vol 225 (2) ◽  
pp. 463-471 ◽  
Author(s):  
C Sun ◽  
D Guo ◽  
H Gao ◽  
L Zou ◽  
H Wang
Keyword(s):  
Feature Extraction ◽  
Computer Aided Design ◽  
Application Programming Interface ◽  
Difference Set ◽  
Computer Aided ◽  
Application Programming ◽  
Feature Difference ◽  
The Difference ◽  
Aided Design ◽  
The Given

In order to manage the version files and maintain the latest version of the computer-aided design (CAD) files in asynchronous collaborative systems, one method of version merging for CAD files is proposed to resolve the problem based on feature extraction. First of all, the feature information is extracted based on the feature attribute of CAD files and stored in a XML feature file. Then, analyse the feature file, and the feature difference set is obtained by the given algorithm. Finally, the merging result of the difference set and the master files with application programming interface (API) interface functions is achieved, and then the version merging of CAD files is also realized. The application in Catia validated that the proposed method is feasible and valuable in engineering.

An oriented feature extraction and recognition approach for concave-convex mixed interacting features in cast-then-machined parts

2018 ◽  
Vol 233 (4) ◽  
pp. 1269-1288 ◽  
Author(s):  
Haichao Wang ◽  
Jie Zhang ◽  
Xiaolong Zhang ◽  
Changwei Ren ◽  
Xiaoxi Wang ◽  
...  
Keyword(s):  
Feature Extraction ◽  
Computer Aided Design ◽  
Feature Recognition ◽  
Freeform Surface ◽  
Layer By Layer ◽  
Computer Aided Process Planning ◽  
Computer Aided ◽  
Machined Parts ◽  
Aided Design ◽  
Interacting Features

Feature recognition is an important technology of computer-aided design/computer-aided engineering/computer-aided process planning/computer-aided manufacturing integration in cast-then-machined part manufacturing. Graph-based approach is one of the most popular feature recognition methods; however, it cannot still solve concave-convex mixed interacting feature recognition problem, which is a common problem in feature recognition of cast-then-machined parts. In this study, an oriented feature extraction and recognition approach is proposed for concave-convex mixed interacting features. The method first extracts predefined features directionally according to the rules generated from attributed adjacency graphs–based feature library and peels off them from part model layer by layer. Sub-features in an interacting feature are associated via hints and organized as a feature tree. The time cost is reduced to less than [Formula: see text] by eliminating subgraph isomorphism and matching operations. Oriented feature extraction and recognition approach recognizes non-freeform-surface features directionally regardless of the part structure. Hence, its application scope can be extended to multiple kinds of non-freeform-surface parts by customizing. Based on our findings, implementations on prismatic, plate, fork, axlebox, linkage, and cast-then-machined parts prove that the proposed approach is applicable on non-freeform-surface parts and effectively recognize concave-convex mixed interacting feature in various mechanical parts.

Computer Aided Design of Ultrasonic Test by Numerical Simulation

2021 ◽  
Vol 1164 ◽  
pp. 97-104
Author(s):  
Réka Erdei ◽  
Zoltán Bézi ◽  
Csaba Takács
Keyword(s):  
Computer Aided Design ◽  
Grain Orientation ◽  
Ultrasonic Test ◽  
Probability Of Detection ◽  
Test Method ◽  
Dissimilar Metal ◽  
Computer Aided ◽  
Aided Design ◽  
The Given ◽  
Sophisticated Technology

Ultrasonic tests of dissimilar metal welds require extremely sophisticated technology. The complexity of the test is caused by the grain orientation and difficult accessibility of the weld and it is therefore necessary to redound the examinations by simulation. This study details some application possibilities of CIVA software and presents an example of the evaluation of the procedure used for the given test method with probability of detection curves.

A Solution to the Missing-View Problem for Polyhedral Solids

1991 ◽  
Author(s):  
Y. L. Srinivas ◽  
Debasish Dutta
Keyword(s):  
Machine Vision ◽  
Computer Aided Design ◽  
Partial Information ◽  
Connectivity Matrix ◽  
Automated Inspection ◽  
Vertex Connectivity ◽  
Computer Aided ◽  
Inspection Systems ◽  
Aided Design ◽  
The Given

Abstract An algorithm for generating the missing view corresponding to a given pair of orthoghonal views of a polyhedral solid is presented. The solution involves reconstructing the solids from the partial information given and then generating the missing view. The input is a vertex connectivity matrix describing the given views. Reconstruction of solids from incomplete orthographic views will have applications in computer-aided design, machine vision and automated inspection systems.

Solving reachable workspace of some parallel manipulators by computer-aided design variation geometry

2008 ◽  
Vol 222 (9) ◽  
pp. 1773-1781 ◽  
Author(s):  
Y Lu ◽  
Y Shi ◽  
B Hu
Keyword(s):  
Computer Aided Design ◽  
Degrees Of Freedom ◽  
Parallel Manipulators ◽  
Six Degrees Of Freedom ◽  
Reachable Workspace ◽  
Spline Curves ◽  
Computer Aided ◽  
Design Variation ◽  
Aided Design ◽  
The Given

To shape the workspace of some novel parallel manipulators (PMs) is significant. A novel computer-aided design (CAD) variation geometry approach is proposed to shape and solve the reachable workspace of some PMs with three to six degrees of freedom (DOFs). Some basic techniques are described for designing the simulation mechanism and solving the reachable workspace. The simulation mechanisms of some PMs with three to six DOFs are created. When varying the driving dimensions of the active legs in the given extent, the simulation mechanisms vary correspondingly, and the position components of the moving platform are solved automatically. By transferring the position solutions into spatial spline curves in the simulation mechanism, all the boundary surfaces of the workspace can be created and visualized dynamically. Comparing with analytic approaches for solving workspace, the CAD variation geometry approach is simple, straightforward, accurate, and repeatable.

scholarly journals The concept of development of computer aided design programs for bridges or other engineering structures according to the specified criterion of optimality

2019 ◽  
Vol 15 (5) ◽  
pp. 345-352
Author(s):  
Pavel M. Salamakhin ◽  
Anton D. Chasovnikov
Keyword(s):  
Computer Aided Design ◽  
Optimality Criterion ◽  
Block Diagram ◽  
Engineering Structures ◽  
Sequential Approach ◽  
Computer Aided ◽  
Bridge Structures ◽  
Aided Design ◽  
The Given ◽  
Independent Parameters

In article on the basis of generalization of experience of creating in the period from 1997 to 2015 computer-aided design of various bridge structures by fifteen graduate students of the Department of Bridges and Transport Tunnels MADI (GTU) under the leadership of Doctor of Technical Sciences, Professor P.M. Salamakhin the authors proposed the concept of the development of the structure of standard programs of computer-aided design of bridge or other engineering structures according to the given optimality criterion. Given in the most general form of the complete block diagram of such programs with the detailed disclosure of the indicator of simultaneous execution of a set of requirements in all elements of the structure dependent scale in the sequential approach the minimum possible values, and also demonstrates how to determine the combination of values of all independent parameters of structures that provide the design of facilities according to the given optimality criterion. When working on the article, some provisions of earlier studies and the state of development of automation of design of bridge structures abroad are taken into account. The authors proceed from the fact that the proposed concept of development of computer-aided design of bridge and other engineering structures according to the specified criterion of optimality can and should be used as a model in the development of computer-aided design of structures with various generalized design schemes.

Virtual Simulation and Experimental Verification for 3D-printed Robot Manipulators

Robotica ◽  
2020 ◽  
pp. 1-11
Author(s):  
Jonqlan Lin ◽  
Kuan-Chung Lai
Keyword(s):  
3D Printing ◽  
Computer Aided Design ◽  
Low Cost ◽  
Joint Space ◽  
Virtual Simulation ◽  
Computer Aided ◽  
Simulated Motion ◽  
3D Printed ◽  
Aided Design ◽  
The Given

SUMMARY The objective of this work is to construct a robot that is based on 3D printing to meet the low-cost and light structures. The Computer-aided-design model is used with LabVIEW to simulate the given trajectory. Users of the simulation of such methodology can preview the simulated motion and perceive and resolve discrepancies between the planned and simulated paths prior to execution of a task. The advantages of this study are the lack of need to mount extra sensors on realistic robot to measure joint space coordinates, simplifying the hardware. These outcomes can also be used in an undergraduate robotics course.

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