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Tommy Tran

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  •  Vehicle weight that we use to design is 720 kg.
    •  Would want to get a more updated quantity of how much the current assembly weighs.
      Would need to include at least: Chassis tubes, Dynamics assembly, Battery Box, Seats, and more.
    •  Can work from a baseline how much the Chassis weighs and then see how any further modification creates how much percentage weight change
  •  Should do onsite measurements and inspection of any implementation method before finalization. This is because there are inaccuracies with the welded Chassis assembly.
  •  We will not model the current thin Bottom Panel and put it into simulations in hopes of contributing to structural integrity
    •  There are too many inconsistencies on the physical bottom panel, e.g. too many wrinkles and unevenly distributed patches of carbon fiber
    •  There were also too many issues with manufacturing it therefore it should not be considered at all
    •  It is also not within our scope or capacity to model a half built bottom panel
  •  We will not manufacture another bottom panel using the current mold
    •  Too expensive; not worth the time; largely backed by Jason and Matt (Mech Advisors)
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Options for Reinforcement

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  •  Review previous simulations
    •  Consider reviewing MS12 simulation files and documentation to learn more about what setups and assumptions that they used
  •  Reviewing simulation setup
    •  It is optimal to be completely certain that our simulations are producing accurate results. If simulations can produce safe results, then no additional weight or labour is added to the Chassis.
    •  Jason and Tommy are available to review FEA setups depending on their availability.
  •  Adding chassis tubes, e.g. more tubes, thicker walled tubes, larger cross section tubes
  •  Sheet metal across a plane of tubes
    •  Carbon fiber panel has better strength-to-weight ratio
  •  Carbon fiber panels across a plane of tubes
    •  Very good strength-to-weight ratio
    •  Involves more manufacturing and time. It also has to be manufactured properly to be effective.
      •  Do we make any CF panels accurately? Have we performed destructive testing on CF panels yet?
        •  Not yet. Would need to be completed within Material Testing Project which is led by Tommy Tran
    •  Would likely need to add some tubes to provide good adhering surfaces
    •  Try to use carbon fiber panels to replicate the benefits that the structural Bottom Panel was intended to provide (i.e. distribute load across all tubes to mitigate point leads; contributes to overall stiffness of the car)
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Housekeeping Reminders

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Please document your work in a confluence page for any work completed for Midnight Sun.
For this specific project, it would be highly advised your documentation includes the following information:

  •  Directly Responsible Individual (DRI)
  •  Advisor or Reviewer
  •  Dependencies
  •  Location of work files, e.g. simulation files.
    Include file name and folder path.
  •  Date
  •  Child pages to separate and document sections of your work

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Project Stage

Description

DRI

PVDR Feedback

Unaddressed PVDR feedback from ASC 2020 PVDR review. Consists of key RED reasons relating to the roll cage.

Impact of Inaccuracies in Chassis Welding on Vehicle Collision Simulations

Chassis has been welded in a rushed and unprepared manner resulting in inaccuracies in tube placement. Simulation analysis needs to be conducted to understand how impactful the inaccuracies are.

Kimberly Liu (Deactivated)

Timeline

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Last updated: May 3, 2021 (7:00 PM EST)

Project Stage

Due Date

Structural FEA & Reinforcements (Overall Project)

May 20th (for momentum and contingency)

Structural FEA & Reinforcements (Overall Project)

End of May (Hard Due Date)

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