basics in vibrations
2

Question

basics in vibrations

NPL101 (visitor)

(OP)

3 Jan 02 16:18

I am a structural engineer and new in the area of vibrations. Can anyone suggest a good book for vibrations testing?. I need the basics on how to select accel positions, how to read the test data and how to refine the fem model so that it reflects the actual structure.

thanks
mzl2002

ANTOINE (Mechanical) · Answer 1 · 2002-01-04 08:40:43

I guess the Harris handbook of noise and vibration is a good start...The Beranek should be close to you too...

GregLocock (Automotive) · Answer 2 · 2002-01-04 12:43:59

Harris and Beranek are excellent, but they WON'T tell you where to put the accelerometers.

mzl's questions are very good, but are also very hard to answer. Accelerometers are usuallly placed in a fairly arbitrary fashion, towards the outer spatial limit of each component or sub-component.

The test data should be reduced to a set of mode shapes, frequencies, and damping values. This will allow direct comparison wih your FEA results (apart from the damping)

Modifying your FE model for good correlation: (1) DISCARD ALL RIGID ELEMENTS.

(2) do your statics work?

(3) are your masses OK?

Cheers

Greg Locock

bk33 (Mechanical) · Answer 3 · 2002-01-07 06:25:33

Dear mzl
Have a look at this site, there are some good information and basics about vibration .
good luck
http://web.ukonline.co.uk/d.stevens2/vibanalysis/index.html

BK33

GregLocock (Automotive) · Answer 4 · 2002-01-07 11:32:36

You get a star for that. One of the graphs looks a bit sus, but it is great to see real data on the net, and the explanations are grouse.

Cheers

Greg Locock

**NPL101** (visitor) · Answer 5 · 2002-01-15 09:37:48

RE: basics in vibrations

NPL101 (visitor)

(OP)

15 Jan 02 09:37

Thanks to all for your help!

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basics in vibrations
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