| บทคัดย่อ(English) |
This research attempts to extend the operational range of a two-inertia system which is precompensated for torsional resonance. Its objective is to maximally utilize the system of which performance is limited by nonlinearity therein. Tabu Search (TS) plays an important role on the identification of such nonlinear characteristics. The thesis reviews the TS method, a kind of efficient stochastic search ones. The work proposes a new technique incorporated into the conventional TS for faster search performance and better avoidance of being trapped by local optimum solutions. The stability of the extended system is investigated using the describing function, the Popovs criterion, and the circle criterion methods, respectively. The modified TS results in a family of nonlinear saturation characteristics in the feedback path of the control loop. The upper and lower limits of these nonlinear characteristics are employed for the stability test. The speed output of the extended system can be increased by 55.94 % and the systems stability is guaranteed. |
