5. Concept evaluation and Product Architecture - Q-div-Engg-Exploration-2026-27-Odd/Repo-2 GitHub Wiki

PUGH CHART

PUGH CHART

Design Objectives Weights Design 1 Design 2 Design 3 Design 4 Design 5
Safety 9 + ++ + + Datum
Ease of use 7 ++ + - + Datum
Portability 5 + + + - Datum
Use of standards 6 - ++ + ++ Datum
Cost 6 ++ - + -- Datum
Score(+)   40 42 26 28 0
Score (-)   6 6 7 11 0
Total   34 36 19 17 0

5.1 Justifications for score given

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  Task 3 : Justification for the scores given
  Design No. Objective Score Allocated Justification for the Score  
  1 Safety 9 The inclusion of stable leg structures and integrated protective housings for electrical components reduces hazards during operation, making it safer than the baseline Datum design.  
  Ease of use 14 Simple integrated user controls (ON/OFF switch) and flexible thin-film solar charging make deployment and daily operation highly intuitive and straightforward.  
  portability 5 Uses lightweight flexible thin-film solar panels and a compact frame structure, improving carrying capability over the Datum.  
  use of standards -6 Relies on custom-fabricated leg mechanisms and specialized mounting frames rather than standard, readily available off-the-shelf structural components.  
  cost 12 Thin-film solar panel integration and simplified DC motor components lower overall fabrication and material costs significantly compared to the Datum.  
  2 Safety 18 Features a fully enclosed robust housing and stable support base that minimizes exposed moving parts and thermal or electrical exposure hazards.  
  Ease of use 7 Clear layout and ergonomic assembly facilitate easy handling, though slightly more complex to setup than Design 1.  
  portability 5 Self-contained module makes transport convenient, though slightly heavier due to reinforced structural components.  
  use of standards 12 Extensively uses standardized hardware, fasteners, and stock mechanical fittings, ensuring ease of replacement and maintenance.  
  cost -6 Additional structural reinforcement and heavy-duty casing increase initial material and manufacturing costs relative to the datum  
  3 Safety 9 Provides adequate enclosure for mechanical drive elements, offering better operator protection than the Datum baseline.  
  Ease of use -7 Complex internal mechanical linkages and less intuitive setup make operation and adjustments more difficult for end users.  
  portability 5 Relatively compact overall size allows decent mobility compared to the heavier Datum setup.  
  use of standards 6 Utilizes standard rotational joints and off-the-shelf drive gears.  
  cost 6 Moderate material requirements and standard hardware keep overall manufacturing expenses low.  
  4 Safety 9 Sturdy base frame provides good structural stability and safe operational clearance during movement.  
  Ease of use 7 Straightforward mechanical configuration allows basic operation with minimal training required  
  portability -5 Bulkier structural footprint and heavier mounting assembly make transport and repositioning significantly harder than the Datum.  
  use of standards 12 Constructed almost entirely from standard modular framing, stock brackets, and off-the-shelf commercial components.  
  cost -12 Multi-piece heavy structural frame and additional machined parts result in the highest manufacturing and assembly cost among all options.  
  5 Safety DATUM Serves as the reference baseline design against which all other designs are evaluated for user safety and operational hazards.  
  Ease of use DATUM Serves as the benchmark standard for user interaction, setup, and ease of handling  
  portability DATUM Establishes the baseline reference weight, dimensions, and ease of transport for the evaluation.  
  use of standards DATUM Serves as the baseline standard level for off-the-shelf component utilization and modularity.  
  cost DATUM Serves as the reference cost baseline (neutral benchmark) against which relative manufacturing and material costs are measured.  
           
           
           

5.2 Selected Design

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5.3 Product Architecture

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5.4 Function clustering

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5.5 Interaction between Subsytem

5.5 INTERACTION BETWEEN SUBSYSTEMS

SUBSYSTEM LIST

Sl. No. Subsystem
1 Movement Unit (Locomotion)
2 Control & Power Unit
3 Drawing Unit (Pen Mechanism)
4 Interface/Support Unit

1. Interaction between Subsystem 1 and Subsystem 2

Type Subsystem 1 Subsystem 2 Interaction Details
Spatial Yes Yes The control unit sends movement commands to the motors.
Data No Yes The control unit processes speed and direction commands for movement
Material Yes Yes The movement unit carries the Scribble Bot along the drawing path.

2. Interaction between Subsystem 2 and Subsystem 3

Type Subsystem 2 Subsystem 3 Interaction Details
Spatial Yes Yes The control unit sends commands to raise and lower the pen.
Data Yes Yes The control unit provides drawing instructions to the drawing unit.
Material No Yes The drawing unit holds the pen and maintains contact with the drawing surface.

3. Interaction between Subsystem 1 and Subsystem 3

Type Subsystem 1 Subsystem 3 Interaction Details
Spatial Yes Yes The movement unit moves the robot while the drawing unit positions the pen.
Data Yes Yes Movement and drawing commands are coordinated to create the required pattern.
Material Yes Yes The movement unit carries the pen mechanism along the drawing path.

4. Interaction between Subsystem 2 and Subsystem 4

Type Subsystem 2 Subsystem 4 Interaction Details
Spatial Yes Yes The interface provides access to start/stop and mode selection controls.
Data Yes Yes The interface sends user commands to the control unit and receives status information.
Material No No No direct material transfer occurs between these units.

5. Interaction between Subsystem 1 and Subsystem 4

Type Subsystem 1 Subsystem 4 Interaction Details
Spatial Yes Yes The chassis supports the movement unit and provides space for the interface.
Data No No No direct data exchange occurs between these units.
Material Yes Yes The chassis supports the motors, wheels and other components.

6. Interaction between Subsystem 3 and Subsystem 4

Type Subsystem 3 Subsystem 4 Interaction Details
Spatial Yes Yes The pen holder and chassis provide support for the drawing mechanism.
Data No No No direct data exchange occurs between these units.
Material Yes Yes The pen holder secures the pen, while the frame supports the mechanism.
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