AirSpring. - Firestone

SAMPLE CALCULATIONS:
AiR SPRINGS & SUSPENSIONS
49
CA[.CUET|NG DYNAH|C
AND :REQUENCY
The dynamic rate of an air spring over
a plus and minus 1/ inch stroke is
calculated using Formula 8 on page 42,
substituting values as follows:
Where.
K Rate (lb/in)
Pal- Absolute pressure (psia) at
design position
Gauge pressure (psig) at design
position plus 14.7- Pgl / 14.7
Effective area (ins) at design position
Load (lb) / Pressure (lb/ins)
Ac Effective area (ins) at 1/ff inch
below design position
Load (lb) / Pressure (lb/ins)
Ae- Effective area (ins) at / inch
above design position
Load (lb) / Pressure (lb/ins)
V1
Vc
Ve
Internal volume at
design position (in
Internal volume at / inch
below design position (in
Internal volume at /ff inch above
design position (in
For example, find the air spring rate
of the 1T15M-11, W01-358-9320 at an
18 inch design height and a load of
7000 pounds. See the Product Data
Sheet for the necessary information.
The effective area on the 100 psig curve is
calculated:
A1- Load 7146 71.46 in
Pressure 100
Also calculate A and A.
A 7146 71.46 in
100
7146
A 71.46 in
100
Then calculate the pressure at
7000 pounds:
7000
71.46
97.96 psig