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https://www.youtube.com/playlist?list=PLbMVogVj5nJTW50jj9_gvJmdwFWHaqR5J ← Playlist from IIT/IISc on Vehicle Dynamics (a 32 hour-long lecture series)
https://www.nhbb.com/knowledge-center/engineering-reference/rod-end-spherical-bearings/load-ratings#:~:text=Axial%20Proof%20Load%3A%20The%20axial,003%20or%20less. Resource on loading bearings
Decision Matrices:
3- vs. 4-Wheel Decision Matrix
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- Disc Brakes - we have them from MSXIV and the have a smaller volume compared to drum brakes, making them easier to integrate next to the wheels, which have a positive offset.
- Hydraulic Shocks - from early research it looks like gas shocks provide some resistance which will add to the overall spring rate of the wheel. Considering MSXV will be lighter than a standard consumer car, finding coil overs with a low spring rate may already be challenging, and having gas shocks which would require us to run a lower coil over rate to run our desired rate will prove challenging. Source: https://www.youtube.com/watch?v=o70v71Rxsyg
- System Parameters
*Camber - 0 deg
*Caster - 3 deg
*Toe - 0 deg
Scrub Radius - 20 mm
*Based on generally accepted values and reaching out to other teams to see what they use in their cars.
Scrub radius driven by space near the wheel for brakes. - Steering
My matlab script looked into a lot of different configurations and found the configuration as shown in this desmos link. However, it is not perfect as this simulation did not account for the angles on the steering axes, so the optimization of ackerman is in question. Due to deadlines, we took values from this configuration and designed our steering system based off it. Items such as:
Steering Arm Length
Tie Rod Length
Rack Length
Rack Mounting Distance from Axes
When implementing the CAD, we kept the steering arms perpendicular to the king pin axes, and used the tie rod to connect the ends of the steering arm to the rack without caring about the steering arm-tie rod node’s position.
In the future, try to solve the three dimensional system.