Just after the external defense of his Masters in Engineering research project on “Control Systems Engineering” held on the 23rd day of October, 2015, at the Postgraduate School (PGS), Federal University of Technology, Owerri, Nigeria (FUTO), Orji, Williams Ukaegbu (aka Williams Fishers) could not wait for the convocation ceremony held on December 5, 2015.
The abstract of the Orji, Williams Ukaegbu’s M.Eng. Control Engineering Thesis at FUTO is as follows:
This research report is centred on performance analysis of Smith Predictor and Proportional-Integral-Derivative (PID) controllers in servomotor speed control application. Servomotor speed control system has proven to exhibit problem of time lags emanating from analysis, measurement, transportation, computation and communication when using conventional controller.
This problem leads to increased system dynamic error and affects system stability as evident in engineering and industrial process control. Therefore, this heuristic research was done using interactive hybridization of traditional PID controller and Smith Predictor technique to reduce inherent transcendental time delay from systems transfer function.
From the simulation results, non-hybridised controller has a very large settling time of 16.1s with less overshoot when a static load disturbance was used. The rise and peak times showed that the PID controller was able to compensate for time delay upto 2s. On the other hand, the dynamics of the hybridised controller with large time delay of 94s was designed to match with the process model. This successfully eliminated long deadtime from the system model.
The Smith Predictor hybrid compensated for all iterations of time delay ranging from 2s to 94s with 1s settling time and less over shoot. The controller designed in this work with improved time-delay compensation and method of tuning may help in making speed control specifications to be optimally regulated for reliable performance.
Hence, it is recommended that hybrid predictive controllers be improved to ensure large deadtime compensation in servomotor speed control to drive industrial and engineering processes reliably.
Key words – Speed Control, Smith Predictor, PID, Servomotor, Time-delay, MatLab/Simulink
Throughout his period of study, Orji Ukaegbu has made some scholarly publications, the titles and links to access the articles are shown below:
. Performance analysis of smith predictor and proportional-integral-derivative in seromotor speed control
. Performance Analysis of Linear Quadratic Regulator Controller Design Techniques for Optimal Servomotor Speed Control
. Sonar Fish Detection and Measurement System with PIC16F873
The item  is the first publication of Orji Ukaegbu’s thesis with International Journal of Scientific Research & Development (IJSRD – www.ijsrd.com).
In addition to this, Orji Ukaegbu lectured and presented a paper during the 5th Annual & International Conference of the Renewable & Alternative Energy Society of Nigeria (RAESON), held on 17th – 20th June, 2015 held at Gregory University, Uturu, Abia State.
Orji Ukaegbu is a native of Igbere, Bende LGA, Abia State.
Orji, Ukaegbu may be reached via the following contact information:
ORJI, Williams Ukaegbu
Department of Electrical/Electronic Engineering,
School of Engineering and Engineering Technology,
Federal University of Technology,
P.M.B. 1526, Owerri, Imo State, Nigeria.