156A Finals (Torture) Week

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

• • Upper bound on energy requirements for plate excitation complete

    • Plate likely to shrink in size (lower energy required)

    • Methodology for energy production: likely gravity drop (possibly w/ spring assist)

  • Deflection due to acceleration profiles determined

  • Foam static deflection calculated

  • Foam natural frequencies calculated

    • Various foams, using hand calculations and FEA

  • Natural frequencies of larger fixture plate determined

    • Shrinking of plate will increase frequencies (GOOD)

  • FFTs of various profiles completed

Accomplishments from Previous Week

• • Deflection due to acceleration profiles determined

  • Foam static deflection calculated

  • Foam natural frequencies calculated

    • Various foams, using hand calculations and FEA

  • FFTs of various profiles completed

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

• • Foam base analysis/dimensional requirements - Leighy

    • Sizing to hold plate

    • Any gaps to allow impact head to pass through and impact fixture plate

  • Fixture plate analysis/dimensional requirements - Sam

    • Increase natural frequencies without exceeding ~175 kg mass

  • Impact head bearing analysis - Troy

    • Sizing and friction reduction for impact head weight (~50kg weight + swinging motion)

  • Impact head collision analysis - Roy

    • Ensure head natural frequencies are LOWER than that of fixture plate

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

• • Suggestion on risk reduction: determine viability of foam base

    • Other systems (i.e. slider/swinger) increase scope and budgetary needs; less likely to have deliverable (and deliverable would be lower quality/less tested)

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

• • (No comments yet)

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

• • (No comments yet)

Risks and Areas of Concern

• • Finding a method of arresting impact head and preventing secondary impact

    • Arresting head natural frequency needs to be lower than plate frequency to prevent double contact due to ringing

Resources or Information Required but not Available

• • None yet

Schedule

• • Describe upcoming milestone

  • Update Gantt chart.

Budget (list amount spent and amount remaining)

• • Spent: $0

  • Remaining: $1,500

Progress on Report and Webpage

• • Started on team members section. Need to fill out "about" sections (about ATA, us, the project, etc.)

  • Maybe use more interesting formatting