156B Week 2

Overview of Status of Analysis, Design, Fabrication, Tests, etc.

• • Analyzed linear motor in to obtain requirements.

  • Fabrication of shoulder mount to attach to test bed.

  • We tested motor placement in SolidWorks and MATLAB for range of motion.

Accomplishments from Previous Week

• • Purchased materials, motors, and shoulder pads for testing

    • Elastic band

    • Linear motor, 30mm

    • Linear motor, 50mm

  • Sourced clavicle brace for Max's size to mount motor on

  • Developed CAD models of actuation methods in SolidWorks

  • Developed and 3d-printed concept for brace 

  • Met with family for more input

    • Tested four methods of sensing input

    • Received doctor's input on feasibility of linear motor

  • Narrowed actuation options down due to body constraints and aesthetic appeal to Max

    • Eliminated servo motor

    • Eliminated flex shaft idea

Goals for Next Week (list names after each item). Use specific and measurable objectives.

• • Contact sponsor to:

    • arrange mold of Max's arm

    • Make custom pediatric brace

  • Reach out to bioengineering department for advice on design for human body

  • Draw concepts for battery and Arduino placement on body

Sponsor Comments from Last Meeting and Actions Taken to Address these Comments (indicate date of comments and if via email or in person)

• • Focus on design comfort (3/18 - Dr. Skalsky) - Action taken: Look into what Max currently is using on his brace as it seems to suit him well

  • Minimize the weight through the shoulder (3/18 - Dr. Skalsky) - Action taken: Incorporate strap attaching to clavicle brace that will distribute weight from linear motor and brace through trunk.

Instructor Comments from Last Meeting and Actions Taken to Address these Comments  (indicate date of comments and if via email or in person)

• • Simulation of range of motion(4/4 - Gillet) - Action taken: Made an assembly of the arm, brace, and linear motor in Solidworks. Made an optimization code in Matlab to determine placement of motor

  • Need to start spending more money(4/4 - Gillet) - Action taken: Ordered several parts for prototyping

  • Become familiar with Don Norman's work (4/4 - Gillet) - Action taken: watched several lectures given by Don Norman

Comments from Other Students in the Class (indicate date of comments and if via email or in person)

• • None sent yet

Risks and Areas of Concern

• • Range of motion obtained from actuation method

    • Need to avoid overextension and over-retraction

  • Being able to attach material and comfort associated with them

  • Fitting the brace on Max and wiring

  • Decide on control method

Resources or Information Required but not Available

• • Mold of child's arm (will set up meeting with orthotist with help of Dr. Skalsky)

Schedule

• • Meeting with orthotist TBD 

  • Update Gantt chart.

Budget (list amount spent and amount remaining)

• • Spent: $404.

  • Remaining: $1096

Progress on Report and Webpage

• • Report: Started writing report

  • Webpage: Adding front page information, regular updates of files, added spreadsheet for budget