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A novel theorem on motion stability

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  • Tavakolpour-Saleh, A.R.

Abstract

Determination of stability and instability of singular points in nonlinear dynamical systems is an important issue that has attracted considerable attention in different fields of engineering and science. So far, different well-defined theories have been presented to study the stability of singular points among which the Lyapunov theory is well-known. However, the instability problem of singular points has been neglected to some extent despite its application in oscillator design. Besides, it is often difficult to achieve a proper Lyapunov function for a given complex system. This work first presents a novel theorem based on defining two distinct functionals and some straightforward criteria to study motion stability that significantly facilitates the determination of equilibrium status at singular points of 2ed-order systems without the requirement for the analytical solution. Indeed, this method is applicable to both stability and instability problems of linear and nonlinear dynamical systems. In addition, the presented theorem is further extended to achieve a new linearization approach based on averaging technique, which is superior to the Jacobian method. Lastly, the proposed linearization method is generalized to study the stability/instability of higher-order nonlinear systems. The obtained results clearly show the effectiveness of the Tavakolpour theorem on motion stability to assess the equilibrium status of fixed points.

Suggested Citation

  • Tavakolpour-Saleh, A.R., 2021. "A novel theorem on motion stability," Chaos, Solitons & Fractals, Elsevier, vol. 153(P2).
    • Handle: RePEc:eee:chsofr:v:153:y:2021:i:p2:s0960077921008808
    DOI: 10.1016/j.chaos.2021.111526
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    References listed on IDEAS

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    1. Zhou, Ping & Hu, Xikui & Zhu, Zhigang & Ma, Jun, 2021. "What is the most suitable Lyapunov function?," Chaos, Solitons & Fractals, Elsevier, vol. 150(C).
    2. Tavakolpour-Saleh, A.R. & Zare, Shahryar, 2019. "An averaging-based Lyapunov technique to design thermal oscillators: A case study on free piston Stirling engine," Energy, Elsevier, vol. 189(C).
    3. Zare, Shahryar & Tavakolpour-Saleh, A.R., 2020. "Predicting onset conditions of a free piston Stirling engine," Applied Energy, Elsevier, vol. 262(C).
    4. Zare, Sh. & Tavakolpour-Saleh, A.R., 2016. "Frequency-based design of a free piston Stirling engine using genetic algorithm," Energy, Elsevier, vol. 109(C), pages 466-480.
    5. Tavakolpour-Saleh, A.R. & Zare, Sh. & Omidvar, A., 2016. "Applying perturbation technique to analysis of a free piston Stirling engine possessing nonlinear springs," Applied Energy, Elsevier, vol. 183(C), pages 526-541.
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    1. Zare, Shahryar & Tavakolpour-Saleh, A.R. & Binazadeh, T., 2023. "Analytical investigation of free piston Stirling engines using practical stability method," Chaos, Solitons & Fractals, Elsevier, vol. 167(C).
    2. Sangdani, M.H. & Tavakolpour-Saleh, A.R., 2025. "Assessment of frequency and stroke in three-stage liquid-piston thermoacoustic Stirling engines via a new approach: Analysis and experiment," Energy, Elsevier, vol. 315(C).

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