Exploratory design using constraints

1987 ◽  
Vol 1 (1) ◽  
pp. 59-71 ◽  
Author(s):  
Weng Tat Chan ◽  
Boyd C. Paulson
Keyword(s):  
Structural Design ◽  
Computer Aided Design ◽  
Design Solution ◽  
Simple Scheme ◽  
Dual Nature ◽  
Design Changes ◽  
Heuristic Procedures ◽  
Rules Of Thumb ◽  
Design Consistency ◽  
Aided Design

Engineering design involves the evaluation and satisfaction of a wide variety of constraints. The ability to represent and process these constraints in a computer is important for the verification of the output produced by computer-aided design programs. Constraints need not only check designs but can also be used to derive design solution s that satisfy constraints. The paper discusses how to represent the dual nature of constraints so that design consistency is maintained as the design evolves.Assumptions and rules of thumb are used frequently in design to propose initial solutions. We represent the logic behind the derivation of these assumptions as heuristic procedures and maintain the dependencies between these assumptions and their consequents as an aid to the management of design consistency. We also propose a simple scheme, involving the partitioning of the design modules, to effect design changes when constraint violations occur. An example from structural design illustrates the methodology.

INTEGRATION AND EVALUATION OF A PROPOSAL FOR STRATEGIC KNOWLEDGE TEACHING IN CAD

10.6036/9505 ◽  
2021 ◽  
Vol 96 (1) ◽  
pp. 145-149
Author(s):  
XABIER GARIKANO OSINAGA ◽  
MIKEL GARMENDIA MUJIKA ◽  
ANGEL PEREZ MANSO ◽  
ENEKO SOLABERRIETA MENDEZ
Keyword(s):  
Computer Aided Design ◽  
Empirical Test ◽  
Control Group ◽  
Strategic Knowledge ◽  
Learning Framework ◽  
Design Changes ◽  
Professional Requirements ◽  
Teaching Learning ◽  
Didactic Strategies ◽  
Aided Design

Computer-aided design competency is critical for an engineering graduate starting in the world of work. Therefore, the development of this competency must be in line with professional requirements and consider the design constraints. For example, in the case of modeling, a geometrically correct model may not be sufficient if it is unable to withstand the modifications required by design changes. Therefore, we consider that training must be based on the development of this knowledge, known as strategic knowledge, and encourage its acquisition. This article describes a CAD training proposal focused on the development of strategic knowledge. Starting from the contributions of researchers, the modeling process is broken down so that it can be reproduced in the different scenarios that may be presented at the time of modeling. In order to facilitate the acquisition of this knowledge, an active learning framework has been established and specific didactic strategies have been developed for this purpose. Finally, the results of an empirical test are presented after the implementation of this proposal in which the results show a notable improvement in the experimental group in relation to the control group. Keywords: CAD modeling, teaching-learning, strategic knowledge

WirePATH Rapid Tooling Process and Supporting Software Development

2003 ◽  
Author(s):  
Alexander Lee ◽  
James Brink ◽  
David Anderson ◽  
Karthik Ramani
Keyword(s):  
Computer Aided Design ◽  
Electrical Discharge Machining ◽  
Computer Software ◽  
Wire Edm ◽  
Overall Design ◽  
Design Changes ◽  
Mold Making ◽  
Recent Developments ◽  
New Applications ◽  
Aided Design

Recent developments in Computer Aided Design (CAD) have drastically reduced overall design cycle time and cost. In this paper, wirePATH, a new method for rapid direct tooling, is presented. By using specialized interactive segmentation computer software and wire electrical discharge machining (wire EDM), wirePATH can reduce manufacturing time and cost for injection molds, casting patterns, and dies. Compared to other conventional-mold making methods, wirePATH can reduce fabrication time by as much as 40 to 70%. Wirepath can use a combination of wire EDM and other processes. Our method provides a new means to produce a greater variety in products by changing only portions of the tooling. Segments allow a part of a mold to be replaced to accommodate design changes and repair. WirePATH enables new applications of wire EDM to more complex shapes by bridging the gaps between CAD, our method, wire EDM and conventional manufacturing processes.

scholarly journals The Quiet Forefront

2014 ◽  
Vol 136 (08) ◽  
pp. 44-49 ◽  
Author(s):  
Jean Thilmany
Keyword(s):  
Computer Aided Design ◽  
Consumer Electronics ◽  
Element Analysis ◽  
Design Engineers ◽  
Acoustical Analysis ◽  
Design Changes ◽  
Development Cycle ◽  
Design Cycle ◽  
The Many ◽  
Aided Design

This article highlights the acoustical analysis changes made by manufacturers in design cycle. Acoustical simulation is being pushed from experts to designers, following the trend for the last 15 or so years that saw other types of engineering applications like finite element analysis and computational fluid dynamics become integrated with computer-aided design packages used by mechanical engineers. With the advent of software packages that allow for design and for acoustical analysis in tandem, design engineers are increasingly running these analyses early in the development cycle and are making design changes to decrease noise and vibration issues they find. Experts suggest that with speaker sound quality and other pertinent information in hand, designers can actually design from the get-go with that information in mind, resulting in fewer design changes down the line. Though early acoustical simulation is still perhaps one of the consumer electronics’ industries best-kept secrets, that’s likely to change as word gets out about the many advantages of front-line simulation.

A Vision-Based Framework for Enhanced Quality Control in a Smart Manufacturing System

2019 ◽  
Author(s):  
Zixuan Yang ◽  
Huaiyuan Teng ◽  
Jeremy Goldhawk ◽  
Ilya Kovalenko ◽  
Efe C. Balta ◽  
...  
Keyword(s):  
Computer Vision ◽  
Quality Control ◽  
Computer Aided Design ◽  
Manufacturing Systems ◽  
Smart Manufacturing ◽  
Dimensional Metrology ◽  
Design Changes ◽  
Central Controller ◽  
Aided Design ◽  
Smart Manufacturing Systems

Abstract Dimensional metrology is an integral part of quality control in manufacturing systems. Most existing manufacturing systems utilize contact-based metrology, which is time consuming and not flexible to design changes. There have been recent applications of computer vision for performing dimensional metrology in manufacturing systems. Existing computer vision metrology techniques need repeated calibration of the system and are not utilized with data analysis methods to improve decision making. In this work, we propose a robust non-contact computer vision metrology pipeline integrated with Computer Aided Design (CAD) that has the capacity to enable control of smart manufacturing systems. The pipeline uses CAD data to extract nominal dimensions and tolerances. The dimensions are compared to the measured ones, computed using camera images and computer vision algorithms. A quality check module evaluates if the measurements are within admissible bounds and informs a central controller. If a part does not meet a tolerance, the central controller changes a program running on a specific machine to ensure that parts meet the necessary specifications. Results from an implementation of the proposed pipeline on a manufacturing research testbed are given at the end.

scholarly journals Mathematical software of CAD systems of facilities of industrial and transport infra-structure in timber industry

10.12737/3348 ◽  
2014 ◽  
Vol 4 (1) ◽  
pp. 75-80
Author(s):  
Данилов ◽  
Aleksandr Danilov ◽  
Афоничев ◽  
Dmitriy Afonichev ◽  
Петровский ◽  
...  
Keyword(s):  
Structural Design ◽  
Computer Aided Design ◽  
Transport Infrastructure ◽  
Optimal Placement ◽  
Mathematical Software ◽  
Timber Industry ◽  
Cad Systems ◽  
Computer Aided ◽  
Aided Design ◽  
The Brain

The mathematical software computer aided design (CAD) of objects of production and transport infrastructure in timber industry (TI) is given, feature of which is the following. Tasks of establishing the optimal placement options of spur road on felling and loading points along it are solved together. At the next stage, the structural design of collapsible coatings of spur roads and topping hair-pin bend is made, if such coating is provided. Depending on the characteristics of accepted structures of the brain and deep sections of spur roads its length in the cutting area.

Toward automated elastic design of skeletal structures using computer graphics

1976 ◽  
Vol 3 (2) ◽  
pp. 279-287
Author(s):  
John H. Curran ◽  
Peter M. Wright
Keyword(s):  
Computer Graphics ◽  
Structural Design ◽  
Computer Aided Design ◽  
High Speed ◽  
Structural Parameters ◽  
Design Decisions ◽  
Displacement Constraints ◽  
Aided Design ◽  
Elastic Design ◽  
Conventional Computer

The purpose of this paper is to demonstrate that the introduction of computer graphics to the field of automated structural design alleviates many of the problems inherent in the use of high speed digital computers in structural design by permitting an interaction between the designer and the design program.This interaction provides significant advantages over conventional computer-aided design. The input of data is facilitated, and the designer can verify that the data are correct by having them displayed on the screen. The designer is able to control the optimization while it is in progress. By examining the results after each iterative cycle, he is able to implement design decisions and terminate the design when satisfactory convergence is achieved. Foremost, the designer is given an intuitive knowledge of the structural problem he is dealing with because he is able to examine in one session with the computer, the effect of various structural parameters, such as column spacing and displacement constraints.

scholarly journals An Exploratory Study Comparing CAD Tools and Working Styles for Implementing Design Changes

2019 ◽  
Vol 1 (1) ◽  
pp. 1383-1392
Author(s):  
Vrushank Shripad Phadnis ◽  
Kevin Alfonso Leonardo ◽  
David Robert Wallace ◽  
Alison Louise Olechowski
Keyword(s):  
Exploratory Study ◽  
Computer Aided Design ◽  
Value Added ◽  
Cad Model ◽  
Collaborative Environment ◽  
Design Changes ◽  
Communication History ◽  
Preliminary Study ◽  
Aided Design ◽  
Future Work

AbstractThis paper presents the findings of a preliminary study comparing implementation of design changes using various computer-aided design (CAD) working styles. Our study compares individuals’ and pairs’ completion of a series of changes to a toy car CAD model. We discuss the results in terms of productivity and value added ratio, derived from time-based quantitative data. We also discuss qualitative findings acquired through post-study surveys. Overall, our findings suggest that pairs were less efficient than individual designers due to overheads like communication, history dependency and complex couplings within the CAD model tree. However, it is also noteworthy that within each pair the lead participant's performance was at par with individual participants. Lastly, we also discuss behaviors and patterns that emerge as unique to the synchronous collaborative environment, motivating future work.

Novel Structural Design of a Bicycle Saddle to Fulfill Cyclist Physiological Requirements

2020 ◽  
Vol 14 ◽  
Author(s):  
Wei-Long Chen ◽  
Fang-Lin Chao
Keyword(s):  
Injection Molding ◽  
Structural Design ◽  
Mass Production ◽  
Computer Aided Design ◽  
Vertical Load ◽  
High Deformation ◽  
Computer Aided ◽  
Continuous Curvature ◽  
Aided Design ◽  
Plastic Injection

Background: The perineum area that interacts with the saddle is vulnerable; compressing neurovascular tissues has been asserted as the link of pathologies. Existing saddle designs are mainly based on the hole blocks, which are composed of two materials. These composite combined structures increase manufacturing difficulty Objective: The injection molding technology is suitable for mass production. We proposed a saddle design to meet the ergonomic requirements of cyclists. Saddle frames present a continuous curvature geometry to ensure a improved injection modeling. Methods: Static numerical calculations and measurements were employed for vertical load evaluations; with different stiffness regions acquired using perforated chain patterns. Two-step plastic injection molding was utilized with proper bonding and processing compatibility. In prototyping, the first and second shots are PC and TPE, respectively Results: The frame sustains vertical loadings from bending and provides adequate stiffness and proper flexibility. The computer-aided design mold increases the contact area, and annular grooves increase the adhesion between two materials. The outer frame exhibits high rigidity; the middle area exhibits flexibility and high deformation. Conclusion: This question is widely noticed and various answers were proposed. By investigating the patent database and searching journal papers on saddle designs, the authors confirmed the novelty of the proposed structure.

Computer-Aided Design of a Diesel Engine Chassis Mount Using the Finite Element Method

1988 ◽  
Author(s):  
K. Haghighi ◽  
M. G. Smith ◽  
G. W. Krutz ◽  
L. Bennett ◽  
J. W. Buchanan
Keyword(s):  
Finite Element ◽  
Diesel Engine ◽  
Static Loading ◽  
Computer Aided Design ◽  
Element Model ◽  
Critical Area ◽  
The Finite Element Method ◽  
Design Changes ◽  
Aided Design ◽  
Successful Reduction

Abstract A new diesel engine mounting bracket, that was used as a part of a repowering package for one ton trucks, was analyzed by using a finite element model under an equivalent static loading to simulate maximum service loads. Upon finding stresses above the yield strength of the material, alterations in the design were made to stiffen the bracket in the areas of high stresses, the maximum of which was at the isolator mounting hole. This new design added several dimples and bends to increase the stiffness of the entire bracket, especially in the isolator mounting area. The results of these design changes indicated a successful reduction of the stress in that critical area. The fatigue life was evaluated for the chassis mount, and was found to be acceptable for this retrofit condition.

scholarly journals Scientific basis and rules of thumb in civil engineering: conflict or harmony?

2016 ◽  
Vol 64 (4) ◽  
pp. 665-673 ◽  
Author(s):  
L. Czarnecki ◽  
D. Van Gemert
Keyword(s):  
Computer Aided Design ◽  
Material Model ◽  
Scientific Basis ◽  
Construction Engineering ◽  
Scientific Institutions ◽  
Rules Of Thumb ◽  
Building Information ◽  
Under Construction ◽  
Technical Features ◽  
Aided Design

Abstract Science and engineering intermingle in the area of construction. Engineering works, often of great dimensions and design life cycle of many decades, have to be designed on a scientific basis since the safety of hundreds of users depends on their design. The task of scientific institutions is to define the construction performance within categories that correspond to the contemporary level of knowledge and technology. A construction appraiser who speaks out in a way that ensures unquestionable competence about the performance of elements and buildings (existing and under construction), should be convinced of the scientific basis of his opinions. A comparison of construction sections vs. basic requirements presents an archetype of the science of construction. A matrix of the science of construction reveals its multi-faceted nature; if related to time – the issue of durability has to be considered, and if related to the scale – the complexity. Defining the construction performance in terms of technical features is a constant search for a relationship between the material model and the usability model of a building. The construction industry uses a lot of “rules of thumb”, more than any other sector of technology. In the era of computer-aided design, CAD, and building information modelling (BIM), those rules of thumb remain invaluable verification tools.

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