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Civil-Comp Proceedings
ISSN 1759-3433
CCP: 25
Edited by: B.H.V. Topping and M. Papadrakakis
Paper IV.5

Topological Optimization of Rotorcraft Subfloor Structures for Crashworthiness Considerations

P. Hajela and E. Lee

Department of Mechanical Engineering, Aeronautical Engineering and Mechanics, Rensselaer Polytechnic Institute, Troy, New York, United States of America

Full Bibliographic Reference for this paper
P. Hajela, E. Lee, "Topological Optimization of Rotorcraft Subfloor Structures for Crashworthiness Considerations", in B.H.V. Topping, M. Papadrakakis, (Editors), "Advances in Structural Optimization", Civil-Comp Press, Edinburgh, UK, pp 131-142, 1994. doi:10.4203/ccp.25.4.5
The present paper discusses significant design issues in the sizing of rotorcraft structures for requirements of enhanced crash performance. The focus of the study is on topological design of the subfloor structure, defined as a crush zone under a more rigid floor structure. The topological design problem includes both an appropriate selection of an energy absorbing material (tailored load-deflection curve), and placement of this material at discrete locations under the main floor structure. A genetic algorithm based optimization approach was used in conjunction with a crash response analysis code (KRASH), which uses lumped masses, linear and nonlinear beam elements, and nonlinear spring elements to model the primary and secondary structure. The analysis problem is computationally demanding, and to alleviate these costs, approximate response models based on a multilayer perceptron neural network were developed and used in the optimization studies.

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