A decentralized static output feedback sliding mode control (DSOFSMC) is proposed for a class of nonlinear interconnected systems. A novel generalized regular form framework is first developed to specifically address interconnected systems that cannot be transformed into regular form. A nonlinear sliding surface is designed using only system output variables, and a sufficient condition that ensures the asymptotic stability of the sliding mode dynamics is presented. The proposed method guarantees finite-time convergence of the system to the composite sliding surface. Three simulation examples are provided to validate the effectiveness of the method, highlighting its robustness in handling uncertainties and interconnections while achieving strong system performance.
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