P12031: Motion Assistive Seating Device for Sailing Project Team: Steven Gajewski Aleef Mahmud Mitchel Rankie Christopher Sullivan 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 MSD - P12031 1
Project Description 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. MSD - P12031 2
Customer Needs Need # Importance Description CN1 1 Designed to fit specifically in SONAR sailboats CN2 1 Safe system to operate for long periods CN3 1 System controls rudder CN4 1 Portable, non-permanent installation on boat CN5 1 Environmentally resistant to wear CN6 1 Shippable and fits on one palette CN7 1 Emergency override for rudder control CN8 1 Weight of system is primarily over the keel CN9 1 Crank Geometry (length of crank fits shoulder width) CN10 1 25% weight reduction CN11 1 Ease of operation (biceps work required reduced) CN12 1 Easy to detach hands from crank CN13 2 Comfortable hand crank height (height of crank shaft) CN14 2 Re-work chair swing mechanics/mechanism CN15 2 Tilt in seat for better view CN16 2 20% cost reduction in BOM CN17 3 Better fitting harness CN18 3 Less abrasive harness CN19 3 Easier entry for user CN20 3 Rearview mirror
Engineering Specifications Spec # Importance Source Description ES1 1 CN1, CN4 Secure to Sonar with non-permanent attachments ES2 1 CN2 Minimum FOS of critical elements found via analysis ES3 1 CN2 Time required to release user from seat and system ES4 1 CN3 Degree of movement of Rudder from centerline of boat ES5 1 CN3 Backlash in the lines controlling the Rudder ES6 1 CN4, CN6 Cubic area of disassembled and packed unit ES7 1 CN5 Corrosion resistance ES8 1 CN7 Functioning emergency overide for Rudder ES9 1 CN8 Location of Track Platform respective to Keel ES10 1 CN9 Length of the distance between hand attachment points ES11 1 CN10 Weight of each part combined ES14 1 CN11 Percentage of amplification of user's force input ES15 2 CN12 Time required to detach hands ES16 2 CN13, CN18 User Specified Harness ES17 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 seat ES19 2 CN15 Clearence of tangle prone lines from chair swinging ES12 3 CN16 Angle of tilt of chair relative to horizontal plane of deck ES13 3 CN17 Cost of components purchased for design during MSD ES21 3 CN19 Time required for entry ES22 3 CN20 Functioning rearview mirror
Functional Decomposition User Device Boat Portability Attachable Tiller Control Shifting Weight Non Permanent Assembly Required Override Rotate hand Crank Ropes and Pulleys Locking Mechanism Restrain User Major Parts Ropes Taut 4-Point harness Hands Feet Steering column tilt Tiller Strut Tiller Arm Track Platform Passenger Interface Pedestal Base Seat Cranks MSD - P12031 5
System Interface MSD - P12031 6
Boat Constraints MSD - P12031 7
Pedestal Base MSD - P12031 8
Track Platform MSD - P12031 9
Tiller Strut MSD - P12031 10
Seat Support Rib MSD - P12031 11
Seat MSD - P12031 12
Crank Design MSD - P12031 13
Hand Crank Design MSD - P12031 14
Critical Objectives Customer Need # Importance Description Status CN1 1 Designed to fit specifically in SONAR sailboats Pass CN2 1 Safe system to operate for long periods Pass CN3 1 System controls rudder Pass CN4 1 Portable, non-permanent installation on boats Pass CN5 1 Environmentally resistant to wear Pass CN6 1 Shippable and fits on one palette Pass CN7 1 Emergency override for rudder control Pass CN8 1 Weight of system is primarily over the keel Pass CN9 1 Crank Geometry (length of crank fits shoulder width) Pass CN10 1 25% weight reduction Fail CN11 1 Ease of operation (biceps work required reduced) Pass CN12 1 Easy to detach hands from crank Pass MSD - P12031 15
Secondary Objectives Customer Need # Importance Description Status CN13 2 Better fitting harness Pass CN14 2 User Specific hand crank height (height of crank shaft) Pass CN15 2 Address issue of lines tangling during chair swing Pass CN16 2 Tilt in seat for better view Pass CN17 3 Maximum cost of BOM cannot exceed $3000 Pass CN18 3 Less abrasive harness Pass CN19 3 Quick entry for user Pass CN20 3 Rearview mirror Fail MSD - P12031 16
Testing Results Test # Importance Test Item Source Unit T1.0 Weight and Cost Min. Value Ideal Value Actual Value T1.1 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 Comfort T2.1 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 Installation T3.1 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 Pass/ Fail MSD - P12031 17
Testing Results Test # Importance Test Item Source Unit T4.0 Normal Sailing Conditions Min. Value Ideal Value Actual Value T4.1 1 Degree of movement of Rudder from centerline degrees 40< 90< 46.6 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 Conditions T5.1 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 MSD - P12031 18 Pass/ Fail
Future Work 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 MSD - P12031 19
Questions and Feedback MSD - P12031 20