Computer Aided Design (CAD)

Computer aided design (CAD) is used to draw 2D and 3D designs on computer

CAD sofware pacakges can be downloaded and used to create designs on a computer

CAD software:

Advantages	Disadvantages
Designs can be created, saved and edited easily (saves time) Designs can be easily copied/repeated Designs can be easily sent to other offices/clients etc Designs can be worked on by remote teams simultaneously Designs can look photo-realistic to gain opinions from clients CAD is very accurate CAD software such as FEA/CFD can test design ideas under stress/aerodynamics	CAD sodtware is complex to learn Software can be very expensive Need a robust IT system/powerful computer Compatibility issues with software between users Security issues - risk of data being corrupted/hacked

Uses: Design of buildings, bridges, structures

3D modelling for creating 'virtual' products:

Advantages	Disadvantages
Don't have to wait for parts to dry Reduces development time/costs Can be easily adjusted No material wastage Can be produced on CAD	No physical feel of product Weight can't be measured Need a robust IT system/powerful computer

Uses: Virtual modelling of prototype products

Wire frame models (CAD):

Advantages	Disadvantages
Faster Less memory space Easier to send	Design shows little detail/colour of design

Uses: Structural designs

Surface modelling (CAD):

Advantages	Disadvantages
Realistic 3D view Easier to understand	Needs a powerful computer Time cosuming rendering design Lots of computer memory required Does not show internal features

Uses: Models, CGI

Finite Element Analysis (FEA): FEA is a computer run numerical method used to predict how an object/structure will behave under given conditions (e.g. loads and stresses). It can be used to find weak spots in designs and points of failure.

Computational fluid dynamics (CFD): CFD is a computer run numerical method used to study how steady and unsteady fluids (e.g. Gas and Liquids) flow over objects. It is often used for aerodynamic study.

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