156B Week 3

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

• Mock-up seat and arm pedal boom construction completed for design review.

• Final Solidworks design completed and ready for review.

• Argon for titanium welding has been received.

• Solution for mandrel construction achieved.

• Titanium supply ready to be made use of.

Accomplishments from Previous Week

• Circular cross-section tube determined to be shape of carbon base tube. (Nicholas, Sean, & Angelica)

• Have developed Matlab function to help streamline data recording / analysis during seat positioning test with Lance. (Nicholas)

• Obtained carbon properties for base tube. (Sam & Ved)

• Completed construction of mock-up seat and final design ready for design review this Tuesday. (Sam, Sean, & Angelica)

• Received Lance's ideal seat angles and distance of arm pedal boom from him. (Sam, Ved, Nicholas, Sean, & Angelica)

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

• Analyze, brainstorm and iterate solutions of seat, arm, foot geometry for Lance. (Nicholas & Angelica)

• Determine testing capabilities of on campus lab. (Ved, Nicholas)

• Begin fabrication of mandrel. (Sam & Ved)

• Obtain titanium after design review and begin fabrication of front and rear end pieces of trike. (Sam, Sean, & Angelica)

• Research wheel canter angle for front wheels. (Sean & Angelica)

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

• Learned that bending titanium tubes is possible if the tubes are 7/8" diameter. Seat frames likely to be made of titanium now to eliminate extra interface between aluminum and titanium. (1/24/17 in person)

• Received information on how to apply lamination theory for carbon base tube to model FEA in Solidworks. (1/24/17 in person)

• Molding carbon around mandrel is a viable option and has it's pros and cons compared to rolling carbon around mandrel. (1/24/17 in person)

• Given links to all attachments to the trike. This improves modeling parameters to minimize wasted space in design. (1/24/17)

• Recommended different configurations on pushbar attachment. (1/24/17 in person)

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

• Instructor asked for more details and pictures of the Ackermann steering geometry. (1/19/17 in person) Include clearer pictures and diagrams in next presentation.

• Model FEA with center of mass of trike frame in addition to masses of the two riders. (1/19/17 in person) FEA needs to be redone.

• Consider strength of epoxy applied carbon-titanium interface in relation to application of trike and it's longevity. (1/19/17 in person) More details about epoxy bonding to be asked of Mike Lopez during final design review.

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

• Safety concerns involving carbon frame splintering/total destruction (1/19/17 in person)

Risks and Areas of Concern

• Little experience with titanium welding. Further practice with Tom necessary.

Resources or Information Required but not Available

• N/A

Schedule

• Finish building seat positioning and finalize frame design with sponsor 1/24/17

• Updated certain Gantt chart tasks with percentage completed.

Budget (list amount spent and amount remaining)

• Spent: $0.00

• Remaining: $ 9995.70

Progress on Report and Webpage

• Week 3 progress report complete.

• Select sections of report to be uploaded Friday 1/27 by midnight.

• Home page under construction.