Docstoc

Preliminary Presentation

Document Sample
Preliminary Presentation Powered By Docstoc
					Preliminary Presentation

     BME 401
     Damien Janet
     Charles Te
     Mentor: Dr. David Gray
Project Goals
 “A motorized scooter that works
  indoors and outdoors”
 Maintain similar price to existing
  scooters
Direct Need
 Most commonly provides mobility for
  those afflicted with multiple sclerosis,
  mild cerebral palsy, severe arthritis,
  elderly
 Physiological
 Attitudinal

 Transportation accessibility
 “Consumer needs are everything!” Dr. Jakiela
                                      (Kerri Morgan PPT)
Problem
   Indoor scooters
    are too weak to
    use outdoors

   Outdoor scooters
    are too bulky to
    use indoors
Currently Available
   Models
    – Manufacturers: Pride , Amigo , Bruno ,
                                      TM   TM   TM


      Activa    TM




    – Indoor vs. Outdoor
    – 3-Wheel vs. 4-Wheel


     FOR MORE INFO...
www.pridemobility.com, www.spinlife.com
Current Technology
 Variable speed control US6491122
 Regenerative braking method US5707115
 Steering tiller for personal mobility
  vehicle USD443571
   Dual state controller for brushless
    electric motors US5818195
   Personal mobility vehicle US6176337
Design Specifications
   Reduce rear-wheel base width for indoor
    maneuvering
   Provide adequate turning radius
   Apply outdoor suspension
   Provide adjustability of speed and
    acceleration for variable environments
   In short- “safely shrink” an existing
    scooter
Specifications
                    Estimated/ desired
                     metric changes:
                     – Width ~22.5 in.
                     – Turning radius ~35
                       in.
                     – Max. Speed ~8 MPH
                     – Climbing angle ~15°
Design Alternatives
   Down-scale an outdoor 3-wheel
    scooter
    – Rear wheel steering
    – Variable speed control
    – Reduce rear width- lose stability!
Design Alternatives
   Modifications to
    outdoor 4-wheel
    scooter
    – 4 wheel steering
    – Reduce rear width
    – Desired solution-
      EXPENSIVE!
Design Alternatives
   Create entirely new
    scooter model
    – Existing models
      offer many benefits
    – Cannot meet
      DEADLINE!
Design Alternatives
   Strengthen an indoor scooter (3-wheel)
    – Added suspension system
    – Upgrade braking system
       • Regenerative braking
    – “Training wheels” to increase stability
    – Upgrade top speed and acceleration
Pugh Chart
 Rank Need                   Amigo Wrangler Laser 3W Laser 4W Mod. In. 3W Mod. Out. 3W Mod. Out. 4W
   10 Turning Radius             5        1          2        1           4            3            3
    8 Suspension                 1        5          4        5           3            4            5
    8 Width                      5        1          3        2           4            4            3
    8 Length                     5        1          2        2           4            4            3
    6 Top Speed                  2        5          4        4           4            5            5
    4 Climb Angle                1        5          3        3           3            4            4
    6 Weight                     5        1          3        2           4            3            3
    5 Ground Clearance           2        5          3        4           3            3            4
    6 Brakes                     3        3          4        4           4            5            5
    9 Cost                       4        1          3        2           3            2            2
    9 Stability                  2        5          4        5           4            4            5
   10 In/Outdoor Versatility     1        1          3        2           5            5            3
      Total                    276      229        278      257         340          339          325
Schedule
                         January          February                 March             April
                    13     20    27   3    10  17    24   3   10    17 24   31   1   7   14   21
Vendors / Mentor
Meetings


Research


Design Concepts
Preliminary
Design Analysis
Preliminary Pres.
& Report
Design / Maintain
Webpage


System Modeling
Progress Pres. &
Report


Design Revisions


DesignSafe
Final Report &
Presentation
Responsibility Distribution
   Damien
     – Mechanical design, including CAD
     – Suspension systems
   Charles
     – Web development
     – Steering and tiller design
   Joint
    – Electrical system, braking, and materials
Related Documents
                       Questions?



    FOR MORE INFO...

Damien: drj1@cec.wustl.edu
Charles: cct1@cec.wustl.edu
http://cec.wustl.edu/~scooter

				
DOCUMENT INFO
Shared By:
Categories:
Tags:
Stats:
views:0
posted:5/9/2013
language:Unknown
pages:17