Hi guys,(adsbygoogle = window.adsbygoogle || []).push({});

I must simulate with simulink an air spring, connected to a device. In many book is present this non linear formula:

k(h)=-(n*P0*Ae*h0^n)/(h^(n+1))

Where:

P0 is the air pressure at the equilibrium condition

h0 is the spring heigth at the equilibrion condition

Ae=F/P0 is the effective area

n is the polytropic coefficient

So for checking the formula, I try to compare my result with the stiffness provided by the supplier and unfortunately I get a different value (40% less) .

In this link you can find an air spring catalogue:

http://213.164.133.30/catalog/ShowBalgPDF/SZ 50-11.pdf

For example, at 3bar=3*10^5 Pa I got an force of 1200N, h0=0.15m

K(h0)=1.4*1200/0.15=11200N/m, instead of 18500N/m. What is wrong in my calculation?

Thanks

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Air spring stiffness calculation

Loading...

Similar Threads for spring stiffness calculation |
---|

Question about springs to support a "floating" table |

Understanding pneumatic springs |

Total elongation of differently shaped "springs" |

Design of an Open Coil Spring |

Effect of spring force on acceleration |

**Physics Forums | Science Articles, Homework Help, Discussion**