Engineering design optimization

Question 1

engineering design

Answer 1

the process of deriving a system, component, or process to meet the desired needs, regardless of weather it is the best one as several systems can accomplish the same tasks

Question 2

design process steps (4)

Answer 2

1. define specifications for the system
2. develop a preliminary design
   3.using iterative process design all subsystems
3. fabricate a prototype and test

(all in feed back loops)

Question 3

optimum design process
- conventional design method steps (6)

Answer 3

1. collect data to describe system
2. estimate initial design
3. analyze system
4. check performance criteria
5. is it satisfactory –> yes –> stop
6. update design –> go back to step 3

Question 4

optimum design process
- optimum design method steps (7)

Answer 4

1. formulate the problem as an optimization problem
2. collect data
3. estimate initial design
4. analize system
5. check constraints
6. does it satisfy convergence criteria -> yes-> stop
7. update design -> go back to stop 3

Question 5

design constraint

Answer 5

limitations on conditions under which system is developed:

technical
economical
ergonomic
social impact
aesthetics
reliability

Question 6

design optimization formulation

Answer 6

1. identify a set of design variables
2. define the cost function f to be minimized
3. define constraint functions

Question 7

vector notation

Answer 7

Bold lower case

Question 8

matrix notation

Answer 8

Bold upper case

Question 9

length of a vector

Answer 9

||x||=(x1x2…)^1/2

Question 10

active constraint

Answer 10

g(x) = 0

Question 10

gradient function

Answer 10

delF= [df(x)/dx1 df(x)/dx2..]

Question 11

inactive constraint

Answer 11

g(x) < 0

Question 12

violated constraint

Answer 12

g(x) > 0

Question 13

discrete

Answer 13

when value must be selected form given values 1,2,3,4,