Structural Optimization with Stiffness and Frequency Constraints

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Abstract
Automated preliminary design algorithms for large aerospace structures require an efficient and reliable method to economically minimize weight, while satisfying multiple types of constraints. Often structural optimization is started with a few cycles of Fully Stressed Design, using the stress ratio method, because of its simplicity and computational efficiency. The present approach is to generalize more sophisticated optimality criteria for more than one type of constraint. The goal is to account for more than just stress constraints, while retaining the computational efficiency of the simple stress ratio method. Previous optimality criteria methods for static and frequency constraints are combined in a new algorithm that handles both types of constraints simultaneously. Two trusses and one wing structure are used to demonstrate the validity of an Optimality Criteria method for multiple behavior constraints.

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