In AS1418 Cl 4.5.3.3 there is a table categorizing hoisting application group for cranes (H1 to H4). One of the properties is the fundamental natural frequency of structure (vertical plane)- see table below.
However the standard do not discuss much about this "vertical plane fundamental natural...
How does one accurately measure the effective dynamic load in frequency domain exerted by heavy equipment (huge vacuum pump, multistage centrifugal pump, and etc.) transmitted to arbitrary floor without reallocating the equipment?
One method I can think of is to work out the FRF of the floor at...
As pointed out in the old thread below, it's sort a norm to use 1/3 octave band for environment vibration assessment.
"One-Third-Octaves for Dummies"
Link
The bandwidth increases as central frequency so spectral leakage in high frequency band (>20Hz)is not a concern.
But then it come to very...
Lately I have came across a vibration design criteria with 1/3 Octave Band. Been doing a lots of dynamic analysis on narrowband but this 1/3 octave band is rather new to me. Some suggest we assign narrow band amplitude (fixed interval) into octave bin and sum them, some suggest to average them...
