PUGH CHART

Pugh Chart — Concept Evaluation

Design Objectives	Weight	Design 1	Design 2	Design 3	Design 4	Design 5
Safety	9	+	Datum	0	+	0
Ease of Use	8	+	Datum	0	+	-
Cost	6	+	Datum	+	0	-
Compactness	5	+	Datum	-	+	0
Use of Standard Parts	7	+	Datum	+	+	0
Score (+)		5	0	2	3	0
Score (-)		0	0	1	0	2
Total		5	0	1	3	-2

5.1 Justifications for scores given

Design Number	Objective	Score Allotted	Justification for Score
1	Safety	+	Controlled grain movement and automated operation reduce direct manual handling.
	Ease of Use	+	Simple continuous flow from feeding to detection and segregation makes operation easy.
	Cost	+	Uses commonly available components such as ESP32, camera, conveyor and motors.
	Compactness	+	Components can be arranged in a compact conveyor-based structure.
	Use of Standard Parts	+	Uses readily available and replaceable mechanical and electronic components.
2	Safety	-	Air blower and exposed moving parts require additional safety precautions.
	Ease of Use	0	Hopper and adjustable gate are simple, but the blower requires adjustment.
	Cost	+	Uses relatively simple mechanical components and standard parts.
	Compactness	-	Blower and separation screen require additional space.
	Use of Standard Parts	+	Mainly uses commonly available mechanical and electrical components.
3	Safety	0	Simple mechanism provides moderate safety during operation.
	Ease of Use	0	Inclined screen and blower are straightforward but require proper adjustment.
	Cost	+	Uses simple and easily available components.
	Compactness	-	Inclined screen and blower arrangement requires more space.
	Use of Standard Parts	+	Uses standard mechanical components that are easily available.
4	Safety	+	Automated servo-controlled flaps reduce the need for manual intervention.
	Ease of Use	+	Vibrating feeding and automatic flap operation simplify segregation.
	Cost	0	Requires additional components such as vibrating feeder and servo mechanisms.
	Compactness	+	Components can be integrated into a relatively compact structure.
	Use of Standard Parts	+	Uses standard motors, servo motors and commonly available parts.
5	Safety	0	Automated operation improves safety, but the ejection mechanism requires precautions.
	Ease of Use	-	Pneumatic/solenoid-based ejection makes the system more complex.
	Cost	-	Additional pneumatic/solenoid components increase overall cost.
	Compactness	0	Conveyor and camera system is compact, but the ejection mechanism needs extra space.
	Use of Standard Parts	0	Uses standard components, but the ejection system may require specialized parts.

5.2 Selected Design

5.3 PRODUCT ARCHITECTURE

Product Architecture of Grain Segregation Machine

The product architecture shows how the major functions of the grain segregation machine are connected with its physical components

Functional Element	Physical Component
Grain Feeding	Hopper
Flow Rate Control	Adjustable Gate
Mechanical Separation	Vibrating Mesh
Grain Transportation	Conveyor Belt
Grain Segregation	Segregation Flap
Good Grain Collection	Collection Container
Impurity Collection	Separate Collection Container
Power Supply	DC Power Supply
Structural Support	Machine Frame

5.4 FUNCTION CLUSTERING

5.5 SUBSYSTEM LIST

Sl. No.	Subsystem
1	Feeding Subsystem
2	Transporting Subsystem
3	Segregation Subsystem

INTERACTION BETWEEN SUBSYSTEMS

FEEDING SUBSYSTEM

Interaction Type	Feeding Subsystem	Transporting Subsystem	Segregation Subsystem
Spatial	✓	✓	✓
Data	✓	✓	✓
Material	✓	✓	✓

CONVEYING SUBSYSTEM

Interaction Type	Feeding Subsystem	Transporting Subsystem	Segregation Subsystem
Spatial	✓	✓	✓
Data		✓	✓
Material	✓	✓	✓

SEGREGATION SUBSYSTEM

Interaction Type	Feeding Subsystem	Transporting Subsystem	Segregation Subsystem
Spatial	✓	✓	✓
Data		✓	✓
Material	✓	✓	✓