Preliminary Design Review Guidelines
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 Manufacturing Plan |
Wire Harnessing Preliminary Wiring Diagram |
Presentation Content
Dynamics | Body | Electromechanical | Aeroshell |
|---|---|---|---|
Suspension Architecture selection Decision matrix? Packaging Weight Goal Material Selection Telemetry/Data Acquisition Sensors Mounting Manufacturing | Frame Frame Frame Jig Approach Features Layout Hardpoint Jig Approach Features Layout Packaging Layout Where other systems and assemblies will go Node map Tube Geometry/Sizes Purpose of tubes/sections Weight Goal Optimization/savings Material Selection Tube material Filler material Torsional Rigidity Simulation Validation Timeline | Battery Battery layout Components | Aerodynamics Design philosophy/process Architecture selection Decision matrix? Shell configuration (canopy, top/middle, bottom, aero covers) Cl and Cd goals CFD analysis Setup Results |
Unsprung Architecture selection Decision matrix? Component design Component Selection Bearing selection Caliper selection Brake rotor selection Brake button selection Wheel selection Tire selection Packaging Assembly Weight Goal Material Selection Brake rotor Upright Hub/Axle Telemetry/Data Acquisition Sensors Mounting Manufacturing | Enclosures Enclosure Mounting Locations Material selection Manufacturing plan Waterproofing Plan | ||
Steering Architecture selection Decision matrix? Steering transmission Upper and lower Packaging Component selection Rack selection Bearing selection U-joint/bevel gear selection Ackermann and bump steer Weight Goal Manufacturing | Ergo Driver Positioning Steering Wheel Material selection Positioning Seat and Headrest Material selection Positioning Pedal Box Mounting Material selection Geometry Timeline | Cooling Cooling Strategy Selected Type of cooling system Layout/packaging Rough Routing Scheme Material/component selection Battery Thermal Testing Results | Composites Material selection For each section of the shell For any hinging mechanism/fastening mechanism Epoxy, mold release, etc. Manufacturing plan Mold Layups Mold release Etc. |
Wire Harnessing Preliminary wiring diagram |