P12031: Motion Assistive Seating Device for Sailing Project Team: - PowerPoint PPT Presentation

P12031: Motion Assistive Seating Device for Sailing Project Team: Faculty Guide: Edward Hanzlik Steven Gajewski Technical Mentor: Kate Leipold Aleef Mahmud Primary Customer: Richard Ramos Secondary Customer: Keith Burhans Mitchel Rankie Sponsor: Mark Smith and M.E. Dept. Christopher Sullivan 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 Secure to Sonar with non-permanent attachments CN1, CN4 ES2 1 Minimum FOS of critical elements found via analysis CN2 ES3 1 Time required to release user from seat and system CN2 ES4 1 Degree of movement of Rudder from centerline of boat CN3 ES5 1 Backlash in the lines controlling the Rudder CN3 ES6 1 Cubic area of disassembled and packed unit CN4, CN6 ES7 1 Corrosion resistance CN5 ES8 1 Functioning emergency overide for Rudder CN7 ES9 1 Location of Track Platform respective to Keel CN8 ES10 1 Length of the distance between hand attachment points CN9 ES11 1 Weight of each part combined CN10 ES14 1 Percentage of amplification of user's force input CN11 ES15 2 Time required to detach hands CN12 ES16 2 User Specified Harness CN13, CN18 ES17 2 Comfort perceived by user from 1[low]-10[high] CN13, CN18 ES18 2 Height of crank shaft relative to the bottom of the seat CN14 ES19 2 Clearence of tangle prone lines from chair swinging CN15 ES12 3 Angle of tilt of chair relative to horizontal plane of deck CN16 ES13 3 Cost of components purchased for design during MSD CN17 ES21 3 Time required for entry CN19 ES22 3 Functioning rearview mirror CN20

Functional Decomposition User Device Boat Portability Tiller Shifting Attachable Control Weight Non Assembly Rotate hand Ropes and Locking Restrain Override Permanent Required Crank Pulleys Mechanism User 4-Point Steering Major Parts Ropes Taut Hands Feet harness column tilt Track Passenger Pedestal Tiller Strut Tiller Arm Platform Interface 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 Importance Description Status Need # Pass 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) Fail CN10 1 25% weight reduction Pass CN11 1 Ease of operation (biceps work required reduced) Pass CN12 1 Easy to detach hands from crank MSD - P12031 15

Secondary Objectives Customer Importance Description Status Need # Pass 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 Fail CN20 3 Rearview mirror MSD - P12031 16

Testing Results Min. Ideal Actual Pass/ Test # Importance Test Item Source Unit Value Value Value Fail T1.0 Weight and Cost 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 MSD - P12031 17

Testing Results Min. Ideal Actual Pass/ Test # Importance Test Item Source Unit Value Value Value Fail T4.0 Normal Sailing Conditions 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

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