vibration analysis

[Guido]

Hello, guys.

my client wants to equip himself to perform vibrational analysis on electro-welded structures.
I don't have much experience about it, so I told him I'd be informed, and here I am.

In practice, from what I understand, he searches for a laboratory tool with which to test on metal structures in the frequency range from 10hz to about 5000hz.

I have seen that there are very interesting triaxial transducers on the market to detect vibrations (and related software) but I have not found a "generator" instrument of vibrations.

Can anyone help me?

Thank you.
guide

 

[PaoloColombani]

magnetostrictive alloys are used, but I see that the frequencies are low, then a "voice coil" might be good. 5000 hz turns out to me a bit 'altina to use a scooter with eccentric mass (e.g. cell phones).

 

[zeigs]

depends on what you want to do. In principle a hammer is a great vibration generator, for lower cost. if it is better instrumented, but it costs much more
if you have to keep the structure under a forceful at a well defined frequency (or with different frequencies) then you have to get a vibrator. for thatel frequense pernso that an electromechanical and piezoelectric should act for purpose
I don't know how great your structures are, but at the time in the faculty I have seen in the laboratory several highlands of various measures adapted to the purpose

I admit that looking for vibrators on google does not immediately lead to the expected results:tongue:

 

[Guido]

Well, you could try applying one...:biggrin:

jokes aside, the structures are small and stand on a 2000 x 1000 match table.

the customer would like to recreate in the laboratory the effect generated by a "heat" moved by an eccentric while it is in operation.

I don't know how and where to guide me. Any brand?

I remember seeing once, in a lab of metrology, a box from which a hammer used to hit on a cast iron structure and then sensors to detect.... but it was something very old judging by the classic amperometer years 50/60 used (I think) to adjust the frequency... .

guide

 

[Fulvio Romano]

Um... an amperometer to adjust the frequency.. .
and the valves for what do they use them for? to read the range?

a scooter with an eccentric should do for you. there are very fast engines, for example:http://www.emoteq.com/products/or even voice coils.


or these:
<http: index.php?option="com_content&view=article&id=54&itemid=11" italiano="" www.novarossi.it="">who also arrive at 50,000 rpm... but are not electric. . .</http:>

 

[Guido]

I don't know...:smile:

but often the amperometers are used for a multitude of measurements or maybe it was a voltmeter in parallel to a shunt resistance....

guide
ps: what is a voice coil?

 

[meccanicamg]

Good evening, everyone.
the vibration generator par excellence consists of an electromagnet driven by its control box. it is necessary a rigid fixed part on the ground, the magnet anchored to it and the metal structure is to be attracted and rejected. you must build a minimum of equipment and above all you will need to build an elastic system where to mount the structure to allow the oscillations.

to give you an idea look for linear vibrators or vibropowers, they are the solution (in small) of a vibration induction system. normally make maximum 6000 vibrations/min... but you have to see them specifically.

It's an idea... then you have to see masses in play, clutter, magnet forces etc.

 

[Fulvio Romano]

Um... an amperometer to adjust the frequency.. .
and the valves for what do they use them for? to read the range?

I don't know...:smile:
but often the amperometers are used for a multitude of measurements or maybe it was a voltmeter in parallel to a shunt resistance....

I was ironic. The amperometer is a transducer, law, not implemented. a valve is an actuator, implemented, not read.. .

guide
ps: what is a voice coil?

what explained mechanicalmg in the previous post. in practice a speaker, but dimensioned as an actuator

 

[michele81]

You practically need an electrodynamic shaker. . .
I think they're doing this.www.belotti-online.it

 

[Guido]

thanks for the info

guide