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Vibration Perception
2

Vibration Perception

Vibration Perception

(OP)
I have a graph that has plotted on the x-axis Dynamic Amplitude and on the y-axis Frequency.

On the graph are two lines: SNAME line and CDG "D" line.

They divide the graph into Acceptable and Not Acceptable areas of vibration perception.

There are no references sited.  Can anyone shed light on references for the SNAME line and CDG "D" line?

RE: Vibration Perception

I don't know, but ask someone at SNAME (Society of Naval Architects and Marine Engineers)

RE: Vibration Perception

also, could you provide a bit of information on what you are trying to measure?  eg:  building vibration, bus & train, etc.

RE: Vibration Perception

(OP)
We have been asked by our client to quantify the vibration due to large compressor trains on some offshore platforms.  The workmen sometimes complain that the vibrations are excessive.  We can measure the frequency and the dynamic amplitude.  We can see where these fall on the graph.  We are interested in finding the source of the two lines dividing the areas on the graph in order to see what criteria was used for establishing these lines.  Ultimately, we need to determine if these complaints are justified, and if so, we will need to make recomendations to minimize the vibrations to an acceptable level.

RE: Vibration Perception

Habitability vibration criterion are provided in SNAME T&R Bulletin 2-25 and ISO 6954.

RE: Vibration Perception

In the off-chance that you haven't considered this, when you take your measurements, be sure to look at the phase relationships between the different compressors. It may be that when the "workmen sometimes complain" there are two or more compressors that are causing "beats".

RE: Vibration Perception

If you want to quantify the wholebody vibration (which is what you have for standing workers (or seated), ISO 2631 details the measurements and evaluation of wholebody vibration.

I have applied the criteria several times and found that the results correlate very well with my own response.  i.e. if it is rated very uncomfortable, I do not want to be standing in that area very long.

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