156B Week 4

1/26/21 Professor Meeting

Weekly Progress Report

What have been done in the past week

• Continued constructing models finalized in first 2 weeks of quarter

  • 2D moment tool materials purchased and currently in machine shop

  • 3D moment about an axis model completed

  • Reactions at supports and connections model was redesigned and is currently in the process of construction

• Brainstormed ideas for the following design challenges:

  • Truss Challenge

    1. Produced 2 different ideas to implement

  • Center of Mass Challenge

    1. Created a list of preliminary designs for shapes

• Hyatt Regency Model

  • Bought materials

  • 3D printed parts

  • Made Solidworks assemblies

• Vector in a Box Model

  • Presented first design to sponsor

  • Created sketches of one configuration

  • Researched materials to purchase

Feedback from meeting with sponsor

• Truss Bridge

  • Suggested Lego-technic parts (beams, caps, etc)

  • 3D printed truss member no longer a top material choice

    • Material properties non-homogeneous

    • Costly + requires hours of printing

      • Would need to factor in labor fee (~$15/hr)

  • Should consider pros and cons of different materials

  • Preferred to have multiple truss structure options (roof, bridge, etc)

  • Utilize gussets (could be another constraint, limited amount given)

  • Brainstorm more details about the supports

  • Justify design decisions instead of asking for sponsor preference

• Center of Mass

  • Create a mix of shapes that incorporate additive and subtractive methods of computing center of mass

  • Make sure the each shape can be stacked in multiple configurations

    • meaning not just rest on the top of stack

  • Find a material that students can use to construct the shapes themselves

• Vector Box

  • A telescoping vector is more suitable than stacking magnets

  • Interlocking box sides will make assembly easier and model more robust

  • The plane can come from the box sides or attach onto the vector

• Hyatt Regency

  • Delay Solidworks simulations, focus on building the physical model

• $750 is our budget for research/prototyping -- larger budget for mass production of design challenges

List your current concern according to the importance

• Finalizing the details of the truss design challenge

  • Materials should be purchased before the end of the week

• Ask Professor Qi how our group should approach the “Applicable Standards” and the “Prototype Performance” sections of the report

What is the next step of your project

• Build Hyatt Regency model this week

• Finish building the reaction supports/constraints model this week

• Finish building the 2D moment demonstration tool

• Finalize designs for shapes for center of mass design challenge

• Finalize designs, buy materials, and start building prototypes for the truss design challenge

• Proof of Concept Presentation due next Tuesday

• First draft of report due next Friday

• Purchase supplies for the vector box