Equivalency of random vibration and sinusoidal vibrat ion
Equivalency of random vibration and sinusoidal vibrat ion
(OP)
It is recognized that there is no "real" equivalency between random vibration and sinusoidal vibration. However, are there are any empirical equations based on tests or analysis that provide "approximate" equivalency between random vibration and sinusoidal vibration ?





RE: Equivalency of random vibration and sinusoidal vibrat ion
RE: Equivalency of random vibration and sinusoidal vibrat ion
Aeq = Q*Ar
where Ar is the RMS random vibration response acceleration
and Q=[(0.5*(2pi)^.5)^(1/(lambda*alpha))*(lambda*alpha/e)^0.5]
where
lambda = a constant based on experimental data
alpha = slope of the fatigue curve when plotted in log-log coordinates
e = 2.718281828...
Long story short, Q = 2.14-2.17 (usually taken to be 2.14) for most metals.
Jeff Strain
jeff.strain@padtinc.com
Phoenix Analysis & Design Technologies