Abstract
The dynamics of self-oscillators under stochastic excitation are of great interest for scientific and engineering purposes. In this study, we propose a method for computing continuous probabilistic solutions to stochastic oscillators developing into self-oscillation. We employ a physics-informed neural network to solve the transient Fokker-Planck equation that corresponds to the Langevin equation characterizing a stochastic self-oscillator. The proposed framework is parametrically demonstrated by varying linear and nonlinear coefficients, noise amplitude, and oscillation frequency. Furthermore, the robustness of the present method is verified with the time-marching numerical solution, which shows great agreement with the PINN-based solution.
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Acknowledgments
Hwijae Son was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT) (No. NRF-2022R1F1A1073732) and the research fund of Hanbat National University in 2022. Minwoo Lee was supported by NRF grant funded by MSIT (No. NRF-2021R1G1A1091278).
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Hwijae Son received his B.S. degree in mathematics from Hanyang University and Ph.D. degree from POSTECH in 2021. He is currently an Assistant Professor in the Department of Artificial Intelligence Software at Hanbat National University, Korea. His research interest is mainly focused on physics-informed machine learning and scientific computing.
Minwoo Lee received his B.S. and M.S. degrees in aerospace engineering from the Korea Advanced Institute of Science and Technology in 2012 and 2014, respectively, and a Ph.D. degree in mechanical engineering from the Hong Kong University of Science and Technology in 2020. He is currently an Assistant Professor in the Department of Mechanical Engineering at Hanbat National University, Korea. His major research interest is the data-driven analysis and low-order modeling of thermofluid systems.
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Son, H., Lee, M. Continuous probabilistic solution to the transient self-oscillation under stochastic forcing: a PINN approach. J Mech Sci Technol 37, 3911–3918 (2023). https://doi.org/10.1007/s12206-023-0707-z
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DOI: https://doi.org/10.1007/s12206-023-0707-z