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Objective

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  • Project goals

  • Background research

  • Notes from discussion with suspension

  • Any design criteria and other considerations

  • Any sources used

  • Any visuals used

Double Wishbone Suspension - How does it work?

To first understand DWS, it’s important to understand camber.

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These are cool because they allow each suspension to act independently - if there is a bump on the road that affected only the front right wheel, it’s suspension system is the only one that would react. (Race Car Design by Derek Seward - 3.1: Introduction to Racing Car Suspensions)

The Bell Crank

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Push Rod, Bell Crank, Shock

A push rod “pushes” so that the bell crank can transfer motion to the shock. (pull rods also exist)

A bell crank pretty much acts as a motion-transferring intermediary b/w shock and push rod.

Shocks make sure spring don’t compress/extend excessively, also springs do suspension essential func.

Multilevel Frame Architecture

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Important note: External vs Internal suspension system hardpoints are the EXACT same.

Taking a look at the Old Suspension and Frame Systems

Observations (suspension)

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Should we use a diagonal pipe at the front? I notice some FSAE teams use that. What’re the pros and cons of each?

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There is a TON of pipes.

Why are “X” shaped crosses used in some places, “*” K shaped ones in other ones, and regular triangles in the rest?

  • Because you need different load paths for different types of load. Understand that X shape, single diagonal, K shape, they all have differing complexities of welding. Also, more pipes means more weight. Must consider ALL of this when designing a frame.