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P12031: Motion Assistive Seating Device for Sailing

Project Team:Steven GajewskiAleef MahmudMitchel RankieChristopher Sullivan

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Faculty Guide: Edward Hanzlik Technical Mentor: Kate Leipold Primary Customer: Richard Ramos Secondary Customer: Keith Burhans Sponsor: Mark Smith and M.E. Dept.

National Science Foundation

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Overview The goal of this project is to re-design, build, and

test a portable, detachable seating system that will allow disabled users to participate in IFDS competitive sailing. The system must utilize the user’s rotational arm motion to steer the boat’s rudder and allow adjustment of the user’s position by rotating along a bearing mounted track for leverage and view during sailing scenarios. The team must reduce excess weight, increase functionality, and adapt specifically for a C 4-5 quadriplegic user.

Project Description

Need # Importance DescriptionCN1 1 Designed to fit specifically in SONAR sailboatsCN2 1 Safe system to operate for long periodsCN3 1 System controls rudderCN4 1 Portable, non-permanent installation on boatCN5 1 Environmentally resistant to wearCN6 1 Shippable and fits on one paletteCN7 1 Emergency override for rudder controlCN8 1 Weight of system is primarily over the keelCN9 1 Crank Geometry (length of crank fits shoulder width)

CN10 1 25% weight reductionCN11 1 Ease of operation (biceps work required reduced)CN12 1 Easy to detach hands from crankCN13 2 Comfortable hand crank height (height of crank shaft)CN14 2 Re-work “chair swing” mechanics/mechanismCN15 2 Tilt in seat for better viewCN16 2 20% cost reduction in BOMCN17 3 Better fitting harnessCN18 3 Less abrasive harnessCN19 3 Easier entry for userCN20 3 Rearview mirror

Customer Needs

Engineering Specifications

Spec # Importance Source DescriptionES1 1 CN1, CN4 Secure to Sonar with non-permanent attachmentsES2 1 CN2 Minimum FOS of critical elements found via analysisES3 1 CN2 Time required to release user from seat and systemES4 1 CN3 Degree of movement of Rudder from centerline of boatES5 1 CN3 Backlash in the lines controlling the RudderES6 1 CN4, CN6 Cubic area of disassembled and packed unitES7 1 CN5 Corrosion resistanceES8 1 CN7 Functioning emergency overide for RudderES9 1 CN8 Location of Track Platform respective to Keel

ES10 1 CN9 Length of the distance between hand attachment pointsES11 1 CN10 Weight of each part combinedES14 1 CN11 Percentage of amplification of user's force inputES15 2 CN12 Time required to detach handsES16 2 CN13, CN18 User Specified HarnessES17 2 CN13, CN18 Comfort perceived by user from 1[low]-10[high]ES18 2 CN14 Height of crank shaft relative to the bottom of the seatES19 2 CN15 Clearence of tangle prone lines from chair swingingES12 3 CN16 Angle of tilt of chair relative to horizontal plane of deckES13 3 CN17 Cost of components purchased for design during MSDES21 3 CN19 Time required for entryES22 3 CN20 Functioning rearview mirror

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Functional Decomposition

User Device

Portability Attachabl

e

Non Permanen

t

Assembly Required

Major Parts

Tiller Strut Tiller Arm Track Platform

Passenger Interface

Seat Cranks

Pedestal Base

Tiller Control

OverrideRotate hand Crank

Ropes Taut

Shifting Weight

Ropes and Pulleys

Locking Mechanis

m

Restrain User

4-Point harness Hands Feet

Steering column

tilt

Boat

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System Interface

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Boat Constraints

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Pedestal Base

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Track Platform

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Tiller Strut

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Seat Support Rib

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Seat

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Crank Design

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Hand Crank Design

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Critical Objectives

Customer Need # Importance Description Status

CN1 1 Designed to fit specifically in SONAR sailboats PassCN2 1 Safe system to operate for long periods PassCN3 1 System controls rudder PassCN4 1 Portable, non-permanent installation on boats PassCN5 1 Environmentally resistant to wear PassCN6 1 Shippable and fits on one palette PassCN7 1 Emergency override for rudder control PassCN8 1 Weight of system is primarily over the keel PassCN9 1 Crank Geometry (length of crank fits shoulder width) PassCN10 1 25% weight reduction FailCN11 1 Ease of operation (biceps work required reduced) PassCN12 1 Easy to detach hands from crank Pass

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Secondary Objectives

Customer Need # Importance Description Status

CN13 2 Better fitting harness PassCN14 2 User Specific hand crank height (height of crank shaft) PassCN15 2 Address issue of lines tangling during chair swing PassCN16 2 Tilt in seat for better view PassCN17 3 Maximum cost of BOM cannot exceed $3000 PassCN18 3 Less abrasive harness PassCN19 3 Quick entry for user PassCN20 3 Rearview mirror Fail

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Test # Importance Test Item Source Unit Min. Value

Ideal Value

Actual Value

Pass/ Fail

T1.0 Weight and CostT1.1 1 Weight of each part combined lb 106> 79.5> 88 Pass

T1.2 3 Cost of components purchased $ 3000> 2400> 2800+ Pass

T2.0 User ComfortT2.1 1 Distance between hand attachment points in 18±2 18±.5 17 Pass

T2.2 2 Height of crank relative to the bottom of the seat in 18±2 18±.5 19 Pass

T2.3 2 User Specified Harness Binary Yes Yes Yes Pass

T2.4 2 Comfort perceived by user from 1[low]-10[high] # 5< 10 7 Pass

T3.0 InstallationT3.1 1 Cubic area of disassembled and packed unit in^3 74088> 66679> 37800 Pass

T3.2 1 Secure to Sonar with non-permanent attachments Binary Yes Yes Yes Pass

T3.3 3 Time required for entry minutes 60> 30> 11 Pass

Testing Results

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Test # Importance Test Item Source Unit Min. Value

Ideal Value

Actual Value

Pass/ Fail

T4.0 Normal Sailing ConditionsT4.1 1 Degree of movement of Rudder from centerline degrees 40< 90< 46.55 Pass

T4.2 1 Backlash in the lines controlling the Rudder in 1> 0.5> 1 Pass

T4.3 1 Location of Track Platform respective to Keel (x,y) in 0±15,0 0±10,0 13 Pass

T4.4 1 Percentage of amplification of user's force input % 0< 30< 50 Pass

T4.5 1 Time required to detach hands seconds 60> 30> 5 Pass

T4.6 2 Angle of tilt of chair relative to horizontal plane degrees 10< 15< 20.2 Pass

T4.7 3 Functioning rearview mirror Binary Yes Yes No Fail

T5.0 Rough Sailing and Worst Case ConditionsT5.1 1 Corrosion resistance Binary Yes Yes Yes Pass

T5.2 1 Minimum FOS of critical elements found via analysis # 1< 3< 3.09 Pass

T5.3 1 Time required to release user from seat and system minutes 10> 5> .42 Pass

T5.4 1 Functioning emergency override for Rudder Binary Yes Yes Yes Pass

T5.5 2 Clearance of tangle prone lines from chair swinging in 1< 4< 7 Pass

Testing Results

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In future iterations of the development: Further weight reduction Further cost reduction Powder coated to provide enhanced corrosion

protection Adjustable for a variety of user and the

constraints of the Sonar keelboat. Design for environment Design for assembly (DFA) Implement electronics and/or mechanically

actuated parts that allow the user greater control of the boat with minimal effort exerted

Future Work

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