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Shakedown analysis of trusses under cyclic thermal load with temperature-dependent yield stress
S.Y. Leu,Y.H. Chen,K.C. Liao 국제구조공학회 2021 Structural Engineering and Mechanics, An Int'l Jou Vol.78 No.6
The paper aims to revisit shakedown analysis involving temperature-dependent yield stress. Formulations and numerical implementations are focused on truss structures subjected to cyclic thermal and constant mechanical loads. In particular, a systematic approach based on the duality relationship of l∞-norm and l1-norm is established to state the dual formulations for static and kinematic shakedown analysis of truss structures. Illustrative examples are involved statically indeterminate three-bar and five-bar trusses, respectively. Numerical effort is made to acquire shakedown limit temperature by using the linprog function provided by MATLAB. Furthermore, the finite-element analysis using ABAQUS is also performed for rigorous comparisons.
Fuzzy PI-type current controllers for permanent magnet synchronous motors
Jung, J-W,Choi, Y-S,Leu, V Q,Choi, H H IET 2011 IET electric power applications Vol.5 No.1
<P>This study proposes a robust fuzzy PI-type current controller for a permanent magnet synchronous motor (PMSM). The proposed current control law consists of two control terms: a decoupling control term and a fuzzy PI control term. The decoupling controller accounts for the non-linearity of a PMSM model, and the fuzzy PI controller stabilises the decoupled dynamics. Based on Kharitonov's theorem, the stability condition, which can guarantee the asymptotic stability of the closed-loop system, is derived. Simulation and experimental results are presented to demonstrate the feasibility of the proposed control scheme using a prototype 1 HP PMSM servo system.</P>