This paper present a new effective algorithm for the optimal realization of sampled-data SISO two order controller structures using the delta operator subject to Finite-Word-Length (FWL) constraints. The problem is fo...
详细信息
This paper present a new effective algorithm for the optimal realization of sampled-data SISO two order controller structures using the delta operator subject to Finite-Word-Length (FWL) constraints. The problem is formulated as a non-linear programming problem with a maximum of four independent variables to provide an easy and efficient optimization tool to solve such complex problems. Simulation results of the optimum FWL realizations of digital SISO two order controller structure applied to an electrohydraulic actuator system are presented to illustrate the effectiveness of the proposed strategy.
Active stabilization of stall instabilities in axial flow compressors is pursued using a combination of bifurcation analysis and nonlinear control. A low-order discretization model of a PDE compressor model is found t...
详细信息
Active stabilization of stall instabilities in axial flow compressors is pursued using a combination of bifurcation analysis and nonlinear control. A low-order discretization model of a PDE compressor model is found to exhibit a stationary (pitchfork) bifurcation at the onset of stall. Using throttle opening as a control, analysis of the linearized system at stall shows that the critical mode (zero eigenvalue) is unaffected by linear feedback. Hence, nonlinear stabilization techniques are necessary. A quadratic feedback control law is proposed based on the lower-order model and is found to adequately serve the control purposes for both the lower order and higher order discretizations.
暂无评论