Integral sliding mode controller for pressure stabilization in hydrodynamic system with hydraulic accumulator

A hydrodynamic system with pressurized tank is modeled for flow meter calibration which has excellent advantages in laboratory application over the water-tower system, broadly used in the industrial calibration application; however, such system meets challenges of fluid flow stabilization and pressure noise absorption. While previous approach to deal with such problems is based on complicated mechanical method which is hard to master, present paper contributes a new novel method based on integral sliding mode control strategy to design a feedback controller to asymptotically and robustly stabilize the hydraulic pressure even within the system uncertainty and, moreover, hydraulic accumulator is investigated to absorb the pressure pulsation by unsteady fluid flow as well as the chattering of the sliding mode control. Simulation shows the validity and robustness of the proposed controller within the system uncertainty as well as the accumulator absorption of pressure pulsation. Moreover, analysis of the sliding mode parameter is addressed in this paper which is important in control design.