Engineering Software · 2013-05-28 · 3D Printing: Software Model to Solid Objects • 3D printing...

ENGG1811 © UNSW, CRICOS Provider No: 00098G Engineering Software slide 1

ENGG1811: Computing for Engineers

Engineering Software   Computer Aided

Design

  Mathematical modelling and simulation

  Other specialised software

Cartoon by Roger Penwill, www.cadalyst.com/management/cad-cartoon-6373


Computer-Aided Design

•  CAD software is an essential engineering tool •  2D drawings and 3D objects with exact dimensions •  Plans and mapping •  3D modelling views using newer rendering and

visualisation algorithms •  Supports standard object representations to allow

sharing of component designs •  May be programmable •  Goal is CAD/CAM (Computer Aided Manufacturing):

–  CAD design data used directly to drive a CNC* machine tool to create a physical component

* Computer Numerical Control, a natural extension of 19th century weaving machines, player pianos


Most popular product: AutoCAD®

•  First version released 1982 for early PCs •  Originally inputs were completely text command-based, still

persists as an option •  File format DWG is an industry standard •  Since 2008 has adopted an Office ribbon style menu structure •  Users tend not to upgrade older versions, for example, support

materials in Built Environment are for AutoCAD 2000 www.fbe.unsw.edu.au/Learning/autocad/

•  Can edit while in 3D view mode •  Demos on Autodesk’s website (www.autocad.com) or:

www.youtube.com/watch?v=rK58M_y43jY

•  Not the only CAD product, others include Solidworks, MicroStation, progeCAD (AutoCAD clone), Alibre


AutoCAD® 2002 Sample

Ref: bahko96.com

Note simple 3D rendering


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2010 Sample

Ref: rocksolidperspective.com


Other specialised software

•  Each engineering discipline represents a market for software to solve problems specific to that domain. Some examples follow

Coldes – Concrete column design, www.microstran.com.au/coldes.htm


More specialist software CerebroMix

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Numerical vs symbolic

Numerical software •  Ex: Excel, Matlab •  Matlab is primarily

numerical with symbolic add-on

•  Numerical calculations

Symbolic software •  Ex: Maple, Mathematica •  Arbitrary number of

significant figures •  Differentiate or integrate

symbolic expressions •  Simplify algebraic

expressions



Mathematical Modelling and Simulation

•  Maple and MapleSim www.maplesoft.com –  core computations in Maple –  MapleSim built on top for dynamic modelling –  example: Mechanical/Hydraulic model used to increase

loading cap of scissor lift (see vendor’s site)


Mathematical Modelling, continued

•  Mathematica www.wolfram.com/mathematica/

–  symbolic package with visualisation language

–  more suitable for demos example: Quarter car suspension

http://demonstrations.wolfram.com/SimulatingVehicleSuspensionWithASi

mplifiedQuarterCarModel/


Mathematical Modelling, continued

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used in related MathWorks products

such as SimuLink

3D Printing: Software Model to Solid Objects

•  3D printing (also known as additive manufacturing) creates a solid 3D object from a software model (i.e. an AutoCAD model to a solid 3D object).

•  In 3D printing, an object is created by laying down successive layers of material (known as an additive processes).

•  Easy to customise a software model, in order to create a customised product (3D object), like dental implants, height adjusted table, etc.

•  On demand customised production! Is it the end of “mass production” ?

•  “A third industrial revolution” – The Economist (21/April/2012)

•  Video presentation:

http://www.cse.unsw.edu.au/~en1811/13s1/3D-‐printing.html ENGG1811 © UNSW, CRICOS Provider No: 00098G Engineering Software slide 13

Becoming Multi-computerlingual

•  Each language has its own features •  Assignment, if-elseif, for, while are

constructions that you find in many computer languages

•  Syntax can be different but concepts and skills are transferrable!


sum = 0 for j = 1 To 10

sum = sum + j next j

VBA

sum = 0; for j = 1:10

sum = sum + j; end

Matlab

sum = 0; for (j = 1; j <= 10, j++) { sum = sum + j; }

C or C++


Conclusion

•  Engineers use both general-purpose and specialised software, according to need and availability

•  Packages assist in the design process by improving −  design times (productivity increase) −  how well engineers understand the problem and

the selected solution (through modelling) −  reliability of the design due to inbuilt error checks −  design-to-manufacture processes (especially with

CAD/CAM) •  As with all design activities, whether planning or

drafting or programming or anything else…

make sure the final product solves the problem you have in mind, not something else.

Engineering Software · 2013-05-28 · 3D Printing: Software Model to Solid Objects • 3D printing...

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