156B Week 1

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

Components necessary to conduct titanium welding have been received.
Training in welding for fabrication of trike components has begun.
Material components of trike have been narrowed down to a carbon composite main tube body with titanium alloy attachments on the front and back ends.
Updated FEA/Vibrational analysis model of trike in Solidworks.

Accomplishments from Previous Week

Practiced basic arc welding with steel. (Sam, Sean, & Angelica)
Received spare titanium tubes for titanium welding practice. (Sam & Sean)
Received appropriate pulse arc welding attachments from Tom for welding machine in the machine shop in order to accomplish titanium welding at UCSD facilities. (Sam)
Adjusted FEA/Vibrational analysis to account for mass rather than force at the suggestion of reviewers of the Risk Reduction Presentation (Sam, Nicholas, & Angelica)
Researched into different grades of titanium and carbon composites. (Sean, Nicholas, Sam, Ved, & Angelica)
Decided on Tadpole trike geometry after weighing pros and cons of both Delta and Tadpole orientations. (Ved, Nicolas, & Sean)

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

Decide on what grade materials of titanium and carbon to use based on physical properties, vibrational analysis, and key factors like weight and length. (Sam, Ved, & Sean)
Begin ordering materials to start preliminary testing. (Ved & Angelica)
Determine seat angles in relation to frame and boom. (Sam & Angelica)
Work on optimizing rear configuration and develop boom designs. (Sam & Nicholas)
Research pros and cons of different tube shapes for center tube of the trike. (Nicholas, Sean, & Angelica)
Research different seat suspension options while taking into account the natural damping of the trike frame. (Ved, Nicolas, & Sean)

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

Tips on welding practices specifically for titanium as well as recommendations for material choice, tube thickness, etc. Titanium welding practice to be conducted in coming weeks (12/9/16 in person)
Research different steering geometries for more stable turns. Steering geometry research has begun and will continue into the next couple of weeks. (12/9/16 in person)
Suggestions on a few different titanium alloys to consider. Considering moving forward with ATI 3-2.5 Titanium, grade 9 cold worked stress relieved for titanium components. (12/9/16)
Information received that a high-quality custom carbon tube may be created for the main body tube of the trike. This route has been decided by the team to be optimal and will be used as the project moves forward. (12/9/16 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)

Adjustment of FEA/Vibrational analysis to account for mass rather than force. This suggestion was applied and is included in our updated analysis of our model. (12/5/16 in person)
Take into account the natural damping of the trike frame when deciding on seat suspension. Research into optimal suspension systems to be conducted in coming weeks. (12/5/16 in person)

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

Risks and Areas of Concern

Resources or Information Required but not Available

Schedule

Budget (list amount spent and amount remaining)

Progress on Report and Webpage