Please direct me if you have technical papers, design guidelines and special software that handles design/analysis of block-type foundations supporting heavy vibrating machinery.
Dear Mechanical Engineer,
What is the failure type?
What is the operating scenario in terms of turn around?
What is the piping lay out? Any differences?
These are just questions that you may start find reasons through the course of investigation.
Take Care
:-)
Dear Pavel2;
You can request Maintenance Planner to extract previous history file and list all cost applied.
If you do not have this privilege, estimate the down time in hours and labor time and contact the contract department to give your hourly rating and then add this to the bearing changes...
Dear Azimuddin,
*) Your vibration measurement is in mm/s which means that your out put parameter is velocity. Now if you are using an accelerometer to have this high frequency range (10-10,000 Hz), you need to integrate your acceleration signal to velocity. Now you need to check the type of...
Dear Consultant,
The Heavy Spot is the angular location of the imbalance (unbalance) vector at a specific lateral location on the shaft or the rotating element.
The High Spot is the angular location on the shaft or the rotating element directly under the vibration sensor at that point in time...
Dear cyw,
I am sure that butelja response was beneficial.
In the case of the unavailability of a computerized balancing machine, you need to see the response after the first trial weight. A good response is considered when you have 10-20 % change either in the amplitude or the phase angle. If...
Dear mbrett,
You can derive the acceleration in G as a function of the frequency in Hz giving the displacement either in mils or mm.
Are you referring to Grms or G's RMS?
In the first it is as stated be Tom is for random vibration (PSD) while the other is the RMS of the acceleration in G's/...
Dear SCHMIDT,
The Transfer function is not limited to relate Acceleration and Force. For example, you can relate force to velocity or force to displacement.
When you want to relate two signals that are of the same parameter then you should be after the amplitude ratio, the phase relation and...
Dear WIM32,
The instantaneous magnitude of any random vibration are specified only by probability distribution functions giving the probable fraction of the total time that the magnitude lies within specific range.
The Power Spectral Density is really the limiting mean-square value of the random...
Dear Bright_Engineering,
You are right that
w = 2 * Pi * Frequency (in Hz)
Or
w = 2 * Pi * rpm/60.
Now for your example, you used 30 Hz, which is equivalent to 1800 rpm.
Doing the simple calculation then
the displacement is 0.002488 in (zero-to-peak)
which is equal to 2.488 mils...
