The problem of integral sliding mode control (ISMC) with passivity is investigated for a class of uncertain neutral systems with\ntime-varying delay (NTSTD) and external disturbance. The system states are unavailable. An ISMC strategy is proposed based on\nthe state estimate. By employing a novel sliding functional, a new sufficient criterion of robust asymptotic stability and passivity for\nboth the error system and the sliding mode (SM) dynamic system is derived via linear matrix inequality (LMI) technique.Then,\na SM controller is synthesized to guarantee the reachability of the sliding surface predefined in the state estimate space. Finally, a\nnumerical example shows the feasibility and superiority of the obtained result.
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