adjustable universal gold medal sailing seat
DESCRIPTION
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 PresentationTRANSCRIPT
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ADJUSTABLE UNIVERSAL GOLD MEDAL SAILING SEATAndrew SulikTimothy SlatteryMarion Paredes PagesDerek Topper
Detailed Design Review2/8/13, 3:30 pm
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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
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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
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Customer Needs Recap
*1=Most important
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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
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Engineering Specs Recap
*1 For importance level 1 is must have, 2 is nice to have, 3 is preference only
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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<
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Functional Decomposition
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Anthropometry
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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
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30°
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Adjustability – Detailed Design
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• 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
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Adjustability – Detail Design
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• Crank Up/Down• Below shoulder• Accommodate user’s
preference
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Adjustability – Detailed Design
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• Seat Up/Down• Height• Comfort
• Seat Back/Forth• Distance from crank
• Foot Rests Up/Down• Leg length• Detachable
• Foot Rests Angle• Comfort/Disability
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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
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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
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Seat & Footrest Adjustability
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Hand Crank Adjustability
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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
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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
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Track Platform Analysis
Max deflection = 0.1224 in
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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
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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
•
•
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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
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Detailed Design-Pedestal
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• Swivel plate provides rotation and deceleration
• Pedestal will interface with swivel via welded plate or bolt pattern
• Maximum loading parameters determined by manufacturer
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Pedestal Forces• MA=MB=2804.88 lb*in• RB=260 lb
• Specified at 750lb compression (Trendler)
• Specified moment of 9000 lb*in (Trendler)
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13 in
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Detailed Design-User Support• Seat support frame from
P12031
• Main support arm fixed to top of swivel plate
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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
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δ σ = 𝐹𝑂𝑆=𝜎 𝑦𝜎
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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
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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
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σ = 𝐹𝑂𝑆=𝜎 𝑦𝜎
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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
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σ = 𝐹𝑂𝑆=𝜎 𝑦𝜎
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Detailed Design-Rotation Pin• Since bearing cannot apply
moment, need pin to lock crank arm into place
• These calculations still need to be completed
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Detailed Design-Hand Crank• Lower pulley axle• Aluminum 6061-T6• Yield strength:45000 psi
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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
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Detailed Design-Hand Crank• Upper pulley axle• Same properties as before
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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
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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
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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
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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
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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
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Tiller Strut• Same structure as P12031• Hasp fitting connection
removed• Replaced with clamp• Clamp geometry has not
been determined
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Emergency Tiller Release• Cam cleat concept has not
been fully developed
• Requires testing of cam cleats (on Skip’s boat)
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Preliminary Test Plan
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• MSDII Test Plan
• See Excel Spread Sheet
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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
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Risk Assessment• Overall assessment of risks
• See Excel Spreadsheet
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Questions?
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