Multiobjective Technique in Constraints Handling GA for Electro-Thermal Microactuator Optimization

Autor: Yu-De Su, 蘇育德
Rok vydání: 2011
Druh dokumentu: 學位論文 ; thesis
Popis: 99
The quantity of violation in constraints is simulated to the concept of gene pathological change in biological system. The violation of all constraints is transformed to an artificially second design objective required to be minimized simultaneously. Consequently, the original objective integrated with such artificial objective to construct a two-objective in design optimization problem. A unique Pareto point can be sequentially obtained in which the value of second objective will converge to zero. This thesis presents the complete numerical algorithm and process in dealing with such a genetic revolution based optimization method. Some illustrative problems are solved and compared with that in published papers. Another topic in this thesis is the development for the optimization of electro-thermal microactuator and the application using constrained GA presented in this thesis. The design objective is the maximization of the deflection on a working point that corporate with a upper temperature limitation. Four models of electro-thermal microactuator are explored. The first category contains three models of single hot arm: constant length model, constant width model, and variable length/width model. The fourth model is double hot-arm model. The structural material volume, design deflection, and temperature influence are primary study items. Each model has its own feature that can be applied on particular situation. The optimum operating voltage can be obtained during the proposed solution process. In general, double hot-arm model results in the largest expected displacement; however, it requires a larger amount material than other model.
Databáze: Networked Digital Library of Theses & Dissertations