# Static analysis of bicycle frame - Need some clarification

• I
Hey,
I am interesting in analyzing a bicycle's frame statically from a vertical fall of x metres, this after using the energy principle i get that the force F = mv^2/r, where v = sqrt(2*g*h), r is the deformation of the bicycle at its contact point and m is total mass from the cycle and cyclist. The only unknown i have is r, which i assume to be the suspension travel (there is one at the front and one in the rear) and i use the linkage to get the correct travel at the contact point.

The issue i find is that when i use this formula i do not consider the "damping" effect that the suspension has during its travel, i can of course do some backwards-engineering and use the knowledge of my spring constant and calculate at what height will the suspension reach the bottom but even then will i not take in consideration at how the suspension has dampened the fall.

My first idea was to simply subtract forces and use the abundant force from maxing out the suspension and use this in my static analysis, however it seems like i confuse forces with energy by doing this.

For my analysis i use Ansys btw.

Kind regards,
Daniel

Andrew Mason
Homework Helper
Hi DanielSu. Welcome to PF!

Your question, I am afraid, is incomprehensible. If you wish others to help you with a problem you have to state the problem clearly. You also have to actually show us what you have done to solve the problem.

AM

You're right Andrew, i will delete this thread and repost a new (better) one If i find the time, i think by just writing this thread i made stuff clear in my own head (and things unclear in yours).

Andrew Mason