P12031: Motion Assistive Seating Device for Sailing

Transcription

1 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 - P

2 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 - P

3 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) CN % 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 CN % cost reduction in BOM CN17 3 Better fitting harness CN18 3 Less abrasive harness CN19 3 Easier entry for user CN20 3 Rearview mirror

4 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

5 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 - P

6 System Interface MSD - P

7 Boat Constraints MSD - P

8 Pedestal Base MSD - P

9 Track Platform MSD - P

10 Tiller Strut MSD - P

11 Seat Support Rib MSD - P

12 Seat MSD - P

13 Crank Design MSD - P

14 Hand Crank Design MSD - P

15 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 CN % weight reduction Fail CN11 1 Ease of operation (biceps work required reduced) Pass CN12 1 Easy to detach hands from crank Pass MSD - P

16 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 - P

17 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> 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^ > 66679> 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 - P

18 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 - P Pass/ Fail

19 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 - P

20 Questions and Feedback MSD - P