3.4

Question 1

CAD

Answer 1

use of computers to aid the design process. eliminates high cost of testing

Question 2

types of CAD modelling

Answer 2

1. 2d software
2. 3d software
3. rendering software

Question 3

2d software

Answer 3

form of CAD modelling
1. creates digital drawings for clients
2. some can be used cad equipment
3. circuits, floor plan etc

Question 4

3d software

Answer 4

form of CAD modelling
1. used by manufacture equipment
2. explore ideas for future prototyping

Question 5

rendering software

Answer 5

form of CAD modelling
creates realistic but virtual representation of design. for ads/clients

Question 6

2 types of modelling in cad

Answer 6

surface or solid

Question 7

surface modelling

Answer 7

a type of modelling in cad
realistic picture of the final model. no interior

Question 8

solid modelling

Answer 8

a type of modelling in cad
clear representations of the final part. they provide a complete set of data for product realisation

Question 9

cad modelling strategies

Answer 9

1. top down
2. bottom up
3. hybrid

Question 10

top down strategy

Answer 10

cad modelling strategy
originates as a concept w criteria, gradually evolves into a complete product consisting of components

Question 11

bottom up strategy

Answer 11

cad modelling strategy
parts created independent of assembly/other parts. then all parts are brought together for the first time

Question 12

hybrid

Answer 12

combination of both top down and bottom up strategies. some parts are designed individually while others – using the top down approach.

Question 13

virtual prototyping

Answer 13

photorealistic interactive cad models that use surface and solid modelling.

Question 14

virtual prototyping is good because it can

Answer 14

reduce development costs by identifying errors
reduce development time bcs designs can be modified quickly
improve quality of the final product

Question 15

digital humans

Answer 15

digital simulations of the biomechanics of the human body. used to predict how humans will interact with a virtual prototype

Question 16

motion capture

Answer 16

little detector thingies all over the body and as you move it captures your movement. it is more fluid, looks more natural, and records movement not appearance so you can change the body type etc

Question 17

haptic technologies

Answer 17

feedback when interacting with tech so that you know what youre doing. helps communicate to the user what theyre doing and that theyre doing something

Question 18

virtual realities

Answer 18

simulating a real situation on the screen and interacting with it in a near natural way. good bcs it provides an immersive 3d environment, and can help understand how a product will function

Question 19

animation

Answer 19

motion sequences that simulate a certain process. tends to be cheaper and quicker than vr

Question 20

FEA

Answer 20

finite element analysis – calculation of unknown factors in products (strain, aerodynamics, simulating stress in a car part…)

Question 21

nuances of fea

Answer 21

finite element analysis
you have to make sure its very careful or the answer will be useless.

Question 22

cad advantages

Answer 22

quickly make changes
files stored securely
high accuracy

Question 23

cad disadvantages

Answer 23

expensive software
incorrect data input can lead to errors
lack of tactile feedback

Question 24

two common forms of FEA

Answer 24

1 fatigue – product durability
2 heat

Question 25

data modelling

Answer 25

determines structure of data in an information system