Assigning weight to objectives

Objectives	Weights
Safety	9
Ease of use	7
Portability	5
Less power	6
Cost	6

PUGH chart

Design Objectives	Weights	Design 1	Design 2	Design 3	Design 4
Safety	9	-	+	+	+
Ease of use	7	-	-	+	+
Portability	5	+	-	+	+
Less power consumption	6	+	+	+	-
Cost	6	+	+	+	-
Score (+)		17	21	33	21
Score (-)		-16	-12	0	-12
Total		1	9	33	9

Selected Concept Design

Justification

Design No.	Objective	Score Allocated	Justification for the Score
1	Safety	-9	Magnetic locks may not provide strong structural integrity.
	Ease of Use	-7	Camera-based detection can be complex to operate.
	Portability	5	Acrylic sheets make the design lightweight and easy to transport.
	Less Power Usage	6	Li-ion batteries are efficient and optimize energy usage.
	Cost	6	Cameras, batteries may increase the expenses.
2	Safety	9	Gears and mechanical structures provide stability but introduce minor risks.
	Ease of Use	-7	Complexity of gears and lifts makes the design harder to operate.
	Portability	-5	It is bulkier because of multiple gears, scissor lift reduces portability.
	Less Power Usage	6	Efficient gear drive mechanism reduces power consumption.
	Cost	6	Slightly expensive but remains reasonable.
3	Safety	9	Servo motors provide controlled movement minimizing mechanical hazards.
	Ease of Use	7	Ultrasonic sensors improve precision and ease of operation.
	Portability	5	Lightweight acrylic sheets ensure easy handling and transportability.
	Less Power Usage	6	Li-ion batteries optimize energy efficiency and performance.
	Cost	6	Design is cost-effective as servo motors and ultrasonic sensors are affordable.
4	Safety	9	Foam sheets provide soft edges enhancing safety.
	Ease of Use	7	The control is futuristic but requires learning, making it moderately easy to use.
	Portability	5	Foam sheets are lightweight, so portability is efficient.
	Less Power Usage	-6	Wireless charging is less efficient.
	Cost	-6	Spring-loaded joints increase overall costs.