CONCEPT SELECTION AND PRODUCT ARCHITECTURE

OBJECTIVES	WEIGHTAGE
AUTOMATIC	9
USER FRIENDLY	8
RUGGED	6
PORTABILITY	5

PUGH CHART

OBJECTIVES	DESIGN 1	DESIGN 2	DESIGN 3	DESIGN 4	DESIGN 5
AUTOMATIC	0	0	DATUM	0	0
USER FRIENDLY	+	0	DATUM	-	-
RUGGED	0	0	DATUM	0	0
POTABILITY	+	-	DATUM	0	-
SCORE +	13	0	0	0	0
SCORE -	0	-5	0	-8	-13
TOTAL	18	-5	0	-8	-13

JUSTIFICATIONS

DESIGN IDEAL NO.	OBJECTIVE	SCORE GIVEN	JUSTIFICATION
1	AUTOMATIC	0	ALL CONCEPTS ARE AUTOMATIC
	USER FRIENDLY	8	SIMPLE MECHANISM
	RUGGED	0	ALL CONCEPTS INCLUDE CHARGEABLE BATTERY
	PORTABILITY	5	LIGHT MATERIALS USED
2	AUTOMATIC	0	ALL CONCEPTS ARE AUTOMATIC
	USER FRIENDLY	0	COMPLICATED MECHANISM
	RUGGED	0	ALL CONCEPTS INCLUDE CHARGEABLE BATTERY
	PORTABILITY	-5	TOO MANY ITEMS USED
3	AUTOMATIC	0
	USER FRIENDLY	0
	RUGGED	0
	PORTABILITY	0
4	AUTOMATIC	0	ALL CONCEPTS ARE AUTOMATIC
	USER FRIENDLY	-8	BECAUSE OF ITS COMPLEXITY
	RUGGED	0	ALL CONCEPTS INCLUDE CHARGEABLE BATTERY
	PORTABILITY	0	NUMEROUS COMPONENTS
5	AUTOMATIC	0	ALL CONCEPTS ARE AUTOMATIC
	USER FRIENDLY	-8	DUE TO HEAVY CHAINS
	RUGGED	0	ALL CONCEPTS INCLUDE CHARGEABLE BATTERY
	PORTABILITY	-5	USE OF ATTACHED ROLLERS

SELECTED DESIGN

CLUSTERING OF SUB-FUNCTIONS AND FUNCTIONS INTO SUB SYSTEM IN GLASS BOX/FUNCTION TREE

	Sub systems
1	User input
2	Authentication
3	Working
4	output

System interaction details

Material interaction: solids, liquids, and gases that flow from one subsystem to next.

Energy interaction: energy that must be transmitted or shielded between subsystems.

Data interactions: signals (tactile, acoustic, electrical, visual, etc.) that must be processed from one subsystem to next.

Spatial interactions: geometrical dimensions, degrees of freedom, tolerances and constraints that must be maintained between the subsystems.

User input

Interactions	authentication	working	output
Energy interactions	yes	yes	yes
Data interactions	yes	no	yes
Material interaction	no	yes	no
Spatial interactions	yes	yes	yes

There is energy interaction with all other sub systems (transmission of power). Data from user input is transferred to authentication system and the output system. There is material interaction with the working sub system, the liquid filled in the container is used by the spray. Spatial interaction exists between all sub systems.

Authentication

interactions	user input	working	output
energy interactions	yes	no	no
data interactions	yes	yes	no
Material interactions	no	no	no
Spatial interactions	yes	yes	yes

The system is data interactive with user input system and the working system. Material interactions do not exist with any systems. All sub systems are spatially interactive.

Working

interactions	user input	authentication	output
Energy interaction	yes	no	no
data interaction	yes	yes	yes
Material interaction	yes	no	no
Spatial interaction	yes	yes	yes

Energy interaction exists with only the user input. Data interactions exist with all other subsystems for better functioning of the model. There is material interaction with the user input sub system. Spatial interaction exists with all other sub systems.

Output

interactions	user input	authentication	working
Energy interactions	yes	no	no
data interactions	yes	no	yes
Material interactions	no	no	no
Spatial interactions	yes	yes	yes

The output sub system does not have energy interaction with other sub systems however data interactions exist with user input and the working sub system. Material interactions do not exist. Spatial interaction exist with all other sub systems.

COMPONENT HIERARCHY