156B Week 7

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

• Fabrication is to begin this week as parts begin to get here

• The majority of the parts are being shipped (the final parts have short lead times)

  • Verified that all remaining raw materials are available at Urey machine shop

  • Verified that new pendulum arm will not bend with SolidWorks Simulation

Accomplishments from Previous Week

• The design was run by Tom and Jack in the machine shop again and a couple modifications were suggested, including cross straps for support and a new pendulum mounting apparatus

• The manufacturer was contacted for an update on the current shipping information of the brake

• Dimensioned engineering drawings of the final model were created to speed up the assembly process

• Dynamics of buoy is close to complete since we will be getting wave simulation data with height, angle, time from sponsor

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

• Working on assembling the structure based off of the current parts (Derrick/Zhan

• Getting the electronics to be used with the braking system (Chris/Ky)

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

• Was pleased overall with the modifications made to the design

  • However, warned us about large stress on brake mounting plate, so mounting plate has been redesigned and reinforced

• Mentioned that the order for McMaster parts had been placed

• We discussed the dynamics of the buoy with the sponsor and sponsor informed us that he had access to wave simulation data with height, angle, time

  • Wave data can be directly plugged in to get motion of buoy

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

• There was concern drawn to the idea of having the pendulum be supported at the color by two bolts and a dowel through the shaft was suggested

  • After discussion with Jack, a design involving an aluminum piece set in the hollow aluminum tube was designed reducing the forces on the rod while not destroying the structural integrity of the piece

  • Discussed brakes and how we should be able to control braking force with different amounts of current

  • Custom printed PCBs are more reliable and can be gotten pretty quickly and cheaply

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

• N/A

Risks and Areas of Concern

• The vibrating of the structure is a concern because it is relatively tall and can not afford braces connecting the two a-frames near the top

• Getting the electronics should not require much time, but the order still needs to go through

Resources or Information Required but not Available

• N/A

Schedule

• The assembly will be finished in the coming two weeks

• The controls will be finished this week

• The wiring will be hooked in Week 8

• Testing will be held in the latter part of Week 8 and beginning of Week 9

Budget (list amount spent and amount remaining)

• Spent: $1420

• Remaining: $3480

Progress on Report and Webpage

• First draft of report and webpage is completed

• The draft of the report will be corrected and resubmitted by this Friday