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All things Dynamics
Random Stuff Jens Found:
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https://www.acornbearings.co.uk/downloads/catalogues/aerospace/super-precision-plain-bearings/rbc-aerospace-plain-bearings.pdf - page 17 for Spherical Bearing Installation Idea
https://journals.sagepub.com/doi/pdf/10.1177/1687814016668765
https://skill-lync.com/student-projects/Steering-force-calculation-09215
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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
https://danceswithcode.net/engineeringnotes/quaternions/quaternions.html
https://blogs.solidworks.com/tech/2018/07/what-is-a-stress-singularity-in-solidworks-simulation.html
https://www.boltscience.com/pages/basics1.htm
https://motiongen.io/ ← generate and simulate linkage systems
Decision Matrices:
3- vs. 4-Wheel Decision Matrix
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- 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. - Fits for FSU
Rim to Hub
-The circular interaction will be undersized to the nominal value rim
-The holes for the dowel pins will be undersized in relation to the nominal diameter as dowel pins usually come oversized
Hub to Spindle
-The OD of the bearing will need a interference fit and the ID will need a loose running fit
-Will need further spec from the bearings to properly define
Spindle to Upright
-For the bore and shaft a H7/p6 fit will be used (locational interference)
-Also keep in mind that we want flat surfaces in contact at the “head” of the spindle and the upright so tolerance some flatness on those faces, ensuring they are perpendicular to the bore
Upright to Control Arms
-Connection comprised of spherical bearing and shoulder bolt
-Shoulder bolts typically have a tolerance range below the nominal value so the hole in the upright should have a tolerance to match a close running fit