Abstract
This study delves into finite-time projective synchronization within a thermal mechanical fractional-order system in the presence of external disruptions and uncertainties. The investigation utilizes a developed sliding mode surface and employs the Lyapunov approach to synchronize trajectories. Furthermore, the study explores three alternative fractional complex and real control rules employing Lyapunov functions, resulting in the formulation of a hybrid controller based on switching laws. Recognizing the escalating demand for efficient controllers, the research addresses the imperative to consider interruptions, uncertainties, and control input limits. To address this challenge, a novel disturbance-observer-based fractional-order sliding mode control technique is introduced, specifically designed to stabilize a fractional-order hyper-chaotic system. This method accommodates uncertainty, disturbances, and control input saturation. The research analyzes the system’s characteristics, including Lyapunov exponents, bifurcation diagrams, phase portraits, and time series of state vectors. Finally, numerical simulations underscore the potential and robustness of the proposed technique for uncertain five-dimensional systems, confirming its effectiveness.
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Abbreviations
- \(\beta \) :
-
Define operator of fractional order
- v :
-
Nanofluid velocity
- P :
-
Represents that pressure
- \({\tilde{\rho }}\) :
-
Represents density
- \({\tilde{\mu }}\) :
-
Represents viscosity
- \({\tilde{T}}\) :
-
Temperature
- \({\tilde{D}}_{\text {B}}\) :
-
Defined Brownian diffusion term
- \({\tilde{D}}_{{\tilde{\text {T}}}}\) :
-
Thermophoretic diffusion term
- Pr:
-
Prandtl number
- \(R_n\) :
-
Concentration of Rayleigh number
- \({\mathbb {N}}_B\) :
-
Modified density ratio
- \({\mathbb {N}}_A\) :
-
Modified diffusivity ratio
- \({\mathbb {V}}_1\) :
-
Lyapunov function
- \(\digamma \) :
-
Positive finite gain
- \(\textbf{q}\) :
-
Velocity vector
- \({{\text {Rn}}_{f}}\) :
-
Rescaled thermal Rayleigh number
- t :
-
Dimensionless time components
- (u, v, w):
-
Component of velocity vector
- x, y, z :
-
Cartesian coordinates
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Surendar, R., Muthtamilselvan, M. Sliding Mode Control on Finite-Time Synchronization of Nonlinear Hyper-mechanical Fractional Systems. Arab J Sci Eng (2024). https://doi.org/10.1007/s13369-024-08858-1
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DOI: https://doi.org/10.1007/s13369-024-08858-1