Superiority of fractional order controllers in limit cycle suppression
by Ameya Anil Kesarkar; N. Selvaganesan
International Journal of Automation and Control (IJAAC), Vol. 7, No. 3, 2013

Abstract: In this paper, we report an interesting advantage of fractional order controllers over integer order ones. It is found that the three-parameter-fractional-controllers such as PI^α and [PI]^α outperform integer PID in limit cycle suppression when designed to meet Wang et al. specifications. An elementary servo plant having separable static backlash non-linearity in its model is considered for the tuning purpose. For this plant, designed PI^α and [PI]^α produce significantly reduced limit cycles in the closed loop non-linear simulation response as compared to PID. The results are further verified with describing function method. Also, the results exhibiting such a 'fractional superiority' for a real time application of precision modular servo experimental set-up are included for the better illustration.

Online publication date: Sat, 12-Jul-2014

The full text of this article is only available to individual subscribers or to users at subscribing institutions.

 
Existing subscribers:
Go to Inderscience Online Journals to access the Full Text of this article.

Pay per view:
If you are not a subscriber and you just want to read the full contents of this article, buy online access here.

Complimentary Subscribers, Editors or Members of the Editorial Board of the International Journal of Automation and Control (IJAAC):
Login with your Inderscience username and password:

Username:        Password:          Forgotten your password?

Want to subscribe?
A subscription gives you complete access to all articles in the current issue, as well as to all articles in the previous three years (where applicable). See our Orders page to subscribe.

If you still need assistance, please email subs@inderscience.com