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Help: Find natural frequncy using Picoscope

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Help: Find natural frequncy using Picoscope

Postby mint8577 » Thu Apr 19, 2012 9:40 am

Hi everyone,
I am currently doing a final year project. I have a specimen of mild steel which the dimension in 200mm x 50 mm x 10mm.
My problem is i do not know how to find the natural frequency for mode 1 to mode 4 of my specimen. I totally dont have any idea how to acquire the data by using picoscope.

My equipments are Picoscope 3224 with 2 channels,an accelerometer, an exciting hammer and picoscope software.(I attach channel A for accelerometer and channel B for hammer).

All comments, opinions and suggestions are welcome. Thanks
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Re: Help: Find natural frequncy using Picoscope

Postby Martyn » Mon Apr 23, 2012 10:36 am

Not our area of experise, sorry.
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Re: Help: Find natural frequncy using Picoscope

Postby cryogene » Wed Feb 12, 2014 9:28 pm

Hello mint8577,
Were you able to find out any more on your problem?
I have a similar setup with similar hardware and am also seeing if it's possible to view any more than just a spectrum display from the accelerometer feedback. Would really be nice to see the mode shapes, if possible.
Thanks for any feedback.
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Re: Help: Find natural frequncy using Picoscope

Postby M.Heide » Wed Feb 19, 2014 10:43 am

cryogene wrote:Hello mint8577,
Were you able to find out any more on your problem?
I have a similar setup with similar hardware and am also seeing if it's possible to view any more than just a spectrum display from the accelerometer feedback. Would really be nice to see the mode shapes, if possible.
Thanks for any feedback.


For the mode shapes a stationary wave you are going to need more than one sensor to acquire the spacial distribution of the mode. You could also have a constant source (automated hammer) and displace the sensor manual over the area.

I use a laser vibrometer with a scanning mirror system in front of it to acquiring vibration of an area.

Cheers,
Marcus
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Re: Help: Find natural frequncy using Picoscope

Postby cryogene » Wed Mar 19, 2014 9:36 pm

Thanks M.Heide!
Sorry been a while since I last checked in. Appreciate the response, will check into the laser vibrometer.
Apologies to Martyn for the off-topic reply.
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