Dynamic load from mechanical unit
Dynamic load from mechanical unit
(OP)
I am a structural engineer and I would like to know if there is a calculation that translates the peak dynamic motion of a large HVAC unit to an equivalent static force for simplification. Or, do HVAC suppliers, such as Trane, have data available for the engineer's use?
-rob
-rob






RE: Dynamic load from mechanical unit
I have never heard of any with commercially available units. Check with the mfg. I think it wouldn't exceed 10% of the dead load...
RE: Dynamic load from mechanical unit
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: Dynamic load from mechanical unit
Here is what I have been doing. This is based on the "deflection magnification factor" or "amplitude ratio" that I get from my old mechanical vibrations text books.
X_dyn/X_static = 1 / [sqrt (1-r^2)^2 + (2*zeta*r)^2 ]
where
r = w_equipment / w_structure = ratio between the operating frequency of the equipment and the natural frequency of the structure.
Zeta = fraction of critical damping