Drexel dragonThe Math ForumDonate to the Math Forum



Search All of the Math Forum:

Views expressed in these public forums are not endorsed by Drexel University or The Math Forum.


Math Forum » Discussions » Software » comp.soft-sys.matlab

Topic: simmechanics: ground excited model
Replies: 1   Last Post: Mar 18, 2013 4:16 AM

Advanced Search

Back to Topic List Back to Topic List Jump to Tree View Jump to Tree View   Messages: [ Previous | Next ]
pietro

Posts: 374
Registered: 1/3/09
Re: simmechanics: ground excited model
Posted: Mar 18, 2013 4:16 AM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

"pietro " <bracardi82@email.it> wrote in message <khnlfr$1no$1@newscl01ah.mathworks.com>...
> Hi all,
>
> I'm just trying to develop a ground excited model of single degree of freedom model. The excitation is in terms of displacement. Here you can see the model.
>
> http://imageshack.us/f/820/modelqg.png/
>
> I get a huge spike of the body acceleration in the beginning of the simulation. The problem arises from the double integration of the displacement, i.e. the sine wave block. Infact after the first derivative a discontinuity of the first derived signal, as you can see in this plot:
>
> http://img829.imageshack.us/img829/3527/signals.png
>
> the purple signal is the one of the sine wave block output and the yellow one is of the first derivative block output. As you can see there is the discontinuity. How could I fix this problem?
>
> Thanks
>
> cheers
>
> Pietro


Any help is appreciated

Thanks



Point your RSS reader here for a feed of the latest messages in this topic.

[Privacy Policy] [Terms of Use]

© Drexel University 1994-2014. All Rights Reserved.
The Math Forum is a research and educational enterprise of the Drexel University School of Education.