Constrained Optimization by the α Constrained Particle Swarm Optimizer
Tetsuyuki Takahama*, and Setsuko Sakai**
*Faculty of Information Sciences, Hiroshima City University, 3-4-1 Ozukahigashi, Asaminami-Ku, Hiroshima 731-3194, Japan
**Faculty of Commercial Sciences, Hiroshima Shudo University, 1-1-1 Ozukahigashi, Asaminami-Ku, Hiroshima 731-3195, Japan
In this study, α constrained particle swarm optimizer αPSO, which is the combination of the α constrained method and particle swarm optimization, is proposed to solve constrained optimization problems. The α constrained methods can convert algorithms for unconstrained problems to algorithms for constrained problems using the α level comparison, which compares the search points based on the satisfaction level of constraints. In the αPSO, the agents who satisfy the constraints move to optimize the objective function and the agents who don’t satisfy the constraints move to satisfy the constraints. The effectiveness of the αPSO is shown by comparing the αPSO with GENOCOP5.0, and other PSO-based methods on some nonlinear constrained problems.