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Adjustable Universal Gold Medal Sailing Seat. Andrew Sulik Timothy Slattery Marion Paredes Pages Derek Topper Detailed Design Review 2/8/13, 3:30 pm. Agenda. Meeting Purpose Overview of Project Review Customer Needs & Eng. Specifications Review Decomposition of System Detailed Design - PowerPoint PPT Presentation
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ADJUSTABLE UNIVERSAL GOLD MEDAL SAILING SEATAndrew SulikTimothy SlatteryMarion Paredes PagesDerek Topper
Detailed Design Review2/8/13, 3:30 pm
Agenda• Meeting Purpose• Overview of Project• Review Customer Needs & Eng. Specifications• Review Decomposition of System• Detailed Design• Test Plan• Review Project Plan• Review Risk Assessment• Conclusions
2
Project Goals• Make system comfortable and adjustable to multiple users• Allow enough room for the use of a jib transfer bench• Increase and/or maintain the functionality already
available• Adapt for any C4-5 quadriplegic user such as Richard
Ramos on a 3 person Sonar keel boat that meets all IFDS regulations
3
Customer Needs Recap
*1=Most important
4
Customer Need #
Importance Level*1 Description Comments/Status
CN1 1 Designed specifically to fit SONAR sailboat CN2 1 Adjustable foot rests CN3 1 Seat Mobility (up/down) CN4 1 Hand crank Adjustability (up/down) CN5 1 Mechanical Advantage 6.4xCN6 1 Corrosion Resistance Powder CoatCN7 1 Seat Locking mechanism (2 Positions around arc) CN8 1 Cost $3,000 CN9 1 Allows space for jib transfer bench
CN10 1 Safe system to operate for long periods 4 years minimumCN11 1 Portable, non-permanent installation no damage to boatsCN12 1 Fits on 1 pallet to ship CN13 1 Emergency quick release for rudder control CN14 1 System Controls Rudder CN15 1 Crank Geometry fits multiple users Product for range of users, ie. Yacht clubCN16 2 System weight CN17 2 Better Functioning 'Fast Pin' system All fast pin locationsCN18 2 Crew Safety CN19 2 Enlarge Track Platform CN20 2 Improved harness CN21 2 Interchangeable seats CN22 3 Grab Handle at top of seat CN23 3 Fit to multiple boats CN24 3 Easy to assemble & install
Engineering Specs Recap
*1 For importance level 1 is must have, 2 is nice to have, 3 is preference only
5
EngineeringSpecification #
Importance*1 Source Specification
Unit of Measure Marginal Value Ideal Value Comment/Status
ES1 1 CN1, CN11 Secure to Sonar with non-permanent attachments Binary Yes ES2 1 CN2 Adjustable Foot Rests in 4< ES3 1 CN3 Seat Adjustment (up/down) in 3< ES4 1 CN4 Hand Crank Adjustment in 4<
ES5 1 CN5 Percentage Amplification of User Force Input % 3rev/ 90° Tiller4rev/ 90°
Tiller ES6 1 CN6 Corrosion resistance Binary Yes Material SelectionES7 1 CN7 Seat locks into position anywhere in travel Binary Yes ES8 1 CN8 Cost of components manufactured for MSD $ 3000>
ES9 1 CN9Entire seating system is moved aft from previous iteration in 0< 3<
ES10 1 CN10 Minimum FOS of critical elements found via analysis # 2≤ 3< ES11 1 CN13 Steps required to release rudder in emergency # 3> 1
ES12 1 CN14 Degree of movement of rudder from centerline of boat degrees 40< 90< ES13 1 CN14 Backlash in lines controlling rudder in 1> 0.5> ES14 1 CN15 Distance between hand attachment points in 18±2 18±0.5 ES15 2 CN22 Grab handle(s) to assist seat movement Binary Yes ES16 2 CN17 Time required to attach or detach hands s 30< 15<
ES17 2 CN18 System has limited number of sharp corners or edges # 10> 0 ES18 2 CN19 Pinch points created by track platform # 2> 0 ES19 2 CN20 Steps required to release from harness # 3> 1 ES20 3 CN21 System fits multiple seats # 2<
ES21 2 CN11, CN21Time to fit system in SONAR sailboat minutes 60> 30>
ES22 2 CN11, CN21Time to adjust system for new user minutes 60> 30> ES23 2 CN24 Time to assemble system minutes 60> 30> ES24 1 CN3 Seat Adjusetmenyt (fore/aft) in 3<
Functional Decomposition
6
Anthropometry
7
Ergonomics & Adjustability
• 95th Percentile Males – 5th Percentile Females• Accommodate 90% of the population
• Backrest• Proper back support• Minimum 10° rearward tilt ✓
• Handles/Hand Grips• Neutral wrist position• Interchangeable for C5 gloves and regular grips• 30° angle
8
30°
Adjustability – Detailed Design
9
• Considerations:• Distance from shoulders
• Shoulder-forward• Shoulder-down
• Distance from knees• Distance between legs• Rotation effects and distance
3 in
3 in
7 in
3 in
30º
Adjustability – Detail Design
10
• Crank Up/Down• Below shoulder• Accommodate user’s
preference
Adjustability – Detailed Design
11
• Seat Up/Down• Height• Comfort
• Seat Back/Forth• Distance from crank
• Foot Rests Up/Down• Leg length• Detachable
• Foot Rests Angle• Comfort/Disability
Material Selection• Selection criteria
• Good corrosion resistance• Good strength• Readily available• Easy to weld
• Ideal Material• Aluminum 6061-T6• Yield Strength 40 ksi• Tensile Ultimate 45 ksi• Young’s Modulus 10 ksi
12
Fastener Material Selection• Fastener Material
• 316 Stainless Steel• Limited Galvanic Corrosion• Cheap and readily available• Yield Strength 34 ksi• Tensile Ultimate 79 ksi
• Galvanic Corrosion• Reduced by material selection• Reduced by Delrin washers at all bolts
13
Seat & Footrest Adjustability
14
Hand Crank Adjustability
15
States of Loading• Worst Case (P12031)
• 170 lb applied horizontally to hand crank• 150 lb applied downward on collection barrel• 1349 lb impact force applied to end of track
16
Detailed Design-Track Platform• Similar to original design – ½” thick
marine fir• Aluminum L-beam (underneath)
adds support to track platform• Added 2 detachable pieces in the
front• Secured using dovetail tabs
• Drilled holes in plates on allow for the adjustment of handle locks
• Rubber plugs are used to eliminate sharp edges and corners on the handle locks
17
Track Platform Analysis
Max deflection = 0.1224 in
18
Track deflection with load
Max deflection = 0.2960 in
0 10 20 30 40-0.35
-0.3
-0.25
-0.2
-0.15
-0.1
-0.05
0
x(in)
W (i
n)
Beam Deflection
0 10 20 30 40-0.03
-0.02
-0.01
0
0.01
0.02
0.03
x(in)D
W
Beam Slope
0 10 20 30 40-1500
-1000
-500
0
500
1000
1500
x(in)
Mom
ent (
lb*in
)
Beam Bending Moment
0 10 20 30 40-150
-100
-50
0
50
100
150
200
x(in)
She
ar F
orce
(lb)
Beam Shear Force
0 10 20 30 40-4
-3
-2
-1
0
1
2
3
4
x(in)
Nor
mal
Stre
ss T
op (k
Psi
) Beam Maximum Tensile Stress
0 10 20 30 40-4
-3
-2
-1
0
1
2
3
4
x(in)
Nor
mal
Stre
ss B
otto
m (k
Psi
)
Beam Maximum Tensile Stress
Track Platform Analysis
• Stress on bolts during impact of 1349 lb (worst case. From P12031.)• Shear strength = 30000 psi• ¼”-20 aluminum bolts – Stainless Steel bolts to be used
•
•
19
Detailed Design-Pedestal Base• Clamping fixture same as
P12031
• Platform extended aft 3 in to accommodate Jib Transfer Bench
• Support Ribs contoured to boat deck
20
Detailed Design-Pedestal
21
• Swivel plate provides rotation and deceleration
• Pedestal will interface with swivel via welded plate or bolt pattern
• Maximum loading parameters determined by manufacturer
Pedestal Forces• MA=MB=2804.88 lb*in• RB=260 lb
• Specified at 750lb compression (Trendler)
• Specified moment of 9000 lb*in (Trendler)
22
13 in
Detailed Design-User Support• Seat support frame from
P12031
• Main support arm fixed to top of swivel plate
23
Main Support Arm• δyA = 0.29 in• M = 2804.88 (in*lbs)• σ = 7250.0 psi• σy for 6061-T6 Aluminum
is 45,000 psi.• FOS = 6.2
24
δ σ = 𝐹𝑂𝑆=𝜎 𝑦𝜎
Detailed Design-Hand Crank• Centered pulley system
allows individual barrels
• Telescoping tube allows vertical adjustment
• Center pivot allows space for user entry
• Adjustable tensioner allows for easy set up
25
Detailed Design-Crank Support Arms• Case 1 (worst case)
• Fa=170 lb• Mb=838.68 lbin/arm• σ=11981.14 psi/arm• σy=45 ksi (6061-T6)• FOS=3.76
26
σ = 𝐹𝑂𝑆=𝜎 𝑦𝜎
Detailed Design-Crank Support Arms• Case 2 (normal conditions)
• Fa=20 lb• Mb=98.76 lbin/arm• σ=1409.57 psi/arm• σy=45 ksi (6061-T6)• FOS=31.9
27
σ = 𝐹𝑂𝑆=𝜎 𝑦𝜎
Detailed Design-Rotation Pin• Since bearing cannot apply
moment, need pin to lock crank arm into place
• These calculations still need to be completed
28
Detailed Design-Hand Crank• Lower pulley axle• Aluminum 6061-T6• Yield strength:45000 psi
29
0 1 2 3 4 5 6-6
-5
-4
-3
-2
-1
0x 10
-3
x(in)
W (i
n)
Beam Deflection
0 1 2 3 4 5 6-2
-1
0
1
2
3
4
5x 10
-3
x(in)
DW
Beam Slope
0 1 2 3 4 5 60
20
40
60
80
100
120
x(in)
Mom
ent (
lb*in
)
Beam Bending Moment
0 1 2 3 4 5 6-100
-50
0
50
100
x(in)
She
ar F
orce
(lb)
Beam Shear Force
0 1 2 3 4 5 60
2
4
6
8
10
x(in)
Nor
mal
Stre
ss T
op (k
Psi
)
Beam Maximum Tensile Stress
0 1 2 3 4 5 6-10
-8
-6
-4
-2
0
x(in)
Nor
mal
Stre
ss B
otto
m (k
Psi
)
Beam Maximum Tensile Stress
Detailed Design-Hand Crank• Upper pulley axle• Same properties as before
30
Hand Crank Fatigue• From quadsailor.com, we found evidence of 3 hour trips• Assuming a 5 month season, 1 tack every 5 minutes, and
4 cranks per tack we get 8460 rev/season• Based on a life of 8 years you get a lifetime use of 69,120
revolutions• Due to this low number, fatigue analysis on these axles is
unnecessary
31
Hand Crank Gearing• Goal: 4 cranks for 90 degree tiller movement• Want to keep 4” load pulley• Based on current system, where 3 cranks give 90 degree
tiller movement, we have a 1.25 pulley ratio• To get 4 cranks, need pulley ratio of 0.9375• Requires 3.75” drive pulley – Not Readily Available• Using 1 pulley ratio need 3.75 cranks for 90 degree tiller
movement
32
Hand Crank Gearing• Options for gearing
1. Keep current gear ratio with 3 cranks per 90 degree tiller rotation
2. Use decreased gear ratio with 3.75 cranks per 90 degree tiller rotation
• Options to be given to Richard Ramos
33
Detailed Design-Hand Crank Grips• System designed to mimic
C5 grips
• Detent pin to keep hands in place
• Detent pin axial pull out force needs to be acquired
34
Bearing Specifications
Max Dynamic Load
2110 Lb
Max Static Load
966 Lb
Max Axial Load
966 Lb
• Sealed bearings to last in elements
• Able to withstand larger loads than applied
• Cheap to replace if needed
35
Tiller Strut• Same structure as P12031• Hasp fitting connection
removed• Replaced with clamp• Clamp geometry has not
been determined
36
Emergency Tiller Release• Cam cleat concept has not
been fully developed
• Requires testing of cam cleats (on Skip’s boat)
37
Preliminary Test Plan
38
• MSDII Test Plan
• See Excel Spread Sheet
Project Plan• MSDI final Project Plan
• See .pdf Files
• https://edge.rit.edu/edge/P13032/public/WorkingDocuments/Project%20Information/General%20Information/Project%20Plan%20/Project%20Plan%20MDSI%201_4.pdf
39
Risk Assessment• Overall assessment of risks
• See Excel Spreadsheet
40
Questions?
41