×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

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!

*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

Stationary Wavelet Transform Signal End Effects Issue

Stationary Wavelet Transform Signal End Effects Issue

Stationary Wavelet Transform Signal End Effects Issue

(OP)
Hi

I'm using SWT ('coif' and 'sym') to analyse model amplitudes of a vibrating beam with a small crack in it. I have been able to successfully use the plot of the detail difference coefficient to detect the location of the damage. However, both my approximation coefficient and detail coefficient plots show spikes at the ends of the signal.

The detail coefficient spikes are considerably larger than the deviation in signal caused by the presences of the crack. This results in the crack information being hidden due to plot scale. In addition, I have been unable to successfully de-noise the signal without removing the crack information.

Any help on eliminating this spikes or information on what might be causing them would be great.

Thanks.

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



News


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