POSITION CONTROL FOR AN SMA ACTUATOR BASED ON INVERSE MODEL FOR COMPENSATION
Published In: INTERNATIONAL CONFERENCE ON ADVANCES IN CIVIL, STRUCTURAL AND MECHANICAL ENGINEERING
Author(s): HIROYUKI HARADA , JUNFENG LI
Abstract: In this paper, a feedforward-feedback controller is used to control the position of an SMA actuator based on a modified Liang and Rogers inverse model, considering both the major and minor hysteresis loops. First a modified Liang and Rogers model of an SMA wire actuated by an electric current is derived and experiments are used to validate the model and to identify the parameters governing its behavior. Then the feedforward part of the proposed control system, which is based on this inverse model, is used to compensate the hysteresis effect, and a PID controller is added to the feedforward controller to increase the accuracy as well as reduce the steady state errors in the position control process. Experimental results demonstrate that the proposed control system performs better than when only a traditional PID controller is used.
- Publication Date: 04-Aug-2013
- DOI: 10.15224/978-981-07-7227-7-14
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A COMPARISON OF METAHEURISTICS IN STRUCTURAL OPTIMIZATION
Published In: INTERNATIONAL CONFERENCE ON ADVANCES IN CIVIL, STRUCTURAL AND MECHANICAL ENGINEERING
Author(s): OGUZHAN HASANCEBI , SAEID KAZEMZADEH AZAD
Abstract: In the recent decades metaheuristic search techniques have been widely employed for developing structural design optimization algorithms. Amongst these techniques are genetic algorithms, simulated annealing, evolution strategies, particle swarm optimization, tabu search, ant colony optimization, harmony search, big bang-big crunch, and bat-inspired search. The main concern of the study is to evaluate the performance ofaforementioned nine techniques in discrete sizing optimization of structural systems. The optimization algorithms, which are implemented in an unbiased coding platform, are evaluated and compared in terms of their solution accuracies and reliabilities using a real size structural design instance. Here, the design criteria imposed by AISC-ASD (Allowable Stress Design Code of American Institute of Steel Construction) are considered in the course of optimization. The study provides general guidelines about the efficiency of investigated algorithms in practical structural opt
- Publication Date: 04-Aug-2013
- DOI: 10.15224/978-981-07-7227-7-15
- Views: 0
- Downloads: 0