156B Week 4

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

We are still in large analysis stage. This has proved more work than we anticipated. It has set us back in our schedule slightly. 

Accomplishments from Previous Week

• • Rotterdam research

    • 8-10 chains, experience no movement, or chain failures (that they told us about

    • No engineering (loading, thermal, or otherwise) max tension in chains

    • Very fast operation with high customer satisfaction

  • Slip

  • Vibration

  • Thermal

  • Creep

  • Chain sleeves

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

• • Tension system design (Everyone will participate)

  • Pick parts (Everyone will have a few)

  • Cost analysis (Everyone)

  • FMECA (Everyone)

Sponsor Comments from Last Meeting and Actions Taken to Address these Comments

• • Our presentation skills could use work

  • We should use a laser pointer and remote clicker

  • Talk towards the audience instead of the screen

  • Make the presentation more formal

  • Tug boats may use a drum damping system 

  • We need to consider extra capacity for removal of chains or in case of a chain failure

Instructor Comments from Last Meeting and Actions Taken to Address these Comments

• • Missing background and deliverables headers on reports

  • Thermal expansion analysis requires more range (extreme low and high over 6 month period)

  • Consideration to use spring and damper system only on one side and other side fixed (this eliminates over constraints and reduces the ammount of components)

  • Can look into alternative damping systems: in cranes, cars use leaf spring (spring + damper)

  • Could contact Caterpillar corp for where they get their parts 

  • Can use rod inside spring to prevent spring explosion in event of failure

  • Should do analysis using centenary equation and how that provides extra load on chain and changes the angle

Comments from Other Students in the Class 

• • Did well: good equations, FBDs, clearer presentation, nice graphics, felt confident in approach, good analysis

  • Improve: standing with hands in pockets, explain fail safes, one person talks too much (Alex), review of problem definition (holistic view). Presentation size consistency, face audience, explain analysis, make our decision process more obvious

Risks and Areas of Concern

• • Scale model exicution

  • Having enough time for everything

Resources or Information Required but not Available

• • N/A

Schedule

• • Finish all analysis

  • Final Design choice CAD designs/simulations (2/6/17) (Maybe later now)

  • FEM

<model design phase>

• • complete design of model demonstration (2/13/17)

  • Scaling (depends on what model we make: superficial or testing of a component)

<start model production phase>

• • test and optimize components of model demonstration (2/27/17)

  • finish model demonstration (3/17/17)

  • Project presentation (3/22/17)

Budget (list amount spent and amount remaining)

• • Amount spent: $0

  • Lab fee: $1,800

  • Amount Remaining : $8,200

Progress on Report and Webpage

• We will continue to work on the report.

  • We have uploaded a lot of information to the internal side of the webpage.

  • The webpage still requires some work all around.