Analysis of System Stability using Bode and Nyquist Criteria for Recycling Used Engine Oil in KSA

Analysis of System Stability using Bode and Nyquist Criteria for Recycling Used Engine Oil in KSA
  IJETT-book-cover           
  
© 2025 by IJETT Journal
Volume-73 Issue-7
Year of Publication : 2025
Author : Salah Eldeen F. Hegazi
DOI : 10.14445/22315381/IJETT-V73I7P136

How to Cite?
Salah Eldeen F. Hegazi, "Analysis of System Stability using Bode and Nyquist Criteria for Recycling Used Engine Oil in KSA," International Journal of Engineering Trends and Technology, vol. 73, no. 7, pp.479-483, 2025. Crossref, https://doi.org/10.14445/22315381/IJETT-V73I7P136

Abstract
Reusing used engine oil is essential for resource conservation and environmental sustainability. Control systems are critical to the operations of these recycling systems. Via the application of chemical treatment and control systems engineering, the current research plugs an important gap in the literature. It focuses on investigating the responsiveness and stability of a PID-controlled system utilized in the acid-based recycling of used motor oil. By regulating the yield and maintaining the qualities and specifications near the base oil specification during the experiment, the treatment process was carried out at a constant 45°C. This paper focuses on applying a control scheme to manage the acidic strategy of recycling used engine oil. Meanwhile, we monitored and adjusted the oil density, viscosity, and temperature. Simulink was used to construct the experiment. MATLAB software’s toolbox was utilized to estimate the transfer function for recycling old engine oil through system identification using a graphical user interface approach. The stability analysis was examined using the Bode and Nyquist diagrams. The results showed that the gain margin is predicted to be 29.8 dB at a phase of 180 ° using the Bode diagram. The system’s max gain is assessed to be 14.7dB, which provides insight into the system’s tendency to overshoot in the time domain response. In addition to estimation, the peak gain and gain margin were established as the minimum, and all stability regions were explored using a Bode diagram. Furthermore, the analysis was performed using the Nyquist diagram, and the findings revealed a phase margin of 166 degrees and a peak gain of 14.7 dB. In conclusion, control system analysis utilizing Bode plots and Nyquist diagrams is critical for optimizing the recycling process of used engine oil.

Keywords
Stability, Frequency, Acidic, Transfer function, Bode plot, Nyquist criterion identification, Control system.

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