156B Week 4

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

• • Final design choices pending sponsor and artist review 

  • We have some preliminary engineering design choices based on conclusions from simulations 

    • We suggest fabric and some kind of rigid structure to prevent twisting

Accomplishments from Previous Week

• • Completion of full scale test

  • All videos and data uploaded onto our drive

  • Preliminary comparisons of simulations and experimental data completed 

    • Similarities in period predictions and velocity predictions

    • Amount of fabric drag very close in MATLAB 

    • Adjusted Working model fabric simulation also very close to experimental data

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

• • Complete data extraction from videos of amplitude and velocity (Gwen and Nina)

  • Testing of spreader bars to counteract twist on scale model

    • Test different placements of bar (Alex and Nina)

    • Model spreader bars in Working Model (Engleap)

  • Presenting data to sponsor (Gwen and Nina)

  • Continuation of light prototype (Yuji)

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

• • Sponsor does not want fabric, has concern over cost and effectiveness (4/22, in person meeting)

    • We have listed the pros and cons of having fabric and will be completing a cost benefit analysis of various fabric choices (Uploaded on this page)

  • Sponsor would like to use landscape (trees, bushes, etc) as obstacles to prevent people from pushing or swinging too high

    • We have discussed with advisors and are considering other options

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

• • P. Gillet has suggested looking into the spreader bars  

Risks and Areas of Concern

• • There is a growing gap between the sponsor's desires and the choices we are recommending. 

    • We are working on conveying our thoughts in a more effective way

Schedule

• • By Week 7: Design for full scale test determined and all components ordered

  • By Week 8: Simulation are updated to the best of our ability 

    • Full matrix of recommended safety solutions for each swing 

Budget 

• • Amount Over: -$818.16

  • Amount Spent: $3418.96

Progress on Report and Webpage

• • Final report draft has been started

    • Draft is due end of Week 5