Calculating geometry for single pivot arm

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SUMMARY

This discussion focuses on calculating the geometry for a single arm suspension system in a light electric vehicle project. The user intends to utilize a Fox Float Air Shock with a length of 190mm, featuring pressure control and adjustable compression and rebound settings. Key inquiries include determining a linear or slightly progressive geometry and methods to adjust the progression based on different shock absorbers. The conversation references race car suspension principles, including calculations for spring rate and motion rate.

PREREQUISITES
  • Understanding of single arm suspension mechanics
  • Familiarity with shock absorber specifications, particularly Fox Float Air Shock
  • Knowledge of suspension geometry calculations
  • Basic principles of race car suspension dynamics
NEXT STEPS
  • Research methods for calculating single arm suspension geometry
  • Learn about shock absorber characteristics and their impact on suspension performance
  • Explore calculations for spring rate and motion rate in suspension systems
  • Investigate progressive suspension design techniques and their applications
USEFUL FOR

This discussion is beneficial for automotive engineers, hobbyists building electric vehicles, and anyone interested in suspension design and optimization techniques.

trial_
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Hi, Guys, I am building light electric vehicle for fun and hobby.

I am experimenting with stuff, but have some difficulty calculating a reasonable geometry for the suspension.

It is a SINGLE arm suspension and I am planing to use Fox Float Air Shock with length 190mm, it has pressure control and compression and rebound adjustments. Progressive behavior.

I am attaching a picture with explanation what I am trying to achieve, if somebody can point me in direction how to calculate a linear or slightly progressive geometry I will be super grateful! Also, how to control and change, the progression of the geometry, if I decide to use another type of absorber.

It is NOT meant to be multi linkage geometry, only one rocking part, pretty much a triangle - axis of rotation, travel point and the last point where I mount the shock, which I am looking to calculate somehow.

Thanks a lot :)

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the answers are in race car suspension class posted above including calculations of spring rate for mounting angle, motion rate wheel rate etc...
 

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