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Modeling Suspension Geometry

Key Parameters

MSXII's suspension will be driven by 11 key parameters: 

Parameters:

  1. UCA mount (x position)
  2. UCA mount (y position)
  3. LCA mount (x position)
  4. LCA mount (y position)
  5. UCA length
  6. LCA length
  7. Upright length
  8. Spindle height
  9. Wheel offset
  10. Wheel diameter
  11. Spindle angle

Note: this geometry is fully defined. 

MATLAB

Types of simulations

Using MATLAB, a simulator has been created to simulate the behaviour of the above geometry. The inputs are the above parameters and the output is the behaviour of the suspension under different conditions. There are two main conditions that must be simulated:

  1. Vertical movement of chassis as a result of braking, accelerating or hitting a bump 
  2. Roll/rotation of the chassis during cornering 

Sample outputs

Below are examples of the outputs that the simulator can generate: 

 

Other Resources

Optimization

There are a number of features, we should consider when optimizing the suspension for MSXII

  • Minimal lateral wheel scrub
  • Minimal change in camber
  • Minimal scrub radius 
  • Minimal bump steer


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