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Overall Goal:

  • To demonstrate that the preliminary design follows all system requirements and is feasible within resource, time, and time manufacturing constraints

  • To establish a foundation for moving forward with detailed design and prove that the design is ready to proceed

  • By this time, all architectures are final. This review will discuss the architectures and design options that were considered and explain why the final architecture was chosen over the other options

  • A rough prototype Preliminary CAD should exist in the form of CAD. This prototype should show what . We should have a general understanding of how each part of the car will look like. Parts do not have to be detailed; they can be placeholders in the general form they will take.

    • This allows advisors to have physical context for the choices we are making

  • System bounding boxes must be fixed after this point

  • Major system-design critical OEM components should be selected and validated

Validation:

  • Approach should be validated with proper hand-calcs and FEA

  • A discussion of how you found your inputs will be required to convince the audience that your analysis is correct

  • Explain why you used this methodology

Implementation Plan:

  • At the end of PDR, why you chose the design and how you will implement it/proceed with it should be defined

    • General manufacturing process/steps selected

Between PDR and CDR, all that should change is the optimization of designs. Weight savings, improving intra-system interfaces and repairability, more in-depth planning for manufacturing

System Deliverables:

Dynamics

Body

Electromechanical

Aeroshell

Suspension

  •  Suspension Type Selected
  •  Hardpoints Finalized
  •  Shock Selected
  •  Shock-Pot Mounting
  •  Motion Ratio, Spring Rate determined

Frame

  •  Bounding Boxes Finalized
  •  Roll Cage Finalized
  •  Passing Frame Sim
  •  Preliminary Tab Placements

Battery

  •  Battery Layout Finalized

Aerodynamics

  •  Top Shell Finalized
  •  Initial Shell to Frame
  •  Shell-to-Shell Options
  •  Preliminary CFD Results
  •  Pitot Tube Mounting

Unsprung

  •  Brake Calipers Selected
  •  Wheel Bearing Selected
  •  IMU, Hall Effect Mounting

Enclosures

  •  Enclosure Mounting Locations
  •  Number of Enclosures Fixed
  •  Waterproofing Plan

Steering

  •  Rack Selected
  •  Ackerman Geometry Finalized
  •  Upper Steering Linkage Power Transmission Chosen
  •  Pot Mounting

Ergo

  •  Preliminary Pedal Box
  •  Driver Position Fixed
  •  Preliminary Brake Routing Diagram
  •  Steering Wheel Design
  •  Ballast Location

Cooling

  •  Cooling Strategy Selected
  •  Rough Routing Scheme
  •  Battery Thermal Testing Results

Composites

  •  Research Results (short presentation)
  •  Mold Reference Scheme Selected
  •  Manufacturing Plan

Wire Harnessing

  •  Preliminary Wiring Diagram