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

rendering software

Answer 3

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

Question 4

2 types of modelling in cad

Answer 4

surface or solid

Question 5

surface modelling

Answer 5

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

Question 6

solid modelling

Answer 6

a type of modelling in cad
clear representations of the final part. provide a complete set of data for product realisation (including internal structures)

Question 7

cad modelling strategies

Answer 7

1. top down
2. bottom up
3. hybrid

Question 8

top down strategy

Answer 8

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

Question 9

bottom up strategy

Answer 9

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

Question 10

hybrid

Answer 10

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

Question 11

virtual prototyping

Answer 11

photorealistic interactive cad models that use surface and solid modelling.

Question 12

virtual prototyping is good because it can

Answer 12

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

Question 13

digital humans

Answer 13

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

Question 14

motion capture

Answer 14

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 15

haptic technologies

Answer 15

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 16

virtual realities

Answer 16

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 17

animation

Answer 17

linking graphic screens together to simulate a certain process. tends to be cheaper and quicker than vr

Question 18

FEA

Answer 18

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

Question 19

nuances of fea

Answer 19

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

Question 20

cad advantages

Answer 20

quickly make changes
files stored securely
high accuracy

Question 21

cad disadvantages

Answer 21

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

Question 22

two common forms of FEA

Answer 22

1 fatigue – product durability
2 heat

Question 23

data modelling

Answer 23

determines structure of data in an information system