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.

scholarly journals Online Design

2000 ◽  
Vol 122 (03) ◽  
pp. 68-72
Author(s):  
Jean Thilmany
Keyword(s):  
Computer Aided Design ◽  
High Speed ◽  
Personal Computers ◽  
Element Analysis ◽  
Mathematical Application ◽  
Design Engineers ◽  
Similar Work ◽  
Cad Models ◽  
Computer Based ◽  
Aided Design

This article discusses that computer-based technologies have greatly influenced the way design engineers work. The first technological innovation was the use of high-powered personal computers. With PCs, engineers had access to high-speed applications of computer-aided design software right at their own desks. Personal computers took the place of rulers and pencils. The second innovation, he said, is the advancing capability of PCs to function as supercomputers, crunching numbers much faster than formerly possible. By taking advantage of this technology, engineers untrained in a mathematical application such as finite element analysis can run an FEA software program that performs calculations automatically and will shave weeks off the design process. Hothouse uses the Spatial technology to repair CAD models brought in from outside sources and to translate CAD files the company sends to its suppliers, collaborators, and clients. Before Hothouse began sending CAD files to the online service, company employees spent days repairing or rebuilding files on their own. Sometimes suppliers or clients that received Hothouse CAD files had to do similar work on their end.

scholarly journals Making a Mesh of Things

2003 ◽  
Vol 125 (09) ◽  
pp. 54-56 ◽  
Author(s):  
Jean Thilmany
Keyword(s):  
Finite Element Analysis ◽  
Computer Aided Design ◽  
Element Analysis ◽  
Entry Level ◽  
Design Engineers ◽  
Computer Aided ◽  
Analysis System ◽  
Aided Design ◽  
Common User ◽  
Load Conditions

Models need to be meshed and made acceptable for analysis before finite element analysis (FEA) can be run. Software providers that make pre-processing applications must keep up with changes in FEA technology to remain competitive. The mesh contains the data on material and structural properties that define how the part will react to certain load conditions. Today's closely integrated computer-aided design (CAD), pre-processing, and FEA applications allow CAD and entry-level FEA technologies to work together within a common user interface and give design engineers a quick, effortless way to see if their designs will meet specifications. Simplifying the FEA programs so a design engineer can use them limits the intricacy of the mesh as well as the depth of analysis. HyperMesh prepares CAD geometries for analysis. The meshed geometries are then exported to Procter & Gamble's customized package analysis system called Virtual Package Simulation. Today, engineers use mesh technologies and attendant FEA programs for an array of analyses. Some are related to manufacturing, but as often as not they've found their way into other industries.

scholarly journals Pros and Cons of CAD

2006 ◽  
Vol 128 (09) ◽  
pp. 38-40
Author(s):  
Jean Thilmany
Keyword(s):  
Computer Aided Design ◽  
Digital Design ◽  
Design Engineers ◽  
Design Changes ◽  
Complex Shapes ◽  
Current Design ◽  
Pros And Cons ◽  
Aided Design ◽  
Straight Lines ◽  
A Current

This paper describes the pros and cons of computer-aided design (CAD). CAD packages lack features to easily make the intuitive, complex shapes so pervasive in modern products. It is much easier with CAD to create a part with square features and rectangles and straight lines and round things. Even in a current design project, engineers will sculpt the design in clay, scan it with a digitizer, bring it back into the CAD package, then change it into a solid model and refine that. One of the biggest criticisms of CAD systems is that digital design is slower than sketching and that inhibits the brainstorming process. Today’s systems are not equipped to let engineers play with a design. Engineers start with a basic design and they can change parameters as they draw, but cannot change complete concepts midstream or cut and paste ideas between designs. Most CAD packages include features that track design changes so engineers working collaboratively can see what's been changed, where, when, and why.

scholarly journals Beyond PDM

2001 ◽  
Vol 123 (03) ◽  
pp. 66-67
Author(s):  
Jean Thilmany
Keyword(s):  
Computer Aided Design ◽  
Product Data Management ◽  
Internet Technology ◽  
Web Browser ◽  
Design Cycle ◽  
The Everyday ◽  
Design Software ◽  
The Many ◽  
Aided Design ◽  
A Company

This article discusses recent changes in the definition and capabilities of product data management (PDM). The term “collaborative engineering” generally is applied to the newfound ability of engineers to design together across the miles using computer-aided design software that is linked by a PDM system and Internet technology. The system uses software and servers that take advantage of the Internet and an intranet, and include a common Web-browser interface that lets employees at a company and their suppliers interact, even if they are in separate locations. PDM systems are quickly becoming more than ways to archive past product designs and link engineers via their CAD systems. But the many uses of such systems can easily be confusing or overwhelming to the everyday user. Advocates, including Turk, Strom, and Bourke, argue that the movement to expand PDM systems beyond their initial use can make for a tighter design cycle and a bigger profit for engineering companies that take advantage of the possibilities.

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

scholarly journals Simulation Study of a Composite Landig Gear of Ultralight and Very Light Aircraft

2021 ◽  
Author(s):  
Paulina Zenowicz
Keyword(s):  
Simulation Study ◽  
Computer Aided Design ◽  
Landing Gear ◽  
Design Tool ◽  
Drop Test ◽  
Environment Design ◽  
Element Analysis ◽  
Computer Methods ◽  
The One ◽  
Aided Design

There is a need to design new, lighter aircraft structures, which has a direct impact on the safety and costs of aircraft maintenance. One of basic parts of an aircraft is ites landing gear, whose main functions are to enable taxiing, safe landing, take-off, and to assist the remainder of ground operations. Landing gear failures are usually related to metallurgy, processing, environment, design, and causes of overload. These are conditions that can be prevented using modern methods to calculate the strength of such a landing gear in various conditions. The paper presents stages of a simulation study of the fixed three-wheeled spring landing gear for an ultralight aircraft. Analysis of forces acting on the landing gear during drop test and their implementation by numerical computer methods allowed for the creation of a model in the CAD (Computer-Aided Design) tool and its FEA (Finite Element Analysis). These results were compared between a modeled classic spring landing gear and the one made of composite materials. The further goal of the research will be to build a drop test stand for a small landing gear used in airplanes and drones. This method has a significant impact on simplifying the design of the landing gear, its modeling, and optimization.

scholarly journals Designing Thin 2.5D Parts Optimized for Fused Deposition Modeling

2019 ◽  
pp. 134-164 ◽  
Author(s):  
James I. Novak ◽  
Mark Zer-Ern Liu ◽  
Jennifer Loy
Keyword(s):  
Computer Aided Design ◽  
Fused Deposition Modeling ◽  
Outer Wall ◽  
Fused Deposition ◽  
Design Engineers ◽  
Test Pieces ◽  
New Knowledge ◽  
Deposition Modeling ◽  
Aided Design ◽  
Reference Graph

This chapter builds new knowledge for design engineers adopting fused deposition modeling (FDM) technology as an end manufacturing process, rather than simply as a prototyping process. Based on research into 2.5D printing and its use in real-world additive manufacturing situations, a study featuring 111 test pieces across the range of 0.4-4.0mm in thickness were analyzed in increments of 0.1mm to understand how these attributes affect the quality and print time of the parts and isolate specific dimensions which are optimized for the FDM process. The results revealed optimized zones where the outer wall, inner wall/s, and/or infill are produced as continuous extrusions significantly faster to print than thicknesses falling outside of optimized zones. As a result, a quick reference graph and several equations are presented based on fundamental FDM principles, allowing design engineers to implement optimized wall dimensions in computer-aided design (CAD) rather than leaving print optimization to technicians and manufacturers in the final process parameters.

Effect of infill and density pattern on the mechanical behaviour of ABS parts manufactured by FDM using Taguchi and ANOVA approach

2021 ◽  
Vol 111 (2) ◽  
pp. 66-77
Author(s):  
M. Othmani ◽  
K. Zarbane ◽  
A. Chouaf
Keyword(s):  
Tensile Strength ◽  
Computer Aided Design ◽  
Numerical Test ◽  
Acrylonitrile Butadiene Styrene ◽  
Tensile Behaviour ◽  
Element Analysis ◽  
Mechanical Tensile ◽  
Experimental Values ◽  
The Cost ◽  
Aided Design

Purpose: The present work aims to investigate the effect of many infill patterns (rectilinear, line, grid, triangles, cubic, concentric, honeycomb, 3D honeycomb) and the infill density on the mechanical tensile strength of an Acrylonitrile Butadiene Styrene (ABS) test specimen manufactured numerically by FDM. Design/methodology/approach: Computer-Aided Design (CAD) software has been used to model the geometry and the mesostructure of the test specimens in a fully automatic manner from a G-code file by using a script. Then, a Numerical Design of Experiments (NDoE) has been carried out by using Taguchi method and the Analysis of Variance (ANOVA). The tensile behaviour of these numerical test specimens has been studied by the Finite Element Analysis (FEA). Findings: The FEA results showed that a maximal Ultimate Tensile Strength (UTS) was reached by using the ‘concentric’ infill pattern combined with an infill density of 30%. The results also show that the infill pattern and the infill density are significant factors. Research limitations/implications: The low infill densities of 20% and 30% that have already been used in many previous studies, we have also applied it in order to reduce the time of the simulations. Indeed, with high infill density, the simulations take a very excessive time. In an ongoing study, we predicted higher percentages. Practical implications: This study provided an important modelling tool for the design and manufacture of functional parts and helps the FDM practitioners and engineers to manufacture strong and lightweight FDM parts by choosing the optimal process parameters. Originality/value: This study elucidated the effect of various infill patterns on the tensile properties of the test specimens and applied for the first time a NDoE using numerical test specimens created by the mesostructured approach, which considerably minimized the cost of the experiments while obtaining an error of 6.8% between the numerical and the experimental values of the UTS.

Automatic Coordinate Measuring Machine Inspection

1999 ◽  
Author(s):  
V. A. Albuquerque ◽  
F. W. Liou ◽  
S. Agarwal ◽  
O. R. Mitchell
Keyword(s):  
Path Planning ◽  
Computer Aided Design ◽  
Coordinate Measuring Machine ◽  
Industrial Applications ◽  
Prototype Development ◽  
Development Cycle ◽  
Inspection Process ◽  
Measuring Machine ◽  
Aided Design ◽  
Point Placement

Abstract In many industrial applications, such as product prototype development, automation of inspection process can greatly improve product quality and product development cycle, time. This paper discusses a development of a vision aided automatic inspection using Coordinate Measuring Machine (CMM). We seek to integrate the flexibility afforded by computer vision systems with the precision of numerically controlled coordinate measuring machines to achieve a fully automatic and reliable inspection of the industrial parts. The 3-D design information and part specification from computer-aided design file is used for inspection point placement and CMM path planning. The proposed system demonstrates that optimal collision-free inspection paths can be efficiently generated for geometrically complex parts consisting of multiply intersecting features. This is made possible by using iterative subdivision of surfaces for point placement coupled with, efficient 3-D collision avoidance and path planning. The paper discusses different algorithms used, and presents experimental results.

Finite Element Analysis for a CAD of a Concrete Mixer Drum

1994 ◽  
Author(s):  
Hossam S. Badawi ◽  
Sherif A. Mourad ◽  
Sayed M. Metwalli
Keyword(s):  
Finite Element ◽  
Computer Aided Design ◽  
Three Dimensional ◽  
Plain Concrete ◽  
Element Analysis ◽  
Shell Elements ◽  
Bending Stresses ◽  
Loading Effects ◽  
Concrete Mixer ◽  
Aided Design

Abstract For a Computer Aided Design of a concrete truck mixer, a six cubic meter concrete mixer drum is analyzed using the finite element method. The complex mixer drum structure is subjected to pressure loading resulting from the plain concrete inside the drum, in addition to its own weight. The effect of deceleration of the vehicle and the rotational motion of the drum on the reactions and stresses are also considered. Equivalent static loads are used to represent the dynamic loading effects. Three-dimensional shell elements are used to model the drum, and frame elements are used to represent a ring stiffener around the shell. Membrane forces and bending stresses are obtained for different loading conditions. Results are also compared with approximate analysis. The CAD procedure directly used the available drafting and the results were used effectively in the design of the concrete mixer drum.

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