Title :
Optimal control design approach based on a multipoint approximation method
Author :
Hancu, O. ; Maties, V. ; Balan, R.
Author_Institution :
Tech. Univ. of Cluj-Napoca, Cluj-Napoca
Abstract :
The paper proposes a control design approach based on a multipoint linearization method for linear electro-hydraulic servo systems. The nonlinear model - which includes the nonlinearities of friction forces, valve dynamics, oil compressibility and load influence - is developed by means of the associated differential equations. Based on some mathematical transformations and approximations, the model of servo system is reduced to a family of linear systems which can approximate the behavior of system on the whole operational domain. These models are used to design an optimal controller which modifies online the feedback control parameters. Simulation and experimental results are provided to show the effectiveness of approach.
Keywords :
approximation theory; control nonlinearities; control system synthesis; differential equations; electrohydraulic control equipment; feedback; linear systems; linearisation techniques; nonlinear control systems; optimal control; servomotors; differential equations; feedback control parameters; friction force nonlinearities; linear electrohydraulic servosystems; linear systems; multipoint approximation method; nonlinear model; oil compressibility; optimal control design approach; optimal controller design; valve dynamics; Approximation methods; Control design; Differential equations; Friction; Mathematical model; Nonlinear dynamical systems; Optimal control; Petroleum; Servomechanisms; Valves;
Conference_Titel :
Automation, Quality and Testing, Robotics, 2008. AQTR 2008. IEEE International Conference on
Conference_Location :
Cluj-Napoca
Print_ISBN :
978-1-4244-2576-1
Electronic_ISBN :
978-1-4244-2577-8
DOI :
10.1109/AQTR.2008.4588839
