Estimation of Disturbances by using Adaptive Fuzzy for SISO System

International Journal of Electrical and Electronics Engineering
© 2018 by SSRG - IJEEE Journal
Volume 5 Issue 10
Year of Publication : 2018
Authors : Embeti Sangeetha and T.Manohar
How to Cite?

Embeti Sangeetha and T.Manohar, "Estimation of Disturbances by using Adaptive Fuzzy for SISO System," SSRG International Journal of Electrical and Electronics Engineering, vol. 5,  no. 10, pp. 12-16, 2018. Crossref,


Estimating disturbances /unknown inputs of a system based on adaptive fuzzy output is proposed for a original Adaptive Fuzzy observer for estimating the unknown and nearly periodic input LTI SISO discrete time system. It does not involve inverting the open loop system model, Therefore it can be applied to both minimum- phase and non-minimum phase systems.However, for this approach to be exact, the parallel compensator must have almost zero gain in the frequency range of the disturbance/unknown input. The effectiveness of the proposed observer design is assessed by a numerical example including model error and measurement noises, using Matlab/ Simulink software.


DOB/UIOB (disturbance/ unknown input observer), Adaptive Fuzzy systems, filtering.


[1] T.Umeno, T. Kaneko, and Y. Hori, ―Robust servosystem design with two degrees of freedom and its application to novel motion control of robot manipulators,‖ IEEE Transactions on Industrial Electronics, vol. 40, no. 8, pp. 473–485, 1993. 
[2] D.K¨onig, S. Nowakowski, and A. Bourjij, ―New design of robust observers for fault detection and isolation,‖ in Proceedings of IEEE Conference on Decision and Control, pp. 1464–1467, 1996. 
[3] W.Chen, and M. Saif, ―Fault detection and isolation based on novel unknown input observer design,‖ in Proceedings of American Control Conference, pp. 5129–5134, 2006. 
[4] D.M.Trujillo and H. R. Busby, Practical Inverse Analysis in Engineering. CRC Press, 1997. 
[5] J.C.Santamarina and D. Fratta, Discrete Signals and Inverse Problems: An Introduction for Engineers and Scientists. John Wiley and Sons, Ltd., 2005. 
[6] A.Radke and Z. Gao, ―A survey of state and disturbance observers for practitioners,‖ in Proceedings of the 2006 American Control Conference, (Minneapolis, Minnesota, USA), pp. 5183–5188, 2006. 
[7] S.Li, H. B. Sun, J. Yang, and X. H. Chen, ―Disturbance-observer-based control and related methods — an overview,‖ IEEE Transactions onIndustrial Electronics, vol. 63, no. 2, pp. 1083–1095, 2016. 
[8] Y.I.Son, H. Shim, N. H. Jo, and S. J. Kim, ―Design of disturbance observer for non-minimum phase systems using PID controllers,‖ in Proceedings of 2007 SICE Annual Conference, (Takamatsu City, Kagawa, Japan), pp. 196–201, 2007. 
[9] H.Shim, N. H. Jo, and Y. I. Son, ―A new disturbance observer for nonminimum phase linear systems,‖ in Proceedings of the 2008 American Control Conference, (Seattle, Washington, USA), pp. 3385–3389, 2008. 
[10] M.-S.Chen, S.-Y. Lin, M.-L. Tseng, Y.-L. Yeh, and J.-Y Yen, ―Robust state-and-disturbance observer design for linear non-minimum-phase systems,‖ sian Journal of control, vol. 18, no. 4, pp.1–7,2016.