×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Sinusoidal testing with a shaker platform

Sinusoidal testing with a shaker platform

Sinusoidal testing with a shaker platform

(OP)
Hi there,
I am new to vibration testing. I want to test the resonance of a small lightweight object. I have a Controlled Vibration platform shaker:
https://controlledvibration.com/product-item/12-in...
And a laser doppler vibrometer to measure the velocity on the platform. I am using Audacity to create a 'chirp' signal to play through the shaker. The limits of the platform are 5 Hz- 2000 Hz. I do not know the resonance frequency of my test objects so I was going to sweep through that range.

Can anyone point me towards resources telling me EXACTLY how to do a sinuoidal test sweep please, in enough detail for someone who is new to the area? At the moment I am concerned about exceeding the limits of the shaker platform and causing damage, given the varying amplitudes at particular frequencies. The material I have read indicates that I need to input a signal with a 'ramp up' below the crossover frequency then with a plateau above that, but I am unsure how exactly to calculate this. Then once I have sorted the signal, I presume I am then just measuring on the object and looking at the waveform to see higher amplitudes- but how can I account for the varied amplitudes of the input signal?

The test does not have to be absolutely perfect but I would like to find the resonant frequencies of the object.

Any help or pointers to useful information would be greatly appreciated.

RE: Sinusoidal testing with a shaker platform

Not sure what you are asking. A sine sweep is basically a slow chirp, typically on the order of 1 octave/minute. You don't want it so slow that it essentially dwells on a resonance, only long enough to detect that all the resonances. A much slower sweep or dwell would be used to determine actual the level of the resonance.

TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers Entire Forum list http://www.eng-tips.com/forumlist.cfm

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Resources

White Paper - Smart Manufacturing for Electronics
This white paper describes a transformative approach to electronics manufacturing made possible by the addition of Mentor Graphics to the Siemens family. It describes a completely digitalized strategy that supports both printed circuit board (PCB) and mechanical design and manufacturing, uniting the entire product lifecycle – from idea and production to customers and back. Download Now
White Paper - Considerations for choosing a 3D printing technology
The adoption of 3D printing into major companies’ product development life cycles is a testament to the technology’s incredible benefits to consumers, designers, engineers and manufacturers. While traditional production methods have limitations in manufacturability, 3D printing provides unparalleled design freedom due to the additive method of building parts layer by layer. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close