P13032Adjustable Sailing SeatTimothy Slattery - MEAndrey Sulik - MEDerek Topper - MEMarion Paredes Pages – ISE

May 10, 2013

Project Overview• Objective:

o Redesign team P12031's Motion Assistive Seating Device for Sailing (Keith Burhans)

Gold Medal Sailing SeatMotion Assistive Seating Device

Specifications• Primary customer needs:

o Provide adjustability for multiple userso Provide adjustability for other Sonar boatso Increase safetyo Increase mechanical advantageo Provide enough space for Jib Transfer Bench (P13031)

• Translated into engineering specifications

Engineering Specifications

1 = most important

EngineeringSpecification # Importance*1 Source Specification Unit of Measure Marginal Value Ideal Value

ES1 1 CN1, CN11 Secure to Sonar with non-permanent attachments Binary YesES2 1 CN2 Adjustable Foot Rests in 4<ES3 1 CN3 Seat Adjustment (up/down) in 1<ES4 1 CN4 Hand Crank Adjustment in 4<ES5 1 CN5 Percentage Amplification of User Force Input % 3rev/ 90° Tiller 4rev/ 90° Tiller

ES6 1 CN6 Corrosion resistance Binary YesES7 1 CN7 Seat locks into position anywhere in travel Binary YesES8 1 CN8 Cost of components manufactured for MSD $ 3000>

ES9 1 CN9 Entire 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> 1ES12 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 2 CN22 Grab handle(s) to assist seat movement Binary YesES15 2 CN17 Time required to attach or detach hands s 30< 15<ES16 2 CN18 System has limited number of sharp corners or edges # 10> 0ES17 2 CN19 Pinch points created by track platform # 2> 0ES18 2 CN20 Steps required to release from harness # 3> 1ES19 3 CN21 System fits multiple seats # 2≤ES20 2 CN11, CN21 Time to fit system in SONAR sailboat minutes 60> 30>ES21 2 CN11, CN21 Time to adjust system for new user minutes 60> 30>ES22 2 CN24 Time to assemble system minutes 60> 30>ES23 1 CN3 Seat Adjusetment (fore/aft) in 3<

Design: First Steps• Functional decomposition

Design: Concept• Concept development iterations • Two design proposals

o Redesigned trackless systemo Modified track system design (system constraints +

customer preference)• Primary improvement goals:

o Hand crank, seat position, and foot rest adjustabilityo Reduced impact on body when swinging from side to sideo Mounting plate that can secure different seat shellso Adjustable platform handle locks to lock in place in different

Sonar boatso Emergency quick-release system

Final System

Design: Adjustability• Anthropometric analysis to determine amount of adjustability

o Accommodate about 90% of the population• Adjustability:

Design Components• Hand Crank

Design Components• Pedestal Base

Design Components• Track Platform

Test ResultsEngineeringSpecification

#Importance

*1 SpecificationUnit of

MeasureMarginal

Value Ideal Value Test Results

ES1 1 Secure to Sonar with non-permanent attachments Binary Yes Yes

ES2 1 Adjustable Foot Rests in 4< 4"

ES3 1 Seat Adjustment (up/down) in 1< ~2.25"

ES4 1 Hand Crank Adjustment in 4< 4"

ES5 1 Percentage Amplification of User Force Input %3rev/ 90°

Tiller4rev/ 90°

Tiller4rev/ 90°

Tiller

ES6 1 Corrosion resistance Binary Yes Yes

ES7 1 Seat locks into position anywhere in travel Binary Yes Yes

ES8 1 Cost of components manufactured for MSD $ 3000> ~3500

ES9 1Entire seating system is moved aft from previous iteration in 0< 3< 3"

ES10 1Minimum FOS of critical elements found via analysis # 2≤ 3< 3

ES11 1 Steps required to release rudder in emergency # 3> 1 1

ES12 1Degree of movement of rudder from centerline of boat degrees 40< 90<

Specification Achieved

Specification Not Yet Verified

Test ResultsEngineeringSpecification

#Importance

*1 SpecificationUnit of

MeasureMarginal

Value Ideal Value Test Results

ES13 1 Backlash in lines controlling rudder in 1> 0.5>

ES14 2 Grab handle(s) to assist seat movement Binary Yes Yes

ES15 2 Time required to attach or detach hands s 30< 15< 0 sec.

ES16 2System has limited number of sharp corners or edges # 10> 0

ES17 2 Pinch points created by track platform # 2> 0 0

ES18 2 Steps required to release from harness # 3> 1 1

ES19 3 System fits multiple seats # 2≤

ES20 2 Time to fit system in SONAR sailboat minutes 60> 30> 15 min.

ES21 2 Time to adjust system for new user minutes 60> 30> 30 min.

ES22 2 Time to assemble system minutes 60> 30> 30 min.

ES23 1 Seat Adjusetment (fore/aft) in 3< 2"

Specification Achieved

Specification Not Yet Verified

Success and Failure• System provides full range of adjustability

o Foot rest angle (bonus!)• System provides greater comfort to user

o Corbeau seato 5 point harness

• Quick release tiller• System is expensive• System should be made more robust

o Removal of wooden componentso Foot rests

• Many parts to manufacture

Final System

Future Work• Provide adjustability for other popular sailing boats

o Ideal 18o Freedom 20

• Increase system portability• Provide ergonomic handcycling grips (30° tilt)• Decrease total installation time

Questions?