Robust stabilization of axial flow compressor dynamics via sliding mode design

Issues of the robust stabilization for axial-flow Compressor dynamics with respect to the uncertainty in axisymmetric characteristics are presented. T his is achieved by the design of sliding mode controllers. By assuming an a ctuation directly modulating the mass flow such as the close-coupled valve, the domain of attraction for the unstalled operating equilibrium will be e nlarged to a great extent. Nonlocal robust stability of the operating equil ibrium, with respect to the uncertainty in the unstable branch of axisymmet ric compressor characteristic, is also provided by the proposed control law s. Moreover, it is demonstrated that the robust control scheme can be emplo yed to fulfill the task of stall recovery. The proposed stabilization desig n does not require an explicit fin-in for compressor characteristic.