Design and experimental investigations of dynamic sliding-mode control strategy with dynamic sliding manifold for control systems

The chattering in control signal, response time, process parameter variability and stability are the issues in a classical sliding-mode control (SMC). The paper synthesises a dynamic sliding-mode controller (DySMC) to improve the performance of process control plants and thereby alleviating chattering effect. The stability condition is proven via direct Lyapunov candidate function. The proposed designs have been tested to temperature control system and second-order servo plant while real-time experimental tests are carried out for level control system. The efficacy of proposed design is assessed for four error-based performance indices. Simulation and experimental result reveals the superiority of proposed strategy over classical SMC, global SMC (GSMC) and normal terminal SMC (NTSMC) in terms of time-domain specifications, error-based performance indices, multiple reference-point tracking and disturbance rejection capability. The simulation and real-time experimental tests explore improvements in time-domain specifications and error-based performance indices.