Topic 3.4: Computer aided design Flashcards
CAD
computer aided design
the use of computers to aid the design process
2D vs 3D software
2D: produces 2d image of design, e.g adobe illustrator, adobe photoshop
3D: creates 3d model containing info on dimensions and materials, e.g. fusion 360 and sketchup
Parametric models
3d models that are defined by constraints and features, allow for changes to be made quickly and accurately
rendering software
creates realistic but virtual representation of the design, used for advertising, e.g blender, maya
ADV and DISADV of CAD software
ADV: changes/iterations can be made quickly, convenient communication between clients/manufacturers/designers, easily shared files, reduced costs (less errors and fewer physical prototypes)
DISADV: software can be expensive, specialized training required
Surface vs solid modelling
Surface: a realistic picture of the final model, offering some machining data. contains no data about the interior of the part/product
Solid: clear representations of the final part/product . provides a complete set of the data for the product to be manufactured
Bottom up modelling
Bottom up:
individual parts are designed separately and then assembled into the final design
components can be reused across multiple products
no relation between parts
detailed and precise parameters and design specifications established before designing
top down modelling
Top down:
new features and parts are added as the design evolves
design originates as a concept and gradually evolves into a complete product
obtained through parametric and associative CAD systems
FEA
Finite element analysis
the calculation and simulation of unkown factors in products using CAD systems.
common forms of fea: fatigue (durability, where cracks may be created), heat (how heat is transferred, where hotspots are and how it degrades), force and load
Digital humans
computer simulation of a variety of biological and mechanical aspects of the human body
Virtual prototyping
photorealistic cad based interactive models that use surface and solid modelling. can be considered digital mock-ups
Motion capture
the recording of human and animal movement by any means for example by video, magnetic or electro-mechanical devices
Haptic technology
interfaces the user via the sense of touch (e.g. when phone vibrates)
Virtual reality
the ability to simulate a real situation on the screen and interact with it in a near natural way
Animation
the ability to link graphic screens together in such a way to simulate motion or a process
