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Overall Goal:

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

  • Preliminary CAD should exist. We should have a general understanding of how each part of the car will look.

    • 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

Wire Harnessing

  • Preliminary Wiring Diagram

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