5.CONCEPT EVALUATION AND PRODUCT ARCHITECTURE - Y-div-Engg-Exploration-2026-27-Odd/Repo-02 GitHub Wiki

Write Pugh chart for the 4 alternative designs of the Shoe Polishing Machine

Design Objectives Weights Design 1 (Datum) Design 2 Design 3 Design 4
Safety / Ergonomics 9 Datum + -- --
Ease of Use 7 Datum + - +
Portability / Size 5 Datum - + +
Use of Standard Parts 6 Datum 0 + +
Manufacturing Cost 6 Datum - + +
Score (+) 16 17 24
Score (-) 11 -25 18
Total 33 0 9 -8 6

5.1 Justifications for Score Given

Design No. Objective Score Allocated Justification for the Score
1 Safety Datum Use as the reference for comparing other designs
Ease of use Datum Provides the baseline for operating effort
Portability Datum Used as the standard for comparing portabilit
Use of standard parts Datum Serves as the reference for common components
Cost Datum Used as the baseline for cost comparison
2 Safety 9 The enclosed chassis and regulated servo sweep path reduce pinch hazards
Ease of use 0 Automated/regulated sweep mechanism makes polishing easier with minimal effort
Portability 5 Additional servo motors and enclosed chassis slightly increase bulky size
Use of standard parts 6 Uses a mix of standard off-the-shelf components and custom brackets
Cost 12 Servo motors and electronics increase overall component and assembly cost
3 Safety -18 High risk of pinch points and injury due to exposed moving mechanisms
Ease of use -7 Requires significant manual effort and handling to operate
Portability -5 Design No.
:--- :--- :---: :---
1 Safety Datum Use as the reference for comparing other designs
Ease of use Datum Provides the baseline for operating effort
Portability Datum Used as the standard for comparing portabilit
Use of standard parts Datum Serves as the reference for common components
Cost Datum Used as the baseline for cost comparison
2 Safety 9 The enclosed chassis and regulated servo sweep path reduce pinch hazards
Ease of use 0 Automated/regulated sweep mechanism makes polishing easier with minimal effort
Portability 5 Additional servo motors and enclosed chassis slightly increase bulky size
Use of standard parts 6 Uses a mix of standard off-the-shelf components and custom brackets
Cost 12 Servo motors and electronics increase overall component and assembly cost
3 Safety - Compact overall layout and lightweight frame structure
Use of standard parts -6 Built largely using readily available standard parts and raw materials
Cost -6 Simple mechanism significantly lowers production and material costs
4 Safety 9 Exposed drive components create pinch and safety hazards during operation
Ease of use -7 Convenient operation mechanism requires moderate user interaction
Portability 10 Optimized compact dimensions allow easy transport
Use of standard parts 6 Utilizes standard stock components and basic assembly parts
Cost Baseline Simple drive arrangement reduces manufacturing complexity and cocost

5.2 Selected Design: Design 2 (Triangulated Servo Brushes)

  • Highest Overall Weighted Total: Achieved the highest net score of +9 among all evaluated concepts.
  • Enhanced Ergonomics & Safety: The enclosed chassis and regulated servo sweep path reduce pinch hazards and polish splatter.
  • Optimal Mechanism: Features dual triangulated brushes and a multi-channel polish dispenser to clean varied shoe sizes efficiently.

5.3 Product Architecture

5.4 Function Clustering

5.5 Interaction Between Subsystems