Modifications and Improvements in a Structural Optimization Scheme Based on an Optimality Criterion.

摘要

Three optimization algorithms based on optimality criteria are compared with an algorithm based on mathematical programming. Two of the optimality-criterion algorithms are adapted from previous work and the third is new. The example problem used is a simple 12-design-variable rectangular wing with three separate equality behavioral constraints: a fixed deflection at the tip under a transverse load, a fixed fundamental free-vibration frequency, and a fixed subsonic flutter speed. Minimum-gage constraints were also imposed. All of the algorithms gave virtually identical optimal designs. The optimality-criterion algorithms were generally more efficient than the mathematical-programming algorithm, although comparisons with more complicated problems are needed to establish clearly the degree of superiority. The problems currently being considered are discussed, and the research plan for the next year is briefly described. (Author)