Design Project Final Presentation

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Final presentation for a mechanical engineering design project which considers the creation of a product to evenly distribute passengers along subway / train platforms. Useful for undergraduate engineering design students. Own work.

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<ul><li><p>Sissi Wang, Jennifer Wong, Song Yang </p></li><li><p> Problem Lead users User needs Existing solutions Concept generation Concept evaluation Final design Limitations </p></li><li><p> Passengers congregate near entrances/exits on subway platforms during high trac </p><p> Areas of high density cause increased train boarding times </p></li><li><p> Lead users: Law enforcement Military Daily TTC commuters </p><p> Law enforcement and military extreme cases of crowd control </p><p> Daily TTC commuters encounters crowding more often than general population </p></li><li><p> A focus group was used to identify the needs of frequent TTC commuters </p><p> 3 major user needs identied: Eectiveness </p><p> Time for all passengers to board the train Comfort </p><p> Minimum distance between user and others Amount of sensory discomfort </p><p> Accessibility Amount of clearance available </p></li><li><p> Physical barriers Eective control, poor accessibility </p><p> Signage and announcements Not eective since passive </p><p> Law enforcement equipment (high-frequency audio, concentrated heat) Eective control, but harmful </p></li><li><p> Change the texture of the oor near entrances/exits, making it less desirable to stand on </p></li><li><p> Base case: LCD signs (animation and text) </p><p> Substitute Substitute vision with other senses, then... </p><p> Magnify Increase intensity: Visual Strobe lights Aural Directed impulse signals Temperature Directed heat lamps at entrances/exits </p></li><li><p> 15) Principle of Dynamism: </p><p> See-saw platform: takes advantage of peoples preference for at, balanced surfaces </p></li><li><p> 1. open: Sodium channels open when the Na + concentration is much higher outside than inside </p><p>One-way turnstiles </p></li><li><p> 2. "spread": Microscopic channels which traverse cell walls, enabling transport. Discretized platform </p></li><li><p>Criteria A B C D E F Row Total Weights </p><p>A) Accessibility - 0 1 0 1 0 2 0.13 </p><p>B) Eectiveness 1 - 1 0 1 1 4 0.27 </p><p>C) Comfort 0 0 - 0 1 1 2 0.13 </p><p>D) Cost 1 1 0 - 1 1 4 0.27 </p><p>E) Durability 0 1 0 0 - 1 2 0.13 </p><p>F) Adaptability 1 0 0 0 0 - 1 0.07 </p><p>TOTAL 15 1 </p></li><li><p>Textured Floor </p><p>Aggressive solutions </p><p>See-saw platform Turnstiles </p><p>Discretized platform </p><p>Criteria Rating </p><p>A) Accessibility 0.26 0.26 0.26 0.13 0.26 </p><p>B) Eectiveness </p><p>0.27 0.81 0.54 0.81 0.54 </p><p>C) Comfort 0.26 0.13 0.13 0.26 0.39 </p><p>D) Cost 0.81 0.27 0.27 0.54 0.81 </p><p>E) Durability 0.39 0.39 0.26 0.39 0.26 </p><p>F) Adaptability 0.21 0.14 0.14 0.21 0.21 </p><p>TOTAL 2.2 2 1.6 2.34 2.47 </p></li><li><p>Criteria Std Textured oor </p><p>Aggressive solutions </p><p>See-saw platform </p><p>Turnstiles Discretized platform </p><p>Accessibility - 0 - 0 0 </p><p>Eectiveness + + + + + </p><p>Comfort - - - 0 0 </p><p>Cost 0 - - - - </p><p>Durability 0 0 0 + 0 </p><p>Adaptability 0 0 0 0 0 </p><p>Sum (+) 1 1 1 2 1 </p><p>Sum (-) 2 2 3 1 1 </p><p>Sum (0) 3 3 2 3 4 </p><p>TOTAL -1 -1 -2 +1 0 </p><p>Standard: TTC signage/PA broadcasts </p></li><li><p>Concepts Weighted Decision Matrix Pugh Chart </p><p>Textured oor 2.2 -1 </p><p>Aggressive solutions 2 -1 </p><p>See-saw platform 1.6 -2 </p><p>Turnstiles 2.34 +1 </p><p>Discretized platform 2.47 0 </p><p> Discretized platform and turnstiles Ranked high in eectiveness and cost </p><p> Aggressive solutions and see-saw platform Ranked low in cost and comfort </p></li><li><p>Objectives: Adjustable length Easy to move around </p></li><li><p> Along platform edge: secure with vice Along platform surface: secure with suction (vacuum) lock </p><p> Secure panels with torx security screws </p></li><li><p>Cross-sectional view Side view </p><p>1 m 1 m </p><p>3 m 0.06 m </p><p>Material: Aluminum Total mass: 113.4 kg Material cost: $219.54 </p></li><li><p> Advantages over existing solutions: </p><p> Provides more accessibility than current physical barriers </p><p> Less intrusive and harmful than law enforcement equipment </p></li><li><p> Product potential: </p><p> Applications beyond TTC platforms due to Adjustable length Ability to be secured onto any protruding edge </p><p> Low material cost </p><p> Easy to implement </p></li><li><p> Limitations: Users can fail to follow instructions Cannot see where empty sections are </p><p> Possible improvements: Use with LCD screens Include grooves/rollers at the base of each panel to reduce friction during extension </p></li><li><p> Pugh Chart Pairwise comparisons to determine objective weights may fail due to inconsistent logic </p><p> Assumption that every objective is equally important </p><p> Weighted decision matrix Scoring system was a 3-point scale, could have ner granularity given more information </p></li><li><p>Textured Floor Aggressive solutions </p><p>Criteria Weight Factor Score Rating Score Rating </p><p>A) Accessibility 0.13 2 0.26 2 0.26 </p><p>B) Eectiveness 0.27 1 0.27 3 0.81 </p><p>C) Comfort 0.13 2 0.26 1 0.13 </p><p>D) Cost 0.27 3 0.81 1 0.27 </p><p>E) Durability 0.13 3 0.39 3 0.39 </p><p>F) Adaptability 0.07 3 0.21 2 0.14 </p><p>TOTAL 1 2.2 2 </p><p>1 = Poor, 2 = Fair, 3 = Good </p></li><li><p>See-saw platform Turnstiles </p><p>Criteria Weight Factor Score Rating Score Rating </p><p>A) Accessibility 0.13 2 0.26 1 0.13 </p><p>B) Eectiveness 0.27 2 0.54 3 0.81 </p><p>C) Comfort 0.13 1 0.13 2 0.26 </p><p>D) Cost 0.27 1 0.27 2 0.54 </p><p>E) Durability 0.13 2 0.26 3 0.39 </p><p>F) Adaptability 0.07 2 0.14 3 0.21 </p><p>TOTAL 1 1.6 2.34 </p><p>1 = Poor, 2 = Fair, 3 = Good </p></li><li><p>Discretized platform </p><p>Criteria Weight Factor Score Rating </p><p>A) Accessibility 0.13 2 0.26 </p><p>B) Eectiveness 0.27 2 0.54 </p><p>C) Comfort 0.13 3 0.39 </p><p>D) Cost 0.27 3 0.81 </p><p>E) Durability 0.13 2 0.26 </p><p>F) Adaptability 0.07 3 0.21 </p><p>TOTAL 1 2.47 </p><p>1 = Poor, 2 = Fair, 3 = Good </p></li></ul>