Journal of Hydrodynamics

, Volume 31, Issue 2, pp 333–344 | Cite as

Multi-objective optimization of the kinematic parameters of fish-like swimming using a genetic algorithm method

  • Mahdi Abolfazli Esfahani
  • Hamid Reza Karbasian
  • Kyung Chung KimEmail author


This paper investigates the kinematic optimization of fish-like swimming. First, an experiment was performed to detect the motion of the fish tail foil of a fish robot. Next, the kinematic swimming model was verified experimentally using an image processing method. The model includes two rotational motions: caudal foil motion and foil-pitching motion. The kinematic model allows us to evaluate the influence of motion trajectory in the optimization process. To optimize the propulsive efficiency and thrust, a multi-objective genetic algorithm was employed to handle with kinematic, hydrodynamic, and propulsion models. The results show that the caudal length has a significant effect on the performance of the flapping foil in fish-like swimming, and its influence on the motion trajectory may increase the propulsive efficiency to as high as 98% in ideal conditions. The maximum thrust coefficient can also reach approximately 3 in ideal conditions.

Key words

Fish-like swimming fish robot hydrodynamics optimization genetic algorithm 


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This research was supported by the International Research and Development Program of the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT of Korea (NRF-2017K1A3A1A30084513) and partial support was also obtained from the National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT) (Grant Nos. 2011-0030013, 2018R1A2B2007117).


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Copyright information

© China Ship Scientific Research Center 2018

Authors and Affiliations

  • Mahdi Abolfazli Esfahani
    • 1
  • Hamid Reza Karbasian
    • 2
  • Kyung Chung Kim
    • 2
    Email author
  1. 1.Department of Electrical and Electronics EngineeringNanyang Technological UniversityNanyangSingapore
  2. 2.School of Mechanical EngineeringPusan National UniversityPusanKorea

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