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Vibration Analysis

Vibration Analysis

Vibration Analysis

(OP)

I would have thought this would be an easy issue to resolve but I may need a re-focus.

I have commissioned 40 Daikin VRV (variable refrigerant flow) fan coils on two floors with the requisite condensing appliances. The system is working like a charm. There are no vibration issues at this time. However...it is a LEED building and I need to provide some documentation to validate the anti-vibration efforts supplied by mechanical contractor and the manufacturer. The usual...rubber grommets at fan mounts, canvas connectors (supply and return), neoprene pads, etc...

I could simply design a form and sign it saying it met spec(a surprising very light spec)and be done with it.

My curiousity is getting the better of me here and I am asking if anyone is aware of a vibration primer for those of us in the HVAC&R industry.

This project is straightforward, but I have been in machine rooms with 16 of 10HP compressors all on isolating springs, vibrasorbers, etc...and the rooms nearby still have a low frequency hum to them.

I guess that is why some folks dedicate their time to vibration analysis.

Thank for any assistance

Tom

 

RE: Vibration Analysis

A pretty thorough overview of practical industrial vibration monitoring here:
http://www.update-intl.com/VibrationBook.htm

Needless to say, it would be helpful to determine the vibration of the hum and to take vibration measurements (including spectra)  on the machines and possibly bases below them to help see what's going on.  

=====================================
(2B)+(2B)'  ?

RE: Vibration Analysis

tbedford,

   Are you an engineer or a technician?  Vibrations are taught in college.  

               JHG

RE: Vibration Analysis

From my perspective, there are two completely different types of courses:

1 - University course in vibration which teaches us how to mathematically predict vibration for a given system.
2 – Vibration technician/analyst course (typically not university, but offered by Technical Associates, Entek, CSI, Vib Institute) - teaches practical aspects of diagnosing vibration symptoms in rotating machinery.

Neither one substitutes for the other.  You can certainly do more with both than with only one.

The link that I posted corresponds to the 2nd type.  It covers information roughly equivalent to a typical 40-hour vibration tech/analyst course. And it's free.
 

=====================================
(2B)+(2B)'  ?

RE: Vibration Analysis

(OP)


Thanks to all,

I am not an engineer...a technical type, refrigeration mechanic by trade.
The reference to earlier posts is most helpful.
I think one of the 5 day courses would be beneficial. Now I have to figure out how to get away for 5 days.

thanks again to all,

Tom  

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