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as.ghaith
Member

Join Date: Apr 2008
Posts: 5

Rise Time and Damping Ratio

05/13/2009 10:21 AM

hello i need help how to find the rise time when the dampingratio is not equal to0.5

i have this formula t = 1.8/damping ratio

but our lecturer accepts this only if the damping ratio is 0.5 what should i do i would be gratefuul if u help

thank you
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Guest
#1

Re: Rise Time and Damping Ratio

05/13/2009 10:31 AM

This may help.

http://en.wikipedia.org/wiki/Rise_time
Guest
#2

Re: Rise Time and Damping Ratio

05/13/2009 2:57 PM

i need more help i you could give something more specific to the subject and thank you very much for your time :)
jack of all trades
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New Zealand - Member - Kiwi Popular Science - Weaponology - New Member Engineering Fields - Power Engineering - New Member Engineering Fields - Electrical Engineering - New Member

Join Date: Sep 2006
Location: Auckland, New Zealand
Posts: 2656
Good Answers: 91
#3

Re: Rise Time and Damping Ratio

05/13/2009 4:04 PM

Have you checked your control and math text books for the answer? I find it a little hard to believe the answer is not in there (at least in a text explanation form). Have you looked at the following links also.....

http://en.wikipedia.org/wiki/Damping

http://en.wikipedia.org/wiki/Damping_ratio
WoodwardDL
Commentator

Join Date: Dec 2008
Location: Anthem, AZ
Posts: 62
Good Answers: 4
#4

Re: Rise Time and Damping Ratio

05/20/2009 10:08 PM

The rise time of a damped response can be calculated with this formula:

where ζ is the damping ratio and ωn is the natural frequency of the network.

This is extracted from Wikipedia.
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