PUGH CHART

Design Objectives	Weights	Design 1	Design 2	Design 3	Design 4
Capacity to climb	10	DATUM	++	-	--
Power backup	5	DATUM	+	+	++
Safety	6	DATUM	+	--	--
Use of standard parts	7	DATUM	++	-	--
Obstacle detection	1	DATUM	+	+	--
cost	3	DATUM	++	+	--
Score(+)		0	52	9	10
Score(-)		0	0	-29	-44
Total		0	52	-20	-34

5.1 JUSTIFICATIONS FOR SCORE GIVEN

design no.	objective	score allocated	justification for the score
1	capacity to climb	0	datum
	power backup	0	datum
	safety	0	datum
	use of standard parts	0	datum
	obstacle detection	0	datum
	cost	0	datum
2	capacity to climb	20	It has good capacity to climb the steps
	power backup	5	There is good power backup for this design
	safety	6	This is more safer than the datum
	use of standard parts	14	no of parts are less and easy to use
	obstacle detection	1	have good obstacle detection
	cost	6	costs less than datum
3	capacity to climb	-10	Have no good capacity to climb than datum
	power backup	5	have power backup but not good as the datum
	safety	-12	not safer than datum
	use of standard parts	1	no specified parts used
	obstacle detection	-7	doesnt detect obstacles properly
	cost	3	cost is less than datum
4	capacity to climb	-20	very poor capacity to climb
	power backup	-2	have good power backup
	safety	-12	not safer than datum
	use of standard parts	-14	number of parts required than datum
	obstacle detection	-2	poor capacity to detect the obstacles
	cost	-6	highly expensive

5.2 SELECTED DESIGN

Tri wheel mechanism

5.3 PRODUCT ARCHITECTURE

Subsystem list

SL.NO	Subsystem
1	Climbing unit
2	indication unit
3	detection unit

5.4 FUNCTION CLUSTERING

5.5 INTERACTION BETWEEN SUBSYSTEMS

climbing unit	indication unit	detection unit
spatial	-	-
data	✔	✔
material	-	-

indication unit	climbing unit	detection unit
spatial	✔	-
data	-	✔
material	-	-

detection unit	climbing unit	indication unit
spatial	-	-
data	-	✔
material	✔	-