Modified Approach of NaFA based on its Step Size and its Performance in Bioreactor Processes

S Meena; D Sankaran; M Nivethithadevi

doi:10.17485/IJST/v14i26.95

Article

Modified Approach of NaFA based on its Step Size and its Performance in Bioreactor Processes

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Indian Journal of Science and Technology

DOI: 10.17485/IJST/v14i26.95

Year: 2021, Volume: 14, Issue: 26, Pages: 2164-2174

Original Article

Modified Approach of NaFA based on its Step Size and its Performance in Bioreactor Processes

S Meena^1*, D Sankaran², M Nivethithadevi²

¹Associate Professor, Department of EIE, St. Joseph’s college of Engineering, OMR, Chennai, India
²Assistant Professor, Department of EIE, St. Joseph’s college of Engineering, OMR, Chennai, India

*Corresponding Author
Email: [email protected]

Received Date:17 January 2021, Accepted Date:14 July 2021, Published Date:30 July 2021

This work is licensed under a Creative Commons Attribution 4.0 International License.

Abstract

Objectives: The objective of this work is to fine tune the variant of FA (Firefly Algorithm), NaFA (Firefly Algorithm with neighbourhood Attraction) by parameter tuning such as a, b , g . Furthermore, a new variant called Step Size Modified FA with neighbourhood attraction (SSMFA-N) has been proposed in which the step size is updated during the algorithm run so that a balance between local and global search is achieved. The considered objective functions are PO and ITAE. Methods: It is well known that parameters that are considered initially for any metaheuristic algorithms are purely trial and error basis and this leads to erroneous optimized results. While analysing the algorithms, NaFA (a variant of FA) has been considered for efficient convergence and good performance. On analysing it is noticed that FA and its variants’ performances and convergence depend on Step Size(a), brightness (b ) and adsorption coefficient(g ). In both the FA and NaFA the parameters to be tuned for effective convergence are a, b and g . It is also understood that the parameter b had been done separately and the parameters a and g cannot be fine-tuned simultaneously. Therefore, in NaFA the parameter tuning for a has been done for the processes FOPDT, stable and unstable SOPDT and the new variant SSMFA-N is thus proposed. Findings: The algorithm is made to run in MATLAB and Simulink environment for three different processes such as FOPDT, Stable and Unstable Second order Process (bioreactor processes) with the objective functions of less PO and ITAE. The obtained results from all the three processes are compared with the conventional and optimization methods (PSO) and shown that SSMFA-N outperforms the conventional and optimization approaches in both the time domain and performance indices. Novelty: The novelty is the modification of step size of NaFA, which ultimately leads to a new variant called SSMFA-N.

Keywords: FA; FA with neighbourhood attraction; Step size tuning; Bioreactor Process

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Copyright

© 2021 Meena et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Published By Indian Society for Education and Environment (iSee)